CN112473345B - Gas generating system - Google Patents
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- CN112473345B CN112473345B CN202011147996.0A CN202011147996A CN112473345B CN 112473345 B CN112473345 B CN 112473345B CN 202011147996 A CN202011147996 A CN 202011147996A CN 112473345 B CN112473345 B CN 112473345B
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Abstract
The present invention provides a gas generation system comprising: the raw material gas generating equipment is used for processing air to obtain raw material gas; the target gas generation device is connected with the raw material gas generation device and is used for generating and outputting first gas by taking the raw material gas as a raw material; and the control device is connected with the target gas generation device and used for detecting and controlling the concentration of the first gas generated by the target gas generation device. The gas generation system of the invention generates standard ozone gas and tests the ozone detector.
Description
Technical Field
The invention relates to the technical field of ozone analyzer verification, in particular to a gas generation system.
Background
At present, the standard methods for measuring ozone mainly comprise two manual analysis methods, namely 'ambient air ozone measuring sodium indigo disulfonate spectrophotometry' (HJ504-2009) and 'ambient air ozone measuring ultraviolet photometry' (HJ590-2010), and the automatic monitoring method mainly comprises an ultraviolet fluorescence method and a differential absorption spectrum analysis method; an ozone analyzer was fabricated according to the above measurement and analysis method to measure the concentration of ozone, and the limit concentration of ozone acceptable to humans in one hour was 260 μ g/m3 against ozone, which is proposed by the international environmental air quality standards (NAAQS). A1 h activity in 320 ug/m 3 ozone environment resulted in cough, dyspnea and decreased lung function. Ozone can also participate in the reaction of unsaturated fatty acid, amino and other proteins in organisms, so that people who directly contact ozone for a long time have symptoms of fatigue, cough, chest distress and pain, skin wrinkling, nausea and headache, accelerated pulse, memory deterioration, visual deterioration and the like. When in use, the accuracy of the detection of the ozone analyzer is directly related to the accuracy of the ozone content in the air, so that the accuracy of the ozone analyzer is especially important.
Disclosure of Invention
One of the objectives of the present invention is to provide a gas generation system that generates standard ozone gas for calibrating an ozone detector.
The embodiment of the invention provides a gas generation system, which comprises:
the raw material gas generating equipment is used for processing air to obtain raw material gas;
the target gas generation device is connected with the raw material gas generation device and is used for generating and outputting first gas by taking the raw material gas as a raw material;
and the control device is connected with the target gas generation device and used for detecting and controlling the concentration of the first gas generated by the target gas generation device.
Preferably, the raw material gas generation apparatus includes: an air compressor and purifier;
the air compressor is connected with the purifier, and the purifier is connected with the target gas generation equipment;
the purifier is an ozone purification device.
Preferably, the control device is a PC computer.
Preferably, the target gas generation apparatus includes:
the air conditioner comprises a shell, wherein an air inlet, an output port, an air outlet, a first exhaust port and a second exhaust port are formed in the shell; a second pressure reducing valve is connected between the first exhaust port and the air inlet;
the ozone generator is arranged in the shell and is connected with the air inlet through a first pressure reducing valve;
the detection control module is arranged in the shell and is connected with the air outlet through the air pump; the detection control module is also connected with the first exhaust port; the detection control module is electrically connected with the ozone generator;
the manifold is arranged in the shell and comprises a first air inlet end and three first air outlet ends, the first air inlet end is connected with the ozone generator, and the three first air outlet ends are respectively connected with the output port, the second air outlet and the detection control module;
the detection control module is in communication connection with the control equipment.
Preferably, the gas generating system further comprises:
the first float flowmeter is connected with the first exhaust port and used for detecting the flow of the raw material gas generating equipment connected to the air inlet;
and the second float flowmeter is connected with the second exhaust port and is used for detecting the output flow of the output port.
Preferably, the target gas generation apparatus further comprises:
the buffer device is arranged in the shell, the ozone generator is connected with an air inlet end of the manifold through the buffer device,
the cache device includes: the air purifier comprises a body, wherein a second air inlet end, a third air inlet end and a second air outlet end are arranged on the body; the second air outlet end is connected with the first air inlet end; the second air inlet end is connected with an ozone generator, and the third air inlet end is connected with raw material gas generation equipment; the tail end of the second air inlet end positioned in the body and the tail end of the third air inlet end positioned in the body are arranged oppositely.
Preferably, the cache apparatus further includes:
the buffer memory mechanism is arranged in the buffer memory cavity; one side of the cache mechanism is communicated with the tail ends of the two second air inlet ends positioned in the body;
the gas temporary storage cavity is communicated with one side of the buffer mechanism, which is far away from the second gas inlet end; the gas temporary storage cavity is also communicated with the second gas outlet end;
the buffer memory mechanism includes:
the rotating shaft is rotatably arranged in the cache cavity; the rotating shaft is matched with the cache cavity in size, and a plurality of accommodating grooves are formed in the periphery of the rotating shaft;
the plurality of gas pushing units are arranged in the plurality of accommodating grooves in a one-to-one correspondence manner;
the gas pushing unit includes:
the surface of the push plate is arc-shaped, and the diameter of a circle where the arc is positioned is the same as that of the rotating shaft; the size of the push plate is matched with that of the accommodating groove;
the base is arranged between the push plate and the accommodating groove and is fixedly connected with the push plate;
the two parallel closed guide rails are arranged on the side wall of the cache cavity;
the guide cylinder penetrates through the base and is rotatably connected with the base; two ends of the guide post body are respectively arranged in the two closed guide rails; the guide post body slides in the closed guide rail;
the spring is arranged between the base and the groove bottom of the accommodating groove, one end of the spring is fixedly connected with the base, and the other end of the spring is fixedly connected with the groove bottom;
the closure rail comprises: a first semi-circle part, a parallel part and a second semi-circle part which are connected in sequence to form a closed structure; the center of the first semicircular part coincides with the center of the rotating shaft.
Preferably, the target gas generation apparatus further comprises:
the first electric control valve is arranged between the first pressure reducing valve and the ozone generator and is used for controlling the on-off of the raw material gas entering the ozone generator;
the first flow sensor is arranged between the first electric control valve and the ozone generator and used for detecting the first flow of the raw material gas entering the ozone generator;
the second electric control valve is arranged between the ozone generator and the second air inlet end of the cache device and is used for controlling the on-off of the first gas generated by the ozone generator entering the cache device;
the second flow sensor is arranged between the ozone generator and a second air inlet end of the cache device and used for detecting a second flow of the first gas entering the cache device;
the third electric control valve is arranged between the ozone generator and the manifold and used for controlling the on-off of a pipeline between the ozone generator and the manifold;
the fourth electric control valve is arranged between the manifold and the output port and used for controlling the on-off of the first gas output by the target gas generation equipment;
the third flow sensor is arranged between the manifold and the output port and used for detecting a third flow of the first gas output by the target gas generation equipment;
the fifth electric control valve is arranged between the manifold and the detection control module and is used for controlling the on-off of the first gas input into the detection control module by the manifold;
the sixth electric control valve is arranged between the ozone generator and the detection control module and is used for controlling the on-off of the first gas input into the detection control module by the ozone generator;
the seventh electric control valve is arranged between the air inlet and the third air inlet end of the cache device and is used for controlling the on-off of the raw material gas entering the cache device;
the fourth flow sensor is arranged between the air inlet and the third air inlet end of the cache device and used for detecting the fourth flow of the raw material gas entering the cache device;
the detection control module comprises: a first detection mechanism for detecting a first concentration of ozone in the first gas output by the manifold; a second detection mechanism for detecting a second concentration of ozone in the first gas of the ozone generator;
the controller is respectively connected with the first detection mechanism, the second detection mechanism, the first electric control valve, the second electric control valve, the third electric control valve, the fourth electric control valve, the fifth electric control valve, the sixth electric control valve, the first flow sensor, the second flow sensor and the third flow sensor;
the controller performs the following operations:
when the machine is started, the ozone generator is controlled to be started for preheating; after preheating of the ozone generator is completed, controlling a first electric control valve to be opened to a first preset opening degree, controlling a second electric control valve to be closed, controlling a third electric control valve to be opened, controlling a fifth electric control valve to be opened, controlling a sixth electric control valve to be closed and controlling a seventh electric control valve to be closed; enabling the raw material gas to enter an ozone generator to react to generate a first gas;
detecting a first concentration by a first detection mechanism;
acquiring a first target concentration sent by control equipment;
comparing the first concentration to a first target concentration; when the first concentration is equal to the first target concentration, no action is taken;
when the first concentration is less than the first target concentration, increasing the power of the ozone generator;
when the first concentration is greater than the first target concentration, reducing the power of the ozone generator; the power of the ozone generator is reduced, and meanwhile, the third electric control valve is controlled to be closed, the second electric control valve is controlled to be opened, and the seventh electric control valve is controlled to be opened; controlling the opening degrees of a second electric control valve and a seventh electric control valve based on the second concentration, the first target concentration, the second flow and the fourth flow to enable the first concentration to reach the first target concentration; gradually closing the seventh electrically controlled valve along with the reduction of the power of the ozone generator; and when the seventh electric control valve is closed, controlling the second electric control valve to be closed and simultaneously opening the third electric control valve.
Preferably, the controlling the opening degrees of the second electrically-controlled valve and the seventh electrically-controlled valve based on the second concentration, the first target concentration, the second flow rate, and the fourth flow rate includes:
detecting the second concentration through a second detection mechanism, acquiring a first measured value of the currently detected second concentration, and verifying the validity of the current measured value based on the second concentration measured value detected in history when the difference value between the first measured value and the measured value at the previous moment exceeds a preset threshold value; correcting the first measured value; the correction formula is as follows:
wherein, OtThe current first measurement value is the first measurement value at the time t; o ist-1The measured value at the last moment is the measured value at the t-1 moment; o ist-iThe measured value at the previous i moment is the measured value at the t-i moment; o ist-i-1The measured value at the previous i +1 moment is the measured value at the t-i-1 moment; n is the number of preset extracted historical data; alpha and beta are preset correction weights;
verifying the validity of the current measurement based on the historically detected measurement of the second concentration, comprising:
extracting the measured values of the second concentration of the M +1 times of historical detection to make M +1 verification sets; the M +1 verification sets respectively extract N, N +1, … and N + M measured values of historical detection;
respectively calculating the average value of the measured values in each verification set; and calculating a stable value of the first measurement value according to the average value and the first measurement value, wherein the calculation formula is as follows:
wherein μ is a stable value, XN+jAverage of the measurements in the (N + j) th validation set; when the mu is less than or equal to a preset stable threshold value, the verification is passed; otherwise, fail;
and substituting the verified or corrected second concentration into the following formula to determine a target value of the second flow rate:
wherein Q is2A target value for the second flow rate; qGeneral assemblyIs a preset total amount of gas; p1Is a first concentration; p2The second concentration after passing the verification or correction;
determining a target value of a fourth flow according to the preset total gas amount and the target value of the second flow;
when the second flow and the target value of the second flow are equal, controlling the opening of the second electric control valve to be kept unchanged; when the second flow is larger than the target value of the second flow, controlling the opening of the second electric control valve to be reduced; when the second flow is smaller than the target value of the second flow, controlling the opening of the second electric control valve to increase;
when the target values of the fourth flow and the fourth flow are equal, controlling the opening of the seventh electrically controlled valve to be kept unchanged; when the fourth flow is larger than the target value of the fourth flow, controlling the opening of the seventh electric control valve to be reduced; and when the fourth flow is smaller than the target value of the fourth flow, controlling the opening of the seventh electrically controlled valve to increase.
Preferably, the target gas generation apparatus further comprises:
the cooling mechanism is used for cooling the first gas generated by the ozone generator;
the cooling mechanism includes:
and the cooling pipeline is spirally arranged on a pipeline which is connected with the ozone generator and the manifold and/or a pipeline which is connected with the manifold and the detection control module and/or a pipeline which is connected with the output port of the manifold.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a gas generation system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a front panel of a target gas generation apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a back plate of a target gas generation device in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view showing the connection of the internal components of a target gas generating apparatus according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a cache apparatus according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a caching mechanism according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a base in an embodiment of the invention;
FIG. 8 is a schematic view of a combination of a closure rail according to an embodiment of the present invention;
FIG. 9 is an exploded view of a closure rail according to an embodiment of the present invention;
fig. 10 is a schematic control diagram of a target gas generation apparatus according to an embodiment of the present invention.
In the figure:
1. a raw material gas generation device; 2. a target gas generation device; 3. a control device; 11. a body; 12. a second air inlet end; 13. a third air inlet end; 14. a gas temporary storage cavity; 15. a second air outlet end; 16. a caching mechanism; 21. an accommodating recess; 22. pushing the plate; 23. a rotating shaft; 24. a base; 25. a guide cylinder; 26. closing the guide rail; 27. a spring; 28. a cache cavity; 30. a controller; 31. a first electrically controlled valve; 32. a second electrically controlled valve; 33. a third electrically controlled valve; 34. a fourth electrically controlled valve; 35. a fifth electrically controlled valve; 36. a sixth electrically controlled valve; 37. a seventh electrically controlled valve; 41. a first flow sensor; 42. a second flow sensor; 43. a third flow sensor; 44. a fourth flow sensor; 51. a first detection mechanism; 52. a second detection mechanism; 61. a housing; 62. an output port; 63. a second exhaust port; 64. a second float flow meter; 4. an air compressor; 5. a purifier; 65. an air inlet; 66. a first exhaust port; 67. a first float flow meter; 68. an air outlet; 69. a first pressure reducing valve; 70. a second pressure reducing valve; 71. a manifold; 72. an ozone generator; 73. a detection control module; 74. an air pump; 26-1, a first semicircular portion; 26-2, parallel portion; 26-3, second semi-circular portion.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
An embodiment of the present invention provides a gas generation system, as shown in fig. 1, including:
a raw material gas generation device 1 for processing air to obtain raw material gas;
a target gas generation device 2 connected to the raw material gas generation device 1, for generating and outputting a first gas using the raw material gas as a raw material;
and a control device 3 connected to the target gas generation device 2 for detecting and controlling the concentration of the first gas generated by the target gas generation device 2.
The working principle and the beneficial effects of the technical scheme are as follows:
the gas generating system generates standard gas, so that the raw material gas for generating the standard gas needs to be strictly controlled, and the standard gas can be used as the standard gas to achieve the standard effect; air is generally adopted to obtain raw material gas after being treated by raw material gas generating equipment 1; for the verification of an ozone analyzer, the gas obtained by passing air through an ozone purification apparatus is used as a raw material gas, and is also referred to as zero air, that is, air containing zero ozone. The oxygen content in the air is only 21 percent, and the content of the first gas generated by the raw material gas made of the air can meet the verification of an oxygen analyzer with ppb level; pure oxygen can be adopted to generate raw material gas after passing through the ozone purification device to generate first gas, and the ozone content in the first gas is higher than that of the first gas generated by using air, so that the ozone purification device can be widely applied; when the first gas made of pure oxygen is used, an exhaust system of a working space needs to work perfectly, and the damage of overhigh ozone concentration to a human body is prevented. The control device 3 is used by a worker and is used for operating and controlling the operation of the target gas generation device 2, regulating and controlling the ozone concentration in the first gas generated by the target gas generation device 2, and realizing that the ozone concentration of the standard gas is adjustable.
The gas generation system adopts the control equipment 3 to control the target gas generation equipment 2 to generate standard ozone gas with different ozone concentrations, and carries out multi-point verification on the ozone detector, thereby ensuring the accuracy of the ozone analyzer in detecting the ozone concentration.
In one embodiment, the raw material gas generation apparatus 1 includes: an air compressor 4 and a purifier 5;
the air compressor 4 is connected with the purifier 5, and the purifier 5 is connected with the target gas generation device 2;
the purifier 5 is an ozone purifying device.
The working principle and the beneficial effects of the technical scheme are as follows:
the air compressor 4 compresses air or oxygen to provide power for conveying gas in the system; the ozone purifier 5 purifies air or oxygen, removes ozone residue, and obtains zero air. Further, air or oxygen may be subjected to a dehumidification operation or the like.
In one embodiment, the control device 3 is a PC computer.
The working principle and the beneficial effects of the technical scheme are as follows:
a user can set and debug the parameters of the target gas generation equipment 2 through a PC computer; and controls the concentration of ozone generated by the target gas generating apparatus 2; and the ozone concentration of the first gas generated by the target gas generation device 2 can be monitored in real time and the real-time monitoring data can be stored.
In one embodiment, as shown in fig. 2 to 4, the target gas generation device 2 includes:
a casing 61, in which an inlet 65, an outlet 62, an outlet 68, a first exhaust port 66, and a second exhaust port 63 are provided in the casing 61; a second pressure reducing valve 70 is connected between the first exhaust port 66 and the intake port 65;
an ozone generator 72 provided in the housing 61 and connected to the air inlet 65 through a first pressure reducing valve 69;
a detection control module 73 arranged in the housing 61 and connected with the air outlet 68 through an air pump 74; the detection control module 73 is also connected to the first exhaust port 66; the detection control module 73 is electrically connected with the ozone generator 72;
the manifold 71 is arranged in the shell 61, the manifold 71 comprises a first air inlet end and three first air outlet ends, the first air inlet end is connected with the ozone generator 72, and the three first air outlet ends are respectively connected with the output port 62, the second air outlet 63 and the detection control module 73;
the detection control module 73 is in communication connection with the control device 3.
The working principle and the beneficial effects of the technical scheme are as follows:
the air inlet 65 on the shell 61 is a zero air inlet, is connected with the raw material gas generated by the raw material gas generating equipment 1, is connected with the air compressor 4 of the ozone purifying device, and has the flow rate more than or equal to 8L/min; the output port 62 outputs the first gas to a calibrated ozone analyzer, the flow rate of the output port 62 needs to be controlled, and the first exhaust port 66 is used for exhausting redundant zero air or detecting whether an internal pipeline is blocked; the first exhaust port 66 and the ozone generator 72 share the zero air flow of the air inlet 65 together, so that the flow of the ozone generator 72 is adjustable; in addition, according to the calibration rule of the ozone analyzer, when the zero point of the ozone analyzer is calibrated, zero air of the same air source as that of the equipment used for calibration needs to be adopted, and the zero air output from the first exhaust port 66 can meet the use requirement of the zero point calibration of the calibrated ozone analyzer; when in use, an 'ozone output' interface (an output port 62) of the front panel is connected to an inlet of a calibrated instrument by a phi 6 polytetrafluoroethylene tube, and a plug of an 'exhaust port' is opened; if the detected instrument does not suck sample gas by a sampling pump, the exhaust port is sealed, and the ozone output gas is output to an open container and passes through a probe of the calibrated instrument; the detection control module 73 includes: the ozone standard reference photometer is based on the principle that ozone has obvious absorption on ultraviolet rays with specific wavelength of 253.7nm, adopts an ultraviolet double-optical-path detection technology, and can be used as a measuring reference instrument for monitoring ozone.
In this embodiment, the generation path of the first gas is: raw material gas enters the ozone generator 72 through the gas inlet 65, and after an ozone lamp in the ozone generator 72 is electrified, a high-voltage electric field is formed for discharging to enable oxygen in the air to be ionized into negative ions, namely ozone, which are respectively input into the detection control module 73, the output port 62 and the second gas outlet 63 through the manifold 71 for output; the detection control module 73 detects the concentration of ozone in the first gas output from the ozone generator 72, and controls the power of the ozone generator 72, the flow rate of the raw gas entering the ozone generator 72, and the like to adjust the concentration of ozone in the output first gas when the concentration of ozone does not meet the requirement. The gas outlet 68 is connected with the detection control system, a gas pump 74 is connected in the middle, the gas pump 74 provides power for gas circulation in the gas path, and first gas for detecting the ozone concentration by the detection control system is discharged from the gas outlet 68. A first pressure reducing valve 69 is provided at the front end of the ozone generator 72 for protecting the ozone generator 72 to balance and stabilize the pressure of the raw material gas in the gas inlet 65; the second exhaust port 63 shares the flow rate of the gas output from the output port 62 for verification, and protects the verified ozone analyzer.
In one embodiment, the gas generation system further comprises:
a first float flow meter 67 connected to the first exhaust port 66 for detecting the flow rate of the raw material gas production apparatus 1 connected to the intake port 65;
and a second float flow meter 64 connected to the second exhaust port 63 for detecting the output flow rate of the output port 62.
The working principle and the beneficial effects of the technical scheme are as follows:
checking the reading of a flowmeter on the front panel to see whether the reading is stabilized at about 1.0L/min, and if not, checking whether an internal gas path is blocked; and checking whether the zero air introduced by the compressor has enough flow by connecting a float flowmeter at the exhaust port of the rear panel, wherein the flow indication is more than 200 mL. Otherwise, the pressure of the air compressor 4 needs to be adjusted; whether the output flow of the ozone has enough flow is checked, the checking method is that a float flowmeter is connected to an exhaust port of a front panel, the flow indication is more than 200mL, otherwise, the pressure of the air compressor 4 needs to be adjusted or a pressure stabilizing valve in a case needs to be adjusted. The flow meter of the front panel is a flow meter for detecting the output port 62, and the intake amount of the tested ozone analyzer is required to be less than 1L during verification.
In one embodiment, as shown in fig. 5 to 9, the target gas generation apparatus 2 further includes:
a buffer device arranged in the shell 61, an ozone generator 72 connected with an air inlet end of the manifold 71 through the buffer device,
the cache device includes: the gas-liquid separator comprises a body 11, wherein a second gas inlet end 12, a third gas inlet end 13 and a second gas outlet end 15 are arranged on the body 11; the second air outlet end 15 is connected with the first air inlet end; the second air inlet end 12 is connected with the ozone generator 72, and the third air inlet end 13 is connected with the raw material gas generating equipment 1; the end of the second air inlet end 12 located inside the body 11 is opposite to the end of the third air inlet end 13 located inside the body 11.
The working principle and the beneficial effects of the technical scheme are as follows:
the method needs to perform multi-point detection during detection, for example, five detection points are selected, namely zero point, 50ppb, 100ppb, 150ppb and 200 ppb; when the target gas generation equipment 2 is adjusted from 100ppb to 50ppb, the adjustment is too slow only by adjusting the power of the ozone generator 72 and the input airflow, and the high-concentration first gas and the zero air are directly matched through the buffer device, so that the quick output is realized, and the response time of the system is reduced; the working efficiency of verification is improved. When the proportioning is carried out, the second air inlet end 12 and the third air inlet end 13 in the buffer device are arranged oppositely, so that the high-concentration first air and zero air are flushed, and the mixing efficiency is improved.
In one embodiment, the caching apparatus further comprises:
a buffer mechanism 16 disposed in the buffer chamber 28; one side of the cache mechanism 16 is communicated with the tail ends of the two second air inlet ends 12 in the body 11;
the gas temporary storage cavity 14 is communicated with one side of the buffer mechanism 16 far away from the second air inlet end 12; the gas temporary storage cavity 14 is also communicated with a second gas outlet end 15;
the buffer mechanism 16 includes:
the rotating shaft 23 is rotatably arranged in the cache cavity 28; the rotating shaft 23 is matched with the buffer cavity 28 in size, and a plurality of accommodating grooves 21 are formed in the periphery of the rotating shaft 23;
the plurality of gas pushing units are arranged in the plurality of accommodating grooves 21 in a one-to-one correspondence manner;
the gas pushing unit includes:
the surface of the push plate 22 is arc-shaped, and the diameter of a circle where the arc is positioned is the same as that of the rotating shaft 23; the size of the push plate 22 is matched with that of the accommodating groove 21;
the base 24 is arranged between the push plate 22 and the accommodating groove 21 and fixedly connected with the push plate 22;
two parallel closed guide rails 26 arranged on the side walls of the buffer cavity 28;
a guide post 25 which is arranged through the base 24 and is rotatably connected with the base 24; the two ends of the guide column body 25 are respectively arranged in the two closed guide rails 26; the guide cylinder 25 slides inside the closing guide 26;
the spring 27 is arranged between the base 24 and the bottom of the accommodating groove 21, one end of the spring is fixedly connected with the base 24, and the other end of the spring is fixedly connected with the bottom of the groove;
the closure rail 26 includes: a first semicircular part 26-1, a parallel part 26-2 and a second semicircular part 26-3 which are connected in sequence to form a closed structure; the center of the first semicircular portion 26-1 coincides with the center of the rotation shaft 23.
The working principle and the beneficial effects of the technical scheme are as follows:
each accommodating groove 21 is mutually independent to form an independent closed space, and when the rotating shaft 23 rotates, the second air outlet end 15 and the third air outlet end are respectively matched into the independent closed spaces, because when the target gas generating equipment 2 is adjusted from 100ppb to 50ppb, the concentration of the high-concentration first gas for matching is gradually reduced and approaches to the target concentration by adjusting the power and the input airflow of the ozone generator 72, the sectional matching is required to be carried out, and the volumes of the added zero air for matching in each section are different; therefore, the accommodating groove 21 of the rotating shaft 23 in the embodiment provides an independent closed space for proportioning to use; when the accommodating groove 21 rotates to one side of the temporary gas storage cavity 14 along with the rotating shaft 23, the push plate 22 moves to the opening of the accommodating groove 21 under the pushing of the spring 27, and the gas mixture in the accommodating groove 21 is completely conveyed into the temporary gas storage cavity 14, so that the gas in the accommodating groove 21 is completely emptied, and the accuracy of the next mixture in the accommodating groove 21 is not influenced; when the accommodating groove 21 moves from the temporary gas storage cavity 14 to the second gas outlet end 15 and the third gas outlet end along with the rotation of the rotating shaft 23, the guide pillar body 25 slides in the closed guide rail 26 to move the push plate 22 backwards; the space in the accommodating groove 21 is left for proportioning; after the matching is completed, when the accommodating groove 21 moves to the side of the temporary gas storage cavity 14 from the second gas outlet end 15 and the third gas outlet end along with the rotation of the rotating shaft 23, the position of the push plate 22 in the accommodating groove 21 is relatively unchanged, the parameters of the volume and the like of the gas after the matching are ensured to be unchanged, and no adverse effect is generated on the gas to be matched.
In one embodiment, as shown in fig. 10, the target gas generation apparatus 2 further includes:
the first electric control valve 31 is arranged between the first pressure reducing valve 69 and the ozone generator 72 and is used for controlling the on-off of the raw material gas entering the ozone generator 72;
a first flow sensor 41 disposed between the first electrically controlled valve 31 and the ozone generator 72, for detecting a first flow rate of the raw gas entering the ozone generator 72;
the second electrically controlled valve 32 is arranged between the ozone generator 72 and the second air inlet end 12 of the buffer device and is used for controlling the on-off of the first gas generated by the ozone generator 72 entering the buffer device;
a second flow sensor 42 disposed between the ozone generator 72 and the second inlet end 12 of the buffer device for detecting a second flow of the first gas into the buffer device;
the third electrically controlled valve 33 is arranged between the ozone generator 72 and the manifold 71 and is used for controlling the on-off of a pipeline between the ozone generator 72 and the manifold 71;
the fourth electrically controlled valve 34 is arranged between the manifold 71 and the output port 62 and is used for controlling the on-off of the first gas output by the target gas generation equipment 2;
a third flow sensor 43 provided between the manifold 71 and the output port 62, for detecting a third flow rate of the first gas output from the target gas generating apparatus 2;
the fifth electric control valve 35 is arranged between the manifold 71 and the detection control module 73 and is used for controlling the on-off of the first gas input into the detection control module 73 by the manifold 71;
the sixth electronic control valve 36 is arranged between the ozone generator 72 and the detection control module 73 and is used for controlling the on-off of the first gas input into the detection control module 73 by the ozone generator 72;
the seventh electric control valve 37 is arranged between the air inlet 65 and the third air inlet end 13 of the buffer device and is used for controlling the on-off of the raw material gas entering the buffer device;
a fourth flow sensor 44, disposed between the gas inlet 65 and the third gas inlet 13 of the buffer device, for detecting a fourth flow of the raw material gas into the buffer device;
the detection control module 73 includes: a first detection mechanism 51 for detecting a first concentration of ozone in the first gas output from the manifold 71; a second detection mechanism 52 for detecting a second concentration of ozone in the first gas of the ozone generator 72;
the controller 30 is respectively connected with the first detection mechanism 51, the second detection mechanism 52, the first electronic control valve 31, the second electronic control valve 32, the third electronic control valve 33, the fourth electronic control valve 34, the fifth electronic control valve 35, the sixth electronic control valve 36, the first flow sensor 41, the second flow sensor 42 and the third flow sensor 43;
the controller 30 performs the following operations:
when the machine is started, the ozone generator 72 is controlled to be started for preheating; after the ozone generator 72 finishes preheating, controlling the first electric control valve to be opened to a first preset opening degree, controlling the second electric control valve 32 to be closed, controlling the third electric control valve 33 to be opened, controlling the fifth electric control valve 35 to be opened, controlling the sixth electric control valve 36 to be closed, and controlling the seventh electric control valve 37 to be closed; the raw material gas enters an ozone generator 72 to react to generate a first gas;
the first density is detected by the first detection mechanism 51;
acquiring a first target concentration sent by the control equipment 3;
comparing the first concentration to a first target concentration; when the first concentration is equal to the first target concentration, no action is taken;
increasing the power of the ozone generator 72 when the first concentration is less than the first target concentration;
when the first concentration is greater than the first target concentration, reducing the power of the ozone generator 72; the power of the ozone generator 72 is reduced, and simultaneously the third electric control valve 33 is controlled to be closed, the second electric control valve 32 is controlled to be opened, and the seventh electric control valve 37 is controlled to be opened; controlling the opening degrees of the second electrically-controlled valve 32 and the seventh electrically-controlled valve 37 based on the second concentration, the first target concentration, the second flow rate and the fourth flow rate to make the first concentration reach the first target concentration; gradually closing the seventh electrically controlled valve 37 as the power of the ozone generator 72 decreases; when the seventh electrically controlled valve 37 is closed, the second electrically controlled valve 32 is controlled to close while the third electrically controlled valve 33 is opened.
The working principle and the beneficial effects of the technical scheme are as follows:
the controller 30 of the detection control module 73 realizes comprehensive automatic control over the target gas generation device 2 through the first detection mechanism 51, the second detection mechanism 52, the first electric control valve 31, the second electric control valve 32, the third electric control valve 33, the fourth electric control valve 34, the fifth electric control valve 35, the sixth electric control valve 36, the first flow sensor 41, the second flow sensor 42 and the third flow sensor 43, and improves automation of operation of the target gas generation device 2; in addition, the first detection mechanism 51 and the second detection mechanism 52 detect the first concentration and the second concentration, so as to provide a detection data base for a proportioning environment for concentration conversion of standard gas during verification and ensure correct proportioning.
In one embodiment, controlling the opening degrees of the second and seventh electronically controlled valves 32, 37 based on the second concentration, the first target concentration, the second flow rate, and the fourth flow rate includes:
detecting the second concentration by the second detecting mechanism 52, obtaining a first measured value of the currently detected second concentration, and when a difference value between the first measured value and a measured value at the previous moment exceeds a preset threshold value, and/or verifying validity of a current measured value based on the historically detected second concentration measured value, if the verification fails; correcting the first measured value; the correction formula is as follows:
wherein, OtThe current first measurement value is the first measurement value at the time t; o ist-1The measured value at the last moment is the measured value at the t-1 moment; o ist-iThe measured value at the previous i moment is the measured value at the t-i moment; o ist-i-1The measured value at the previous i +1 moment is the measured value at the t-i-1 moment; n is the number of preset extracted historical data; alpha and beta are preset correction weights;
verifying the validity of the current measurement based on the historically detected measurement of the second concentration, comprising:
extracting the measured values of the second concentration of the M +1 times of historical detection to make M +1 verification sets; the M +1 verification sets respectively extract N, N +1, … and N + M measured values of historical detection;
respectively calculating the average value of the measured values in each verification set; and calculating a stable value of the first measurement value according to the average value and the first measurement value, wherein the calculation formula is as follows:
wherein μ is a stable value, XN+jAverage of the measurements in the (N + j) th validation set; when the mu is less than or equal to a preset stable threshold value, the verification is passed; otherwise, fail;
and substituting the verified or corrected second concentration into the following formula to determine a target value of the second flow rate:
wherein Q is2A target value for the second flow rate; qGeneral assemblyIs a preset total amount of gas; p1Is a first concentration; p2The second concentration after passing the verification or correction;
determining a target value of a fourth flow according to the preset total gas amount and the target value of the second flow;
when the second flow rate is equal to the target value of the second flow rate, controlling the opening degree of the second electrically controlled valve 32 to be kept unchanged; when the second flow rate is larger than the target value of the second flow rate, controlling the opening degree of the second electrically controlled valve 32 to be reduced; when the second flow rate is smaller than the target value of the second flow rate, controlling the opening degree of the second electrically controlled valve 32 to increase;
when the target values of the fourth flow and the fourth flow are equal, controlling the opening degree of the seventh electrically controlled valve 37 to be kept unchanged; when the fourth flow rate is larger than the target value of the fourth flow rate, controlling the opening degree of the seventh electrically controlled valve 37 to be reduced; when the fourth flow rate is smaller than the target value of the fourth flow rate, the opening degree of the seventh electrically controlled valve 37 is controlled to be increased.
The working principle and the beneficial effects of the technical scheme are as follows:
the accuracy of the detection of the second concentration and the first concentration is directly related to the accuracy of the proportioning and the verification; therefore, in the continuous detection, the validity of the currently detected value needs to be verified and the difference value between the currently detected value and the measured value at the previous moment needs to be judged, and when the verification fails or exceeds a preset threshold value, the currently measured value needs to be corrected; and correcting the measured value at the moment mainly as a standard, and predicting the measured value at the current moment based on the trend and the numerical value of the historical detection data. Then, the volumes of the two gases are calculated and matched based on the first concentration and the second concentration, and the adjustment of the second electric control valve 32 and the seventh electric control valve 37 is determined according to the volumes and the numerical value of the current flow sensor; thereby realizing reasonable and effective proportioning; the mixture ratio can be segmented by combining the volume of the accommodating groove 21, and the volume of the accommodating groove 21 is the preset total gas amount; and realizing accurate sectional proportioning.
In one embodiment, the target gas generation apparatus 2 further includes:
a cooling mechanism for cooling the first gas generated by the ozone generator 72;
the cooling mechanism includes:
and the cooling pipeline is spirally arranged on a pipeline for connecting the ozone generator 72 with the manifold 71 and/or a pipeline for connecting the manifold 71 with the detection control module 73 and/or a pipeline for connecting the manifold 71 with the output port 62.
The working principle and the beneficial effects of the technical scheme are as follows:
ozone begins to decompose slowly when being generated, and the decomposition is faster when the temperature is higher; therefore, after the ozone generator 72 generates ozone, the generated gas needs to be cooled down, so that the decomposition is delayed; the accuracy of the verification is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A gas generation system, comprising:
the raw material gas generating equipment (1) is used for processing air to obtain raw material gas;
the target gas generation device (2) is connected with the raw material gas generation device (1) and is used for generating and outputting first gas by taking the raw material gas as a raw material;
a control device (3) connected to the target gas generation device (2) for detecting and controlling the concentration of the first gas generated by the target gas generation device (2);
the target gas generation device (2) includes:
a housing (61), wherein the housing (61) is provided with an air inlet (65), an output port (62), an air outlet (68), a first exhaust port (66) and a second exhaust port (63); a second pressure reducing valve (70) is connected between the first exhaust port (66) and the air inlet (65);
an ozone generator (72) disposed in the housing (61) and connected to the air inlet (65) through a first pressure reducing valve (69);
the detection control module (73) is arranged in the shell (61) and is connected with the air outlet (68) through an air pump (74); the detection control module (73) is also connected with the first exhaust port (66); the detection control module (73) is electrically connected with the ozone generator (72);
the manifold (71) is arranged in the shell (61), the manifold (71) comprises a first air inlet end and three first air outlet ends, the first air inlet end is connected with the ozone generator (72), and the three first air outlet ends are respectively connected with the output port (62), the second exhaust port (63) and the detection control module (73);
the detection control module (73) is in communication connection with the control equipment (3);
the target gas generation apparatus (2) further includes:
a buffer device arranged in the shell (61), wherein the ozone generator (72) is connected with the air inlet end of the manifold (71) through the buffer device,
the cache device comprises: the air conditioner comprises a body (11), wherein a second air inlet end (12), a third air inlet end (13) and a second air outlet end (15) are arranged on the body (11); the second air outlet end (15) is connected with the first air inlet end; the second air inlet end (12) is connected with the ozone generator (72), and the third air inlet end (13) is connected with the raw material gas generation equipment (1); the tail end of the second air inlet end (12) located in the body (11) is opposite to the tail end of the third air inlet end (13) located in the body (11).
2. The gas generation system according to claim 1, wherein the raw gas generation device (1) includes: an air compressor (4) and a purifier (5);
the air compressor (4) is connected with the purifier (5), and the purifier (5) is connected with the target gas generation equipment (2);
the purifier (5) is an ozone purification device.
3. A gas generating system according to claim 1, characterised in that the control device (3) is a PC computer.
4. The gas generation system of claim 1, further comprising:
a first float flow meter (67) connected to the first exhaust port (66) for detecting a flow rate of the raw material gas generation device (1) connected to the intake port (65);
and the second float flowmeter (64) is connected with the second exhaust port (63) and is used for detecting the output flow of the output port (62).
5. The gas generation system of claim 1, wherein the buffer device further comprises:
a buffer mechanism (16) arranged in the buffer cavity (28); one side of the buffer mechanism (16) is communicated with the tail ends of the two second air inlet ends (12) in the body (11);
the temporary gas storage cavity (14) is communicated with one side of the buffer mechanism (16) far away from the second gas inlet end (12); the gas temporary storage cavity (14) is also communicated with the second gas outlet end (15);
the buffer mechanism (16) comprises:
the rotating shaft (23) is rotatably arranged in the buffer cavity (28); the rotating shaft (23) is matched with the buffer cavity (28) in size, and a plurality of accommodating grooves (21) are formed in the periphery of the rotating shaft (23);
the gas pushing units are arranged in the accommodating grooves (21) in a one-to-one correspondence manner;
the gas pushing unit includes:
the surface of the push plate (22) is arc-shaped, and the diameter of a circle where the arc is located is the same as that of the rotating shaft (23); the size of the push plate (22) is matched with that of the accommodating groove (21);
the base (24) is arranged between the push plate (22) and the accommodating groove (21) and is fixedly connected with the push plate (22);
two parallel closed guide rails (26) arranged on the side wall of the buffer cavity (28);
the guide cylinder (25) penetrates through the base (24) and is rotatably connected with the base (24); two ends of the guide cylinder (25) are respectively arranged in the two closed guide rails (26); the guide cylinder (25) slides in the closing guide (26);
the spring (27) is arranged between the base (24) and the groove bottom of the accommodating groove (21), one end of the spring is fixedly connected with the base (24), and the other end of the spring is fixedly connected with the groove bottom;
the closure rail (26) comprises: a first semicircular part (26-1), a parallel part (26-2) and a second semicircular part (26-3) which are connected in sequence to form a closed structure; the center of the first semicircular part (26-1) coincides with the center of the rotating shaft (23).
6. The gas generation system according to any one of claims 1 to 5, wherein the target gas generation device (2) further includes:
the first electric control valve (31) is arranged between the first pressure reducing valve (69) and the ozone generator (72) and is used for controlling the on-off of the raw material gas entering the ozone generator (72);
a first flow sensor (41) disposed between the first electrically controlled valve (31) and the ozone generator (72) for detecting a first flow of the raw gas into the ozone generator (72);
the second electric control valve (32) is arranged between the ozone generator (72) and the second air inlet end (12) of the buffer device and is used for controlling the on-off of the first gas generated by the ozone generator (72) entering the buffer device;
a second flow sensor (42) disposed between the ozone generator (72) and the second inlet end (12) of the buffer device for detecting a second flow of the first gas into the buffer device;
the third electric control valve (33) is arranged between the ozone generator (72) and the manifold (71) and is used for controlling the on-off of a pipeline between the ozone generator (72) and the manifold (71);
the fourth electric control valve (34) is arranged between the manifold (71) and the output port (62) and is used for controlling the on-off of the first gas output by the target gas generation equipment (2);
a third flow sensor (43) disposed between the manifold (71) and the output port (62) for detecting a third flow of the first gas output by the target gas generation device (2);
the fifth electric control valve (35) is arranged between the manifold (71) and the detection control module (73) and is used for controlling the on-off of the first gas input into the detection control module (73) from the manifold (71);
the sixth electric control valve (36) is arranged between the ozone generator (72) and the detection control module (73) and is used for controlling the on-off of the first gas input into the detection control module (73) by the ozone generator (72);
the seventh electric control valve (37) is arranged between the air inlet (65) and the third air inlet end (13) of the buffer device and is used for controlling the on-off of the raw material gas entering the buffer device;
a fourth flow sensor (44) disposed between the gas inlet (65) and the third gas inlet end (13) of the buffer device, for detecting a fourth flow of the raw material gas into the buffer device;
the detection control module (73) includes: a first detection mechanism (51) for detecting a first concentration of ozone in the first gas output by the manifold (71); a second detection mechanism (52) for detecting a second concentration of ozone within the first gas of the ozone generator (72);
a controller (30) connected to the first detection mechanism (51), the second detection mechanism (52), the first electrically controlled valve (31), the second electrically controlled valve (32), the third electrically controlled valve (33), the fourth electrically controlled valve (34), the fifth electrically controlled valve (35), the sixth electrically controlled valve (36), the first flow sensor (41), the second flow sensor (42), and the third flow sensor (43), respectively;
the controller (30) performs the following operations:
when the machine is started, the ozone generator (72) is controlled to be started for preheating; after the ozone generator (72) is preheated, controlling the first electric control valve to be opened to a first preset opening degree, controlling the second electric control valve (32) to be closed, controlling the third electric control valve (33) to be opened, controlling the fifth electric control valve (35) to be opened, controlling the sixth electric control valve (36) to be closed, and controlling the seventh electric control valve (37) to be closed; reacting the feed gas into the ozone generator (72) to produce the first gas;
-detecting said first concentration by said first detection means (51);
acquiring a first target concentration sent by the control equipment (3);
comparing the first concentration to the first target concentration; when the first concentration is equal to the first target concentration, no action is taken;
increasing the power of the ozone generator (72) when the first concentration is less than the first target concentration;
reducing the power of the ozone generator (72) when the first concentration is greater than the first target concentration; controlling the third electrically controlled valve (33) to close, the second electrically controlled valve (32) to open, and the seventh electrically controlled valve (37) to open while reducing the power of the ozone generator (72); controlling the opening degrees of the second electrically controlled valve (32) and the seventh electrically controlled valve (37) based on the second concentration, the first target concentration, the second flow rate, and the fourth flow rate to bring the first concentration to the first target concentration; -gradually closing said seventh electrically controlled valve (37) as the power of said ozone generator (72) decreases; when the seventh electrically controlled valve (37) is closed, the second electrically controlled valve (32) is controlled to close while the third electrically controlled valve (33) is opened.
7. The gas generation system of claim 6, wherein said controlling the opening of said second electrically controlled valve (32) and said seventh electrically controlled valve (37) based on said second concentration, said first target concentration, said second flow rate, and said fourth flow rate comprises:
detecting the second concentration by the second detection mechanism (52), acquiring a first measured value of the currently detected second concentration, and verifying the validity of the currently detected first measured value of the second concentration based on the historically detected measured value of the second concentration when the difference between the first measured value and the measured value of the second concentration exceeds a preset threshold value and/or the verification fails; correcting the first measurement value; the correction formula is as follows:
wherein, OtThe current first measurement value is the first measurement value at the time t; o ist-1The measured value at the last moment is the measured value at the t-1 moment; o ist-iAs measured at the previous i-time instant, i.e.A measured value at time t-i; o ist-i-1The measured value at the previous i +1 moment is the measured value at the t-i-1 moment; n is the number of preset extracted historical data; alpha and beta are preset correction weights;
the verifying the validity of the current measurement value based on the historically detected measurement value of the second concentration includes:
extracting the measured values of the second concentration of the M +1 times of historical detection to make M +1 verification sets; the M +1 validation sets extract N, N +1, …, and N + M of the measurements of the historical detection, respectively;
respectively calculating the average value of the measured values in each verification set; calculating a stable value of the first measurement value according to the average value and the first measurement value, wherein the calculation formula is as follows:
wherein μ is a stable value, XN+j(iv) the average of the measurements in the N + j th of the verification sets; when the mu is less than or equal to a preset stable threshold value, the verification is passed; otherwise, fail;
substituting the second concentration after passing the verification or correction into the following formula to determine a target value of the second flow rate:
wherein Q is2Is a target value of the second flow rate; qGeneral assemblyIs a preset total amount of gas; p1Is the first concentration; p2The second concentration after passing the verification or correction;
determining a target value of the fourth flow according to a preset total gas amount and a target value of the second flow;
when the second flow rate is equal to the target value of the second flow rate, controlling the opening degree of the second electrically-controlled valve (32) to be kept unchanged; when the second flow rate is larger than the target value of the second flow rate, controlling the opening degree of the second electrically-controlled valve (32) to be reduced; when the second flow rate is smaller than the target value of the second flow rate, controlling the opening degree of the second electrically-controlled valve (32) to increase;
when the target values of the fourth flow and the fourth flow are equal, controlling the opening degree of the seventh electrically controlled valve (37) to be kept unchanged; when the fourth flow is larger than the target value of the fourth flow, controlling the opening of the seventh electric control valve (37) to be reduced; and when the fourth flow is smaller than the target value of the fourth flow, controlling the opening of the seventh electric control valve (37) to increase.
8. The gas generation system according to claim 1, wherein the target gas generation device (2) further comprises:
a cooling mechanism for cooling the first gas generated by the ozone generator (72);
the cooling mechanism includes:
and the cooling pipeline is spirally arranged on a pipeline connected with the manifold (71) of the ozone generator (72) and/or a pipeline connected with the detection control module (73) of the manifold (71) and/or a pipeline connected with the output port (62) of the manifold (71).
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