Flue gas denitration and heat recovery device for industrial furnace

Abstract

The invention discloses an industrial furnace flue gas denitration and heat recovery device, which relates to the technical field of flue gas treatment, and comprises a denitration reactor, an air preheater, a multi-stage catalyst, a soot blowing mechanism, an ammonia gas generator, a reflux pipeline and a switching plate. The backflow pipeline and the switching plate are arranged, and the nitrogen-oxygen sensor is used for monitoring the emission content of nitrogen oxide at the smoke outlet of the denitration reactor, so that the switching plate can control communication between the backflow pipeline and the smoke outlet of the denitration reactor according to the emission content of the nitrogen oxide, the emission content of the nitrogen oxide in smoke is controlled, and the emission standard is improved. The multi-stage catalytic converter is arranged, and the soot blowing mechanism is arranged above the multi-stage catalytic converter, so that steam soot blowing treatment is performed on the multi-stage catalytic converter, the problem that the catalytic efficiency is affected due to the fact that soot in flue gas is accumulated to block a catalytic converter passage is solved, and the catalytic efficiency of the catalytic converter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and specifically to an industrial furnace flue gas denitration and heat recovery device. Background Art

[0002] The flue gas generated by the combustion of industrial furnaces contains a large amount of nitrogen oxides and needs to be denitrified. After the reducing agent ammonia is uniformly mixed with the flue gas, it then passes through a catalytic reactor filled with a catalyst to cause the nitrogen oxides and ammonia in the flue gas to undergo a reduction reaction, generating nitrogen and water, so that the nitrogen oxide content in the flue gas is controlled below the emission limit. Designing and building a denitrification reactor that meets the emission standards is a basic requirement for industrial enterprises in environmental protection engineering design and environmental protection engineering construction.

[0003] As an environmental protection project for reducing the nitrogen oxide emission content, the denitrification treatment project needs to consider various factors during design and construction. It is necessary to consider the nitrogen oxide emission content and also the emission temperature, and use a heat recovery device to recover and utilize the residual heat in the flue gas to improve the heat utilization efficiency. At present, most of the denitrification reactors used for industrial furnace flue gas denitrification are of single-channel structure. Due to factors such as catalysis and insufficient combustion of industrial furnaces during the use of the denitrification reactor, the nitrogen oxide emission content will be on the high side. Therefore, this application proposes an industrial furnace flue gas denitration and heat recovery device with flue gas reflux. Summary of the Invention

[0004] The present invention provides an industrial furnace flue gas denitration and heat recovery device, aiming to solve the above-mentioned existing problems.

[0005] To achieve the above object, the present invention provides an industrial furnace flue gas denitration and heat recovery device, including:

[0006] A denitrification reactor, whose flue gas inlet is connected to the exhaust port of a low-nitrogen burner;

[0007] An air preheater, one end of which is connected to the flue gas outlet of the denitrification reactor, and the other end is connected to the air inlet of the low-nitrogen burner, so that the waste heat of the flue gas passing through the denitrification reactor preheats the air entering the low-nitrogen burner through the air preheater;

[0008] A multi-stage catalytic converter, which is arranged in the denitrification reactor;

[0009] An ammonia generator, which is arranged at the flue gas inlet of the denitrification reactor;

[0010] A soot blowing mechanism, which is arranged in the denitrification reactor and above the multi-stage catalytic converter;

[0011] A reflux pipeline, which is connected to the flue gas outlet and the flue gas inlet of the denitrification reactor;

[0012] The switching board is rotatably arranged at the reflux pipeline so that the smoke outlet can be selectively communicated with the reflux pipeline and the air preheater respectively.

[0013] As one embodiment of the present invention, a nitrogen oxide sensor for monitoring the emission content of nitrogen oxides is arranged in the smoke outlet. The switching board is opened and closed in the reflux pipeline through an electric push rod or a pneumatic push rod. Both the nitrogen oxide sensor and the electric push rod or the pneumatic push rod are electrically connected to the controller.

[0014] The ammonia generator is provided with multiple spray pipes, and multiple nozzles are arranged on the spray pipes; the ammonia generator is also communicated with the pipeline of the air inlet through a pipeline.

[0015] As one embodiment of the present invention, the multi-stage catalytic converter includes a primary catalytic converter, a secondary catalytic converter and a tertiary catalytic converter; the soot blowing mechanism includes a first soot blowing mechanism, a second soot blowing mechanism and a third soot blowing mechanism. The first soot blowing mechanism, the second soot blowing mechanism and the third soot blowing mechanism are respectively arranged above the primary catalytic converter, the secondary catalytic converter and the tertiary catalytic converter.

[0016] The first soot blowing mechanism, the second soot blowing mechanism and the third soot blowing mechanism all include a first jet device, a second jet device and a third jet device. The first jet device, the second jet device and the third jet device are arranged in a row above the multi-stage catalytic converter.

[0017] As one embodiment of the present invention, the first jet device, the second jet device and the third jet device all include a telescopic rod, a main spray pipe, a secondary spray pipe and multiple spray nozzles arranged on the secondary spray pipe. The telescopic rod is arranged on the outer wall of the denitration reactor through a mounting bracket; the main spray pipe is connected to the output end of the telescopic rod and is located inside the denitration reactor. The secondary spray pipes are uniformly distributed along the axial direction and communicated with both sides of the main spray pipe.

[0018] The primary catalytic converter, the secondary catalytic converter and the tertiary catalytic converter are arranged in the denitration reactor through a sliding frame. Screw lifting mechanisms are threadedly connected to both sides of the sliding frame; the ends of the second soot blowing mechanism and the third soot blowing mechanism are meshed with the sliding frame through a flipping mechanism so that the second soot blowing mechanism and the third soot blowing mechanism can be flip-arranged in the denitration reactor.

[0019] As one embodiment of the present invention, the flipping mechanism includes a sliding sleeve, a polygonal rod, a turntable and a rotating gear. The sliding sleeve is fixedly connected to the end of the main spray pipe. The polygonal rod is rotatably arranged on the inner wall of the denitration reactor through a bearing. The sliding sleeve is slidably sleeved on the polygonal rod. The turntable and the rotating gear are arranged at one end of the polygonal rod. Multiple push rods are arranged at one end of the sliding frame. A first rack and a second rack are arranged at intervals on the push rods. The sliding frame makes the first rack and the second rack respectively mesh with the rotating gear through a lifting movement.

[0020] A fixing groove is axially provided on one side of the push rod. The push rod is also provided with a first inlet groove and a second inlet groove, and the first inlet groove and the second inlet groove are communicated with the fixing groove; a first protrusion and a second protrusion are arranged on the turntable, and the turntable rotates to enable the first protrusion to enter the fixing groove through the first inlet groove, and the second protrusion to enter the fixing groove through the second inlet groove.

[0021] As one embodiment of the present invention, the first rack and the second rack that cooperate with the first jet device and the third jet device on the second soot blowing mechanism, and the first jet device and the third jet device on the third soot blowing mechanism are respectively arranged opposite to each other.

[0022] Compared with the prior art, it has the following beneficial effects:

[0023] 1. Improve the emission standard. By setting a reflux pipeline and a switching plate, and monitoring the emission content of nitrogen oxides at the smoke outlet of the denitration reactor through a nitrogen oxide sensor, the switching plate can control the connection between the reflux pipeline and the smoke outlet of the denitration reactor according to the emission content of nitrogen oxides, so as to control the emission content of nitrogen oxides in the flue gas.

[0024] 2. Improve the catalytic efficiency of the catalytic converter. By setting a multi-stage catalytic converter and arranging a soot blowing mechanism above the multi-stage catalytic converter to perform steam soot blowing treatment on the multi-stage catalytic converter, the problem of ash accumulation in the flue gas blocking the catalytic converter passage and thus affecting the catalytic efficiency is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only the preferred embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of an industrial furnace flue gas denitration and heat recovery device of the present application;

[0027] Figure 2 It is an external schematic diagram of the denitration reactor of the present application;

[0028] Figure 3 It is an internal schematic diagram of the denitration reactor of the present application;

[0029] Figure 4 For Figure 3 The enlarged schematic diagram at position A in

[0030] Figure 5 It is an internal schematic diagram of the denitration reactor of the present application;

[0031] Figure 6 ForFigure 5 Enlarged schematic view at B in

[0032] Figure 7 Schematic view of the sliding frame of the present application

[0033] Figure 8 is Figure 7 Enlarged schematic view at C in

[0034] Figure 9 is Figure 7 Enlarged schematic view at D in

[0035] Figure 10 Internal side view of the denitration reactor of the present application

[0036] Figure 11 is Figure 10 Enlarged schematic view at E in

[0037] Reference numerals: 1 - denitration reactor; 11 - flue gas inlet; 12 - flue gas outlet; 2 - air preheater; 3 - multi - stage catalytic converter; 31 - primary catalytic converter; 33 - secondary catalytic converter; 33 - tertiary catalytic converter; 4 - ammonia generator; 5 - soot blowing mechanism; 51 - first soot blowing mechanism; 52 - second soot blowing mechanism; 53 - third soot blowing mechanism; 501 - first jet device; 502 - second jet device; 503 - third jet device; 5011 - telescopic rod; 5012 - main spray pipe; 5013 - auxiliary spray pipe; 5014 - spray nozzle; 5015 - mounting bracket; 5016 - steam pipeline joint; 6 - reflux pipeline; 7 - switching plate; 8 - screw lifting mechanism; 9 - flipping mechanism; 91 - sliding sleeve; 92 - polygonal rod; 93 - turntable; 94 - rotating tooth; 95 - first protrusion; 96 - second protrusion; 10 - sliding frame; 101 - push rod; 102 - first rack; 103 - second rack; 104 - fixing groove; 105 - first inlet groove; 106 - second inlet groove. Detailed implementation mode

[0038] In order to more easily understand the structure of the present invention and the functional features and advantages that can be achieved, the following will describe the preferred embodiments of the present invention in detail in conjunction with the drawings as follows:

[0039] Embodiment 1:

[0040] As Figures 1 to 4 shown, the present invention provides an industrial furnace flue gas denitration and heat recovery device, including:

[0041] A denitration reactor 1, whose flue gas inlet 11 is connected to the exhaust port of a low - nitrogen burner;

[0042] An air preheater 2, one end of which is connected to the flue gas outlet 12 of the denitration reactor 1, and the other end of which is connected to the inlet of the low-nitrogen burner, so that the waste heat of the flue gas passing through the denitration reactor 1 preheats the air entering the low-nitrogen burner through the air preheater 2;

[0043] A multi-stage catalytic converter 3 is provided in the denitration reactor 1;

[0044] An ammonia generator 4 is provided at the flue gas inlet 11 of the denitration reactor 1;

[0045] A soot blowing mechanism 5 is provided in the denitration reactor 1 and above the multi-stage catalytic converter 3;

[0046] A reflux pipeline 6 is connected to the flue gas outlet 12 and the flue gas inlet 11 of the denitration reactor 1;

[0047] A switching plate 7 is rotatably provided at the reflux pipeline 6, so that the flue gas outlet 12 is selectively connected to the reflux pipeline 6 and the air preheater 2 respectively.

[0048] It further includes a rectifier, which is provided in the denitration reactor 1 and above the multi-stage catalytic converter 3.

[0049] Further, a one-way exhaust fan can be provided in the reflux pipeline 6, and when the switching plate 7 is opened to connect the loop pipeline to the flue gas outlet 12 of the denitration reactor 1, the exhaust fan works.

[0050] A nitrogen-oxygen sensor for monitoring the emission content of nitrogen oxides is provided in the flue gas outlet 12 of the present invention. The switching plate 7 is opened and closed in the reflux pipeline 6 by an electric push rod 101 or a pneumatic push rod 101. The nitrogen-oxygen sensor and the electric push rod 101 or the pneumatic push rod 101 are both electrically connected to a controller. The emission content of nitrogen oxides at the flue gas outlet 12 of the denitration reactor 1 is monitored by the nitrogen-oxygen sensor, and the monitoring result is sent to the controller in real time, so that the controller can control the opening and closing of the switching plate 7 at any time, so that the flue gas that does not reach the emission standard enters the denitration reactor 1 again through the reflux pipeline 6 for catalytic reaction.

[0051] See Figure 1 , the ammonia generator 4 of the present invention is provided with multiple spray pipes, and multiple spray heads are provided on the spray pipes; the ammonia generator 4 is also connected to the pipeline of the air inlet through a pipeline, so that air and ammonia are mixed and then enter the denitration reactor 1. A valve is provided on the pipeline, and the air flow rate can be controlled and the pipeline can be closed through the valve.

[0052] See Figure 3, the multi-stage catalytic converter 3 of the present invention includes a primary catalytic converter 31, a secondary catalytic converter 32, and a tertiary catalytic converter 33; the soot blowing mechanism 5 includes a first soot blowing mechanism 51, a second soot blowing mechanism 52, and a third soot blowing mechanism 53, and the first soot blowing mechanism 51, the second soot blowing mechanism 52, and the third soot blowing mechanism 53 are respectively disposed above the primary catalytic converter 31, the secondary catalytic converter 32, and the tertiary catalytic converter 33. By providing the multi-stage catalytic converter 3, multi-stage catalytic treatment of flue gas is achieved.

[0053] See Figure 3 , the first soot blowing mechanism 51, the second soot blowing mechanism 52, and the third soot blowing mechanism 53 of the present invention all include a first jet device 501, a second jet device 502, and a third jet device 503, and the first jet device 501, the second jet device 502, and the third jet device 503 are arranged in rows above the multi-stage catalytic converter 3.

[0054] A sound wave device is also provided in the denitration reactor 1 of the present invention, and the sound wave device is located above one side of the primary catalytic converter 31, the secondary catalytic converter 32, and the tertiary catalytic converter 33.

[0055] See Figure 4 , the first jet device 501, the second jet device 502, and the third jet device 503 of the present invention all include a telescopic rod 5011, a main spray pipe 5012, a secondary spray pipe 5013, and a plurality of spray nozzles 5014 provided on the secondary spray pipe 5013. The telescopic rod 5011 is provided on the outer wall surface of the denitration reactor 1 through a mounting bracket 5015; the main spray pipe 5012 is connected to the output end of the telescopic rod 5011 and is located inside the denitration reactor 1, and the secondary spray pipes 5013 are uniformly distributed and communicated on both sides of the main spray pipe 5012 along the axial direction. The telescopic rod 5011 is an electric push rod or a hydraulic push rod.

[0056] See Figure 5 and Figure 7 , the primary catalytic converter 31, the secondary catalytic converter 32, and the tertiary catalytic converter 33 are arranged in the denitration reactor 1 through a sliding frame 10, and screw lifting mechanisms 8 are threadedly connected to both sides of the sliding frame 10; the ends of the second soot blowing mechanism 52 and the third soot blowing mechanism 53 are engaged with the sliding frame 10 through a flipping mechanism 9, so that the second soot blowing mechanism 52 and the third soot blowing mechanism 53 can be flip-mounted in the denitration reactor 1.

[0057] The present invention facilitates the control of the lifting of the primary catalytic converter 31, the secondary catalytic converter 32, and the tertiary catalytic converter 33 in the denitration reactor 1 for disassembly and replacement by providing the sliding frame 10. A disassembly opening is provided on one side of the denitration reactor 1.

[0058] See Figure 7 and Figure 8, there are two sets of screw lifting mechanisms 8, which are respectively arranged on both sides of the outer wall of the denitration reactor 1. The screw lifting mechanism 8 includes a driving motor and a lifting screw. The output end of the driving motor is connected to the lifting screw through a coupling. The sliding frame 10 includes three frames. One side of the three frames is connected by multiple connecting rods. Both sides of the three frames are threadedly connected to the lifting screw through sliders, so that the driving motor can synchronously control the lifting movement of the three frames.

[0059] Embodiment 2:

[0060] As another embodiment of the present invention, as Figure 7 and Figure 8 shown, the flipping mechanism 9 of the present invention includes a sliding sleeve 91, a polygonal rod 92, a turntable 93 and a rotating tooth 94. The sliding sleeve 91 is fixedly connected to the end of the main spray pipe 5012. The polygonal rod 92 is rotatably arranged on the inner wall of the denitration reactor 1 through a bearing. The sliding sleeve 91 is slidably sleeved on the polygonal rod 92 and can rotate together with the polygonal rod 92. The turntable 93 and the rotating tooth 94 are arranged at one end of the polygonal rod 92. One end of the sliding frame 10 is provided with multiple push rods 101. First racks 102 and second racks 103 are arranged at intervals on the push rods 101. The sliding frame 10 makes the first rack 102 and the second rack 103 respectively engage and drive with the rotating tooth 94 through the lifting movement.

[0061] Specifically, the number of teeth of the first rack 102 is less than the number of teeth of the second rack 103, so that when the push rod 101 descends, the first rack 102 first drives the rotating tooth 94 to drive the main spray pipe 5012 to rotate by a certain angle to spray and wash the catalyst located below it obliquely. When the push rod 101 descends until the second rack 103 engages with the rotating tooth 94, the rotating tooth 94 drives the main spray pipe 5012 to rotate until the spray port 5014 on the auxiliary spray pipe 5013 is vertically opposite to the lower part of the previous catalyst, so as to facilitate steam soot blowing on the bottoms of the primary catalyst 31 and the secondary catalyst 32.

[0062] See Figure 8 and Figure 11, on one side of the push rod 101 of the present invention, a fixing groove 104 is axially arranged. The push rod 101 is also provided with a first inlet groove 105 and a second inlet groove 106, and the first inlet groove 105 and the second inlet groove 106 communicate with the fixing groove 104; a first protrusion 95 and a second protrusion 96 are arranged on the turntable 93. The turntable 93 rotates to enable the first protrusion 95 to enter the fixing groove 104 through the first inlet groove 105, and the second protrusion 96 to enter the fixing groove 104 through the second inlet groove 106. During the downward movement of the push rod 101, the first protrusion 95 on the turntable 93 enters the fixing groove 104 from the first inlet groove 105 through the meshing of the rotating tooth 94 and the first rack 102, so that the fixing groove 104 can limit the rotating tooth 94 through the first protrusion 95, thereby limiting the main spray pipe 5012 after rotating a certain angle, and enabling it to maintain a certain inclination angle until the rotating tooth 94 meshes with the second rack 103. At this time, with the downward movement of the push rod 101, the first protrusion 95 disengages from the fixing groove 104 through the second inlet groove 106, and the second protrusion 96 enters the fixing groove 104 through the second inlet groove 106, so that the nozzle 5014 on the auxiliary spray pipe 5013 can be horizontally facing the bottom surfaces of the first catalytic converter and the second catalytic converter.

[0063] Furthermore, the main spray pipe 5012 on the second soot blowing mechanism 52 and the third soot blowing mechanism 53 of the present invention is rotationally communicated with the steam pipeline joint 5016; the steam pipeline joint 5016 is fixedly connected to the output end of the telescopic rod 5011. Since the first soot blowing mechanism 51 does not require the main spray pipe 5012 to be flipped, the main spray pipe 5012 thereon does not need to be rotationally connected to the steam pipeline joint 5016.

[0064] Embodiment Three:

[0065] As one embodiment of the present invention, as Figure 6 shown, the first rack 102 and the second rack 103 that cooperate with the first jet device 501 and the third jet device 503 on the second soot blowing mechanism 52, and the first jet device 501 and the third jet device 503 on the third soot blowing mechanism 53 are respectively arranged opposite to each other.

[0066] Specifically, a first push rod for controlling the flipping of the second soot blowing mechanism 52 and a second push rod for controlling the flipping of the third soot blowing mechanism 53 are provided on the sliding carriage 10, and there are three first push rods and three second push rods respectively. The first rack 102 and the second rack 103 on the push rod 101 at both ends of the first push rod are horizontally opposite to each other, so that two of the three main spray pipes 5012 on both sides can rotate synchronously in different directions during the downward movement of the push rod 101, so that the main spray pipes 5012 on both sides drive the auxiliary spray pipes 5013 to incline and spray steam on the catalyst located below them. The main spray pipe 5012 in the middle of the three main spray pipes 5012 can rotate synchronously and in the same direction as one of the main spray pipes 5012 during the downward movement of the push rod 101.

[0067] The above is only the preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention all fall within the protection scope of this technical solution.

Claims

1. An industrial furnace flue gas denitration and heat recovery device, characterized in that Including: A denitration reactor (1), whose flue gas inlet (11) is connected to the flue gas outlet of a low-nitrogen burner; An air preheater (2), one end of which is connected to the flue gas outlet (12) of the denitration reactor (1), and the other end of which is connected to the air inlet of the low-nitrogen burner, so that the waste heat of the flue gas passing through the denitration reactor (1) preheats the air entering the low-nitrogen burner through the air preheater (2); A multi-stage catalytic converter (3), which is arranged in the denitration reactor (1); An ammonia generator (4), which is arranged at the flue gas inlet (11) of the denitration reactor (1); A soot blowing mechanism (5), which is arranged in the denitration reactor (1) and above the multi-stage catalytic converter (3); A reflux pipeline (6), which is communicated with the flue gas outlet (12) and the flue gas inlet (11) of the denitration reactor (1); A switching plate (7), which is rotatably arranged at the reflux pipeline (6) to enable the flue gas outlet (12) to be selectively communicated with the reflux pipeline (6) and the air preheater (2) respectively.

2. The industrial furnace flue gas denitration and heat recovery device according to claim 1, wherein, A nitrogen-oxygen sensor for monitoring the emission content of nitrogen oxides is arranged in the flue gas outlet (12). The switching plate (7) is opened and closed in the reflux pipeline (6) by an electric push rod (101) or a pneumatic push rod (101). Both the nitrogen-oxygen sensor and the electric push rod (101) or the pneumatic push rod (101) are electrically connected to a controller.

3. The industrial furnace flue gas denitration and heat recovery device according to claim 2, wherein The ammonia generator (4) is provided with multiple spray pipes, and multiple spray nozzles are arranged on the spray pipes; the ammonia generator (4) is also communicated with the pipeline of the air inlet through a pipeline.

4. The industrial furnace flue gas denitration and heat recovery device according to claim 1, wherein, The multi-stage catalytic converter (3) includes a primary catalytic converter (31), a secondary catalytic converter (32) and a tertiary catalytic converter (33); the soot blowing mechanism (5) includes a first soot blowing mechanism (51), a second soot blowing mechanism (52) and a third soot blowing mechanism (53). The first soot blowing mechanism (51), the second soot blowing mechanism (52) and the third soot blowing mechanism (53) are respectively arranged above the primary catalytic converter (31), the secondary catalytic converter (32) and the tertiary catalytic converter (33).

5. The industrial furnace flue gas denitration and heat recovery device according to claim 4, wherein, The first soot blowing mechanism (51), the second soot blowing mechanism (52) and the third soot blowing mechanism (53) all include a first jetting device (501), a second jetting device (502) and a third jetting device (503). The first jetting device (501), the second jetting device (502) and the third jetting device (503) are arranged in rows above the multi-stage catalytic converter (3).

6. The industrial furnace flue gas denitration and heat recovery device according to claim 5, wherein The first jet device (501), the second jet device (502), and the third jet device (503) each include a telescopic rod (5011), a main nozzle (5012), a sub-nozzle (5013), and a plurality of nozzles (5014) provided on the sub-nozzle (5013). The telescopic rod (5011) is provided on the outer wall surface of the denitration reactor (1) through a mounting frame (5015); the main nozzle (5012) is connected to the output end of the telescopic rod (5011) and is located inside the denitration reactor (1). The sub-nozzles (5013) are uniformly distributed along the axial direction and communicated with both sides of the main nozzle (5012).

7. The industrial furnace flue gas denitration and heat recovery device according to claim 6, characterized in that, The primary catalytic converter (31), the secondary catalytic converter (32), and the tertiary catalytic converter (33) are provided inside the denitration reactor (1) through a sliding frame (10). Screw lifting mechanisms (8) are threadedly connected to both sides of the sliding frame (10); the ends of the second soot blowing mechanism (52) and the third soot blowing mechanism (53) are engaged with the sliding frame (10) through a flipping mechanism (9), so that the second soot blowing mechanism (52) and the third soot blowing mechanism (53) can be flip-mounted inside the denitration reactor (1).

8. The industrial furnace flue gas denitration and heat recovery device according to claim 7, characterized in that, The flipping mechanism (9) includes a sliding sleeve (91), a polygonal rod (92), a turntable (93), and a rotating tooth (94). The sliding sleeve (91) is fixedly connected to the end of the main nozzle (5012). The polygonal rod (92) is rotatably provided on the inner wall of the denitration reactor (1) through a bearing. The sliding sleeve (91) is slidably sleeved on the polygonal rod (92). The turntable (93) and the rotating tooth (94) are provided at one end of the polygonal rod (92). One end of the sliding frame (10) is provided with a plurality of push rods (101). First racks (102) and second racks (103) are provided at intervals on the push rods (101). The sliding frame (10) makes the first rack (102) and the second rack (103) respectively engage and drive with the rotating tooth (94) through a lifting movement.

9. The industrial furnace flue gas denitration and heat recovery device according to claim 8, characterized in that, A fixing groove (104) is axially provided on one side of the push rod (101). A first access groove (105) and a second access groove (106) are also provided on the push rod (101). The first access groove (105) and the second access groove (106) communicate with the fixing groove (104); a first protrusion (95) and a second protrusion (96) are provided on the turntable (93). The turntable (93) rotates to make the first protrusion (95) enter the fixing groove (104) through the first access groove (105), and the second protrusion (96) enter the fixing groove (104) through the second access groove (106).

10. The industrial furnace flue gas denitration and heat recovery device according to claim 9, characterized in that, The first rack (102) and the second rack (103) that cooperate with the first jet device (501) and the third jet device (503) on the second soot blowing mechanism (52), and the first jet device (501) and the third jet device (503) on the third soot blowing mechanism (53) are respectively arranged opposite to each other.

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