Denitration protection structure of hazardous waste heat recovery boiler

Abstract

The utility model relates to the technical field of waste heat boiler, and disclose dangerous and useless waste heat boiler denitration protection structure, including base and setting the boiler body at the upper end of base, the upper end of boiler body is provided with flue, one side of boiler body is provided with denitration structure, and the pump body is started, and the urea solution can be pumped out by utilizing pipeline, and can be reduced nitrogen oxides in flue gas by utilizing the spray gun to spray, realize the purpose of denitration, and can carry out anticorrosion protection by the aid of Y type round steel grab nail and refractory castable, and the water wall structure can be used normally, avoid the boiler body and stop the boiler because of water wall structure corrosion, can guarantee burning and flue gas denitration system normal operation while can reduce waste heat boiler part heat exchange, improve the boiler body export flue gas temperature, satisfy environmental protection requirement, utilize the heat preservation structure to the urea storage tank of storage urea solution heat preservation, avoid the crystallization of too low temperature, do not influence the reduction use of nitrogen oxides in the boiler body inside.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, specifically to a denitrification protection structure for hazardous waste heat boilers. Background Technology

[0002] A waste heat boiler is a device that heats water and produces steam or hot water by recovering waste gas or waste heat from industrial processes. It utilizes existing energy sources, improves energy efficiency, and reduces emissions. Waste heat boilers are typically used to recover waste heat from industrial production processes, which may originate from combustion processes, chemical reactions, metal smelting, etc.

[0003] The existing waste heat boiler uses selective non-catalytic reduction (SNCR) denitrification technology, which involves directly injecting urea solution atomized with compressed air into the furnace at a temperature of 850℃~1100℃ using a dual-fluid spray gun to reduce NOx in the flue gas. However, due to the large atomization range of the urea spray gun, the urea solution is easily splashed onto the boiler water-cooled wall in front of the spray gun. The urea solution and the ammonia produced by urea hydrolysis are highly corrosive and can easily corrode and perforate the water-cooled wall, leading to system shutdown.

[0004] Therefore, we proposed a denitrification protection structure for hazardous waste heat boilers to address the aforementioned issues. Utility Model Content

[0005] The purpose of this utility model is to provide a denitrification protection structure for hazardous waste heat boilers, in order to solve the problem mentioned in the background art that, due to the large atomization range of the urea spray gun, urea solution is easily splashed onto the boiler water-cooled wall in front of the spray gun. Urea solution and ammonia from urea hydrolysis are highly corrosive and can easily corrode and perforate the water-cooled wall, leading to system shutdown.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a denitrification protection structure for a hazardous waste heat boiler, including a base and a boiler body disposed on the upper end of the base. A flue for exhausting flue gas is disposed on the upper end of the boiler body. A denitrification structure is disposed on one side of the boiler body. The denitrification structure is used to spray uric acid solution into the boiler body. Selective non-catalytic reduction can remove nitrogen oxides in the waste gas, thereby achieving the purpose of denitrification.

[0007] The boiler body is equipped with a water-cooled wall structure, which includes an installation plate on the inner wall of the boiler body and water-cooled pipes that are vertically and evenly distributed on one side of the installation plate. A clamp is installed on one side of the installation plate, and a refractory castable is laid on one side of the clamp. The clamp has a Y-shaped structure. The refractory castable can play a role in corrosion resistance and can protect the water-cooled wall structure.

[0008] Preferably, the water-cooled wall structure is installed around the furnace of the boiler body, and the water-cooled wall structure plays the role of heat dissipation, heat transfer and protection of the boiler body furnace from high temperature damage.

[0009] Preferably, a side support plate is provided on one side of the base, and support legs for support are provided on the outer sides of both the base and the side support plate. The side support plate is used to support the denitrification structure.

[0010] Preferably, the denitrification structure includes a uric acid storage tank disposed on the upper end of the side support plate and an inlet pipe disposed on the upper end of the uric acid storage tank. The uric acid storage tank is used to store uric acid solution. A spiral cap is threaded onto the opening of the inlet pipe. An insulation structure is disposed on the outside of the uric acid storage tank to keep it warm. A pump body is disposed inside the uric acid storage tank. One end of the pump body is connected to a spray gun through a pipe. When the pump body is started, the uric acid solution can be drawn out through the pipe and sprayed out through the spray gun to reduce nitrogen oxides in the flue gas.

[0011] Preferably, the insulation structure includes an insulation cover disposed on the outside of the uric acid storage tank. The insulation cover is provided in two sets. One set of the insulation cover has positioning blocks installed at both ends, and the other set of the insulation cover has positioning grooves opened at both ends. The positioning blocks and positioning grooves are compatible and can be fixed by bolts. An insulation layer for insulation is provided on the inner wall of the insulation cover.

[0012] Preferably, the stirring component includes a motor mounted on the upper end of the uric acid storage tank via a motor mount and a rotating shaft connected to the output end of the motor. Several stirring rods are evenly distributed on the outer side of the rotating shaft. When the motor is started, the rotating shaft and stirring rods can be driven to rotate, which can slowly stir the uric acid solution.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By using the set base, boiler body, flue and denitrification structure, uric acid solution is sprayed in by spray gun. Selective non-catalytic reduction can remove nitrogen oxides in the exhaust gas to achieve the purpose of denitrification. Y-shaped round steel grab nails are used to place the refractory castable on one side of the water-cooled wall structure, thereby protecting the water-cooled wall structure and preventing it from being corroded and causing boiler shutdown.

[0015] 2. By using the set insulation structure and stirring components, the uric acid storage tank storing the uric acid solution is kept warm by the insulation structure to avoid crystallization due to excessively low temperature. The uric acid solution can also be slowly stirred to prevent precipitation and to ensure that the reduction of nitrogen oxides inside the boiler body is not affected. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the boiler body of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the denitrification structure of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the stirring component of this utility model.

[0020] In the diagram: 1. Base; 11. Side support plate; 12. Support leg; 2. Boiler body; 21. Water-cooled wall structure; 211. Mounting plate; 212. Water-cooled pipe; 22. Cling nail; 23. Refractory castable; 3. Flue; 4. Denitrification structure; 41. Uric acid storage tank; 42. Liquid inlet pipe; 43. Spiral cap; 44. Insulation structure; 441. Insulation cover; 442. Positioning block; 443. Positioning groove; 444. Insulation layer; 45. Agitator; 451. Motor; 452. Rotating shaft; 453. Agitator rod; 46. Pump body; 47. Spray gun. Detailed Implementation

[0021] 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.

[0022] Example 1: Please refer to Figures 1-3 The denitrification protection structure for hazardous waste heat boiler includes a base 1 and a boiler body 2 set on the upper end of the base 1. A flue 3 for exhausting flue gas is set on the upper end of the boiler body 2. A denitrification structure 4 is set on one side of the boiler body 2. The denitrification structure 4 is used to spray uric acid solution into the boiler body 2. By using selective non-catalytic reduction, nitrogen oxides in the waste gas can be removed, thereby achieving the purpose of denitrification.

[0023] The boiler body 2 is equipped with a water-cooled wall structure 21. The water-cooled wall structure 21 includes an installation plate 211 installed on the inner wall of the boiler body 2 and water-cooled pipes 212 that are vertically and evenly distributed on one side of the installation plate 211. A clamp 22 is installed on one side of the installation plate 211, and a refractory castable 23 is laid on one side of the clamp 22. The clamp 22 has a Y-shaped structure. The refractory castable 23 can play a role in corrosion resistance and can protect the water-cooled wall structure 21 to prevent corrosion.

[0024] The water-cooled wall structure 21 is installed around the furnace of the boiler body 2. The water-cooled wall structure 21 plays the role of heat dissipation, heat transfer and protection of the furnace of the boiler body 2 from high temperature damage.

[0025] A side support plate 11 is provided on one side of the base 1, and support legs 12 for support are provided on the outer sides of both the base 1 and the side support plate 11. The side support plate 11 is used to support the denitrification structure 4.

[0026] The denitrification structure 4 includes a uric acid storage tank 41 located on the upper end of the side support plate 11 and an inlet pipe 42 located on the upper end of the uric acid storage tank 41. The uric acid storage tank 41 is used to store uric acid solution. A spiral cap 43 is threaded onto the opening of the inlet pipe 42. An insulation structure 44 is provided on the outside of the uric acid storage tank 41 to keep it warm. A pump body 46 is installed inside the uric acid storage tank 41. One end of the pump body 46 is connected to a spray gun 47 through a pipe. When the pump body 46 is started, the uric acid solution can be drawn out through the pipe and sprayed out through the spray gun 47 to reduce nitrogen oxides in the flue gas and achieve the purpose of denitrification.

[0027] In this embodiment: When in use, the pump body 46 is started, and the uric acid solution can be extracted through the pipeline and sprayed out through the spray gun 47. This can reduce nitrogen oxides in the flue gas, achieve the purpose of denitrification, and provide anti-corrosion protection with the help of Y-shaped round steel nails 22 and refractory castable 23. The water-cooled wall structure 21 can be used normally, avoiding boiler shutdown due to corrosion of the water-cooled wall structure 21. This can ensure the normal operation of the combustion and flue gas denitrification system while reducing heat exchange in the waste heat boiler, increasing the outlet flue gas temperature of the boiler body 2, and meeting environmental protection requirements.

[0028] Example 2: This example is an improvement on Example 1. For details, please refer to [link / reference]. Figure 3 and Figure 4 The insulation structure 44 includes an insulation cover 441 disposed on the outside of the uric acid storage tank 41. The insulation cover 441 is provided in two sets. One set of the insulation cover 441 has positioning blocks 442 installed at both ends, and the other set of the insulation cover 441 has positioning grooves 443 opened at both ends. The positioning blocks 442 and the positioning grooves 443 are compatible and can be fixed by bolts. An insulation layer 444 for heat preservation is provided on the inner wall of the insulation cover 441.

[0029] The stirring component 45 includes a motor 451 mounted on the upper end of the uric acid storage tank 41 via a motor mount and a rotating shaft 452 connected to the output end of the motor 451. Several stirring rods 453 are evenly distributed on the outer side of the rotating shaft 452. When the motor 451 is started, it can drive the rotating shaft 452 and the stirring rods 453 to rotate, which can slowly stir the uric acid solution and prevent the urea solution from precipitating.

[0030] In this embodiment: the two sets of heat insulation covers 441 are brought close to each other, and the positioning block 442 is inserted into the positioning groove 443 to position the two sets of heat insulation covers 441. Then, they are fixed with bolts so that the two sets of heat insulation covers 441 are fixed to the outside of the uric acid storage tank 41. The heat insulation covers 441 and the heat insulation layer 444 can play a role in heat preservation and prevent solution crystallization. At the same time, the motor 451 is started, which can drive the rotating shaft 452 and the stirring rod 453 to rotate, which can slowly stir the uric acid solution and prevent the urea solution from precipitating, which would affect subsequent spraying.

[0031] Working principle: When the pump body 46 is started, the uric acid solution can be drawn out through the pipeline and sprayed out through the spray gun 47 to reduce nitrogen oxides in the flue gas and achieve the purpose of denitrification. The Y-shaped round steel grab nails 22 and refractory castable 23 can provide anti-corrosion protection. The water-cooled wall structure 21 can be used normally. The two sets of heat insulation covers 441 are brought close to each other, and the positioning block 442 is inserted into the positioning groove 443 to position the two sets of heat insulation covers 441. Then, they are fixed with bolts so that the two sets of heat insulation covers 441 are fixed on the outside of the uric acid storage tank 41. The heat insulation covers 441 and the heat insulation layer 444 can play a heat preservation role. At the same time, the motor 451 is started, which can drive the rotating shaft 452 and the stirring rod 453 to rotate, which can slowly stir the uric acid solution.

[0032] It should be noted that the working principle of the water-cooled wall structure 21 is to absorb heat in the combustion chamber by evaporating water. This is not an innovative part of this application and is common knowledge. Those skilled in the art are capable of conceiving of the specific structure and layout.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A denitrification protection structure for a hazardous waste heat boiler, comprising a base (1) and a boiler body (2) disposed on the upper end of the base (1), wherein a flue (3) for exhausting flue gas is provided on the upper end of the boiler body (2), characterized in that: A denitrification structure (4) is provided on one side of the boiler body (2), and the denitrification structure (4) is used to spray uric acid solution into the boiler body (2); The boiler body (2) is provided with a water-cooled wall structure (21). The water-cooled wall structure (21) includes an installation plate (211) on the inner wall of the boiler body (2) and water-cooled pipes (212) that are vertically and evenly distributed on one side of the installation plate (211). A grab nail (22) is installed on one side of the installation plate (211). A refractory castable (23) is laid on one side of the grab nail (22). The grab nail (22) has a Y-shaped structure. The refractory castable (23) can play a role in corrosion resistance.

2. The denitrification protection structure for hazardous waste heat boilers according to claim 1, characterized in that: The water-cooled wall structure (21) is installed around the furnace of the boiler body (2). The water-cooled wall structure (21) plays the role of heat dissipation, heat transfer and protection of the furnace of the boiler body (2) from high temperature damage.

3. The denitrification protection structure for hazardous waste heat boilers according to claim 2, characterized in that: A side support plate (11) is provided on one side of the base (1), and support legs (12) for support are provided on the outer sides of both the base (1) and the side support plate (11).

4. The denitrification protection structure for hazardous waste heat boilers according to claim 3, characterized in that: The denitrification structure (4) includes a uric acid storage tank (41) located on the upper end of the side support plate (11) and an inlet pipe (42) located on the upper end of the uric acid storage tank (41). The uric acid storage tank (41) is used to store uric acid solution. A spiral cap (43) is threaded onto the opening of the inlet pipe (42). An insulation structure (44) is provided on the outside of the uric acid storage tank (41). The insulation structure (44) serves to keep the temperature warm. A pump body (46) is provided inside the uric acid storage tank (41). One end of the pump body (46) is connected to a spray gun (47) through a pipe.

5. The denitrification protection structure for hazardous waste heat boilers according to claim 4, characterized in that: The insulation structure (44) includes an insulation cover (441) disposed on the outside of the uric acid storage tank (41). There are two sets of insulation covers (441). One set of insulation covers (441) has positioning blocks (442) installed at both ends, and the other set of insulation covers (441) has positioning grooves (443) opened at both ends. An insulation layer (444) for heat preservation is disposed on the inner wall of the insulation cover (441).

6. The denitrification protection structure for hazardous waste heat boilers according to claim 5, characterized in that: The stirring component (45) includes a motor (451) mounted on the upper end of the uric acid storage tank (41) via a motor mount and a rotating shaft (452) connected to the output end of the motor (451). Several stirring rods (453) are evenly distributed on the outer side of the rotating shaft (452).

Images