Ammonia storage area liquid ammonia power system for ammonia-doped combustion of coal-fired boiler

Abstract

The invention discloses an ammonia storage area liquid ammonia power system for ammonia-doped combustion of a coal-fired boiler, which comprises a liquid ammonia storage tank area, a liquid ammonia storage tank control room, a liquid ammonia pump control valve group area, an ammonia storage area safety cofferdam, an ammonia leakage alarm system, an external electric control system, a cooling circulation system, a nitrogen purging system, an automatic spraying system and an ammonia leakage visual monitoring system, the invention relates to the technical field of ammonia-doped combustion of coal-fired boilers. According to the ammonia storage area liquid ammonia power system for ammonia-doped combustion of the coal-fired boiler, the redundancy technology is adopted, the liquid ammonia outlet is formed in the two-thirds position below the liquid ammonia storage tank and located below a liquid level display device of the liquid ammonia storage tank, it is guaranteed that the liquid ammonia outlet pipe has liquid ammonia output with certain potential energy, meanwhile, gas-liquid separation can be achieved, and the liquid ammonia output efficiency is improved. The liquid ammonia pump is guaranteed to suck pure liquid instead of a gas-liquid mixture, the cavitation phenomenon of the liquid ammonia pump is restrained, noise of the liquid ammonia pump and pipeline vibration are reduced, the performance of the liquid ammonia pump is improved, and the service life of the liquid ammonia pump is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ammonia-blended combustion of coal-fired boilers, and in particular to a liquid ammonia power system in an ammonia storage area used for ammonia-blended combustion of coal-fired boilers. 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 act as a carrier of hydrogen and energy. It is considered to be a more promising clean fuel. Using ammonia as a substitute for fossil fuels and replacing part of the fossil fuels with the same calorific value to enter the boiler for blending can effectively reduce carbon emissions.

[0003] At present, thermal power companies mainly use ammonia for desulfurization and denitrification processes. Since gaseous ammonia is usually used, its usage is small and the transportation distance is short. At room temperature, the pressure of liquid ammonia itself can basically meet the process needs of desulfurization and denitrification. However, if ammonia is blended as fuel, the amount of ammonia blended is large and the transportation distance is long. At the same time, the pressure and characteristics of liquid ammonia vary greatly with the ambient temperature. It is easy to vaporize at room temperature, and its liquid ammonia pressure is low when the temperature is low. Regardless of whether it is in gaseous or liquid state during blending, it is impossible to provide stable and reliable liquid ammonia fuel, resulting in extremely unstable ammonia supply during blending, which cannot meet the ammonia blending demand of boiler units, and seriously affects the normal operation of coal-fired units with ammonia-blended fuel. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a liquid ammonia power system in an ammonia storage area for ammonia-blended combustion in a coal-fired boiler, which solves the problem that whether the ammonia is in gaseous or liquid form, it is impossible to provide stable and reliable liquid ammonia fuel, resulting in an extremely unstable ammonia supply during ammonia blending and failure to meet the ammonia blending demand of the boiler unit.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a liquid ammonia power system in an ammonia storage area for ammonia-blended combustion in a coal-fired boiler, comprising a liquid ammonia storage tank area, a liquid ammonia storage tank control room, a liquid ammonia pump control valve group area, an ammonia storage area safety cofferdam, an ammonia leakage alarm system, an external electric control system, a cooling circulation system, a nitrogen purge system, an automatic spray system and an ammonia leakage visualization monitoring system, wherein the liquid ammonia storage tank area comprises a first liquid ammonia storage tank and a second liquid ammonia storage tank, and the first liquid ammonia storage tank and the fourth pipeline of the first liquid ammonia storage tank are arranged inside the safety cofferdam of the ammonia storage area, and the liquid ammonia storage tank control room is arranged at the rear of the liquid ammonia storage tank area. The external electric control system is arranged inside the liquid ammonia storage tank control room, the liquid ammonia pump control valve group area is arranged outside the safety cofferdam of the ammonia storage area, the ammonia leakage alarm system is arranged between the liquid ammonia storage tank area and the liquid ammonia pump control valve group area through a support frame, the cooling circulation system is arranged inside the liquid ammonia pump control valve group area, the nitrogen purge system is arranged inside the liquid ammonia pump control valve group area, the automatic spray system is arranged above the liquid ammonia storage tank area, the liquid ammonia pump control valve group area and the safety cofferdam of the ammonia storage area through a mounting frame, and the ammonia leakage visualization monitoring system is arranged above the liquid ammonia pump control valve group area through a fixed frame.

[0006] Preferably, a first liquid level display device is provided on one side of the first liquid ammonia storage tank, a flange is connected to one side of the first liquid ammonia storage tank, a first flexible joint is connected to one side of the flange, one end of the first flexible joint is connected to a second liquid ammonia pipe, a first outlet pneumatic valve is provided on the surface of the second liquid ammonia pipe, a first manual ball valve is provided on one side of the surface of the second liquid ammonia pipe, one end of the second liquid ammonia pipe is connected to a pre-buffer tank pressure stabilizing device, and a thermometer and a first pressure sensor are respectively provided on one side of the surface of the pre-buffer tank pressure stabilizing device.

[0007] Preferably, the surface of the pre-buffer tank pressure stabilizing device is connected to a first liquid ammonia pipe at the inlet of the liquid ammonia pump, one end of the first liquid ammonia pipe at the inlet of the liquid ammonia pump is connected to a second manual ball valve, one end of the second manual ball valve is connected to a second liquid ammonia pipe at the inlet of the liquid ammonia pump, one end of the second liquid ammonia pipe at the inlet of the liquid ammonia pump is connected to a second pneumatic valve, one end of the second pneumatic valve is connected to a third liquid ammonia pipe at the inlet of the liquid ammonia pump, a fixed plate is fixedly connected to the bottom of the inner cavity of the liquid ammonia pump control valve group area, a liquid ammonia working pump is installed on the fixed plate by bolts, one side of the liquid ammonia working pump is connected to a liquid ammonia pump cold water pipe, the outlet of the liquid ammonia working pump is connected to the first liquid ammonia pipe at the outlet of the liquid ammonia pump, one end of the first liquid ammonia pipe at the outlet of the liquid ammonia pump is connected to a liquid ammonia pump outlet water stop valve, one end of the liquid ammonia pump outlet water stop valve is connected to a liquid ammonia pump outlet manual ball valve, and one end of the liquid ammonia pump outlet manual ball valve is connected to the second liquid ammonia pipe at the outlet of the liquid ammonia pump.

[0008] Preferably, one end of the second liquid ammonia pipe at the outlet of the liquid ammonia pump is connected to the main liquid ammonia outlet pipe, a main pipe flow meter is provided on the surface of the main pipe flow meter, a front side ball valve is provided on the surface of the main pipe, a main pipe manual ball valve is provided on one side of the surface of the main liquid ammonia outlet pipe, one end of the front side ball valve is connected to the main pipe pneumatic ball valve, one end of the main pipe pneumatic ball valve is connected to the rear side ball valve, the surface of the front buffer tank pressure stabilizing device is connected to the first liquid ammonia pipe at the inlet of the standby pump, one end of the first liquid ammonia pipe at the inlet of the standby pump is connected to the manual ball valve at the inlet of the standby pump, and one end of the manual ball valve at the inlet of the standby pump is connected There is a pneumatic valve for the standby pump inlet, a connecting plate is installed at the rear of the liquid ammonia working pump, and a liquid ammonia standby pump is installed on the connecting plate. The opening of the liquid ammonia standby pump is connected to the second liquid ammonia pipe at the standby pump outlet, and one end of the connecting plate is connected to the standby pump outlet check valve. The rear of the surface of the front buffer tank pressure stabilizing device is connected to a normal-pressure liquid ammonia outlet manual ball valve, one end of the normal-pressure liquid ammonia outlet manual ball valve is connected to a normal-pressure liquid ammonia outlet pneumatic ball valve, the other end of the normal-pressure liquid ammonia outlet manual ball valve is connected to the front buffer tank pressure stabilizing device, and the normal-pressure liquid ammonia outlet pneumatic ball valve is connected to the second liquid ammonia pipe at the standby pump outlet.

[0009] Preferably, the opening of the second liquid ammonia storage tank is connected to a second liquid ammonia storage tank outlet liquid ammonia pipe, the surface of the second liquid ammonia storage tank outlet liquid ammonia pipe is connected to a second liquid ammonia storage tank manual ball valve, one end of the second liquid ammonia storage tank outlet liquid ammonia pipe is connected to a second liquid ammonia storage tank outlet pneumatic valve, and one end of the second liquid ammonia storage tank outlet pneumatic valve is connected to a front buffer tank pressure stabilizing device.

[0010] Preferably, the surface of the second liquid ammonia storage tank is connected with a second liquid ammonia storage tank flexible joint, one end of the second liquid ammonia storage tank flexible joint is connected with the fourth liquid ammonia pipe of the second liquid ammonia storage tank, one end of the fourth liquid ammonia pipe of the second liquid ammonia storage tank is connected with the third manual ball valve of the second liquid ammonia storage tank, the surface of the third manual ball valve of the second liquid ammonia storage tank is connected with the first reflux pipe of the second liquid ammonia storage tank, one end of the pressure stabilizing device of the pre-buffer tank is connected with the purge inlet of the pressure stabilizing device, the surface of the second liquid ammonia storage tank flexible joint is connected with the first reflux pipe of the first liquid ammonia storage tank, one end of the second liquid ammonia storage tank flexible joint is connected with the total reflux pipe regulating valve, one end of the total reflux pipe regulating valve is connected with the first manual ball valve of the total reflux pipe, and one end of the first manual ball valve of the total reflux pipe is connected with a mass flowmeter.

[0011] Preferably, a liquid ammonia main pipe purge inlet is provided on the surface of the liquid ammonia pipe at the outlet of the second liquid ammonia storage tank, a pump outlet safety valve is connected to the surface of the second liquid ammonia pipe at the outlet of the standby pump, a cooling water inlet pipe and a liquid ammonia pump cooling water reflux pipe are respectively connected to one side of the cooling circulation system, one end of the liquid ammonia pump cooling water reflux pipe is connected to a reflux pipe flowmeter, the surface of the liquid ammonia pump cooling water reflux pipe is connected to a standby pump cooling water stop valve, a standby pump cooling water outlet is provided on the standby pump cooling water stop valve, and the opening of the liquid ammonia pump cold water pipe is connected to the working pump cooling water stop valve.

[0012] Preferably, a second pressure sensor and a pressure gauge are provided on the surface of the liquid ammonia pipe at the outlet of the second liquid ammonia storage tank, a cooling water circulation pump assembly is installed inside the cooling circulation system, the cooling water circulation pump assembly is connected with a circulation pump suction pipe, the water outlet end of the cooling water circulation pump assembly is connected with a circulation pump outlet stop valve, one end of the circulation pump outlet stop valve is connected with a circulation pump outlet automatic valve, and one end of the circulation pump outlet automatic valve is connected with a circulation pump outlet water pipe.

[0013] Preferably, the nitrogen purge system is provided with a first nitrogen bottle, a second nitrogen bottle and a third nitrogen bottle, one side of the first nitrogen bottle is connected to a nitrogen outlet stop valve, the other side of the first nitrogen bottle is connected to a nitrogen outlet check valve, and one side of the nitrogen outlet stop valve is connected to a nitrogen pressure regulating valve.

[0014] Preferably, the first liquid ammonia storage tank is connected to a first liquid ammonia reflux pipe flexible joint, one end of the first liquid ammonia reflux pipe flexible joint is connected to the first liquid ammonia storage tank fourth pipeline, one end of the first liquid ammonia storage tank fourth pipeline is connected to the first liquid ammonia storage tank reflux third manual ball valve, one end of the first liquid ammonia storage tank reflux third manual ball valve is connected to the first liquid ammonia storage tank water flow valve, one end of the first liquid ammonia storage tank water flow valve is connected to the second manual ball valve for liquid ammonia reflux, and a pressure stabilizing device safety valve is arranged on the surface of the first liquid ammonia storage tank fourth pipeline, and one end of the pressure stabilizing device safety valve is connected to the pre-buffer tank pressure stabilizing device.

[0015] The present invention provides a liquid ammonia power system in an ammonia storage area for ammonia-blended combustion in a coal-fired boiler. Compared with the existing technology, it has the following beneficial effects: (1) The present invention adopts redundant technology and sets the liquid ammonia outlet at two-thirds of the bottom of the liquid ammonia storage tank, below the liquid level display device of the liquid ammonia storage tank, to ensure that the liquid ammonia outlet pipe has a certain potential energy of liquid ammonia output. At the same time, a buffer tank pressure stabilizing device is set at the inlet of the liquid ammonia pump, which plays a role in energy storage and pressure stabilization, and can achieve gas-liquid separation at the same time, ensuring that the liquid ammonia pump inhales pure liquid rather than a gas-liquid mixture, inhibiting the cavitation phenomenon of the liquid ammonia pump, reducing the noise of the liquid ammonia pump and pipeline vibration, and improving the performance and service life of the liquid ammonia pump. It can realize large-capacity liquid ammonia storage, long-distance liquid ammonia transportation, precise control, energy saving and environmental protection, and online safety monitoring of the whole process to ensure the safety of personnel and systems.

[0016] (2) The present invention adopts the technical principles of elasticity, symmetry and minimum distance through the control valve group and pipeline connection, and makes a reasonable layout according to the system principle and the functions of each component. The pipeline system transition is combined with flexible connection, symmetrical layout, independent shock absorption design, elasticity and rigid design structure to ensure that the system layout is simple, neat and compact, with reasonable maintenance space, reducing system pipeline vibration and noise, while ensuring the reliability and safety of the system.

[0017] (3) The present invention uses ammonia leak alarm and ammonia leak visualization monitoring technology to detect the ammonia concentration in the system and near the ammonia pipeline along the way in real time online, monitor the system and the ammonia pipeline at the same time, collect relevant data, and interconnect with the input and output modules and the system controller to achieve data transmission and logical control. When abnormal data is detected, the automatic emergency response program is started according to the on-site situation, the system valve is automatically closed, and the automatic spray system is triggered to start, which helps to prevent safety risks caused by ammonia leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the structure of the present invention; Figure 2 It is a top view of the structure of the present invention.

[0019] In the figure: 1. first liquid ammonia storage tank; 2. first liquid level display device; 3. flange; 4. first flexible joint; 5. second liquid ammonia pipe; 6. first outlet pneumatic valve; 7. first manual ball valve; 8. front buffer tank pressure stabilizing device; 9. thermometer; 10. first pressure sensor; 11. first liquid ammonia pipe at the inlet of liquid ammonia pump; 12. second manual ball valve; 13. second liquid ammonia pipe at the inlet of liquid ammonia pump; 14. second pneumatic valve; 15. third liquid ammonia pipe at the inlet of liquid ammonia pump; 16. liquid ammonia working pump; 17. fixing plate; 18. bolt; 19. cold water pipe of liquid ammonia pump; 20. first liquid ammonia pipe at the outlet of liquid ammonia pump; 21. water stop valve at the outlet of liquid ammonia pump; 22. manual ball valve at the outlet of liquid ammonia pump; 23. second liquid ammonia pipe at the outlet of liquid ammonia pump; 24. main pipe Flow meter; 25, front ball valve; 26, main pipe manual ball valve; 27, main pipe pneumatic ball valve; 28, rear ball valve; 29, main pipe for total liquid ammonia outlet; 30, first liquid ammonia pipe for standby pump inlet; 31, manual ball valve for standby pump inlet; 32, pneumatic valve for standby pump inlet; 33, liquid ammonia standby pump; 34, connecting plate; 35, second liquid ammonia pipe for standby pump outlet; 36, check valve for standby pump outlet; 37, pneumatic ball valve for normal pressure liquid ammonia outlet; 38, manual ball valve for normal pressure liquid ammonia outlet; 39, manual ball valve for second liquid ammonia storage tank; 40, pneumatic valve for second liquid ammonia storage tank outlet; 41, liquid ammonia pipe for second liquid ammonia storage tank outlet; 42, flexible joint for second liquid ammonia storage tank; 43, fourth liquid ammonia pipe for second liquid ammonia storage tank; 44, third hand check valve for second liquid ammonia storage tank 1. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 2. The first return pipe of the first liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 3. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 4. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 5. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 6. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 7. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 8. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 9. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 10. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 11. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 12. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 13. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 14. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 15. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 16. The first return pipe of the second liquid ammonia storage tank is the first return pipe of the second liquid ammonia storage tank; 17. The first return pipe pipe; 66, first nitrogen bottle; 67, nitrogen outlet stop valve; 68, nitrogen outlet check valve; 69, nitrogen pressure regulating valve; 70, second nitrogen bottle; 71, third nitrogen bottle; 72, second liquid ammonia storage tank; 73, first liquid ammonia reflux pipe flexible joint; 74, first liquid ammonia storage tank fourth pipeline; 75, first liquid ammonia storage tank reflux third manual ball valve; 76, first liquid ammonia storage tank water flow valve; 77, liquid ammonia reflux second manual ball valve; 78, pressure stabilizing device safety valve; 101, liquid ammonia storage tank area; 102, liquid ammonia storage tank control room; 103, liquid ammonia pump control valve group area; 104, ammonia storage area safety cofferdam; 105, ammonia leakage alarm system; 106, external electronic control system; 107, cooling circulation system; 108, nitrogen purge system;109. Automatic sprinkler system; 110. Ammonia leakage visual monitoring system. ; DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-2 The present invention provides a technical solution: a liquid ammonia power system in an ammonia storage area for ammonia-blended combustion in a coal-fired boiler, comprising a liquid ammonia storage tank area 101, a liquid ammonia storage tank control room 102, a liquid ammonia pump control valve group area 103, an ammonia storage area safety cofferdam 104, an ammonia leakage alarm system 105, an external electric control system 106, a cooling circulation system 107, a nitrogen purge system 108, an automatic spray system 109 and an ammonia leakage visualization monitoring system 110, the liquid ammonia storage tank area 101 comprises a first liquid ammonia storage tank 1 and a second liquid ammonia storage tank 72, and the first liquid ammonia storage tank 1 and the first liquid ammonia storage tank fourth pipeline 74 are arranged inside the ammonia storage area safety cofferdam 104, and the liquid ammonia storage tank control room 102 is arranged behind the liquid ammonia storage tank area 101, The external electric control system 106 is arranged inside the liquid ammonia storage tank control room 102, the liquid ammonia pump control valve group area 103 is arranged outside the ammonia storage area safety cofferdam 104, the ammonia leakage alarm system 105 is arranged between the liquid ammonia storage tank area 101 and the liquid ammonia pump control valve group area 103 through a support frame, the cooling circulation system 107 is arranged inside the liquid ammonia pump control valve group area 103, the nitrogen purge system 108 is arranged inside the liquid ammonia pump control valve group area 103, the automatic spray system 109 is arranged above the liquid ammonia storage tank area 101, the liquid ammonia pump control valve group area 103 and the ammonia storage area safety cofferdam 104 through a mounting frame, and the ammonia leakage visualization monitoring system 110 is arranged above the liquid ammonia pump control valve group area 103 through a fixed frame.

[0022] Furthermore, a first liquid level display device 2 is provided on one side of the first liquid ammonia storage tank 1, a flange 3 is connected to one side of the first liquid ammonia storage tank 1, a first flexible joint 4 is connected to one end of the first flexible joint 4, a second liquid ammonia pipe 5 is connected to a first outlet pneumatic valve 6 on the surface of the second liquid ammonia pipe 5, a first manual ball valve 7 is provided on one side of the surface of the second liquid ammonia pipe 5, one end of the second liquid ammonia pipe 5 is connected to a pre-buffer tank pressure stabilizing device 8, a thermometer 9 and a first pressure sensor 10 are respectively provided on one side of the surface of the pre-buffer tank pressure stabilizing device 8, a first liquid ammonia pipe 11 for the inlet of the liquid ammonia pump is connected to one end of the first liquid ammonia pipe 11 for the inlet of the liquid ammonia pump, a second manual ball valve 12 is connected to one end of the second manual ball valve 1 2 is connected with a second liquid ammonia pipe 13 for liquid ammonia pump inlet, one end of the second liquid ammonia pipe 13 for liquid ammonia pump inlet is connected with a second pneumatic valve 14, one end of the second pneumatic valve 14 is connected with a third liquid ammonia pipe 15 for liquid ammonia pump inlet, a fixing plate 17 is fixedly connected to the bottom of the inner cavity of the liquid ammonia pump control valve group area 103, a liquid ammonia working pump 16 is installed on the fixing plate 17 by bolts 18, one side of the liquid ammonia working pump 16 is connected with a liquid ammonia pump cold water pipe 19, the outlet of the liquid ammonia working pump 16 is connected with a first liquid ammonia pipe 20 for liquid ammonia pump outlet, one end of the first liquid ammonia pipe 20 for liquid ammonia pump outlet is connected with a liquid ammonia pump outlet water stop valve 21, one end of the liquid ammonia pump outlet water stop valve 21 is connected with a liquid ammonia pump outlet manual ball valve 22, and one end of the liquid ammonia pump outlet manual ball valve 22 is connected with a liquid ammonia pump outlet The second liquid ammonia pipe 23 at the outlet of the liquid ammonia pump is connected to a main liquid ammonia outlet pipe 29 at one end, a main pipe flow meter 24 is arranged on the surface of the main pipe flow meter 24, a front side ball valve 25 is arranged on the surface of the main pipe flow meter 24, a main pipe manual ball valve 26 is arranged on one side of the surface of the main liquid ammonia outlet pipe 29, one end of the front side ball valve 25 is connected to a main pipe pneumatic ball valve 27, one end of the main pipe pneumatic ball valve 27 is connected to a rear side ball valve 28, the surface of the front buffer tank pressure stabilizing device 8 is connected to a first liquid ammonia pipe 30 for the inlet of the standby pump, one end of the first liquid ammonia pipe 30 for the inlet of the standby pump is connected to a manual ball valve 31 for the inlet of the standby pump, one end of the manual ball valve 31 for the inlet of the standby pump is connected to a pneumatic valve 32 for the inlet of the standby pump, and a connecting A connecting plate 34 is provided on which a liquid ammonia standby pump 33 is installed. The opening of the liquid ammonia standby pump 33 is connected to a second liquid ammonia pipe 35 at the standby pump outlet. One end of the connecting plate 34 is connected to a check valve 36 at the standby pump outlet. A manual ball valve 38 for normal-pressure liquid ammonia outlet is connected to the rear of the surface of the front buffer tank pressure stabilizing device 8. One end of the manual ball valve 38 for normal-pressure liquid ammonia outlet is connected to a pneumatic ball valve 37 for normal-pressure liquid ammonia outlet. The other end of the manual ball valve 38 for normal-pressure liquid ammonia outlet is connected to the front buffer tank pressure stabilizing device 8. The pneumatic ball valve 37 for normal-pressure liquid ammonia outlet is connected to the second liquid ammonia pipe 35 at the standby pump outlet. The opening of the second liquid ammonia storage tank 72 is connected to a second liquid ammonia storage tank outlet liquid ammonia pipe 41. The surface of the second liquid ammonia storage tank outlet liquid ammonia pipe 41 is connected to a second liquid ammonia storage tank manual ball valve 39.One end of the second liquid ammonia storage tank outlet liquid ammonia pipe 41 is connected to the second liquid ammonia storage tank outlet pneumatic valve 40, and one end of the second liquid ammonia storage tank outlet pneumatic valve 40 is connected to the front buffer tank pressure stabilizing device 8.

[0023] Furthermore, the surface of the second liquid ammonia storage tank 72 is connected with a second liquid ammonia storage tank flexible joint 42, one end of the second liquid ammonia storage tank flexible joint 42 is connected with a second liquid ammonia storage tank fourth liquid ammonia pipe 43, one end of the second liquid ammonia storage tank fourth liquid ammonia pipe 43 is connected with a second liquid ammonia storage tank third manual ball valve 44, the surface of the second liquid ammonia storage tank third manual ball valve 44 is connected with a second liquid ammonia storage tank first reflux pipe 45, one end of the front buffer tank pressure stabilizing device 8 is connected with a pressure stabilizing device purge inlet 46, the surface of the second liquid ammonia storage tank flexible joint 42 is connected with the first liquid ammonia storage tank first reflux pipe 47, one end of the second liquid ammonia storage tank flexible joint 42 is connected with a total reflux pipe regulating valve 48, and one end of the total reflux pipe regulating valve 48 is connected with the total reflux pipe regulating valve 48. The first manual ball valve 49 of the main reflux pipe is connected, and one end of the first manual ball valve 49 of the main reflux pipe is connected with a mass flowmeter 50. The surface of the liquid ammonia pipe 41 at the outlet of the second liquid ammonia storage tank is provided with a liquid ammonia main pipe purge inlet 51. The surface of the second liquid ammonia pipe 35 at the outlet of the standby pump is connected with a pump outlet safety valve 52. One side of the cooling circulation system 107 is respectively connected with a cooling water inlet pipe 53 and a liquid ammonia pump cooling water reflux pipe 54. One end of the liquid ammonia pump cooling water reflux pipe 54 is connected with a reflux pipe flowmeter 55. The surface of the liquid ammonia pump cooling water reflux pipe 54 is connected with a standby pump cooling water stop valve 56. A standby pump cooling water outlet 57 is provided on the standby pump cooling water stop valve 56. The opening of the liquid ammonia pump cold water pipe 19 is connected with a working pump cooling water stop valve 58.

[0024] Further, a second pressure sensor 59 and a pressure gauge 60 are provided on the surface of the liquid ammonia pipe 41 at the outlet of the second liquid ammonia storage tank, a cooling water circulation pump assembly 61 is installed inside the cooling circulation system 107, a circulating pump water suction pipe 62 is connected to the cooling water circulation pump assembly 61, a circulating pump outlet stop valve 63 is connected to the water outlet end of the cooling water circulation pump assembly 61, one end of the circulating pump outlet stop valve 63 is connected to the circulating pump outlet automatic valve 64, one end of the circulating pump outlet automatic valve 64 is connected to the circulating pump outlet water pipe 65, a first nitrogen bottle 66, a second nitrogen bottle 70 and a third nitrogen bottle 71 are provided inside the nitrogen purge system 108, one side of the first nitrogen bottle 66 is connected to the nitrogen outlet stop valve 67, and the other side of the first nitrogen bottle 66 is connected to the nitrogen outlet stop valve 68. A nitrogen outlet check valve 68 is connected, and one side of the nitrogen outlet stop valve 67 is connected to a nitrogen pressure regulating valve 69. The first liquid ammonia storage tank 1 is connected to a first liquid ammonia reflux pipe flexible joint 73, and one end of the first liquid ammonia reflux pipe flexible joint 73 is connected to the first liquid ammonia storage tank fourth pipeline 74, and one end of the first liquid ammonia storage tank fourth pipeline 74 is connected to the first liquid ammonia storage tank reflux third manual ball valve 75, and one end of the first liquid ammonia storage tank reflux third manual ball valve 75 is connected to the first liquid ammonia storage tank water flow valve 76, and one end of the first liquid ammonia storage tank water flow valve 76 is connected to the liquid ammonia reflux second manual ball valve 77. A pressure stabilizing device safety valve 78 is arranged on the surface of the first liquid ammonia storage tank fourth pipeline 74, and one end of the pressure stabilizing device safety valve 78 is connected to the front buffer tank pressure stabilizing device 8.

[0025] When in use, the ammonia leakage alarm system 105, the ammonia leakage visual monitoring system 110, and the automatic sprinkler system 109 are in a working emergency state. If the ammonia leakage alarm system 105 and the ammonia leakage visual monitoring system 110 detect abnormal data, the automatic emergency response program will be started according to the on-site situation, the system valve will be automatically closed, and the automatic sprinkler system 109 will be triggered to check for defects and eliminate risks in the system. The system can only be started and operated again after all faults are eliminated. The liquid ammonia storage tank area 101 of this system includes a first liquid ammonia storage tank 1, a second liquid ammonia storage tank 72, a liquid ammonia storage tank control room 102, an ammonia storage area safety cofferdam 104, and an automatic sprinkler system 109. The liquid ammonia storage tank is arranged in the cofferdam. According to the need for ammonia blending, multiple liquid ammonia storage tanks can be arranged. The liquid ammonia storage tank and the foundation are provided with a shock absorbing device to achieve flexible connection. The liquid ammonia storage tank control room 102 is provided with an external electronic control system 106 for controlling the linkage control between valves, components, liquid ammonia pumps, regulating valves, etc. in the ammonia storage area.

[0026] By controlling the liquid ammonia working pump 16 to extract liquid ammonia from the third liquid ammonia pipe 15 at the liquid ammonia pump inlet, the third liquid ammonia pipe 15 at the liquid ammonia pump inlet will extract liquid nitrogen from the pre-buffer tank pressure stabilizing device 8, so that the pre-buffer tank pressure stabilizing device 8 extracts liquid nitrogen from the first liquid ammonia storage tank 1 and the first liquid level display device 2 through the second liquid ammonia pipe 5 and the second liquid ammonia storage tank outlet liquid ammonia pipe 41 respectively, and the liquid nitrogen is passed into the total liquid ammonia outlet main pipe 29 for discharge for use.

[0027] The liquid ammonia pump control valve group area 103 includes a liquid ammonia pump drive device, a nitrogen purge system 108, a cooling circulation system 107, a liquid ammonia buffer component, etc. The components in this area are reasonably arranged according to their functions. The piping system is organically combined with flexible connections, symmetrical layouts, elastic devices and rigid fixations to ensure a reasonable system layout and reasonable repair and maintenance space, while ensuring system reliability and safety, maintainability, predictability of safety risks and safety controllability.

Claims

1. A liquid ammonia power system in an ammonia storage area for ammonia-blended combustion in a coal-fired boiler, comprising a liquid ammonia storage tank area (101), a liquid ammonia storage tank control room (102), a liquid ammonia pump control valve group area (103), an ammonia storage area safety cofferdam (104), an ammonia leakage alarm system (105), an external electric control system (106), a cooling circulation system (107), a nitrogen purge system (108), an automatic spray system (109) and an ammonia leakage visual monitoring system (110), characterized in that: The liquid ammonia storage tank area (101) comprises a first liquid ammonia storage tank (1) and a second liquid ammonia storage tank (72), and the first liquid ammonia storage tank (1) and the first liquid ammonia storage tank fourth pipeline (74) are arranged inside the safety cofferdam (104) of the ammonia storage area, the liquid ammonia storage tank control room (102) is arranged behind the liquid ammonia storage tank area (101), the external electric control system (106) is arranged inside the liquid ammonia storage tank control room (102), the liquid ammonia pump control valve group area (103) is arranged outside the safety cofferdam (104) of the ammonia storage area, and the ammonia leakage alarm system (105) is arranged through a support frame Between the liquid ammonia storage tank area (101) and the liquid ammonia pump control valve group area (103), the cooling circulation system (107) is arranged inside the liquid ammonia pump control valve group area (103), the nitrogen purge system (108) is arranged inside the liquid ammonia pump control valve group area (103), the automatic spray system (109) is arranged above the liquid ammonia storage tank area (101), the liquid ammonia pump control valve group area (103) and the ammonia storage area safety cofferdam (104) through a mounting frame, and the ammonia leakage visualization monitoring system (110) is arranged above the liquid ammonia pump control valve group area (103) through a fixing frame.

2. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 1, characterized in that: A first liquid level display device (2) is provided on one side of the first liquid ammonia storage tank (1); a flange (3) is connected to one side of the first liquid ammonia storage tank (1); a first flexible joint (4) is connected to one side of the flange (3); one end of the first flexible joint (4) is connected to a second liquid ammonia pipe (5); a first outlet pneumatic valve (6) is provided on the surface of the second liquid ammonia pipe (5); a first manual ball valve (7) is provided on one side of the surface of the second liquid ammonia pipe (5); one end of the second liquid ammonia pipe (5) is connected to a front buffer tank pressure stabilizing device (8); a thermometer (9) and a first pressure sensor (10) are provided on one side of the surface of the front buffer tank pressure stabilizing device (8).

3. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 2, characterized in that: The surface of the front buffer tank pressure stabilizing device (8) is connected to a first liquid ammonia pipe (11) for the inlet of the liquid ammonia pump; one end of the first liquid ammonia pipe (11) for the inlet of the liquid ammonia pump is connected to a second manual ball valve (12); one end of the second manual ball valve (12) is connected to a second liquid ammonia pipe (13) for the inlet of the liquid ammonia pump; one end of the second liquid ammonia pipe (13) for the inlet of the liquid ammonia pump is connected to a second pneumatic valve (14); one end of the second pneumatic valve (14) is connected to a third liquid ammonia pipe (15) for the inlet of the liquid ammonia pump; and a fixing plate (17) is fixedly connected to the bottom of the inner cavity of the liquid ammonia pump control valve group area (103). ), a liquid ammonia working pump (16) is mounted on the fixing plate (17) by means of bolts (18); one side of the liquid ammonia working pump (16) is connected to a liquid ammonia pump cold water pipe (19); the outlet of the liquid ammonia working pump (16) is connected to a first liquid ammonia pipe (20) at the outlet of the liquid ammonia pump; one end of the first liquid ammonia pipe (20) at the outlet of the liquid ammonia pump is connected to a liquid ammonia pump outlet water stop valve (21); one end of the liquid ammonia pump outlet water stop valve (21) is connected to a liquid ammonia pump outlet manual ball valve (22); and one end of the liquid ammonia pump outlet manual ball valve (22) is connected to a second liquid ammonia pipe (23) at the outlet of the liquid ammonia pump.

4. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 3, characterized in that: One end of the second liquid ammonia pipe (23) at the outlet of the liquid ammonia pump is connected to the main liquid ammonia outlet pipe (29); a main pipe flow meter (24) is provided on the surface of the main pipe flow meter (24); a front side ball valve (25) is provided on the surface of the main pipe flow meter (24); a main pipe manual ball valve (26) is provided on one side of the surface of the main liquid ammonia outlet pipe (29); one end of the front side ball valve (25) is connected to the main pipe pneumatic ball valve (27); one end of the main pipe pneumatic ball valve (27) is connected to the rear side ball valve (28); the surface of the front buffer tank pressure stabilizing device (8) is connected to the first liquid ammonia pipe (30) at the inlet of the standby pump; one end of the first liquid ammonia pipe (30) at the inlet of the standby pump is connected to the manual ball valve (31) at the inlet of the standby pump; one end of the manual ball valve (31) at the inlet of the standby pump is connected to the A standby pump inlet pneumatic valve (32) is provided. A connecting plate (34) is installed behind the liquid ammonia working pump (16). A liquid ammonia standby pump (33) is installed on the connecting plate (34). The opening of the liquid ammonia standby pump (33) is connected to a second liquid ammonia pipe (35) at the standby pump outlet. One end of the connecting plate (34) is connected to a standby pump outlet check valve (36). A normal-pressure liquid ammonia outlet manual ball valve (38) is connected to the rear of the surface of the front buffer tank pressure stabilizing device (8). One end of the normal-pressure liquid ammonia outlet manual ball valve (38) is connected to a normal-pressure liquid ammonia outlet pneumatic ball valve (37). The other end of the normal-pressure liquid ammonia outlet manual ball valve (38) is connected to the front buffer tank pressure stabilizing device (8). The normal-pressure liquid ammonia outlet pneumatic ball valve (37) is connected to the second liquid ammonia pipe (35) at the standby pump outlet.

5. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 1, characterized in that: The opening of the second liquid ammonia storage tank (72) is connected to a second liquid ammonia storage tank outlet liquid ammonia pipe (41), the surface of the second liquid ammonia storage tank outlet liquid ammonia pipe (41) is connected to a second liquid ammonia storage tank manual ball valve (39), one end of the second liquid ammonia storage tank outlet liquid ammonia pipe (41) is connected to a second liquid ammonia storage tank outlet pneumatic valve (40), and one end of the second liquid ammonia storage tank outlet pneumatic valve (40) is connected to a front buffer tank pressure stabilizing device (8).

6. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 2, characterized in that: The surface of the second liquid ammonia storage tank (72) is connected to a second liquid ammonia storage tank flexible joint (42); one end of the second liquid ammonia storage tank flexible joint (42) is connected to a second liquid ammonia storage tank fourth liquid ammonia pipe (43); one end of the second liquid ammonia storage tank fourth liquid ammonia pipe (43) is connected to a second liquid ammonia storage tank third manual ball valve (44); the surface of the second liquid ammonia storage tank third manual ball valve (44) is connected to a second liquid ammonia storage tank first return pipe (45); one end of the pre-buffer tank pressure stabilizing device (8) is connected to a pressure stabilizing device purge inlet (46); the surface of the second liquid ammonia storage tank flexible joint (42) is connected to a first liquid ammonia storage tank first return pipe (47); one end of the second liquid ammonia storage tank flexible joint (42) is connected to a total return pipe regulating valve (48); one end of the total return pipe regulating valve (48) is connected to a total return pipe first manual ball valve (49); one end of the total return pipe first manual ball valve (49) is connected to a mass flow meter (50).

7. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 4, characterized in that: The surface of the liquid ammonia pipe (41) at the outlet of the second liquid ammonia storage tank is provided with a liquid ammonia main pipe purge inlet (51); the surface of the second liquid ammonia pipe (35) at the outlet of the standby pump is connected to a pump outlet safety valve (52); one side of the cooling circulation system (107) is respectively connected to a cooling water inlet pipe (53) and a liquid ammonia pump cooling water return pipe (54); one end of the liquid ammonia pump cooling water return pipe (54) is connected to a return pipe flowmeter (55); the surface of the liquid ammonia pump cooling water return pipe (54) is connected to a standby pump cooling water stop valve (56); a standby pump cooling water outlet (57) is provided on the standby pump cooling water stop valve (56); and the opening of the liquid ammonia pump cold water pipe (19) is connected to a working pump cooling water stop valve (58).

8. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 1, characterized in that: A second pressure sensor (59) and a pressure gauge (60) are provided on the surface of the liquid ammonia pipe (41) at the outlet of the second liquid ammonia storage tank; a cooling water circulation pump assembly (61) is installed inside the cooling circulation system (107); a circulation pump water suction pipe (62) is connected to the cooling water circulation pump assembly (61); a water outlet end of the cooling water circulation pump assembly (61) is connected to a circulation pump outlet stop valve (63); one end of the circulation pump outlet stop valve (63) is connected to a circulation pump outlet automatic valve (64); and one end of the circulation pump outlet automatic valve (64) is connected to a circulation pump outlet water pipe (65).

9. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 1, characterized in that: The nitrogen purge system (108) is provided with a first nitrogen bottle (66), a second nitrogen bottle (70) and a third nitrogen bottle (71) inside; one side of the first nitrogen bottle (66) is connected to a nitrogen outlet stop valve (67); the other side of the first nitrogen bottle (66) is connected to a nitrogen outlet check valve (68); and one side of the nitrogen outlet stop valve (67) is connected to a nitrogen pressure regulating valve (69).

10. The liquid ammonia power system in the ammonia storage area for ammonia-blended combustion of a coal-fired boiler according to claim 1, characterized in that: The first liquid ammonia storage tank (1) is connected to a first liquid ammonia reflux pipe flexible joint (73); one end of the first liquid ammonia reflux pipe flexible joint (73) is connected to a first liquid ammonia storage tank fourth pipeline (74); one end of the first liquid ammonia storage tank fourth pipeline (74) is connected to a first liquid ammonia storage tank reflux third manual ball valve (75); one end of the first liquid ammonia storage tank reflux third manual ball valve (75) is connected to a first liquid ammonia storage tank water flow valve (76); one end of the first liquid ammonia storage tank water flow valve (76) is connected to a liquid ammonia reflux second manual ball valve (77); a pressure stabilizing device safety valve (78) is provided on the surface of the first liquid ammonia storage tank fourth pipeline (74); one end of the pressure stabilizing device safety valve (78) is connected to a front buffer tank pressure stabilizing device (8).

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