CN116792777B - Boiler adulterated ammonia combustion sequence control system - Google Patents
Boiler adulterated ammonia combustion sequence control system Download PDFInfo
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- CN116792777B CN116792777B CN202310595787.XA CN202310595787A CN116792777B CN 116792777 B CN116792777 B CN 116792777B CN 202310595787 A CN202310595787 A CN 202310595787A CN 116792777 B CN116792777 B CN 116792777B
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 735
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 355
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 114
- 238000010926 purge Methods 0.000 claims abstract description 100
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 42
- 239000000523 sample Substances 0.000 claims description 15
- 239000003245 coal Substances 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 10
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 8
- 230000000007 visual effect Effects 0.000 claims description 8
- 239000003063 flame retardant Substances 0.000 claims description 7
- 238000010408 sweeping Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 24
- 230000006872 improvement Effects 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to the technical field of boiler adulterated ammonia combustion, in particular to a boiler adulterated ammonia combustion sequence control system. The device comprises a measuring module, a control module and an execution module, wherein the measuring module is used for collecting the flow, pressure and temperature of ammonia, the flow, pressure and temperature of combustion-supporting air, the pressure and temperature of purging steam and fire detection signals of an ammonia burner in a boiler, and the measuring module is electrically connected with the control module; the execution module comprises a control valve unit and an igniter control unit of the ammonia burner, and the control module is respectively and electrically connected with the control valve units and the igniter control unit in a control manner; the control module judges whether the combustion starting condition is met or not based on the signals collected by the measurement module, and sequentially controls the ignition of the boiler ammonia burner when the combustion starting condition is met, so that the intelligent automatic sequential control of the boiler ammonia-doped combustion can be realized, and the operation of operators and the risks brought by the operation personnel are reduced.
Description
Technical Field
The invention relates to the technical field of boiler adulterated ammonia combustion, in particular to a boiler adulterated ammonia combustion sequence control system.
Background
Ammonia is 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, and is considered to be a more potential clean fuel. Ammonia is used as a substitute of fossil fuel, and the equivalent heat value replaces part of fossil fuel to enter a boiler for co-combustion, so that carbon emission can be effectively reduced.
At present, energy research of a national science center of comprehensive national sources of smoke and fertilizer is carried out on the large scale of boiler adulteration combustion in China, and a 40MW industrial boiler adulteration combustion test and a 300MW power station boiler adulteration combustion test are respectively carried out, so that the feasibility of the coal-fired boiler adulteration combustion technical route is verified. However, the existing ammonia-doped boiler combustion sequence control is manually executed, and the risk of error is high. In order to realize the engineering application of the subsequent coal-fired boiler adulterated ammonia combustion, improve the automation of the adulterated combustion process, the starting safety and the starting efficiency, and develop an automatic control system of the boiler adulterated ammonia combustion.
Disclosure of Invention
The invention aims to provide a boiler ammonia-doped combustion sequence control system for solving the problems in the background technology.
In order to achieve the above purpose, a boiler adulterated ammonia combustion sequence control system is provided, which comprises an ammonia burner, an ammonia gas conveying pipeline system, a combustion air conveying pipeline system, a sweeping steam conveying pipeline system, a measuring module, a control module and an executing module, wherein:
The ammonia conveying pipeline system comprises an ammonia supply mother pipe and a plurality of ammonia branch pipelines, wherein the ammonia supply mother pipe and the ammonia branch pipelines are used for supplying ammonia to the ammonia burner, the input end of the ammonia supply mother pipe is connected with an ammonia buffer tank, and the input end of the ammonia buffer tank is connected with an ammonia input pipe for inputting ammonia;
the combustion-supporting air conveying pipeline system comprises an air supply pipeline, and the air supply pipeline is used for conveying combustion-supporting air to the ammonia burner;
the purging steam conveying pipeline system comprises a purging air supply pipeline, and the purging air supply pipeline is used for conveying purging steam into the ammonia combustor;
The measuring module is used for collecting the flow, pressure and temperature of the ammonia gas conveyed by the ammonia gas conveying pipeline system; the measuring module is used for collecting flow, pressure and temperature of combustion air conveyed by the combustion air conveying pipeline system, the measuring module is used for collecting pressure and temperature of steam conveyed by the purging steam conveying pipeline system, the measuring module is also used for collecting fire detection signals of the ammonia burner, and the measuring module is electrically connected with the control module through signal transmission;
The execution module comprises an ammonia control valve unit arranged in an ammonia conveying pipeline system, a combustion air control valve unit arranged in a combustion air conveying pipeline system, a steam control valve unit arranged in a sweeping steam conveying pipeline system and an igniter control unit arranged in the ammonia burner, and the control module is respectively and electrically connected with the ammonia control valve unit, the combustion air control valve unit, the steam control valve unit and the igniter control unit in a control mode.
As a further improvement of the technical scheme, the ammonia gas control valve unit comprises an ammonia supply main pipe control valve, an ammonia supply main pipe stop valve, a pair of ammonia supply manual valves, a pneumatic ammonia supply regulating valve, an electric ammonia supply emergency stop valve and a flame retardant, wherein the ammonia supply main pipe control valve, the ammonia supply main pipe stop valve and one of the ammonia supply manual valves are sequentially arranged on the ammonia supply main pipe according to the flow direction of ammonia gas, and the pneumatic ammonia supply regulating valve, the electric ammonia supply emergency stop valve, the other ammonia supply manual valve and the flame retardant are sequentially arranged on the ammonia gas branch pipe according to the flow direction of ammonia gas;
the ammonia supply main pipe control valve, the ammonia supply main pipe stop valve and one of the ammonia supply manual valves are used for regulating and controlling the ammonia input quantity of the ammonia supply main pipe;
the pneumatic ammonia supply regulating valve and the electric ammonia supply emergency stop valve are used for regulating and controlling the ammonia input end in the ammonia branch pipeline.
As a further improvement of the technical scheme, the steam control valve unit comprises an electric valve, an electric steam purge valve and a check valve;
The electric valve, the electric steam purge valve and the check valve are sequentially arranged on the purge gas pipeline according to the steam purge flow direction;
The electric valve, the electric steam purge valve and the check valve are used for adjusting the steam input quantity supplied by the supply and purge air pipeline to the ammonia burner and realizing a steam supply switch function.
As a further improvement of the technical scheme, the combustion-supporting air control valve unit comprises an electric stop valve and a combustion-supporting air regulating valve;
The electric stop valve and the combustion-supporting air regulating valve are sequentially arranged on the air supply pipeline according to the flowing direction of the combustion-supporting air, regulate and control the input quantity of the combustion-supporting air supplied by the air supply pipeline into the ammonia burner, and realize the function of opening light of the input combustion-supporting air.
As a further improvement of the technical scheme, the measuring module comprises an ammonia supply main pipe pressure transmitter, an integrated flowmeter, a combustion air volume flowmeter, a combustion air pressure transmitter, a thermocouple for measuring the combustion air, a purge air pressure transmitter, a thermocouple for measuring the purge air, a temperature measuring element, a fire detection probe and a pair of ammonia leakage detectors;
the ammonia supply main pipe pressure transmitter is additionally arranged on the ammonia supply main pipe, and is positioned between the ammonia supply main pipe stop valve and the ammonia supply manual valve, and is used for collecting the ammonia pressure in the ammonia supply main pipe;
the integrated flowmeter is additionally arranged on the ammonia branch pipeline and is used for collecting the pressure, the temperature and the flow of the ammonia conveyed to the ammonia burner;
The combustion-supporting air flow meter, the combustion-supporting air pressure transmitter and the thermocouple for measuring the combustion-supporting air are additionally arranged on the air supply pipeline, the combustion-supporting air flow meter, the combustion-supporting air pressure transmitter and the thermocouple for measuring the combustion-supporting air are positioned between the combustion-supporting air regulating valve and the ammonia burner, the combustion-supporting air flow meter is used for collecting the flow of the combustion-supporting air conveyed to the ammonia burner, the combustion-supporting air pressure transmitter is used for collecting the pressure of the combustion-supporting air conveyed to the ammonia burner, and the thermocouple for measuring the combustion-supporting air is used for collecting the temperature of the combustion-supporting air conveyed to the ammonia burner;
The purging gas pressure transmitter and the purging gas measuring thermocouple are additionally arranged on the purging gas supply pipeline, the purging gas pressure transmitter and the purging gas measuring thermocouple are positioned at the gas inlet end of the purging gas supply pipeline, the purging gas pressure transmitter is used for collecting the pressure of purging steam conveyed to the ammonia burner, and the purging gas measuring thermocouple is used for collecting the temperature of the purging steam conveyed to the ammonia burner;
the temperature measuring element and the fire detection probe are arranged at the inner end of the ammonia burner and are respectively used for collecting the temperature and the fire detection signal in the ammonia burner;
the two ammonia leakage detectors are respectively arranged around the ammonia supply main pipe and around the ammonia burner, and are respectively used for collecting the ammonia concentration around the ammonia supply main pipe and around the ammonia burner;
The measuring module is used for recording collected signals provided by an ammonia supply main pipe pressure transmitter, an integrated flowmeter, a combustion-supporting air volume flowmeter, a combustion-supporting air pressure transmitter, a thermocouple for measuring combustion-supporting air, a purging air pressure transmitter, a thermocouple for measuring purging air, a temperature measuring element, a fire detecting probe and a pair of ammonia leakage detectors, and transmitting the collected signals to the control module.
As a further improvement of the technical scheme, the execution module further comprises a relay module, the relay module is in control electric connection with the control module, the relay module is in control electric connection with the ammonia control valve unit, the combustion air control valve unit, the steam control valve unit and the igniter control unit, and the control module controls the execution module to work through the relay module after receiving the collected signals.
As a further improvement of the technical scheme, the control module adopts a OVATION controller, the input end of the OVATION controller is electrically connected with the ammonia supply main pipe pressure transmitter, the integrated flowmeter, the combustion air volume flowmeter, the combustion air pressure transmitter, the combustion air measuring thermocouple, the purging air pressure transmitter, the purging air measuring thermocouple, the temperature measuring element, the fire detecting probe and the pair of ammonia leakage detectors, a relay coil and a plurality of relays are arranged in the relay module for electric shock, the voltage output end of the OVATION controller is connected with the relay coil arranged in the relay module, and the contacts of the relay module relay are connected to the ammonia supply main pipe control valve, the ammonia supply main pipe stop valve, the pair of ammonia supply manual valves, the pneumatic ammonia supply regulating valves, the electric ammonia supply emergency stop valve, the electric steam purging valve, the check valve, the electric stop valve, the electric air regulating valve and the electric input end of the igniter control unit.
As a further improvement of the technical scheme, the control module is electrically connected with an ammonia concentration detection module and an alarm module, the ammonia concentration detection module is used for collecting ammonia concentration data recorded by the ammonia leakage detector, the alarm module comprises an audible-visual annunciator and a vibrator, contacts of a relay of the relay module are connected with electric input ends of the audible-visual annunciator and the vibrator, and the OVATION controller controls the audible-visual annunciator and the vibrator to work by controlling the on-off of a relay coil.
As a further improvement of the technical scheme, the control module obtains the flow of the combustion-supporting air conveyed by the air supply pipeline and the flow of the ammonia conveyed by the ammonia conveying pipeline system through the measuring module, and the control module enables the flow of the combustion-supporting air and the flow of the ammonia to be kept in an adjustable range through the executing module.
As a further improvement of the technical scheme, the control module obtains the ammonia flow rate conveyed by the ammonia branch pipeline through the measurement module to obtain an ammonia flow rate value, the ammonia flow rate value is conveyed to the boiler fuel control system, and the control module enables the ammonia amount, the boiler coal feeding amount and the fuel air amount to realize automatic proportioning linkage control through the execution module.
Compared with the prior art, the invention has the beneficial effects that:
In the boiler ammonia-doped combustion sequence control system, the flow, pressure and temperature of ammonia gas, the flow, pressure and temperature of combustion-supporting air, the pressure and temperature of purging steam and a fire detection signal of an ammonia burner in the boiler are collected through a measurement module, and the measurement module is electrically connected with a control module; the execution module comprises a control valve unit and an igniter control unit of the ammonia burner, and the control module is respectively and electrically connected with the control valve units and the igniter control unit in a control manner; the control module judges whether the combustion starting condition is met or not based on the signals collected by the measurement module, and sequentially controls the ignition of the boiler ammonia burner when the combustion starting condition is met, so that the intelligent automatic sequential control of the boiler ammonia-doped combustion can be realized, and the operation of operators and the risks brought by the operation personnel are reduced.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
fig. 2 is a schematic diagram of the present invention.
The meaning of each reference sign in the figure is:
1. an ammonia burner; 2. an ammonia supply main pipe control valve; 3. an ammonia supply main pipe stop valve; 4. an ammonia supply manual valve; 5. a pneumatic ammonia supply regulating valve; 6. an electric ammonia supply emergency stop valve; 7. a flame retardant; 8. an electric shut-off valve; 9. a combustion-supporting air regulating valve; 10. an electric valve; 11. an electric steam purge valve; 12. a non-return valve; 13. an ammonia supply main pressure transmitter; 14. an integrated flowmeter; 15. a combustion-supporting air flow meter; 16. a combustion air pressure transmitter; 17. a purge gas pressure transmitter; 18. an ammonia leakage detector; 19. thermocouple for measuring combustion air; 20. thermocouple for measuring purge gas;
a1, an ammonia supply main pipe; a2, an ammonia branch pipeline;
B. A purge gas line;
C. And an air supply pipeline.
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. 1-2, a boiler ammonia blending combustion sequence control system is provided, which comprises an ammonia burner 1, an ammonia gas conveying pipeline system, a combustion air conveying pipeline system, a purge steam conveying pipeline system, a measuring module, a control module and an executing module, wherein:
the ammonia conveying pipeline system comprises an ammonia supply main pipe A1 and a plurality of ammonia branch pipelines A2, wherein the ammonia supply main pipe A1 and the ammonia branch pipelines A2 are used for supplying ammonia to the ammonia burner 1, the input end of the ammonia supply main pipe A1 is connected with an ammonia buffer tank, and the input end of the ammonia buffer tank is connected with an ammonia input pipe for inputting ammonia;
The combustion-supporting air conveying pipeline system comprises an air supply pipeline C, and the air supply pipeline C is used for conveying combustion-supporting air to the ammonia combustor 1;
The purge steam delivery pipeline system comprises a purge gas supply pipeline B for delivering purge steam into the ammonia combustor 1;
The measuring module is used for collecting the flow, pressure and temperature of the ammonia gas conveyed by the ammonia gas conveying pipeline system; the measuring module is used for collecting the flow, pressure and temperature of the combustion air conveyed by the combustion air conveying pipeline system, the measuring module is used for collecting the pressure and temperature of the steam conveyed by the purge steam conveying pipeline system, the measuring module is also used for collecting a fire detection signal of the ammonia burner 1, and the measuring module is electrically connected with the control module through signal transmission;
The execution module comprises an ammonia control valve unit arranged in the ammonia conveying pipeline system, a combustion air control valve unit arranged in the combustion air conveying pipeline system, a steam control valve unit arranged in the sweeping steam conveying pipeline system and an igniter control unit arranged in the ammonia combustor 1, and the control module is respectively and electrically connected with the ammonia control valve unit, the combustion air control valve unit, the steam control valve unit and the igniter control unit in a control manner;
The ammonia control valve unit comprises an ammonia supply main pipe control valve 2, an ammonia supply main pipe stop valve 3, a pair of ammonia supply manual valves 4, a pneumatic ammonia supply regulating valve 5, an electric ammonia supply emergency stop valve 6 and a flame retardant 7, wherein the ammonia supply main pipe control valve 2, the ammonia supply main pipe stop valve 3 and one ammonia supply manual valve 4 are sequentially arranged on an ammonia supply main pipe A1 according to the flowing direction of ammonia, and the pneumatic ammonia supply regulating valve 5, the electric ammonia supply emergency stop valve 6, the other ammonia supply manual valve 4 and the flame retardant 7 are sequentially arranged on an ammonia branch pipe A2 according to the flowing direction of ammonia;
the ammonia supply main pipe control valve 2, the ammonia supply main pipe stop valve 3 and one of the ammonia supply manual valves 4 are used for regulating and controlling the ammonia input quantity of the ammonia supply main pipe A1;
the pneumatic ammonia supply regulating valve 5 and the electric ammonia supply emergency stop valve 6 are used for regulating and controlling the ammonia input end in the ammonia branch pipeline A2;
The steam control valve unit includes an electric valve 10, an electric steam purge valve 11, and a check valve 12;
The electric valve 10, the electric steam purge valve 11 and the check valve 12 are sequentially arranged on the purge gas supply pipeline B according to the steam purge flow direction;
The electric valve 10, the electric steam purge valve 11 and the check valve 12 are used for adjusting the steam input amount supplied by the purge gas pipeline B into the ammonia burner 1 and realizing a steam supply switch function;
The combustion air control valve unit comprises an electric stop valve 8 and a combustion air regulating valve 9;
the electric stop valve 8 and the combustion air regulating valve 9 are sequentially arranged on the air supply pipeline C according to the flow direction of the combustion air, regulate and control the input quantity of the combustion air supplied by the air supply pipeline C into the ammonia burner 1, and realize the function of opening light of the input combustion air;
the measuring module comprises an ammonia supply main pipe pressure transmitter 13, an integrated flowmeter 14, a combustion air volume flowmeter 15, a combustion air pressure transmitter 16, a thermocouple 19 for measuring combustion air, a purge air pressure transmitter 17, a thermocouple 20 for measuring purge air, a temperature measuring element, a fire detection probe and a pair of ammonia leakage detectors 18;
The ammonia supply pipe pressure transmitter 13 is additionally arranged on the ammonia supply pipe A1, the ammonia supply pipe pressure transmitter 13 is positioned between the ammonia supply pipe stop valve 3 and the ammonia supply manual valve 4, and the ammonia supply pipe pressure transmitter 13 is used for collecting the ammonia pressure in the ammonia supply pipe A1;
an integrated flowmeter 14 is additionally arranged on the ammonia branch pipeline A2, and the integrated flowmeter 14 is used for collecting the pressure, the temperature and the flow of the ammonia conveyed to the ammonia burner 1;
The combustion air flow meter 15, the combustion air pressure transmitter 16 and the thermocouple 19 for measuring the combustion air are additionally arranged on the air supply pipeline C, the combustion air flow meter 15, the combustion air pressure transmitter 16 and the thermocouple 19 for measuring the combustion air are positioned between the combustion air regulating valve 9 and the ammonia burner 1, the combustion air flow meter 15 is used for collecting the flow of the combustion air conveyed to the ammonia burner 1, the combustion air pressure transmitter 16 is used for collecting the pressure of the combustion air conveyed to the ammonia burner 1, and the thermocouple 19 for measuring the combustion air is used for collecting the temperature of the combustion air conveyed to the ammonia burner 1;
the purge gas pressure transmitter 17 and the purge gas measuring thermocouple 20 are additionally arranged on the purge gas pipeline B, the purge gas pressure transmitter 17 and the purge gas measuring thermocouple 20 are positioned at the inlet end of the purge gas pipeline B, the purge gas pressure transmitter 17 is used for collecting the pressure of purge steam conveyed to the ammonia burner 1, and the purge gas measuring thermocouple 20 is used for collecting the temperature of the purge steam conveyed to the ammonia burner 1;
The temperature measuring element and the fire detection probe are arranged at the inner end of the ammonia burner 1 and are respectively used for collecting the temperature and the fire detection signal in the ammonia burner 1;
Two ammonia leakage detectors 18 are respectively arranged around the ammonia supply pipe A1 and around the ammonia burner 1, and the ammonia leakage detectors 18 are respectively used for collecting the ammonia concentration around the ammonia supply pipe A1 and around the ammonia burner 1;
the measuring module is used for recording collected signals provided by the ammonia supply main pipe pressure transmitter 13, the integrated flowmeter 14, the combustion air volume flowmeter 15, the combustion air pressure transmitter 16, the thermocouple 19 for measuring combustion air, the purge air pressure transmitter 17, the thermocouple 20 for measuring purge air, the temperature measuring element, the fire detection probe and the pair of ammonia leakage detectors 18, and transmitting the collected signals to the control module;
the execution module further comprises a relay module, the relay module is in control electric connection with the control module, the relay module is in control electric connection with the ammonia control valve unit, the combustion-supporting air control valve unit, the steam control valve unit and the igniter control unit, and the control module controls the execution module to work through the relay module after receiving the collected signals;
The control module adopts OVATION controller, the input end of OVATION controller is connected with ammonia supply main pipe pressure transmitter 13, integrated flowmeter 14, combustion air flow meter 15, combustion air pressure transmitter 16, combustion air measuring thermocouple 19, purge air pressure transmitter 17, purge air measuring thermocouple 20, temperature measuring element, fire detecting probe and pair of ammonia leakage detector 18, relay coil and a plurality of relay electric shocks are built in relay module, OVATION controller voltage output end is connected with relay coil built in relay module, relay module relay contacts are connected to ammonia supply main pipe control valve 2, ammonia supply main pipe stop valve 3, a pair of ammonia supply manual valves 4, pneumatic ammonia supply regulating valve 5, electric ammonia supply emergency stop valve 6, electric valve 10, electric steam purge valve 11, check valve 12, electric stop valve 8, air regulating valve 9 and igniter control unit electric input end, OVATION controller controls the work of each valve and igniter control unit by controlling relay coil built in relay module on and off;
The control module is electrically connected with an ammonia concentration detection module and an alarm module, the ammonia concentration detection module is used for collecting ammonia concentration data recorded by the two ammonia leakage detectors 18, the alarm module comprises an audible and visual alarm and a vibrator, contacts of a relay of the relay module are connected with the audible and visual alarm and an electric input end of the vibrator, and a OVATION controller controls the audible and visual alarm and the vibrator to work by controlling the on-off of a relay coil;
the control module obtains the flow of the combustion-supporting air conveyed by the air supply pipeline C and the flow of the ammonia conveyed by the ammonia conveying pipeline system through the measuring module, and the control module enables the flow of the combustion-supporting air and the flow of the ammonia to be kept in an adjustable range through the executing module.
The specific working steps are as follows:
step 1: the control module acquires signals collected by the ammonia feed header pressure transmitter 13, the integrated flowmeter 14, the combustion air volume flowmeter 15, the combustion air pressure transmitter 16, the thermocouple 19 for combustion air measurement, the purge air pressure transmitter 17, the thermocouple 20 for purge air measurement, the temperature measuring element, the fire detection probe and the ammonia leakage detector 18, judges whether the pressure of the ammonia gas in the ammonia feed header A1 is within a preset range, judges whether the pressure, the temperature and the flow rate of the ammonia gas delivered to the ammonia burner 1 are within a preset range, judges whether the flow rate of the combustion air delivered to the ammonia burner 1 is within a preset range, judges whether the temperature of the combustion air delivered to the ammonia burner 1 is within a preset range, judges whether the pressure of the purge steam delivered to the ammonia burner 1 is within a preset range, judges whether the temperature of the ammonia gas delivered to the ammonia burner 1 is within a preset range, and judges whether the temperature of the ammonia gas delivered to the ammonia burner 1 is within a preset range and the ambient ammonia feed header is within a preset range.
When the judging results are all within the preset range, the control module judges that the combustion starting requirement is met.
Step 2: the control module controls the electric valve 10, the electric steam purge valve 11 and the check valve 12 in the purge steam conveying pipeline system to be sequentially opened, the purge steam is conveyed into the ammonia burner 1, the purge is completed when the time of the purge steam is equal to the set time threshold, and the control module controls the electric valve 10, the electric steam purge valve 11 and the check valve 12 to be sequentially closed.
Step 3: the control module controls the electric stop valve 8 and the combustion-supporting air regulating valve 9 of the air supply pipeline C in the combustion-supporting air conveying pipeline system to be sequentially opened, and the combustion-supporting air is conveyed to the ammonia burner 1. And the control module controls the igniter control unit to enable the igniter to be ignited.
Then, the control module controls the ammonia supply main pipe control valve 2, the ammonia supply main pipe stop valve 3 and the ammonia supply manual valve 4 in the ammonia supply main pipe A1 of the combustion-supporting air conveying pipeline system, and the pneumatic ammonia supply regulating valve 5 and the electric ammonia supply emergency stop valve 6 in the ammonia branch pipeline A2 to be sequentially opened to convey ammonia into the ammonia burner 1, and the control module acquires signals acquired by the combustion-supporting air flow meter 15 and the integrated flow meter 14 in real time, and keeps the flow of the combustion-supporting air and the flow of the ammonia at 4:1 by controlling the combustion-supporting air regulating valve 9. Meanwhile, the control module acquires signals acquired by the fire detection probe in real time, judges whether ignition is successful or not based on the fire detection probe signals, and controls the igniter control unit to reset the igniter when the ignition is successful.
In the process of step 1-step 3, the control module also acquires a tripping signal of the ammonia burner 1, when the control module acquires the tripping signal, the control module controls the pneumatic ammonia supply regulating valve 5 and the electric ammonia supply emergency stop valve 6 of the ammonia branch pipeline A2 in the ammonia conveying pipeline system to be sequentially closed, and controls the electric valve 10, the electric steam purging valve 11 and the check valve 12 in the steam conveying pipeline system to be sequentially opened for purging again.
In the process of step 1-step 3 in this embodiment, the control module also acquires the ammonia concentration acquired by the ammonia leakage detector 18 in real time, and when the ammonia concentration reaches the set upper limit threshold, the control module controls the ammonia supply main pipe control valve 2, the ammonia supply main pipe stop valve 3 and the ammonia supply manual valve 4 of the ammonia supply main pipe A1 in the ammonia gas conveying pipeline system to be sequentially closed, and the pneumatic ammonia supply regulating valve 5 and the electric ammonia supply emergency stop valve 6 of the ammonia gas branch pipeline A2 to be sequentially closed. And the control module generates an alarm driving voltage signal to the relay coil of the relay module, so that the contacts corresponding to the audible and visual alarm and the vibrator are closed, and the audible and visual alarm and the vibrator work in an alarm mode.
The automatic proportioning linkage control introduction of the ammonia gas quantity, the boiler coal quantity and the fuel air quantity:
The embodiment is based on a fuel main control system and a boiler pulverized coal feeding amount control system in the existing boiler coordination control system of the coal-fired unit. a. And logically judging according to NOX emission of different load sections and coal-fired units to generate an ammonia-doped combustion ratio value. b. The ratio value is multiplied by the fuel main control coal feeding quantity set value through logic to obtain the required ammonia gas quantity value. c. The ammonia gas quantity value is used as a set value of a control system of the pneumatic ammonia supply regulating valve 5, the value measured by the integrated flowmeter 14 is used as a feedback value of the control system of the pneumatic ammonia supply regulating valve 5, the set value and the feedback value are logically judged to generate an opening instruction of the pneumatic ammonia supply regulating valve 5, and the instruction is transmitted to an on-site execution module through a control module to control the action of the pneumatic ammonia supply regulating valve 5; meanwhile, the ammonia gas quantity value is also applied to a boiler coal feeding quantity control system, a new boiler coal feeding quantity set value (calculation) is generated by logically subtracting the ammonia gas quantity value from a boiler coal feeding quantity set value, and the boiler coal feeding quantity set value (calculation) is applied to the boiler coal feeding quantity control system and replaces the original boiler coal feeding quantity set value. Through the mode, after the ammonia gas enters the hearth for combustion, the original coal feeding amount is reduced, and the balance of the fuel amount is realized. d. The ammonia quantity value generated by b is simultaneously used as a set value of a combustion-supporting air regulating valve 9 control system, and the set value is obtained by logically multiplying the ammonia quantity by the ammonia air ratio value.
Through the above, after the ammonia enters the hearth for combustion, the coal feeding amount of the original boiler is reduced, and the fuel air quantity is automatically proportioned and controlled in series according to the required ammonia amount.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. The utility model provides a boiler adulterated ammonia burning sequence control system which characterized in that includes ammonia combustor (1), the ammonia conveying pipeline system of configuration, combustion-supporting wind conveying pipeline system, sweeps steam conveying pipeline system, measurement module, control module and execution module, wherein:
The ammonia conveying pipeline system comprises an ammonia supply mother pipe (A1) and a plurality of ammonia branch pipelines (A2), wherein the ammonia supply mother pipe (A1) and the ammonia branch pipelines (A2) are used for supplying ammonia to the ammonia burner (1), the input end of the ammonia supply mother pipe (A1) is connected with an ammonia buffer tank, and the input end of the ammonia buffer tank is connected with an ammonia input pipe for inputting ammonia;
the combustion-supporting air conveying pipeline system comprises an air supply pipeline (C), wherein the air supply pipeline (C) is used for conveying combustion-supporting air to the ammonia combustor (1);
the purging steam conveying pipeline system comprises a purging air supply pipeline (B), wherein the purging air supply pipeline (B) is used for conveying purging steam into the ammonia combustor (1);
the measuring module is used for collecting the flow, pressure and temperature of the ammonia gas conveyed by the ammonia gas conveying pipeline system; the measuring module is used for collecting flow, pressure and temperature of combustion air conveyed by the combustion air conveying pipeline system, the measuring module is used for collecting pressure and temperature of steam conveyed by the purging steam conveying pipeline system, the measuring module is also used for collecting fire detection signals of the ammonia burner (1), and the measuring module is electrically connected with the control module through signal transmission;
The execution module comprises an ammonia control valve unit arranged in an ammonia conveying pipeline system, a combustion air control valve unit arranged in a combustion air conveying pipeline system, a steam control valve unit arranged in a sweeping steam conveying pipeline system and an igniter control unit arranged in the ammonia combustor (1), and the control module is respectively and electrically connected with the ammonia control valve unit, the combustion air control valve unit, the steam control valve unit and the igniter control unit in a control mode;
The ammonia control valve unit comprises an ammonia supply main pipe control valve (2), an ammonia supply main pipe stop valve (3), a pair of ammonia supply manual valves (4), a pneumatic ammonia supply regulating valve (5), an electric ammonia supply emergency stop valve (6) and a flame retardant (7), wherein the ammonia supply main pipe control valve (2), the ammonia supply main pipe stop valve (3) and one of the ammonia supply manual valves (4) are sequentially arranged on an ammonia supply main pipe (A1) according to the flowing direction of ammonia, and the pneumatic ammonia supply regulating valve (5), the electric ammonia supply emergency stop valve (6), the other ammonia supply manual valve (4) and the flame retardant (7) are sequentially arranged on an ammonia branch pipe (A2) according to the flowing direction of ammonia;
The ammonia supply main pipe control valve (2), the ammonia supply main pipe stop valve (3) and one of the ammonia supply manual valves (4) are used for regulating and controlling the ammonia input quantity of the ammonia supply main pipe (A1);
The pneumatic ammonia supply regulating valve (5) and the electric ammonia supply emergency stop valve (6) are used for regulating and controlling the ammonia input end in the ammonia branch pipeline (A2);
The steam control valve unit comprises an electric valve (10), an electric steam purge valve (11) and a check valve (12);
The electric valve (10), the electric steam purge valve (11) and the check valve (12) are sequentially arranged on the purge gas pipeline (B) according to the steam purge flow direction;
The electric valve (10), the electric steam purge valve (11) and the check valve (12) are used for adjusting the steam input quantity supplied by the purge gas supply pipeline (B) into the ammonia burner (1) and realizing a steam supply switch function;
The combustion-supporting air control valve unit comprises an electric stop valve (8) and a combustion-supporting air regulating valve (9);
the electric stop valve (8) and the combustion air regulating valve (9) are sequentially arranged on the air supply pipeline (C) according to the flow direction of the combustion air, regulate and control the input quantity of the combustion air supplied by the air supply pipeline (C) into the ammonia burner (1), and realize the function of inputting the combustion air;
The measuring module comprises an ammonia supply main pipe pressure transmitter (13), an integrated flowmeter (14), a combustion-supporting air volume flowmeter (15), a combustion-supporting air pressure transmitter (16), a thermocouple (19) for measuring combustion-supporting air, a purge air pressure transmitter (17), a thermocouple (20) for measuring purge air, a temperature measuring element, a fire detection probe and a pair of ammonia leakage detectors (18);
The ammonia supply main pipe pressure transmitter (13) is additionally arranged on the ammonia supply main pipe (A1), the ammonia supply main pipe pressure transmitter (13) is positioned between the ammonia supply main pipe stop valve (3) and the ammonia supply manual valve (4), and the ammonia supply main pipe pressure transmitter (13) is used for collecting the ammonia pressure in the ammonia supply main pipe (A1);
The integrated flowmeter (14) is additionally arranged on the ammonia branch pipeline (A2), and the integrated flowmeter (14) is used for collecting the pressure, the temperature and the flow of the ammonia conveyed to the ammonia burner (1);
The device comprises a combustion air flow meter (15), a combustion air pressure transmitter (16) and a thermocouple (19) for measuring combustion air, wherein the combustion air flow meter (15), the combustion air pressure transmitter (16) and the thermocouple (19) for measuring combustion air are additionally arranged on an air supply pipeline (C), the combustion air flow meter (15), the combustion air pressure transmitter (16) and the thermocouple (19) for measuring combustion air are positioned between a combustion air regulating valve (9) and an ammonia burner (1), the combustion air flow meter (15) is used for collecting combustion air flow transmitted to the ammonia burner (1), the combustion air pressure transmitter (16) is used for collecting combustion air pressure transmitted to the ammonia burner (1), and the thermocouple (19) for measuring combustion air temperature transmitted to the ammonia burner (1);
The purge gas pressure transmitter (17) and the purge gas measuring thermocouple (20) are additionally arranged on the purge gas supply pipeline (B), the purge gas pressure transmitter (17) and the purge gas measuring thermocouple (20) are positioned at the air inlet end of the purge gas supply pipeline (B), the purge gas pressure transmitter (17) is used for collecting the pressure of purge steam conveyed to the ammonia burner (1), and the purge gas measuring thermocouple (20) is used for collecting the temperature of the purge steam conveyed to the ammonia burner (1);
the temperature measuring element and the fire detection probe are arranged at the inner end of the ammonia burner (1) and are respectively used for collecting the temperature and the fire detection signal in the ammonia burner (1);
The two ammonia leakage detectors (18) are respectively arranged around the ammonia supply main pipe (A1) and around the ammonia burner (1), and the ammonia leakage detectors (18) are respectively used for collecting the ammonia concentration around the ammonia supply main pipe (A1) and around the ammonia burner (1);
The measuring module is used for recording collected signals provided by an ammonia supply main pipe pressure transmitter (13), an integrated flowmeter (14), a combustion air volume flowmeter (15), a combustion air pressure transmitter (16), a thermocouple (19) for measuring combustion air, a purge air pressure transmitter (17), a thermocouple (20) for measuring purge air, a temperature measuring element, a fire detection probe and a pair of ammonia leakage detectors (18), and transmitting the collected signals to the control module;
The execution module further comprises a relay module, the relay module is in control electric connection with the control module, the relay module is in control electric connection with the ammonia control valve unit, the combustion-supporting air control valve unit, the steam control valve unit and the igniter control unit, and the control module controls the execution module to work through the relay module after receiving the collected signals;
The control module adopts a OVATION controller, the input end of the OVATION controller is electrically connected with an ammonia supply main pipe pressure transmitter (13), an integrated flowmeter (14), a combustion air volume flowmeter (15), a combustion air pressure transmitter (16), a combustion air measuring thermocouple (19), a purging air pressure transmitter (17), a purging air measuring thermocouple (20), a temperature measuring element, a fire detecting probe and a pair of ammonia leakage detectors (18), a relay coil and a plurality of relay contacts are arranged in the relay module, the voltage output end of the OVATION controller is connected with the relay coil arranged in the relay module, the contacts of the relay module relay are connected to an ammonia supply main pipe control valve (2), an ammonia supply main pipe stop valve (3), a pair of ammonia supply manual valves (4), a pneumatic ammonia supply regulating valve (5), an electric ammonia supply emergency stop valve (6), an electric valve (10), an electric steam stop valve (11), a check valve (12), an electric stop valve (8), a combustion air regulating valve (9) and an igniter control unit, and the relay of the igniter control unit are connected with the relay coil of the igniter control unit, and the relay unit is connected with the input end of the relay module through the relay control unit of the control unit;
The control module is electrically connected with an ammonia concentration detection module and an alarm module, the ammonia concentration detection module is used for collecting ammonia concentration data recorded by the two ammonia leakage detectors (18), the alarm module comprises an audible and visual alarm and a vibrator, contacts of a relay of the relay module are connected with electric input ends of the audible and visual alarm and the vibrator, and the OVATION controller controls the audible and visual alarm and the vibrator to work by controlling the on-off of a relay coil;
The control module obtains the flow of the combustion-supporting air conveyed by the air supply pipeline (C) and the flow of the ammonia conveyed by the ammonia conveying pipeline system through the measuring module, and the control module keeps the flow of the combustion-supporting air and the flow of the ammonia in an adjustable range through the executing module;
The control module obtains the ammonia flow rate conveyed by the ammonia branch pipeline (A2) through the measurement module to obtain an ammonia flow rate value, the ammonia flow rate value is conveyed to the boiler fuel control system, and the control module enables the ammonia amount, the boiler coal feeding amount and the fuel air amount to realize automatic proportion linkage control through the execution module.
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| CN202310595787.XA CN116792777B (en) | 2023-05-22 | 2023-05-22 | Boiler adulterated ammonia combustion sequence control system |
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| CN202310595787.XA CN116792777B (en) | 2023-05-22 | 2023-05-22 | Boiler adulterated ammonia combustion sequence control system |
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| CN207815320U (en) * | 2018-01-09 | 2018-09-04 | 沈阳创联工业技术有限公司 | A kind of industrial gas furnace combustion system |
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