Urea spray gun of denitration pyrolyzing furnace

Abstract

The utility model discloses a urea spray gun of a denitration pyrolyzing furnace, which belongs to the technical field of denitration devices and solves the problem that the existing spray gun cannot be effectively disassembled in a short time. One end of a gun barrel is connected with a spray nozzle, and the other end of the gun barrel is provided with a mounting flange sleeve which is communicated with a fixed flange sleeve; the fixed flange sleeve is provided with a sealing cooling port, the sealing cooling port is connected with a sealing cooling compression pipeline, one side of the fixed flange sleeve is communicated with a gas-liquid mixing pipe, the gas-liquid mixing pipe is provided with a gas inlet and a liquid inlet, the gas inlet is connected with a compressed air pipeline, and the liquid inlet is connected with a liquid inlet pipeline. The flue gas overflow in the pyrolyzing furnace is sealed and isolated by using the pressure of cooling compressed air, so that the risk that operators are scalded and poisoned due to the overflow and splashing of the high-temperature flue gas is effectively reduced, the operation of a denitration facility does not need to be quitted when a spray gun is replaced, the operation requirement of an environment-friendly facility is met, and the operating efficiency is improved. And the operation efficiency is improved, and the maintenance time and frequency are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of denitration devices, and particularly relates to a urea spray gun for a denitration pyrolysis furnace. Background Art

[0002] During the operation of the boiler denitration system, the urea spray gun of the pyrolysis furnace needs to be regularly inspected and tested for its atomization performance to avoid the blockage of the pyrolysis furnace caused by the crystallization of urea solution due to poor atomization effect of the spray gun during the operation of the boiler, which may lead to the forced shutdown of the unit due to the non-compliance of the nitrogen oxide emissions in the boiler flue gas. Therefore, during the operation, according to the boiler operation instruction manual, the spray gun of the denitration system pyrolysis furnace needs to be regularly inspected and tested. However, in the actual operation process, in order to meet the requirements of the operation of environmental protection facilities and the up-to-standard discharge of pollutants, it is impossible to withdraw the denitration system during the operation of the boiler, that is, the spray gun needs to be withdrawn within the shortest time to complete the inspection and test.

[0003] However, due to the current structure of the spray gun, it cannot be effectively disassembled in a short time, so there are the following problems: 1. When the spray gun is withdrawn for inspection and test, the operation space is narrow, and there are risks of scalding and poisoning by high-temperature gas; 2. The operation of withdrawing the spray gun is difficult, the loading and unloading time is long, and it is extremely easy to cause the exceedance of nitrogen oxides, affecting the stable and up-to-standard operation of the denitration environmental protection system; 3. The disassembly time cannot be effectively controlled within a short time, affecting the inspection, test and production operation. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a urea spray gun for a denitration pyrolysis furnace to solve the problem that the current spray gun cannot be effectively disassembled in a short time.

[0005] The technical solution of the utility model is: a urea spray gun for a denitration pyrolysis furnace, the spray gun includes a gun rod and a nozzle, one end of the gun rod is connected to the nozzle, the other end of the gun rod is provided with an installation flange sleeve, the installation flange sleeve is communicated with a fixed flange sleeve, the fixed flange sleeve is provided with a sealed cooling port, a sealed cooling compression pipeline is connected to the sealed cooling port, one side of the fixed flange sleeve is communicated with a gas-liquid mixing pipe, the gas-liquid mixing pipe is provided with an air inlet and a liquid inlet, a compressed air pipeline is connected to the air inlet, and a liquid inlet pipeline is connected to the liquid inlet.

[0006] As a further improvement of the utility model, high-temperature resistant valves are respectively arranged on the sealed cooling compression pipeline, the compressed air pipeline and the liquid inlet pipeline.

[0007] As a further improvement of the utility model, a quick connector is arranged on the liquid inlet.

[0008] As a further improvement of the utility model, the nozzle is a special alloy nozzle.

[0009] The beneficial effects of the present utility model are as follows: When it is necessary to disassemble the spray gun, compressed air is introduced through the sealed cooling compression pipeline, and the compressed air pipeline and the liquid inlet pipeline are shut down. Since the pressure of the compressed air is higher than the pressure of the flue gas in the pyrolysis furnace, it plays an automatic sealing and isolation and cooling role, and can form a low-temperature sealing air flow at the inlet, effectively blocking the overflow of high-temperature gas and ammonia in the pyrolysis furnace. At this time, the spray gun can be quickly removed from the pyrolysis furnace within a short time, thus avoiding the harm caused by the ejection of positive-pressure high-temperature flue gas in the pyrolysis furnace to the operators.

[0010] Aiming at the defect that the existing urea solution spray gun cannot be effectively withdrawn for inspection and test during operation, resulting in the risks of urea solution splashing, scalding by high-temperature flue gas, and poisoning, the present utility model designs a new denitration pyrolysis furnace urea spray gun, solves the above-mentioned defects, and realizes the online inspection, test or replacement of the urea solution spray gun that can be effectively disassembled within a short time.

[0011] The present utility model uses the pressure of compressed air to seal and isolate the overflow of flue gas in the pyrolysis furnace, effectively reducing the risks of scalding and poisoning of operators caused by the overflow and splashing of high-temperature flue gas, realizing that when conducting online inspection, atomization test or maintenance and replacement of the spray gun, it is not necessary to withdraw the operation of the denitration facility, meeting the requirements of the operation of environmental protection facilities, effectively avoiding the problem that the urea solution in the denitration pyrolysis furnace is close to being blocked, improving the operation efficiency and reducing the maintenance time and frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0013] In the figure: 1 - gun rod; 11 - nozzle; 2 - installation flange sleeve; 3 - fixed flange sleeve; 31 - sealed cooling port; 4 - gas-liquid mixing pipe; 5 - air inlet; 6 - liquid inlet; 61 - quick connector; 7 - sealed cooling compression pipeline; 8 - compressed air pipeline; 9 - liquid inlet pipeline; 10 - high-temperature resistant valve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] As Figure 1 shown, a denitration pyrolysis furnace urea spray gun, the spray gun includes a gun rod 1 and a nozzle 11, one end of the gun rod 1 is connected to the nozzle 11, the other end of the gun rod 1 is provided with an installation flange sleeve 2, the installation flange sleeve 2 is communicated with a fixed flange sleeve 3, the fixed flange sleeve 3 is provided with a sealed cooling port 31, the sealed cooling port 31 is connected with a sealed cooling compression pipeline 7, one side of the fixed flange sleeve 3 is communicated with a gas-liquid mixing pipe 4, the gas-liquid mixing pipe 4 is provided with an air inlet 5 and a liquid inlet 6, the air inlet 5 is connected with a compressed air pipeline 8, and the liquid inlet 6 is connected with a liquid inlet pipeline 9.

[0016] High-temperature resistant valves 10 are respectively provided on the sealed cooling compression pipeline 7, the compressed air pipeline 8 and the liquid inlet pipeline 9; a quick connector 61 is provided at the liquid inlet 6; the nozzle 11 is a special alloy nozzle.

[0017] Installing high-temperature resistant valves 10 on the sealed cooling compression pipeline 7, the compressed air pipeline 8 and the liquid inlet pipeline 9 respectively facilitates adjustment and control; the liquid inlet 6 is bent and provided at the end of the gas-liquid mixing pipe 4, which can reduce the impact of the solution entering and play a certain buffering role; a quick connector 61 is provided at the liquid inlet 6 to connect the pipelines in a quick connection manner, which is convenient for disassembly and assembly and improves the efficiency of installation and disassembly; the nozzle 11 uses a special alloy nozzle, which is wear-resistant and durable and has a good spraying effect.

[0018] The sealed cooling port 31 is connected to the sealed cooling compression pipeline 7 and is closed during normal operation. When it is necessary to conduct regular on-line inspections, tests or maintenance and replacement of the spray gun, first open the sealed cooling compression pipeline 7 to introduce cooling compressed air, and close the high-temperature resistant valves 10 on the compressed air pipeline 8 and the liquid inlet pipeline 9 to prevent compressed air and the solution from entering the air inlet 5 and the liquid inlet 6. Since the pressure of the cooling compressed air is between 0.5 - 0.7 MPa and the pressure in the pyrolysis furnace is between 0.2 - 0.3 MPa, that is, because the pressure of the cooling compressed air is higher than the flue gas pressure in the pyrolysis furnace, it plays an automatic sealing and isolation and cooling role, and can form a low-temperature sealing air at the inlet, effectively blocking the overflow of high-temperature gas and ammonia in the pyrolysis furnace. At this time, the gun barrel 1 and the installation flange sleeve 2 can be quickly removed from the fixed flange sleeve 3, and then the spray gun can be removed from the pyrolysis furnace, thus avoiding the harm caused by the ejection of the positive-pressure high-temperature flue gas in the pyrolysis furnace to the operators.

[0019] The utility model has a simple structure and is convenient to operate, reducing the labor intensity of the operators; it is simple to manufacture, the material price is low and easy to obtain, reducing the production cost; the operation efficiency is high, realizing regular inspections, atomization tests or maintenance and replacement of the spray gun on-line without withdrawing the environmental protection facilities, improving the operation stability of the denitration environmental protection facilities; reducing the original time for regular inspections and atomization tests from 1 hour to the current 15 minutes, shortening the inspection time and having a good use effect.

Claims

1. A urea spray gun for a denitrification pyrolysis furnace, the spray gun comprising a gun rod and a nozzle, characterized in that: One end of the gun rod (1) is connected to the nozzle (11), and the other end of the gun rod (1) is provided with a mounting flange sleeve (2), the mounting flange sleeve (2) is connected to a fixed flange sleeve (3), a sealed cooling port (31) is provided on the fixed flange sleeve (3), the sealed cooling port (31) is connected to a sealed cooling compression pipeline (7), one side of the fixed flange sleeve (3) is connected to a gas-liquid mixing pipe (4), the gas-liquid mixing pipe (4) is provided with an air inlet (5) and a liquid inlet (6), the air inlet (5) is connected to a compressed air pipeline (8), and the liquid inlet (6) is connected to a liquid inlet pipeline (9).

2. A denitration pyrolysis furnace urea spray gun according to claim 1, characterized in that: The sealed cooling compression pipeline (7), the compressed air pipeline (8) and the liquid inlet pipeline (9) are respectively provided with high temperature resistant valves (10).

3. A denitration pyrolysis furnace urea spray gun according to claim 2, characterized in that: The liquid inlet (6) is provided with a quick connector (61).

4. The urea spray gun for a denitration pyrolysis furnace according to claim 1, characterized in that: The nozzle (11) is a special alloy nozzle.

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