Low-ammonia denitration device

Abstract

The utility model discloses a low-ammonia denitration device which comprises a kiln tail smoke chamber, a decomposing furnace is connected above the kiln tail smoke chamber, the decomposing furnace is connected with a treatment tank, an ammonia water pipe is sleeved on the surface of the treatment tank, a joint is arranged on the ammonia water pipe, the ammonia water pipe is communicated with the inside of the treatment tank, the lower end of the treatment tank is connected with a transfer pipe, and the transfer pipe is communicated with the inside of the treatment tank. The other end of the adapter pipe is connected with a condenser, the upper part of the condenser is connected with a gas-liquid separator, the lower surface of the adapter pipe is connected with a recovery pipe, the lower part of the surface of the condenser is connected with a return pipe, and the return pipe is communicated with the recovery pipe. The ammonia water on the liquid beads entering the gas-liquid separator along with the flowing of the flue gas is re-gathered to form the ammonia water under the action of the gas-liquid separator and can also be reused, so that the consumption of the ammonia water can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology, specifically a low-ammonia denitrification device. Background Technology

[0002] Currently, the denitrification process used in cement kilns is mostly SNCR denitrification technology, which has relatively low construction and operating costs. However, SNCR technology has low denitrification efficiency, and the consumption of ammonia water as a denitrification agent is huge. If used improperly, it will increase the ammonia escape rate in the flue gas, increase the system heat consumption and denitrification costs, and at the same time, it will also cause corrosion to equipment and pipelines, posing a triple hazard to equipment, safety and environmental protection.

[0003] To address the aforementioned issues, a solution for a low-ammonia denitrification device (publication number CN220589536U) has been developed. By incorporating a ring pipe, branch pipes, and ammonia spray guns, the ammonia injection layout is optimized, achieving a combination of high-efficiency ammonia injection and low-ammonia denitrification technology. The optimized layout of the ammonia injection system involves installing four ammonia spray guns at the decomposition furnace outlet, reducing the injection volume of each individual gun and improving the denitrification effect.

[0004] However, the above solution improves the denitrification effect by using multiple ammonia spray guns to denitrify before the flue gas is discharged. However, the high temperature of the flue gas will cause some of the ammonia to vaporize and be discharged with the flue gas, resulting in insufficient utilization efficiency of the ammonia. Moreover, this way of discharging flue gas means that some useful ammonia cannot be recovered, resulting in a large consumption of ammonia. Utility Model Content

[0005] The purpose of this invention is to provide a low-ammonia denitrification device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-ammonia denitrification device, including a kiln tail flue chamber, a decomposition furnace connected above the kiln tail flue chamber, a treatment tank connected to the decomposition furnace, an ammonia water pipe sleeved on the surface of the treatment tank, and a connector provided on the ammonia water pipe, the ammonia water pipe communicating with the inside of the treatment tank, the decomposition furnace effectively reducing nitrogen oxides in the kiln tail flue chamber into nitrogen gas, thereby reducing the emission of harmful flue gas;

[0007] The lower end of the processing tank is connected to a transfer pipe, and the other end of the transfer pipe is connected to a condenser. The upper part of the condenser is connected to a gas-liquid separator. The lower surface of the transfer pipe is connected to a recovery pipe, and the lower part of the condenser surface is connected to a return pipe, which is connected to the recovery pipe.

[0008] The vaporized ammonia water is reliquefied in the condenser, realizing the recycling and reuse of ammonia water and reducing the amount of ammonia water used. The gas-liquid separator can recover ammonia water in the form of small liquid droplets.

[0009] Further, the kiln tail smoke chamber lower surface is connected with a heat preservation shell, the heat preservation shell lower surface is connected with a slag discharge port, the heat preservation shell can collect coal slag, the waste heat of the coal slag is utilized, and the heat energy utilization efficiency is improved.

[0010] Further, the ammonia water pipe is connected with a branch pipe, the branch pipe is inserted into the treatment tank and is connected with a plurality of spray heads arranged in a ring shape, the spraying range and density of the ammonia water are improved, and the denitrification effect is good.

[0011] Further, the gas-liquid separator is connected with a discharge pipe and a blowdown pipe, the discharge pipe is used to extract ammonia water for reuse, and the ammonia water utilization efficiency is improved.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) the condenser reduces the flue gas temperature, the gasified ammonia water enters the condenser, is restored to liquid state, and flows to the recovery pipe along the reflux pipe for recovery, a part of the ammonia water flowing into the liquid beads in the gas-liquid separator is re-collected to form ammonia water under the action of the gas-liquid separator, and the ammonia water can be reused, thereby reducing the consumption of ammonia water.

[0014] (2) the treatment tank and the decomposition furnace are independently arranged, the ammonia water can avoid affecting the work of the coal injection burner, and the sprayed excess ammonia water can be conveniently recovered, so that the effects and purposes of energy saving, consumption reduction, emission reduction and environment protection are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the overall structure schematic view of the utility model;

[0016] Figure 2 It is the structure schematic view of the ammonia water pipe and the spray head connection of the utility model;

[0017] Figure 3 It is the structure schematic view of the condenser inside of the utility model.

[0018] In the drawing: 1, heat preservation shell; 2, slag discharge port; 3, kiln tail smoke chamber; 4, decomposition furnace; 5, coal injection burner; 6, tertiary air pipe; 7, treatment tank; 8, ammonia water pipe; 9, branch pipe; 10, adapter pipe; 11, recovery pipe; 12, condenser; 13, gas-liquid separator; 14, discharge pipe; 15, reflux pipe; 16, joint; 17, spray head; 18, spiral pipe; 19, adapter; 20, blowdown pipe. DETAILED DESCRIPTION

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example:

[0021] Please see Figures 1-3 This utility model provides a technical solution: a low ammonia denitrification device, including a kiln tail smoke chamber 3, a decomposition furnace 4 connected above the kiln tail smoke chamber 3, a processing tank 7 connected to the decomposition furnace 4, an ammonia water pipe 8 sleeved on the surface of the processing tank 7, and a connector 16 provided on the ammonia water pipe 8, and the ammonia water pipe 8 communicates with the inside of the processing tank 7.

[0022] The flue gas discharged from the kiln tail flue 3 enters the decomposition furnace 4, where the flue gas is denitrified. In the treatment tank 7, the flue gas is denitrified chemically. The annular ammonia water pipe 8 provides comprehensive spraying to the treatment tank 7, which can achieve more comprehensive denitrification of the flue gas.

[0023] The lower end of the treatment tank 7 is connected to a transfer pipe 10, and the other end of the transfer pipe 10 is connected to a condenser 12. The upper part of the condenser 12 is connected to a gas-liquid separator 13. The lower surface of the transfer pipe 10 is connected to a recovery pipe 11. The lower part of the surface of the condenser 12 is connected to a return pipe 15, and the return pipe 15 is connected to the recovery pipe 11. The condenser 12 cools the flue gas and gaseous ammonia water, so that the gaseous ammonia water is reliquefied, which is convenient for recycling.

[0024] In this embodiment, as Figure 1 As shown, the surface of the decomposition furnace 4 is connected to a pulverized coal burner 5 and a tertiary air duct 6 located above the pulverized coal burner 5. Through the combination of the pulverized coal burner 5, the tertiary air duct 6, and coal, a NOx adsorbent is generated, which adsorbs the NOx generated in the kiln tail flue chamber 3 and at the same time inhibits the process of NOx brought by fuel during the combustion of the decomposition furnace 4.

[0025] In this embodiment, as Figure 1 As shown, the lower surface of the kiln tail flue 3 is connected to an insulation shell 1, and the lower surface of the insulation shell 1 is connected to a slag discharge port 2. The slag produced by the pulverized coal burner 5 is concentrated in the insulation shell 1, so that the residual heat of the slag is concentrated and utilized. The slag that has been fully burned can be judged through the slag discharge port 2.

[0026] In this embodiment, as Figure 1 and Figure 2As shown, the ammonia water pipe 8 is connected to a branch pipe 9, which is inserted into the treatment tank 7 and connected to a nozzle 17. The nozzle 17 sprays ammonia water into the treatment tank 7 in a mist form, which makes more thorough contact with the flue gas and ensures that the flue gas is fully denitrified.

[0027] In this embodiment, as Figure 3 As shown, the condenser 12 is equipped with a spiral tube 18 inside. The spiral tube 18 is connected to two ends with adapters 19, and the adapters 19 pass through the condenser 12. Water is sent into the spiral tube 18 through the adapters 19. When the high-temperature flue gas and high-temperature gaseous ammonia water come into contact with the spiral tube 18, the temperature can be reduced, so that the gaseous ammonia water is restored to a liquid state.

[0028] In this embodiment, as Figure 1 As shown, the gas-liquid separator 13 is connected to a discharge pipe 14 and a sewage pipe 20. The sewage pipe 20 discharges the slag and waste liquid from the gas-liquid separator 13, while the discharge pipe 14 extracts the ammonia water collected by the gas-liquid separator 13.

[0029] Specifically, during operation, when the flue gas from the kiln tail flue chamber 3 enters the decomposition furnace 4, the distance between the tertiary air duct 6 and the pulverized coal burner 5 creates a reducing atmosphere zone inside the decomposition furnace 4, extending the nitrogen oxide reduction reaction time and rapidly reducing nitrogen oxides to nitrogen gas for the first treatment of the flue gas. The flue gas then flows into the treatment tank 7. The ammonia water pipe 8 supplies ammonia water to all the branch pipes 9 and nozzles 17. The nozzles 17 atomize the ammonia water, ensuring full contact with the flue gas. Then, the flue gas, atomized ammonia water, and gaseous ammonia water generated at high temperature enter the cooling tank through the transfer pipe 10. In the condenser 12, some ammonia water that forms droplets in the treatment tank 7 flows through the transfer pipe 10 to the recovery pipe 11. In the condenser 12, the gaseous ammonia water is reliquefied due to the low temperature and enters the recovery pipe 11 through the return pipe 15 in the condenser 12, where it can be recycled. The flue gas discharged from the condenser 12 to the gas-liquid separator 13, as well as the ammonia water droplets flowing with the flue gas, enter the gas-liquid separator 13, causing the ammonia water droplets to form large droplets and be collected in the gas-liquid separator 13, thus realizing the recycling of ammonia water and reducing the amount of ammonia water used.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-ammonia denitrification device, characterized in that, It includes a kiln tail smoke chamber (3), a decomposition furnace (4) is connected above the kiln tail smoke chamber (3), a processing tank (7) is connected to the decomposition furnace (4), an ammonia water pipe (8) is sleeved on the surface of the processing tank (7), and a connector (16) is provided on the ammonia water pipe (8), and the ammonia water pipe (8) is connected to the inside of the processing tank (7). The lower end of the processing tank (7) is connected to a transfer pipe (10), and the other end of the transfer pipe (10) is connected to a condenser (12). The upper part of the condenser (12) is connected to a gas-liquid separator (13). The lower surface of the transfer pipe (10) is connected to a recovery pipe (11). The lower part of the surface of the condenser (12) is connected to a return pipe (15), and the return pipe (15) is connected to the recovery pipe (11).

2. The low-ammonia denitrification device according to claim 1, characterized in that: The surface of the decomposition furnace (4) is connected to a pulverized coal burner (5) and a tertiary air duct (6) located above the pulverized coal burner (5).

3. The low-ammonia denitrification device according to claim 1, characterized in that: The lower surface of the kiln tail smoke chamber (3) is connected to a heat insulation shell (1), and the lower surface of the heat insulation shell (1) is connected to a slag discharge port (2).

4. The low-ammonia denitrification device according to claim 1, characterized in that: The ammonia water pipe (8) is connected to a branch pipe (9), which is inserted into the treatment tank (7) and connected to a nozzle (17).

5. A low-ammonia denitrification device according to claim 1, characterized in that: The condenser (12) has a spiral tube (18) inside, and the two ends of the spiral tube (18) are connected to adapters (19), and the adapters (19) pass through the condenser (12).

6. A low-ammonia denitrification device according to claim 1, characterized in that: The gas-liquid separator (13) is connected to a discharge pipe (14) and a sewage pipe (20).

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