CN105543443B - A method of being used for coal gas of converter pressuring machine antisurge control system - Google Patents
A method of being used for coal gas of converter pressuring machine antisurge control system Download PDFInfo
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- 239000003034 coal gas Substances 0.000 title claims abstract description 8
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- 238000009628 steelmaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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Abstract
The present invention provides a kind of coal gas of converter pressuring machine antisurge control system and methods, wherein：Coal gas of converter pressuring machine antisurge control system include electric control gear control converter gas cabinet ontology, electric precipitator be connected to by Pressure Unit enter, exit butterfly valve group, further include return valve, pressure transmitter and gas flow meter, it is characterised in that：Producer gas cabinet ontology has coal gas of converter entrance and reflux inlet and gas exit；Pressure Unit includes inlet, outlet end, and inlet end is connected to entrance butterfly valve group through pipeline, and outlet side is connected to exit butterfly valve group through pipeline；Electric precipitator is connected to by pipeline between gas exit and entrance butterfly valve group；And pressure transmitter, gas flow meter are sequentially located on the pipeline of connection exit butterfly valve group outlet, return valve one end is connected to by pipeline on the pipeline between exit butterfly valve group and pressure transmitter simultaneously, the other end is connected to reflux inlet through pipeline, by previous constructions, it solves the technical issues of Anti-surge Control, has reached the good result for improving operational efficiency, reducing energy consumption, stablizing ductwork pressure.
Description
Technical Field
The invention relates to the technical field of converter gas tank systems, in particular to a method for providing an anti-surge control system for a converter gas pressurizer.
Background
The recycling of the converter gas is an important measure for saving energy, reducing consumption and improving benefits of enterprises, and is beneficial to reducing pollution and improving environment. The gas pressure in the converter gas chamber is only about 3kPa, which cannot meet the pressure requirements of each production user of an enterprise, so that the gas needs to be pressurized by a pressurizing machine. During the pressurization process, when a small flow runs, the gas in the flow passage of the impeller and the diffuser generates vortex, the vortex is formed and disappears, the liquid wheel flow passage is blocked when formed, the gas flow and the blades generate frequency vibration, so that serious periodic vibration and roar are generated in the machine, and the phenomenon is called as the surging of the centrifugal compressor. The strong vibration of the blades caused by the strong pulsation and periodic oscillation of the airflow greatly increases the stress of the impeller, aggravates the noise, causes the strong vibration of the whole unit, and may damage the bearing and the seal, thereby causing parking or serious accidents. Surging is the special unstable operating condition of a pressurizer, the surging severely limits the stable working range and the operating efficiency of a fan, and once the surging occurs, the fan can be greatly damaged. Therefore, the anti-surge control is an indispensable function in the pressurizer control system.
The anti-surge control not only can close the safety of the air compressor, but also can affect the operating efficiency of the compressor, and the optimization of the anti-surge control is also an important link for saving energy of the compressor. How to effectively prevent surging on the premise of meeting the technological requirements and improve the operating efficiency of a pressurizer as much as possible is always a difficult point of controlling a system. The traditional anti-surge control method is to try to increase the flow by reducing the resistance of the pipe network when the flow of the pipe network is too low or the pressure is too high, namely, a method of adjusting a backflow regulating valve is adopted to keep the operation point of the fan at the lower right of a surge line without entering a surge area. This anti-surge strategy, while high safety factor, comes at the expense of fan operating range and performance efficiency. The specific problems are mainly shown as follows:
firstly, in the specific design and production process of the gas pressurizer, a large margin is always reserved for avoiding surging of the output capacity of the gas pressurizer, and redundant gas flows back to a gas tank, so that the energy consumption of equipment is greatly increased, and the operation efficiency is reduced.
Secondly, the frequency conversion pressurizer and the backflow regulating valve interfere with each other in regulation of the outlet pressure of the pressurizer, a serious coupling relation exists, and simultaneous regulation cannot be realized.
And thirdly, when surging occurs, the backflow regulating valve cannot be opened quickly. After jumping out of the surge area, overshoot is easy to occur, and manual adjustment is needed according to manual experience.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an anti-surge control system and method for a converter gas pressurizer.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a converter coal gas presser surge-proof control system, including the converter coal gas cabinet body, the electrostatic precipitator of electrically controlled device control and through the income of pressurization unit intercommunication, export butterfly valves, still include backflow control valve, pressure transmitter and gas flowmeter, wherein: the furnace gas cabinet body is provided with a converter gas inlet, a backflow inlet and a gas outlet; the pressurizing unit comprises an air inlet end and an air outlet end, the air inlet end is communicated with the inlet butterfly valve group through a pipeline, and the air outlet end is communicated with the outlet butterfly valve group through a pipeline; the electric dust collector is communicated between the coal gas outlet and the inlet butterfly valve group through a pipeline; the pressure transmitter and the gas flowmeter are sequentially arranged on a pipeline communicated with an outlet of the outlet butterfly valve group, one end of the backflow regulating valve is communicated on the pipeline between the outlet butterfly valve group and the pressure transmitter through a pipeline, and the other end of the backflow regulating valve is communicated with the backflow inlet through a pipeline.
In the present embodiment, it is preferable that: the pressurization unit includes first to fourth pressurizer, and the entry butterfly valves group includes first to fourth entry butterfly valve and export butterfly valves group includes first to fourth export butterfly valve, wherein: the inlet ends of the first to fourth pressurizers are respectively communicated with the first to fourth inlet butterfly valves through pipelines, and the outlet ends of the first to fourth pressurizers are respectively communicated with the first to fourth outlet butterfly valves through pipelines.
In the present embodiment, it is preferable that: the pipeline between electrostatic precipitator and the entry butterfly valves is a logical four pipelines, wherein: the four-way pipeline comprises an inlet and four outlets, the outlet of the electric dust collector is communicated with the inlet through a pipeline, and the four outlets are respectively communicated with the first inlet butterfly valve, the second inlet butterfly valve, the fourth inlet butterfly valve and the fourth inlet butterfly valve through pipelines; the pipeline between export butterfly valves and the pressure transmitter is a four-way pipeline, wherein: the four-way valve comprises four inlets and an outlet, wherein the four inlets are respectively communicated with the outlets of the butterfly valves of the first outlet, the second outlet and the fourth outlet through pipelines, and the outlet is communicated to an external mechanism through a pipeline.
In order to achieve the purpose, the technical scheme of the invention is as follows: the method for providing the anti-surge control system of the converter gas pressurizer comprises a pressurizer variable-frequency pressure control loop and a backflow regulating valve flow control loop, wherein: the pressure set value of the outlet of the pressurizing machine is manually set by a process engineer according to the production process requirement, and the PID controller is used for controlling the frequency converter of the pressurizing machine according to the deviation of the pressure set value of the outlet and the detection value, so that the pressure of the outlet is stably controlled by adjusting the rotating speed of the pressurizing machine. Meanwhile, in order to prevent the rotating speed of the pressurizer from being too low, the output of the PID controller is subjected to amplitude limiting control. When the rotating speed of the pressurizer reaches the lower limit of the rotating speed, the outlet pressure of the pressurizer still does not meet the process requirement, a control object of the control loop is converted into a backflow regulating valve, and the outlet pressure of the pressurizer is controlled by regulating the backflow regulating valve; the flow control loop of the backflow regulating valve comprises a mathematical model for establishing a surge alarm line, a deviation between the outlet flow of the pressurizer and the flow corresponding to the surge alarm line is used as a controlled variable, and variable PID control and regular control are combined to realize anti-surge control.
In the present embodiment, it is preferable that: the mathematical model for establishing the surge warning line is a mathematical equation for establishing the distance between the operating point and the surge point of the pressurizer, and comprises a mathematical equation of the surge high warning line and a mathematical equation of the surge high warning line.
In the present embodiment, it is preferable that: the anti-surge control method comprises the following steps:
calculating the flow corresponding to a surge high alarm line and the flow corresponding to the surge high alarm line at the current rotating speed of the pressurizer according to a mathematical model of the surge alarm line;
when the detected value of the outlet flow of the pressurizing machine is smaller than the flow corresponding to the surge high-warning line, the backflow regulating valve is opened to a corresponding opening degree under the control of the electric control device, so that the outlet flow of the pressurizing machine is larger than the flow corresponding to the surge-preventing high-warning line, and the working point of the upper pressurizing machine is quickly away from a surge area;
when the detected value of the outlet flow of the pressurizer is larger than the flow corresponding to the surge high-high alarm line, the flow corresponding to the surge alarm line is used as a set value of a flow regulating loop, and the deviation between the detected value of the outlet flow of the pressurizer and the flow corresponding to the surge alarm line is used as a controlled quantity to automatically regulate the backflow regulating valve;
and fourthly, when the rotating speed of the pressurizer is lower limit and the outlet pressure does not meet the set value, the control loop is converted from the flow control loop to a pressure control loop, and therefore the outlet pressure of the pressurizer is controlled through the backflow regulating valve.
In the present embodiment, it is preferable that: the back flow regulator valve operating speed is determined by the proportional gain of the PID controller.
In the present embodiment, it is preferable that: the PID controller controls the operation of the backflow regulating valve in an asymmetrical fast opening and slow closing mode.
Compared with the prior art, the invention has the beneficial effects that: the operation efficiency of the pressurizer is improved, the energy consumption is reduced, the pressure of a pipe network is stabilized, and stable and reliable converter gas is improved for each production user.
Drawings
FIG. 1 is a flow chart of a converter gas holder system, which comprises a gas holder body facility, an electric dust remover, a converter gas pressurizing station and other equipment, wherein 4 pressurizing machines adopt a frequency conversion control technology and have two functions. The system can store converter gas intermittently generated in the steel-making production process, and the converter gas is uniformly and stably supplied to each user for use after being dedusted and pressurized. In the figure 1, a converter gas cabinet body 1, an electric dust collector 2, pressurizer inlet butterfly valves 3, 6, 9 and 12, pressurizer outlet butterfly valves 4, 7, 10 and 13, pressurizers 5, 8, 11 and 14, a backflow regulating valve 15, a pressure transmitter 16 and a gas flowmeter 17.
Fig. 2 is a graph of the pressurizer flow characteristics.
Fig. 3 is a graph showing the change of the intersection point of the wind resistance characteristic curve of the pipe network and the flow characteristic curve of the pressurizer.
Fig. 4 is a schematic diagram of a pressurizer surge protection control.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining technical aspects of the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 2, in the system of the pressurizer, the pressure rise Δ P of the pressurizer is changed with the air flow Q under a certain air suction condition and a certain rotation speed, and a curve describing the relationship between the two is called a pressurizer flow characteristic curve, a P-Q line is arranged at each rotation speed, a group of convex lines are obtained at different rotation speeds, and the curve is called a pressurizer flow characteristic curve group, and the curve is formed by fitting experimental data of a pressurizer manufacturer. The flow characteristic curve of the pressurizer is the basis and foundation for researching the operating condition point of the pressurizer and implementing anti-surge control. The various pipes and vessels connected to the press are collectively referred to as a piping system. When gas passes through a pipe network system, a certain pressure is needed to overcome resistance, and a curve describing the relationship between the gas flow passing through the pipe network and the pressure required by the pipe network under the flow is called a pipe network wind resistance characteristic curveThe wind resistance characteristic curve of the pipe network can be generally expressed as delta P ═ a + RQ2
Wherein, a is a constant, R is a resistance coefficient, and Q is the flow of the pipe network. As can also be seen from the characteristic curve of fig. 2, if the pressure of the pressurizing machine is increased to a certain critical pressure at a certain rotation speed, and the operating point of the pressurizing machine is K point, the pressurizing machine will enter the surge region, and a phenomenon of downdraft and periodic oscillation occurs, and this critical point is the surge point, which corresponds to the flow rate Qk, the surge point and the outlet flow rate of the pressurizing machine. The surge points on the characteristic curves at different rotating speeds are connected to obtain the surge line of the pressurizing machine.
As shown in fig. 3, the operating point of the compressor is the intersection point of the flow characteristic curve of the compressor and the wind resistance characteristic curve of the pipe network. In the operating point, the outlet flow of the pressurizer is the inlet flow of the pipe network system, and the outlet pressure of the pressurizer is the inlet pressure of the pipe network system. Therefore, the change of the wind resistance characteristic curve of the pipe network can cause the change of the working point of the pressurizer. The rotating speed of the fan is n1 at a certain moment, the resistance coefficient of the pipe network system is R1, and the working point of the pressurizing machine is A point at the moment; when the resistance of the pipe network is increased, the characteristic curve is changed into R2, and the intersection point of the wind resistance characteristic curve of the pipe network and the flow characteristic curve of the pressurizer is changed into a point B, namely, the pressurizer system can stably operate at the point B of the working condition. As can be seen from fig. 2, at a constant rotation speed, the air volume of the pressurizer is inversely proportional to the pressure rise, and the air volume decreases as the pressure increases. Further, since the pressurizer outlet air volume and the pressure increase with the increase in the rotational speed of the pressurizer, the rotational speed can be regarded as controlling the pressurizer flow rate and pressure. From the above, in order to ensure the stability of the outlet pressure of the pressurizer, the rotation speed of the pressurizer needs to be reduced to n2, and at the same time, the resistance coefficient of the pipe network system becomes R3, the operating point of the pressurizer will move to the point C in the figure, and the outlet pressure of the pressurizer is consistent with the point a.
In order to prevent surging of the pressurizer, the setting of the minimum flow of a surge line is researched, a control strategy of a control system is analyzed in detail, a set of effective comprehensive control strategies of the pressurizer are provided, and good effects on effectiveness and economy of anti-surge control are achieved. Fig. 4 shows a compressor surge protection control schematic, which includes two control loops.
Variable-frequency pressure control loop of pressure machine
The pressure set value of the outlet of the pressurizing machine is manually set by a process engineer according to the production process requirement, and the PID controller is used for controlling the frequency converter of the pressurizing machine according to the deviation of the pressure set value of the outlet and the detection value, so that the pressure of the outlet is stably controlled by adjusting the rotating speed of the pressurizing machine. Meanwhile, in order to prevent the rotating speed of the pressurizer from being too low, the output of the PID controller is subjected to amplitude limiting control, and the lower limit of the rotating speed of the pressurizer is set. When the rotating speed of the pressurizer reaches the lower limit of the rotating speed, the outlet pressure of the pressurizer still does not meet the process requirement, the control object of the control loop is converted into a backflow regulating valve, and the outlet pressure of the pressurizer is controlled by regulating the backflow regulating valve.
Flow control loop of reflux regulating valve
1. Mathematical model for establishing surge alarm line
Determining the outlet flow value Qk of the compressor corresponding to the surge point of the compressor in the working state of power frequency according to the flow characteristic curve of the compressor provided by a manufacturer, and directly proportional to the air volume and the rotating speed of the same compressor according to the law of fansThe value Qk of the compressor outlet flow corresponding to the surge point in the operating state at different frequencies can then be calculated a priori. According to the outlet flow values of the pressurizing machines corresponding to the surge points under the working conditions of different frequencies, a surge boundary line of the pressurizing machines can be drawn, as shown in fig. 2, a surge high-altitude alarm line with a safety margin of 3% is arranged on the right side of the surge boundary line, and meanwhile, a surge high-altitude alarm line with a safety margin of 5% is arranged on the right side of the surge boundary line. According to the principle, a mathematical equation of the distance between the operating point of the pressurizer and the surge point, namely a mathematical model of a surge alarm line can be established.
Mathematical equation of surging high alarm line:
mathematical equation of surging high alarm line:
in the above formula QnWhen the rotating speed of the pressurizer is n, the outlet flow of the pressurizer corresponding to a surge point
QWorker's toolThe outlet flow of the pressurizer corresponding to a surge point when the pressurizer rotates at a power frequency
fnIs the frequency of the compressor at n times of rotation
fWorker's toolIs the frequency of the compressor at the power frequency rotation speed
2. The deviation between the outlet flow of the pressurizer and the flow corresponding to the surge alarm line is used as a controlled variable, and variable PID control and regular control are combined to realize anti-surge control.
The method comprises the first step of calculating the flow corresponding to a surge high alarm line and the flow corresponding to the surge high alarm line at the current rotating speed of the pressurizer according to a mathematical model of the surge alarm line.
And the second step, when judging that the detected value of the outlet flow of the pressurizing machine is smaller than the flow corresponding to the surge high-warning line, the closed-loop control cannot completely avoid the overshoot of the working point of the pressurizing machine to cross the surge line under the extreme working condition, the open-loop control is necessary to assist the closed-loop control to prevent the surge of the pressurizing machine, the regulation control is adopted, the backflow regulating valve is directly and quickly opened to a certain opening degree, the outlet flow of the pressurizing machine is larger than the flow corresponding to the surge high-warning line, and the working point of the pressurizing machine is quickly away from a surge area.
And thirdly, when the detected value of the outlet flow of the pressurizer is judged to be larger than the flow corresponding to the surge high-high alarm line, variable PID control is adopted, namely the flow corresponding to the surge alarm line is used as the set value of the flow regulating loop, and the deviation between the detected value of the outlet flow of the pressurizer and the flow corresponding to the surge alarm line is used as the controlled quantity to automatically regulate the backflow regulating valve. The action speed of the anti-surge backflow regulating valve is mainly determined by the proportional gain of the PID controller, and in the debugging process, if the proportional gain is increased, the backflow regulating valve is opened too fast and is overlarge during action, larger flow and pressure fluctuation are inevitably generated, if the proportional gain is reduced, the backflow regulating valve is opened too slow during action, and the condition that the pressure machine does not enter a surge area under the condition that the working point rises fast cannot be guaranteed. For the reasons, the action of the backflow regulating valve is controlled by adopting the fast-open slow-close of the asymmetrical control. When the pressurizer runs in a safety area at the lower right side of the surging high alarm line, the proportional gain of the PID controller is small, the integral time is long, and the controller enables the backflow regulating valve to be in a fully-closed state. Once the working condition point of the pressurizer approaches or exceeds the surge high warning line, the proportional gain of the PID controller is increased, the integral time is reduced, the more the surging high warning lines are exceeded, the larger the proportional gain is, the smaller the integral time is, the response speed is accelerated, and the quick opening of the backflow regulating valve is realized. When the working condition point of the pressurizer returns to the safety zone, the deviation is reduced, the proportional gain is reduced, the integral time is increased, the response speed is slowed, and the slow closing of the backflow regulating valve is realized. The anti-surge control method combines variable proportional gain and variable integral time, simultaneously changes the proportional gain and the integral time of the controller, not only ensures that the action of the backflow regulating valve has better rapidity when the operating point of the pressurizing machine crosses a surge high alarm line, but also ensures the stability of system regulation when the operating point is close to the surge high alarm line, and takes account of the rapidity of anti-surge regulation and the stability of outlet pressure of the pressurizing machine, the operating point of the pressurizing machine is accurately controlled along the surge high alarm line, and automatic 'nail' is arranged on the surge high alarm line without manually operating the backflow regulating valve. Therefore, the pressurizing machine can be prevented from entering a surge area, and meanwhile, the pressurizing machine can work near the optimal working condition point for a long time, so that the production efficiency of the pressurizing machine is improved. Further, in order to prevent the opening degree of the reflux valve from being excessively large, the output of the PID controller is subjected to a limiter control.
And fourthly, when the rotating speed of the pressurizer reaches the lower limit of the rotating speed and the outlet pressure of the pressurizer still does not meet the process requirement, the flow control loop of the control loop is converted into a pressure control loop, and the outlet pressure of the pressurizer is controlled through a backflow regulating valve.
The frequency conversion regulating circuit of the pressurizer is a pressurizer outlet pressure regulating circuit, and the set value of the frequency conversion regulating circuit is the pipe network pressure required by the process. The regulating loop of the backflow regulating valve is a gas flow regulating valve at the outlet of the pressurizer, and the set value of the backflow regulating valve is a flow value corresponding to the surge high alarm line. When the outlet flow of the pressurizing machine is reduced to be smaller than the flow value of the anti-surge high-warning line, the backflow regulating valve starts to automatically regulate and quickly opens, and the operating point of the pressurizing machine is ensured to be in a safety area near the surge high-warning line. When the outlet flow of the pressurizer is increased to be larger than the flow value corresponding to the anti-surge high-alarm line, the backflow regulating valve starts to be automatically and slowly closed, invalid backflow is avoided, and the production efficiency of the pressurizer is improved. Through the two pressure and flow loops, the decoupling control of the outlet pressure and the flow of the pressurizer is realized, the outlet pressure and the outlet flow are stabilized, and meanwhile, the surge phenomenon of the pressurizer is avoided, so that the pressurizer works near the optimal working point for a long time.
Claims (4)
1. A method for a converter gas pressurizer anti-surge control system comprises a pressurizer variable-frequency pressure control loop and a backflow regulating valve flow control loop, wherein the control system comprises a converter gas cabinet body, an electric dust remover, an inlet butterfly valve group and an outlet butterfly valve group which are communicated through a pressurizing unit, a backflow regulating valve, a pressure transmitter and a gas flowmeter, the converter gas cabinet body is provided with a converter gas inlet, a backflow inlet and a gas outlet; the pressurizing unit comprises an air inlet end and an air outlet end, the air inlet end is communicated with the inlet butterfly valve group through a pipeline, and the air outlet end is communicated with the outlet butterfly valve group through a pipeline; the electric dust collector is communicated between the coal gas outlet and the inlet butterfly valve group through a pipeline; the pressure transmitter and the gas flowmeter are sequentially arranged on a pipeline communicated with an outlet of the outlet butterfly valve group, one end of the backflow regulating valve is communicated on the pipeline between the outlet butterfly valve group and the pressure transmitter through a pipeline, and the other end of the backflow regulating valve is communicated with the backflow inlet through a pipeline; the method is characterized in that: in the frequency conversion pressure control loop of the pressurizer, a pressure set value of an outlet of the pressurizer is manually set by a process engineer according to the production process requirement, and a PID controller is used for controlling a frequency converter of the pressurizer according to the deviation of the pressure set value of the outlet and a detection value, so that the pressure of the outlet is stably controlled by adjusting the rotating speed of the pressurizer; meanwhile, in order to prevent the rotating speed of the pressurizer from being too low, the output of the PID controller is subjected to amplitude limiting control; when the rotating speed of the pressurizer reaches the lower limit of the rotating speed, the outlet pressure of the pressurizer still does not meet the process requirement, a control object of the control loop is converted into a backflow regulating valve, and the outlet pressure of the pressurizer is controlled by regulating the backflow regulating valve; the flow control loop of the backflow regulating valve comprises a mathematical model for establishing a surge alarm line, a controlled variable which is the deviation between the outlet flow of the pressurizer and the flow corresponding to the surge alarm line, and anti-surge control which is realized by combining variable PID control and regular control; establishing a mathematical model of the surge warning line is to establish a mathematical equation of the distance between the operating point of the pressurizer and the surge point, wherein the mathematical equation comprises a mathematical equation of the surge high warning line and a mathematical equation of the surge high warning line;
the mathematical model for establishing the surge alarm line specifically comprises the following steps: firstly, according to a pressurizer flow characteristic curve provided by a manufacturer, determining a pressurizer outlet flow value Qk corresponding to a surge point of the pressurizer in a power frequency working state, and according to a fan law, directly proportional to the air volume and the rotating speed of the same fanTherefore, the outlet flow value Qk of the pressurizer corresponding to the surge point under different frequency working states can be calculated in an inference mode; secondly, according to the flow value of the outlet of the pressurizer corresponding to the surge point under the working state of different frequencies, the right side of the surge boundary line is provided withA surge high-warning line with the safety margin of 3 percent, and a surge high-warning line with the safety margin of 5 percent is arranged on the right side of the surge boundary line;
wherein,
mathematical equation of surging high alarm line:
mathematical equation of surging high alarm line:
in the above formula QnWhen the rotating speed of the pressurizer is n, the outlet flow of the pressurizer corresponding to the surge point,
Qworker's toolThe flow of the outlet of the pressurizer corresponding to the surge point when the pressurizer rotates at the power frequency,
fnthe frequency is the frequency when the rotating speed of the pressurizer is n,
fworker's toolThe frequency of the pressurizer at the power frequency rotating speed is shown.
2. The method for the anti-surge control system of the converter gas pressurizer of claim 1, wherein: the anti-surge control method comprises the following steps:
calculating the flow corresponding to a surge high alarm line and the flow corresponding to the surge high alarm line at the current rotating speed of the pressurizer according to a mathematical model of the surge alarm line;
when the detected value of the outlet flow of the pressurizing machine is smaller than the flow corresponding to the surge high-warning line, the backflow regulating valve is quickly opened to a corresponding opening degree under the control of the electric control device, so that the outlet flow of the pressurizing machine is larger than the flow corresponding to the surge-preventing high-warning line, and the working point of the upper pressurizing machine is quickly away from a surge area;
when the detected value of the outlet flow of the pressurizer is larger than the flow corresponding to the surge high-high alarm line, the flow corresponding to the surge alarm line is used as a set value of a flow regulating loop, and the deviation between the detected value of the outlet flow of the pressurizer and the flow corresponding to the surge alarm line is used as a controlled quantity to automatically regulate the backflow regulating valve;
and fourthly, when the rotating speed of the pressurizer is lower limit and the outlet pressure does not meet the set value, the control loop is converted from the flow control loop to a pressure control loop, and therefore the outlet pressure of the pressurizer is controlled through the backflow regulating valve.
3. The method for the anti-surge control system of the converter gas pressurizer of claim 2, wherein: the back flow regulator valve operating speed is determined by the proportional gain of the PID controller.
4. The method of the anti-surge control system of the converter gas pressurizer as claimed in claim 3, wherein: the PID controller controls the operation of the backflow regulating valve in an asymmetrical fast opening and slow closing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003424.4A CN105543443B (en) | 2015-12-29 | 2015-12-29 | A method of being used for coal gas of converter pressuring machine antisurge control system |
Applications Claiming Priority (1)
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| CN201511003424.4A CN105543443B (en) | 2015-12-29 | 2015-12-29 | A method of being used for coal gas of converter pressuring machine antisurge control system |
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| CN106338930B (en) * | 2016-10-27 | 2019-08-30 | 中冶赛迪工程技术股份有限公司 | Iron and steel enterprise's gas pipe system and method based on dynamic analog |
| CN107338340A (en) * | 2017-03-01 | 2017-11-10 | 北京福生智源科技有限公司 | A kind of device and method for being used to prevent RECOVERY OF CONVERTER GAS blower fan surge |
| CN108708872B (en) * | 2018-04-26 | 2019-10-11 | 西安交通大学 | A kind of paired running turbocompressor control method and control system |
| CN111848455B (en) * | 2020-08-17 | 2023-05-30 | 万华化学集团股份有限公司 | Method for reducing chromaticity of isocyanate product and automatic control method for gas phase extraction flow of isocyanate rectifying tower |
| CN114776871B (en) * | 2022-04-14 | 2024-06-11 | 中国航发沈阳发动机研究所 | Air-entraining flow regulating device for process spray pipe |
| CN116201758A (en) * | 2023-02-20 | 2023-06-02 | 上海清志新能源技术有限公司 | Control method, system, equipment and storage medium of air compressor |
| CN118188559B (en) * | 2024-05-15 | 2024-08-13 | 宁波钢铁有限公司 | Converter gas pressurizing machine operation system, control method and converter gas pressurizing machine |
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