CN203422675U - Dynamic trace gas concentration distributing apparatus - Google Patents
Dynamic trace gas concentration distributing apparatus Download PDFInfo
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- CN203422675U CN203422675U CN201320447617.9U CN201320447617U CN203422675U CN 203422675 U CN203422675 U CN 203422675U CN 201320447617 U CN201320447617 U CN 201320447617U CN 203422675 U CN203422675 U CN 203422675U
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Abstract
The utility model discloses a dynamic trace gas concentration distributing apparatus. The apparatus comprise a multi-component gas circuit, a dilution gas circuit, a mixing cushion gas chamber and a control system. The multi-component gas circuit comprises one or more of a component gas circuit 1 and a component gas circuit; the component gas circuit 1 comprises a surge damping valve and an electronic gas mass flow controller; the component gas circuit 2 comprises a surge damping valve, an electronic gas pressure controller, multiple capillary tubes and a heating constant temperature bath; the dilution gas circuit comprises a surge damping valve and an electronic gas mass flow controller; and the control system is connected with the multi-component gas circuit, the dilution gas circuit and the mixing cushion gas chamber. The dynamic trace gas concentration distributing apparatus has the advantages of high precision, wide dilution ratio, diverse adaptive gases, fast response speed, continuous adjustable concentration values, immunity to environment temperature and pressure and the like. By adopting the apparatus, mixing standard gases with various concentration scopes can be continuously prepared and supplied, automatic and dynamic calibrating of a gas detector and a sensor can be effectively realized, and therefore, the apparatus has certain practical application value in the field of gas analysis.
Description
Technical field
The utility model relates to device for distributing standard gas field, more particularly, relates to a kind of dynamic trace gas concentration air distributing device.
Background technology
Calibrating gas, as the measurement standard of gas componant value, has been widely used in the calibration of scientific research, atmosphere environment supervision, instrument and meter, the fields such as check of chemical products.Along with economic and scientific and technical fast development, the purposes of calibrating gas is day by day extensive, and particularly at gas-monitoring and detection field, calibrating gas is detection method, analytical instrument, monitoring technology and the important evidence of carrying out quality control.
In gas concentration, detect in application, for majority of gas analytical instrument (comprising gas chromatograph, infrared spectrum etc.) and sensor gained digital quantity, be relative value or non-linear, need different actual concentration gas standard specimens to carry out multi-point calibration, set up and proofread and correct matched curve, and calculate unknown gas concentration.Theoretical according to curve, calibration point is more, and the I/O curve of matching is more accurate.Different calibration points, the calibrating gas sample of need preparation variable concentrations value, concentration range is from constant (%) to trace (ppb).For specialized factory, adopt static method preparation gas, be difficult to obtain a ppb grade standard gas accurately, there is certain difficulty; For application units, configure the calibrating gas of multiple concentration, trace calibrating gas particularly, cost is high, waste large (calibrating gas has certain storage life); Daily servicing and calibration for detecting device in online analytical instrument or sensor, bring very big inconvenience, greatly improves the maintenance cost of instrument.
Due to above various demands, the a set of dynamic trace gas concentration air distributing device of the utility model design, the continuously adjustable polycomponent hybrid standard of automatic preparation concentration gases continuously, and can make compound concentration arrive trace level (ppt) calibrating gas, be not subject to environment temperature, pressure and dissimilar gases affect, there is good using value.
Summary of the invention
Technical problem to be solved in the utility model is the continuously adjustable polycomponent hybrid standard of a kind of automatic preparation continuously concentration gases to be provided, and can to make compound concentration arrive the dynamic trace gas concentration air distributing device of trace level (ppt) calibrating gas.
In order to address the above problem, the utility model provides dynamic trace gas concentration air distributing device, it is characterized in that, described dynamic trace gas concentration air distributing device comprises:
Polycomponent gas circuit, described polycomponent gas circuit comprises a group or several groups in component gas 1 or component gas 2, described component gas 1 comprises pressure maintaining valve and electronic gas mass flow controller, and described component gas 2 comprises pressure maintaining valve, electronic gas pressure controller, organizes kapillary and heated constant temperature groove more;
Dilution gas circuit, described dilution gas circuit comprises pressure maintaining valve and electronic gas mass flow controller;
Mix buffer air chamber, described mixing buffer air chamber is to include the floating stainless steel gas cushion chamber body stirring of magnetic, and described polycomponent gas circuit, dilution gas circuit and mixing buffer air chamber are connected; And
Control system, described control system is connected with polycomponent gas circuit, dilution gas circuit and mixing buffer air chamber, by LCD keyboard or computing machine, carries out setting and the demonstration to each functional module parameter in device.
As a preferred version, the flow control scope of described electronic gas mass flow controller is at 0～100ml/min or 0～200ml/min or 0～1000ml/min.
As a preferred version, described many group kapillaries are glass fibre material, and its caliber is not more than 0.1mm, and is installed in the heated constant temperature groove of steady temperature.
Dynamic trace gas concentration air distributing device principle:
Devince By Dynamic Gas Ration Method is to prepare continuously as required the calibrating gas of serial variable concentrations by air distributing device, indispensable device during Chang Zuowei gas analysis instrument periodic verification.Because this air distributing method can constantly obtain the Standard Gases of variable concentrations by changing the condition of work of air distributing device, can coordinate analytical instrument to formulate fast working curve, the sexual intercourse of check analysis instrument line, determine analytical instrument duty.
Devince By Dynamic Gas Ration Method is based on throughput ratio, by the flow of accurate control component gas and diluents, and mixed and makes calibrating gas.The control of its gas flow and micrometeor adopts the method for high-precision electronic gas mass flow controller and gas pressure regulator, thus the compound concentration of control criterion gas accurately.Owing to using gaseous tension to control, and under stationary temperature environmental baseline, without considering the type of gas and the composition of mixing gas component, arrive and accurately control micrometeor (being less than 0.01ml/min flow).
When preparation single component Standard Gases, key is measurement and the control of zero gas (carrier gas) and composition flow rate, the even mixing of this two-way gas flow path, and the mass balance of arrival gas concentration, that is:
(formula 1)
In formula: Ci---concentration of component in normal mixture;
C0---component gas original concentration;
Fc---component gas (high concentration Standard Gases) flow;
Fz---zero gas (carrier gas) flow;
Cz---impure concentration in zero gas;
Fb---mixed gas outlet flow (total flow);
Fxb---combination gas residual air rate of discharge;
If zero gas (carrier gas) is high-purity gas, wherein contained impurity can be ignored, and (formula 1) becomes:
According to the eternal law of quality, discharge relation has:
(formula 3) substitution (formula 2) is obtained:
Its dilution ratio is
That is:
(formula 6)
In formula: m---dilution ratio;
When preparation polycomponent Standard Gases, by (formula 6), derive and calculate, can obtain flow and zero gas (carrier gas) throughput ratio of each component gas:
According to above throughput ratio, by electronic gas mass flow controller or gas pressure regulator, set the flow of each component gas and zero gas (carrier gas), can accurately dynamically prepare and be met the polycomponent of requirement or the hybrid standard gas of single component.
The utility model has the advantage of, dynamically trace gas concentration air distributing device has that precision is high, dilution ratio is wide, suitable gas is many, and fast response time, concentration value are adjustable continuously, and are not subject to the advantages such as impact of environment temperature and pressure.Can prepare continuously and supply with the hybrid standard gas of various concentration ranges, the effective automatic dynamic calibrating function that carries out for to detector and sensor has certain actual application value in gas analysis field.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of the dynamic trace gas concentration of the utility model air distributing device.
Wherein:
1-component gas 1; 11-pressure maintaining valve; 12-electronic gas mass flow controller;
2-component gas 2; 21-pressure maintaining valve; 22-electronic gas pressure controller; 23-organize kapillary more; 24-heated constant temperature groove;
3-dilution gas circuit; 31-pressure maintaining valve; 32-electronic gas mass flow controller;
4-mixing buffer air chamber; 41-magnetic is floating to be stirred;
5-control system; 51-LCD keyboard; 52---computing machine; 53-analytical instrument.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated, the purposes of embodiment is only to explain and non-limiting the technical solution of the utility model.
Referring to Fig. 1, is the composition structural representation of the dynamic trace gas concentration of the utility model air distributing device one preferred embodiment shown in Fig. 1.
As shown in Figure 1, dynamically trace gas concentration air distributing device comprises: polycomponent gas circuit, dilution gas circuit 3, mixing buffer air chamber 4 and control system 5.
In Fig. 1, polycomponent gas circuit comprises component gas 11 and component gas 22, described component gas 11 comprises pressure maintaining valve 11 and electronic gas mass flow controller 12, and described component gas 22 comprises pressure maintaining valve 21, electronic gas pressure controller 22, organizes kapillary 23 and heated constant temperature groove 24 more.
Polycomponent gas circuit in the utility model be comprise in component gas 11 or component gas 22 one or more all can, according to the needs of institute's distribution, select.Can only contain component gas 11, also can only contain component gas 22, also can contain many group component gas 11 and/or organize component gas 22 more.
Electronic gas mass flow controller 12 is a kind of according to setting gas flow, High Precision Automatic closed-loop control (PID fuzzy control), with temperature compensation, the variation with ambient temperature and pressure does not affect, the function with constant gas flow, and can control according to the selection of different gas type (four kinds of pure gas).Its flow control scope, at 0～100ml/min or 0～200ml/min or 0～1000ml/min etc., can be determined according to the requirement of preparation gas output total flow.Under this kind of flow control mode to the dilution ratio scope of component gas 1～200, dilute concentration is ppm level.
Electronic gas pressure controller 22, organize kapillary 23 and heated constant temperature groove 24 more and form another kind of gas flow and control.Owing to flowing through, gas flow capillaceous is followed Hagen-Poiseuille law, the size of gas flow is determined by internal diameter capillaceous, length, ambient temperature, prime and rear stage pressure, in kapillary, gas differential pressure and flow are certain relation, by changing the forepressure of component gas, reach the object of controlling micrometeor (minimum flow 0.01ml/min), realizing dilute concentration is ppt level.
Component gas forepressure control to adopt electronic gas pressure controller 22, and control accuracy is at ± 1pa.Many group kapillaries 23 are glass fibre material, and its caliber is not more than 0.1mm, and is installed in the heated constant temperature groove 24 of steady temperature, and temperature control precision, at ± 0.2 ℃, keeps constant temperature ambient condition.By controlling built-in miniature valve body switch state, select the kapillary of different bores, reach the function of automatic expansion flow range.
Please continue referring to Fig. 1, dilution gas circuit 3 comprises pressure maintaining valve 31 and electronic gas mass flow controller 32.Can select to control constant rate according to the gas type of carrier gas.
Mix buffer air chamber 4 for including floating 41 the stainless steel gas cushion chamber body that stirs of magnetic, inside insert quartz fibre, can make multichannel component gas and carrier gas evenly mix, and have mix,, the function of not adsorbing, can maintain certain pressure short, corrosion-resistant without dead angle, gas time to be stayed.Polycomponent gas circuit, dilution gas circuit 3 and mixing buffer air chamber 4 are connected.
Please continue referring to Fig. 1, control system 5 is connected with polycomponent gas circuit 1,2, dilution gas circuit 3 and mixing buffer air chamber 4, by LCD keyboard 51 and/or computing machine 52, carries out setting and the demonstration to each functional module parameter in device.Control system 5 adopts modular design, by LCD keyboard 51 and/or PC computing machine 52, carry out setting and the demonstration to each functional module parameter in device, reach human-computer interaction function, realize the functions such as gas sampling synchro control of initialization, gaseous tension or traffic channel setting, data acquisition, data analysis and the external analysis instrument of equipment.
The preset parameter values such as pressure versus flow, gas density and level pressure of various gas under standard state in control system 5, realizes and automatically calculates in real time calibration.User only need input the concentration of component gas and set concentration, system can be calculated setting flow or the pressure of each gas flow path automatically, and by RS-485 communication bus transmitting control data and Real-time Feedback data, by the flow value of each gas flow path, calculated the concentration of gas composition, arrive the function showing in real time.
The dynamically application of trace gas concentration air distributing device:
One, in the foundation of analytical approach and the application of evaluation
1, utilize the different concentration gases of demarcating of dynamic trace gas concentration air distributing device preparation, carry out qualitative analysis and quantitative test, set up calibration curve and concentration correction card;
2, utilize the checking evaluation of calibrating gas to the analysis method choice optimum operation condition of mensurated gas composition sample and analytical approach.
Two, in the Test Application to the performance index of detector and sensor
1, be applied to the technical indicator of the Determination of Trace Volatile gas analysis detecting device of ppm and ppt to comprise the test evaluation of inspection sensitivity, the linearity, sensing range, repeatability, accuracy, and set up national standard or industry standard.Trace gas detector application comprises the detecting devices such as pulse flame photometric detector (FPD) (PFPD), atomic emission detection device (AED), pulsed discharge helium ionization detector (PDHID), reduction detecting device (RGD);
2, all kinds of gas sensors, non-dispersive infrared detector (NDIR) etc. have nonlinear characteristic, in the production run of instrument and sensor, utilize the different demarcation concentration gases of dynamic gas concentration air distributing device preparation, set up the standard of gas concentration scale, reach accurate gas concentration and detect.
Three, the application in on-line industry gas analysis instrument
On-line industry gas analysis instrument is a kind of unattended analytical instrument instrument, the characteristic with fully automation, regularly automatically apply dynamic gas concentration distribution parts, the running status of test and examination analytical instrument, guarantees the security of production run and analyzes data credibility.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. dynamic trace gas concentration air distributing device, is characterized in that, described dynamic trace gas concentration air distributing device comprises:
Polycomponent gas circuit, described polycomponent gas circuit comprises a group or several groups in component gas 1 or component gas 2, described component gas 1 comprises pressure maintaining valve and electronic gas mass flow controller, and described component gas 2 comprises pressure maintaining valve, electronic gas pressure controller, organizes kapillary and heated constant temperature groove more;
Dilution gas circuit, described dilution gas circuit comprises pressure maintaining valve and electronic gas mass flow controller;
Mix buffer air chamber, described mixing buffer air chamber is to include the floating stainless steel gas cushion chamber body stirring of magnetic, and described polycomponent gas circuit, dilution gas circuit and mixing buffer air chamber are connected; And
Control system, described control system is connected with polycomponent gas circuit, dilution gas circuit and mixing buffer air chamber, by LCD keyboard or computing machine, carries out setting and the demonstration to each functional module parameter in device.
2. dynamic trace gas concentration air distributing device according to claim 1, is characterized in that, the flow control scope of described electronic gas mass flow controller is at 0～100ml/min or 0～200ml/min or 0～1000ml/min.
3. dynamic trace gas concentration air distributing device according to claim 1, is characterized in that, described many group kapillaries are glass fibre material, and its caliber is not more than 0.1mm, and is installed in the heated constant temperature groove of steady temperature.
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| CN201320447617.9U CN203422675U (en) | 2013-07-25 | 2013-07-25 | Dynamic trace gas concentration distributing apparatus |
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| CN106443031A (en) * | 2016-09-30 | 2017-02-22 | 中南林业科技大学 | Bionic smell detection and analysis device based on dynamic gas distribution and detection and analysis method of bionic smell detection and analysis device |
| CN107490644A (en) * | 2017-09-25 | 2017-12-19 | 北京鹏宇昌亚环保科技有限公司 | A kind of automatic calibration device and gas chromatograph |
| CN108351655A (en) * | 2015-08-26 | 2018-07-31 | 株式会社富士金 | Separate system |
| CN108554207A (en) * | 2018-06-15 | 2018-09-21 | 上海雷密传感技术有限公司 | A kind of low concentration calibrating gas continues generating means and its method for generation |
| CN110954659A (en) * | 2019-12-04 | 2020-04-03 | 日照市计量测试所 | Intelligent gas distribution system for online detection |
| CN111122797A (en) * | 2020-01-19 | 2020-05-08 | 防灾科技学院 | Manufacturing system and method of constant value ternary mixed standard gas |
| CN111111481A (en) * | 2020-01-19 | 2020-05-08 | 防灾科技学院 | Manufacturing system and method for trace dissolved ternary mixed gas standard solution |
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| CN111408289A (en) * | 2020-03-30 | 2020-07-14 | 山东重山光电材料股份有限公司 | Method and system for industrially continuously mixing gas with high precision |
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| CN112557591A (en) * | 2020-11-16 | 2021-03-26 | 中国科学院工程热物理研究所 | Dynamic mixed gas full-component flow calibration system and calibration method |
| CN113607882A (en) * | 2021-06-28 | 2021-11-05 | 宁波大学 | Ultralow-concentration flowing gas distribution system and gas distribution method |
| CN113960248A (en) * | 2021-09-17 | 2022-01-21 | 奕瑞影像科技成都有限公司 | Testing tool for trace gas detection equipment and sample preparation method |
| CN113984960A (en) * | 2021-09-24 | 2022-01-28 | 中汽研汽车检验中心（天津）有限公司 | Method for researching odor characteristics of multi-component gas in dynamic mixing mode |
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- 2013-07-25 CN CN201320447617.9U patent/CN203422675U/en not_active Expired - Fee Related
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| CN108351655A (en) * | 2015-08-26 | 2018-07-31 | 株式会社富士金 | Separate system |
| CN106443031A (en) * | 2016-09-30 | 2017-02-22 | 中南林业科技大学 | Bionic smell detection and analysis device based on dynamic gas distribution and detection and analysis method of bionic smell detection and analysis device |
| CN106443031B (en) * | 2016-09-30 | 2017-12-01 | 中南林业科技大学 | Bionic olfactory detection and analysis device and its determination method based on dynamic air-distributing |
| CN107490644A (en) * | 2017-09-25 | 2017-12-19 | 北京鹏宇昌亚环保科技有限公司 | A kind of automatic calibration device and gas chromatograph |
| CN108554207B (en) * | 2018-06-15 | 2023-12-12 | 上海雷密传感技术有限公司 | Low-concentration standard gas continuous generation device and generation method thereof |
| CN108554207A (en) * | 2018-06-15 | 2018-09-21 | 上海雷密传感技术有限公司 | A kind of low concentration calibrating gas continues generating means and its method for generation |
| CN110954659A (en) * | 2019-12-04 | 2020-04-03 | 日照市计量测试所 | Intelligent gas distribution system for online detection |
| CN110954659B (en) * | 2019-12-04 | 2022-02-01 | 日照市计量测试所 | Intelligent gas distribution system for online detection |
| CN111122797A (en) * | 2020-01-19 | 2020-05-08 | 防灾科技学院 | Manufacturing system and method of constant value ternary mixed standard gas |
| CN111111481A (en) * | 2020-01-19 | 2020-05-08 | 防灾科技学院 | Manufacturing system and method for trace dissolved ternary mixed gas standard solution |
| CN111167325A (en) * | 2020-01-19 | 2020-05-19 | 防灾科技学院 | Control method for manufacturing constant value ternary mixed standard gas |
| CN111111481B (en) * | 2020-01-19 | 2024-01-23 | 防灾科技学院 | System and method for manufacturing trace dissolved ternary mixed gas standard solution |
| CN111122797B (en) * | 2020-01-19 | 2023-11-10 | 防灾科技学院 | System and method for manufacturing fixed-value ternary mixed standard gas |
| CN111167325B (en) * | 2020-01-19 | 2023-04-07 | 防灾科技学院 | Control method for manufacturing constant value ternary mixed standard gas |
| CN111257596A (en) * | 2020-02-25 | 2020-06-09 | 西南交通大学 | Scanning probe microscope narrow and small experiment chamber environment atmosphere accurate control device |
| CN111257596B (en) * | 2020-02-25 | 2021-09-14 | 西南交通大学 | Scanning probe microscope narrow and small experiment chamber environment atmosphere accurate control device |
| CN111408289A (en) * | 2020-03-30 | 2020-07-14 | 山东重山光电材料股份有限公司 | Method and system for industrially continuously mixing gas with high precision |
| CN111610189B (en) * | 2020-07-03 | 2021-08-31 | 福州大学 | Optical calibration system and method for concentration of multi-component gas |
| CN111610189A (en) * | 2020-07-03 | 2020-09-01 | 福州大学 | Optical calibration system and method for concentration of multi-component gas |
| CN112557591A (en) * | 2020-11-16 | 2021-03-26 | 中国科学院工程热物理研究所 | Dynamic mixed gas full-component flow calibration system and calibration method |
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