Liquid ammonia storage tank cooling device and boiler flue gas denitration system

Abstract

The utility model relates to the technical field of liquid ammonia storage, and discloses a liquid ammonia storage tank cooling device and a boiler flue gas denitration system, the liquid ammonia storage tank cooling device comprises a liquid ammonia storage tank, a connecting pipe, an exhaust valve and a first isolating valve; one end of the connecting pipe is communicated with the liquid ammonia storage tank, and the other end of the connecting pipe is communicated with an outlet of the buffer tank; the exhaust valve is arranged on the connecting pipe and is positioned at one end, close to the liquid ammonia storage tank, of the connecting pipe; the first isolating valve is arranged on the connecting pipe and located on the side, away from the liquid ammonia storage tank, of the exhaust valve. According to the technical scheme, the temperature of the liquid ammonia storage tank can be conveniently reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid ammonia storage, in particular to a liquid ammonia storage tank cooling device and a boiler flue gas denitration system. Background Art

[0002] In the boiler flue gas denitration system, the SCR denitration device is usually selected to denitrate the boiler flue gas. During the denitration process, the liquid ammonia stored in the liquid ammonia storage tank is converted into ammonia gas through the evaporator, and then mixed with the dilution air through the buffer tank, and finally discharged to the SCR denitration device for chemical reaction. In the related technology, since the pressure in the liquid ammonia storage tank will increase when the external temperature rises, in order to ensure safety, the tank body of the liquid ammonia storage tank is usually cooled by spraying cold water to achieve internal pressure reduction of the liquid ammonia storage tank. After the spraying water cools the liquid ammonia storage tank, it is treated as wastewater, which will cause a large amount of water resources waste. Utility Model Content

[0003] The main purpose of the utility model is to provide a liquid ammonia storage tank cooling device, aiming to conveniently reduce the temperature of the liquid ammonia storage tank.

[0004] In order to achieve the above-mentioned purpose, the liquid ammonia storage tank cooling device proposed in the utility model comprises:

[0005] Liquid ammonia storage tanks;

[0006] A connecting pipe, one end of which is connected to the liquid ammonia storage tank, and the other end of which is connected to the outlet of the buffer tank;

[0007] an exhaust valve, the exhaust valve being arranged on the connecting pipe, the exhaust valve being located at one end of the connecting pipe close to the liquid ammonia storage tank; and

[0008] A first isolation valve is provided on the connecting pipe, and the first isolation valve is located on a side of the exhaust valve away from the liquid ammonia storage tank.

[0009] Optionally, the liquid ammonia storage tank cooling device further includes a second isolation valve, which is arranged on the connecting pipe and is located on a side of the exhaust valve away from the first isolation valve.

[0010] Optionally, the liquid ammonia storage tank cooling device comprises a plurality of the liquid ammonia storage tanks;

[0011] The connecting pipe includes a connecting mother pipe and a plurality of connecting sub-pipes, one end of each connecting sub-pipe is connected to one end of the connecting mother pipe, and the other end of each connecting sub-pipe is connected to a liquid ammonia storage tank, and each connecting sub-pipe is provided with an exhaust valve and a first isolation valve.

[0012] Optionally, the liquid ammonia storage tank cooling device further includes a pneumatic regulating valve, and the pneumatic regulating valve is arranged on the connecting mother pipe.

[0013] Optionally, the liquid ammonia storage tank cooling device further includes a third isolation valve, which is arranged on the connecting mother pipe and is located on a side of the pneumatic regulating valve close to the connecting sub-pipe.

[0014] Optionally, the liquid ammonia storage tank cooling device further includes a fourth isolation valve, which is arranged on the connecting mother pipe and is located on a side of the pneumatic regulating valve away from the connecting sub-pipe.

[0015] Optionally, the liquid ammonia storage tank cooling device also includes a pressure-stabilizing valve, which is arranged on the connecting mother pipe and located between the pneumatic regulating valve and the fourth isolation valve.

[0016] Optionally, the liquid ammonia storage tank cooling device further includes a temperature sensor, which is disposed on the liquid ammonia storage tank and is used to detect the temperature of the liquid ammonia storage tank.

[0017] Optionally, the liquid ammonia storage tank cooling device further includes a controller, and the exhaust valve and the temperature sensor are both electrically connected to the controller.

[0018] The utility model also provides a boiler flue gas denitration system, and the boiler flue gas denitration system comprises the above-mentioned liquid ammonia storage tank cooling device.

[0019] In the technical solution of the utility model, when the outside temperature rises, the first isolation valve can be closed, and then the exhaust valve can be opened to discharge the ammonia gas in the liquid ammonia storage tank to the outside. After the ammonia gas is discharged, it can absorb the heat in the external environment of the liquid ammonia storage tank, so that the outside temperature drops. In this way, the temperature of the liquid ammonia storage tank is reduced while the internal pressure of the liquid ammonia storage tank is reduced, which is beneficial to the safety of liquid ammonia storage. In addition, by opening the first isolation valve and closing the exhaust valve, the ammonia gas in the liquid ammonia storage tank can be transmitted to the outlet of the buffer tank through the connecting pipe, and then mixed with the ammonia gas that has been treated and drummed in the buffer tank for use by the SCR denitration device, reducing the waste of ammonia gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1This is a structural schematic diagram of an embodiment of a boiler flue gas denitrification system provided by the utility model.

[0022] Description of Figure Numbers:

[0023] Label name Label name 1000 Boiler flue gas denitrification system 7 Pneumatic control valve 1 Liquid ammonia storage tank 8 The third isolation valve 2 Connecting mother pipe 9 Fourth isolation valve 3 Connecting pipe 10 Pressure regulating valve 4 Exhaust valve 11 Buffer tank 5 First isolation valve 12 Evaporator 6 Second isolation valve

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to Figure 1 The utility model proposes a liquid ammonia storage tank cooling device, comprising a liquid ammonia storage tank 1, a connecting pipe, an exhaust valve 4 and a first isolation valve 5; one end of the connecting pipe is connected to the liquid ammonia storage tank 1, and the other end of the connecting pipe is used to be connected to the outlet of the buffer tank 11; the exhaust valve 4 is arranged on the connecting pipe, and the exhaust valve 4 is located at one end of the connecting pipe close to the liquid ammonia storage tank 1; the first isolation valve 5 is arranged on the connecting pipe, and the first isolation valve 5 is located on the side of the exhaust valve 4 away from the liquid ammonia storage tank 1.

[0029] In this embodiment, when the outside temperature rises, the first isolation valve 5 can be closed, and then the exhaust valve 4 can be opened to discharge the ammonia gas in the liquid ammonia storage tank 1 to the outside. After the ammonia gas is discharged, it can absorb the heat in the outside environment of the liquid ammonia storage tank 1, so that the outside temperature drops. In this way, the temperature of the liquid ammonia storage tank 1 is reduced while the internal pressure of the liquid ammonia storage tank 1 is reduced, which is beneficial to the safety of liquid ammonia storage. In addition, by opening the first isolation valve 5 and closing the exhaust valve 4, the ammonia gas in the liquid ammonia storage tank 1 can be transmitted to the outlet of the buffer tank 11 through the connecting pipe, and then mixed with the ammonia gas treated by the buffer tank 11 for use by the SCR denitration device, thereby reducing the waste of ammonia gas.

[0030] Further, in one embodiment of the present invention, please refer to Figure 1 The liquid ammonia storage tank cooling device further includes a second isolation valve 6, which is arranged on the connecting pipe and is located on the side of the exhaust valve 4 away from the first isolation valve 5. The second isolation valve 6 can isolate the flow of ammonia when necessary, so that ammonia cannot flow from the liquid ammonia storage tank 1 to the exhaust valve 4 for discharge. Therefore, when the outside temperature is normal, the second isolation valve 6 can be closed to avoid the ammonia in the liquid ammonia storage tank 1 from being discharged from the exhaust valve 4 and causing waste. When the outside temperature rises, the second isolation valve 6 can be opened, and the exhaust valve 4 can be opened at the same time. At this time, the ammonia in the liquid ammonia storage tank 1 can be discharged to the outside through the exhaust valve 4 to absorb heat, so as to reduce the outside temperature, and at the same time reduce the air pressure in the liquid ammonia storage tank 1, so as to ensure the safety of liquid ammonia storage.

[0031] It is understandable that in actual use, there will be multiple liquid ammonia storage tanks 1 for storing liquid ammonia at the same time, and each liquid ammonia storage tank 1 will have internal pressure increase. Therefore, in one embodiment of the present utility model, please refer to Figure 1 The connecting pipe includes a connecting mother pipe 2 and a plurality of connecting sub-pipes 3. One end of each connecting sub-pipe 3 is connected to one end of the connecting mother pipe 2, and the other end of each connecting sub-pipe 3 is connected to a liquid ammonia storage tank 1. Each connecting sub-pipe 3 is provided with an exhaust valve 4 and a first isolation valve 5. The other end of the connecting mother pipe 2 is connected to the outlet of the buffer tank 11. By providing a plurality of connecting sub-pipes 3, each liquid ammonia storage tank 1 is relatively independent, and exhaust work of different liquid ammonia storage tanks 1 can be performed at different times, or exhaust work of multiple liquid ammonia storage tanks 1 can be performed simultaneously. The specific implementation can be selected according to the actual temperature situation. Among them, an exhaust valve 4 and a first isolation valve 5 are provided on each connecting sub-pipe 3, so that the cooling process of each liquid ammonia storage tank 1 can be independently controlled, and the linkage cooling between the liquid ammonia storage tanks 1 is realized, which improves the stability and operational flexibility of the system.

[0032] Since one end of the connecting mother pipe 2 is connected with multiple connecting sub-pipes 3, the other end of the connecting mother pipe 2 is connected with the outlet management of the buffer tank 11, that is, the ammonia in the multiple connecting sub-pipes 3 will flow to the outlet pipeline of the buffer tank 11 after merging in the connecting mother pipe 2. At this time, if the pressure in the connecting mother pipe 2 is too high, the ammonia in the connecting mother pipe 2 will quickly flow to the outlet pipeline of the buffer tank 11, which may affect the normal denitration work. Therefore, in one embodiment of the utility model, the liquid ammonia storage tank cooling device also includes a pneumatic regulating valve 7, please refer to Figure 1 The pneumatic regulating valve 7 is arranged on the connecting mother pipe 2. The pneumatic regulating valve 7 can adjust the ammonia flow in the connecting mother pipe 2 to realize the pressure control of the connecting mother pipe 2, thereby avoiding the excessive pressure in the connecting mother pipe 2 affecting the normal denitration work.

[0033] Further, in one embodiment of the present invention, please refer to Figure 1 The liquid ammonia storage tank cooling device further includes a third isolation valve 8, which is arranged on the connecting mother pipe 2. The third isolation valve 8 is located on the side of the pneumatic regulating valve 7 close to the connecting sub-pipe 3. In this way, before adjusting the pneumatic regulating valve 7, the third isolation valve 8 can be closed to prevent the ammonia gas in the connecting sub-pipe 3 from flowing to the pneumatic regulating valve 7. After adjusting the pneumatic regulating valve 7, the third isolation valve 8 is opened to connect the connecting sub-pipe 3 with the connecting mother pipe 2, and the ammonia gas in the connecting sub-pipe 3 can flow to the outlet pipeline of the buffer tank 11 through the connecting mother pipe 2.

[0034] Furthermore, in one embodiment of the present invention, please refer to Figure 1 The liquid ammonia storage tank cooling device further includes a fourth isolation valve 9, which is arranged on the connecting mother pipe 2 and is located on the side of the pneumatic regulating valve 7 away from the connecting sub-pipe 3. The fourth isolation valve 9 can open or cut off the outlet pipeline of the pneumatic regulating valve 7 and the buffer tank 11 to control the communication between the connecting mother pipe 2 and the outlet pipeline of the buffer tank 11.

[0035] There are many types of isolation valves. In one embodiment of the present invention, the first isolation valve 5, the second isolation valve 6, the third isolation valve 8 and the fourth isolation valve 9 are all isolation ball valves. The isolation ball valve has a compact structure, fast opening and closing, a large flow adjustment range and a small operating torque.

[0036] In order to ensure that the pressure in the connecting mother pipe 2 is normal, in one embodiment of the present utility model, please refer to Figure 1 The liquid ammonia storage tank cooling device also includes a pressure stabilizing valve 10, which is arranged on the connecting mother pipe 2. The pressure stabilizing valve 10 is located between the pneumatic regulating valve 7 and the fourth isolation valve 9. The ammonia gas with unstable pressure inside the connecting mother pipe 2 can be converted into a stable airflow after flowing through the pressure stabilizing valve 10 to ensure the stability of the ammonia pressure in the outlet pipeline flowing to the buffer tank 11.

[0037] Furthermore, in one embodiment of the utility model, the liquid ammonia storage tank cooling device also includes a temperature sensor, and the temperature sensor is arranged on the liquid ammonia storage tank 1. The temperature of the liquid ammonia storage tank 1 can be detected in real time by the temperature sensor, so that when the temperature rises, the temperature can be cooled in time to ensure the safety of liquid ammonia storage.

[0038] Furthermore, in one embodiment of the utility model, the liquid ammonia storage tank cooling device also includes a controller, and the exhaust valve 4 and the temperature sensor are electrically connected to the controller. By setting the controller, when the temperature sensor detects that the temperature of the liquid ammonia storage tank 1 increases, the temperature information can be transmitted to the controller, and then the controller can control the exhaust valve 4 to open, so that the ammonia gas in the liquid ammonia storage tank 1 is discharged to absorb the heat outside the liquid ammonia storage tank 1, thereby achieving a cooling effect and realizing automatic adjustment and control of the temperature of the liquid ammonia storage tank 1.

[0039] Please refer to Figure 1 The utility model also proposes a boiler flue gas denitrification system 1000. In the boiler flue gas denitrification system 1000, liquid ammonia is converted into ammonia gas through an evaporator 12, and is discharged to an SCR denitrification device after being processed in a buffer tank 11. The boiler flue gas denitrification system 1000 includes the above-mentioned liquid ammonia storage tank cooling device. The connecting pipe of the liquid ammonia storage tank cooling device is connected to the outlet pipeline of the buffer tank 11 to improve the utilization rate of ammonia gas. The specific structure of the liquid ammonia storage tank cooling device refers to the above-mentioned embodiment. Since the boiler flue gas denitrification system 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0040] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid ammonia storage tank cooling device, characterized in that: include: Liquid ammonia storage tanks; A connecting pipe, one end of which is connected to the liquid ammonia storage tank, and the other end of which is connected to the outlet of the buffer tank; An exhaust valve, the exhaust valve is arranged on the connecting pipe, and the exhaust valve is located at one end of the connecting pipe close to the liquid ammonia storage tank; as well as A first isolation valve is provided on the connecting pipe, and the first isolation valve is located on a side of the exhaust valve away from the liquid ammonia storage tank.

2. The liquid ammonia storage tank cooling device according to claim 1, characterized in that: The liquid ammonia storage tank cooling device also includes a second isolation valve, which is arranged on the connecting pipe and is located on a side of the exhaust valve away from the first isolation valve.

3. The liquid ammonia storage tank cooling device according to claim 1, characterized in that: The liquid ammonia storage tank cooling device comprises a plurality of the liquid ammonia storage tanks; The connecting pipe includes a connecting mother pipe and a plurality of connecting sub-pipes, one end of each connecting sub-pipe is connected to one end of the connecting mother pipe, and the other end of each connecting sub-pipe is connected to a liquid ammonia storage tank, and each connecting sub-pipe is provided with an exhaust valve and a first isolation valve.

4. The liquid ammonia storage tank cooling device according to claim 3, characterized in that: The liquid ammonia storage tank cooling device also includes a pneumatic regulating valve, which is arranged on the connecting mother pipe.

5. The liquid ammonia storage tank cooling device according to claim 4, characterized in that: The liquid ammonia storage tank cooling device also includes a third isolation valve, which is arranged on the connecting mother pipe and is located on a side of the pneumatic regulating valve close to the connecting sub-pipe.

6. The liquid ammonia storage tank cooling device according to claim 4, characterized in that: The liquid ammonia storage tank cooling device also includes a fourth isolation valve, which is arranged on the connecting mother pipe and is located on a side of the pneumatic regulating valve away from the connecting sub-pipe.

7. The liquid ammonia storage tank cooling device according to claim 6, characterized in that: The liquid ammonia storage tank cooling device also includes a pressure stabilizing valve, which is arranged on the connecting mother pipe and is located between the pneumatic regulating valve and the fourth isolation valve.

8. The liquid ammonia storage tank cooling device according to claim 1, characterized in that: The liquid ammonia storage tank cooling device also includes a temperature sensor, which is arranged on the liquid ammonia storage tank and is used to detect the temperature of the liquid ammonia storage tank.

9. The liquid ammonia storage tank cooling device according to claim 8, characterized in that: The liquid ammonia storage tank cooling device also includes a controller, and the exhaust valve and the temperature sensor are both electrically connected to the controller.

10. A boiler flue gas denitrification system, characterized in that: The boiler flue gas denitrification system includes a liquid ammonia storage tank cooling device as described in any one of claims 1 to 9.

Images