An air-cooling system for PNCR denitrification nozzles in incinerators

Abstract

This utility model relates to the field of waste treatment technology, specifically an air-cooling system for a PNCR denitrification spray gun in an incinerator. This utility model uses external compressed air for cooling the PNCR denitrification agent spray gun. The compressed air first undergoes a three-stage air filter to remove water vapor before entering the air storage tank to settle water vapor and oil vapor. Through this combined process, the water and oil vapor present in the compressed air are further separated, improving the quality of the compressed air entering the PNCR denitrification agent spray gun. This effectively cools the spray gun nozzle and avoids the risk of adhesion and blockage of the nozzle after reaction with the denitrification agent. In addition, it provides the additional technical benefit of assisting the spray gun in blowing the denitrification agent.

Description

Technical Field

[0001] This utility model relates to the field of waste treatment technology, specifically an air-cooling system for PNCR denitrification spray guns in incinerators. Background Technology

[0002] PNCR (Polymer-based NO) x The denitrification spray gun (Reduction) is a key piece of equipment in selective non-catalytic reduction (SNR) denitrification technology. Its core function is to precisely and evenly spray reducing agents such as ammonia water and urea solution into the high-temperature flue gas zone of boilers, kilns, and incinerators, allowing the reducing agents to react with nitrogen oxides (NOx) in the flue gas. x A chemical reaction occurs, producing harmless nitrogen gas and water, thereby reducing NO levels. x emission.

[0003] In the field of waste incineration, a pneumatic conveying system is used to inject polymeric denitrification agents into the optimal temperature field of the blast furnace. At high temperatures, the chemical bonds connecting amino groups and polymers break, releasing a large number of amino-containing functional groups. These amino groups then react with NO in the flue gas. x A reaction occurs, thereby removing NO from the flue gas. x .

[0004] In the above denitrification process, because the spray gun for the polymeric denitrification agent is installed in the high-temperature zone of the furnace (approximately 850℃~1050℃), there is a problem of high-temperature carbonization at the spray gun nozzle. To address this issue in existing technologies, compressed air from the plant is typically introduced into the nozzle area for cooling. Although this compressed air has been dried using a refrigerated dryer, it still contains some moisture and oil vapor. However, in actual production, because the PNCR polymeric denitrification agent is a powdery material, it readily absorbs the small amount of moisture in the compressed air, forming clumps that easily clog the spray gun outlet, leading to nozzle blockage and preventing the spray gun from operating normally and stably.

[0005] Based on the above reasons, this utility model provides an air-cooling system for PNCR denitrification spray guns in incinerators. By using an efficient combination of an air-cooled blowing system and a pneumatic conveying system for denitrification agents, it solves both the problem of high-temperature cooling at the PNCR spray gun nozzle and the problem of nozzle adhesion and blockage, enabling the denitrification spray gun to work normally and thus ensuring that the emission of harmful substances from waste incineration can be controlled within a certain range. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an air-cooling system for PNCR denitrification spray guns in incinerators. By using an efficient combination of an air-cooled blowing system and a pneumatic conveying system for denitrification agents, the problem of high-temperature cooling of the PNCR spray gun nozzle and the problem of nozzle adhesion and blockage are solved, enabling the denitrification spray gun to work normally and thus ensuring that the emission of harmful substances from waste incineration can be controlled within a certain range.

[0007] To achieve the above objectives, this utility model provides an air-cooling system for a PNCR denitrification spray gun in an incinerator. The incinerator is directly connected to the PNCR denitrification agent spray gun, which is connected to a denitrification agent delivery device via a denitrification agent delivery pipe. The PNCR denitrification agent spray gun is connected to a manual shut-off valve via a compressed air pipe, and then to a gas storage tank via a compressed air pipe. The gas storage tank is connected to a manual shut-off valve via a drain pipe, and then to a drain pipe. The gas storage tank is connected to an air triplet via a compressed air pipe, and the air triplet is connected to a compressed air main pipe via a compressed air pipe.

[0008] Compared with existing technologies, this utility model addresses the problems encountered in practical applications by having the compressed air used to cool the PNCR denitrification agent spray gun undergo a first-stage filtration process using an air triplet before entering the air storage tank to settle water vapor and oil vapor. Through this combined process, the water and oil vapor present in the compressed air are further separated, improving the quality of the compressed air entering the PNCR denitrification agent spray gun. This effectively cools the spray gun nozzle and avoids the risk of adhesion and blockage of the spray gun nozzle after reacting with the denitrification agent. In addition, it also provides the additional technical function of assisting the spray gun in blowing the denitrification agent. Attached Figure Description

[0009] Figure 1 This is a schematic diagram showing the connection relationship between the various components and pipelines of this utility model.

[0010] Explanation of reference numerals in the attached figures:

[0011] 1. Incinerator; 2. PNCR denitrification agent spray gun; 3. Denitrification agent delivery pipe; 4. Denitrification agent delivery device; 5. Compressed air pipe 1; 6. Manual shut-off valve 1; 7. Compressed air pipe 2; 8. Gas storage tank; 9. Drain pipe 1; 10. Manual shut-off valve 2; 11. Drain pipe 2; 12. Compressed air pipe 3; 13. Air triplet; 14. Compressed air pipe 4; 15. Compressed air main pipe. Detailed Implementation

[0012] The present invention will now be further described with reference to the accompanying drawings.

[0013] See Figure 1This utility model provides an air-cooling system for a PNCR denitrification spray gun in an incinerator. The incinerator 1 is directly connected to the PNCR denitrification agent spray gun 2. The PNCR denitrification agent spray gun 2 is connected to the denitrification agent delivery device 4 through the denitrification agent delivery pipe 3. The PNCR denitrification agent spray gun 2 is connected to the manual shut-off valve 6 through the compressed air pipe 1 5, and then to the gas storage tank 8 through the compressed air pipe 2 7. The gas storage tank 8 is connected to the manual shut-off valve 2 10 through the drain pipe 1 9, and then to the drain pipe 2 11. The gas storage tank 8 is connected to the air triplet 13 through the compressed air pipe 3 12, and the air triplet 13 is connected to the compressed air main pipe 15 through the compressed air pipe 4 14.

[0014] Working principle:

[0015] See Figure 1 This invention requires minimal debugging. When the denitrification agent delivery device 4 needs to inject denitrification agent into the incinerator 1 through the PNCR denitrification agent spray gun 2, the manual shut-off valve 6 is first opened. Air from the compressed air header 15 enters the air triplet 13 for water vapor filtration. The air from the air triplet 13 then enters the gas storage tank 8. Due to the reduced flow rate, water and oil droplets are separated again. The air from the gas storage tank 8 enters the PNCR denitrification agent spray gun 2 through the manual shut-off valve 6, protecting the PNCR denitrification agent spray gun 2 from being burned by the high-temperature flue gas in the incinerator 1. In addition, the water and oil droplets separated by the reduced flow rate in the gas storage tank 8 settle to the bottom of the tank under gravity. The manual shut-off valve 10 is then opened, and the separated water and oil droplets are discharged from the gas storage tank 8 through the drain pipe 9 and the drain pipe 11.

[0016] The above are merely preferred embodiments of this utility model, intended only to aid in understanding the method and core concept of this application. The scope of protection of this utility model is not limited to the above embodiments; all technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the scope of protection of this utility model.

[0017] This invention comprehensively addresses the problem in existing technologies where moisture and oil in the air used to cool the denitrification agent spray gun can adhere to the denitrification agent, thus affecting the normal operation of the spray gun. By first filtering the external compressed air through an air triplet before it enters the air tank, it achieves high-temperature cooling of the spray gun nozzle and further filters out water, oil, and gas in the compressed air, ensuring that the nozzle does not stick. It also promotes the blowing of the denitrification agent through the nozzle. Through simple system improvements, this invention effectively solves the problems encountered in practical use, ensures the denitrification process at the incineration rate, and provides a certain guarantee for the environmental protection and safety of the waste treatment process.

Claims

1. An air-cooling system for PNCR denitrification spray nozzles in incinerators, characterized in that, The incinerator (1) is directly connected to the PNCR denitrification agent spray gun (2), which is connected to the denitrification agent delivery device (4) through the denitrification agent delivery pipe (3); the PNCR denitrification agent spray gun (2) is connected to the manual shut-off valve (6) through the compressed air pipe (5), and then connected to the gas storage tank (8) through the compressed air pipe (7); the gas storage tank (8) is connected to the manual shut-off valve (10) through the drain pipe (9), and then connected to the drain pipe (11); the gas storage tank (8) is connected to the air triplet (13) through the compressed air pipe (3) (12), and the air triplet (13) is connected to the compressed air main pipe (15) through the compressed air pipe (4) (14).

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