CN116989259A - Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator - Google Patents

Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator Download PDF

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Publication number
CN116989259A
CN116989259A CN202311127333.6A CN202311127333A CN116989259A CN 116989259 A CN116989259 A CN 116989259A CN 202311127333 A CN202311127333 A CN 202311127333A CN 116989259 A CN116989259 A CN 116989259A
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China
Prior art keywords
liquid ammonia
ammonia
module
control
pipeline system
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Pending
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CN202311127333.6A
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Chinese (zh)
Inventor
刘养炯
陈玉伟
宋旭霞
杨政勇
何波
马宁
魏伟
刘蓓
张俊峰
杜业伟
刘明
高磊
刘平
沈文凯
杨军宝
杨美聪
郭强
沈浩
曹勇
张�成
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Anbang Technology Co ltd
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Anbang Technology Co ltd
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Priority to CN202311127333.6A priority Critical patent/CN116989259A/en
Publication of CN116989259A publication Critical patent/CN116989259A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/028—Special adaptations of indicating, measuring, or monitoring equipment having the volume as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/06—Pipe-line systems for gases or vapours for steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/14—Conveying liquids or viscous products by pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/013—Single phase liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0192—Propulsion of the fluid by using a working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0369—Localisation of heat exchange in or on a vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/036—Control means using alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0426—Volume
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/036—Avoiding leaks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/038—Detecting leaked fluid

Abstract

The invention discloses a control system and a control method of a dual-medium ultra-large-capacity liquid ammonia evaporator, wherein the control system comprises a measuring module, a control module, an executing module, a relay module, an ammonia concentration detecting module and an alarm module, wherein the measuring module is used for collecting the pressure of liquid ammonia conveyed by a liquid ammonia conveying pipeline system, the circulating water flow and the temperature conveyed by a circulating water conveying pipeline system, the pressure and the temperature of steam conveyed by a steam conveying pipeline system, the pressure and the temperature of ammonia conveyed by an ammonia conveying pipeline system and the pressure and the temperature on a dual-medium ultra-large-capacity liquid ammonia evaporator body. The control system and the method for the double-medium ultra-large-capacity liquid ammonia evaporator adopt a fully integrated mode, realize automatic operation, adjustment and withdrawal in the whole process, realize unattended operation, realize automatic switching of the double-medium ultra-large-capacity liquid ammonia evaporator between two heat sources, keep stable operation, integrate ammonia leakage protection control and realize safe and stable operation.

Description

Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator
Technical Field
The invention relates to the technical field of liquid ammonia evaporators, in particular to a control system and a method for a dual-medium ultra-large-capacity liquid ammonia evaporator.
Background
Ammonia is used as a good carrier of hydrogen, has high hydrogen content and high volumetric energy density compared with hydrogen, is extremely easy to liquefy and convenient to transport and store, has high safety, can effectively serve as a carrier of hydrogen and energy, is considered as a clean fuel with potential, takes ammonia as a substitute of fossil fuel, and enters a boiler for blending combustion instead of part of fossil fuel with equal heat value, so that carbon emission can be effectively reduced.
At present, energy research of a smoke stage dragon source and a combined fertilizer comprehensive national science center is carried out in China, a 40MW industrial boiler adulteration combustion test and a 300MW power station boiler adulteration combustion test are respectively carried out, feasibility of a coal-fired boiler adulteration combustion technical route is verified, but an existing single liquid ammonia evaporator on the market cannot provide large-flow ammonia, and a liquid ammonia evaporator with rated evaporation capacity of 20t/h is developed through development, so that a control system and a control method are required to be developed around the dual-medium ultra-large-capacity liquid ammonia evaporator, stable ammonia supply amount and safe operation of the system can be ensured, heat exchange mediums of the dual-medium ultra-large-capacity liquid ammonia evaporator are circulating water and steam, and energy utilization rate of a power plant is also improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a control system and a control method for a double-medium ultra-large-capacity liquid ammonia evaporator, which solve the problems that the stable ammonia supply amount cannot be ensured and the system can not safely operate.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the control system of the double-medium ultra-large-capacity liquid ammonia evaporator comprises a measuring module, a control module, an execution module, a relay module, an ammonia concentration detection module and an alarm module, wherein the measuring module is used for collecting the pressure of liquid ammonia conveyed by a liquid ammonia conveying pipeline system, circulating water flow and temperature conveyed by a circulating water conveying pipeline system, the pressure and temperature of steam conveyed by a steam conveying pipeline system, the pressure and temperature of ammonia conveyed by an ammonia conveying pipeline system and the pressure and temperature on a double-medium ultra-large-capacity liquid ammonia evaporator body, and the measuring module is electrically connected with the control module through signal transmission;
the execution module comprises a control valve unit arranged in the liquid ammonia conveying pipeline system, a power unit, a control valve unit arranged in the circulating water conveying pipeline system, a control valve unit arranged in the steam conveying pipeline system and a control valve unit arranged in the ammonia conveying pipeline system, and the control module is respectively and electrically connected with each control valve unit and the liquid ammonia conveying power unit.
Preferably, the control module is respectively and electrically connected with each control valve unit through a relay module, and the liquid ammonia conveying power unit is in control electric connection.
Preferably, the ammonia concentration detection module is used for collecting the ammonia concentration around the dual-medium ultra-large-capacity liquid ammonia evaporator, the ammonia concentration detection module is electrically connected with the control module through signal transmission, and the control module is electrically connected with the alarm module through control.
The control method of the double-medium ultra-large-capacity liquid ammonia evaporator specifically comprises the following steps:
s1, exhausting gas through a liquid ammonia pipeline, draining water through a steam pipeline, and performing heating pipe treatment;
s2, the control module firstly judges whether a liquid ammonia conveying pipeline system, a circulating water conveying pipeline system, a steam conveying pipeline system, an ammonia conveying pipeline system and a double-medium ultra-large-capacity liquid ammonia evaporator body meet the requirements of liquid ammonia conveying and evaporation based on signals acquired by the measurement module;
s3, when the liquid level signal of the liquid ammonia storage tank collected by the measuring module meets the requirement, a control valve unit in a liquid ammonia conveying pipeline system is controlled to be opened by a control module, after the control valve is confirmed to be opened, a liquid ammonia conveying power unit is controlled to be opened by the control module, and liquid ammonia is supplied to a dual-medium ultra-large-capacity liquid ammonia evaporator through a liquid ammonia conveying pipeline until the liquid ammonia is started;
s4, when the liquid level signal of the double-medium ultra-large-capacity liquid ammonia evaporator collected by the measuring module meets the requirement, a control valve unit of the circulating water conveying pipeline system is controlled by the control module to be opened for liquid ammonia evaporation;
s5, judging whether the steam pipeline system is put into the ammonia gas pipeline system or not according to the ammonia gas pipeline temperature signal acquired by the measuring module, and controlling a control valve unit of the steam pipeline system and the like to be opened through the control module if the steam pipeline system is required to be put into the ammonia gas pipeline system;
and S6, when the pressure signal acquired by the measuring module after the ammonia conveying pipeline control valve unit meets the requirement, the control module controls the control valve unit of the ammonia conveying pipeline system to be opened, so that the conversion of the liquid ammonia into the ammonia is completed and the ammonia fuel is provided for the boiler ammonia burner.
Preferably, the control module further obtains a liquid level signal of the dual-medium ultra-large-capacity liquid ammonia evaporator through the measuring module, the control module maintains the liquid level of the dual-medium ultra-large-capacity liquid ammonia evaporator to be close to a set value through the executing module, the control module further obtains an ammonia pressure signal of the ammonia conveying pipeline system through the measuring module, the control module maintains the pressure signal to be close to the set value through the executing module, the control module further obtains a temperature signal of the ammonia conveying pipeline system through the measuring module, and the control module maintains the temperature signal to be close to the set value through the executing module.
Preferably, the control module also acquires a tripping signal, and controls a control valve unit in the liquid ammonia conveying pipeline system and a liquid ammonia conveying power unit to be closed when the tripping signal is acquired.
Preferably, the control module further obtains the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator, and when the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator reaches a set upper limit threshold value, the control module controls a control valve unit in the deluge control system to be opened, and the control module generates an alarm driving signal.
Advantageous effects
The invention provides a control system and a control method for a dual-medium ultra-large-capacity liquid ammonia evaporator. Compared with the prior art, the method has the following beneficial effects:
the control system and the method for the double-medium ultra-large-capacity liquid ammonia evaporator realize automatic operation, adjustment and withdrawal in the whole process by adopting a full-integration mode, realize unattended operation, realize automatic switching of the double-medium ultra-large-capacity liquid ammonia evaporator between two heat sources, keep stable operation, integrate ammonia leakage protection control and realize safe and stable operation.
Drawings
FIG. 1 is a flow chart of the present invention.
In the figure: 1-double medium ultra-large capacity liquid ammonia evaporator, 2-liquid ammonia transfer pump inlet electric valve, 3-liquid ammonia transfer pump, 4-liquid ammonia pipeline ammonia supply stop valve, 5-liquid ammonia pipeline ammonia supply regulating valve, 6-circulating water transfer pipeline system circulating water inlet electric stop valve, 7-steam transfer pipeline system steam inlet electric stop valve, 8-steam inlet electric regulating valve, 9-ammonia gas transfer pipeline system ammonia gas outlet electric regulating valve, 10-liquid ammonia transfer pipeline system liquid ammonia transfer pump inlet pressure transmitter, 11-liquid ammonia transfer pump outlet pressure transmitter, 12-circulating water transfer pipeline system circulating water inlet thermal resistance temperature element, 13-circulating water backwater flowmeter, 14-steam transfer pipeline system steam inlet thermal resistance temperature element 15-steam inlet pressure transmitter, 16-steam inlet flowmeter, 17-steam backwater thermal resistance temperature original, 18-ammonia gas delivery pipeline system ammonia regulating valve front thermal resistance temperature original, 19-ammonia gas regulating valve rear pressure transmitter, 20-evaporator top ammonia gas pressure transmitter, 21-evaporator bottom liquid ammonia thermal resistance temperature original, 22-dual medium super-large capacity liquid ammonia evaporator liquid level gauge, 23-ammonia storage tank liquid ammonia liquid level gauge, 24-liquid ammonia delivery pipeline system liquid ammonia pump inlet thermometer, 25-liquid ammonia pump outlet pressure gauge, 26-circulating water delivery pipeline system circulating water inlet pressure gauge, 27-circulating water outlet thermometer, 28-liquid ammonia evaporator top pressure gauge, 29-dual medium super-large capacity liquid ammonia evaporator in-situ liquid level gauge, 30-site safety action valve, 31-liquid ammonia delivery pipeline system manual valve, 32-liquid ammonia pump outlet circulation manual valve, 33-liquid ammonia pipeline liquid ammonia discharge manual valve, 34-liquid ammonia pipeline liquid ammonia replacement manual valve, 35-circulating water delivery pipeline system manual valve, 36-circulating water accident water discharge manual valve, 37-steam delivery system manual valve, 38-steam pipeline drain valve, 39-ammonia delivery pipeline system manual valve, 40-liquid ammonia discharge manual valve and 41-toxic gas detection device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: the control system of the double-medium ultra-large-capacity liquid ammonia evaporator comprises a measuring module, a control module, an execution module, a relay module, an ammonia concentration detection module and an alarm module, wherein the measuring module is used for collecting the pressure of liquid ammonia conveyed by a liquid ammonia conveying pipeline system, circulating water flow and temperature conveyed by a circulating water conveying pipeline system, the pressure and temperature of steam conveyed by a steam conveying pipeline system, the pressure and temperature of ammonia conveyed by an ammonia conveying pipeline system and the pressure and temperature on a double-medium ultra-large-capacity liquid ammonia evaporator body, and the measuring module is electrically connected with the control module through signal transmission;
the execution module comprises a control valve unit arranged in the liquid ammonia conveying pipeline system, a power unit, a control valve unit arranged in the circulating water conveying pipeline system, a control valve unit arranged in the steam conveying pipeline system and a control valve unit arranged in the ammonia conveying pipeline system, and the control module is respectively and electrically connected with each control valve unit and the liquid ammonia conveying power unit.
In the invention, the control module is respectively and electrically connected with each control valve unit and the liquid ammonia conveying power unit through the relay module.
According to the invention, an ammonia concentration detection module collects the ammonia concentration around the dual-medium ultra-large-capacity liquid ammonia evaporator, the ammonia concentration detection module is electrically connected with a control module through signal transmission, and the control module is electrically connected with an alarm module in a control manner.
The invention also discloses a control method of the double-medium ultra-large-capacity liquid ammonia evaporator, which specifically comprises the following steps:
s1, exhausting gas through a liquid ammonia pipeline, draining water through a steam pipeline, and performing heating pipe treatment;
s2, the control module firstly judges whether a liquid ammonia conveying pipeline system, a circulating water conveying pipeline system, a steam conveying pipeline system, an ammonia conveying pipeline system and a double-medium ultra-large-capacity liquid ammonia evaporator body meet the requirements of liquid ammonia conveying and evaporation based on signals acquired by the measurement module;
s3, when the liquid level signal of the liquid ammonia storage tank collected by the measuring module meets the requirement, a control valve unit in a liquid ammonia conveying pipeline system is controlled to be opened by a control module, after the control valve is confirmed to be opened, a liquid ammonia conveying power unit is controlled to be opened by the control module, and liquid ammonia is supplied to a dual-medium ultra-large-capacity liquid ammonia evaporator through a liquid ammonia conveying pipeline until the liquid ammonia is started;
s4, when the liquid level signal of the double-medium ultra-large-capacity liquid ammonia evaporator collected by the measuring module meets the requirement, a control valve unit of the circulating water conveying pipeline system is controlled by the control module to be opened for liquid ammonia evaporation;
s5, judging whether the steam pipeline system is put into the ammonia gas pipeline system or not according to the ammonia gas pipeline temperature signal acquired by the measuring module, and controlling a control valve unit of the steam pipeline system and the like to be opened through the control module if the steam pipeline system is required to be put into the ammonia gas pipeline system;
and S6, when the pressure signal acquired by the measuring module after the ammonia conveying pipeline control valve unit meets the requirement, the control module controls the control valve unit of the ammonia conveying pipeline system to be opened, so that the conversion of the liquid ammonia into the ammonia is completed and the ammonia fuel is provided for the boiler ammonia burner.
In the invention, the control module also acquires a liquid level signal of the double-medium ultra-large-capacity liquid ammonia evaporator through the measuring module, the control module maintains the liquid level of the double-medium ultra-large-capacity liquid ammonia evaporator to be near a set value through the executing module, the control module also acquires an ammonia pressure signal of an ammonia conveying pipeline system through the measuring module, the control module maintains the pressure signal to be near the set value through the executing module, the control module also acquires a temperature signal of the ammonia conveying pipeline system through the measuring module, and the control module maintains the temperature signal to be near the set value through the executing module.
In the invention, the control module also acquires a tripping signal, and when the tripping signal is acquired, the control module controls the control valve unit and the liquid ammonia conveying power unit in the liquid ammonia conveying pipeline system to be closed.
According to the invention, the control module also obtains the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator, and when the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator reaches a set upper limit threshold value, the control module controls a control valve unit in the deluge control system to be opened, and the control module generates an alarm driving signal.
And all that is not described in detail in this specification is well known to those skilled in the art.
The control method of the double-medium ultra-large-capacity liquid ammonia evaporator specifically comprises the following embodiments:
example 1
The device is used for a dual-medium ultra-large-capacity liquid ammonia evaporator 1, wherein the dual-medium ultra-large-capacity liquid ammonia evaporator 1 is provided with a liquid ammonia conveying pipeline system, a circulating water conveying pipeline system, a steam conveying pipeline system and an ammonia zone conveying pipeline system, and the liquid ammonia conveying pipeline system is used for conveying liquid ammonia to the dual-medium ultra-large-capacity liquid ammonia evaporator 1; the circulating water conveying system is used for conveying heat exchange medium-water into the double-medium ultra-large-capacity liquid ammonia evaporator 1 to evaporate liquid ammonia; the steam delivery pipeline system is used for delivering high-temperature steam into the dual-medium ultra-large-capacity liquid ammonia evaporator 1, evaporating liquid ammonia and improving ammonia stability (being applicable to low ambient temperature in winter), and the ammonia delivery pipeline system is used for providing ammonia for the burner after the dual-medium ultra-large-capacity liquid ammonia evaporator 1 evaporates ammonia.
The embodiment comprises a control module, a measuring module, an executing module, a relay action module, an alarm module, a field monitoring module and a manual module, wherein:
the control module is used for receiving the signals collected by the measurement module, controlling the execution module to work through the relay action module and controlling the alarm module to work.
The execution module comprises an electric valve 2 at the inlet of a liquid ammonia delivery pump, a liquid ammonia delivery pump 3, an ammonia supply stop valve 4 of a liquid ammonia pipeline and an ammonia supply regulating valve 5 of the liquid ammonia pipeline in a liquid ammonia delivery pipeline system, and comprises an electric stop valve 6 at the inlet of circulating water in a circulating water delivery pipeline system, an electric stop valve 7 at the steam inlet of the steam delivery pipeline system and an electric regulating valve 8 at the steam inlet of the steam delivery pipeline system, and an electric regulating valve 9 at the outlet of ammonia gas in the ammonia delivery pipeline system, wherein each valve in each delivery pipeline system is respectively used as a control valve unit, the voltage output end of the controller is connected with a relay coil of a relay action module, the contact of the relay coil of the relay action module is connected to each valve to the electric input end of the pump, and therefore the controller controls the work of each valve and the pump through controlling the on-off of the relay coil, and the execution module also comprises a site safety action valve 30.
The measuring module comprises a liquid ammonia delivery pipeline system liquid ammonia delivery pump inlet pressure transmitter 10 and a liquid ammonia delivery pump outlet pressure transmitter 11, a circulating water delivery pipeline system circulating water inlet thermal resistance temperature original 12 and a circulating water backwater flowmeter 13, a steam delivery pipeline system steam inlet thermal resistance temperature original 14, a steam inlet pressure transmitter 15, a steam inlet flowmeter 16 and a steam backwater thermal resistance temperature original 17, an ammonia delivery pipeline system ammonia regulating valve front thermal resistance temperature original 18 and an ammonia regulating valve rear pressure transmitter 19, a dual-medium ultra-large-capacity liquid ammonia evaporator body evaporator top ammonia pressure transmitter 20, an evaporator bottom liquid ammonia thermal resistance temperature original 21, a dual-medium ultra-large-capacity liquid ammonia evaporator liquid level meter 22, an ammonia storage tank liquid ammonia level meter 23 and a toxic gas detection device 41.
The liquid ammonia delivery pump inlet pressure transmitter 10 collects the liquid ammonia delivery pump inlet real-time pressure for monitoring personnel value reference and applies to the liquid ammonia delivery pump protection stop logic (protection fixed value is higher than limit high pressure set value), the liquid ammonia delivery pump outlet pressure transmitter 11 collects the liquid ammonia delivery pump outlet real-time pressure for monitoring personnel value reference and applies to the liquid ammonia delivery pump protection stop logic (protection fixed value is higher than limit high pressure set value), the circulating water inlet thermal resistance temperature element 12 of the circulating water delivery pipeline system collects the circulating water delivery pipeline inlet temperature and applies to monitoring personnel value reference and judges whether to input the double medium ultra-large capacity liquid ammonia evaporator steam system (temperature is lower than a certain temperature value), the circulating water backwater flowmeter 13 collects circulating water flow to be applied to monitoring personnel reference and applies to the internal pressure control of the double medium ultra-large capacity liquid ammonia evaporator (evaporation speed is higher as flow is higher), the internal pressure of the evaporator can be controlled through the flow), the steam inlet thermal resistance temperature element 14 collects steam inlet temperature for the numerical reference of the prison, the steam inlet pressure transmitter 15 collects steam inlet pressure for the numerical reference of the prison, the steam inlet flow meter 16 collects steam inlet flow for the numerical reference of the prison, the steam backwater thermal resistance temperature element 17 collects steam heat exchange, the temperature is applied to the numerical reference of the prison, the thermal resistance temperature element 18 collects ammonia gas pipeline temperature for the numerical reference of the prison and for the regulation of the steam pipeline regulating valve (controlling the ammonia gas outlet temperature to be near the set temperature value), the pressure transmitter 19 collects the ammonia pressure after the ammonia regulating valve and applies to the monitoring staff value reference and applies to the ammonia regulating valve regulation (controls the ammonia pressure near the set pressure value), the ammonia pressure transmitter 20 at the top of the dual medium ultra-large capacity liquid ammonia evaporator body evaporator collects the dual medium ultra-large capacity liquid ammonia evaporator internal pressure and applies to the monitoring staff value reference and applies to the liquid ammonia pump protection stop logic (liquid ammonia lower than the limit low liquid level setting value) according to the flow rate of the pressure regulating circulating water, the evaporator bottom liquid ammonia thermal resistance temperature original 21 collects the dual medium ultra-large capacity liquid ammonia evaporator internal liquid ammonia temperature and applies to the monitoring staff value reference, the dual medium ultra-large capacity liquid ammonia evaporator liquid level meter 22 collects the dual medium ultra-large capacity liquid ammonia liquid evaporator internal liquid ammonia liquid level for the monitoring staff value reference and applies to the liquid ammonia conveying pipeline inlet regulating valve regulation (liquid level control is at the set liquid level value), the liquid ammonia conveying pipeline inlet stop valve protection stop logic (liquid level is higher than the limit high liquid level setting value), the liquid ammonia storage tank liquid ammonia level meter 23 collects the liquid ammonia storage tank liquid ammonia value and applies to the monitoring staff value reference and applies to the liquid ammonia conveying pump protection stop logic (liquid ammonia lower than the limit low liquid ammonia liquid level setting value), and the liquid ammonia level detector 41 and the liquid ammonia concentration detector is applied to the ammonia concentration control system near the ammonia concentration control system is applied to the ammonia concentration level control system.
The on-site monitoring module is used for being used as an on-site monitoring and partial measuring module to produce the examination value, and comprises a liquid ammonia pump inlet thermometer 24, a liquid ammonia pump outlet pressure gauge 25, a circulating water inlet pressure gauge 26, a circulating water outlet thermometer 27, a double-medium ultra-large-capacity liquid ammonia evaporator body liquid ammonia evaporator top pressure gauge 28 and a double-medium ultra-large-capacity liquid ammonia evaporator on-site liquid level gauge 29.
The manual module comprises a manual valve 31 of a liquid ammonia conveying pipeline system, so that the liquid ammonia can be circulated/blocked for checking related equipment of the system and the system can be operated/stopped; a liquid ammonia pump outlet circulation manual valve 32 which circulates liquid ammonia from the liquid ammonia pump outlet to each liquid ammonia storage tank after being opened, thereby preventing the overpressure of the liquid ammonia pipeline; a liquid ammonia discharge manual valve 33 for discharging residual liquid ammonia from the liquid ammonia pipeline when the system is overhauled and stopped; a liquid ammonia pipeline liquid ammonia replacement manual valve 34 for liquid ammonia pipeline gas replacement, comprising a circulating water conveying pipeline system manual valve 35, which enables circulating water to circulate/block for system related equipment inspection and system operation/stop; a manual valve 36 for accident water discharge of the circulating water, which is used for performing accident water discharge when the internal circulating water pipeline of the double-medium ultra-large-capacity liquid ammonia evaporator is broken to bring liquid ammonia into the circulating water pipeline, and comprises a manual valve 37 of a steam conveying system, so that the steam circulation/blocking is used for checking related equipment of the system and running/stopping the system; steam pipe drain valve 38 for venting the heating pipe and draining water to prevent pipe vibration; including an ammonia delivery plumbing manual valve 39 to allow/block circulation of water for system related equipment checks and system operation/shut down; the manual valve 40 for discharging the liquid ammonia of the dual-medium ultra-large-capacity liquid ammonia evaporator body is used for discharging residual liquid ammonia in the dual-medium ultra-large-capacity liquid ammonia evaporator when the system is overhauled and stopped.
The alarm module comprises an audible and visual alarm and a vibrator, and contacts of the relay action module relay are connected with the audible and visual alarm and an electric input end of the vibrator, so that the controller controls the audible and visual alarm and the vibrator to work by controlling the on-off of a relay coil.
Example two
When the inlet pressure 10 of the liquid ammonia delivery pump with higher ambient temperature in summer is larger than a certain pressure, the liquid ammonia delivery pump 3 is not required to be started, and the following steps are included:
step 1, checking before putting into a dual-medium ultra-large-capacity liquid ammonia evaporator system, checking that a manual valve 31 of a liquid ammonia conveying pipeline system is fully opened, wherein 31-6/31-7 is in a closed state, checking that a circulation manual valve 32 of a liquid ammonia pump outlet is opened for a certain opening degree, checking that a liquid ammonia pipeline liquid ammonia discharge manual valve 33 is fully in a closed state, a liquid ammonia pipeline liquid ammonia replacement manual valve 34 is fully in a closed state, a circulating water conveying pipeline system manual valve 35 is in a fully opened state, an ammonia conveying pipeline system manual valve 39 is in a fully opened state, a liquid ammonia discharge manual valve 40 of a dual-medium ultra-large-capacity liquid ammonia evaporator body is in a fully closed state, and confirming that all remote transmission measuring points are not abnormal and liquid ammonia storage tank liquid level is met.
Step 2, the heating pipe of the steam conveying pipeline is treated for standby, the manual valve 37 of the steam conveying system is opened at a small opening degree, and the drain valve 38 of the steam conveying pipeline is fully opened.
And 3, after the step 1 and the step 2 are confirmed to be finished, opening an inlet electric valve 2 of the liquid ammonia conveying pump, an ammonia supply stop valve 4 of the liquid ammonia pipeline and an ammonia supply regulating valve 5 of the liquid ammonia pipeline to a certain opening degree.
And 4, slowly starting a manual valve 31-6/31-7 of a liquid ammonia conveying pipeline system after starting the liquid ammonia conveying pump 3, and observing the liquid level collected by the liquid ammonia evaporator liquid level meter 22 with double medium and super large capacity.
Step 5, after the liquid level collected by the liquid level meter 22 of the dual-medium ultra-large-capacity liquid ammonia evaporator reaches a set pressure, opening the electric stop valve 6 of the circulating water inlet to enable circulating water to enter the dual-medium ultra-large-capacity liquid ammonia evaporator 1 for liquid ammonia evaporation, and observing the pressure collected by the ammonia pressure transmitter 20 at the top of the evaporator and the temperature collected by the thermal resistance temperature element 18 in front of the ammonia regulating valve; judging whether the ammonia gas needs to be put into a steam system for heating the ammonia gas according to the temperature acquired by the thermal resistance temperature element 18 before the ammonia gas regulating valve, if the ammonia gas needs to be put into the steam system for carrying out the step 5-1, and if the ammonia gas does not need to be put into the steam system for carrying out the step 6;
and 5-1, closing a steam pipeline drain valve 38, opening a steam inlet electric stop valve 7 and slowly opening a steam inlet electric regulating valve 8, and controlling the temperature collected by a thermal resistance temperature element 18 in front of an ammonia regulating valve to be near a set temperature value.
And 6, when the pressure acquired by the ammonia pressure transmitter 20 at the top of the evaporator is greater than a certain pressure, opening the ammonia outlet electric regulating valve 9 of the ammonia conveying pipeline system, and controlling the pressure acquired by the pressure transmitter 19 behind the ammonia regulating valve to be near a set pressure value.
And 7, after the system is stable, controlling and inputting the ammonia supply regulating valve 5 and the ammonia outlet electric regulating valve 9 of the liquid ammonia pipeline automatically and completing the input of a valve control loop control set value.
After the steps 1 to 7 are completed, the double-medium ultra-large-capacity liquid ammonia evaporator system is put into operation.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a control system of two medium super capacity liquid ammonia evaporators, includes measurement module, control module, execution module, relay module, ammonia concentration detection module and alarm module, its characterized in that: the measuring module is used for collecting the pressure of the liquid ammonia conveyed by the liquid ammonia conveying pipeline system, the flow rate and the temperature of the circulating water conveyed by the circulating water conveying pipeline system, the pressure and the temperature of the steam conveyed by the steam conveying pipeline system, the pressure and the temperature of the ammonia conveyed by the ammonia conveying pipeline system and the pressure and the temperature on the dual-medium ultra-large-capacity liquid ammonia evaporator body, and the measuring module is electrically connected with the control module through signal transmission;
the execution module comprises a control valve unit arranged in the liquid ammonia conveying pipeline system, a power unit, a control valve unit arranged in the circulating water conveying pipeline system, a control valve unit arranged in the steam conveying pipeline system and a control valve unit arranged in the ammonia conveying pipeline system, and the control module is respectively and electrically connected with each control valve unit and the liquid ammonia conveying power unit.
2. The control system of the dual-medium ultra-large-capacity liquid ammonia evaporator according to claim 1, wherein the control system comprises the following components: the control module is respectively and electrically connected with each control valve unit through the relay module and the liquid ammonia conveying power unit.
3. The control system of the dual-medium ultra-large-capacity liquid ammonia evaporator according to claim 1, wherein the control system comprises the following components: the ammonia concentration detection module is used for collecting the ammonia concentration around the dual-medium ultra-large-capacity liquid ammonia evaporator, the ammonia concentration detection module is electrically connected with the control module through signal transmission, and the control module is electrically connected with the alarm module.
4. A control system of a dual medium ultra-large capacity liquid ammonia evaporator according to any one of claims 1-3, characterized in that: the control method specifically comprises the following steps:
s1, exhausting gas through a liquid ammonia pipeline, draining water through a steam pipeline, and performing heating pipe treatment;
s2, the control module firstly judges whether a liquid ammonia conveying pipeline system, a circulating water conveying pipeline system, a steam conveying pipeline system, an ammonia conveying pipeline system and a double-medium ultra-large-capacity liquid ammonia evaporator body meet the requirements of liquid ammonia conveying and evaporation based on signals acquired by the measurement module;
s3, when the liquid level signal of the liquid ammonia storage tank collected by the measuring module meets the requirement, a control valve unit in a liquid ammonia conveying pipeline system is controlled to be opened by a control module, after the control valve is confirmed to be opened, a liquid ammonia conveying power unit is controlled to be opened by the control module, and liquid ammonia is supplied to a dual-medium ultra-large-capacity liquid ammonia evaporator through a liquid ammonia conveying pipeline until the liquid ammonia is started;
s4, when the liquid level signal of the double-medium ultra-large-capacity liquid ammonia evaporator collected by the measuring module meets the requirement, a control valve unit of the circulating water conveying pipeline system is controlled by the control module to be opened for liquid ammonia evaporation;
s5, judging whether the steam pipeline system is put into the ammonia gas pipeline system or not according to the ammonia gas pipeline temperature signal acquired by the measuring module, and controlling a control valve unit of the steam pipeline system and the like to be opened through the control module if the steam pipeline system is required to be put into the ammonia gas pipeline system;
and S6, when the pressure signal acquired by the measuring module after the ammonia conveying pipeline control valve unit meets the requirement, the control module controls the control valve unit of the ammonia conveying pipeline system to be opened, so that the conversion of the liquid ammonia into the ammonia is completed and the ammonia fuel is provided for the boiler ammonia burner.
5. The control method of the dual-medium ultra-large-capacity liquid ammonia evaporator according to claim 4, wherein the control method comprises the following steps: the control module further obtains a liquid level signal of the double-medium ultra-large-capacity liquid ammonia evaporator through the measuring module, the control module enables the liquid level of the double-medium ultra-large-capacity liquid ammonia evaporator to be maintained to be close to a set value through the executing module, the control module further obtains an ammonia pressure signal of an ammonia conveying pipeline system through the measuring module, the control module enables the pressure signal to be maintained to be close to the set value through the executing module, the control module further obtains a temperature signal of the ammonia conveying pipeline system through the measuring module, and the control module enables the temperature signal to be maintained to be close to the set value through the executing module.
6. The control method of the dual-medium ultra-large-capacity liquid ammonia evaporator according to claim 4, wherein the control method comprises the following steps: the control module also acquires a tripping signal, and controls a control valve unit in the liquid ammonia conveying pipeline system and a liquid ammonia conveying power unit to be closed when the tripping signal is acquired.
7. The control method of the dual-medium ultra-large-capacity liquid ammonia evaporator according to claim 4, wherein the control method comprises the following steps: the control module also obtains the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator, and when the ammonia concentration around the double-medium ultra-large-capacity liquid ammonia evaporator reaches a set upper limit threshold value, the control module controls a control valve unit in the deluge control system to be opened, and the control module generates an alarm driving signal.
CN202311127333.6A 2023-09-01 2023-09-01 Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator Pending CN116989259A (en)

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CN202311127333.6A CN116989259A (en) 2023-09-01 2023-09-01 Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator

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CN202311127333.6A CN116989259A (en) 2023-09-01 2023-09-01 Control system and method for double-medium ultra-large-capacity liquid ammonia evaporator

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CN116989259A true CN116989259A (en) 2023-11-03

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