Pulverized coal fired boiler flue gas denitration device adopting gas fuel

Abstract

The invention relates to the technical field of boiler flue gas treatment, in particular to a pulverized coal fired boiler flue gas denitration device adopting gas fuel, which comprises a flue gas collecting box, one side of the flue gas collecting box is fixedly connected with a sealing sleeve, and a catalysis mechanism is arranged in the sealing sleeve. Flue gas and ammonia mixed gas in the flue gas mixing box is introduced into the flue gas inlet pipe, the catalysis pipe and the flue gas outlet pipe through the flue gas inlets, the flue gas catalysis amounts of all the groups of catalysis mechanisms are different through different calibers of the flue gas inlets, and a reduction reaction between nitric oxide in flue gas and ammonia gas is accelerated through a catalyst in the catalysis pipe; the catalytic time is prolonged through the threaded structure of the catalytic tube, the problem that the reaction efficiency is remarkably reduced after the catalyst is poisoned is effectively avoided through the arrangement of the structure, the effect of detoxifying the catalyst can be achieved, meanwhile, the reaction time is prolonged, and the service life of the catalyst is prolonged; and the corresponding denitration cost can be reduced in the actual use process.

Description

Technical Field

[0001] The invention relates to the technical field of boiler flue gas treatment, and in particular to a flue gas denitration device for a pulverized coal boiler using fuel gas. Background Art

[0002] Boiler flue gas denitrification (denitrification) technology is mainly to reduce the emission of nitrogen oxides produced during boiler combustion, prevent air pollution and improve environmental quality. Nitrogen oxides mainly include nitric oxide and nitrogen dioxide, which are harmful gases produced during the combustion process and can cause acid rain, photochemical smog, air pollution and health problems.

[0003] In the document (publication number: CN117046276B), a desulfurization and denitrification system and process for coking flue gas is disclosed. The device can automatically replace the catalyst without stopping the flue gas into the flue gas mixing box, ensuring the efficiency of flue gas denitrification, and can also automatically replace the catalyst at the first time, ensuring the effect of flue gas denitrification. However, in actual use, the device cannot effectively extend the life of the catalyst used, which will cause the catalyst to be replaced immediately after poisoning, and cannot reduce the denitrification cost. At the same time, it is also impossible to deal with the dust collected in the bag in time. Since the dust in the bag needs to be cleaned after the bag has been used to remove dust for a long time, the flue gas needs to be stopped during cleaning, which reduces the processing efficiency of the device. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a pulverized coal boiler flue gas denitrification device using fuel gas.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A flue gas denitration device for a pulverized coal boiler using gas fuel, comprising a smoke collecting box, a sealing sleeve fixedly connected to one side of the smoke collecting box, a catalytic mechanism arranged inside the sealing sleeve, the catalytic mechanism comprising a servo motor, a smoke inlet, a receiving plate, a butt joint plate, a smoke inlet pipe, a catalytic tube, a second fixed plate, a smoke exhaust hole, a rotating rod and a smoke outlet pipe, the servo motor is fixedly connected to the smoke collecting box, the output shaft of the servo motor is fixedly connected to the rotating rod, the rotating rod is rotatably connected to the smoke collecting box, the rotating rod is fixedly connected to the second fixed plate, the second fixed plate is fixedly connected to the smoke outlet pipe, the smoke outlet pipe is fixedly connected to the catalytic tube, the catalytic tube is fixedly connected to the smoke inlet pipe, the smoke inlet pipe is fixedly connected to the butt joint plate, the butt joint plate is fixedly connected to the rotating rod, the butt joint plate fits the receiving plate, and the receiving plate is fixedly connected to the smoke inlet;

[0007] A mixed smoke box is fixedly connected to one side of the sealing sleeve, and an ash removal mechanism is provided on one side of the mixed smoke box, wherein the ash removal mechanism includes an ash removal box, an oxygen supply pipe, an air valve, a one-way valve, a reflux pipe, an ash removal net, an ash partition box, an air outlet and a baffle. The ash removal net is fixedly connected to the smoke inlet pipe, the ash removal box is fixedly connected to the mixed smoke box, the ash partition box is fixedly connected to the ash removal box, the baffle is fixedly connected to the ash partition box, the reflux pipe is fixedly connected to the ash removal box, the reflux pipe is fixedly connected to the one-way valve, the reflux pipe and the air outlet are located on the same horizontal plane, the oxygen supply pipe is fixedly connected to the smoke collecting box, and the air valve is fixedly connected to the oxygen supply pipe.

[0008] Furthermore, burners are fixedly installed on both sides of the mixed smoke box, an output head is fixedly installed on one side of the burner, the output head is fitted with the inner wall of the mixed smoke box, and two groups of fixed blocks 1 are fixedly connected inside the mixed smoke box, and the two groups of fixed blocks 1 are located on the same horizontal plane.

[0009] Furthermore, an ammonia delivery pipe is fixedly installed on one side of the smoke mixing box, one end of the ammonia delivery pipe is fixedly connected to a fixing plate 1, a plurality of groups of nozzles are fixedly installed on the lower surface of the fixing plate 1, and a fixing block 2 is fixedly connected inside the smoke mixing box.

[0010] Furthermore, a smoke inlet pipe is fixedly connected to the surface of the smoke mixing box, and a flange 1 is fixedly installed at one end of the smoke inlet pipe.

[0011] Furthermore, two groups of fixing blocks three are fixedly connected inside the dust removal box, the two groups of fixing blocks three are located in the same horizontal plane, and a dust collecting box is attached to one side of the fixing block three.

[0012] Furthermore, a connecting rod is fixedly connected to the upper surface of the ash collecting box, and an upper end of the connecting rod is fixedly connected to a limiting block.

[0013] Furthermore, both sides of the ash collecting box are provided with reserved grooves, inner walls of the reserved grooves are fitted with clamping blocks, one side of the clamping block is fixedly connected with a sliding block, and the sliding block is slidably connected to the fixed block.

[0014] Furthermore, a spring is fixedly connected to one side of the sliding block, and the spring is fixedly connected to the fixing block three.

[0015] Furthermore, a smoke exhaust pipe is fixedly connected to the surface of the smoke collecting box, and a flange 2 is fixedly installed at one end of the smoke exhaust pipe.

[0016] Furthermore, a push block is fixedly mounted on the lower surface of the sliding block, and the push block is three-fitted with the fixed block.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention passes the smoke and ammonia mixed gas in the smoke mixing box into the smoke inlet, the catalytic tube and the smoke outlet through the smoke inlet. The different diameters of the smoke inlet make the smoke catalytic amount of each group of catalytic mechanisms different. The catalyst in the catalytic tube accelerates the reduction reaction between nitrogen oxides in the smoke and ammonia. The threaded structure of the catalytic tube prolongs the catalytic time, making the smoke and ammonia react more fully. After the reaction continues, the catalyst is poisoned, which reduces the reaction efficiency. The servo motor is started, and the servo motor drives the rotating rod to rotate counterclockwise, so that the fixed plate 2, the smoke outlet, the catalytic tube, the smoke inlet and the docking plate rotate with the rotating rod, so that the smoke inlet and the smoke inlet gradually move away from each other, so that the smoke inlet with the smallest diameter is The smoke inlet pipe corresponding to the smoke outlet is at the same level as the oxygen supply pipe, and oxygen is introduced into the interior of the catalytic tube through the oxygen supply pipe and the gas valve, so that the catalyst inside the catalytic tube undergoes a high-temperature oxidation reaction, and the sulfides deposited on the surface are oxidized, thereby detoxifying the catalyst. The rotating rod is rotated so that the catalytic mechanism that was previously at the same level as the oxygen supply pipe is at the same level as the smoke inlet with the largest diameter, thereby completing the rotation of the catalytic tube. The setting of this structure effectively avoids the problem of significantly reduced reaction efficiency after the catalyst is poisoned, and can achieve the effect of detoxifying the catalyst. At the same time, it prolongs the reaction time, increases the service life of the catalyst, and can also reduce the corresponding denitrification cost during actual use.

[0019] 2. The present invention filters the dust in the flue gas through the ash removal net arranged inside the smoke inlet pipe, so that the dust is deposited on the surface of the ash removal net. When the catalyst is detoxified, the dust on the surface of the ash removal net can be backblown through the introduction of oxygen in the oxygen supply pipe, so that the dust is separated from the surface of the ash removal net and enters the interior of the ash removal box together with the gas after the reaction in the catalytic tube. The gas flow direction is first downward and then upward through the baffle, and the dust falls on the surface of the limit block and the fixed block three through gravity. The gas is re-entered into the interior of the mixed smoke box through the one-way valve and the reflux pipe. The arrangement of this structure effectively avoids the problem of manual cleaning of the dust on the surface of the ash removal net after a long period of reaction in the device, and can achieve the effect of simultaneous cleaning in the process of detoxifying the catalyst. At the same time, it avoids the influence of dust on the denitration reaction, improves the denitration effect of the device, and reduces the corresponding cleaning cost.

[0020] The dust collecting box is limited by the card block, and the setting of this structure effectively avoids the problem of stopping exhaust when cleaning, and can achieve the effect of not affecting flue gas denitrification by processing dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 The present invention Figure 1 A schematic diagram of a front cross-sectional structure;

[0023] Figure 3 The present invention Figure 1 A schematic diagram of the left-view structure of the embodiment;

[0024] Figure 4 The present invention Figure 3 A schematic diagram of the internal structure from the front;

[0025] Figure 5 The present invention Figure 4 Schematic diagram of the left-view local structure;

[0026] Figure 6 The present invention Figure 3 A schematic diagram of the structure of the upper part;

[0027] Figure 7 The present invention Figure 6 Schematic diagram of the rear view structure.

[0028] Reference numerals: 1, smoke mixing box; 11, flange 1; 12, smoke inlet pipe; 13, smoke exhaust pipe; 14, flange 2; 15, smoke collecting box; 16, sealing sleeve; 2, fixing plate 1; 21, ammonia delivery pipe; 22, nozzle; 23, burner; 24, fixing block 1; 25, fixing block 2; 26, output head; 3, catalytic mechanism; 31, servo motor; 32, smoke inlet; 33, receiving plate; 34, docking plate; 35, smoke inlet pipe; 36, catalytic tube; 37 , fixed plate two; 38, smoke exhaust hole; 39, rotating rod; 310, smoke outlet pipe; 4, ash removal mechanism; 41, ash removal box; 42, oxygen supply pipe; 43, air valve; 44, one-way valve; 45, return pipe; 46, ash removal net; 47, ash partition box; 48, air outlet; 49, baffle; 5, fixed block three; 51, push block; 52, ash collection box; 53, reserved slot; 54, limit block; 55, connecting rod; 56, block; 57, slider; 58, spring. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] Embodiment 1, as Figure 1-Figure 7 As shown, a flue gas denitrification device for a pulverized coal boiler using gas fuel includes a smoke collecting box 15, a sealing sleeve 16 is fixedly connected to one side of the smoke collecting box 15, a catalytic mechanism 3 is arranged inside the sealing sleeve 16, and the catalytic mechanism 3 includes a servo motor 31, a smoke inlet 32, a receiving plate 33, a docking plate 34, a smoke inlet pipe 35, a catalytic tube 36, a second fixing plate 37, a smoke exhaust hole 38, a rotating rod 39 and a smoke outlet pipe 310, the servo motor 31 is fixedly connected to the smoke collecting box 15, and the servo motor 31 The output shaft is fixedly connected to the rotating rod 39, the rotating rod 39 is rotatably connected to the smoke collecting box 15, the rotating rod 39 is fixedly connected to the second fixing plate 37, the second fixing plate 37 is fixedly connected to the smoke outlet pipe 310, the smoke outlet pipe 310 is fixedly connected to the catalytic tube 36, the catalytic tube 36 is fixedly connected to the smoke inlet pipe 35, the smoke inlet pipe 35 is fixedly connected to the docking plate 34, the docking plate 34 is fixedly connected to the rotating rod 39, the docking plate 34 is fitted with the receiving plate 33, and the receiving plate 33 is fixedly connected to the smoke inlet 32;

[0031] A mixed smoke box 1 is fixedly connected to one side of the sealing sleeve 16, and an ash removal mechanism 4 is provided on one side of the mixed smoke box 1. The ash removal mechanism 4 includes an ash removal box 41, an oxygen supply pipe 42, an air valve 43, a one-way valve 44, a return pipe 45, an ash removal net 46, an ash partition box 47, an air outlet 48 and a baffle 49. The ash removal net 46 is fixedly connected to the smoke inlet pipe 35, the ash removal box 41 is fixedly connected to the mixed smoke box 1, the ash partition box 47 is fixedly connected to the ash removal box 41, the baffle 49 is fixedly connected to the ash partition box 47, the return pipe 45 is fixedly connected to the ash removal box 41, the return pipe 45 is fixedly connected to the one-way valve 44, the return pipe 45 and the air outlet 48 are located at the same horizontal plane, the oxygen supply pipe 42 is fixedly connected to the smoke collecting box 15, and the air valve 43 is fixedly connected to the oxygen supply pipe 42.

[0032] When the flue gas is subjected to denitration treatment, the smoke and ammonia mixed gas in the smoke mixing box 1 is introduced into the inside of the smoke inlet 35, the catalytic tube 36 and the smoke outlet 310 through the smoke inlet 32. The different diameters of the smoke inlet 32 ​​make the catalytic amount of the flue gas of each group of catalytic mechanisms 3 different. The catalyst in the catalytic tube 36 accelerates the reduction reaction of nitrogen oxides in the flue gas with ammonia. The threaded structure of the catalytic tube 36 prolongs the catalytic time, so that the reaction between the flue gas and ammonia is more complete. As the reaction continues, the catalyst is poisoned. , which reduces the reaction efficiency, starts the servo motor 31, and drives the rotating rod 39 to rotate counterclockwise through the servo motor 31, so that the fixed plate 37, the smoke outlet pipe 310, the catalytic tube 36, the smoke inlet pipe 35 and the docking plate 34 rotate along with the rotating rod 39, so that the smoke inlet pipe 35 and the smoke inlet port 32 gradually move away from each other, so that the smoke inlet pipe 35 corresponding to the smoke inlet port 32 with the smallest diameter is at the same horizontal plane with the oxygen supply pipe 42, and oxygen is introduced into the interior of the catalytic tube 36 through the oxygen supply pipe 42 and the gas valve 43, so that the catalytic tube The catalyst inside the 36 undergoes a high-temperature oxidation reaction, so that the sulfide and the like deposited on its surface are oxidized, thereby detoxifying the catalyst. The rotating rod 39 is rotated so that the catalytic mechanism 3, which was previously at the same level as the oxygen supply pipe 42, is at the same level as the smoke inlet 32 ​​with the largest diameter, thereby completing the rotation of the catalytic tube 36. In the process of denitrification using the catalyst, the dust in the flue gas is filtered through the dust removal net 46 provided inside the smoke inlet pipe 35, so that the dust is deposited on the surface of the dust removal net 46. When the catalyst is detoxified, the dust on the surface of the ash removal net 46 can be backblown through the introduction of oxygen in the oxygen supply pipe 42, so that the dust is separated from the surface of the ash removal net 46 and enters the interior of the ash removal box 41 together with the gas after the reaction in the catalytic tube 36. The baffle 49 makes the gas flow downward first and then upward. The dust falls on the surface of the limit block 54 and the fixed block 5 due to gravity. The gas re-enters the interior of the mixed smoke box 1 through the one-way valve 44 and the reflux pipe 45, and re-enters along with the non-denitrified flue gas.

[0033] Embodiment 2, as Figure 2As shown, on the basis of the above embodiment, it also includes that burners 23 are fixedly installed on both sides of the mixed smoke box 1, and an output head 26 is fixedly installed on one side of the burner 23. The output head 26 is in contact with the inner wall of the mixed smoke box 1. Two groups of fixed blocks 24 are fixedly connected to the inside of the mixed smoke box 1. The two groups of fixed blocks 24 are located in the same horizontal plane. The boiler flue gas is guided by the fixed blocks 24 so that the flue gas passes through the highest flame temperature of the output head 26, so that the flue gas reaches the optimal reaction temperature, thereby improving the denitrification effect of the device.

[0034] Embodiment three, as Figure 2 As shown, on the basis of the above embodiment, it also includes that an ammonia delivery pipe 21 is fixedly installed on one side of the mixed smoke box 1, one end of the ammonia delivery pipe 21 is fixedly connected to a fixed plate 2, a plurality of groups of nozzles 22 are fixedly installed on the lower surface of the fixed plate 2, and a fixed block 25 is fixedly connected to the inside of the mixed smoke box 1, the ammonia water sprayed from the nozzle 22 is vaporized through the output head 26, and the flue gas is guided through the fixed block 25 so that the flue gas, ammonia and water vapor are fully mixed, thereby improving the denitrification effect of the device.

[0035] Embodiment 4, as Figure 1 As shown, on the basis of the above embodiment, it also includes that a smoke inlet pipe 12 is fixedly connected to the surface of the mixed smoke box 1, and a flange 11 is fixedly installed at one end of the smoke inlet pipe 12. The smoke inlet pipe 12 and the flange 11 make it easy to connect the device with the rear flue, thereby reducing the difficulty of installation and the corresponding installation time.

[0036] Embodiment 5, as Figure 6 As shown, on the basis of the above embodiment, it also includes that the dust removal box 41 is fixedly connected to the inside with two groups of fixed blocks three 5, the two groups of fixed blocks three 5 are located in the same horizontal plane, and one side of the fixed block three 5 is attached to the dust collecting box 52. Since the upper surface of the fixed block three 5 is an inclined surface, the dust gradually falls into the interior of the dust collecting box 52 through the action of gravity. At the same time, the fixed block three 5 is tightly attached to the dust collecting box 52 to prevent leakage of harmful gases.

[0037] Embodiment six, as Figure 7 As shown, on the basis of the above embodiment, it also includes that the upper surface of the ash collecting box 52 is fixedly connected with a connecting rod 55, and the upper end of the connecting rod 55 is fixedly connected to a limiting block 54. When the dust inside the ash collecting box 52 is cleaned, the limiting block 54 fits with the upper surface of the fixed block 5, so that the lower surface of the ash removal box 41 is in a sealed state after being opened for a short time, thereby avoiding a large amount of harmful gas leakage when the dust inside the ash collecting box 52 is cleaned.

[0038] Embodiment seven, as Figure 6 , Figure 7As shown, on the basis of the above embodiment, it also includes that reserved grooves 53 are opened on both sides of the ash collecting box 52, and the inner wall of the reserved groove 53 is fitted with a clamping block 56, and a slider 57 is fixedly connected to one side of the clamping block 56. The slider 57 is slidably connected to the fixed block 5, and the ash collecting box 52 is limited by the clamping block 56, thereby improving the stability of the ash collecting box 52 when in use.

[0039] Embodiment eight, as Figure 6 , Figure 7 As shown, on the basis of the above embodiment, it also includes that a spring 58 is fixedly connected to one side of the slider 57, and the spring 58 is fixedly connected to the fixed block 3 5. The elastic force of the spring 58 prevents the slider 57 from being offset, thereby improving the safety of the denitration device.

[0040] Embodiment 9, as Figure 1 As shown, on the basis of the above embodiment, it also includes that the surface of the smoke collecting box 15 is fixedly connected with a smoke exhaust pipe 13, and one end of the smoke exhaust pipe 13 is fixedly installed with a flange 2 14. The smoke exhaust pipe 13 and the flange 2 14 facilitate the connection of the device with the subsequent desulfurization device, thereby improving the convenience of disassembly and assembly of the device.

[0041] Embodiment ten, as Figure 6 , Figure 7 As shown, on the basis of the above embodiment, it also includes that a push block 51 is fixedly installed on the lower surface of the sliding block 57, and the push block 51 is in contact with the fixed block 5. The push block 51 is convenient for the staff to disassemble and assemble the dust collecting box 52, thereby improving the efficiency of dust cleaning.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue gas denitrification device for a pulverized coal boiler using gas fuel, comprising a smoke collecting box (15), characterized in that: A sealing sleeve (16) is fixedly connected to one side of the smoke collecting box (15), and a catalytic mechanism (3) is arranged inside the sealing sleeve (16). The catalytic mechanism (3) comprises a servo motor (31), a smoke inlet (32), a receiving plate (33), a docking plate (34), a smoke inlet pipe (35), a catalytic tube (36), a second fixing plate (37), a smoke exhaust hole (38), a rotating rod (39) and a smoke outlet pipe (310). The servo motor (31) is fixedly connected to the smoke collecting box (15), and the output shaft of the servo motor (31) is fixedly connected to the rotating rod (39). The rod (39) is rotatably connected to the smoke collecting box (15), the rotating rod (39) is fixedly connected to the second fixing plate (37), the second fixing plate (37) is fixedly connected to the smoke outlet pipe (310), the smoke outlet pipe (310) is fixedly connected to the catalytic tube (36), the catalytic tube (36) is fixedly connected to the smoke inlet pipe (35), the smoke inlet pipe (35) is fixedly connected to the docking plate (34), the docking plate (34) is fixedly connected to the rotating rod (39), the docking plate (34) is fitted with the receiving plate (33), and the receiving plate (33) is fixedly connected to the smoke inlet (32); A smoke mixing box (1) is fixedly connected to one side of the sealing sleeve (16), and an ash removal mechanism (4) is provided on one side of the smoke mixing box (1). The ash removal mechanism (4) comprises an ash removal box (41), an oxygen supply pipe (42), an air valve (43), a one-way valve (44), a return pipe (45), an ash removal net (46), an ash partition box (47), an air outlet (48) and a baffle (49). The ash removal net (46) is fixedly connected to the smoke inlet pipe (35), and the ash removal box (41) is fixedly connected to the smoke mixing box (35). (1) fixedly connected, the ash partition box (47) is fixedly connected to the ash removal box (41), the baffle (49) is fixedly connected to the ash partition box (47), the return pipe (45) is fixedly connected to the ash removal box (41), the return pipe (45) is fixedly connected to the one-way valve (44), the return pipe (45) and the air outlet (48) are located on the same horizontal plane, the oxygen supply pipe (42) is fixedly connected to the smoke collection box (15), and the air valve (43) is fixedly connected to the oxygen supply pipe (42).

2. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that: Burners (23) are fixedly mounted on both sides of the mixed smoke box (1), an output head (26) is fixedly mounted on one side of the burner (23), the output head (26) is in contact with the inner wall of the mixed smoke box (1), and two groups of fixed blocks (24) are fixedly connected inside the mixed smoke box (1), and the two groups of fixed blocks (24) are located on the same horizontal plane.

3. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that: An ammonia delivery pipe (21) is fixedly mounted on one side of the smoke mixing box (1), one end of the ammonia delivery pipe (21) is fixedly connected to a fixing plate 1 (2), a plurality of groups of nozzles (22) are fixedly mounted on the lower surface of the fixing plate 1 (2), and a fixing block 2 (25) is fixedly connected inside the smoke mixing box (1).

4. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that: A smoke inlet pipe (12) is fixedly connected to the surface of the smoke mixing box (1), and a flange 1 (11) is fixedly mounted on one end of the smoke inlet pipe (12).

5. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that: Two groups of fixing blocks three (5) are fixedly connected inside the dust removal box (41), and the two groups of fixing blocks three (5) are located on the same horizontal plane. A dust collecting box (52) is attached to one side of the fixing block three (5).

6. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 5, characterized in that: A connecting rod (55) is fixedly connected to the upper surface of the ash collecting box (52), and the upper end of the connecting rod (55) is fixedly connected to a limiting block (54).

7. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 5, characterized in that: Both sides of the ash collecting box (52) are provided with reserved grooves (53), the inner wall of the reserved groove (53) is fitted with a clamping block (56), one side of the clamping block (56) is fixedly connected with a sliding block (57), and the sliding block (57) is slidably connected to the fixed block three (5).

8. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 7, characterized in that: A spring (58) is fixedly connected to one side of the sliding block (57), and the spring (58) is fixedly connected to the fixed block three (5).

9. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 1, characterized in that: A smoke exhaust pipe (13) is fixedly connected to the surface of the smoke collecting box (15), and a second flange (14) is fixedly installed at one end of the smoke exhaust pipe (13).

10. The flue gas denitrification device for a pulverized coal boiler using gas fuel according to claim 7, characterized in that: A push block (51) is fixedly mounted on the lower surface of the sliding block (57), and the push block (51) is in contact with the fixed block three (5).

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