Ammonia supply system of ultralow-temperature denitration device

Abstract

The utility model discloses an ammonia supply system of an ultralow-temperature denitration device. The ammonia supply system comprises an ammonia water supply module and an ammonia water evaporation module, the ammonia water supply module comprises an ammonia water storage tank, a liquid seal tank and a sewage pool, the ammonia water storage tank is provided with an ammonia water access pipeline, a spraying water inlet pipeline, an inner ammonia supply pipeline, a liquid seal pipe and a blow-off pipe, and the ammonia water access pipeline is provided with two branch pipes which are respectively connected with an outer ammonia supply pipeline and an ammonia water transport vehicle; the liquid seal pipe is connected with the top of the ammonia water storage tank and the bottom of the liquid seal tank, and the blow-off pipe is connected into a sewage pool; the ammonia water evaporation module comprises an evaporation tank, the internal ammonia supply pipeline is connected with the ammonia water storage tank and the evaporation tank, the bottom of the evaporation tank is connected with a hot air pipeline, an ammonia spraying pipeline is arranged at the top of the evaporation tank, and the ammonia spraying pipeline is connected into a reaction furnace of the ultralow-temperature denitration device. According to the mode, the ammonia supply stability can be improved, disturbance to the environment in the reaction furnace is reduced, and the reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of flue gas denitration, in particular to an ammonia supply system of an ultra-low temperature denitration device. Background Art

[0002] Ultra-low temperature flue gas denitrification technology refers to the use of ammonia water or ammonia gas to remove NO in flue gas under the catalytic conditions of a low temperature range of 120-300℃. x Reduction to nitrogen. In this process, the flue gas entering the denitrification system must first be heated to the reaction temperature before the reaction can continue. Therefore, in the actual reaction process, ammonia molecules need to be stably supplied to the reactor. The commonly used ammonia supply method is to directly sprinkle high-concentration ammonia water into the furnace after combustion by spraying. However, the ammonia water directly enters the furnace, rapidly absorbs the heat in the furnace and then vaporizes at high temperature. This process will cause local temperature disturbances in the entry area, making the temperature in the furnace unstable and affecting the subsequent denitrification reaction, especially the reaction effect of the first catalytic bed. Therefore, it is necessary to optimize the existing ammonia supply system to ensure supply stability while reducing the impact of ammonia molecules on the ambient temperature when entering the reactor. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide an ammonia supply system for an ultra-low temperature denitration device, which can improve the reliability of ammonia supply while preheating and evaporating ammonia water, reduce environmental disturbances in the reactor, and improve reaction efficiency.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an ammonia supply system for an ultra-low temperature denitration device, the ammonia supply system of the ultra-low temperature denitration device comprising: an ammonia water supply module and an ammonia water evaporation module, the ammonia water supply module and the ammonia water evaporation module are connected through an internal ammonia supply pipeline, the ammonia water evaporation module is connected to the reaction furnace of the ultra-low temperature denitration device; the ammonia water supply module comprises an ammonia water storage tank, a liquid seal tank and a sewage pool, the ammonia water storage tank is provided with an ammonia water access pipeline, a spray water inlet pipeline, an internal ammonia supply pipeline, a liquid seal pipe and a sewage pipe, the ammonia water access pipeline is provided with two branch pipes, the two branch pipes are respectively connected to the external ammonia supply pipeline and the ammonia water transport vehicle, the liquid seal tank One end of the pipe is arranged on the top of the ammonia storage tank, and the other end is connected to the bottom of the liquid-sealed tank. A water inlet pipe is arranged on the top of the liquid-sealed tank. There are a plurality of internal ammonia supply pipes, which are connected in parallel with the ammonia storage tank and the ammonia evaporation module. One end of the sewage pipe is installed near the bottom of the ammonia storage tank, and the other end is connected to the sewage pool. The ammonia evaporation module includes an evaporation tank, and the plurality of internal ammonia supply pipes are all connected to the evaporation tank. The bottom of the evaporation tank is connected to a hot air pipe, and an ammonia spraying pipe is arranged on the top of the evaporation tank. A plurality of ammonia inlets are arranged on the furnace body of the reactor of the ultra-low temperature denitration device, and a corresponding number of branch pipes are arranged on the ammonia spraying pipe, which are connected one by one with the plurality of ammonia inlets.

[0005] In a preferred embodiment of the utility model, an emergency water pipeline is also provided on the top of the ammonia water storage tank.

[0006] In a preferred embodiment of the present invention, there are two ammonia water storage tanks, and the two ammonia water storage tanks can be used in parallel and alternately.

[0007] In a preferred embodiment of the present invention, a branch pipe is provided on the external ammonia supply pipeline, and the branch pipe can be directly connected to the internal ammonia supply pipeline.

[0008] In a preferred embodiment of the utility model, an air pressure balance pipe is further provided between the ammonia water transport vehicle and the ammonia water storage tank, and the air pressure balance pipe connects the top of the ammonia water storage tank and the top of the tank body on the ammonia water transport vehicle.

[0009] In a preferred embodiment of the present invention, a first booster pump group is provided on the main pipe of the ammonia water access pipeline, and the first booster pump group includes two booster pumps arranged in parallel.

[0010] In a preferred embodiment of the present invention, a second booster pump group is installed on each internal ammonia supply pipeline, and each second booster pump group includes two booster pumps arranged in parallel.

[0011] In a preferred embodiment of the present invention, a water return loop is further provided between the second booster pump unit and the ammonia water evaporation module, and the water return loop is reconnected to the ammonia water storage tank.

[0012] In a preferred embodiment of the utility model, a blower unit is installed on the hot air duct, and the blower unit includes two blowers, and the two blowers are arranged in parallel on the hot air duct. A circulating cooling pipeline is also provided on the blower unit, and the circulating cooling pipeline includes a cooling water inlet pipeline and a cooling water outlet pipeline. The cooling water inlet pipeline is connected to the two blowers at the same time through two branch pipes, and the cooling water outlet pipeline is also connected to the two blowers at the same time through two branch pipes.

[0013] The beneficial effects of the utility model are as follows: the utility model optimizes the ammonia supply system in the existing flue gas denitrification device. On the one hand, two ammonia water storage tanks are arranged in parallel to ensure the stability of the overall ammonia supply. On the other hand, the ammonia water is heated and evaporated by high-temperature air before entering the reactor, so that the temperature of the mixed steam entering the reactor is close to or even exceeds 120°C, thereby effectively reducing the disturbance of the furnace environment when the ammonia water enters the reactor, improving the reaction efficiency of the catalyst bed, and reducing NO x The escape of molecules improves the overall effect of denitrification. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic diagram of the ammonia water input structure in a preferred embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the ammonia water heating structure in a preferred embodiment of the utility model;

[0016] The markings of the components in the accompanying drawings are as follows:

[0017] 1. Reactor, 2. Ammonia transport vehicle, 3. Ammonia storage tank, 4. Liquid seal tank, 5. Evaporation tank, 6. Sewage tank, 7.

[0018] 1. The first booster pump group, 8. The second booster pump group, 9. The blower group, 10. The external ammonia supply pipeline, 11. The spray water inlet pipeline, 12. The water inlet pipeline, 13. The emergency water pipeline, 14. The internal ammonia supply pipeline, 15. The ammonia spray pipeline, 16. The hot air pipeline, 17. The cooling water inlet pipeline, 18. The cooling water outlet pipeline, 19. The sewage pipe. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0020] See also Figure 1 and Figure 2 , the utility model embodiment includes:

[0021] An ammonia supply system for an ultra-low temperature denitration device, the ammonia supply system for the ultra-low temperature denitration device comprising: an ammonia water supply module and an ammonia water evaporation module, the ammonia water supply module and the ammonia water evaporation module are connected via an internal ammonia supply pipeline 14, the ammonia water evaporation module is connected to the reaction furnace 1 of the ultra-low temperature denitration device; the ammonia water supply module comprises an ammonia water storage tank 3, a liquid seal tank 4 and a sewage pool 6, there are two ammonia water storage tanks 3, the two ammonia water storage tanks 3 can be switched in parallel and used alternately to improve the reliability of the entire system, each ammonia water storage tank 3 is provided with an ammonia water access pipeline, a spray water inlet pipeline 11, an internal ammonia supply pipeline 14, a liquid seal pipe and a sewage pipe 15, the ammonia water access pipeline is provided with two branch pipes, the two branch pipes are respectively connected to an external ammonia supply pipeline 10 and an ammonia water transport vehicle 2, the liquid seal One end of the pipe is arranged at the top of the ammonia storage tank 3, and the other end is connected to the bottom of the liquid-sealed tank. The top of the liquid-sealed tank is provided with a water inlet pipe 12. There are three internal ammonia supply pipes 14, which are connected in parallel with the ammonia storage tank 3 and the ammonia evaporation module. One end of the sewage pipe 19 is installed at a position close to the bottom of the ammonia storage tank 3, and the other end is connected to the sewage pool 6; the ammonia evaporation module includes an evaporation tank 5, and the three internal ammonia supply pipes 14 are simultaneously connected to the evaporation tank 7 through a cross interface. The bottom of the evaporation tank 7 is connected to a hot air pipe 16, and an ammonia spray pipe 15 is arranged on the top of the evaporation tank 5. A plurality of ammonia inlets are arranged on the furnace body of the reaction furnace 1 of the ultra-low temperature denitration device, and a corresponding number of branch pipes are arranged on the ammonia spray pipe 15, which are connected one by one with the plurality of ammonia inlets.

[0022] An emergency water pipe 13 is also provided on the top of the ammonia water storage tank 3, so that when necessary, the ammonia water storage tank 3 can be temporarily waterproofed through the emergency water pipe 13 to prevent ammonia gas from escaping and polluting the surrounding environment.

[0023] The external ammonia supply pipeline 10 is provided with a branch pipe, and the branch pipe can be directly connected to the internal ammonia supply pipeline 14. In this way, when necessary, such as when the ammonia water storage tank 3 is overhauled, ammonia can be directly supplied through the external ammonia supply pipeline 10.

[0024] A pressure balance pipe is also provided between the ammonia water transport vehicle 2 and the ammonia water storage tank 3, and the pressure balance pipe connects the top of the ammonia water storage tank 3 and the top of the tank body on the ammonia water transport vehicle 2. By providing the pressure balance pipe, the ammonia water in the storage tank on the ammonia water transport vehicle 2 can be smoothly pumped into the ammonia water storage tank 3.

[0025] The main pipe of the ammonia water access pipeline is provided with a first booster pump group 7, and the first booster pump group 7 includes two booster pumps arranged in parallel. The first booster pump group 7 can be conveniently used to pump ammonia water into the ammonia water storage tank 3, and the two booster pumps arranged in parallel can still work normally when one of them fails.

[0026] A second booster pump group 8 is installed on each internal ammonia supply pipeline 14, and there are three second booster pump groups 8 in total. Each second booster pump group 8 includes two booster pumps arranged in parallel. The second booster pump group 8 can be used to transport ammonia water to the evaporation tank 5 to prevent unstable pressure and water volume fluctuations during the transportation process. In addition, the two booster pumps arranged in parallel can still complete the work normally when one of them fails. A return water loop is also provided between the second booster pump group 8 and the ammonia water evaporation module, and the return water loop is reconnected to the ammonia water storage tank 3. In this way, when the valve on the internal ammonia supply pipeline 14 is mistakenly closed during the actual ammonia water transportation process or the pressure is too high during the ammonia water transportation, the ammonia water can re-enter the ammonia water storage tank 3 along the return water loop, effectively preventing the pressure in the internal ammonia supply pipeline 14 from being too high, causing pipe bursts and other failures.

[0027] The hot air duct 16 is provided with a blower unit 9, which includes two blowers, and the two blowers are arranged in parallel on the hot air duct 16. The blower unit 9 is also provided with a circulating cooling pipeline, which includes a cooling water inlet pipeline 17 and a cooling water outlet pipeline 18. The cooling water inlet pipeline 17 is connected to the two blowers at the same time through two branch pipes, and the cooling water outlet pipeline 18 is also connected to the two blowers at the same time through two branch pipes. Through this structure, in actual operation, high-temperature gas can be blown into the evaporation tank 5 to mix with ammonia water to quickly increase the temperature in the tank, so that the ammonia water evaporates as a whole, and the working effect is ensured. At the same time, the bearings of the blower unit 9 are cooled through the circulating cooling pipeline to prevent overheating damage in the blower, and the two blowers arranged in parallel can still complete the work normally when one of them fails, thereby improving the stability of system operation.

[0028] As a part of the ultra-low temperature denitrification device, the utility model not only ensures the stability of ammonia supply during operation by arranging multiple ammonia supply lines in parallel, but also evaporates and preheats the ammonia water before it enters the reaction furnace 1, thereby effectively improving the stability of the temperature environment in the furnace body, reducing the heat loss of the furnace body, and improving the overall reaction efficiency.

[0029] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An ammonia supply system for an ultra-low temperature denitration device, characterized in that: The ammonia supply system of the ultra-low temperature denitration device comprises: an ammonia water supply module and an ammonia water evaporation module, wherein the ammonia water supply module and the ammonia water evaporation module are connected via an internal ammonia supply pipeline, and the ammonia water evaporation module is connected to the reaction furnace of the ultra-low temperature denitration device; The ammonia supply module comprises an ammonia storage tank, a liquid-sealed tank and a sewage pool. The ammonia storage tank is provided with an ammonia access pipeline, a spray water inlet pipeline, an internal ammonia supply pipeline, a liquid-sealed pipe and a sewage pipe. The ammonia access pipeline is provided with two branch pipes, which are respectively connected to an external ammonia supply pipeline and an ammonia transport vehicle. One end of the liquid-sealed pipe is arranged on the top of the ammonia storage tank, and the other end is connected to the bottom of the liquid-sealed tank. The top of the liquid-sealed tank is provided with a water inlet pipeline. There are a plurality of internal ammonia supply pipelines, which are connected in parallel with the ammonia storage tank and the ammonia evaporation module. One end of the sewage pipe is installed at a position close to the bottom of the ammonia storage tank, and the other end is connected to the sewage pool. The ammonia evaporation module comprises an evaporation tank, the plurality of internal ammonia supply pipelines are all connected to the evaporation tank, the bottom of the evaporation tank is connected to a hot air pipeline, the top of the evaporation tank is provided with an ammonia spraying pipeline, a plurality of ammonia access ports are arranged on the furnace body of the reactor of the ultra-low temperature denitration device, and a corresponding number of branch pipes are arranged on the ammonia spraying pipeline, which are connected one by one with the plurality of ammonia access ports.

2. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: An emergency water pipeline is also provided on the top of the ammonia water storage tank.

3. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: There are two ammonia water storage tanks in total, and the two ammonia water storage tanks can be used alternately in parallel.

4. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: The external ammonia supply pipeline is provided with a branch pipe, and the branch pipe can be directly connected to the internal ammonia supply pipeline.

5. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: An air pressure balance pipe is also provided between the ammonia water transport vehicle and the ammonia water storage tank, and the air pressure balance pipe connects the top of the ammonia water storage tank and the top of the tank body on the ammonia water transport vehicle.

6. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: A first booster pump group is arranged on the main pipe of the ammonia water access pipeline, and the first booster pump group includes two booster pumps arranged in parallel.

7. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: A second booster pump group is installed on each internal ammonia supply pipeline, and each second booster pump group includes two booster pumps arranged in parallel.

8. The ammonia supply system of the ultra-low temperature denitration device according to claim 7, characterized in that: A water return loop is also provided between the second booster pump unit and the ammonia water evaporation module, and the water return loop is reconnected to the ammonia water storage tank.

9. The ammonia supply system of the ultra-low temperature denitration device according to claim 1, characterized in that: A blower unit is installed on the hot air duct, and the blower unit includes two blowers, and the two blowers are arranged in parallel on the hot air duct.

10. The ammonia supply system of the ultra-low temperature denitration device according to claim 9, characterized in that: The blower unit is also provided with a circulating cooling pipeline, which includes a cooling water inlet pipeline and a cooling water outlet pipeline. The cooling water inlet pipeline is simultaneously connected to two blowers through two branch pipes, and the cooling water outlet pipeline is also simultaneously connected to two blowers through two branch pipes.

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