Steam denitration device and accelerated diffusion denitration method

Abstract

The invention discloses a steam denitration device and an accelerated diffusion denitration method, and particularly relates to the field of flue gas denitration.The steam denitration device comprises a purification tower and a flue gas temporary storage mechanism, a gas distributor and a catalyst bed are arranged in the purification tower, and the flue gas temporary storage mechanism comprises a temporary storage box; the gas inlet end of the purification tower is fixedly communicated with the exhaust end of the temporary storage box, and flue gas enters the temporary storage box and enters the purification tower through the exhaust end of the temporary storage box; an air injection mechanism is arranged at the exhaust end of the temporary storage box and comprises an air injection pipe. The flue gas temporary storage mechanism is arranged, the buffer part is arranged in the temporary storage box, and the piston piece can be automatically regulated and controlled to move in the closed buffer cylinder according to the air pressure in the temporary storage box, so that the internal capacity of the temporary storage box is expanded, the release amount of flue gas and the release amount of ammonia gas are ensured to be always in a balanced state, ammonia escape is avoided, and the purification efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration, and more specifically, to a steam denitration device and an accelerated diffusion denitration method. Background Art

[0002] Denitrification devices are specially designed to remove nitrogen oxides (NOx) from flue gas during industrial production. They are suitable for thermal power generation, steel, cement, chemical and other industries. In these industries, the flue gas produced by fuel combustion contains nitrogen oxides (NOx) that need to be treated. Direct emission of such flue gas will pollute the environment. Therefore, denitrification devices are required to eliminate nitrogen oxides (NOx) before emission to ensure compliance with environmental protection standards.

[0003] Currently, selective catalytic reduction (SCR) technology is one of the commonly used denitrification methods. It uses ammonia or urea as a reducing agent to react chemically with nitrogen oxides (NOx) in the flue gas to generate harmless nitrogen and water. In order to increase the contact area between ammonia and flue gas and the reaction efficiency, liquid ammonia is usually converted into gas through an ammonia evaporator, and after being fully mixed with the flue gas, it enters a reactor equipped with a catalyst for reaction. The nitrogen and water finally generated are discharged from the system.

[0004] However, due to load changes, combustion condition adjustments, dynamic characteristics of the process flow and environmental factors in the industrial production process, the amount of flue gas entering the denitrification device fluctuates, resulting in uncertainty in the flue gas volume. This uncertainty makes it difficult to accurately control the amount of ammonia released, which can easily cause ammonia escape, that is, unreacted ammonia is discharged into the environment, which will not only cause the catalyst in the denitrification device to fail, but also cause environmental pollution. Summary of the invention

[0005] The present invention provides a steam denitration device and an accelerated diffusion denitration method, and aims to solve the following problem: due to load changes, combustion condition adjustments, dynamic characteristics of the process flow and environmental factors in the existing steam denitration device, the flue gas volume of the denitration device fluctuates, resulting in uncertainty in the flue gas volume. This uncertainty makes it difficult to accurately control the amount of ammonia released, which easily leads to ammonia escape, that is, unreacted ammonia is discharged into the environment, which not only causes the catalyst in the denitration device to fail, but also causes environmental pollution.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a steam denitration device, comprising a purification tower and a flue gas temporary storage mechanism, wherein a gas distributor and a catalyst bed are arranged in the purification tower, and the flue gas temporary storage mechanism comprises a temporary storage box, wherein the air inlet end of the purification tower is fixedly connected to the exhaust end of the temporary storage box, and the flue gas enters the temporary storage box and enters the purification tower through the exhaust end of the temporary storage box; The exhaust end of the temporary storage box is provided with an injection mechanism, the injection mechanism includes an injection pipe, the end of the injection pipe is rotatably provided with a hollow rotating blade, an ammonia evaporator is provided at one end of the injection pipe away from the hollow rotating blade, a nozzle is provided on the hollow rotating blade, and the ammonia gas sprayed by the nozzle forms convection with the flow direction of the flue gas in the exhaust end of the temporary storage box; A buffer component is arranged in the temporary storage box, and the buffer component includes a closed buffer cylinder, the closed buffer cylinder is fixedly arranged on the temporary storage box, a piston plate is slidably arranged in the closed buffer cylinder, and the piston plate increases the volume in the temporary storage box by vertically moving upward in the closed buffer cylinder.

[0007] In a preferred embodiment, an automatic balancing mechanism is provided in the temporary storage box, and the automatic balancing mechanism includes a frame plate with holes, and the frame plate with holes is slidably arranged with the exhaust end of the temporary storage box. A rotating seat is rotatably arranged in the temporary storage box, and a connecting seat is provided on the piston plate, and the frame plate with holes and the connecting seat are both adapted to the rotating seat.

[0008] In a preferred embodiment, a heat exchange tube is fixedly installed in the temporary storage box, a heat exchange liquid is installed in the heat exchange tube, the heat exchange liquid flows in one direction in the heat exchange tube, and the heat exchange tube is used to cool the gas in the temporary storage box.

[0009] In a preferred embodiment, an extension portion is provided at the bottom of the temporary storage box, and a liquid accumulation discharge mechanism is provided in the temporary storage box, the liquid accumulation discharge mechanism includes a support plate, and the support plate is slidably provided in the extension portion, a linear drive is fixedly provided at the bottom of the extension portion, and an output end of the linear drive is fixedly provided to the support plate, a liquid level sensor 1 and a liquid level sensor 2 are fixedly provided in the temporary storage box, the liquid level sensor 1 is located above the liquid level sensor 2, and an electromagnetic valve is fixedly connected to the support plate.

[0010] In a preferred embodiment, a guide seat is fixedly provided in the closed buffer cylinder, a support seat is slidably provided in the closed buffer cylinder, the support seat and the guide seat are slidably provided, the piston plate is fixedly provided in the guide seat, and an elastic member is provided between the closed buffer cylinder and the guide seat.

[0011] In a preferred embodiment, a support shaft is fixedly provided at the bottom of the guide seat, the connecting seat is fixedly provided with the support shaft, a connecting shaft 1 is fixedly provided at the bottom of the connecting seat, an auxiliary seat 1 is rotatably provided at the bottom end of the connecting shaft, and the auxiliary seat 1 is slidably provided on the rotating seat, a connecting shaft 2 is fixedly provided at the bottom of the perforated frame plate, an auxiliary seat 2 is rotatably provided at the bottom end of the connecting shaft 2, and the auxiliary seat 2 is slidably provided on the rotating seat.

[0012] In a preferred embodiment, the air inlet end of the purification tower is fixedly connected to a connecting pipe, a sleeve is fixedly arranged in the connecting pipe, the perforated frame plate is slidably arranged in the sleeve, the end of the connecting pipe away from the purification tower is fixedly connected to a temporary storage box, and the end of the temporary storage box away from the connecting pipe is fixedly connected to an air inlet pipe.

[0013] In a preferred embodiment, one end of the jet pipe away from the hollow rotating blade is fixedly connected to a pump, the air inlet end of the pump is fixedly connected to the exhaust end of the ammonia evaporator, a transmission shaft is fixedly provided on the hollow rotating blade, a bevel gear 1 is fixedly provided on the transmission shaft, a rotating driver is fixedly provided on the connecting pipe, a bevel gear 2 is fixedly provided on the output shaft of the rotating driver, and the bevel gear 1 is meshed with the bevel gear 2.

[0014] In a preferred embodiment, a gas distributor and a catalyst bed are fixedly installed in the purification tower, the gas distributor is located above the catalyst bed, and a drain pipe and an exhaust pipe are fixedly connected to the purification tower.

[0015] An accelerated diffusion denitration method for a steam denitration device comprises the following steps: Step 1: The flue gas to be purified enters the temporary storage box through the air inlet pipe for temporary storage; Step 2: The amount of smoke entering the temporary storage box suddenly increases, and under the action of air pressure, the piston plate is pushed vertically upward in the closed buffer cylinder to expand the volume of the temporary storage box, and at the same time, the effective area of ​​the exhaust end of the temporary storage box is reduced, and then the smoke enters the connecting pipe; Step 3: The ammonia gas sprayed out from the ammonia evaporator forms convection with the flue gas flowing in the connecting pipe, and the ammonia gas and the flue gas undergo a chemical reaction; Step 4: The flue gas continues to flow in the connecting pipe into the purification tower. The gas distributor disperses the flue gas and purifies it through the catalyst bed. Finally, nitrogen and water are generated and discharged from the purification tower.

[0016] The beneficial effects of the present invention are: 1. The present invention provides a flue gas temporary storage mechanism and a buffer component in the temporary storage box, which can automatically adjust the movement of the piston plate in the closed buffer cylinder according to the air pressure in the temporary storage box to expand the capacity inside the temporary storage box, ensure that the release amount of flue gas and the release amount of ammonia are always in a balanced state, avoid ammonia escape, extend the service life of the catalyst, and improve the purification efficiency.

[0017] 2. The present invention sets an automatic balancing mechanism. The movement of the piston plate drives the rotating seat to rotate, and the rotating seat drives the perforated frame plate to move vertically, so as to automatically adjust the aperture of the connecting pipe according to the movement of the piston plate, and further balance the smoke entering the connecting pipe from the temporary storage box to always maintain a relatively constant exhaust flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the purification tower of the present invention.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the temporary storage box of the present invention from the front view.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the connecting pipe of the present invention from the front view.

[0021] Figure 4 It is a schematic diagram of the structure of the hollow rotating blade of the present invention when viewed from above.

[0022] Figure 5 It is a schematic structural diagram of the purification tower of the present invention from the front view.

[0023] Figure 6 It is a schematic diagram of the horizontal rotation trajectory of the rotating seat of the present invention.

[0024] Figure 7 It is a schematic diagram of the cross-sectional structure of the support plate of the present invention from the front view.

[0025] Figure 8 It is a schematic diagram of the vertical movement trajectory of the support plate of the present invention.

[0026] Fig. 9 It is a schematic diagram of the denitration method process of the present invention.

[0027] The accompanying drawings are marked as follows: 1. purification tower; 11. gas distributor; 12. catalyst bed; 13. connecting pipe; 131. sleeve; 2. flue gas temporary storage mechanism; 21. temporary storage box; 211. extension; 22. air inlet pipe; 23. closed buffer cylinder; 24. piston plate; 25. elastic member; 3. jet mechanism; 31. jet pipe; 32. hollow rotating blade; 321. nozzle; 33. pump; 4. automatic balancing mechanism; 41. frame plate with holes; 42. connecting seat; 43. rotating seat; 5. heat exchange tube; 6. accumulated liquid discharge mechanism; 61. support plate; 62. linear drive; 63. liquid level sensor 1; 64. liquid level sensor 2; 65. solenoid valve. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Refer to the instruction manual Figures 1 to 6A steam denitration device comprises a purification tower 1 and a flue gas temporary storage mechanism 2. A gas distributor 11 and a catalyst bed 12 are arranged in the purification tower 1. The flue gas temporary storage mechanism 2 comprises a temporary storage box 21. The air inlet end of the purification tower 1 is fixedly connected with the exhaust end of the temporary storage box 21. The flue gas enters the temporary storage box 21 and enters the purification tower 1 through the exhaust end of the temporary storage box 21. An injection mechanism 3 is provided on the exhaust end of the temporary storage box 21, and the injection mechanism 3 includes an injection pipe 31, and a hollow rotating blade 32 is rotatably provided at the end of the injection pipe 31. An ammonia evaporator is provided at one end of the injection pipe 31 away from the hollow rotating blade 32, and a nozzle 321 is provided on the hollow rotating blade 32. The ammonia gas sprayed by the nozzle 321 forms convection with the flow direction of the flue gas in the exhaust end of the temporary storage box 21; A buffer component is provided in the temporary storage box 21, and the buffer component includes a closed buffer cylinder 23, which is fixedly provided on the temporary storage box 21, and a piston plate 24 is slidably provided in the closed buffer cylinder 23. The piston plate 24 increases the volume in the temporary storage box 21 by moving vertically upward in the closed buffer cylinder 23.

[0030] The air inlet end of the purification tower 1 is fixedly connected with a connecting pipe 13, a sleeve 131 is fixedly arranged in the connecting pipe 13, a perforated frame plate 41 is slidably arranged in the sleeve 131, and the end of the connecting pipe 13 away from the purification tower 1 is fixedly connected with the temporary storage box 21, and the end of the temporary storage box 21 away from the connecting pipe 13 is fixedly connected with the air inlet pipe 22. A gas distributor 11 and a catalyst bed 12 are fixedly arranged in the purification tower 1, and the gas distributor 11 is located above the catalyst bed 12. A drain pipe and an exhaust pipe are fixedly connected on the purification tower 1. The catalyst bed 12 includes but is not limited to being set as a vanadium-based catalyst or a manganese-based catalyst, and the gas distributor 11 is used to connect the connecting pipe 13.

[0031] A guide seat is fixedly arranged in the closed buffer cylinder 23, a support seat is slidably arranged in the closed buffer cylinder 23, the support seat and the guide seat are slidably arranged, the piston plate 24 is fixedly arranged in the guide seat, an elastic member 25 is arranged between the closed buffer cylinder 23 and the guide seat, and the elastic member 25 is arranged as a spring.

[0032] It should be noted that the flue gas generated by thermal power generation, steel, cement, chemical and other industries usually contains particulate impurities. After the impurity particles in the flue gas enter the purification tower 1, they may cause corrosion to the purification tower 1 and increase the difficulty of maintenance. In order to avoid the above situation, it is necessary to use filtering equipment to filter out the particulate impurities in the flue gas before flue gas purification. The filtering equipment includes but is not limited to the use of a cyclone dust collector. The flue gas after dust removal by the cyclone dust collector enters the temporary storage box 21.

[0033] It should also be noted that the ammonia evaporator is a device used to convert liquid ammonia into gaseous ammonia. Its working principle is that liquid ammonia enters the pipe or coil in the evaporator through a pump or pressure difference, and exchanges heat with the heat source. In order to enable the heat source to provide precise temperature control while being safe and environmentally friendly, steam is used as the heat source. Liquid ammonia absorbs heat and quickly evaporates into ammonia gas, and is separated from the incompletely evaporated liquid in the built-in gas-liquid separator. The pure ammonia gas is then exported. As a mature existing technology, the ammonia evaporator will not be described in detail here.

[0034] The implementation scenario is specifically as follows: the dust-removed flue gas enters the temporary storage box 21 through the air inlet pipe 22, and then the flue gas in the temporary storage box 21 enters the connecting pipe 13, the ammonia evaporator is turned on, and the ammonia enters the hollow rotating blade 32 through the injection pipe 31, and then the nozzle 321 sprays ammonia, and the flue gas flows from bottom to top in the connecting pipe 13, and the ammonia sprayed from the nozzle 321 forms convection with the flow direction of the flue gas, so that the flue gas and the ammonia are fully contacted and reacted. After the nitrogen oxides in the flue gas react chemically with the ammonia, the flue gas enters the purification tower 1 through the connecting pipe 13, and the flue gas continues to move downward in the purification tower 1 under the guidance of the gas distributor 11 and fully reacts with the catalyst bed 12, and finally the flue gas reacts with the ammonia and the catalyst bed 12 to generate water and nitrogen that are discharged from the purification tower 1. Due to the load changes, combustion condition adjustments, dynamic characteristics of the process flow and environmental factors in the industrial production process, the gas entering the temporary storage box 21 will fluctuate significantly in a short period of time, that is, The gas entering the temporary storage box 21 will suddenly increase in a short period of time. After the sudden increase in flue gas, the amount of ammonia released cannot be dynamically adjusted according to the amount of flue gas entering. Less ammonia will lead to the inability to fully purify the flue gas, and more ammonia will cause ammonia escape. Therefore, a buffer component is set in the temporary storage box 21. When the flue gas entering the temporary storage box 21 suddenly increases in a short period of time, the air pressure in the temporary storage box 21 increases, and the piston plate 24 is pushed to slide upward in the closed buffer cylinder 23 under the action of the air pressure. The sliding of the piston plate 24 can increase the capacity of the temporary storage box 21, thereby reducing the air pressure in the temporary storage box 21. Even if the flue gas entering the temporary storage box 21 suddenly increases in a short period of time, the design of the piston plate 24 can stabilize the air pressure in the temporary storage box 21, so that the flue gas can stably enter the connecting pipe 13 in the temporary storage box 21, and the flue gas circulation and the ammonia release per unit time are always in a balanced state, thereby ensuring that the flue gas and ammonia can always react fully and efficiently.

[0035] Refer to the instruction manual Figure 2 and Figure 6A sudden increase in the amount of smoke in the temporary storage box 21 will instantly increase the air pressure in the temporary storage box 21. During the process of increasing the air pressure in the temporary storage box 21, the air pressure in the temporary storage box 21 is balanced by increasing the volume inside the temporary storage box 21. In order to further balance the smoke entering the connecting pipe 13 from the temporary storage box 21 to always maintain a relatively constant exhaust flow rate, specifically, an automatic balancing mechanism 4 is provided in the temporary storage box 21. The automatic balancing mechanism 4 includes a perforated frame plate 41. The perforated frame plate 41 is slidably arranged with the exhaust end of the temporary storage box 21. A rotating seat 43 is rotatably arranged in the temporary storage box 21. A connecting seat 42 is provided on the piston plate 24. The perforated frame plate 41 and the connecting seat 42 are both compatible with the rotating seat 43. A support shaft is fixedly provided at the bottom of the guide seat, a connecting seat 42 is fixedly provided with the support shaft, a connecting shaft 1 is fixedly provided at the bottom of the connecting seat 42, an auxiliary seat 1 is rotatably provided at the bottom end of the connecting shaft, and the auxiliary seat 1 is slidably provided on the rotating seat 43, a connecting shaft 2 is fixedly provided at the bottom of the perforated frame plate 41, an auxiliary seat 2 is rotatably provided at the bottom end of the connecting shaft 2, and the auxiliary seat 2 is slidably provided on the rotating seat 43.

[0036] It should be noted that the sleeve 131 is configured as a square plate structure, the perforated frame plate 41 slides in the sleeve 131, and the air holes provided on the perforated frame plate 41 are located at the side edge thereof close to the lower portion.

[0037] It should also be noted that when the amount of smoke entering the temporary storage box 21 suddenly increases, the piston plate 24 is pushed to move vertically in the closed buffer cylinder 23 under the action of air pressure. In the process of the piston plate 24 moving vertically upward, the connecting shaft 1 is driven to move vertically upward, and the connecting shaft 1 drives the rotating seat 43 to rotate clockwise. The rotating seat 43 rotates and drives the perforated frame plate 41 to move vertically downward in the sleeve 131 under the action of the connecting shaft 2. The perforated frame plate 41 moves vertically downward in the sleeve 131, which will cause the air vents opened on the perforated frame plate 41 to be located in the connecting pipe. 13, the effective area inside is reduced, that is, the vertical upward movement of the piston plate 24 can synchronously drive the air inlet end of the connecting pipe 13 to shrink, and adjust the size of the air inlet end opening to respond to the pressure change in the temporary storage box 21, to ensure that a relatively constant exhaust flow rate can be maintained under the condition of flue gas flow rate fluctuations, so that the flue gas and ammonia can fully react. When the piston plate 24 is reset and moves vertically downward, the rotating seat 43 rotates counterclockwise, and the connecting shaft 2 drives the perforated frame plate 41 to move vertically upward in the sleeve 131, thereby restoring the size of the opening of the air inlet end of the connecting pipe 13.

[0038] Refer to the instruction manual Figure 7 The temperature of flue gas generated by thermal power generation and chemical industries is usually high, which may reach 600°C, while the ideal reaction temperature of ammonia and flue gas is 280°C to 420°C. Therefore, the flue gas needs to be cooled in advance. Specifically, a heat exchange tube 5 is fixedly arranged in the temporary storage box 21, and a heat exchange liquid is arranged in the heat exchange tube 5. The heat exchange liquid flows in one direction in the heat exchange tube 5, and the heat exchange tube 5 is used to cool the gas in the temporary storage box 21.

[0039] It should be noted that a heat exchanger is fixedly installed at the bottom end of the heat exchange tube 5. The heat exchanger can make the heat exchange liquid flow in the heat exchange tube 5 and reduce the temperature of the heat exchange liquid. The heat exchange liquid circulates in the heat exchange tube 5 to reduce the temperature of the heat exchange tube 5. The heat exchange tube 5 can reduce the temperature of the flue gas in the temporary storage box 21. The cooperation between the heat exchanger and the heat exchange tube 5 is a mature existing technology and will not be elaborated on here.

[0040] Refer to the instruction manual Figure 7 and Figure 8 The flue gas generated by thermal power generation and chemical industries has a certain humidity due to the moisture contained in the fuel itself and the water vapor generated by the combination of hydrogen and oxygen in the combustion process. In addition, water used for cooling or other process requirements may also be mixed into the flue gas in the form of steam. These factors work together to make the unpurified flue gas usually have a certain humidity. Since the surface temperature of the heat exchange tube 5 is relatively low, the temperature of the gas entering the temporary storage box 21 is relatively high, and the heat exchange tube 5 absorbs the temperature of the flue gas through the circulation of the internal coolant. When the flue gas contains a certain humidity, condensed water will form on the surface of the heat exchange tube 5. The accumulation of condensed water in the temporary storage box 21 will reduce the gas in the temporary storage box 21. Capacity, thereby affecting the accuracy of automatic regulation of the piston plate 24 inside the temporary storage box 21 through air pressure. In order to solve this problem, specifically, an extension portion 211 is provided at the bottom of the temporary storage box 21, and a liquid discharge mechanism 6 is provided in the temporary storage box 21. The liquid discharge mechanism 6 includes a support plate 61, and the support plate 61 is slidably arranged in the extension portion 211. A linear driver 62 is fixedly arranged at the bottom of the extension portion 211, and the output end of the linear driver 62 is fixedly arranged on the support plate 61. A liquid level sensor 1 63 and a liquid level sensor 2 64 are fixedly arranged in the temporary storage box 21. The liquid level sensor 1 63 is located above the liquid level sensor 2 64, and an electromagnetic valve 65 is fixedly connected to the support plate 61.

[0041] It should be noted that the linear drive 62 is set as a cylinder, and the output end of the cylinder is fixed to the support plate 61. A single-chip microcomputer is set outside the temporary storage box 21, and the output ends of the linear drive 62 and the liquid level sensor 63 are connected to the input end of the single-chip microcomputer. The single-chip microcomputer can control the linear drive 62 and the solenoid valve 65 to start according to the data collected by the linear drive 62 and the liquid level sensor 63. The control principle of the single-chip microcomputer is a mature existing technology and will not be described in detail here.

[0042] It should also be noted that condensed water is formed after the flue gas contacts the heat exchange tube 5. Under the action of gravity, the condensed water falls on the surface of the support plate 61. As the condensed water accumulates, its liquid level height will gradually increase and then submerge the collecting end of the liquid level sensor 2 64. When the liquid level of the condensed water submerges the collecting end of the liquid level sensor 1 63, the linear drive 62 is started, and the output end of the linear drive 62 drives the support plate 61 to move vertically downward. When the collecting end of the liquid level sensor 1 63 is located above the liquid level of the condensed water and the liquid level sensor 2 64 is located in the condensed water, the output end of the linear drive 62 stops moving. By changing the horizontal height of the support plate 61, it is ensured that the liquid level of the condensed water is always located between the liquid level sensor 1 63 and the liquid level sensor 2 64, so as to avoid the condensed water occupying the capacity in the temporary storage box 21. A pressure sensor is set in the extension part 211, and the collecting end of the pressure sensor is located below the support plate 61. As the amount of condensed water in the temporary storage box 21 increases, the support plate 61 continues to move downward. When the bottom of the support plate 61 contacts the collecting end of the pressure sensor, the maximum stroke of the support plate 61 is reached, and the solenoid valve 65 is started. The solenoid valve 65 discharges the condensed water in the temporary storage box 21, and the collecting ends of the liquid level sensor 1 63 and the liquid level sensor 2 64 continue to collect the liquid level information of the condensed water. As the amount of condensed water in the temporary storage box 21 decreases, the output end of the linear drive 62 drives the support plate 61 to move upward. In this reciprocating manner, the condensed water in the temporary storage box 21 can be automatically discharged without stopping the machine, thereby avoiding the accumulation of condensed water occupying the capacity of the temporary storage box 21 and improving the purification efficiency.

[0043] Refer to the instruction manual Figure 3 and Figure 4 In order to improve the reaction efficiency of ammonia and flue gas, specifically, one end of the injection pipe 31 away from the hollow rotating blade 32 is fixedly connected to a pump 33, the air inlet end of the pump 33 is fixedly connected to the exhaust end of the ammonia evaporator, a transmission shaft is fixedly provided on the hollow rotating blade 32, a bevel gear 1 is fixedly provided on the transmission shaft, a rotating driver is fixedly provided on the connecting pipe 13, a bevel gear 2 is fixedly provided on the output shaft of the rotating driver, and the bevel gear 1 is meshed with the bevel gear 2.

[0044] It should be noted that the rotation driver is configured as a motor, and the output shaft of the motor is fixedly arranged with bevel gear 2. The rotation of the output shaft of the motor drives bevel gear 2 to rotate. Bevel gear 2 is meshed with bevel gear 1 to drive the hollow rotating blade 32 to rotate. The hollow rotating blade 32 rotates in the connecting pipe 13 so that the ammonia gas sprayed from the nozzle 321 is fully mixed with the flue gas flowing in the connecting pipe 13, thereby improving the reaction efficiency of purifying the flue gas.

[0045] It should also be noted that the blades on the hollow rotating blades 32 can also be driven by the wind force generated by the flow of smoke in the connecting pipe 13, thereby reducing the use of the driving source.

[0046] Refer to the instruction manual Fig. 9 , an accelerated diffusion denitration method for a steam denitration device, comprising the following steps: Step 1: The flue gas to be purified enters the temporary storage box 21 through the air inlet pipe 22 for temporary storage; Step 2: The amount of smoke entering the temporary storage box 21 suddenly increases, and under the action of air pressure, the piston plate 24 is pushed vertically upward in the closed buffer cylinder 23 to expand the volume of the temporary storage box 21, and at the same time reduce the effective area of ​​the exhaust end of the temporary storage box 21, and then the smoke enters the connecting pipe 13; Step 3: The ammonia gas sprayed out from the ammonia evaporator forms convection with the flue gas flowing in the connecting pipe 13, and the ammonia gas and the flue gas undergo a chemical reaction; Step 4: The flue gas continuously flows through the connecting pipe 13 into the purification tower 1 , and the gas distributor 11 disperses the flue gas and purifies the flue gas through the catalyst bed 12 , and finally generates nitrogen and water and discharges the purification tower 1 .

[0047] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A steam denitration device, characterized in that: The invention comprises a purification tower (1) and a flue gas temporary storage mechanism (2), wherein a gas distributor (11) and a catalyst bed (12) are arranged in the purification tower (1), and the flue gas temporary storage mechanism (2) comprises a temporary storage box (21), and an air inlet end of the purification tower (1) is fixedly connected to an exhaust end of the temporary storage box (21), and the flue gas enters the temporary storage box (21) and enters the purification tower (1) through the exhaust end of the temporary storage box (21); An injection mechanism (3) is provided at the exhaust end of the temporary storage box (21), the injection mechanism (3) comprising an injection pipe (31), the end of the injection pipe (31) being rotatably provided with a hollow rotating blade (32), an ammonia evaporator being provided at one end of the injection pipe (31) away from the hollow rotating blade (32), a nozzle (321) being provided on the hollow rotating blade (32), and ammonia gas ejected from the nozzle (321) forms convection with the flow direction of smoke in the exhaust end of the temporary storage box (21); A buffer component is arranged in the temporary storage box (21), and the buffer component comprises a closed buffer cylinder (23). The closed buffer cylinder (23) is fixedly arranged on the temporary storage box (21), and a piston plate (24) is slidably arranged in the closed buffer cylinder (23). The piston plate (24) increases the volume in the temporary storage box (21) by vertically moving upward in the closed buffer cylinder (23).

2. A steam denitration device according to claim 1, characterized in that: An automatic balancing mechanism (4) is arranged in the temporary storage box (21), and the automatic balancing mechanism (4) comprises a frame plate with holes (41), the frame plate with holes (41) is slidably arranged with the exhaust end of the temporary storage box (21), a rotating seat (43) is rotatably arranged in the temporary storage box (21), a connecting seat (42) is arranged on the piston plate (24), and the frame plate with holes (41) and the connecting seat (42) are both adapted to the rotating seat (43).

3. A steam denitration device according to claim 2, characterized in that: A heat exchange tube (5) is fixedly arranged in the temporary storage box (21), and a heat exchange liquid is arranged in the heat exchange tube (5). The heat exchange liquid flows in one direction in the heat exchange tube (5), and the heat exchange tube (5) is used to cool the gas in the temporary storage box (21).

4. A steam denitration device according to claim 3, characterized in that: An extension portion (211) is provided at the bottom of the temporary storage box (21), and a liquid accumulation discharge mechanism (6) is provided in the temporary storage box (21). The liquid accumulation discharge mechanism (6) comprises a support plate (61), and the support plate (61) is slidably provided in the extension portion (211). A linear drive (62) is fixedly provided at the bottom of the extension portion (211), and an output end of the linear drive (62) is fixedly provided with the support plate (61). A liquid level sensor 1 (63) and a liquid level sensor 2 (64) are fixedly provided in the temporary storage box (21), and the liquid level sensor 1 (63) is located above the liquid level sensor 2 (64). A solenoid valve (65) is fixedly connected to the support plate (61).

5. A steam denitration device according to claim 4, characterized in that: A guide seat is fixedly arranged in the closed buffer cylinder (23), a support seat is slidably arranged in the closed buffer cylinder (23), the support seat and the guide seat are slidably arranged, the piston plate (24) is fixedly arranged in the guide seat, and an elastic member (25) is arranged between the closed buffer cylinder (23) and the guide seat.

6. A steam denitration device according to claim 5, characterized in that: A support shaft is fixedly provided at the bottom of the guide seat, the connecting seat (42) is fixedly provided with the support shaft, a connecting shaft 1 is fixedly provided at the bottom of the connecting seat (42), an auxiliary seat 1 is rotatably provided at the bottom end of the connecting shaft, and the auxiliary seat 1 is slidably provided on the rotating seat (43), a connecting shaft 2 is fixedly provided at the bottom of the perforated frame plate (41), an auxiliary seat 2 is rotatably provided at the bottom end of the connecting shaft 2, and the auxiliary seat 2 is slidably provided on the rotating seat (43).

7. A steam denitration device according to claim 6, characterized in that: The air inlet end of the purification tower (1) is fixedly connected to a connecting pipe (13), a sleeve (131) is fixedly arranged in the connecting pipe (13), the perforated frame plate (41) is slidably arranged in the sleeve (131), one end of the connecting pipe (13) away from the purification tower (1) is fixedly connected to a temporary storage box (21), and one end of the temporary storage box (21) away from the connecting pipe (13) is fixedly connected to an air inlet pipe (22).

8. A steam denitration device according to claim 7, characterized in that: One end of the jet pipe (31) away from the hollow rotating blade (32) is fixedly connected to a pump (33), an air inlet end of the pump (33) is fixedly connected to an exhaust end of the ammonia evaporator, a transmission shaft is fixedly provided on the hollow rotating blade (32), a bevel gear 1 is fixedly provided on the transmission shaft, a rotary drive is fixedly provided on the connecting pipe (13), a bevel gear 2 is fixedly provided on the output shaft of the rotary drive, and the bevel gear 1 is meshed with the bevel gear 2.

9. A steam denitration device according to claim 8, characterized in that: A gas distributor (11) and a catalyst bed (12) are fixedly arranged in the purification tower (1), the gas distributor (11) is located above the catalyst bed (12), and a drainage pipe and an exhaust pipe are fixedly connected to the purification tower (1).

10. An accelerated diffusion denitration method for a steam denitration device as claimed in claim 9, characterized in that: The following steps are involved: Step 1: The flue gas to be purified enters the temporary storage box (21) through the air inlet pipe (22) for temporary storage; Step 2: The amount of smoke entering the temporary storage box (21) suddenly increases, and under the action of air pressure, the piston plate (24) is pushed vertically upward in the closed buffer cylinder (23) to expand the volume of the temporary storage box (21) and simultaneously reduce the effective area of ​​the exhaust end of the temporary storage box (21), and then the smoke enters the connecting pipe (13); Step 3: The ammonia gas sprayed out from the ammonia evaporator forms convection with the flue gas flowing in the connecting pipe (13), and the ammonia gas and the flue gas undergo a chemical reaction; Step 4: The flue gas continuously flows through the connecting pipe (13) into the purification tower (1), and the gas distributor (11) disperses the flue gas and purifies the flue gas through the catalyst bed (12), and finally generates nitrogen and water and discharges the purification tower (1).

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