Liquid ammonia direct injection combustion feeding system for coal-fired boiler and control method

Abstract

The invention discloses a liquid ammonia direct injection combustion feeding system for a coal-fired boiler and a control method. Comprising a coal-fired boiler hearth, a liquid ammonia power source control block, a liquid ammonia main valve control block, a first liquid ammonia direct injection burner control block, a first liquid ammonia direct injection burner, a first flame monitoring device, a second liquid ammonia direct injection burner control block, a second liquid ammonia direct injection burner, a second flame monitoring device and a third liquid ammonia direct injection burner control block. The invention discloses a third liquid ammonia direct injection combustor, and relates to the technical field of liquid ammonia direct injection combustion feeding. According to the liquid ammonia direct injection combustion feeding system for the coal-fired boiler and the control method, valve assemblies and pipelines related to the liquid ammonia direct injection combustor and the system thereof are small in size and small in occupied installation space, the ammonia supply amount is increased by multiple times under the same space position, the liquid ammonia direct injection combustor and the system thereof do not need to be provided with a liquid ammonia evaporator and a heat exchange medium, and the cost is low. According to the system, the complexity and the investment cost of the system are reduced, and the later maintenance and repair cost of the system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of liquid ammonia direct injection combustion feeding, and in particular to a liquid ammonia direct injection combustion feeding system for a coal-fired boiler and a control method. Background Art

[0002] Ammonia is a good carrier of hydrogen. Compared with hydrogen, it has a higher hydrogen content and higher volume energy density. It is easy to liquefy for transportation and storage, and has high safety. It can effectively serve as a carrier of hydrogen and energy, and is considered to be a more promising clean fuel. Using ammonia as a substitute for fossil fuels and replacing part of fossil fuels with equal calorific value to enter the boiler for blending can effectively reduce carbon emissions.

[0003] At present, from the completed large-proportion ammonia combustion test of coal-fired units, it is known that the ammonia blending ratio of 10-35% can be continuously adjusted in 300MW coal-fired units, and the maximum ammonia supply is 20t / h. In the follow-up, there are certain limitations on the existing ammonia blending combustion technology in terms of increasing the ammonia blending ratio and ammonia blending amount;

[0004] On the one hand, the structure of the ammonia burner itself is limited. The main disadvantage of the ammonia burner is that the structure is large and the ammonia supply is small. In order to meet the large-capacity ammonia supply, the volume of the ammonia burner will also be greatly increased, resulting in no location for installation or a small number of installations and failure to achieve the target ammonia supply;

[0005] On the other hand, the ammonia burner feeding system needs to be equipped with a liquid ammonia evaporator. When a large proportion of ammonia is blended, not only multiple liquid ammonia evaporators need to be configured, but also an effective and reliable heat exchange medium needs to be provided. This greatly increases the equipment complexity and investment cost of the ammonia blending combustion system, and also brings manpower and material resources to the subsequent equipment maintenance. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a liquid ammonia direct injection combustion feeding system and control method for a coal-fired boiler, which solves the problems of no location for installation or a small number of installations and inability to achieve the target ammonia supply. When a large proportion of blending is carried out, not only multiple liquid ammonia evaporators need to be configured, but also an effective and reliable heat exchange medium needs to be provided, which greatly increases the equipment complexity and investment cost of the ammonia blending combustion system.

[0007] To achieve the above purpose, the present invention is implemented through the following technical scheme: a liquid ammonia direct injection combustion feeding system for a coal-fired boiler, comprising a coal-fired boiler furnace, a liquid ammonia power source control block, a liquid ammonia main valve control block, a No. 1 liquid ammonia direct injection burner control block, a No. 1 liquid ammonia direct injection burner, a No. 1 flame monitoring device, a No. 2 liquid ammonia direct injection burner control block, a No. 2 liquid ammonia direct injection burner, a No. 2 flame monitoring device, a No. 3 liquid ammonia direct injection burner control block, a No. 3 liquid ammonia direct injection burner, a No. 3 flame monitoring device, a No. 4 liquid ammonia direct injection burner control block, a No. 4 liquid ammonia direct injection burner, and a No. 4 flame monitoring device. No. 4 liquid ammonia direct injection burner, No. 4 flame monitoring device, No. 2 flue gas online monitoring system, No. 1 flue gas online monitoring system, No. 1 temperature measuring device, No. 2 temperature measuring device, combustion-supporting air and purge medium master control block, combustion-supporting air master pipeline inlet and purge medium master pipeline inlet, the liquid ammonia power source control block and the liquid ammonia master valve control block are arranged in the ammonia storage area, the combustion-supporting air master pipeline inlet and the purge medium master pipeline inlet are both arranged in the combustion-supporting air and purge medium master control block, and the outlets of the liquid ammonia master valve control block and the combustion-supporting air and purge medium master control block are respectively connected through three The through pipe is connected with the inlet of the coal-fired boiler furnace, the No. 1 liquid ammonia direct injection burner control block, the No. 2 liquid ammonia direct injection burner control block, the No. 3 liquid ammonia direct injection burner control block, and the No. 4 liquid ammonia direct injection burner control block, and the No. 1 liquid ammonia direct injection burner control block, the No. 2 liquid ammonia direct injection burner control block, the No. 3 liquid ammonia direct injection burner control block, and the No. 4 liquid ammonia direct injection burner control block are respectively connected with the No. 1 liquid ammonia direct injection burner, the No. 2 liquid ammonia direct injection burner, the No. 3 liquid ammonia direct injection burner, and the No. 4 liquid ammonia direct injection burner control block through flange pipelines. The No. 1 flame monitoring device, No. 2 liquid ammonia direct injection burner, No. 3 liquid ammonia direct injection burner and No. 4 liquid ammonia direct injection burner are respectively installed on the four cut corners of the No. 4 liquid ammonia direct injection burner, the No. 1 flame monitoring device, No. 2 flame monitoring device, No. 3 flame monitoring device and No. 4 flame monitoring device are respectively installed on the four cut corners of the coal-fired boiler furnace, the No. 2 flue gas online monitoring system and the No. 1 flue gas online monitoring system are respectively installed on the front wall and the rear wall of the coal-fired boiler furnace, and the No. 1 temperature measuring device and the No. 2 temperature measuring device are respectively installed on the left wall and the right wall of the coal-fired boiler furnace.

[0008] Preferably, the liquid ammonia power source control unit comprises a liquid ammonia storage tank, a liquid ammonia drive pump and a liquid ammonia motor. The liquid ammonia storage tank is connected to the liquid ammonia drive pump through a pipeline, and the liquid ammonia drive pump and the liquid ammonia motor are arranged as an integral unit.

[0009] Preferably, the combustion-supporting air and purge medium master control block includes a primary air master pneumatic valve, a first primary air main pipe manual gate valve, a second primary air main pipe manual gate valve, a primary air duct orifice flowmeter, a first primary air bypass manual gate valve, a purge medium master pneumatic valve, a second primary air bypass manual gate valve, a purge medium master front end gate valve, a master orifice flowmeter and a purge medium master pipe stop valve, the combustion-supporting air master pipeline inlet and the purge medium master pipeline inlet enter the combustion-supporting air and purge medium master control block, the first The second primary air main manual gate valve is installed at the front end of the primary air duct orifice flowmeter, the first primary air bypass manual gate valve is arranged on the primary air duct orifice flowmeter, the first primary air main manual gate valve is installed on the front side of the primary air main pneumatic valve, the purge medium main pneumatic valve is arranged on the primary air main pneumatic valve, the front end gate valve of the purge medium main pipe, the main pipe orifice flowmeter, the purge medium main pipe stop valve and the second primary air bypass manual gate valve are arranged in sequence on the rear side of the purge medium main pipeline inlet.

[0010] Preferably, the No. 1 liquid ammonia direct injection burner control block includes a primary air duct, a purge medium inlet pipe, a liquid ammonia control block, a liquid ammonia pressure gauge, a liquid ammonia temperature sensor, a liquid ammonia pressure sensor, a liquid ammonia inlet ball valve, a liquid ammonia inlet corrosion-resistant hose, a purge medium pressure gauge, a purge medium pressure sensor, a purge medium control block, a primary air temperature-resistant hose, a primary air temperature sensor, a primary air pressure gauge, a primary air pressure sensor and a primary air control block.

[0011] Preferably, the liquid ammonia control block includes a liquid ammonia pipeline flame arrester, a first electric ball valve, a liquid ammonia electric regulating valve, a second electric ball valve, a flowmeter bypass manual ball valve, a liquid ammonia branch manual ball valve, a mass meter rear end manual ball valve, a mass flow meter, a flowmeter front end manual ball valve and a liquid ammonia fuel inlet pipe. The liquid ammonia branch manual ball valve, the flowmeter front end manual ball valve, the mass flow meter, the mass meter rear end manual ball valve, the second electric ball valve, the liquid ammonia electric regulating valve, the first electric ball valve, the liquid ammonia pipeline flame arrester, the liquid ammonia pressure sensor, the liquid ammonia inlet ball valve and the liquid ammonia inlet corrosion-resistant hose are respectively arranged on the liquid ammonia fuel inlet pipe, and the flowmeter bypass manual ball valve is arranged on the mass flow meter.

[0012] Preferably, the primary air control block includes a primary air damper electric regulating valve, a primary air damper regulating valve rear end gate valve, a primary air damper regulating valve bypass gate valve, a primary air damper regulating valve rear end gate valve, a primary air mass flow meter, a primary air damper branch gate valve and a primary air duct; the primary air damper branch gate valve, the primary air mass flow meter, the primary air damper regulating valve rear end gate valve, the primary air damper electric regulating valve and the primary air damper regulating valve rear end gate valve are arranged on the primary air duct; the primary air duct is provided with a primary air pressure sensor, a primary air pressure gauge, a primary air temperature sensor and a primary air temperature resistant hose; the primary air damper electric regulating valve is connected to the primary air damper regulating valve bypass gate valve.

[0013] Preferably, the purge medium control block includes a purge medium front end stop valve, a purge medium front end gate valve, a purge medium electric regulating valve, a purge medium rear end check valve and a purge medium inlet pipe. The purge medium front end stop valve, the purge medium front end gate valve, the purge medium electric regulating valve, the purge medium rear end check valve, the purge medium pressure gauge and the purge medium pressure sensor are arranged on the purge medium inlet pipe, and the purge medium control block is connected to the rear side of the liquid ammonia pipeline flame arrester through a three-way interface.

[0014] Preferably, the No. 4 liquid ammonia direct injection burner includes a main combustion zone, a reburning zone, a burnout zone, a liquid ammonia direct injection burner, an online flue gas analysis system, an online temperature measurement system, a flame monitoring system, and an ammonia leakage alarm system. The liquid ammonia direct injection burner is installed on the furnace wall of the main combustion zone of the coal-fired boiler furnace and is placed at the same angle and parallel to the pulverized coal burner. The flame monitoring system is arranged on the furnace wall near the liquid ammonia direct injection burner, the online flue gas analysis system is arranged at the coal-fired boiler furnace outlet, the online temperature measurement system is arranged on the furnace wall of the reburning zone, and the ammonia leakage alarm system is arranged on the outside of the boiler furnace.

[0015] Preferably, the liquid ammonia direct injection combustion and feeding system comprises a coal-fired boiler DCS system, a liquid ammonia direct injection feeding control system, an online flue gas monitoring module, an ammonia leakage alarm module, an online temperature measurement module, a flame monitoring module and fuel control modules for burners No. 1, No. 2, No. 3 and No. 4; the liquid ammonia direct injection combustion and feeding system is arranged in a control room; the online flue gas monitoring module, the ammonia leakage alarm module, the online temperature measurement module, the flame monitoring module and fuel control modules for burners No. 1, No. 2, No. 3 and No. 4 are connected to the liquid ammonia direct injection feeding control system through a cable; the liquid ammonia direct injection feeding control system and the coal-fired boiler DCS system are provided with a data exchange communication interface for powering the system and realizing linkage control of equipment;

[0016] The system maintains the current position. When the system inputs the ammonia blending instruction, the instruction is transmitted to the coal-fired boiler DCS system to request the task. The coal-fired boiler DCS system receives the instruction and transmits the instruction to the liquid ammonia direct injection feeding control system. After receiving the instruction, the fuel drive source control module, the main valve control module, the valve control modules of the No. 1, No. 2, No. 3 and No. 4 burners, the temperature measurement, flue gas analysis, flame monitoring and alarm system control modules are tested and monitored. The module is tested and monitored. If the starting conditions cannot be met, it stops working. Check the system and eliminate the fault before circulating again. If the system meets the requirements, start the fuel drive source control module, the main valve control module temperature measurement, flue gas analysis, flame monitoring, and alarm system control module, and start the No. 1, No. 2, No. 3, and No. 4 burner valve control modules in sequence. The liquid ammonia direct injection furnace feeding system works. When the system issues a stop command or a manual stop signal, the system receives and stops working instructions. When the system receives, fault signals, ammonia combustion leak detector alarms, abnormal signals, and manual stop signals, the system alarms, the system sends a signal, the system stops working and restarts.

[0017] The present invention also discloses a method for controlling the direct injection combustion and feeding of liquid ammonia in a coal-fired boiler, which specifically comprises the following steps:

[0018] Step 1, open the manual ball valves on the liquid ammonia main line in sequence to make the valves in the open state, open the first electric ball valve 232 and the second electric ball valve 234 of the liquid ammonia control block 23 at the No. 1 angle in sequence, open the main pneumatic valve of liquid ammonia, open the first electric ball valve and the second electric ball valve of the liquid ammonia control block at the No. 3 angle in sequence, open the first electric ball valve and the second electric ball valve of the liquid ammonia control block at the No. 2 angle in sequence, open the first electric ball valve and the second electric ball valve of the liquid ammonia control block at the No. 4 angle in sequence, adjust the liquid ammonia electric regulating valves at the No. 1 angle, the No. 3 angle, the No. 2 angle and the No. 4 angle in sequence, and adjust the openings to 5%, and adjust the primary air door electric regulating valves in the primary air control blocks at the corresponding angles in sequence to distribute air and maintain 60mi;

[0019] Step 2, start the liquid ammonia pump in the liquid ammonia area, adjust the opening of the electric regulating valves of liquid ammonia at angles 1, 3, 2 and 4 in turn, so that the flow rate is maintained at 15% of the total opening, adjust the electric regulating valves of the primary air door in the primary air control block of the corresponding angles in turn to distribute air, observe the pressure and flow rate of angles 1, 3, 2 and 4 in turn, keep the pressure stable, and keep the flow rate of each angle at 15% of the total flow rate for 30 minutes, adjust the electric regulating valves of liquid ammonia at angles 1, 3, 2 and 4 in turn, and adjust their openings from 15% → 25% → 40% → 50% → 60% → 80%, and adjust the electric regulating valves of the primary air door in the primary air control block of the corresponding angles in turn to distribute air, and maintain each level of flow for 30 minutes, observe and record the furnace temperature, NOX, oxygen content, and ammonia escape value;

[0020] Step 3. After the combustion of the liquid ammonia direct injection burner is completed, turn off the liquid ammonia pump in the liquid ammonia area, close the manual valve on the pipeline from the liquid ammonia storage tank to the liquid ammonia pump, and maintain the pipeline pneumatic ball valve in the open state until the flow meter at the outlet of the liquid ammonia pump displays the flow rate. Adjust the No. 1, No. 3, No. 2 and No. 4 liquid ammonia electric regulating valves in turn, and reduce their openings step by step from 80% → 60% → 50% → 40% → 30% → 20%. At the same time, adjust the primary air door electric regulating valve in the primary air control block of the corresponding angle in turn to distribute air. Maintain each level of flow for 10 minutes, and close the manual ball valves opened on the pipeline before work in turn, and restore the valves to their original closed state.

[0021] Beneficial Effects

[0022] The present invention provides a liquid ammonia direct injection combustion feeding system and control method for a coal-fired boiler. Compared with the existing technology, it has the following beneficial effects:

[0023] (1) The valve components and pipelines involved in the liquid ammonia direct injection burner and the system of the present invention are small in size and occupy a small installation space. The ammonia supply is increased several times under the same spatial position. The liquid ammonia direct injection burner and the system do not need to be equipped with a liquid ammonia evaporator and a heat exchange medium. The system not only reduces the complexity and investment cost of the system, but also reduces the subsequent maintenance and repair costs of the system.

[0024] (2) The present invention can flexibly select automatic ammonia blending, semi-automatic ammonia blending and manual ammonia blending according to the actual needs of the boiler unit, so as to facilitate flexible control of the system and improve the flexibility and efficiency of the system. An online flue gas monitoring system and an online temperature measurement system are provided. Through the boiler DCS control system, the liquid ammonia feeding closed-loop feedback controller and the coal powder controller linkage control and PID control algorithm, the liquid ammonia blending amount and the coal powder amount can be automatically adjusted according to the real-time monitoring of the NOx value and the furnace temperature, and the air volume, coal volume and ammonia volume of the ammonia-coal blended fuel can be controlled. The furnace temperature and NOx value can be controlled and adjusted in real time, ensuring efficient combustion and clean exhaust of the ammonia-blended fuel.

[0025] (3) The present invention can realize multi-level automatic adjustment of liquid ammonia fuel and combustion-supporting medium through the automatic adjustment control system of fuel and combustion-supporting medium, with an adjustment range of 5-100%. It has strong adaptability and is equipped with an online ammonia leakage monitoring system, a flame monitoring system and an ammonia pressure sensor. By detecting and monitoring ammonia concentration, monitoring the ammonia fuel combustion flame and the liquid ammonia system pressure, real-time monitoring and alarm are realized, and the safety and reliability of the system are improved. It can meet the needs of large-capacity ammonia supply for coal-fired units and large-proportion blending of clean fuels for large units. At the same time, it can realize the energy transformation of coal-fired units and the replacement of fossil fuels, effectively reduce carbon emissions, and assist in the implementation of the dual carbon policy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the liquid ammonia direct injection combustion feeding system of the present invention;

[0027] Figure 2 This is a feeding principle diagram of the No. 1 liquid ammonia direct injection burner of the present invention;

[0028] Figure 3 It is the equipment arrangement and logic framework diagram of the coal-fired boiler in the height direction of the present invention;

[0029] Figure 4 This is a control workflow diagram of the liquid ammonia direct injection furnace feeding system of the present invention.

[0030] In the figure: 1. Liquid ammonia power source control block; 2. Liquid ammonia storage tank; 3. Liquid ammonia drive pump; 4. Liquid ammonia motor; 5. Liquid ammonia main valve control block; 6. Liquid ammonia manual ball valve; 7. Liquid ammonia main pipe mass flowmeter; 8. Liquid ammonia main pneumatic valve front manual ball valve; 9. Liquid ammonia main pneumatic valve; 10. Liquid ammonia pipeline safety valve; 11. First liquid ammonia bypass manual ball valve; 12. Second liquid ammonia bypass manual ball valve; 13. Primary air main pneumatic valve; 14. First primary air main pipe manual gate valve; 15. Second primary air main pipe manual gate valve; 16. Primary air duct orifice flowmeter; 17. First primary air bypass manual gate valve; 18. Second primary air bypass manual gate valve; 19. Purge medium main pneumatic valve; 20. Purge medium main pipe front manual gate valve End gate valve; 21. Main pipe orifice flowmeter; 22. Purge medium main pipe stop valve; 23. Liquid ammonia control block; 24. Liquid ammonia pressure gauge; 25. Liquid ammonia temperature sensor; 26. Liquid ammonia pressure sensor; 27. Liquid ammonia inlet ball valve; 28. Liquid ammonia inlet corrosion-resistant hose; 29. ​​Purge medium pressure gauge; 30. Purge medium pressure sensor; 31. Purge medium control block; 32. Primary air temperature-resistant hose; 33. Primary air temperature sensor; 34. Primary air pressure gauge; 35. Primary air pressure sensor; 36. Primary air control block; 37. No. 1 liquid ammonia direct injection burner control block; 38. No. 1 liquid ammonia direct injection burner; 39. No. 2 flame monitoring device; 40. No. 2 liquid ammonia direct injection burner control block; 41. No. 2 liquid ammonia direct injection Burner; 42. No. 2 flue gas online monitoring system; 43. No. 3 liquid ammonia direct injection burner control block; 44. No. 1 temperature measuring device; 45. No. 3 flame monitoring device; 46. No. 3 liquid ammonia direct injection burner; 47. No. 1 flue gas online monitoring system; 48. No. 4 liquid ammonia direct injection burner; 49. Coal-fired boiler furnace; 50. No. 4 flame monitoring device; 51. No. 2 temperature measuring device; 52. No. 4 liquid ammonia direct injection burner control block; 53. No. 1 flame monitoring device; 54. Combustion-supporting air and purge medium total control block; 55. Combustion-supporting air total pipeline inlet; 56. Purge medium total pipeline inlet; 231. Liquid ammonia pipeline flame arrester; 232. First electric ball valve; 233. Liquid ammonia electric regulating valve; 234. Second electric ball valve; 23 5. Manual ball valve for flow meter bypass; 236. Manual ball valve for liquid ammonia branch; 237. Manual ball valve at the rear end of mass meter; 238. Mass flow meter; 239. Manual ball valve at the front end of flow meter; 2310. Liquid ammonia fuel inlet pipe; 311. Stop valve at the front end of purge medium; 312. Gate valve at the front end of purge medium; 313. Electric regulating valve for purge medium; 314. Check valve at the rear end of purge medium; 315. Purge medium inlet pipe; 361. Electric regulating valve for primary air damper; 362. Gate valve at the rear end of primary air damper regulating valve; 363. Gate valve for bypass of primary air damper regulating valve; 364. Gate valve at the rear end of primary air damper regulating valve; 365. Primary air mass flow meter; 366. Gate valve for primary air damper branch; 367. Primary air duct. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] See also Figure 1-4 The present invention provides a technical solution: a liquid ammonia direct injection combustion feeding system for a coal-fired boiler, comprising a coal-fired boiler furnace 49, a liquid ammonia power source control block 1, a liquid ammonia main valve control block 5, a No. 1 liquid ammonia direct injection burner control block 37, a No. 1 liquid ammonia direct injection burner 38, a No. 1 flame monitoring device 53, a No. 2 liquid ammonia direct injection burner control block 40, a No. 2 liquid ammonia direct injection burner 41, a No. 2 flame monitoring device 39, a No. 3 liquid ammonia direct injection burner control block 43, a No. 3 liquid ammonia direct injection burner 46, a No. 3 flame monitoring device 45, a No. 4 liquid ammonia direct injection burner control block 52, a No. 4 liquid ammonia direct injection burner 48, a No. 4 flame monitoring device 50, a No. 2 smoke The gas online monitoring system 42, the No. 1 flue gas online monitoring system 47, the No. 1 temperature measuring device 44, the No. 2 temperature measuring device 51, the combustion-supporting air and purge medium master control block 54, the combustion-supporting air master pipeline inlet 55 and the purge medium master pipeline inlet 56, the liquid ammonia power source control block 1 and the liquid ammonia master valve control block 5 are arranged in the ammonia storage area, the combustion-supporting air master pipeline inlet 55 and the purge medium master pipeline inlet 56 are both arranged in the combustion-supporting air and purge medium master control block 54, and the outlets of the liquid ammonia master valve control block 5 and the combustion-supporting air and purge medium master control block 54 are respectively connected to the coal-fired boiler furnace 49, the No. 1 liquid ammonia direct injection burner control block 37, and the No. 2 liquid ammonia direct injection burner control block 4 0, the inlet of the No. 3 liquid ammonia direct injection burner control block 43 and the No. 4 liquid ammonia direct injection burner control block 52 are connected, the No. 1 liquid ammonia direct injection burner control block 37, the No. 2 liquid ammonia direct injection burner control block 40, the No. 3 liquid ammonia direct injection burner control block 43 and the No. 4 liquid ammonia direct injection burner control block 52 are respectively connected with the No. 1 liquid ammonia direct injection burner 38, the No. 2 liquid ammonia direct injection burner 41, the No. 3 liquid ammonia direct injection burner 46 and the No. 4 liquid ammonia direct injection burner 48 through flange pipelines, and the No. 1 liquid ammonia direct injection burner 38, the No. 2 liquid ammonia direct injection burner 41, the No. 3 liquid ammonia direct injection burner 46 and the No. 4 liquid ammonia direct injection burner 48 are respectively installed on the No. 4 liquid ammonia direct injection burner 48 On the four corners, the No. 1 flame monitoring device 53, the No. 2 flame monitoring device 39, the No. 3 flame monitoring device 45 and the No. 4 flame monitoring device 50 are respectively installed on the four corners of the coal-fired boiler furnace 49, the No. 2 flue gas online monitoring system 42 and the No. 1 flue gas online monitoring system 47 are respectively installed on the front wall and the rear wall of the coal-fired boiler furnace 49, the No. 1 temperature measuring device 44 and the No. 2 temperature measuring device 51 are respectively installed on the left wall and the right wall of the coal-fired boiler furnace 49, and the liquid ammonia power source control unit 1 includes a liquid ammonia storage tank 2, a liquid ammonia drive pump 3 and a liquid ammonia motor 4. The liquid ammonia storage tank 2 is connected to the liquid ammonia drive pump 3 through a pipeline, and the liquid ammonia drive pump 3 and the liquid ammonia motor 4 are configured as an integral type.

[0033] Furthermore, the combustion-supporting air and purge medium master control block 54 includes a primary air master pneumatic valve 13, a first primary air master manual gate valve 14, a second primary air master manual gate valve 15, a primary air duct orifice flowmeter 16, a first primary air bypass manual gate valve 17, a purge medium master pneumatic valve 19, a second primary air bypass manual gate valve 18, a purge medium master front end gate valve 20, a master orifice flowmeter 21 and a purge medium master stop valve 22, and the combustion-supporting air master pipeline inlet 55 and the purge medium master pipeline inlet 56 enter the combustion-supporting air and purge medium master control block 54. The second primary air main manual gate valve 15 is installed at the front end of the primary air duct orifice flowmeter 16, the first primary air bypass manual gate valve 17 is arranged on the primary air duct orifice flowmeter 16, the first primary air main manual gate valve 14 is installed on the front side of the primary air main pneumatic valve 13, the purge medium main pneumatic valve 19 is arranged on the primary air main pneumatic valve 13, the purge medium main pipe front end gate valve 20, the main pipe orifice flowmeter 21, the purge medium main pipe stop valve 22 and the second primary air bypass manual gate valve 18 are arranged in sequence on the rear side of the purge medium main pipeline inlet 56.

[0034] Furthermore, the No. 1 liquid ammonia direct injection burner control block 37 includes a primary air duct 367, a purge medium inlet pipe 315, a liquid ammonia control block 23, a liquid ammonia pressure gauge 24, a liquid ammonia temperature sensor 25, a liquid ammonia pressure sensor 26, a liquid ammonia inlet ball valve 27, a liquid ammonia inlet corrosion-resistant hose 28, a purge medium pressure gauge 29, a purge medium pressure sensor 30, a purge medium control block 31, a primary air temperature-resistant hose 32, a primary air temperature sensor 33, a primary air pressure gauge 34, a primary air pressure sensor 35 and a primary air control block 36.

[0035] Furthermore, the liquid ammonia control block 23 includes a liquid ammonia pipeline flame arrester 231, a first electric ball valve 232, a liquid ammonia electric regulating valve 233, a second electric ball valve 234, a flow meter bypass manual ball valve 235, a liquid ammonia branch manual ball valve 236, a mass meter rear end manual ball valve 237, a mass flow meter 238, a flow meter front end manual ball valve 239 and a liquid ammonia fuel inlet pipe 2310. The liquid ammonia branch manual ball valve 236, the flow meter front end manual ball valve 239, the mass flow meter 238, the mass meter rear end manual ball valve 237, the second electric ball valve 234, the liquid ammonia electric regulating valve 233, the first electric ball valve 232, the liquid ammonia pipeline flame arrester 231, the liquid ammonia pressure sensor 26, the liquid ammonia inlet ball valve 27 and the liquid ammonia inlet corrosion-resistant hose 28 are respectively arranged on the liquid ammonia fuel inlet pipe 2310, and the flow meter bypass manual ball valve 235 is arranged on the mass flow meter 238.

[0036] Furthermore, the primary air control block 36 includes a primary air damper electric regulating valve 361, a primary air damper regulating valve rear end gate valve 362, a primary air damper regulating valve bypass gate valve 363, a primary air damper regulating valve rear end gate valve 364, a primary air mass flow meter 365, a primary air damper branch gate valve 366 and a primary air duct 367. The primary air damper branch gate valve 366, the primary air mass flow meter 365, the primary air damper regulating valve rear end gate valve 364, the primary air damper electric regulating valve 361 and the primary air damper regulating valve rear end gate valve 362 are arranged on the primary air duct 367. The primary air duct 367 is provided with a primary air pressure sensor 35, a primary air pressure gauge 34, a primary air temperature sensor 33 and a primary air temperature resistant hose 32. The primary air damper electric regulating valve 361 is connected to the primary air damper regulating valve bypass gate valve 363.

[0037] Furthermore, the purge medium control block 31 includes a purge medium front end stop valve 311, a purge medium front end gate valve 312, a purge medium electric regulating valve 313, a purge medium rear end check valve 314 and a purge medium inlet pipe 315. The purge medium front end stop valve 311, the purge medium front end gate valve 312, the purge medium electric regulating valve 313, the purge medium rear end check valve 314, the purge medium pressure gauge 29 and the purge medium pressure sensor 30 are arranged on the purge medium inlet pipe 315, and the purge medium control block 31 is connected to the rear side of the liquid ammonia pipeline flame arrester 231 through a three-way interface.

[0038] Furthermore, the No. 4 liquid ammonia direct injection burner 48 includes a main combustion zone, a reburning zone, a burnout zone, a liquid ammonia direct injection burner, an online flue gas analysis system, an online temperature measurement system, a flame monitoring system, and an ammonia leakage alarm system. The liquid ammonia direct injection burner is installed on the furnace wall of the main combustion zone of the coal-fired boiler furnace 49, and is placed at the same angle and parallel to the pulverized coal burner. The flame monitoring system is arranged on the furnace wall near the liquid ammonia direct injection burner, the online flue gas analysis system is arranged at the coal-fired boiler furnace outlet, the online temperature measurement system is arranged on the furnace wall of the reburning zone, and the ammonia leakage alarm system is arranged on the outside of the boiler furnace.

[0039] Furthermore, the liquid ammonia direct injection combustion and feeding system includes a coal-fired boiler DCS system, a liquid ammonia direct injection feeding control system, an online flue gas monitoring module, an ammonia leakage alarm module, an online temperature measurement module, a flame monitoring module, and fuel control modules for burners No. 1, No. 2, No. 3, and No. 4. The liquid ammonia direct injection combustion and feeding system is arranged in a control room. The online flue gas monitoring module, the ammonia leakage alarm module, the online temperature measurement module, the flame monitoring module, and the fuel control modules for burners No. 1, No. 2, No. 3, and No. 4 are connected to the liquid ammonia direct injection feeding control system through cables. The liquid ammonia direct injection feeding control system and the coal-fired boiler DCS system are provided with a data exchange communication interface for powering the system and realizing linkage control of equipment.

[0040] The system maintains the current position. When the system inputs the ammonia blending instruction, the instruction is transmitted to the coal-fired boiler DCS system to request the task. The coal-fired boiler DCS system receives the instruction and transmits the instruction to the liquid ammonia direct injection feeding control system. After receiving the instruction, the fuel drive source control module, the main valve control module, the valve control modules of the No. 1, No. 2, No. 3 and No. 4 burners, the temperature measurement, flue gas analysis, flame monitoring and alarm system control modules are tested and monitored. The module is tested and monitored. If the starting conditions cannot be met, it stops working. Check the system and eliminate the fault before circulating again. If the system meets the requirements, start the fuel drive source control module, the main valve control module temperature measurement, flue gas analysis, flame monitoring, and alarm system control module, and start the No. 1, No. 2, No. 3, and No. 4 burner valve control modules in sequence. The liquid ammonia direct injection furnace feeding system works. When the system issues a stop command or a manual stop signal, the system receives and stops working instructions. When the system receives, fault signals, ammonia combustion leak detector alarms, abnormal signals, and manual stop signals, the system alarms, the system sends a signal, the system stops working and restarts.

[0041] The present invention also discloses a method for controlling the direct injection combustion and feeding of liquid ammonia in a coal-fired boiler, which specifically comprises the following steps:

[0042] Step 1, open the manual ball valves on the liquid ammonia main line in sequence to make the valves in the open state, open the first electric ball valve 232 and the second electric ball valve 234 of the liquid ammonia control block at angle 1 in sequence, open the main pneumatic valve of liquid ammonia, open the first electric ball valve 232 and the second electric ball valve 234 of the liquid ammonia control block at angle 3 in sequence, open the first electric ball valve 232 and the second electric ball valve 234 of the liquid ammonia control block at angle 2 in sequence, open the first electric ball valve 232 and the second electric ball valve 234 of the liquid ammonia control block at angle 4 in sequence, adjust the liquid ammonia electric regulating valves at angles 1, 3, 2 and 4 in sequence, and adjust the openings to 5%, and adjust the primary air door electric regulating valve 361 in the primary air control block 36 of the corresponding angle in sequence to distribute air and maintain 60mi;

[0043] Step 2, start the liquid ammonia pump in the liquid ammonia area, adjust the opening of the electric regulating valves of the liquid ammonia at angles 1, 3, 2 and 4 in turn, so that the flow rate is maintained at 15% of the total opening, adjust the electric regulating valves 361 of the primary air door in the primary air control block 36 of the corresponding angle in turn for air distribution, observe the pressure and flow rate of angles 1, 3, 2 and 4 in turn, keep the pressure stable, and keep the flow rate of each angle at 15% of the total flow rate for 30 minutes, adjust the electric regulating valves of the liquid ammonia at angles 1, 3, 2 and 4 in turn, and adjust their openings from 15% → 25% → 40% → 50% → 60% → 80%, and adjust the electric regulating valves 361 of the primary air door in the primary air control block 36 of the corresponding angle in turn for air distribution, and maintain each level of flow for 30 minutes, and observe and record the furnace temperature, NOX, oxygen content, and ammonia escape value;

[0044] Step 3, after the combustion of the liquid ammonia direct injection burner is completed, turn off the liquid ammonia pump in the liquid ammonia area, close the manual valve on the pipeline from the liquid ammonia storage tank 92 to the liquid ammonia pump, maintain the pipeline pneumatic ball valve in an open state, until the flow rate displayed on the liquid ammonia pump outlet flow meter is, adjust the No. 1, No. 3, No. 2 and No. 4 liquid ammonia electric regulating valves in turn, and reduce their openings step by step from 80% → 60% → 50% → 40% → 30% → 20%, and at the same time adjust the primary air door electric regulating valve 361 in the primary air control block 36 of the corresponding angle in turn for air distribution, and maintain each level of flow for 10 minutes, and close the manual ball valves opened on the pipeline before work in turn, and restore the valves to their original closed state.

Claims

1. A liquid ammonia direct injection combustion feeding system for a coal-fired boiler, comprising a coal-fired boiler furnace (49), a liquid ammonia power source control block (1), a liquid ammonia main valve control block (5), a No. 1 liquid ammonia direct injection burner control block (37), a No. 1 liquid ammonia direct injection burner (38), a No. 1 flame monitoring device (53), a No. 2 liquid ammonia direct injection burner control block (40), a No. 2 liquid ammonia direct injection burner (41), a No. 2 flame monitoring device (39), a No. 3 liquid ammonia direct injection burner control block (43), a No. 3 liquid ammonia direct injection burner control block (44), a No. 3 liquid ammonia direct injection burner control block (45), a No. 3 liquid ammonia direct injection burner control block (46), a No. 3 liquid ammonia direct injection burner control block (47), a No. 3 liquid ammonia direct injection burner control block (48), a No. 3 liquid ammonia direct injection burner control block (49), a No. 3 liquid ammonia direct injection burner control block (51), a No. 3 liquid ammonia direct injection burner control block (49), a No. 3 liquid ammonia direct injection burner control block (52), a No. 3 liquid ammonia direct injection burner control block (41), a No. 3 liquid ammonia direct injection burner control block (42), a No. 3 liquid ammonia direct injection burner control block (43), a No. 3 liquid ammonia direct injection burner control block (47), a No. 3 liquid ammonia direct injection burner control block (48), a No. 3 liquid ammonia direct injection burner control block (49), a No. 3 liquid ammonia direct injection burner control block (49), a No. 3 liquid ammonia direct injection burner control block (47), a No. 3 liquid ammonia direct injection burner control block ( The invention comprises a burner (46), a flame monitoring device (45), a liquid ammonia direct injection burner control block (52), a liquid ammonia direct injection burner (48), a flame monitoring device (50), a flue gas online monitoring system (42), a flue gas online monitoring system (47), a temperature measuring device (44), a temperature measuring device (51), a combustion-supporting air and purge medium total control block (54), a combustion-supporting air total pipeline inlet (55) and a purge medium total pipeline inlet (56), characterized in that: The liquid ammonia power source control block (1) and the liquid ammonia main valve control block (5) are arranged in the ammonia storage area, the combustion-supporting air main pipeline inlet (55) and the purge medium main pipeline inlet (56) are both arranged in the combustion-supporting air and purge medium main control block (54), and the outlets of the liquid ammonia main valve control block (5) and the combustion-supporting air and purge medium main control block (54) are respectively connected to the coal-fired boiler furnace (49) and the No. 1 liquid ammonia direct injection burner control block (37) through three-way pipes. ), the inlets of the No. 2 liquid ammonia direct injection burner control block (40), the No. 3 liquid ammonia direct injection burner control block (43), and the No. 4 liquid ammonia direct injection burner control block (52) are connected, and the No. 1 liquid ammonia direct injection burner control block (37), the No. 2 liquid ammonia direct injection burner control block (40), the No. 3 liquid ammonia direct injection burner control block (43), and the No. 4 liquid ammonia direct injection burner control block (52) are respectively connected to the No. 1 liquid ammonia direct injection burner (38), The second liquid ammonia direct injection burner (41), the third liquid ammonia direct injection burner (46) and the fourth liquid ammonia direct injection burner (48) are connected, the first liquid ammonia direct injection burner (38), the second liquid ammonia direct injection burner (41), the third liquid ammonia direct injection burner (46) and the fourth liquid ammonia direct injection burner (48) are respectively installed on the four cut corners of the fourth liquid ammonia direct injection burner (48), and the first flame monitoring device (53) and the second flame monitoring device (54) are respectively installed on the four cut corners of the fourth liquid ammonia direct injection burner (48). (39), the third flame monitoring device (45) and the fourth flame monitoring device (50) are respectively installed on the four corners of the coal-fired boiler furnace (49), the second flue gas online monitoring system (42) and the first flue gas online monitoring system (47) are respectively installed on the front wall and the rear wall of the coal-fired boiler furnace (49), and the first temperature measuring device (44) and the second temperature measuring device (51) are respectively installed on the left wall and the right wall of the coal-fired boiler furnace (49).

2. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 1, characterized in that: The liquid ammonia power source control unit (1) comprises a liquid ammonia storage tank (2), a liquid ammonia drive pump (3) and a liquid ammonia motor (4); the liquid ammonia storage tank (2) is connected to the liquid ammonia drive pump (3) through a pipeline; the liquid ammonia drive pump (3) and the liquid ammonia motor (4) are arranged in an integrated manner.

3. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 1 is characterized in that: The combustion-supporting air and purge medium master control block (54) comprises a primary air master pneumatic valve (13), a first primary air master manual gate valve (14), a second primary air master manual gate valve (15), a primary air duct orifice flow meter (16), a first primary air bypass manual gate valve (17), a purge medium master pneumatic valve (19), a second primary air bypass manual gate valve (18), a purge medium master front end gate valve (20), a master orifice flow meter (21) and a purge medium master stop valve (22). The combustion-supporting air master pipeline inlet (55) and the purge medium master pipeline inlet (56) enter the combustion-supporting air and purge medium master control block (54). The second primary air main manual gate valve (15) is installed at the front end of the primary air duct orifice flowmeter (16), the first primary air bypass manual gate valve (17) is arranged on the primary air duct orifice flowmeter (16), the first primary air main manual gate valve (14) is installed on the front side of the primary air main pneumatic valve (13), the purge medium main pneumatic valve (19) is arranged on the primary air main pneumatic valve (13), the purge medium main front end gate valve (20), the main orifice flowmeter (21), the purge medium main stop valve (22) and the second primary air bypass manual gate valve (18) are arranged in sequence on the rear side of the purge medium main pipeline inlet (56).

4. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 1, characterized in that: The No. 1 liquid ammonia direct injection burner control block (37) comprises a primary air duct (367), a purge medium inlet pipe (315), a liquid ammonia control block (23), a liquid ammonia pressure gauge (24), a liquid ammonia temperature sensor (25), a liquid ammonia pressure sensor (26), a liquid ammonia inlet ball valve (27), a liquid ammonia inlet corrosion-resistant hose (28), a purge medium pressure gauge (29), a purge medium pressure sensor (30), a purge medium control block (31), a primary air temperature-resistant hose (32), a primary air temperature sensor (33), a primary air pressure gauge (34), a primary air pressure sensor (35) and a primary air control block (36).

5. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 4, characterized in that: The liquid ammonia control block (23) comprises a liquid ammonia pipeline flame arrester (231), a first electric ball valve (232), a liquid ammonia electric regulating valve (233), a second electric ball valve (234), a flow meter bypass manual ball valve (235), a liquid ammonia branch manual ball valve (236), a mass meter rear end manual ball valve (237), a mass flow meter (238), a flow meter front end manual ball valve (239) and a liquid ammonia fuel inlet pipe (2310), wherein the liquid ammonia branch manual ball valve (236), the flow meter front end manual ball valve (237) and the liquid ammonia fuel inlet pipe (2310) are The ball valve (239), the mass flow meter (238), the manual ball valve (237) at the rear end of the mass meter, the second electric ball valve (234), the liquid ammonia electric regulating valve (233), the first electric ball valve (232), the liquid ammonia pipeline flame arrester (231), the liquid ammonia pressure sensor (26), the liquid ammonia inlet ball valve (27) and the liquid ammonia inlet corrosion-resistant hose (28) are respectively arranged on the liquid ammonia fuel inlet pipe (2310), and the flow meter bypass manual ball valve (235) is arranged on the mass flow meter (238).

6. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 4, characterized in that: The primary air control block (36) comprises a primary air damper electric regulating valve (361), a primary air damper regulating valve rear end gate valve (362), a primary air damper regulating valve bypass gate valve (363), a primary air damper regulating valve rear end gate valve (364), a primary air mass flow meter (365), a primary air damper branch gate valve (366) and a primary air duct (367), wherein the primary air damper branch gate valve (366), the primary air mass flow meter (365), the primary air damper regulating valve bypass gate valve (363), the primary air damper regulating valve rear end gate valve (364), a primary air mass flow meter (365), a primary air damper regulating valve bypass gate valve (366) and a primary air duct (367). The valve rear end plug valve (364), the primary air damper electric regulating valve (361), and the primary air damper regulating valve rear end plug valve (362) are arranged on the primary air duct (367); the primary air duct (367) is provided with a primary air pressure sensor (35), a primary air pressure gauge (34), a primary air temperature sensor (33), and a primary air temperature resistant hose (32); the primary air damper electric regulating valve (361) is connected to the primary air damper regulating valve bypass plug valve (363).

7. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 4, characterized in that: The purge medium control block (31) comprises a purge medium front end stop valve (311), a purge medium front end gate valve (312), a purge medium electric regulating valve (313), a purge medium rear end check valve (314) and a purge medium inlet pipe (315). The purge medium front end stop valve (311), the purge medium front end gate valve (312), the purge medium electric regulating valve (313), the purge medium rear end check valve (314), a purge medium pressure gauge (29) and a purge medium pressure sensor (30) are arranged on the purge medium inlet pipe (315). The purge medium control block (31) is connected to the rear side of the liquid ammonia pipeline flame arrester (231) through a three-way interface.

8. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 1, characterized in that: The No. 4 liquid ammonia direct injection burner (48) includes a main combustion zone, a reburning zone, a burnout zone, a liquid ammonia direct injection burner, an online flue gas analysis system, an online temperature measurement system, a flame monitoring system, and an ammonia leakage alarm system. The liquid ammonia direct injection burner is installed on the furnace wall of the main combustion zone of the coal-fired boiler furnace (49) and is placed at the same angle and parallel to the pulverized coal burner. The flame monitoring system is arranged on the furnace wall near the liquid ammonia direct injection burner. The online flue gas analysis system is arranged at the coal-fired boiler furnace outlet, the online temperature measurement system is arranged on the furnace wall of the reburning zone, and the ammonia leakage alarm system is arranged on the outside of the boiler furnace.

9. The liquid ammonia direct injection combustion feeding system for coal-fired boilers according to claim 1, characterized in that: The liquid ammonia direct injection combustion and feeding system comprises a coal-fired boiler DCS system, a liquid ammonia direct injection feeding control system, an online flue gas monitoring module, an ammonia leakage alarm module, an online temperature measurement module, a flame monitoring module and a No. 1, No. 2, No. 3, and No. 4 burner fuel control module. The liquid ammonia direct injection combustion and feeding system is arranged in a control room. The online flue gas monitoring module, the ammonia leakage alarm module, the online temperature measurement module, the flame monitoring module and the No. 1, No. 2, No. 3, and No. 4 burner fuel control module are connected to the liquid ammonia direct injection feeding control system through a cable. The liquid ammonia direct injection feeding control system and the coal-fired boiler DCS system are provided with a data exchange communication interface for powering the system and realizing equipment linkage control; The system maintains the current position. When the system inputs the ammonia blending instruction, the instruction is transmitted to the coal-fired boiler DCS system to request the task. The coal-fired boiler DCS system receives the instruction and transmits the instruction to the liquid ammonia direct injection feeding control system. After receiving the instruction, the fuel drive source control module, the main valve control module, the valve control modules of the No. 1, No. 2, No. 3 and No. 4 burners, the temperature measurement, flue gas analysis, flame monitoring and alarm system control modules are tested and monitored. The module is tested and monitored. If the starting conditions cannot be met, it stops working. Check the system and eliminate the fault before circulating again. If the system meets the requirements, start the fuel drive source control module, the main valve control module temperature measurement, flue gas analysis, flame monitoring, and alarm system control module, and start the No. 1, No. 2, No. 3, and No. 4 burner valve control modules in sequence. The liquid ammonia direct injection furnace feeding system works. When the system issues a stop command or a manual stop signal, the system receives and stops working instructions. When the system receives, fault signals, ammonia combustion leak detector alarms, abnormal signals, and manual stop signals, the system alarms, the system sends a signal, the system stops working and restarts.

10. A method for controlling the direct injection combustion of liquid ammonia in a coal-fired boiler, characterized in that: The specific steps include: Step 1, open the manual ball valves on the liquid ammonia main line in sequence to make the valves in an open state, open the first electric ball valve (232) and the second electric ball valve (234) of the liquid ammonia control block at angle 1 in sequence, open the main pneumatic valve of liquid ammonia, open the first electric ball valve (232) and the second electric ball valve (234) of the liquid ammonia control block at angle 3 in sequence, open the first electric ball valve (232) and the second electric ball valve (234) of the liquid ammonia control block at angle 2 in sequence, open the first electric ball valve (232) and the second electric ball valve (234) of the liquid ammonia control block at angle 4 in sequence, adjust the liquid ammonia electric regulating valves at angles 1, 3, 2 and 4 in sequence, and adjust the openings to 5%, and adjust the primary air door electric regulating valves (361) in the primary air control blocks (36) at the corresponding angles in sequence to distribute air and maintain 60mi; Step 2, start the liquid ammonia pump in the liquid ammonia area, adjust the opening of the electric liquid ammonia regulating valves at angles 1, 3, 2 and 4 in sequence, so that the flow rate is maintained at 15% of the total opening, adjust the electric primary air door regulating valve (361) in the primary air control block (36) of the corresponding angle in sequence to distribute air, observe the pressure and flow rate of angles 1, 3, 2 and 4 in sequence, keep the pressure stable, and keep the flow rate of each angle at 15% of the total flow rate for 30 minutes, adjust the electric liquid ammonia regulating valves at angles 1, 3, 2 and 4 in sequence, and adjust the opening rate from 15%→25%→40%→50%→60%→80%, and adjust the electric primary air door regulating valve (361) in the primary air control block (36) of the corresponding angle in sequence to distribute air, and maintain each level of flow rate for 30 minutes, and observe and record the furnace temperature, NOX, oxygen content, and ammonia escape value; Step 3: After the combustion of the liquid ammonia direct injection burner is completed, the liquid ammonia pump in the liquid ammonia area is turned off, and the manual valve on the pipeline from the liquid ammonia storage tank 92 to the liquid ammonia pump is turned off. The pipeline pneumatic ball valve is maintained in an open state until the flow rate displayed on the liquid ammonia pump outlet flow meter is adjusted in sequence. The opening of the liquid ammonia electric regulating valves at angles 1, 3, 2 and 4 is reduced step by step from 80% → 60% → 50% → 40% → 30% → 20%. At the same time, the primary air door electric regulating valve (361) in the primary air control block (36) of the corresponding angle is adjusted in sequence for air distribution. Each level of flow is maintained for 10 minutes. The manual ball valves opened on the pipeline before the work are closed in sequence, and the valves are restored to the original closed state.

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