CN103970168A - Ultra-low voltage single tower deep cooling air separation process control system - Google Patents
Ultra-low voltage single tower deep cooling air separation process control system Download PDFInfo
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- CN103970168A CN103970168A CN201410212518.1A CN201410212518A CN103970168A CN 103970168 A CN103970168 A CN 103970168A CN 201410212518 A CN201410212518 A CN 201410212518A CN 103970168 A CN103970168 A CN 103970168A
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Abstract
The invention provides an ultra-low voltage single tower deep cooling air separation process control system, and relates to an air separation control system. The air separation control system is provided with an oxygen concentration controller, a tower plate temperature controller, a rectifying tower pressure controller, a tower kettle liquid level controller, a waste nitrogen lateral line discharge flow controller, a gas-oxygen discharge flow controller, a waste nitrogen flow ratio meter, a gas-oxygen flow ratio meter, the actuator of the oxygen concentration controller, the actuator of the rectifying tower pressure controller, the actuator of the tower kettle liquid level controller, the actuator of a waste nitrogen discharge flow controller, the actuator of the gas-oxygen discharge flow controller and the measuring device of an ultra-low voltage single tower deep cooling air separation process. The measuring device of the ultra-low voltage single tower deep cooling air separation process is provided with an oxygen content measuring device, a tower plate temperature measuring device, a tower pressure measuring device, a waste nitrogen lateral line discharge flow measuring device, a gas-oxygen discharge flow measuring device and a feed air flow measuring device. The control system has good antijamming capability, so the deep cooling air separation process can be operated stably and efficiently.
Description
Technical field
The present invention relates to a kind of air separation control system, especially relate to ultra-low pressure single-column deep-cooling space division technique control system.
Background technology
The industrial gasses such as the oxygen of air separation gained, nitrogen, argon are widely used in the fields such as oil, chemical industry, metallurgy, electronics, food, health care.Obtain a large amount of high-purity oxygen, nitrogen product if need, must adopt cryogenic rectification technique.For this reason, occupying very important status in the commercial Application that cryogenic rectification air separating method divides at sky, is that Present Domestic outer air separates the method extensively adopting.At present, the flow process that deep cooling air separation method technique is general is full low pressure two-tower rectification separation process.Divide in industry at sky, energy cost has accounted for 75% of air products cost.Under the situation of constantly deepening in energy crisis, the energy utilization efficiency that improves air separation technology has important society and economic implications.
In order to improve the energy utilization efficiency of cryogenic air separation technology, Chinese patent CN101464085A discloses a kind of ultra-low pressure single-column deep-cooling space division technique.Detailed process is as follows: air (flowing thigh 1) obtains stream burst 3 (flowing thigh 1 → stream strand 2 → stream thigh 3) after two compressors (B2 and B3) compression, after dewatering, purify, stream strand 3 purified devices obtain stream thigh 4, then the discharging stream burst heat exchange cooling with low temperature through main heat exchanger (B4).Before entering main heat exchanger, backflow nitrogen compresses through compressor (B10).In main heat exchanger (B4), the nitrogen of backflow is lowered the temperature.After main heat exchanger heat exchange, compressed air (stream thigh 5) is totally by decompressor B5 (flowing thigh 5 → stream thigh 6), and the Cryogenic air (stream thigh 6) that then approaches normal pressure is sent into rectification column (B1) separation.Subcooler (B7), reclaim cold energy from rectification column (B1) tower top gas nitrogen (stream thigh 7) out.In subcooler (B7), heat is realized and being exchanged between high pure nitrogen (stream strands 7 → stream strand 8), dirty nitrogen (stream strand 17 → stream strand 18) and the liquid nitrogen that refluxes (stream strand 14 → stream strand 15).The product that sky divides comprises: high-purity gas nitrogen (flowing thigh 11), dirty nitrogen (flowing thigh 19), highly purified gas oxygen (flowing thigh 22) and high-purity liquid oxygen (flowing thigh 20).
This ultra-low pressure single-column deep-cooling space division technique has adopted heat pump distillation technology, increase the degree of coupling of system, brought a very large difficult problem to the control in production run, in order to realize the commercial Application of new technological process, the design that it is carried out to control system is very important.Along with the development of computer technology, using computing machine to carry out emulation to industrial flow has become one of important means of scientific research.Divide dynamic perfromance and the response of the empty point flow process of Dynamic Simulation Analysis of flow process by sky, important guidance is provided can to design and the control of flow process.
Summary of the invention
The object of the present invention is to provide a kind of ultra-low pressure single-column deep-cooling space point Process Control System that realizes stable and high effective operation.
The present invention is provided with oxygen concentration controller, column plate temperature controller, Rectification column pressure controller, tower bottoms level controller, dirty nitrogen lateral line discharging flow controller, gas oxygen discharging flow controller, dirty nitrogen flow ratio device, gas oxygen flow comparison measurer, the actuator of oxygen concentration controller, the actuator of Rectification column pressure controller, the actuator of tower bottoms level controller, the actuator of dirty nitrogen discharging flow controller, actuator and the ultra-low pressure single-column deep-cooling space of gas oxygen discharging flow controller divide the measurement mechanism of process,
The measurement mechanism of described ultra-low pressure single-column deep-cooling space point process is provided with oxygen content measurement mechanism, column plate temperature measuring equipment, tower pressure measuring device, dirty nitrogen lateral line discharging flow measurement device, gas oxygen discharging flow measurement mechanism, feeding air flow measurement device;
The control signal output terminal of the set-point input termination oxygen concentration controller of described column plate temperature controller, the output terminal of the dirty nitrogen flow ratio of the set-point input termination device of described dirty nitrogen lateral line discharging flow controller, the output terminal of the set-point input termination gas oxygen flow comparison measurer of described gas oxygen discharging flow controller, the output terminal of the manipulated signal input termination oxygen content measurement mechanism of described oxygen concentration controller, the output terminal of the manipulated signal input termination column plate temperature measuring equipment of described column plate temperature controller, the output terminal of the manipulated signal input termination tower pressure measuring device of described Rectification column pressure controller, the output terminal of the manipulated signal input termination tower bottoms level measuring arrangement of tower bottoms level controller, the output terminal of the dirty nitrogen lateral line discharging of the controlled signal input termination flow measurement device of dirty nitrogen lateral line discharging flow controller, the output terminal of the controlled signal input termination gas oxygen discharging flow measurement mechanism of gas oxygen discharging flow controller, the control signal input end of dirty nitrogen flow ratio device taps into the output terminal of material air-flow measurement device, the control signal input end of gas oxygen flow comparison measurer taps into the output terminal of material air-flow measurement device, the input end of the actuator of the control signal output termination oxygen concentration controller of column plate temperature controller, the input end of the actuator of the control signal output termination Rectification column pressure controller of Rectification column pressure controller, the input end of the actuator of the control signal output termination tower bottoms level controller of tower bottoms level controller, the control signal output of dirty nitrogen lateral line discharging flow controller connects the input end of the actuator of dirty nitrogen lateral line discharging flow controller, the control signal output of gas oxygen discharging flow controller connects the input end of the actuator of gas oxygen discharging flow controller,
The actuator of oxygen concentration controller is connected to the nitrogen reflux pipeline of rectification column; The actuator of Rectification column pressure controller is connected to the nitrogen discharge pipe of rectification column; The actuator of tower bottoms level controller is connected to the liquid oxygen discharge pipe of rectification column; The actuator of dirty nitrogen lateral line discharging flow controller is connected to the dirty nitrogen lateral line discharging pipeline of rectification column; The actuator of gas oxygen discharging flow controller is connected to the gas oxygen discharge pipe of rectification column;
The detection signal incoming end of oxygen content measurement mechanism, column plate temperature measuring equipment, tower pressure measuring device, tower bottoms level measuring arrangement is connected to respectively rectification column; The detection signal incoming end of dirty nitrogen lateral line discharging flow measurement device is connected to the dirty nitrogen lateral line discharging pipeline of rectification column; The detection signal incoming end of gas oxygen discharging flow measurement mechanism is connected to the gas oxygen discharge pipe of rectification column; The detection signal incoming end of feeding air flow measurement device is connected to the air feed line of rectification column.
Described oxygen concentration controller, column plate temperature controller, Rectification column pressure controller, tower bottoms level controller, dirty nitrogen lateral line discharging flow controller, gas oxygen discharging flow controller all can adopt intelligent instrument, PLC (Programmable Logic Controller) or computer system etc.
The actuator of the actuator of described oxygen concentration controller, the actuator of Rectification column pressure controller, tower bottoms level controller, the actuator of dirty nitrogen discharging flow controller all can adopt frequency converter, variable valve or solenoid valve etc.
The set-point input end of the set-point input end of described oxygen concentration controller, the set-point input end of Rectification column pressure controller, tower bottoms level controller all can adopt the device that sets manually numerical value, as instrument face plate or computer keyboard, the technique ratings that need to provide according to technique in order to accept operating personnel.
The present invention can make a ultra-low pressure single-column deep-cooling space point process have good antijamming capability, thereby realizes stable, the efficiently operation of cryogenic air separation unit process.This control system has following feature: 1) feeding air flow measurement device, dirty nitrogen flow ratio device and dirty nitrogen lateral line discharging flow controller form feedforward control structure; 2) feeding air flow measurement device, gas oxygen flow comparison measurer and gas oxygen discharging flow controller form feedforward control structure; 3) output of the control signal of oxygen concentration controller is as the set-point input of column plate temperature controller, and the control signal output of column plate temperature controller is connected to the actuator of oxygen concentration controller, forms tandem control structure.
Brief description of the drawings
Fig. 1 is the composition frame chart of the embodiment of the present invention.
Fig. 2 is the response of the embodiment of the present invention main controlled variable in the time that 5% step variation occurs air feed flow.
Embodiment
Referring to Fig. 1, the embodiment of the present invention is provided with actuator K, the actuator L of Rectification column pressure controller, the actuator M of tower bottoms level controller of oxygen concentration controller C, column plate temperature controller F, Rectification column pressure controller G, tower bottoms level controller H, dirty nitrogen lateral line discharging flow controller D, gas oxygen discharging flow controller E, dirty nitrogen flow ratio device A, gas oxygen flow comparison measurer B, oxygen concentration controller, actuator I, the actuator J of gas oxygen discharging flow controller and the measurement mechanism of ultra-low pressure single-column deep-cooling space point process of dirty nitrogen discharging flow controller.
The measurement mechanism of described ultra-low pressure single-column deep-cooling space point process is provided with oxygen content measurement mechanism R, column plate temperature measuring equipment S, tower pressure measuring device T, dirty nitrogen lateral line discharging flow measurement device O, gas oxygen discharging flow measurement mechanism P, feeding air flow measurement device Q.
The set-point input end SV of described column plate temperature controller F connects the control signal output terminal of oxygen concentration controller C, the set-point input end SV of described dirty nitrogen lateral line discharging flow controller D connects the output terminal of dirty nitrogen flow ratio device A, the set-point input end SV of described gas oxygen discharging flow controller E connects the output terminal of gas oxygen flow comparison measurer B, the manipulated signal input end PV of described oxygen concentration controller C connects the output terminal of oxygen content measurement mechanism R, the manipulated signal input end PV of described column plate temperature controller F connects the output terminal of column plate temperature measuring equipment S, the manipulated signal input end PV of described Rectification column pressure controller G connects the output terminal of tower pressure measuring device T, the manipulated signal input end PV of tower bottoms level controller H connects the output terminal of tower bottoms level measuring arrangement U, the controlled signal input end PV of dirty nitrogen lateral line discharging flow controller D connects the output terminal of dirty nitrogen lateral line discharging flow measurement device O, the controlled signal input end PV of gas oxygen discharging flow controller E connects the output terminal of gas oxygen discharging flow measurement mechanism P, the control signal input end of dirty nitrogen flow ratio device A taps into the output terminal of material air-flow measurement device Q, the control signal input end of gas oxygen flow comparison measurer B taps into the output terminal of material air-flow measurement device Q, the control signal u of column plate temperature controller F
fthe input end of the actuator K of output termination oxygen concentration controller, the control signal u of Rectification column pressure controller G
gthe input end of the actuator L of output termination Rectification column pressure controller, the control signal u of tower bottoms level controller H
hthe input end of the actuator M of output termination tower bottoms level controller, the control signal u of dirty nitrogen lateral line discharging flow controller D
doutput meets the input end of the actuator I of dirty nitrogen lateral line discharging flow controller, the control signal u of gas oxygen discharging flow controller E
eoutput connects the input end of the actuator J of gas oxygen discharging flow controller.
The actuator K of oxygen concentration controller is connected to the nitrogen reflux pipeline S4 of rectification column N; The actuator L of Rectification column pressure controller is connected to the nitrogen discharge pipe S3 of rectification column N; The actuator M of tower bottoms level controller is connected to the liquid oxygen discharge pipe S1 of rectification column N; The actuator I of dirty nitrogen lateral line discharging flow controller is connected to the dirty nitrogen lateral line discharging pipeline S5 of rectification column N; The actuator J of gas oxygen discharging flow controller is connected to the gas oxygen discharge pipe S2 of rectification column N.
The detection signal incoming end of oxygen content measurement mechanism R, column plate temperature measuring equipment S, tower pressure measuring device T, tower bottoms level measuring arrangement U is connected to respectively rectification column N; The detection signal incoming end of dirty nitrogen lateral line discharging flow measurement device O is connected to the dirty nitrogen lateral line discharging pipeline S5 of rectification column N; The detection signal incoming end of gas oxygen discharging flow measurement mechanism P is connected to the gas oxygen discharge pipe S2 of rectification column N; The detection signal incoming end of feeding air flow measurement device Q is connected to the air feed line S6 of rectification column N.
Described oxygen concentration controller C, column plate temperature controller F, Rectification column pressure controller G, tower bottoms level controller H, dirty nitrogen lateral line discharging flow controller D, gas oxygen discharging flow controller E all can adopt intelligent instrument, PLC (Programmable Logic Controller) or computer system etc.
The actuator M of the actuator K of described oxygen concentration controller, the actuator L of Rectification column pressure controller, tower bottoms level controller, the actuator I of dirty nitrogen discharging flow controller all can adopt frequency converter, variable valve or solenoid valve etc.
The set-point input end SV of the set-point input end SV of described oxygen concentration controller C, the set-point input end SV of Rectification column pressure controller G, tower bottoms level controller H all can adopt the device that sets manually numerical value, as instrument face plate or computer keyboard, the technique ratings that need to provide according to technique in order to accept operating personnel.
The actuator I of dirty nitrogen lateral line discharging flow controller is the actuator of dirty nitrogen lateral line discharging flow controller D, is connected to dirty nitrogen lateral line discharging pipeline S5, in order to regulate dirty nitrogen discharging flow; The actuator J of gas oxygen discharging flow controller is the actuator of gas oxygen discharging flow controller E, is connected to gas oxygen discharge pipe S2, in order to regulate gas oxygen product flow; The actuator K of oxygen concentration controller is the actuator of column plate temperature controller F, is connected to nitrogen reflux pipeline S4, in order to regulate the capacity of returns of nitrogen; The actuator L of Rectification column pressure controller is the actuator of Rectification column pressure controller G, is connected to nitrogen discharge pipe S3, in order to regulate gas nitrogen product flow; The actuator M of tower bottoms level controller is the actuator of tower bottoms level controller H, is connected to liquid oxygen discharge pipe S1, in order to regulator solution oxygen product flow.
In oxygen concentration controller C, column plate temperature controller F, Rectification column pressure controller G, tower bottoms level controller H, dirty nitrogen lateral line discharging flow controller D, gas oxygen discharging flow controller E, the measured value of manipulated signal measured value input port (PV end) input manipulated signal, the set-point of manipulated signal set-point input port (SV end) input manipulated signal.In the present invention, the measured value of the input end access air feed flow of dirty nitrogen flow ratio device A, gas oxygen flow comparison measurer B, export respectively the set-point signal of dirty nitrogen lateral line discharging flow controller D, gas oxygen discharging flow controller E by system optimizing control, send into respectively the SV end of dirty nitrogen lateral line discharging flow controller D, gas oxygen discharging flow controller E.The SV end input signal of oxygen concentration controller C is the ratings C of gas oxygen product purity
gS(can be needed to set by technique), the input signal of PV end be the content of oxygen in the gas oxygen product of surveying, and exports the given signal u of column plate temperature controller F by system optimizing control
c, the SV that sends into column plate temperature controller F holds.The PV end input signal of dirty nitrogen lateral line discharging flow controller D is the measured value of dirty nitrogen lateral line discharging flow, calculates output control signal u through system optimizing control
ddeliver to the actuator I of dirty nitrogen lateral line discharging flow controller, realize the control to dirty nitrogen discharging flow.The PV end input signal of gas oxygen discharging flow controller E is the measured value of gas oxygen product discharging flow, calculates output control signal u through system optimizing control
edeliver to the actuator J of gas oxygen discharging flow controller, realize the control to gas oxygen discharging flow.The PV end input signal of column plate temperature controller F is the measured value of column plate (sensitive plate) temperature, calculates output control signal u through system optimizing control
fthe actuator K that delivers to gas oxygen concentration controller regulates the capacity of returns of nitrogen, reaches the target of controlling oxygen content in gas oxygen.The SV end input signal of Rectification column pressure controller G is the ratings P that tower is pressed
gS(by manufacturing process determination), PV end input signal is the rectification column internal pressure value of actual measurement, export control signal uG and delivered to the actuator L of tower pressure controller by optimized algorithm, regulates gas nitrogen product discharge flow, realizes the control to tower pressure.The SV end input signal of tower bottoms level controller H is the ratings L of tower reactor liquid level
gS(by manufacturing process determination), PV end input signal is the tower reactor liquid level of actual measurement, exports control signal u by optimized algorithm
hdeliver to the actuator M of tower bottoms level controller, regulator solution oxygen product discharging flow, realizes the control to tower reactor liquid level.Above-mentioned system optimizing control adopts conventional pid algorithm or other control algolithm in an embodiment.
Fig. 2 provides the response condition of the embodiment of the present invention main controlled variable in the time that 5% step variation occurs 1h moment air feed flow.From the experimental result of Fig. 2, control respond wellly, in the time that air feed flow 5% step occurs changes, gas nitrogen product purity, gas oxygen product purity, tower are pressed, tower reactor liquid level and sensitive plate temperature can be well controlled.
Claims (4)
1. ultra-low pressure single-column deep-cooling space divides Process Control System, it is characterized in that being provided with oxygen concentration controller, column plate temperature controller, Rectification column pressure controller, tower bottoms level controller, dirty nitrogen lateral line discharging flow controller, gas oxygen discharging flow controller, dirty nitrogen flow ratio device, gas oxygen flow comparison measurer, the actuator of oxygen concentration controller, the actuator of Rectification column pressure controller, the actuator of tower bottoms level controller, the actuator of dirty nitrogen discharging flow controller, actuator and the ultra-low pressure single-column deep-cooling space of gas oxygen discharging flow controller divide the measurement mechanism of process,
The measurement mechanism of described ultra-low pressure single-column deep-cooling space point process is provided with oxygen content measurement mechanism, column plate temperature measuring equipment, tower pressure measuring device, dirty nitrogen lateral line discharging flow measurement device, gas oxygen discharging flow measurement mechanism, feeding air flow measurement device;
The control signal output terminal of the set-point input termination oxygen concentration controller of described column plate temperature controller, the output terminal of the dirty nitrogen flow ratio of the set-point input termination device of described dirty nitrogen lateral line discharging flow controller, the output terminal of the set-point input termination gas oxygen flow comparison measurer of described gas oxygen discharging flow controller, the output terminal of the manipulated signal input termination oxygen content measurement mechanism of described oxygen concentration controller, the output terminal of the manipulated signal input termination column plate temperature measuring equipment of described column plate temperature controller, the output terminal of the manipulated signal input termination tower pressure measuring device of described Rectification column pressure controller, the output terminal of the manipulated signal input termination tower bottoms level measuring arrangement of tower bottoms level controller, the output terminal of the dirty nitrogen lateral line discharging of the controlled signal input termination flow measurement device of dirty nitrogen lateral line discharging flow controller, the output terminal of the controlled signal input termination gas oxygen discharging flow measurement mechanism of gas oxygen discharging flow controller, the control signal input end of dirty nitrogen flow ratio device taps into the output terminal of material air-flow measurement device, the control signal input end of gas oxygen flow comparison measurer taps into the output terminal of material air-flow measurement device, the input end of the actuator of the control signal output termination oxygen concentration controller of column plate temperature controller, the input end of the actuator of the control signal output termination Rectification column pressure controller of Rectification column pressure controller, the input end of the actuator of the control signal output termination tower bottoms level controller of tower bottoms level controller, the control signal output of dirty nitrogen lateral line discharging flow controller connects the input end of the actuator of dirty nitrogen lateral line discharging flow controller, the control signal output of gas oxygen discharging flow controller connects the input end of the actuator of gas oxygen discharging flow controller,
The actuator of oxygen concentration controller is connected to the nitrogen reflux pipeline of rectification column; The actuator of Rectification column pressure controller is connected to the nitrogen discharge pipe of rectification column; The actuator of tower bottoms level controller is connected to the liquid oxygen discharge pipe of rectification column; The actuator of dirty nitrogen lateral line discharging flow controller is connected to the dirty nitrogen lateral line discharging pipeline of rectification column; The actuator of gas oxygen discharging flow controller is connected to the gas oxygen discharge pipe of rectification column;
The detection signal incoming end of oxygen content measurement mechanism, column plate temperature measuring equipment, tower pressure measuring device, tower bottoms level measuring arrangement is connected to respectively rectification column; The detection signal incoming end of dirty nitrogen lateral line discharging flow measurement device is connected to the dirty nitrogen lateral line discharging pipeline of rectification column; The detection signal incoming end of gas oxygen discharging flow measurement mechanism is connected to the gas oxygen discharge pipe of rectification column; The detection signal incoming end of feeding air flow measurement device is connected to the air feed line of rectification column.
2. ultra-low pressure single-column deep-cooling space divides Process Control System as claimed in claim 1, it is characterized in that described oxygen concentration controller, column plate temperature controller, Rectification column pressure controller, tower bottoms level controller, dirty nitrogen lateral line discharging flow controller, gas oxygen discharging flow controller all adopt intelligent instrument, Programmable Logic Controller or computer system.
3. ultra-low pressure single-column deep-cooling space divides Process Control System as claimed in claim 1, it is characterized in that the actuator of described oxygen concentration controller, the actuator of Rectification column pressure controller, the actuator of tower bottoms level controller, the actuator of dirty nitrogen discharging flow controller all adopt frequency converter, variable valve or solenoid valve.
4. ultra-low pressure single-column deep-cooling space divides Process Control System as claimed in claim 1, it is characterized in that the set-point input end of described oxygen concentration controller, the set-point input end of Rectification column pressure controller, the set-point input end of tower bottoms level controller all adopt the device that sets manually numerical value, the described device that sets manually numerical value adopts instrument face plate or computer keyboard, the technique ratings that need to provide according to technique in order to accept operating personnel.
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| EP0855565A2 (en) * | 1997-01-22 | 1998-07-29 | The Boc Group, Inc. | Air separation method and apparatus |
| JPH11316081A (en) * | 1998-05-06 | 1999-11-16 | Nippon Sanso Kk | Method and device for producing oxygen |
| CN101464085A (en) * | 2009-01-08 | 2009-06-24 | 北京名都厚德科技有限公司 | Ultra-low pressure single-column deep-cooling space division technique |
| CN102538394A (en) * | 2011-12-27 | 2012-07-04 | 尤彪 | Method for separating ammonia and carbon dioxide by low-temperature rectification |
| CN103062991A (en) * | 2013-01-24 | 2013-04-24 | 成都深冷液化设备股份有限公司 | High-purity oxygen production system and high-purity oxygen preparation process of cryogenic air separation device |
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2014
- 2014-05-20 CN CN201410212518.1A patent/CN103970168B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0855565A2 (en) * | 1997-01-22 | 1998-07-29 | The Boc Group, Inc. | Air separation method and apparatus |
| JPH11316081A (en) * | 1998-05-06 | 1999-11-16 | Nippon Sanso Kk | Method and device for producing oxygen |
| CN101464085A (en) * | 2009-01-08 | 2009-06-24 | 北京名都厚德科技有限公司 | Ultra-low pressure single-column deep-cooling space division technique |
| CN102538394A (en) * | 2011-12-27 | 2012-07-04 | 尤彪 | Method for separating ammonia and carbon dioxide by low-temperature rectification |
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Non-Patent Citations (1)
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