CN106225422A - A kind of Automatic load change optimal control method for interior compression strap argon air separation plant - Google Patents
A kind of Automatic load change optimal control method for interior compression strap argon air separation plant Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
- F25J3/048—Argon recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
- F25J3/048—Argon recovery
- F25J3/04806—High purity argon purification
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04848—Control strategy, e.g. advanced process control or dynamic modeling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2280/00—Control of the process or apparatus
- F25J2280/50—Advanced process control, e.g. adaptive or multivariable control
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
A kind of Automatic load change optimal control method for interior compression strap argon air separation plant, it is characterized in that described Automatic load change optimal control method to be mainly in view of between the Shang Ta of air separation unit, Xia Ta, crude argon column, air compressor machine, supercharger, decompressor each unit influencing each other, couple serious phenomenon, the varying duty using a large-scale predictive controller to realize air separation unit controls function, and its scope includes Shang Ta, Xia Ta, molecular sieve, crude argon column, pure argon column, air compressor machine, supercharger, decompressor each unit；Described large-scale predictive controller uses the operation trace LPV modeling method with product oxygen flow as scheduling variable, sets up the varying duty nonlinear dynamical model of air separation plant；It effectively reduces the process variable fluctuation range during varying duty, more rapid, smoothly realize varying duty operation, reduces Oxygen bleeding rate, it is achieved air separation plant energy-saving and cost-reducing.
Description
Technical field
The present invention relates to a kind of Automatic load change optimal control method for interior compression strap argon air separation plant, belong to
Interior compression strap argon air separation plant automation engineering technical field.
Background technology
Interior compression strap argon air separation plant uses room temperature molecular sieve purification air, middle pressure booster expansion turbine refrigeration, liquid oxygen
The flow process of compression in interior compression, part liquid argon；Use structured packing technology and Full distillation argon making technique.
After raw air removes dust and mechanical admixture in the filter, enter air compressor and be compressed to certain pressure,
Send into air cooling compressor and carry out pre-cooling.The feedwater of air cooling compressor is divided into two sections, and the hypomere of cooling tower uses through water-treated
Recirculated water, and the epimere of cooling tower then uses water cooled tower and the water at low temperature of handpiece Water Chilling Units cooling；Air cooling compressor top sets
Put mesh mist eliminator, to remove the water droplet in air.
The air going out air cooling compressor enters the molecular sieve adsorber being used alternatingly；There the moisture content in raw air,
The foreign bodys such as CO2, C2H2 are by molecular sieve adsorption.
Processing air after purification is divided into four strands, and one is as instrument air；One enters main heat exchanger, with the dirt backflowed
Enter lower tower after nitrogen, low-pressure nitrogen, middle hydraulic fluid oxygen heat exchange and carry out rectification；It is further divided into after one stock-traders' know-how air booster one section compression
Two strands, cool down through gas cooler again after the pressurized end supercharging of one intensified decompressor of air being equivalent to swell increment, enter
Main heat exchanger, extracts out in the middle part of heat exchanger, enters decompressor, enters lower tower and carry out rectification after expansion.Another strand of gas is through air
Supercharger two-stage nitration compresses, and enters back into main heat exchanger cooling, enters lower tower after throttling.
Air, after the preliminary rectification of lower tower, obtains liquid air at lower tower bottom, obtains pure liquid nitrogen at lower top of tower, and through supercool
Device supercool deutomerite stream enters upper tower.After the further rectification of upper tower, obtain liquid oxygen at upper tower bottom, and be compressed to through liquid oxygen pump
3.1MPa (A) enters main heat exchanger, as product cooling box after re-heat.The direct cooling box of part liquid oxygen enters as liquid oxygen product
Storage tank.
Drawing pure nitrogen gas, cooling box after subcooler, main heat exchanger re-heat from upper top of tower, wherein one sends into low pressure nitrogen
Press compression can switch water-cooling tower to 1.1MPa (A), this strand of low-pressure nitrogen product；Another stock sends into medium pressure nitrogen air compressor
It is compressed to 2.6MPa (A).
Extract liquid nitrogen product from upper top of tower, enter storage tank.Dirty nitrogen is drawn, through subcooler, main heat exchange from upper tower top
Cooling box after device re-heat, first meets the needs of the regeneration gas being used as molecular sieve, and redundance is sent to water-cooling tower.
In the middle part of upper tower, extract a certain amount of Argon fraction send into crude argon column.Crude argon column is structurally divided into two sections, second segment
Withdrawing fluid bottom (crude argon column II) argon column enters first paragraph (crude argon column I) top as backflow through liquid pumping.Argon fraction
Obtain crude argon through crude argon column rectification, and send in the middle part of pure argon column, after rectification, obtain product seminal fluid argon at tower bottom, send into liquid
Argon storage tank.
From liquid argon storage tank extraction part seminal fluid argon product through press and send into ice chest after liquid argon pump supercharging, then through in pressure argon heat exchange
Cooling box after device re-heat, presses argon pipe network in feeding.
Owing to air separation unit has, unit is many, long flow path, dependency process characteristic big, baroque, determines change negative
Lotus process operation has a feature that control point is many, coupling is serious, operation easier is big that relates to:
(1) employing in a large number in air separation unit and be thermally integrated and Recycle of material technology, as above tower and lower tower share one
Condenser/evaporator；A lower tower liquid air part refluxes directly as in the middle part of upper tower, and additionally part provides cold for condenser of crude argon tower,
Finally return to tower in space division and participate in rectification.Be thermally integrated technology and Recycle of material technology make air separation unit have typical energy with
The feature of height of materials coupling: be thermally integrated and decrease degree of freedom in system so that between unit, association strengthens, and causes disturbance to be prone to
Transmit between unit；Recycle of material makes the dynamic characteristic of space division flow process become more complicated, defines with positive feedback character
The inner loop of material and energy, delayed the dynamic response that process is overall.These factors increase air separation unit varying duty
The difficulty of operation so that during varying duty, it is impossible to individually the unit of device is adjusted, therefore the PID of routine control
System is difficult to the operation requirement of competent space division varying duty.
(2) air separation unit varying duty on a large scale can cause the nonlinear Control requirement of process.Need to adapt to downstream oxygen
The change asked, air separation unit can not be fixed under certain operating condition operation for a long time, it is necessary to carry out in time varying duty operation with
Avoid diffusing of product oxygen, cause meaningless economic loss.Owing to the essence of industrial process is nonlinear so that corresponding
Process control Linear Control in traditional a certain operating area, is changed into and meets what commercial plant required in big operating area
Nonlinear Control.
(3) operation of air separation unit varying duty is a Dynamic Regulating Process becoming operating point, is that production process is from a work
Condition is to the transition of another operating mode.But in ascending, descending load process, user determines it is only the size of product yield, the most really
The desired value of other process variable of the operating mode that sets the goal, this has related to the problem that optimum operating condition calculates.At air separation unit
In excellent condition calculating, on the premise of meeting whole process material balance, the energy balance, product constraint and output demand, in addition it is also necessary to
Consider the whole process operation optimization of air separation unit, improve product extraction ratio, drop low operating pressure, it is achieved in the case of varying duty
The excellent energy balance, material balance, it is achieved energy-saving and cost-reducing target.
Summary of the invention
Lack a set of effective Automatic load change system for current Air separation industry, it is an object of the invention to provide interior compression
With the Automatic load change optimal control method of argon air separation plant, it effectively reduces the process variable fluctuation model during varying duty
Enclose, more rapid, smoothly realize varying duty operation, reduce Oxygen bleeding rate, it is achieved air separation plant energy-saving and cost-reducing.
It is an object of the invention to complete by following technical solution, described one sets for interior compression strap argon space division
Standby Automatic load change optimal control method, it is characterised in that described Automatic load change optimal control method is mainly in view of sky
Influence each other between the Shang Ta of separating device, Xia Ta, crude argon column, air compressor machine, supercharger, decompressor each unit, couple serious showing
As, use a large-scale predictive controller realize air separation unit varying duty control function, its scope include Shang Ta, Xia Ta,
Molecular sieve, crude argon column, pure argon column, air compressor machine, supercharger, decompressor each unit；
Described large-scale predictive controller uses the operation trace LPV modeling method with product oxygen flow as scheduling variable,
Set up the varying duty nonlinear dynamical model of air separation plant.
As preferably: described Automatic load change optimal control method, specifically include following steps:
1) determine the non-linear dynamical behavior of varying duty process due to product oxygen flow, choose product oxygen flow conduct
Scheduling variable；
2) according to the operation trace scope of product oxygen flow, several exemplary operation points are selected；
3) at each exemplary operation point, carry out the device to test of routine, obtain testing data；
4) test data according to each operating point, pick out corresponding linear dynamic model；
5) according to the transit data between operating point test data and each operating point, by the multinomial letter of product oxygen flow
Number carrys out interpolation each operating point model, it is thus achieved that the varying duty nonlinear dynamical model of air separation plant.
As preferably: the controlled variable of described large-scale predictive controller is: lower tower Purity of liquid air, Xia Ta middle and upper part oxygen divide
Analysis, the analysis of product oxygen purity, product nitrogen gas purity analysis, the analysis of upper tower dirt nitrogen gas purity, Argon fraction argon content, crude argon column I
Top oxygen analysis, crude argon column II top oxygen analysis, crude argon column II push up argon content analysis, pure argon column analysis of nitrogen content, product
Oxygen flow, product nitrogen gas flow, nitrogen products flow, product liquid oxygen flow, crude argon flow, Argon fraction flow, pneumatics are dynamo-electric
Stream, air compressor guide vane aperture, supercharger one-level guide vane opening, two grades of guide vane openings of supercharger, air compressor machine surge margin, one section of increasing
Press surge margin, two-stage nitration supercharger surge margin, air enters expander temperature, air goes out expander temperature, lower tower resistance, on
Tower resistance, crude argon column I resistance and crude argon column II resistance.
As preferably: the performance variable of described large-scale predictive controller is: total air mass flow, product oxygen flow, product
Product nitrogen flow, nitrogen products flow, liquid nitrogen fraction enter upper tower flow, pure liquid nitrogen enters upper tower flow, expanded air flow, high pressure empty
Throughput, upper tower dirt nitrogen pressure, condenser of crude argon tower liquid level, crude argon flow, pure argon column pressure reduction, condenser/evaporator level set
Value and high-pressure throttle.
As preferably: the performance variable of described large-scale predictive controller is: product oxygen setting value is inclined with actual value
Difference and molecular sieve boosting event.
As preferably: the priority level of described controlled variable, the controlled variable that preferential guarantee is important, pay the utmost attention to equipment
Security constraint, then ensures the constraint of valve position, finally considers purity index and the yield index of product, and purity is compared with yield,
First have to meet is purity index.
The present invention ensures speed and the quality that varying duty operates, and solves the nonlinear problem of varying duty process, operation coupling
Conjunction problem, it is possible to more effectively reduce the fluctuation of equipment key variables, more rapid, smoothly realize varying duty operation.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be described in detail: a kind of for interior compression strap argon air separation plant
Automatic load change optimal control method, described Automatic load change optimal control method be mainly in view of the upper tower of air separation unit,
Influence each other between lower tower, crude argon column, air compressor machine, supercharger, decompressor each unit, couple serious phenomenon, use one greatly
Type predictive controller realize air separation unit varying duty control function, its scope include Shang Ta, Xia Ta, molecular sieve, crude argon column,
Pure argon column, air compressor machine, supercharger, decompressor each unit；
Described large-scale predictive controller uses the operation trace LPV modeling method with product oxygen flow as scheduling variable,
Set up the varying duty nonlinear dynamical model of air separation plant.
Automatic load change optimal control method of the present invention, specifically includes following steps:
1) determine the non-linear dynamical behavior of varying duty process due to product oxygen flow, choose product oxygen flow conduct
Scheduling variable；
2) according to the operation trace scope of product oxygen flow, several exemplary operation points are selected；
3) at each exemplary operation point, carry out the device to test of routine, obtain testing data；
4) test data according to each operating point, pick out corresponding linear dynamic model；
5) according to the transit data between operating point test data and each operating point, by the multinomial letter of product oxygen flow
Number carrys out interpolation each operating point model, it is thus achieved that the varying duty nonlinear dynamical model of air separation plant.
The controlled variable of described large-scale predictive controller is: lower tower Purity of liquid air, Xia Ta middle and upper part oxygen are analyzed, product oxygen
Gas purity analysis, product nitrogen gas purity analysis, upper tower dirt nitrogen gas purity analysis, Argon fraction argon content, crude argon column I top oxygen content divide
Analysis, crude argon column II top oxygen analysis, crude argon column II push up argon content analysis, pure argon column analysis of nitrogen content, product oxygen flow, product
Product nitrogen flow, nitrogen products flow, product liquid oxygen flow, crude argon flow, Argon fraction flow, air compressor machine electric current, air compressor machine are led
Leaf aperture, supercharger one-level guide vane opening, two grades of guide vane openings of supercharger, air compressor machine surge margin, one section of supercharger surge are abundant
Degree, two-stage nitration supercharger surge margin, air enters expander temperature, air goes out expander temperature, lower tower resistance, upper tower resistance, thick
Argon column I resistance and crude argon column II resistance.
The priority level of described controlled variable, the controlled variable that preferential guarantee is important, pay the utmost attention to the security constraint of equipment,
Then ensure the constraint of valve position, finally consider purity index and the yield index of product, and purity is compared with yield, first has to meet
Be purity index.
The performance variable of described large-scale predictive controller is: total air mass flow, product oxygen flow, product nitrogen stream
Amount, nitrogen products flow, liquid nitrogen fraction enter upper tower flow, pure liquid nitrogen enters upper tower flow, expanded air flow, high pressure air flow,
Upper tower dirt nitrogen pressure, condenser of crude argon tower liquid level, crude argon flow, pure argon column pressure reduction, condenser/evaporator level set value and height
Pressure choke valve.
The performance variable of described large-scale predictive controller is: product oxygen setting value and the deviation of actual value and molecular sieve
Boosting event.
Embodiment:
The present invention is in view of between the Shang Ta of air separation unit, Xia Ta, crude argon column, air compressor machine, supercharger, decompressor each unit
Influencing each other, couple serious phenomenon, the varying duty using a large-scale predictive controller to realize air separation unit controls function,
Its scope includes Shang Ta, Xia Ta, molecular sieve, crude argon column, pure argon column, air compressor machine, supercharger, decompressor each unit.
Described predictive controller uses the operation trace LPV modeling method with product oxygen flow as scheduling variable, sets up
The varying duty nonlinear dynamical model of air separation plant.
The method specifically includes following steps:
1) determine the non-linear dynamical behavior of varying duty process due to product oxygen flow, choose product oxygen flow conduct
Scheduling variable；
2) according to the operation trace scope of product oxygen flow, several exemplary operation points are selected；
3) at each exemplary operation point, carry out the device to test of routine, obtain testing data；
4) test data according to each operating point, pick out corresponding linear dynamic model；
5) according to the transit data between operating point test data and each operating point, by the multinomial letter of product oxygen flow
Number carrys out interpolation each operating point model, it is thus achieved that the varying duty nonlinear dynamical model of air separation plant.
Described large-scale predictive controller is formed by with lower part:
(1) controlled variable and the explanation of large-scale predictive controller are as shown in table 1
Table 1 controlled variable (CVs)
(2) performance variable and the explanation of large-scale predictive controller are as shown in table 2
Table 2 performance variable (MVs)
(3) disturbance variable and the explanation of large-scale predictive controller are as shown in table 3
Table 3 disturbance variable (DVs)
| Sequence number | Describe |
| Product oxygen setting value and the deviation of actual value | |
| Molecular sieve boosting event |
(4) priority level according to controlled variable of large-scale predictive controller, the controlled variable that preferential guarantee is important.Control
Device ensures device stable operation, reduces the fluctuation of crucial controlled variable；According to the priority level of controlled variable, preferential guarantee is important
Controlled variable.
The controlled variable of air separation unit is generally divided into following four classes:
1) facility constraints: air compressor machine surge margin, a section of supercharger surge margin, two-stage nitration supercharger surge margin, air
Enter expander temperature, air goes out expander temperature, lower tower resistance, upper tower resistance, crude argon column I resistance and crude argon column II resistance；
2) valve position constraint: air compressor machine electric current, air compressor guide vane aperture, supercharger one-level guide vane opening and supercharger two grades are led
Leaf aperture
3) product purity constraint: lower tower Purity of liquid air, Xia Ta middle and upper part oxygen are analyzed, product oxygen purity is analyzed, product nitrogen
Gas purity analysis, upper tower dirt nitrogen gas purity analysis, Argon fraction argon content, crude argon column I top oxygen analysis, crude argon column II top oxygen contain
Component analysis, crude argon column II top argon content analysis and pure argon column analysis of nitrogen content.
4) yield index: product oxygen flow, product nitrogen gas flow, nitrogen products flow, product liquid oxygen flow, crude argon stream
Amount and Argon fraction flow.
Above-mentioned controlled variable, is from high to low on importance and priority level.Because, the most all should be by
The safety of equipment is put in the first place, and the restriction beyond equipment will cause device damage or device to stop.The constraint of valve position is to maintain dress
Put the condition normally controlling to run counter to.Thus these 2 the purity indexs higher than product and yield index.Purity and yield
Comparing, first have to meet is purity index.
The present invention solves the nonlinear problem of varying duty process, operation coupled problem, it is ensured that the speed of varying duty operation
With quality, it is possible to more effectively reduce the fluctuation of equipment key variables, more rapid, smoothly realize varying duty operation.
Claims (6)
1. the Automatic load change optimal control method for interior compression strap argon air separation plant, it is characterised in that described is automatic
It is each that varying duty optimal control method is mainly in view of the Shang Ta of air separation unit, Xia Ta, crude argon column, air compressor machine, supercharger, decompressor
Influence each other between unit, couple serious phenomenon, use a large-scale predictive controller to realize the varying duty of air separation unit
Controlling function, its scope includes Shang Ta, Xia Ta, molecular sieve, crude argon column, pure argon column, air compressor machine, supercharger, decompressor each unit；
Described large-scale predictive controller uses the operation trace LPV modeling method with product oxygen flow as scheduling variable, sets up
The varying duty nonlinear dynamical model of air separation plant.
Automatic load change optimal control method for interior compression strap argon air separation plant the most according to claim 1, it is special
Levy and be described Automatic load change optimal control method, specifically include following steps:
1) determine the non-linear dynamical behavior of varying duty process due to product oxygen flow, choose product oxygen flow as scheduling
Variable；
2) according to the operation trace scope of product oxygen flow, several exemplary operation points are selected；
3) at each exemplary operation point, carry out the device to test of routine, obtain testing data；
4) test data according to each operating point, pick out corresponding linear dynamic model；
5) according to the transit data between operating point test data and each operating point, come by the polynomial function of product oxygen flow
Interpolation each operating point model, it is thus achieved that the varying duty nonlinear dynamical model of air separation plant.
The Automatic load change optimal control method of interior compression strap argon air separation plant the most according to claim 1, its feature exists
Controlled variable in described large-scale predictive controller is: lower tower Purity of liquid air, Xia Ta middle and upper part oxygen are analyzed, product oxygen purity
Analysis, product nitrogen gas purity analysis, the analysis of upper tower dirt nitrogen gas purity, Argon fraction argon content, crude argon column I top oxygen analysis, thick
Argon column II top oxygen analysis, crude argon column II push up argon content analysis, pure argon column analysis of nitrogen content, product oxygen flow, product nitrogen
Throughput, nitrogen products flow, product liquid oxygen flow, crude argon flow, Argon fraction flow, air compressor machine electric current, air compressor guide vane are opened
Degree, supercharger one-level guide vane opening, two grades of guide vane openings of supercharger, air compressor machine surge margin, one section of supercharger surge margin, two
Section supercharger surge margin, air enters expander temperature, air goes out expander temperature, lower tower resistance, upper tower resistance, crude argon column I
Resistance and crude argon column II resistance.
The Automatic load change optimal control method of interior compression strap argon air separation plant the most according to claim 1, its feature exists
Performance variable in described large-scale predictive controller is: total air mass flow, product oxygen flow, product nitrogen gas flow, product
Liquid nitrogen flow, liquid nitrogen fraction enter upper tower flow, pure liquid nitrogen enters upper tower flow, expanded air flow, high pressure air flow, upper tower dirt nitrogen
Pressure, condenser of crude argon tower liquid level, crude argon flow, pure argon column pressure reduction, condenser/evaporator level set value and high-pressure throttle.
The Automatic load change optimal control method of interior compression strap argon air separation plant the most according to claim 1, its feature exists
Performance variable in described large-scale predictive controller is: product oxygen setting value and the deviation of actual value and molecular sieve boosting thing
Part.
The Automatic load change optimal control method of interior compression strap argon air separation plant the most according to claim 3, its feature exists
In the priority level of described controlled variable, the controlled variable that preferential guarantee is important, pay the utmost attention to the security constraint of equipment, then protect
The constraint of card valve position, finally considers purity index and the yield index of product, and purity is compared with yield, first have to meet is pure
Degree index.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024076A (en) * | 2017-03-29 | 2017-08-08 | 北京首钢股份有限公司 | A kind of control method of the stable Argon fraction of air separation plant |
| CN107490245A (en) * | 2017-07-19 | 2017-12-19 | 浙江智海化工设备工程有限公司 | A kind of Automatic load change control method for air separation unit |
| CN109764638A (en) * | 2018-12-13 | 2019-05-17 | 包头钢铁（集团）有限责任公司 | A kind of large oxygen-making machine group ar system varying duty method |
| CN110243138A (en) * | 2019-04-03 | 2019-09-17 | 上海迎飞能源科技有限公司 | A kind of air separation equipment model feedforward control system and method |
| CN111023700A (en) * | 2019-12-31 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Method for identifying and processing pseudo nitrogen plug of crude argon system to improve argon yield |
| CN111306890A (en) * | 2020-01-24 | 2020-06-19 | 杭州制氧机集团股份有限公司 | One-key start-stop control method for external compression argon-containing air separation device |
| CN113899162A (en) * | 2021-10-15 | 2022-01-07 | 华能（天津）煤气化发电有限公司 | Rapid load-variable air separation device for IGCC power station and control method thereof |
| CN114484263A (en) * | 2022-01-07 | 2022-05-13 | 首钢京唐钢铁联合有限责任公司 | Automatic load changing method and system for nitrogen-oxygen liquefaction device |
| CN117537573A (en) * | 2023-11-13 | 2024-02-09 | 广州广钢气体能源股份有限公司 | Intelligent control method, system, equipment and storage medium for air separation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107024076A (en) * | 2017-03-29 | 2017-08-08 | 北京首钢股份有限公司 | A kind of control method of the stable Argon fraction of air separation plant |
| CN107490245B (en) * | 2017-07-19 | 2020-06-23 | 浙江智海化工设备工程有限公司 | Automatic load-variable control method for air separation device |
| CN107490245A (en) * | 2017-07-19 | 2017-12-19 | 浙江智海化工设备工程有限公司 | A kind of Automatic load change control method for air separation unit |
| CN109764638A (en) * | 2018-12-13 | 2019-05-17 | 包头钢铁（集团）有限责任公司 | A kind of large oxygen-making machine group ar system varying duty method |
| CN109764638B (en) * | 2018-12-13 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Load-variable method for argon system of large oxygen generator set |
| CN110243138A (en) * | 2019-04-03 | 2019-09-17 | 上海迎飞能源科技有限公司 | A kind of air separation equipment model feedforward control system and method |
| CN110243138B (en) * | 2019-04-03 | 2021-12-10 | 上海联风能源科技有限公司 | Air separation equipment model feedforward control system and method |
| CN111023700A (en) * | 2019-12-31 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Method for identifying and processing pseudo nitrogen plug of crude argon system to improve argon yield |
| CN111306890A (en) * | 2020-01-24 | 2020-06-19 | 杭州制氧机集团股份有限公司 | One-key start-stop control method for external compression argon-containing air separation device |
| CN111306890B (en) * | 2020-01-24 | 2021-12-03 | 杭州制氧机集团股份有限公司 | One-key start-stop control method for external compression argon-containing air separation device |
| CN113899162A (en) * | 2021-10-15 | 2022-01-07 | 华能（天津）煤气化发电有限公司 | Rapid load-variable air separation device for IGCC power station and control method thereof |
| CN114484263A (en) * | 2022-01-07 | 2022-05-13 | 首钢京唐钢铁联合有限责任公司 | Automatic load changing method and system for nitrogen-oxygen liquefaction device |
| CN117537573A (en) * | 2023-11-13 | 2024-02-09 | 广州广钢气体能源股份有限公司 | Intelligent control method, system, equipment and storage medium for air separation device |
| CN117537573B (en) * | 2023-11-13 | 2024-07-05 | 广州广钢气体能源股份有限公司 | Intelligent control method, system, equipment and storage medium for air separation device |
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