CN102996421A - Automatic control method for stabilizing outlet pressure of air compressor through using PS (PostScript) way - Google Patents
Automatic control method for stabilizing outlet pressure of air compressor through using PS (PostScript) way Download PDFInfo
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- CN102996421A CN102996421A CN2012104677572A CN201210467757A CN102996421A CN 102996421 A CN102996421 A CN 102996421A CN 2012104677572 A CN2012104677572 A CN 2012104677572A CN 201210467757 A CN201210467757 A CN 201210467757A CN 102996421 A CN102996421 A CN 102996421A
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Abstract
The invention relates to an automatic control method for stabilizing outlet pressure of an air compressor through using a PS (PostScript) way. The method comprises the following steps of: (1) adding an analog input AI module and an analog output AO module in a DCS (Distributed Control System) controller; designing an FLAG marking block PICA 1044 for determining the pressure in the DCS controller; designing a sequential control functional block in the DCS controller; and designing a timing functional block CM in the DCS controller; (2) providing an outlet pressure controller I and an outlet pressure controller II in a PID (Proportion Integration Differentiation) which is connected with an outlet pressure regulating valve of the air compressor, wherein the outlet pressure controller I is connected with a first-grade guide blade and a second-grade guide blade, and the cascade regulation is carried out between the outlet pressure controller I and the outlet pressure controller II; (3) carrying out the process of the molecular sieve charging stage; (4) carrying out the process of an outlet pressure automatic compensating and timing loop of the air compressor; and (5) carrying out the process of controlling the outlet pressure of the air compressor through a regulating valve. By adopting the automatic control method, the outlet pressure compensation of the air compressor is automatically realized, so that the stability and the reliability of a working condition when air flows in a rectifying tower can be ensured.
Description
Technical field
The present invention relates to the controlling method of metallurgy industry air compressor outlet pressure, relate in particular to a kind of autocontrol method of stablizing the air compressor outlet pressure for the PS method.
Background technique
At present, the oxygen principle processed of most of the manufacture of oxygen enterprises utilizations is cryogenic refrigeration air separating method (Deep Cooling Method).Airborne chief component composition is oxygen and nitrogen and a small amount of argon gas, utilizes the difference of its three's boiling point, namely adopts cryogenic technique separated oxygen, nitrogen and argon gas from air.At first raw air enters air compressor after the self-cleaning air filter dedusting, through three grades of compressions, and two sections coolings, outlet pressure rises to≤0.57MPa, through nitrogen water prechill system, goes out air cooling tower after air is cooled to 17 ℃ and enters molecular screener adsorbing system.From bottom to top by molecular sieve adsorber, the solid impurities such as the gas such as contained a small amount of moisture, carbon dioxide, hydrocarbon and dust are by absorption is clean in succession in the air at the molecular screener adsorbing system Air, and the air after the purification enters ice chest and carries out rectifying.
Molecular sieve adsorber is used alternatingly in pairs, and another is reproduced during a job.Carry out when five steps of regenerating molecular sieve time-division, be respectively release, heating, cold blowing, pressurising and switching.When molecular sieve moves to the pressurising stage, the pressurising solenoid valve gets electricly to be opened automatically, and this moment, air compressors increased, and outlet pressure reduces, and has influence on the pressure that air advances rectifying column, and then the rectifying operating mode of rectifying column is exerted an influence.
Owing to adopting PS(Pressure Supply System) before the method air compressor outlet pressure to detect in the unusual situation all be that the people is for intervening or operating, often untimely owing to operation or not precisely cause air to enter rectifying column after cause that the problem of operating mode shakiness occurs, when serious even can directly cause the generation of surge and stop.
The pressure that enters rectifying column in the molecular sieve pressurising stage in order to ensure air is steadily normal, need to carry out auto-compensation to air compressor outlet pressure regulator, the PS(Pressure Supply System that namely will mention below the present invention) method.
Summary of the invention
Technical problem to be solved by this invention provides a kind of operating mode stable and be used for reliably the autocontrol method that the PS method is stablized the air compressor outlet pressure when guaranteeing that air enters rectifying column.
For addressing the above problem, of the present inventionly a kind ofly stablize the autocontrol method of air compressor outlet pressure for the PS method, may further comprise the steps:
⑴ increase analog input AI module and output AO module in the DCS controller; FLAG symbol block PICA1044 who judges pressure of design in described DCS controller; Sequence control function block of design in described DCS controller; Clocking capability piece CM of design in described DCS controller uses 9 TIMER timers in described clocking capability piece CM, each timer timing is set as 60s, and uses 5 assignment pieces as the data assignment, and each assignment piece setting value is 0.01 MPa;
⑵ be provided with the outlet pressure controller I that links to each other with the secondary stator with the one-level stator and the outlet pressure controller II that links to each other with the secondary stator with atmospheric valve in and the PID adjusting color controls that the air compressor outlet pressure regulating valve links to each other; Be the tandem regulative mode between described outlet pressure controller I and the described outlet pressure controller II; Described one-level stator and described secondary stator are the ratiometric conversion relation;
⑶ molecular sieve pressurising stage flow process:
During regenerating molecular sieve respectively through release 8 minutes,-5 ~-4 ℃ were heated 100 minutes, 110 ~ 130 ℃ of cold blowings are after 110 minutes, when reaching, the molecular sieve temperature value enters pressurising when the lowest limit is reported to the police, pressurising this moment house steward solenoid valve, pressurising outlet solenoid valve, pressurising entrance solenoid valve is got to program schema, judge that described pressurising house steward solenoid valve opens, described pressurising outlet solenoid valve, described pressurising entrance closed electromagnetic valve, giving the described PICA1044 symbol block of pressure assignment is 1, the pressurising solenoid valve begins pressurising, pressurising is judged the molecular sieve pressure difference less than or equal to 8.0Kpa after 22 minutes, finish the pressurising step; And trigger simultaneously in the described DCS controller air compressor outlet pressure compensation sequential;
⑷ air compressor outlet pressure auto-compensation timing loop flow process:
Start described TIMER timer, improved in order air compressor outlet pressure regulating valve setting value 0.01MPa every 60 seconds, control experience 5 minutes, improve altogether 0.05 MPa, this moment, air compressor outlet pressure value reached working condition requirement, progressively reduced afterwards 0.01MPa every 60 seconds again, carried out 5 minutes, pressure returns to initial conditions to be finished, and pressure stability is normal when guaranteeing that next action cycle begins, and whole program is moved 10 minutes altogether;
⑸ air compressor outlet pressure regulating valve control flow:
The air compressor outlet pressure is sent into respectively described AI module respectively as the process values of described outlet pressure controller I, described pressure controller II, when actual exhaust air pressure is lower than the pressure of described outlet pressure controller I, the setting of described pressure controller II, after the computing of described PID adjusting color controls, the control signal of output constantly increases, by one-level stator, secondary stator ratiometric conversion relation, by the aperture of opening of described AO template contral one-level stator, secondary stator valve; When pressure that actual exhaust air pressure is set greater than described outlet pressure controller I, described pressure controller II, after the computing of described PID adjusting color controls, the control signal of output constantly reduces, by one-level stator, secondary stator ratiometric conversion relation, by closing of described AO template contral one-level stator, secondary stator valve.
The setting value of described step ⑵ middle outlet pressure controller II is than the large 0.3KPa of setting value of described outlet pressure controller I.
The present invention compared with prior art has the following advantages:
Adopt the inventive method, molecular sieve equipment moves to the pressurising stage, get electric when automatically opening at the pressurising solenoid valve, air compressor outlet pressure regulator in the DCS controller by the sequential that designs and strategy, automatically realize the compensation of air compressor outlet pressure, after finishing, pressurising recovers again original outlet pressure value detecting, thus ready for circulate next time, guarantee the stable of operating mode when air enters rectifying column and reliably.The present invention is widely used in the enterprise that utilizes cryogenic refrigeration air separating method (Deep Cooling Method) to make oxygen.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the regenerative process sequence figure of molecular sieve adsorber of the present invention.
Fig. 2 is air compressor outlet pressure auto-compensation timing of the present invention loop flow chart.
Fig. 3 is PICA10441/2 controller relation principle figure of the present invention.
Fig. 4 is that the present invention's oxygen air compressor processed outlet pressure is regulated schematic representation.
Among the figure: 1-DCS controller, 2-PID adjusting color controls, 3-outlet pressure controller I, 4-outlet pressure controller II, 5-one-level stator, 6-secondary stator, 7-air compressor outlet pressure, 8-atmospheric valve.
Embodiment
A kind ofly stablize the autocontrol method of air compressor outlet pressure for the PS method, may further comprise the steps:
⑴ increase analog input AI module and output AO module in DCS controller 1; FLAG symbol block PICA1044 who judges pressure of design in DCS controller 1; Sequence control function block of design in DCS controller 1; Clocking capability piece CM of design in DCS controller 1 uses 9 TIMER timers in clocking capability piece CM, each timer timing is set as 60s, and uses 5 assignment pieces as the data assignment, and each assignment piece setting value is 0.01 MPa.
⑵ be provided with the outlet pressure controller I 3 that links to each other with secondary stator 6 with one-level stator 5 and the outlet pressure controller II 4 that links to each other with secondary stator 6 with atmospheric valve 8 in and the PID adjusting color controls 2 that the air compressor outlet pressure regulating valve links to each other; Be the tandem regulative mode between outlet pressure controller I 3 and the outlet pressure controller II 4; One-level stator 5 is the ratiometric conversion relation with secondary stator 6; The setting value of outlet pressure controller II 4 is than the large 0.3KPa of setting value of outlet pressure controller I 3.
⑶ molecular sieve pressurising stage flow process (referring to Fig. 1):
During regenerating molecular sieve respectively through release 8 minutes ,-5 ~-4 ℃ of heating 100 minutes, 110 ~ 130 ℃ cold blowings after 110 minutes, when reaching, the molecular sieve temperature value enters pressurising when the lowest limit is reported to the police, pressurising this moment house steward solenoid valve, pressurising outlet solenoid valve, pressurising entrance solenoid valve are got to program schema, judgement pressurising house steward solenoid valve is opened, pressurising outlet solenoid valve, pressurising entrance closed electromagnetic valve, giving pressure P ICA1044 symbol block assignment is 1, the pressurising solenoid valve begins pressurising, pressurising is judged the molecular sieve pressure difference less than or equal to 8.0Kpa after 22 minutes, finish the pressurising step; And trigger simultaneously in the DCS controller 1 air compressor outlet pressure compensation sequential.
⑷ air compressor outlet pressure auto-compensation timing loop flow process (referring to Fig. 2):
Start described TIMER timer, improved in order air compressor outlet pressure regulating valve setting value 0.01MPa every 60 seconds, control experience 5 minutes, improve altogether 0.05 MPa, this moment, air compressor outlet pressure value reached working condition requirement, progressively reduced afterwards 0.01MPa every 60 seconds again, carried out 5 minutes, pressure returns to initial conditions to be finished, and pressure stability is normal when guaranteeing that next action cycle begins, and whole program is moved 10 minutes altogether.
⑸ air compressor outlet pressure regulating valve control flow (referring to Fig. 3, Fig. 4):
Air compressor outlet pressure 7 is sent into respectively the AI module respectively as the process values of outlet pressure controller I 3, pressure controller II 4, when actual exhaust air pressure is lower than the pressure of outlet pressure controller I 3,4 settings of pressure controller II, after 2 computings of PID adjusting color controls, the control signal of output constantly increases, by one-level stator 5, secondary stator 6 ratiometric conversions relation, by the aperture of opening of AO template contral one-level stator 5, secondary stator 6 valves; When pressure that actual exhaust air pressure is set greater than outlet pressure controller I 3, pressure controller II 4, after 2 computings of PID adjusting color controls, the control signal of output constantly reduces, by one-level stator 5, secondary stator 6 ratiometric conversions relation, by closing of AO template contral one-level stator 5, secondary stator 6 valves.
Claims (2)
1. one kind is used for the autocontrol method that the PS method is stablized the air compressor outlet pressure, may further comprise the steps:
⑴ increase analog input AI module and output AO module in DCS controller (1); FLAG symbol block PICA1044 who judges pressure of design in described DCS controller (1); Sequence control function block of design in described DCS controller (1); Clocking capability piece CM of design in described DCS controller (1), in described clocking capability piece CM, use 9 TIMER timers, each timer timing is set as 60s, and uses 5 assignment pieces as the data assignment, and each assignment piece setting value is 0.01 MPa;
⑵ be provided with the outlet pressure controller I (3) that links to each other with secondary stator (6) with one-level stator (5) and the outlet pressure controller II (4) that links to each other with secondary stator (6) with atmospheric valve (8) in the PID adjusting color controls (2) that link to each other with the air compressor outlet pressure regulating valve; Be the tandem regulative mode between described outlet pressure controller I (3) and the described outlet pressure controller II (4); Described one-level stator (5) is the ratiometric conversion relation with described secondary stator (6);
⑶ molecular sieve pressurising stage flow process:
During regenerating molecular sieve respectively through release 8 minutes,-5 ~-4 ℃ were heated 100 minutes, 110 ~ 130 ℃ of cold blowings are after 110 minutes, when reaching, the molecular sieve temperature value enters pressurising when the lowest limit is reported to the police, pressurising this moment house steward solenoid valve, pressurising outlet solenoid valve, pressurising entrance solenoid valve is got to program schema, judge that described pressurising house steward solenoid valve opens, described pressurising outlet solenoid valve, described pressurising entrance closed electromagnetic valve, giving the described PICA1044 symbol block of pressure assignment is 1, the pressurising solenoid valve begins pressurising, pressurising is judged the molecular sieve pressure difference less than or equal to 8.0Kpa after 22 minutes, finish the pressurising step; And trigger simultaneously air compressor outlet pressure compensation sequential in the described DCS controller (1);
⑷ air compressor outlet pressure auto-compensation timing loop flow process:
Start described TIMER timer, improved in order air compressor outlet pressure regulating valve setting value 0.01MPa every 60 seconds, control experience 5 minutes, improve altogether 0.05 MPa, this moment, air compressor outlet pressure value reached working condition requirement, progressively reduced afterwards 0.01MPa every 60 seconds again, carried out 5 minutes, pressure returns to initial conditions to be finished, and pressure stability is normal when guaranteeing that next action cycle begins, and whole program is moved 10 minutes altogether;
⑸ air compressor outlet pressure regulating valve control flow:
Air compressor outlet pressure (7) is sent into respectively described AI module respectively as the process values of described outlet pressure controller I (3), described pressure controller II (4), when actual exhaust air pressure is lower than the pressure of described outlet pressure controller I (3), described pressure controller II (4) setting, after described PID adjusting color controls (2) computing, the control signal of output constantly increases, by one-level stator (5), secondary stator (6) ratiometric conversion relation, by the aperture of opening of described AO template contral one-level stator (5), secondary stator (6) valve; When pressure that actual exhaust air pressure is set greater than described outlet pressure controller I (3), described pressure controller II (4), after described PID adjusting color controls (2) computing, the control signal of output constantly reduces, by one-level stator (5), secondary stator (6) ratiometric conversion relation, by closing of described AO template contral one-level stator (5), secondary stator (6) valve.
2. as claimed in claim 1ly a kind ofly stablize the autocontrol method of air compressor outlet pressure for the PS method, it is characterized in that: the setting value of described step ⑵ middle outlet pressure controller II (4) is than the large 0.3KPa of setting value of described outlet pressure controller I (3).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664264A (en) * | 2017-10-31 | 2018-02-06 | 陕西煤化能源有限公司 | A kind of high pressure oxygen network security interlock |
| CN113945066A (en) * | 2021-10-08 | 2022-01-18 | 邯郸钢铁集团有限责任公司 | Method for eliminating influence of molecular sieve switching on working condition of main tower by large-scale air separation |
| CN114151320A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Identification algorithm for instability of compressor flow system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664264A (en) * | 2017-10-31 | 2018-02-06 | 陕西煤化能源有限公司 | A kind of high pressure oxygen network security interlock |
| CN113945066A (en) * | 2021-10-08 | 2022-01-18 | 邯郸钢铁集团有限责任公司 | Method for eliminating influence of molecular sieve switching on working condition of main tower by large-scale air separation |
| CN114151320A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Identification algorithm for instability of compressor flow system |
| CN114151320B (en) * | 2021-10-20 | 2023-06-13 | 中国航发四川燃气涡轮研究院 | Identification algorithm for instability of compressor flow system |
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