A waste gas denitrification device and waste gas treatment system

Abstract

The present application relates to the technical field of waste gas treatment, and specifically to a waste gas denitration device and its waste gas treatment system. The present application provides a waste gas denitration device, including a shell and a temperature sensor for monitoring the temperature of boiler waste gas in the shell; the two ends of the shell are respectively provided with an inlet for boiler waste gas to enter and an outlet for boiler waste gas to flow out, one side of the shell is connected to an air intake pipe, and the air intake pipe is installed with an air pump capable of delivering low-temperature gas into the shell and a controller for controlling the air extraction amount of the air pump; a denitration mechanism composed of a plurality of catalytic bins is arranged in the shell, and baffles are arranged above the catalytic bins except one catalytic bin, and a moving mechanism is arranged in the shell, and the moving mechanism can move the baffle upward when the amount of low-temperature air entering the shell increases. The present application can reduce energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a waste gas denitration device and a waste gas treatment system thereof. Background Art

[0002] A large amount of waste gas is generated in industrial production, which usually contains nitrogen oxide compounds. Directly discharging these waste gases will pollute the atmospheric environment and ecosystem, and will also have a negative impact on human health. Therefore, it is necessary to denitrate the waste gas before discharging it. The commonly used denitrification method is to spray urea aqueous solution into the waste gas, and high temperature decomposes urea to produce ammonia. Then, under the action of the catalyst, urea or ammonia reacts with nitrogen oxide compounds in the waste gas to produce nitrogen and water vapor.

[0003] In production, common waste gas is boiler waste gas, which is also called flue gas. When denitrifying boiler waste gas, due to the high temperature of the waste gas after combustion, if it directly enters the denitrification reactor, it will cause local overheating or uneven mixing of the waste gas, which will affect the denitrification efficiency. Therefore, it is usually necessary to control the temperature of the boiler waste gas participating in the reaction. Referring to the Chinese patent document with the authorization announcement number CN107126834B, the subject name is a flue gas denitrification system and a denitrification method. In the patent, a denitrification mechanism is provided, and the flue gas generated in the production enters the denitrification mechanism. When denitrification is performed, the temperature sensor can monitor the flue gas temperature at the denitrification mechanism and compare it with the denitrification reaction temperature value. If the flue gas temperature at the denitrification mechanism exceeds the denitrification reaction temperature value range, the controller adjusts the high-temperature gas regulating valve and the low-temperature gas regulating valve to change the supply ratio of the high-temperature gas and the low-temperature gas. The high-temperature gas and the low-temperature gas are then mixed, and the mixed gas is mixed with the flue gas again so that the flue gas temperature at the denitrification mechanism is within a reasonable range, ensuring that the denitrification reaction proceeds normally. At the same time, the pressure sensor monitors the pressure in the air distribution room, and controls the opening size of the high-temperature gas regulating valve and the low-temperature gas regulating valve through the controller, that is, the total supply of the mixed gas is kept unchanged, the air pressure in the denitrification mechanism is stable, and the reaction proceeds normally.

[0004] With respect to the above-mentioned related technologies, when cooling the flue gas, the above-mentioned technologies are based on the premise of maintaining the total amount of the mixture of high-temperature gas, low-temperature gas and flue gas unchanged, and then adjusting the mixing ratio of high-temperature gas and low-temperature gas according to the amount and temperature of the flue gas to obtain a mixed gas, so that the flue gas can reach a suitable temperature after the mixed gas and the flue gas are mixed. However, the gas needs to be heated when obtaining the high-temperature gas, which will increase additional energy consumption. Summary of the invention

[0005] In order to solve the technical problem of increased energy consumption, the present application provides a waste gas denitrification device and a waste gas treatment system thereof.

[0006] In the first aspect, the present application provides an exhaust gas denitrification device that adopts the following technical solution: an exhaust gas denitrification device, comprising a shell and a temperature sensor for monitoring the temperature of boiler exhaust gas in the shell; an inlet for boiler exhaust gas to enter and an outlet for boiler exhaust gas to flow out are respectively provided at both ends of the shell, and one side of the shell is connected to an air intake pipe, on which an air pump capable of delivering low-temperature gas into the shell and a controller for controlling the air extraction amount of the air pump are installed; a denitrification mechanism consisting of a plurality of catalytic bins is arranged in the shell, and above the catalytic bins other than one catalytic bin are Baffles are provided, and a moving mechanism is provided in the shell, which can make the baffle move up when the amount of low-temperature air entering the shell increases; the moving mechanism includes a placement bin arranged in the shell, the air inlet pipe can be connected with the placement bin, a piston tube is provided in the placement bin, the top of the piston tube is connected with a connecting pipe that can be connected with the outside of the shell, a piston rod is slidably connected in the piston tube, the piston rod passes through the bottom of the placement bin and is connected with the baffle located on the outside, a circular ring is fixedly connected to the circumferential side wall of the baffle located on the inner side of the outer baffle, and a limiting block is fixed on the circumferential side wall of the top of the circular ring.

[0007] By adopting the above technical scheme, when denitrifying the boiler exhaust gas, the temperature sensor can monitor the boiler exhaust gas temperature in the shell, and the controller can control the vacuum pump to change the amount of low-temperature gas, thereby completing the cooling of the boiler exhaust gas. Subsequently, when the boiler temperature is high and the controller controls the amount of low-temperature gas entering the shell to increase, the moving mechanism can drive the baffle to move up to open multiple catalytic chambers. By opening multiple catalytic chambers, the cross-sectional area for the boiler exhaust gas to pass through is increased, so that the boiler exhaust gas can pass through the catalytic zone at an appropriate speed, thereby ensuring the denitrification effect of the boiler exhaust gas.

[0008] In the present application, the boiler exhaust gas is cooled by adding different amounts of low-temperature gas corresponding to different temperatures instead of mixing high-temperature and low-temperature gases. In the present application, the addition of different amounts of low-temperature gas will correspond to different cross-sectional areas for the low-temperature gas to pass through, so that the gas can pass through the catalytic zone at an appropriate speed, ensuring the normal reaction. The entire process does not require heating, which is beneficial to reducing energy consumption.

[0009] When low-temperature gas is introduced, the air pressure in the storage chamber will increase, and there will be a pressure difference between the gases on both sides of the piston rod. The piston rod will tend to slide upward under the action of the pressure difference, but due to the influence of the gravity of the baffle, ring and limit block, the pressure difference on the piston rod needs to overcome these gravity before it can move upward.

[0010] When the amount of low-temperature gas introduced continues to increase, the piston rod and all baffles first remain in place, and then the piston rod and the outer baffle move up, and then when the outer baffle moves to abut against the adjacent inner limit block, the piston rod and the outer baffle stop moving, and then the piston rod continues to move up and drives the outer baffle and the adjacent inner baffle to move up; when all the baffles move up and the amount of low-temperature gas introduced continues to decrease, the air pressure in the storage bin will decrease, and first the piston rod drives all the baffles to move down, and then the baffle in the center position moves back to the initial position to contact the catalytic bin, and then the piston rod and the remaining baffles stop moving down, and then the piston rod and the remaining baffles continue to move down.

[0011] Optionally, the catalytic chamber is composed of a plurality of concentrically arranged cylindrical sleeves and a plurality of connecting rods in a circumferential array, and the diameters of the plurality of cylindrical sleeves gradually increase from the inside to the outside, and the connecting rods are used to connect the plurality of cylindrical sleeves.

[0012] By adopting the above technical solution, when the baffle of the inner circle catalytic bin is not moved up, the temperature of the boiler exhaust gas itself passing through the outer circle catalytic bin and the reaction exothermic energy can preheat the inner circle catalytic bin, so that the inner circle catalytic bin can quickly reach a suitable reaction temperature after opening, thereby improving the speed at which the boiler exhaust gas participates in the reaction after entering the inner circle catalytic bin.

[0013] Optionally, a dripping pipe is provided in the storage bin, the dripping pipe is connected to a liquid inlet pipe for conveying the urea aqueous solution, and an atomizing nozzle is connected to the outer wall of the storage bin.

[0014] By adopting the above technical scheme, the urea aqueous solution entering the storage bin can be atomized and sprayed out from the atomizing nozzle together with the low-temperature gas under the pressure of the low-temperature gas. On the one hand, it can reduce the risk of clogging of the atomizing nozzle, and on the other hand, it can facilitate the mixing of the low-temperature gas and the boiler exhaust gas.

[0015] Optionally, a processing chamber is provided on one side of the shell, the bottom of the processing chamber is connected to the outlet, the top of the processing chamber is connected, the top of the processing chamber is connected to an air outlet pipe, and the end of the air inlet pipe away from the shell is connected to the air outlet pipe.

[0016] By adopting the above technical solution, through the setting of connecting one end of the air inlet pipe with the air outlet pipe, the boiler exhaust gas after denitrification can be re-input. On the one hand, the denitrification effect of the boiler exhaust gas can be improved through the circulation input of the boiler exhaust gas. On the other hand, the oxygen content in the boiler exhaust gas is low, which can reduce the risk of side reactions between excess oxygen and ammonia.

[0017] Optionally, a condensation plate is provided in the processing chamber.

[0018] By adopting the above technical solution, the water vapor in the boiler exhaust gas can be condensed, reducing the risk of the water vapor re-entering the shell and affecting the catalytic reaction.

[0019] Optionally, an S-shaped water pipe is provided in the processing chamber, and the water pipe passes through the condensation plate.

[0020] By adopting the above technical solution and setting a water pipe, the condensation plate can be cooled, thereby improving the cooling effect on the boiler exhaust gas and the condensation effect on the water vapor.

[0021] Optionally, a water spray pipe that can be connected to an external water supply source is provided in the processing chamber below the condensation plate, and a water outlet is provided at the bottom of the processing chamber.

[0022] By adopting the above technical solution and setting up a water spray pipe, the boiler exhaust gas after denitrification can be sprayed. On the one hand, it can remove particulate matter in the boiler exhaust gas and reduce the risk of environmental pollution. On the other hand, it can cool the boiler exhaust gas.

[0023] In a second aspect, the present application provides an exhaust gas treatment system, which adopts the following technical solution:

[0024] A waste gas treatment system comprises a waste gas denitration device as described in the first aspect: the waste gas denitration device is used for denitrifying boiler waste gas.

[0025] In summary, the present application includes at least one of the following beneficial effects:

[0026] 1. In the present application, the boiler exhaust gas is cooled by adding different amounts of low-temperature gas corresponding to different temperatures instead of mixing high-temperature and low-temperature gases. In the present application, adding different amounts of low-temperature gas will correspond to different cross-sectional areas for the low-temperature gas to pass through, so that the gas can pass through the catalytic zone at an appropriate speed, ensuring the normal reaction. The entire process does not require heating, which is beneficial to reducing energy consumption.

[0027] 2. By connecting one end of the air inlet pipe with the air outlet pipe, the boiler exhaust gas after denitration can be re-input. On the one hand, the denitration effect of the boiler exhaust gas can be improved through the circulation input of the boiler exhaust gas. On the other hand, the low oxygen content in the boiler exhaust gas can reduce the risk of side reactions between excess oxygen and ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the structure of the mobile mechanism in the embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the structure of the dropper in the embodiment of the present application;

[0031] Figure 4This is a schematic diagram of the structure of the catalytic bin in the embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the structure of the baffle in the embodiment of the present application;

[0033] Figure 6 It is a schematic diagram of the structure of the condensation plate and the water spray pipe in the embodiment of the present application.

[0034] Explanation of the reference numerals: 1. Shell; 11. Inlet; 12. Outlet; 13. Air inlet pipe; 2. Denitrification mechanism; 21. Catalytic chamber; 211. Cylindrical sleeve; 212. Connecting rod; 3. Vacuum pump; 4. Baffle; 5. Moving mechanism; 51. Placement chamber; 511. Atomizing nozzle; 52. Piston tube; 53. Connecting pipe; 54. Piston rod; 55. Ring; 56. Limiting block; 6. Drip tube; 61. Liquid inlet pipe; 7. Processing chamber; 71. Air outlet pipe; 72. Water outlet; 8. Condensation plate; 81. Water pipe; 9. Water spray pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 6 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0036] In a first aspect, an embodiment of the present application discloses a waste gas denitrification device.

[0037] Reference Figure 1 and Figure 2A waste gas denitration device comprises a shell 1, a denitration mechanism 2 arranged in the shell 1, a temperature sensor capable of monitoring the temperature of boiler exhaust gas in the shell 1 is arranged in the shell 1, an inlet 11 for boiler exhaust gas to enter and an outlet 12 for boiler exhaust gas to flow out are respectively opened at both ends of the shell 1, an air intake pipe 13 is connected to one side of the shell 1, an air pump 3 capable of sending low-temperature gas into the shell 1 and a controller for controlling the air extraction amount of the air pump 3 are installed on the air intake pipe 13, when the temperature sensor monitors that the temperature of the boiler exhaust gas in the shell 1 is higher than the denitration temperature reaction range, the controller can control the air pump 3 to change the amount of low-temperature gas entering the shell 1, a denitration mechanism 2 composed of a plurality of catalytic bins 21 is arranged in the shell 1, SCR (Selective Catalytic Reduction) catalysts are arranged in the catalytic bins 21, and baffles 4 are arranged above the catalytic bins 21 except one catalytic bin 21, a moving mechanism 5 is arranged in the shell 1, and the moving mechanism 5 is used to move the baffles 4 upward in sequence when the amount of low-temperature air entering the shell 1 increases.

[0038] When denitrifying the boiler exhaust gas, the temperature sensor can monitor the boiler exhaust gas temperature in the shell 1, and the controller can control the vacuum pump 3 to change the amount of low-temperature gas, thereby completing the cooling of the boiler exhaust gas. Subsequently, when the boiler exhaust gas temperature is high and the controller controls the amount of low-temperature gas entering the shell 1 to increase, the moving mechanism 5 can drive the baffle 4 to move upward to open multiple catalytic bins 21. By opening multiple catalytic bins 21, the cross-sectional area for the boiler exhaust gas to pass through is increased, so that the boiler exhaust gas can pass through the catalytic bin 21 at an appropriate speed, thereby ensuring the denitrification effect of the boiler exhaust gas.

[0039] In the present application, the boiler exhaust gas is cooled by adding different amounts of low-temperature gas corresponding to different temperatures instead of mixing high-temperature and low-temperature gases. In the present application, adding different amounts of low-temperature gas will correspond to different cross-sectional areas for the low-temperature gas to pass through, so that the gas can pass through the catalytic chamber 21 at an appropriate speed, ensuring the normal reaction. The entire process does not require heating, which is beneficial to reducing energy consumption.

[0040] Reference Figures 2 to 4 The catalytic chamber 21 is composed of a plurality of concentrically arranged cylindrical sleeves 211 and a plurality of connecting rods 212 in a circumferential array, and the diameters of the plurality of cylindrical sleeves 211 gradually increase from the inside to the outside, and the connecting rods 212 are used to connect the plurality of cylindrical sleeves 211 .

[0041] By setting up multiple concentric cylindrical sleeves 211, the temperature of the boiler exhaust gas itself passing through the outer circle catalytic chamber 21 and the reaction exothermic energy can preheat the inner circle catalytic chamber 21, so that the inner circle catalytic chamber 21 can quickly reach a suitable reaction temperature after opening, thereby improving the speed at which the boiler exhaust gas participates in the reaction after entering the inner circle catalytic chamber 21.

[0042] Reference Figure 2 , Figure 3 and Figure 5 The moving mechanism 5 includes a placement bin 51 arranged in the shell 1, the air inlet pipe 13 can be connected to the placement bin 51, a piston tube 52 is arranged in the placement bin 51, the top of the piston tube 52 is connected to a connecting pipe 53 that can be connected to the outside of the shell 1, a piston rod 54 is slidably connected in the piston tube 52, a circular ring 55 is fixedly connected to the circumferential side wall of the baffle 4, the piston rod 54 passes through the bottom of the placement bin 51 and is fixedly connected to a moving frame, the moving frame is fixedly connected to the circular ring 55 on the outer baffle 4, a connecting hole is opened on the circular ring 55 on the outer baffle 4, and a limiting block 56 is fixed on the top of the circular ring 55 on the inner baffle 4.

[0043] When low-temperature gas is introduced, the air pressure in the storage chamber 51 will increase, and there will be a pressure difference between the gases on both sides of the piston rod 54. The piston rod 54 will tend to slide upward under the action of the pressure difference, but due to the influence of the gravity of the baffle 4, the ring 55 and the limit block 56, the pressure difference on the piston rod 54 needs to overcome these gravity before it can move upward.

[0044] When the amount of low-temperature gas introduced continues to increase, first the piston rod 54 and all baffles 4 remain in place, then the piston rod 54 and the outer baffle 4 move upward, and then when the outer baffle 4 moves to abut against the adjacent inner limit block 56, the piston rod 54 and the outer baffle 4 stop moving, and then the piston rod 54 continues to move upward and drives the outer baffle 4 and the adjacent inner baffle 4 to move upward; when all the baffles 4 move upward and the amount of low-temperature gas introduced continues to decrease, the air pressure in the placement chamber 51 will decrease, first the piston rod 54 drives all the baffles 4 to move downward, and then the baffle 4 at the center position moves back to the initial position to contact the catalytic chamber 21, and then the piston rod 54 and the remaining baffles 4 stop moving downward, and then the piston rod 54 and the remaining baffles 4 continue to move downward.

[0045] Reference Figure 2 and Figure 3 A dripping pipe 6 is arranged in the placement bin 51 , and the dripping pipe 6 is connected to a liquid inlet pipe 61 for conveying the urea aqueous solution, and an atomizing nozzle 511 is connected to the outer wall of the placement bin 51 .

[0046] By setting the atomizing nozzle 511, the urea aqueous solution entering the storage bin 51 can be atomized and sprayed out from the atomizing nozzle 511 together with the low-temperature gas under the pressure of the low-temperature gas. On the one hand, it can reduce the risk of clogging of the atomizing nozzle 511, and on the other hand, it can facilitate the mixing of the low-temperature gas and the boiler exhaust gas.

[0047] Reference Figure 1 , Figure 2 and Figure 6A processing chamber 7 is provided on one side of the shell 1 , the bottom of the processing chamber 7 is connected to the outlet 12 , the top of the processing chamber 7 is connected to an air outlet pipe 71 , and the end of the air inlet pipe 13 away from the shell 1 is connected to the air outlet pipe 71 .

[0048] By connecting one end of the air inlet pipe 13 with the air outlet pipe 71, the boiler exhaust gas after denitration can be re-input. On the one hand, the denitration effect of the boiler exhaust gas can be improved by the circulating input of the boiler exhaust gas. On the other hand, the low oxygen content in the boiler exhaust gas can reduce the risk of side reactions between excess oxygen and ammonia.

[0049] Reference Figure 4 A condensation plate 8 is arranged in the processing chamber 7, and the condensation plate 8 is arranged in a transverse V shape.

[0050] By providing the condensation plate 8, the water vapor in the boiler exhaust gas can be condensed, thereby reducing the risk of the water vapor re-entering the shell 1 and affecting the catalytic reaction.

[0051] Reference Figure 6 An S-shaped water pipe 81 is provided in the processing chamber 7 , and the water pipe 81 passes through the condensation plate 8 .

[0052] By providing the water pipe 81, the condensation plate 8 can be cooled, thereby improving the cooling effect on the boiler exhaust gas and the condensation effect on the water vapor.

[0053] Reference Figure 6 A water spray pipe 9 which can be connected to an external water supply source is arranged below the condensation plate 8 in the processing chamber 7, and a water outlet 72 is arranged at the bottom of the processing chamber 7.

[0054] By setting the water spray pipe 9, the boiler exhaust gas after denitration can be sprayed, which can remove particulate matter in the boiler exhaust gas and reduce the risk of environmental pollution on the one hand, and cool the boiler exhaust gas on the other hand.

[0055] The implementation principle of an exhaust gas denitration device and an exhaust gas treatment system in the embodiment of the present application is as follows:

[0056] When the boiler exhaust gas is denitrified, the boiler exhaust gas enters the shell 1 from the inlet 11, and the temperature sensor can monitor the boiler flue gas temperature in the shell 1. The controller can control the vacuum pump 3 to change the amount of low-temperature gas entering the placement chamber 51. At the same time as the boiler exhaust gas enters the placement chamber, the dropper 6 drips urea aqueous solution into the placement chamber 51, and then the urea aqueous solution is sprayed out from the atomizing nozzle 511 together with the low-temperature gas under the action of the gas pressure in the placement chamber 51. Thereafter, the sprayed low-temperature gas and urea aqueous solution are mixed with the boiler exhaust gas and enter the catalytic chamber 21 to react.

[0057] When the amount of low-temperature gas continues to increase, the air pressure in the storage bin 51 will increase. First, the piston rod 54 and all baffles 4 remain in place, and then the piston rod 54 moves upward and drives the outer baffle 4 to move upward. Then, the outer baffle 4 moves to abut against the adjacent inner limit block 56, and the piston rod 54 and the outer baffle 4 stop moving. Then, the piston rod 54 continues to move upward and drives the outer baffle 4 and the adjacent inner baffle 4 to move upward. After the baffle 4 moves upward, the corresponding catalytic bin 21 opens, and the boiler exhaust gas reacts in multiple catalytic bins 21 and flows out.

[0058] When all the baffles 4 move up and the amount of low-temperature gas introduced continues to decrease, the air pressure in the placement chamber 51 will decrease. First, the piston rod 54 drives all the baffles 4 to move down, and then the baffle 4 at the center position moves first to abut against the catalytic chamber 21, and then the piston rod 54 and the remaining baffles 4 stop moving down, and then the piston rod 54 and the remaining baffles 4 continue to move down. After the baffle 4 moves down, the corresponding catalytic chamber 21 is closed, and the boiler exhaust gas reacts in a small amount of the catalytic chamber 21 and flows out.

[0059] When the boiler exhaust gas completes denitrification in the catalytic bin 21 and flows out, the boiler exhaust gas enters the treatment bin 7 through the outlet 12, the water sprayed from the water spray pipe 9 contacts the boiler exhaust gas, the boiler exhaust gas is cooled, and the particulate matter in the boiler exhaust gas is blocked, and then the boiler exhaust gas is cooled by the condenser, and the water vapor in the boiler exhaust gas is condensed and falls under the action of the condensation plate 8, and then the boiler exhaust gas continues to flow out and enters the placement bin 51 through the air inlet pipe 13 at the outlet pipe 71 under the action of the vacuum pump 3.

[0060] In a second aspect, an embodiment of the present application further discloses a waste gas treatment system, wherein the waste gas treatment system comprises a waste gas denitrification device in the first aspect: the waste gas denitrification device is used to denitrify boiler waste gas.

[0061] In the present application, unless otherwise clearly stipulated and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0062] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An exhaust gas denitration device, comprising a housing (1) and a temperature sensor for monitoring the temperature of boiler exhaust gas in the housing (1), characterized in that: An inlet (11) for boiler exhaust gas to enter and an outlet (12) for boiler exhaust gas to flow out are respectively provided at both ends of the shell (1); an air inlet pipe (13) is connected to one side of the shell (1); and an air pump (3) capable of delivering low-temperature gas into the shell (1) and a controller for controlling the air extraction amount of the air pump (3) are installed on the air inlet pipe (13); A denitration mechanism (2) composed of a plurality of catalytic bins (21) is arranged in the shell (1), and baffles (4) are arranged above all catalytic bins (21) except one catalytic bin (21). A moving mechanism (5) is arranged in the shell (1), and the moving mechanism (5) can move the baffle (4) upward when the amount of low-temperature air entering the shell (1) increases. The moving mechanism (5) comprises a storage bin (51) arranged in the housing (1), an air inlet pipe (13) being connected to the storage bin (51), a piston tube (52) being arranged in the storage bin (51), a connecting pipe (53) being connected to the outside of the housing (1) at the top of the piston tube (52), a piston rod (54) being slidably connected in the piston tube (52), the piston rod (54) passing through the bottom of the storage bin (51) and being connected to a baffle (4) located on the outside, a circular ring (55) being fixedly connected to the circumferential side wall of the baffle (4) located on the inner side of the outer baffle (4), and a limiting block (56) being fixed to the circumferential side wall of the top of the circular ring (55).

2. The exhaust gas denitration device according to claim 1, characterized in that: The catalytic chamber (21) is composed of a plurality of concentrically arranged cylindrical sleeves (211) and a plurality of connecting rods (212) in a circumferential array, wherein the diameters of the plurality of cylindrical sleeves (211) gradually increase from the inside to the outside, and the connecting rods (212) are used to connect the plurality of cylindrical sleeves (211).

3. The exhaust gas denitration device according to claim 2, characterized in that: A dripping pipe (6) is arranged in the storage bin (51), the dripping pipe (6) is connected to a liquid inlet pipe (61) for conveying urea aqueous solution, and an atomizing nozzle (511) is connected to the outer wall of the storage bin (51).

4. The exhaust gas denitration device according to claim 3, characterized in that: A processing chamber (7) is provided on one side of the shell (1); the bottom of the processing chamber (7) is connected to the outlet (12); the top of the processing chamber (7) is connected to an air outlet pipe (71); and one end of the air inlet pipe (13) away from the shell (1) is connected to the air outlet pipe (71).

5. The exhaust gas denitration device according to claim 4, characterized in that: A condensation plate (8) is provided in the processing chamber (7).

6. The exhaust gas denitration device according to claim 5, characterized in that: The processing chamber (7) is provided with an S-shaped distributed water pipe (81), and the water pipe (81) passes through the condensation plate (8).

7. The exhaust gas denitration device according to claim 5, characterized in that: A water spray pipe (9) capable of being connected to an external water supply source is provided in the processing chamber (7) below the condensation plate (8), and a water outlet (72) is provided at the bottom of the processing chamber (7).

8. An exhaust gas treatment system, comprising an exhaust gas denitration device according to any one of claims 1 to 7, characterized in that: The exhaust gas denitration device is used to denitrate boiler exhaust gas.

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