An air distribution collaborative SNCR spray gun layout device for a reverse reciprocating waste incineration boiler

Abstract

The present invention relates to the technical field of SNCR denitration equipment, and particularly relates to a reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device. The device includes a furnace chamber, a flue arranged in the furnace chamber for flue gas to flow through, a grate arranged inside the furnace chamber and at the bottom of the furnace chamber, an ash hopper is arranged below the grate, a primary air supply system is arranged below the ash hopper, a secondary air supply system is arranged above the grate, and further includes an SNCR spray gun assembly arranged inside the flue. The SNCR spray gun assembly includes a spray gun main pipe and multiple layers of spray gun layers arranged downward in sequence on the spray gun main pipe. A position control unit for controlling the up and down movement of the SNCR spray gun assembly is arranged at the top of the furnace chamber, and a detection unit for detecting the environment of the SNCR spray gun assembly and controlling the opening and closing of the position control unit is arranged in the middle of the flue. The device is provided with a spray gun assembly that can move up and down in the flue, which can help the flue gas and the reducing agent solution to be mixed in all directions, improve the denitration efficiency of the flue gas, and achieve a better flue gas reduction treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of SNCR denitration equipment, and particularly relates to an air distribution cooperative SNCR spray gun arrangement device for a reverse-pushing reciprocating waste incineration boiler. Background Art

[0002] With the development of cities, the amount of domestic waste generated by people in their daily lives is increasing. How to deal with domestic waste is an urgent problem to be solved. The incineration method not only has high efficiency in treating waste but also realizes waste utilization. It is the mainstream way to comprehensively treat combustible solid waste in cities. Subsequently, research on incineration equipment has begun to be widely discussed and concerned. For example, the Chinese patent with the application number CN201820657161.1 discloses "a waste incinerator", which is equipped with a primary air system and a secondary air system to transport the air required for combustion in the furnace body. To a certain extent, it can ensure a relatively fast combustion rate, a high burnout rate, and a high organic matter decomposition rate.

[0003] However, with the continuous expansion of the scale of waste incineration treatment, the output of NOx pollutants is more than before. Currently, using SNCR denitration technology to remove NOx is the mainstream way for waste incineration boilers to remove NOx. The SNCR denitration technology, namely Selective Non-Catalytic Reduction technology, is a clean denitration technology that does not use a catalyst and sprays a reducing agent containing amino groups (such as ammonia water, urea solution, etc.) into the furnace within the temperature range of 850 - 1100°C to reduce and remove NOx in the flue gas, generating nitrogen and water.

[0004] The Chinese patent with the application number CN202121099258.3 discloses "a waste incinerator denitration and dust removal system", which adds a reducing agent injection point on the flue duct. The injection point is fixed on the flue duct wall, and the injection distance is relatively short, which will result in only the flue gas at the top of the flue duct being able to mix with the reducing agent, and the flue gas in the middle and lower parts of the flue duct not being covered by the reducing agent, so the NOx in the flue gas cannot be reduced and is discharged into the atmosphere with the flue gas, resulting in a low NOx removal rate.

[0005] The Chinese patent with the application number CN202221584042.0 discloses "a flue duct dynamic air distribution cooperative SNCR denitration control device". The most significant feature of this device is that it adds an SNCR denitration control system on the basis of the previous incinerator to achieve flue gas denitration. However, the water content of waste varies throughout the year, resulting in changes in the intake air volume of its air distribution system when adapting to different waste water contents. The change in air volume will affect the flow velocity and temperature of the flue gas in the flue duct, while the position of the denitration control system remains fixed, leading to a decline in the mixing effect of the flue gas and the reducing agent during the denitration process.

[0006] Therefore, how to further improve the denitration efficiency of the SNCR denitration system, maximize the combination of flue gas and reducing agent, and reduce the emission of nitrogen oxides is still an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0007] The present invention aims to overcome the defect in the prior art that the flue gas in the SNCR denitration system cannot be fully reduced during the denitration process, and provides a reverse-push reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device to overcome the above defect.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A reverse-push reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device includes a furnace, a flue for flue gas to flow through arranged in the furnace, a grate arranged inside the furnace and at the bottom of the furnace, an ash hopper arranged below the grate, a primary air supply system arranged below the ash hopper, a secondary air supply system arranged above the grate, and an SNCR spray gun assembly arranged inside the flue. The SNCR spray gun assembly includes a spray gun main pipe and multiple layers of spray gun layers arranged downward in sequence on the spray gun main pipe. A position control unit for controlling the up and down movement of the SNCR spray gun assembly is arranged at the top of the furnace, and a detection unit for detecting the environment of the SNCR spray gun assembly and controlling the opening and closing of the position control unit is arranged in the middle of the flue.

[0010] The garbage generated in production and life is usually post-treated by means such as landfilling, incineration, and composting. The incineration method is widely used in current garbage treatment, and its advantage lies in good reduction effect and thorough treatment. The reverse-push reciprocating waste incineration boiler designed by the present invention is different from the existing technology in that the spray gun assembly used for denitration is not fixed on the flue wall, but is a spray gun assembly suspended in the flue and capable of moving up and down.

[0011] In the existing waste incinerator, the position of the SNCR spray gun is fixed, so the problem that the flue gas cannot be fully reduced easily occurs; while the SNCR spray gun assembly can move up and down in the flue and is provided with multiple layers of spray gun layers, which can ensure the all-round mixing of the reducing agent and the flue gas, and thus the effect in the flue gas denitration treatment is remarkable.

[0012] It should be noted that the water content of garbage varies throughout the year and changes with the seasons. When the water content of garbage changes, the flow rate and temperature of the flue gas in the furnace also change accordingly. The detection unit monitors the changes in the temperature and speed of the flue gas in the flue, and then transmits the information to the position control unit, causing the SNCR spray gun assembly to start moving up and down to maintain the optimal denitration state.

[0013] Preferably, the position control unit includes a hydraulic sensor and a computer for issuing instructions to the hydraulic sensor; the detection unit includes a temperature sensor and a speed sensor.

[0014] Preferably, the spray gun layer is an annular object, and a plurality of nozzle in the shape of a shower are annularly arranged on both its inner and outer circles.

[0015] Considering the sufficient mixing of the reducing agent solution and the flue gas, multiple nozzles are provided for each layer of spray gun. Among them, the nozzles are designed in the shape of a shower. When the reducing agent solution is ejected from the nozzles, the shape of the shower can make the reducing agent spray out in all directions, maximizing the contact area between the reducing agent solution and the flue gas, so as to achieve a better flue gas reduction treatment effect. In addition, the position design of the nozzles on the spray gun can be considered to be evenly annularly arranged on the spray gun, or a non-uniform spacing design can be made. Or, on the spray guns of odd-numbered layers, the next nozzle is added in a way of gradually increasing the spacing, and on the spray guns of even-numbered layers, the next nozzle is added in a way of gradually decreasing the spacing. At the same time, the nozzles on the inner and outer circles can be symmetrically arranged or staggeredly arranged. Finally, the design that can achieve the sufficient mixing state of the reducing agent solution and the flue gas is appropriate.

[0016] However, in actual production applications, it is usually designed with a relatively appropriate spacing, and multiple nozzles are evenly arranged on the spray gun at this spacing. In this way, both the requirement of sufficient mixing can be achieved, and the best effect can be achieved with the least number of nozzles. Considering the production cost, such a design has a wider scope of application.

[0017] Preferably, the primary air supply system includes a primary air main pipe, which is a hollow pipe with one end open. It is horizontally arranged below the ash hopper, and a primary air pipe is connected to one side facing the ash hopper. The primary air pipe extends upward to communicate with the ash hopper, and the open end of the primary air main pipe is connected to a primary air blower.

[0018] The computer can adjust the rotational speed of the primary air blower by controlling the frequency converter controller of the blower, so as to control the air output of the primary air blower. The primary air blower is put into automatic operation under the control of the DSC automation system, and conveys air to the primary air main pipe. The air enters the primary air pipe from the primary air main pipe, then goes to the ash hopper and blows towards the grate, and finally is transmitted into the furnace. The air conveyed into the furnace by the primary air blower can help increase the oxygen required for garbage combustion, so that the garbage can be fully burned; in addition, the air conveyed from the bottom to the top by the primary air pipe can provide a thrust to the garbage, causing the garbage to turn to a certain extent, which is beneficial to the full combustion of the garbage.

[0019] Preferably, a primary air preheater is additionally provided between the primary air blower and the primary air main pipe.

[0020] The air preheater is provided with heating auxiliary structures such as heating resistors. When the primary air fan conveys air to the primary air main pipe, the air can be heated, and the air is heated to 200 - 300 °C and then conveyed into the furnace. The heated high-temperature air can accelerate the evaporation of moisture in the garbage, enabling the garbage to reach the ignition point faster.

[0021] Preferably, the secondary air supply system includes a secondary air main pipe. The secondary air main pipe includes a main pipe and a plurality of branch pipes. One end of the main pipe is connected to a secondary air fan, and the other end converges a plurality of branch pipes. Each branch pipe is connected to a secondary air duct at the end far from the main pipe. The secondary air duct is attached to the inner wall of the furnace, and the secondary air duct is inclined downward.

[0022] One branch pipe is correspondingly provided for each secondary air duct to convey air to each secondary air duct at a fixed point.

[0023] The computer can adjust the rotation speed of the secondary air fan by controlling the frequency converter controller of the fan, thereby controlling the air output volume of the secondary air fan. The secondary air fan is put into automatic operation under the control of the DSC automation system, conveying air to the secondary air main pipe. The air enters the secondary air duct from the secondary air main pipe and is finally conveyed into the furnace. The secondary air duct brings a large amount of oxygen to the incinerator, which plays a crucial role in whether the combustible components can burn completely. At the same time, the secondary air is injected into the incinerator at a high speed, enhancing the turbulence intensity in the incinerator and having a great effect on the disturbance of the flue gas in the furnace. In this way, the residence time of the flue gas can be extended, thereby reducing the emission of dioxins in the flue gas and affecting the generation of NOx. It can also make the distribution of the high-temperature area in the incinerator more uniform and reduce the probability of large temperature deviation.

[0024] In addition, the secondary air duct is inclined downward, which can ensure that the ejected air is concentrated in the middle of the furnace, that is, the concentrated treatment part of the garbage combustion.

[0025] The number and position of the secondary air ducts should ensure that the ejected air fills the furnace above the grate. Thus, it can be ensured that the garbage can be fully burned under the action of the air conveyed by the secondary air ducts.

[0026] Preferably, the secondary air duct extends into the furnace and is provided with a nozzle, and the air outlet end of the nozzle is connected to the furnace.

[0027] Preferably, the side wall of the nozzle is provided with spray holes.

[0028] Preferably, a secondary air preheater is additionally provided between the secondary air fan and the secondary air main pipe.

[0029] The air preheater is provided with heating auxiliary structures such as heating resistors. When the secondary air blower conveys air to the secondary air main pipe, the air can be heated, and the air is heated to 200 - 300 °C and then conveyed into the furnace. The heated high-temperature air can accelerate the evaporation of moisture in the garbage, enabling the garbage to reach the ignition point faster.

[0030] The water content of the garbage varies throughout the year and changes with the seasons. Considering this, it is necessary to adjust the flow rate and temperature of the primary air and the flow rate and temperature of the secondary air to meet the requirements of processing garbage with different water contents. In addition, changes in the air intake will lead to changes in the flow velocity of the flue gas in the flue and the temperature of the flue gas itself. Therefore, when the temperature sensor and speed sensor detect changes in the temperature and speed of the flue gas, the collected information will be transmitted to the hydraulic sensor, finally recorded in the computer, and then the computer will transmit instructions to the hydraulic sensor, and the hydraulic sensor will control the up and down movement of the spray gun assembly. This realizes the important function of this device to process garbage with different moisture contents.

[0031] Preferably, the side of the grate in contact with the furnace is provided with spray holes.

[0032] The spray holes provided on the grate facilitate the conveyance of the air in the primary air pipe into the furnace.

[0033] Therefore, the present invention has the following beneficial effects:

[0034] (1) The reverse reciprocating waste incineration boiler air distribution and coordinated SNCR spray gun arrangement device designed by the present invention is provided with a spray gun assembly that can move up and down in the flue, which can help the flue gas and the reducing agent solution to be mixed comprehensively;

[0035] (2) The spray gun assembly designed by the present invention includes multiple layers of spray guns, which increases the contact area between the reducing agent solution sprayed out of the spray gun and the flue gas, thereby improving the denitrification efficiency of the flue gas;

[0036] (3) The multiple nozzles on the spray gun designed by the present invention are shower-shaped nozzles. The shape of the shower can make the reducing agent spray out in all directions, maximizing the contact area between the reducing agent solution and the flue gas, thereby achieving a better flue gas reduction treatment effect;

[0037] (4) The present invention is designed with multiple secondary air pipes on the inner wall of the furnace, which can ensure that the garbage can be supplemented with the most sufficient oxygen during the combustion process to assist combustion; the air flow conveyed by the secondary air pipes can form a rotating and turbulent aerodynamic field in the furnace, extending the residence time of the flue gas in the furnace, thereby making the combustion in the furnace more complete, and further making the combustion emissions meet the standard requirements. Description of the Drawings

[0038] Figure 1It is a partial structural schematic diagram of an air distribution collaborative SNCR spray gun layout device for a reverse reciprocating waste incineration boiler;

[0039] Figure 2 It is a structural schematic diagram of an air distribution collaborative SNCR spray gun layout device for a reverse reciprocating waste incineration boiler;

[0040] Figure 3 It is a schematic diagram of a single-layer SNCR spray gun;

[0041] Figure 4 It is a partial enlarged schematic diagram of the SNCR spray gun;

[0042] Figure 5 It is a process schematic diagram of an air distribution collaborative SNCR spray gun denitration control system.

[0043] The codes in the figure are respectively: furnace 100; flue 110; feed inlet 120; slag outlet 130; grate 200; ash hopper 210; primary air supply system 300; primary air main pipe 310; primary air pipe 311; primary air fan 320; primary air air preheater 330; secondary air supply system 400; secondary air main pipe 410; main pipe 411; branch pipe 412; secondary air pipe 413; spray pipe 413a; secondary air fan 420; secondary air air preheater 430; SNCR spray gun assembly 500; spray gun main pipe 510; spray gun layer 520; nozzle 521; position control unit 530; detection unit 540; temperature sensor 540a; speed sensor 540b. Specific embodiments

[0044] The present invention will be further described below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are usually only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0045] Such as Figure 1 And 2As shown in the figure, the present invention provides an embodiment of a reverse-push reciprocating waste incineration boiler air distribution and coordinated SNCR spray gun arrangement device, including a furnace 100, a flue 110 provided in the furnace 100 for flue gas circulation, a grate 200 provided inside the furnace 100 and located at the bottom of the furnace 100, and the side of the grate 200 in contact with the furnace 100 is provided with spray holes. There are 4 ash hoppers 210 provided below the grate 200, a primary air supply system 300 is provided below the 4 ash hoppers 210, a secondary air supply system 400 is provided above the grate 200, and it further includes an SNCR spray gun assembly 500 provided inside the flue 110. The SNCR spray gun assembly 500 includes a spray gun main pipe 510, and three layers of spray gun layers 520 arranged downward in sequence on the spray gun main pipe 510. Among them, the three layers of spray gun layers 520 are enlarged from top to bottom in sequence, and the spacing between each spray gun in each layer is the same. The spray gun main pipe 510 is connected to a hydraulic sensor (position control unit 530) provided at the top of the furnace 100, and the hydraulic sensor can control the up and down movement of the spray gun assembly in the flue 110. The SNCR spray gun assembly 500 can move up and down in the flue 110, which can ensure the all-round mixing of the reducing agent and the flue gas, and make the effect of flue gas denitrification treatment remarkable. A temperature sensor 540a and a speed sensor 540b are provided in the middle of the flue 110, which can be used to monitor the changes in the speed and temperature of the flue gas in the flue 110. Then the information is transmitted to the hydraulic sensor, and the computer connected to the hydraulic sensor issues an instruction to make the SNCR spray gun assembly 500 start to move up and down to maintain the best denitrification state.

[0046] The primary air supply system 300 includes a primary air main pipe 310. The primary air main pipe 310 is a hollow pipe with one end open, and it is horizontally arranged below the ash hopper 210. 16 primary air pipes 311 are vertically provided upward on the side of the primary air main pipe 310 facing the ash hopper 210. Among them, every 4 adjacent primary air pipes 311 are vertically connected to 1 ash hopper 210. One end of the open primary air main pipe 310 is connected to a primary air fan 320. A primary air air preheater 330 is provided between the primary air fan 320 and the primary air main pipe 310, and heating auxiliary structures such as heating resistors are provided inside the air preheater.

[0047] The computer can adjust the rotation speed of the primary air blower 320 by controlling the frequency converter controller of the blower, thereby controlling the air output volume of the primary air blower 320. The primary air blower 320 is put into automatic operation under the control of the DSC automation system, and conveys air to the primary air main pipe 310. The air enters the primary air duct 311 from the primary air main pipe 310, and then leads to the ash hopper 210 and blows towards the grate 200, and finally is transmitted into the furnace chamber 100. The air conveyed into the furnace chamber 100 by the primary air blower 320 can help increase the oxygen required for garbage combustion, enabling the garbage to burn fully; in addition, the air conveyed from the bottom to the top by the primary air duct 311 can provide a thrust to the garbage, causing the garbage to turn over to a certain extent, which is conducive to the full combustion of the garbage. At the same time, when the primary air blower 320 conveys air to the primary air main pipe 310, the air can be preheated by the air preheater first, and the air is heated to 200-300 °C and then transmitted into the furnace chamber 100. The heated high-temperature air can accelerate the evaporation of the moisture in the garbage, enabling the garbage to reach the ignition point faster.

[0048] The secondary air supply system 400 includes a secondary air main pipe 410. The secondary air main pipe 410 includes 1 main pipe 411 and 4 branch pipes 412. One end of the main pipe 411 is connected to a secondary air blower 420, and the other end converges 4 branch pipes 412. Each end of the branch pipe 412 away from the main pipe 411 is connected to a secondary air duct 413. The 4 secondary air ducts 413 are respectively arranged on the inner wall of the furnace chamber 100, and are all arranged obliquely downward along the furnace chamber 100, which can ensure that the ejected air is concentrated in the middle of the furnace chamber 100, that is, the concentrated treatment part of garbage combustion.

[0049] The secondary air duct 413 extends into the furnace chamber 100 and is provided with a nozzle 413a. The air outlet end of the nozzle 413a is connected to the furnace chamber 100. Spray holes are provided on the side wall of the nozzle 413a. A secondary air preheater 430 is additionally provided between the secondary air blower 420 and the secondary air main pipe 410, and heating auxiliary structures such as heating resistors are provided in the air preheater.

[0050] The computer can adjust the rotation speed of the secondary air blower 420 by controlling the frequency converter controller of the blower, thereby controlling the air output volume of the secondary air blower 420. The secondary air blower 420 is put into automatic operation under the control of the DSC automation system, and conveys air to the secondary air main pipe 410. The air enters the secondary air duct 413 from the secondary air main pipe 410, and finally is transmitted into the furnace chamber 100. The secondary air duct 413 brings a large amount of oxygen to the incinerator, which plays a crucial role in whether the combustible components can burn completely. At the same time, the secondary air is injected into the incinerator at a high speed, enhancing the turbulence intensity in the incinerator, which has a great effect on the disturbance of the flue gas in the furnace. In this way, the residence time of the flue gas can be extended, thereby reducing the emission of dioxins in the flue gas and affecting the generation of NOx. It can also make the distribution of the high-temperature area in the incinerator more uniform, reducing the probability of large temperature deviation.

[0051] Meanwhile, when the secondary air blower 420 conveys air to the secondary air main pipe 410, the air can be preheated by the air preheater first, heated to 200 - 300 °C and then conveyed into the furnace 100. The heated high-temperature air can accelerate the evaporation of moisture in the garbage, enabling the garbage to reach the ignition point faster.

[0052] The moisture content of garbage varies throughout the year and changes with the seasons. Considering this, it is necessary to adjust the flow rate and temperature of the primary air and the flow rate and temperature of the secondary air to meet the requirements of processing garbage with different moisture contents.

[0053] As Figure 3 and 4 shown, each spray gun layer 520 is provided with a total of 28 nozzles 521 in the inner and outer circles, 14 nozzles 521 in the inner circle and 14 nozzles 521 in the outer circle, and the spacing between each nozzle 521 on the inner / outer circle is equal. The shape of the nozzle 521 is like a shower head, and the nozzles 521 on the inner and outer circles are symmetrically arranged.

[0054] The overall specific usage process of the device is as shown in the conceptual flow chart of Figure 5 more specifically:

[0055] Put the garbage into the feed inlet 120, and the garbage starts to burn after entering the furnace 100. At this time, the computer adjusts the rotation speed of the primary air blower 320 by controlling the frequency converter controller of the blower, thereby controlling the air output volume of the primary air blower 320. The primary air blower 320 is put into automatic operation under the control of the DSC automation system. The primary air blower 320 conveys air to the air preheater, heats the air to 200 °C and then conveys it through the primary air main pipe 310 to each primary air pipe 311. Then, the air is conveyed to the ash hopper 210 through the primary air pipe 311, and finally, the air is conveyed from the ash hopper 210 to the grate 200. The air enters the furnace 100 through the spray holes on the surface of the grate 200, brings oxygen to the burning garbage, and provides a certain thrust to turn the burning garbage, helping the garbage to burn more fully. The ash hopper 210 can accommodate the fly ash generated during garbage combustion.

[0056] Furthermore, the computer adjusts the rotation speed of the secondary air blower 420 by controlling the frequency converter controller of the blower, thereby controlling the air output of the secondary air blower 420. The secondary air blower 420 is put into automatic operation under the control of the DSC automation system. The secondary air blower 420 conveys air to the air preheater, heats the air to 200 °C, and then passes it through the main secondary air pipe 410. Along each branch pipe 412 of the main secondary air pipe 410, the air is conveyed into the four secondary air pipes 413 arranged on the inner wall of the furnace chamber 100, and the air is conveyed to the middle of the furnace chamber 100 through the spray holes on the spray nozzles 413a of the secondary air pipes 413. The air conveyed by the secondary air pipes 413 can bring a large amount of oxygen to the incinerator, which plays a crucial role in whether the combustible components can be completely burned. At the same time, the secondary air is injected into the incinerator at a high speed, enhancing the turbulence intensity in the incinerator and having a great effect on the disturbance of the flue gas in the furnace. In this way, the residence time of the flue gas can be extended, thereby reducing the emission of dioxins in the flue gas and affecting the generation of NOx. It can also make the distribution of the high-temperature area in the incinerator more uniform and reduce the probability of large temperature deviation.

[0057] With the assistance of the primary air and secondary air, the flue gas generated after the garbage is burned runs upward along the flue 110. The temperature sensor 540a and the speed sensor 540b arranged in the middle of the flue 110 monitor the speed and temperature of the flue gas in the flue 110. Then the information is transmitted to the hydraulic sensor, and the computer connected to the hydraulic sensor issues an instruction to make the SNCR spray gun assembly 500 start to move up and down. At this time, multiple shower-shaped nozzles 521 on the SNCR spray gun layer 520 release a reducing agent solution (such as ammonia water, urea solution, etc.) outward. The reducing agent solution instantaneously becomes aerosol under the action of the high-temperature flue gas. These aerosol-shaped reducing agent solutions react with the nitrogen oxides in the flue gas to generate clean N2. The flue gas after the reduction treatment continues to rise along the flue 110 and is discharged from the incinerator, and the waste residue generated after the garbage is burned is discharged from the slag outlet 130 of the incinerator.

Claims

1. A reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device, comprising a furnace (100), a flue (110) provided in the furnace (100) for flue gas circulation, a grate (200) provided inside the furnace (100) and located at the bottom of the furnace (100), a hopper (210) provided below the grate (200), a primary air supply system (300) provided below the hopper (210), and a secondary air supply system (400) provided above the grate (200), characterized in that, It further includes an SNCR spray gun assembly (500) disposed inside the flue (110). The SNCR spray gun assembly (500) includes a spray gun main pipe (510), and multiple layers of spray gun layers (520) arranged successively downward on the spray gun main pipe (510); the multiple layers of spray gun layers (520) are enlarged successively from top to bottom. Each spray gun layer (520) includes an inner ring and an outer ring, and nozzles (521) are provided on both the inner ring and the outer ring; a position control unit (530) for controlling the up and down movement of the SNCR spray gun assembly (500) is provided at the top of the furnace (100), and a detection unit (540) for detecting the environment of the SNCR spray gun assembly (500) and controlling the opening and closing of the position control unit (530) is provided in the middle of the flue (110).

2. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 1, characterized in that the detection unit (540) includes a temperature sensor (540a) and a speed sensor (540b).

3. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 1, characterized in that the spray gun layer (520) is an annular object, and a plurality of shower-shaped nozzles (521) are annularly arranged on both its inner and outer rings.

4. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 1, characterized in that the primary air supply system (300) includes a primary air main pipe (310). The primary air main pipe (310) is a hollow pipe with one end open. It is horizontally arranged below the ash hopper (210), and a primary air pipe (311) is communicated with one side of the ash hopper (210). The primary air pipe (311) extends upward to be communicated with the ash hopper (210), and a primary air fan (320) is connected to the open end of the primary air main pipe (310).

5. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 4, characterized in that a primary air air preheater (330) is added between the primary air fan (320) and the primary air main pipe (310).

6. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 1, characterized in that the secondary air supply system (400) includes a secondary air main pipe (410). The secondary air main pipe (410) includes a main pipe (411) and multiple branch pipes (412). One end of the main pipe (411) is communicated with a secondary air fan (420), and the other end collects multiple branch pipes (412). The far end of each branch pipe (412) from the main pipe (411) is communicated with a secondary air pipe (413). The secondary air pipe (413) is attached to the inner wall of the furnace (100), and the secondary air pipe (413) is inclined downward.

7. The reverse reciprocating waste incineration boiler air distribution collaborative SNCR spray gun arrangement device according to claim 6, characterized in that The secondary air duct (413) is extended into the furnace (100) with a spray pipe (413a), and the air outlet end of the spray pipe (413a) is communicated with the furnace (100).

8. The air distribution collaborative SNCR spray gun layout device for a reverse-pushing reciprocating waste incineration boiler according to claim 7, characterized in that Spray holes are provided on the side wall of the spray pipe (413a).

9. The air distribution collaborative SNCR spray gun layout device for a reverse-pushing reciprocating waste incineration boiler according to any one of claims 6-8, characterized in that A secondary air preheater (430) is additionally provided between the secondary air fan (420) and the secondary air main pipe (410).

10. The air distribution collaborative SNCR spray gun layout device for a reverse-pushing reciprocating waste incineration boiler according to claim 1, characterized in that Spray holes are provided on the surface of the grate (200) in contact with the furnace (100).

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