A natural gas heating furnace heat recovery SCR denitrification device and denitrification method

Abstract

The present invention provides a natural gas heating furnace reheat SCR denitration device and denitration method, which relates to the technical field of SCR denitration, and comprises a furnace body and a denitration box, wherein a flue gas outlet is provided on one side of the furnace body, a flue gas inlet is provided on one side of the denitration box, a smoke exhaust port is provided on the side of the denitration box away from the flue gas outlet, a smoke delivery pipe is fixedly connected to the side of the flue gas inlet close to the furnace body, the smoke delivery pipe is composed of a straight pipe and a curved pipe connected, a bracket is fixedly connected to the lower surface of the denitration box, a spray structure is arranged on the side of the curved pipe close to the flue gas outlet, the spray structure comprises a cooling component, a spray component and a supercharging component, the cooling component comprises a heat dissipation water tank, the heat dissipation water tank is fixedly connected to the side of the smoke delivery pipe close to the furnace body, and a water pump is installed on the upper surface of the heat dissipation water tank. The present invention solves the disadvantage in the prior art that the existing medium-temperature SCR catalyst is not suitable for the flue gas denitration treatment of the internal combustion engine power generation group.

Description

Technical Field

[0001] The present invention relates to the technical field of SCR denitration, and in particular to a natural gas heating furnace heat recovery SCR denitration device and a denitration method. Background Art

[0002] The natural gas heating furnace adopts a heat storage combustion method and a flue gas waste heat recovery system, which can preheat the combustion air. It has a high heat recovery efficiency and can save energy. At the same time, due to the reduction in natural gas consumption, the amount of flue gas generated is reduced, reducing environmental pollution. However, its flue gas far exceeds the emission requirements of atmospheric pollutants. Therefore, denitrification treatment is required before the flue gas is discharged.

[0003] Selective catalytic reduction (SCR) is now the mainstream technology for denitrification in China. Liquid ammonia is sprayed into the flue gas to react with NOx under the action of a catalyst to generate non-toxic, non-polluting nitrogen and water, thereby achieving the removal of nitrogen oxides. The activity of the catalyst is a key factor affecting the denitrification efficiency. However, the activity of the catalyst is related to the temperature of the flue gas. Specifically, the temperature window of the medium-temperature SCR catalyst is 300℃~400℃, while the temperature of the flue gas discharged from an internal combustion engine is usually 400℃-450℃. When a medium-temperature SCR catalyst is used to denitrify the flue gas discharged from an internal combustion engine, not only is the activity of the catalyst low, resulting in low denitrification efficiency, but the life of the catalyst is also greatly shortened. That is, the medium-temperature SCR catalyst is not suitable for the denitrification of flue gas generated by an internal combustion engine. A high-temperature SCR catalyst with a temperature window of 350℃~450℃ is usually used for denitrification. However, the price of the high-temperature SCR catalyst is high, which undoubtedly increases the cost of denitrification.

[0004] Therefore, it is necessary to provide a natural gas heating furnace reheat SCR denitrification device and a denitrification method to overcome the defect that the existing medium-temperature SCR catalyst is not suitable for denitrification treatment of flue gas from a natural gas heating furnace and reduce the denitrification cost. Summary of the invention

[0005] The purpose of the present invention is to solve the disadvantage in the prior art that the existing medium-temperature SCR catalyst is not suitable for flue gas denitration treatment of internal combustion engine power generation groups, and to propose a natural gas heating furnace heat recovery SCR denitration device and denitration method.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it includes a furnace body and a denitrification box, a flue gas outlet is provided on one side of the furnace body, a flue gas inlet is provided on one side of the denitrification box, a smoke exhaust port is provided on the side of the denitrification box away from the flue gas outlet, a smoke conveying pipe is fixedly connected to the side of the flue gas inlet close to the furnace body, the smoke conveying pipe is composed of a straight pipe and a curved pipe, a bracket is fixedly connected to the lower surface of the denitrification box, a spray structure is arranged on the side of the curved pipe close to the flue gas outlet, and the spray structure includes a cooling component, a spray component and a pressurizing component.

[0007] By adopting the above technical solution, the flue gas in the smoke conveying pipe can be cooled to a corresponding degree according to the flue gas temperature by setting a spray structure, thereby overcoming the defect that the existing medium-temperature SCR catalyst is not suitable for flue gas denitrification treatment of natural gas heating furnaces.

[0008] Preferably, the cooling component comprises a heat dissipation water tank, the heat dissipation water tank is fixedly connected to a side of the smoke conveying pipe close to the furnace body, a water pump is installed on the upper surface of the heat dissipation water tank, a water inlet is opened on the upper surface of the heat dissipation water tank, a sealing cover is threadedly connected to the upper surface of the water inlet, a straight water conveying pipe is connected and fixed to the lower surface of the heat dissipation water tank, an end of the straight water conveying pipe away from the heat dissipation water tank is connected and fixed to a water conveying elbow, an automatic solenoid valve is installed on the arc surface of the water conveying elbow, an end of the smoke conveying pipe close to the furnace body is fixedly connected to an assembly pipe, an auxiliary pipe is fixedly connected to the upper surface of the assembly pipe, and an end of the auxiliary pipe away from the assembly pipe is connected and fixed to the water conveying elbow, the spray component comprises a pressurized inner pipe, the arc surface of the pressurized inner pipe is fixedly connected to the inner wall of the auxiliary pipe, the inner diameter of the pressurized inner pipe gradually decreases from top to bottom and the upper end is a flared end, the lower surface of the pressurized inner pipe is fixedly connected to two rotating frames, and the inner wall of the rotating frame is fixedly connected The cam is connected with the upper and lower surfaces of the cam, and the cam is connected with the lower surface of the cam, and the cam is connected with the lower surface of the cam, and the cam is connected with the lower surface of the cam, and the cam is connected with the lower surface of the cam.

[0009] By adopting this preferred solution, the distance between the upper boost plate and the lower boost plate can be adjusted by means of the L-shaped rod and the sliding frame, and the distance between the upper boost plate and the lower boost plate can be kept very close by means of the spring, so that the cold water will be squeezed and diffused during the spraying process.

[0010] Preferably, the arc surface of the spring is sleeved with a bellows, the bellows is fixedly connected to one end of the L-shaped rod close to the spring, and one end of the bellows away from the L-shaped rod is fixedly connected to the sliding frame.

[0011] By adopting this preferred solution, the bellows can protect the spring from rusting due to contact with cold water, thereby affecting normal use.

[0012] Preferably, two baffles are fixedly connected to the inner wall of the assembly tube, and the sides of the two baffles close to each other are inclined surfaces.

[0013] By adopting this preferred solution, the two baffles can limit the downward rotation distance of the rotating plate, preventing excessive rotation and loss of the supercharging effect.

[0014] Preferably, a sealing plug is fixedly connected to one side of the rotating plate close to the boost inner tube, and the sealing plug is interference-connected with the inner wall of the boost inner tube.

[0015] By adopting this preferred solution, the sealing plug can increase the sealing effect of the rotating plate on the lower part of the pressurized inner tube, making it more difficult for cold water to push the rotating plate, thereby increasing the subsequent water pressure.

[0016] Preferably, two abutment pads are fixedly connected to one side of the rotating plate close to the boost inner tube, the two abutment pads abut against the lower surface of the boost inner tube, and the abutment pads are rubber pads.

[0017] By adopting this preferred solution, the abutment pad can prevent the rotating plate from being damaged by colliding with the booster inner tube when it is driven to reset by the torsional force of the spring after the water flow stops.

[0018] Preferably, a side of the lower supercharging plate close to the upper supercharging plate is provided with a plurality of guide grooves, and a side of the upper supercharging plate close to the lower supercharging plate is provided with a plurality of auxiliary grooves.

[0019] By adopting this preferred solution, the guide groove can still run water spraying when the upper boost plate and the lower boost pipe are fully fitted, preventing the lower extrusion plate from being squeezed downward due to the inability to form pressure in the right direction due to full fit.

[0020] Preferably, the auxiliary structure includes an auxiliary component, and the auxiliary component includes two shunt pipes, the two shunt pipes are respectively connected and fixed to the lower surface of the heat dissipation water tank, the ends of the two shunt pipes away from the heat dissipation water tank are commonly connected and fixed to the arc of the water supply straight pipe, the side of the smoke supply pipe close to the water supply straight pipe is fixedly connected with a cold conduction plate, the cold conduction plate is an aluminum alloy plate, the straight water supply pipe and the sides of the two shunt pipes away from the smoke supply pipe are commonly fixedly connected with an outer shell, the outer shell is fixedly connected to the smoke supply pipe, a pipe temperature sensor is installed on the upper surface of the straight pipe part of the smoke supply pipe, and the pipe temperature sensor is located on the side of the heat dissipation water tank away from the furnace body.

[0021] By adopting this preferred solution, the auxiliary structure can be set up to maximize the utilization of the cold water delivery process, and the cold water temperature can be transferred to the smoke conveying pipe with the help of the cold conduction plate, thereby improving the cooling effect.

[0022] Preferably, the support structure includes a support assembly, and the support assembly includes a support seat, the support seat is fixedly connected to the lower surface of the radiator water tank, two support columns are fixedly connected to the lower surface of the support seat, the sides of the two support columns close to each other are commonly fixedly connected to the assembly pipe, the lower surface of the assembly pipe is fixedly connected with a cross plate, the sides of the two support columns close to each other are commonly fixedly connected to both ends of the cross plate, one end of the support column away from the support seat is fixedly connected to a support foot, and the side of the support column close to the denitrification tank is fixedly connected to an auxiliary support plate.

[0023] By adopting this preferred solution, the support structure can be provided to greatly reduce the pressure on the smoke conveying pipe, thereby preventing the heat dissipation water tank filled with water from pressing the smoke conveying pipe to deformation.

[0024] Preferably, the denitration method comprises the following:

[0025] S1. When the flue gas generated by the natural gas heating furnace passes through the flue gas outlet, the water pump starts and the cold water in the heat dissipation water tank is concentrated from the three pipes of the water delivery straight pipe and the two branch pipes to the water delivery elbow. The temperature of the cold water will be transferred to the smoke delivery pipe by the cold guide plate to cool the smoke delivery pipe. After the flue gas passes through the pipeline temperature sensor, the automatic solenoid valve will adjust the flow of the water delivery elbow according to the detection stability. The cold water after the flow adjustment will directly rush to the auxiliary pipe. With the help of the structure of the booster inner pipe with a wide top and a narrow bottom, the water pressure is increased to a certain extent. The two rotating plates are squeezed to open to both sides by the water pressure. After passing through the rotating plate, the cold water will impact the lower booster plate. The lower booster plate is forced to move downward with the sliding frame to pull the tension spring. The gap between the upper booster plate and the lower booster plate can form a nozzle for full-angle spraying.

[0026] S2. After the flue gas is cooled by spraying, it is cooled again in the area where the cooling plate is attached, and then it can smoothly enter the denitrification box to use the medium-temperature denitrification agent for denitrification treatment. The harmless gas after treatment is discharged through the exhaust port;

[0027] S3. The water pump will generate certain vibrations during operation. The support seat under the radiator water tank and the two support columns can reduce the shaking of the radiator water tank. At the same time, the support seat will also support components such as the assembly pipe.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] 1. In the present invention, when the flue gas generated by the natural gas heating furnace passes through the flue gas outlet, the water pump is started to transport the cold water in the heat dissipation water tank downward from the water delivery straight pipe. After the flue gas passes through the pipeline temperature sensor, the automatic solenoid valve will adjust the flow of the water delivery elbow according to the detection stability. The cold water after the flow is adjusted directly rushes into the auxiliary pipe. The water pressure is increased to a certain extent by means of the structure of the boost inner pipe which is wide at the top and narrow at the bottom. The two rotating plates are squeezed to open to both sides by the water pressure. This structure will further squeeze the water flow to increase the pressure. The two baffles will limit the maximum rotation angle of the rotating plate. After passing through the rotating plate, the cold water will impact the lower boost plate. The lower boost plate is forced to move downward with the sliding frame to pull the tension spring. The gap between the upper boost plate and the lower boost plate can form a full-angle spray nozzle. By setting the spray structure, the flue gas in the smoke delivery pipe can be cooled to a corresponding degree according to the flue gas temperature, thereby overcoming the defect that the existing medium-temperature SCR catalyst is not suitable for flue gas denitration treatment of natural gas heating furnaces.

[0030] 2. In the present invention, after the flue gas is sprayed for cooling, it will enter the denitrification box and use a medium-temperature denitrification agent for denitrification treatment. The harmless gas after treatment is discharged through the smoke exhaust port, wherein the bellows can protect the spring from rusting in contact with cold water, thereby affecting normal use. The guide groove can still run water spraying when the upper boost plate and the lower boost pipe are fully fitted, to prevent the lower extrusion plate from being squeezed downward by the inability to form pressure in the right direction due to full fitting. By setting the boost assembly, the upper boost plate and the lower boost plate can achieve adjustable spacing with the help of an L-shaped rod and a sliding frame, and the spacing between the upper boost plate and the lower boost plate can be kept very close with the help of a spring, so that the cold water will be squeezed and diffused during the spraying process.

[0031] 3. In the present invention, when cold water flows from the straight water pipe and two branch pipes to the water elbow and finally flows into the water elbow, the water pressure will increase due to the change of the pipe capacity. During the transportation process, the temperature of the cold water will be transferred to the smoke pipe by the cold conduction plate to cool the smoke pipe. By setting an auxiliary structure, the cold water transportation process can be maximized, and the cold water temperature can be transferred to the smoke pipe with the help of the cold conduction plate to improve the cooling effect.

[0032] 4. In the present invention, a certain vibration will be generated during the operation of the water pump. The support seat under the radiator water tank cooperates with the two support columns to slow down the shaking of the radiator water tank. At the same time, the support seat will also support the assembly pipe and other components. By setting the support structure, the pressure on the smoke conveying pipe can be greatly reduced, preventing the radiator water tank filled with water from pressing the smoke conveying pipe to deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional structural schematic diagram of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0034] Figure 2 The present invention proposes a natural gas heating furnace heat recovery SCR denitrification device and denitrification method Figure 1 Schematic diagram of local structure;

[0035] Figure 3 The present invention proposes a natural gas heating furnace heat recovery SCR denitrification device and denitrification method Figure 2 Schematic diagram of partial disassembly of some structures;

[0036] Figure 4 The present invention proposes a natural gas heating furnace heat recovery SCR denitrification device and denitrification method Figure 3 Schematic diagram of partial disassembly of some structures;

[0037] Figure 5 A schematic diagram of the disassembly of the auxiliary structure of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0038] Figure 6 The present invention proposes a natural gas heating furnace heat recovery SCR denitrification device and denitrification method Figure 4 Schematic diagram of partial disassembly of some structures;

[0039] Figure 7 A schematic diagram of a spray assembly of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0040] Figure 8 A schematic diagram of the disassembly of a spray assembly of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0041] Fig. 9 A bottom view of the partial structure of a spray assembly of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0042] Fig.10 The present invention proposes a natural gas heating furnace heat recovery SCR denitrification device and denitrification method Figure 7 Schematic diagram of partial disassembly of some structures;

[0043] Fig.11 A schematic diagram of the bottom structure of the pressurized inner tube of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0044] Fig.12 A schematic diagram of the partial structure of a spray assembly of a natural gas heating furnace heat recovery SCR denitration device and a denitration method proposed by the present invention;

[0045] Fig.13 The present invention provides a cross-sectional view of a pressurized inner tube of a natural gas heating furnace heat recovery SCR denitration device and a denitration method.

[0046] Legend: 1. Furnace body; 2. Spray structure; 21. Cooling assembly; 211. Heat sink; 212. Water pump; 213. Water inlet; 214. Sealing cover; 215. Water delivery straight pipe; 216. Water delivery elbow; 217. Automatic solenoid valve; 218. Assembly pipe; 219. Auxiliary pipe; 22. Spray assembly; 221. Boost inner pipe; 222. Rotating frame; 223. Rotating rod; 224. Rotating plate; 225. Reset spring; 226. Sealing plug; 227. Abutment pad; 228. Extension pipe; 229. Baffle; 23. Boost assembly; 231. Wrapping shell; 232. Upper boost Plate; 233, L-shaped rod; 234, sliding block; 235, sliding frame; 236, tension spring; 237, lower boost plate; 238, guide groove; 239, bellows; 3, auxiliary structure; 31, auxiliary component; 311, shunt pipe; 312, cold guide plate; 313, outer shell; 314, pipeline temperature sensor; 4, supporting structure; 41, supporting component; 411, supporting seat; 412, supporting column; 413, supporting foot; 414, horizontal plate; 415, auxiliary supporting plate; 5, denitrification box; 6, bracket; 7, flue gas inlet; 8, flue gas outlet; 9, smoke exhaust port; 10, smoke conveying pipe. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0049] Embodiment 1, as Figure 1-13 As shown, the present invention provides a natural gas heating furnace reheat SCR denitrification device and a denitrification method, comprising a furnace body 1 and a denitrification box 5, a flue gas outlet 8 is provided on one side of the furnace body 1, a flue gas inlet 7 is provided on one side of the denitrification box 5, a smoke exhaust port 9 is provided on the side of the denitrification box 5 away from the flue gas outlet 8, a smoke inlet 7 is fixedly connected to a smoke conveying pipe 10 on the side close to the furnace body 1, the smoke conveying pipe 10 is composed of a straight pipe and a bent pipe, a bracket 6 is fixedly connected to the lower surface of the denitrification box 5, and a spray structure 2 is provided on the side of the bent pipe close to the flue gas outlet 8.

[0050] The specific settings and functions of the spray structure 2, auxiliary structure 3 and support structure 4 are described in detail below.

[0051] like Figure 1 , Figure 2 , Figure 3, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13As shown, the spray structure 2 includes a cooling component 21, a spray component 22 and a boost component 23. The cooling component 21 includes a heat dissipation water tank 211. The heat dissipation water tank 211 is fixedly connected to the side of the smoke conveying pipe 10 close to the furnace body 1. A water pump 212 is installed on the upper surface of the heat dissipation water tank 211. A water inlet 213 is opened on the upper surface of the heat dissipation water tank 211. A sealing cover 214 is threadedly connected to the upper surface of the water inlet 213. A water conveying straight pipe 215 is connected and fixed to the lower surface of the heat dissipation water tank 211. One end of the water conveying straight pipe 215 away from the heat dissipation water tank 211 is connected and fixed to a water conveying elbow 216. An automatic solenoid valve 217 is installed on the arc surface of the water conveying elbow 216. An assembly pipe 218 is fixedly connected to the end of the smoke conveying pipe 10 close to the furnace body 1. The assembly pipe 218 The upper surface of the booster is fixedly connected with an auxiliary pipe 219, and one end of the auxiliary pipe 219 away from the assembly pipe 218 is connected and fixed to the water delivery elbow 216. The spray assembly 22 includes a booster inner pipe 221, and the arc surface of the booster inner pipe 221 is fixedly connected to the inner wall of the auxiliary pipe 219. The inner diameter of the booster inner pipe 221 gradually decreases from top to bottom and the upper end is a flared end. The lower surface of the booster inner pipe 221 is fixedly connected with two rotating frames 222. The inner wall of the rotating frame 222 is fixedly connected with a rotating rod 223, and the arc surface of the rotating rod 223 is rotatably connected with a rotating plate 224. The arc surface of the rotating rod 223 is sleeved with a reset spring 225, and one end of the reset spring 225 is fixedly connected to the rotating plate 224, and the end of the reset spring 225 away from the rotating plate 224 is connected to the rotating frame 222 is fixedly connected, the rotating plate 224 is abutted against the boost inner tube 221, the lower surface of the boost inner tube 221 is fixedly connected with an extension tube 228, the boost assembly 23 includes a wrapping shell 231, the wrapping shell 231 is fixedly connected to the lower surface of the auxiliary tube 219, the wrapping shell 231 is fixedly connected to the arc surface of the extension tube 228, the lower surface of the extension tube 228 is fixedly connected with an upper boost plate 232, the arc surface of the auxiliary tube 219 is fixedly connected with two L-shaped rods 233, the two sides of the L-shaped rod 233 are respectively fixedly connected with sliding blocks 234, the two L-shaped rods 233 are slidably connected with a sliding frame 235 with the help of the sliding blocks 234, the sliding frame 235 is fixedly connected with a lower boost plate 237 on one side close to the upper boost plate 232, and the L-shaped rod 233 is close to the lower boost plate 237. A tension spring 236 is fixedly connected to one end of the sliding frame 235, and one end of the tension spring 236 away from the L-shaped rod 233 is fixedly connected to the sliding frame 235. A bellows 239 is sleeved on the arc surface of the spring, and the bellows 239 is fixedly connected to the end of the L-shaped rod 233 close to the spring, and one end of the bellows 239 away from the L-shaped rod 233 is fixedly connected to the sliding frame 235. Two baffles 229 are fixedly connected to the inner wall of the assembly tube 218, and the sides of the two baffles 229 close to each other are inclined surfaces. A sealing plug 226 is fixedly connected to the side of the rotating plate 224 close to the boost inner tube 221, and the sealing plug 226 is interference-connected with the inner wall of the boost inner tube 221. Two abutment pads 227 are fixedly connected to the side of the rotating plate 224 close to the boost inner tube 221.Two abutment pads 227 abut against the lower surface of the boost inner tube 221. The abutment pads 227 are rubber pads. A plurality of guide grooves 238 are provided on the side of the lower boost plate 237 close to the upper boost plate 232. A plurality of auxiliary grooves are provided on the side of the upper boost plate 232 close to the lower boost plate 237.

[0052] The effect achieved by the entire spray structure 2 is that the smoke in the smoke conveying pipe 10 can be cooled to a corresponding degree according to the smoke temperature by setting the spray structure 2, thereby overcoming the defect that the existing medium-temperature SCR catalyst is not suitable for flue gas denitrification treatment of natural gas heating furnaces.

[0053] like Figure 1 , Figure 2 ,and Figure 3 As shown, the auxiliary structure 3 includes an auxiliary component 31, and the auxiliary component 31 includes two shunt pipes 311, and the two shunt pipes 311 are respectively connected and fixed to the lower surface of the heat dissipation water tank 211, and one end of the two shunt pipes 311 away from the heat dissipation water tank 211 is commonly connected and fixed to the arc of the water supply straight pipe 215, and a side of the smoke supply pipe 10 close to the water supply straight pipe 215 is fixedly connected with a cold guide plate 312, and the cold guide plate 312 is an aluminum alloy plate, and the straight water supply pipe 215 and the two shunt pipes 311 are commonly fixedly connected with an outer shell 313 away from the smoke supply pipe 10. The outer shell 313 is fixedly connected to the smoke supply pipe 10, and a pipe temperature sensor 314 is installed on the upper surface of the straight pipe part of the smoke supply pipe 10, and the pipe temperature sensor 314 is located on the side of the heat dissipation water tank 211 away from the furnace body 1.

[0054] The effect achieved by the entire auxiliary structure 3 is that the auxiliary structure 3 can maximize the use of the cold water delivery process, and the cold water temperature can be transferred to the smoke conveying pipe 10 by means of the cold conduction plate 312, thereby improving the cooling effect.

[0055] like Figure 1 and Figure 3 As shown, the support structure 4 includes a support assembly 41, and the support assembly 41 includes a support seat 411. The support seat 411 is fixedly connected to the lower surface of the heat dissipation water tank 211, and two support columns 412 are fixedly connected to the lower surface of the support seat 411. The sides of the two support columns 412 close to each other are commonly fixedly connected to the assembly pipe 218. The lower surface of the assembly pipe 218 is fixedly connected with a cross plate 414, and the sides of the two support columns 412 close to each other are commonly fixedly connected to the two ends of the cross plate 414. The end of the support column 412 away from the support seat 411 is fixedly connected to a support foot 413, and the side of the support column 412 close to the denitrification box 5 is fixedly connected to an auxiliary support plate 415.

[0056] The denitrification method comprises the following:

[0057] S1. When the flue gas generated by the natural gas heating furnace passes through the flue gas outlet 8, the water pump 212 is started, and the cold water in the heat dissipation water tank 211 is concentrated from the water delivery straight pipe 215 and the two branch pipes 311 to the water delivery elbow 216. The temperature of the cold water will be transferred to the smoke delivery pipe 10 by the cold guide plate 312 to cool the smoke delivery pipe 10. After the flue gas passes through the pipeline temperature sensor 314, the automatic solenoid valve 217 will adjust the flow of the water delivery elbow 216 according to the detection stability. The cold water after the flow adjustment will directly rush into the auxiliary pipe 219. With the help of the structure of the boosting inner pipe 221 that is wide at the top and narrow at the bottom, the water pressure is increased to a certain extent. The two rotating plates 224 are squeezed to open to both sides by the water pressure. After passing through the rotating plate 224, the cold water will impact the lower boosting plate 237. The lower boosting plate 237 is forced to move downward with the sliding frame 235 to pull the tension spring 236. The gap between the upper boosting plate 232 and the lower boosting plate 237 can form a nozzle for full-angle spraying.

[0058] S2, after the flue gas is cooled by spraying, it is cooled again by the area attached with the cold guide plate 312, and then it can smoothly enter the denitration box 5 to use the medium-temperature denitration agent for denitration treatment, and the harmless gas after treatment is discharged through the exhaust port 9;

[0059] S3. The water pump 212 will generate certain vibrations during operation. The support base 411 under the heat sink 211 cooperates with the two support columns 412 to slow down the shaking of the heat sink 211. Meanwhile, the support base 411 also supports the assembly pipe 218 and other components.

[0060] The effect achieved by the entire support structure 4 is that the pressure on the smoke conveying pipe 10 can be greatly reduced by providing the support structure 4, thereby preventing the heat dissipation water tank 211 filled with water from pressing the smoke conveying pipe 10 to deformation.

[0061] The overall working principle is that when the smoke generated by the natural gas heating furnace passes through the smoke outlet 8, the water pump 212 is started to transport the cold water in the heat dissipation water tank 211 downward from the water delivery straight pipe 215. After the smoke passes through the pipeline temperature sensor 314, the automatic solenoid valve 217 will adjust the flow of the water delivery elbow 216 according to the detection stability. The cold water after the flow is adjusted will directly rush into the auxiliary pipe 219. With the help of the structure of the pressurized inner pipe 221 that is wide at the top and narrow at the bottom, the water pressure is increased to a certain extent. The two rotating plates 224 are squeezed to open to both sides by the water pressure. This structure will further squeeze the water flow to increase the pressure The two baffles 229 will limit the extreme angle of rotation of the rotating plate 224. After passing through the rotating plate 224, the cold water will impact the lower boost plate 237. The lower boost plate 237 is forced to move downward with the sliding frame 235 to pull the tension spring 236. The gap between the upper boost plate 232 and the lower boost plate 237 can form a nozzle for full-angle spraying. By setting the spray structure 2, the flue gas in the smoke conveying pipe 10 can be cooled to a corresponding degree according to the flue gas temperature, thereby overcoming the defect that the existing medium-temperature SCR catalyst is not suitable for flue gas denitrification treatment of natural gas heating furnaces.

[0062] After the flue gas is cooled by spraying, it will enter the denitrification box 5 and use a medium-temperature denitrification agent for denitrification treatment. The treated harmless gas is discharged through the smoke exhaust port 9, wherein the bellows 239 can protect the spring from rusting due to contact with cold water, which will affect normal use. The guide groove 238 can still run water spraying when the upper boost plate 232 and the lower boost pipe are fully fitted, to prevent the lower extrusion plate from being squeezed downward by the inability to form pressure in the right direction due to complete fitting. By setting the boost assembly 23, the upper boost plate 232 and the lower boost plate 237 are adjusted in distance with the help of the L-shaped rod 233 and the sliding frame 235, and the distance between the upper boost plate 232 and the lower boost plate 237 can be kept very close with the help of the spring, so that the cold water will be squeezed and diffused during the spraying process.

[0063] When cold water flows from the straight water pipe 215 and the two branch pipes 311 to the water bend pipe 216 and finally flows into the water bend pipe 216, the water pressure will increase due to the change in the pipe capacity. During the transportation process, the temperature of the cold water will be transferred to the smoke pipe 10 by the cold guide plate 312 to cool the smoke pipe 10. By setting up the auxiliary structure 3, the cold water transportation process can be maximized, and the cold water temperature can be transferred to the smoke pipe 10 with the help of the cold guide plate 312 to improve the cooling effect.

[0064] During the operation of the water pump 212, a certain vibration will be generated. The support seat 411 under the heat dissipation water tank 211 cooperates with the two support columns 412 to slow down the shaking of the heat dissipation water tank 211. At the same time, the support seat 411 will also support components such as the assembly pipe 218. By setting up the support structure 4, the pressure on the smoke conveying pipe 10 can be greatly reduced, preventing the heat dissipation water tank 211 filled with water from pressing the smoke conveying pipe 10 to deformation.

Claims

1. A natural gas heating furnace regenerative SCR denitration device, comprising a furnace body (1), a denitration box (5), an auxiliary structure (3) and a supporting structure (4), characterized in that: A smoke outlet (8) is provided on one side of the furnace body (1), a smoke inlet (7) is provided on one side of the denitrification box (5), a smoke exhaust port (9) is provided on the side of the denitrification box (5) away from the smoke outlet (8), a smoke delivery pipe (10) is fixedly connected to the side of the smoke inlet (7) close to the furnace body (1), the smoke delivery pipe (10) is composed of a straight pipe and a curved pipe connected to each other, a bracket (6) is fixedly connected to the lower surface of the denitrification box (5), a spray structure (2) is provided on the side of the curved pipe close to the smoke outlet (8), the spray structure (2) comprises a cooling component (21), a spray component (22) and a pressurizing component (23), the cooling component (21) comprises a heat dissipation water tank (211), the heat dissipation water tank (211) is connected to the smoke delivery pipe (10), and the heat dissipation water tank (211) is connected to the smoke delivery pipe (10). The heat dissipation pipe (10) is fixedly connected to a side close to the furnace body (1); a water pump (212) is installed on the upper surface of the heat dissipation water tank (211); a water inlet (213) is opened on the upper surface of the heat dissipation water tank (211); a sealing cover (214) is threadedly connected to the upper surface of the water inlet (213); a water delivery straight pipe (215) is connected and fixed to the lower surface of the heat dissipation water tank (211); an end of the water delivery straight pipe (215) away from the heat dissipation water tank (211) is connected and fixed to a water delivery elbow (216); an automatic solenoid valve (217) is installed on the arc surface of the water delivery elbow (216); an assembly pipe (218) is fixedly connected to the end of the smoke delivery pipe (10) close to the furnace body (1); and the upper surface of the assembly pipe (218) is fixedly connected to The auxiliary pipe (219) is connected to the auxiliary pipe (219), one end of the auxiliary pipe (219) away from the assembly pipe (218) is connected and fixed to the water delivery elbow (216), the spray assembly (22) comprises a pressurized inner pipe (221), the arc surface of the pressurized inner pipe (221) is fixedly connected to the inner wall of the auxiliary pipe (219), the inner diameter of the pressurized inner pipe (221) gradually decreases from top to bottom and the upper end is a flared end, the lower surface of the pressurized inner pipe (221) is fixedly connected to two rotating frames (222), the inner wall of the rotating frame (222) is fixedly connected to a rotating rod (223), the arc surface of the rotating rod (223) is rotatably connected to a rotating plate (224), the arc surface of the rotating rod (223) is sleeved with a reset spring (225), the reset spring One end of the spring (225) is fixedly connected to the rotating plate (224), and one end of the return spring (225) away from the rotating plate (224) is fixedly connected to the rotating frame (222), the rotating plate (224) is in contact with the boost inner tube (221), and the lower surface of the boost inner tube (221) is fixedly connected to an extension tube (228), the boost assembly (23) comprises a wrapping shell (231), the wrapping shell (231) is fixedly connected to the lower surface of the auxiliary tube (219), the wrapping shell (231) is fixedly connected to the arc surface of the extension tube (228), the lower surface of the extension tube (228) is fixedly connected to an upper boost plate (232), and the arc surface of the auxiliary tube (219) is fixedly connected to two L-shaped rods (233),The two sides of the L-shaped rod (233) are respectively fixedly connected to sliding blocks (234), and the two L-shaped rods (233) are slidably connected to a sliding frame (235) by means of the sliding blocks (234). The side of the sliding frame (235) close to the upper boost plate (232) is fixedly connected to the lower boost plate (237), and one end of the L-shaped rod (233) close to the sliding frame (235) is fixedly connected to a tension spring (236), and one end of the tension spring (236) away from the L-shaped rod (233) is fixedly connected to the sliding frame (235).

2. A natural gas heating furnace reheat SCR denitration device according to claim 1, characterized in that: The arc surface of the spring is sleeved with a bellows (239), the bellows (239) is fixedly connected to an end of the L-shaped rod (233) close to the spring, and an end of the bellows (239) away from the L-shaped rod (233) is fixedly connected to the sliding frame (235).

3. A natural gas heating furnace reheat SCR denitration device according to claim 2, characterized in that: Two baffles (229) are fixedly connected to the inner wall of the assembly tube (218), and the sides of the two baffles (229) that are close to each other are inclined surfaces.

4. A natural gas heating furnace reheat SCR denitration device according to claim 3, characterized in that: A sealing plug (226) is fixedly connected to one side of the rotating plate (224) close to the boost inner tube (221), and the sealing plug (226) is interference-connected with the inner wall of the boost inner tube (221).

5. A natural gas heating furnace reheat SCR denitration device according to claim 4, characterized in that: Two abutment pads (227) are fixedly connected to one side of the rotating plate (224) close to the boost inner tube (221); the two abutment pads (227) abut against the lower surface of the boost inner tube (221); the abutment pads (227) are rubber pads.

6. A natural gas heating furnace reheat SCR denitration device according to claim 5, characterized in that: A plurality of guide grooves (238) are provided on a side of the lower supercharging plate (237) close to the upper supercharging plate (232), and a plurality of auxiliary grooves are provided on a side of the upper supercharging plate (232) close to the lower supercharging plate (237).

7. A natural gas heating furnace reheat SCR denitration device according to claim 6, characterized in that: The auxiliary structure (3) comprises an auxiliary component (31), the auxiliary component (31) comprising two shunt pipes (311), the two shunt pipes (311) being respectively connected and fixed to the lower surface of the heat dissipation water tank (211), one end of the two shunt pipes (311) away from the heat dissipation water tank (211) being connected and fixed to the arc of the water delivery straight pipe (215), and a side of the smoke delivery pipe (10) close to the water delivery straight pipe (215) being fixedly connected to a cold conduction plate (312). The cooling plate (312) is an aluminum alloy plate; the straight water delivery pipe (215) and the two branch pipes (311) are fixedly connected to an outer shell (313) on a side away from the smoke delivery pipe (10); the outer shell (313) is fixedly connected to the smoke delivery pipe (10); a pipe temperature sensor (314) is installed on the upper surface of the straight pipe portion of the smoke delivery pipe (10); the pipe temperature sensor (314) is located on a side of the heat dissipation water tank (211) away from the furnace body (1).

8. A natural gas heating furnace reheat SCR denitration device according to claim 7, characterized in that: The support structure (4) comprises a support assembly (41), wherein the support assembly (41) comprises a support seat (411), wherein the support seat (411) is fixedly connected to the lower surface of a heat dissipation water tank (211), wherein the lower surface of the support seat (411) is fixedly connected to two support columns (412), wherein the sides of the two support columns (412) close to each other are fixedly connected to an assembly pipe (218), wherein the lower surface of the assembly pipe (218) is fixedly connected to a transverse plate (414), wherein the sides of the two support columns (412) close to each other are fixedly connected to both ends of the transverse plate (414), wherein one end of the support column (412) away from the support seat (411) is fixedly connected to a support foot (413), and the side of the support column (412) close to the denitration box (5) is fixedly connected to an auxiliary support plate (415).

9. A natural gas heating furnace reheat SCR denitration method, using a natural gas heating furnace reheat SCR denitration device as claimed in claim 8, characterized in that: The denitrification method comprises the following: S1. When the flue gas generated by the natural gas heating furnace passes through the flue gas outlet (8), the water pump (212) is started, and the cold water in the heat dissipation water tank (211) is concentrated from the three pipes of the water delivery straight pipe (215) and the two branch pipes (311) to the water delivery elbow (216). The temperature of the cold water is transferred to the smoke delivery pipe (10) by the cold guide plate (312) to cool the smoke delivery pipe (10). After the flue gas passes through the pipe temperature sensor (314), the automatic solenoid valve (217) adjusts the temperature of the water delivery elbow (216) according to the detection stability. The flow rate is adjusted, and the cold water after the flow rate is adjusted directly flows into the auxiliary pipe (219). With the help of the structure of the boosting inner pipe (221) that is wide at the top and narrow at the bottom, the water pressure is increased to a certain extent. The two rotating plates (224) are squeezed to open to both sides by the water pressure. After passing through the rotating plate (224), the cold water impacts the lower boosting plate (237). The lower boosting plate (237) is forced to move downward with the sliding frame (235) to pull the tension spring (236). The gap between the upper boosting plate (232) and the lower boosting plate (237) can form a nozzle for full-angle spraying. S2, after the flue gas is cooled by spraying, it is cooled again in the area where the cooling plate (312) is attached, and then it can smoothly enter the denitration box (5) for denitration treatment using a medium-temperature denitration agent, and the harmless gas after treatment is discharged through the exhaust port (9); S3. During the operation of the water pump (212), a certain vibration will be generated. The support seat (411) below the heat dissipation water tank (211) cooperates with the two support columns (412) to reduce the shaking of the heat dissipation water tank (211). At the same time, the support seat (411) also supports the assembly pipe (218).

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