Desulfurization and denitrification system and method for biomass combustion flue gas

Abstract

The invention discloses a biomass combustion flue gas desulfurization and denitrification system and method.The system comprises a denitrification device, a dust removal device, a purification device and a desulfurization device which are sequentially connected, a purification chamber and a treatment chamber which are distributed up and down are arranged in the purification device, and the purification chamber is filled with activated carbon particles; activated carbon particles are controlled to enter and exit through the top sealing assembly and the first blocking mechanism, the treatment chamber is used for conducting regeneration treatment on the activated carbon particles adsorbing flue gas impurities, and the material moving mechanism in the collecting chamber achieves cyclic utilization of the activated carbon particles. The biomass combustion flue gas purification device achieves the effect of efficiently purifying harmful substances in the biomass combustion flue gas.

Description

Technical Field

[0001] The present application relates to the field of flue gas purification and treatment, and in particular to a system and method for desulfurization and denitrification of biomass combustion flue gas. Background Art

[0002] Biomass combustion flue gas treatment is an important environmental protection field, involving a variety of technical means to reduce pollutant emissions. At present, a series of process flows are usually used to purify the harmful substances in the flue gas produced by biomass combustion, including dust removal, desulfurization and denitrification. These processes not only help protect the environment, but also improve energy efficiency and reduce the impact of environmental pollution on human health.

[0003] In the existing biomass combustion flue gas treatment technology, in order to effectively remove harmful components in the flue gas, the following methods are usually adopted: first, waste gas collection, which leads the waste gas out through the flue; second, dust removal, commonly used equipment includes cyclone dust collector, bag dust collector or electrostatic precipitator, etc., to remove solid particulate matter in the flue gas; then desulfurization, common desulfurization methods include wet desulfurization (such as limestone-gypsum method) and dry desulfurization (such as furnace calcium injection method), the main purpose of which is to reduce the emission concentration of SO2; in addition, there is denitrification, and commonly used methods include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), which aim to reduce the emission of nitrogen oxides; finally, in the entire treatment process, online monitoring equipment needs to be installed to monitor the emission indicators of waste gas in real time to ensure compliance with environmental protection standards.

[0004] However, the existing flue gas treatment technology has some shortcomings. Especially in the wet desulfurization process, since the smoke contains a lot of water, this will increase the water evaporation load of the desulfurization device, thereby affecting the desulfurization efficiency. At the same time, if the desulfurization is only carried out by the desulfurization device itself, its desulfurization efficiency is also subject to certain limitations and cannot fully meet the strict environmental protection requirements. Therefore, how to further optimize the flue gas treatment process on the existing basis and improve the desulfurization efficiency has become an urgent problem to be solved. Summary of the invention

[0005] In order to improve the efficiency of flue gas impurity treatment, the present application provides a desulfurization and denitrification system and method for biomass combustion flue gas.

[0006] The present application provides a biomass combustion flue gas desulfurization and denitrification system and method using the following technical solutions: A desulfurization and denitrification system for biomass combustion flue gas, comprising a denitrification device, a dust removal device, a purification device and a desulfurization device connected in sequence, wherein the purification device is provided with a purification chamber and a treatment chamber distributed up and down, wherein the purification chamber is connected between the dust removal device and the desulfurization device, wherein a mesh frame for filling activated carbon particles is provided in the purification chamber, and the purification device purifies flue gas impurities through the activated carbon particles; The upper and lower ends of the mesh frame are respectively connected to the top of the purification chamber and the top of the treatment chamber, the upper end opening of the mesh frame is open for activated carbon particles to enter, and the top of the purification chamber is provided with a capping assembly for controlling the opening and closing of the upper end opening of the mesh frame; The purification device is provided with a first blocking mechanism for controlling the opening and closing of the lower end opening of the mesh frame, the first blocking mechanism opens the lower end opening of the mesh frame to discharge the activated carbon particles into the treatment chamber, the treatment chamber is used to remove the flue gas impurities adsorbed by the activated carbon particles, so that the activated carbon particles can restore their adsorption capacity; A discharge port and a second blocking mechanism for controlling the opening and closing of the discharge port are provided at the bottom of the treatment chamber. When the activated carbon particles in the treatment chamber are treated, the second blocking mechanism opens the discharge port to discharge the treated activated carbon particles.

[0007] By adopting the above technical solution, a purification device is added between the dust removal device and the desulfurization device, and activated carbon particles are used to pre-treat the impurities in the flue gas. The activated carbon particles effectively reduce the humidity in the flue gas and reduce the load of water evaporation during the wet desulfurization process, thereby improving the desulfurization efficiency. The purification device is designed with a mesh frame and a capping assembly, which can easily replace the activated carbon particles to ensure that the activated carbon particles are always in the best working state and avoid the decrease in adsorption capacity due to long-term use. The design of the first plugging mechanism and the second plugging mechanism, as well as the design of the upper and lower distribution of the purification chamber and the treatment chamber can make full use of the gravity of the activated carbon particles, so that the activated carbon particles naturally fall into the treatment chamber during use, simplifying the replacement process and improving the convenience of operation, reducing manual operation, and improving the operation stability and safety of the system. At the same time, the activated carbon particles are regenerated in the treatment chamber, which effectively removes the flue gas impurities adsorbed by them and restores the adsorption capacity of the activated carbon particles, thereby ensuring the continuous and efficient operation of the system and improving the efficiency of flue gas impurity treatment.

[0008] Preferably, the interior of the purification device is also provided with a collecting chamber located below the treatment chamber, the collecting chamber is used to receive the treated activated carbon particles, the collecting chamber is provided with a discharge port for discharging the activated carbon particles, and a liftable material moving mechanism is provided on the outer side of the collecting chamber; when the activated carbon particles in the mesh frame are discharged into the treatment chamber, the activated carbon particles in the collecting chamber are discharged into the material moving mechanism through the discharge port, and the material moving mechanism moves the activated carbon particles up to the opening at the upper end of the mesh frame and pours them in, so as to achieve the purpose of replacing the activated carbon particles in the mesh frame.

[0009] By adopting the above technical solution, the collection chamber can effectively receive the treated activated carbon particles and discharge the activated carbon particles through the discharge port. The setting of the material transfer mechanism allows the activated carbon particles to be easily moved up to the opening at the upper end of the mesh frame and poured in, thereby realizing the automatic replacement of the activated carbon particles in the mesh frame.

[0010] Preferably, the material moving mechanism includes a material moving trough and a lifting drive component for driving the material moving trough to move up and down. A through opening is provided on the side of the material moving trough close to the purification device and a discharge hopper is hingedly connected to control the opening and closing of the through opening. When the material moving trough moves to the top position of the purification chamber, the discharge hopper opens the through opening of the material moving trough and is arranged on the opening edge of the upper end of the mesh frame in a downwardly inclined state. The activated carbon particles in the material moving trough fall into the interior of the mesh frame under the guidance of the discharge hopper.

[0011] By adopting the above technical solution, the material transfer mechanism can effectively re-introduce the treated activated carbon particles into the mesh frame, realizing the automatic replacement of activated carbon particles. Specifically, the material transfer trough is used in conjunction with the lifting drive to ensure that the material transfer trough can be accurately positioned at the top of the purification chamber. The design of the discharge hopper enables the activated carbon particles in the material transfer trough to flow smoothly into the mesh frame after reaching the designated position, avoiding transmission problems caused by accumulation or blockage, and improving the operating efficiency and stability of the system. At the same time, the inclined design of the discharge hopper also enhances the diversion effect, further ensuring the loading accuracy of the material transfer mechanism.

[0012] Preferably, both ends of the treatment chamber are connected with a liquid inlet pipe and a sewage pipe respectively, the liquid inlet pipe is connected with a liquid supply mechanism, the liquid supply mechanism is used to inject NaOH solution into the treatment chamber, and the sewage pipe is used to discharge sewage after the reaction in the treatment chamber.

[0013] By adopting the above technical solution, the two ends of the treatment chamber are connected with a liquid inlet pipe and a sewage pipe respectively, and the liquid inlet pipe is connected with a liquid supply mechanism, which is used to inject NaOH solution into the treatment chamber, so as to effectively remove the acidic substance SO2 and other harmful components adsorbed on the surface of the activated carbon particles, and improve the regeneration efficiency and service life of the activated carbon. At the same time, the treated sewage is discharged through the sewage pipe, ensuring that the waste liquid in the treatment process is effectively managed and treated to prevent secondary pollution.

[0014] Preferably, the liquid inlet pipe is connected to a water supply mechanism, and the water supply mechanism is used to inject clean water into the processing chamber to flush the inner wall of the processing chamber.

[0015] By adopting the above technical solution, injecting clean water into the processing chamber can effectively rinse the inner wall of the processing chamber, prevent residual impurities and pollutants from adhering to the inner wall, and ensure the cleanliness and efficiency of the processing process.

[0016] Preferably, both ends of the processing chamber are connected with an air inlet pipe and an exhaust pipe respectively, the liquid inlet pipe is connected with a drying mechanism, the drying mechanism is used to blow hot air into the processing chamber, and the exhaust pipe is used to discharge the gas in the processing chamber.

[0017] By adopting the above technical solution, the drying mechanism blows hot air into the processing chamber through the air inlet pipe, which can accelerate the evaporation of water on the surface and in the pores of the activated carbon particles, thereby drying the activated carbon particles faster, reducing their water content, and ensuring their adsorption performance. The gas in the processing chamber is discharged through the exhaust pipe, which not only helps to quickly take away the water, but also prevents water vapor from condensing on the inner wall of the processing chamber, thereby maintaining the cleanliness of the processing chamber.

[0018] Preferably, the capping assembly comprises a top cover for closing the top of the purification chamber, a sealing strip arranged at the bottom of the top cover and used to seal the upper opening of the mesh frame, and a lifting member for driving the top cover to move up and down.

[0019] By adopting the above technical solutions, the design of the capping assembly enables the top of the purification chamber to be effectively sealed to prevent smoke leakage, while ensuring the flexible opening and closing of the upper opening of the mesh frame. The setting of the blocking strip further enhances the sealing effect, ensuring that smoke will not escape when replacing activated carbon particles, improving the safety and environmental performance of the system. The use of the lifting piece realizes the automatic operation of the top cover, simplifies the maintenance process, and improves work efficiency.

[0020] Preferably, a method for desulfurization and denitrification of biomass combustion flue gas adopts a desulfurization and denitrification system for biomass combustion flue gas, comprising the following steps: By adopting the above technical solution, an activated carbon purification device is added between the dust removal device and the desulfurization device, and the activated carbon particles are used to adsorb impurities in the flue gas, thereby reducing the humidity and particulate matter content in the flue gas, thereby reducing the water evaporation load in the wet desulfurization process and improving the desulfurization efficiency. The mesh frame design in the purification device allows the activated carbon particles to be easily replaced and regenerated, ensuring the continuous and efficient use of activated carbon. Through the cooperation of the first plugging mechanism and the second plugging mechanism, and the up and down operation of the material transfer device on the activated carbon particles, the automatic management and recycling of the activated carbon particles are realized, the operation process is simplified, and the maintenance cost is reduced. The design of the material transfer mechanism makes the replacement of activated carbon particles more convenient and reliable. Through the coordinated work of the material transfer trough and the unloading hopper, it is ensured that the activated carbon particles are accurately introduced into the mesh frame, avoiding the errors and pollution that may be caused by manual operation. The pollutants on the activated carbon particles are effectively removed in the treatment chamber, its adsorption capacity is restored, and the service life of the activated carbon is extended.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. Adding an activated carbon purification device between the dust removal device and the desulfurization device can effectively reduce the humidity in the flue gas, reduce the water evaporation load during the wet desulfurization process, and improve the desulfurization efficiency; 2. Activated carbon particles can efficiently absorb impurities in flue gas, further purify the flue gas, reduce the burden of subsequent desulfurization equipment, and enhance the efficiency of the overall treatment system; 3. By designing a reasonable activated carbon particle replacement mechanism, ensure that the activated carbon continues to maintain good adsorption performance, extend its service life and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a desulfurization and denitrification system for biomass combustion flue gas in an embodiment of the present application.

[0023] Figure 2 This is a schematic diagram of the internal structure of a purification device in a biomass combustion flue gas desulfurization and denitrification system according to an embodiment of the present application. Figure 1 .

[0024] Figure 3 This is a schematic diagram of the internal structure of a purification device in a biomass combustion flue gas desulfurization and denitrification system according to an embodiment of the present application. Figure 2 .

[0025] Figure 4 It is a schematic diagram of the state when a material transfer chute is located at a starting position in a desulfurization and denitrification system for biomass combustion flue gas in an embodiment of the present application.

[0026] Figure 5 It is a schematic diagram of the state when a material transfer chute is located at the end position in a desulfurization and denitrification system for biomass combustion flue gas in an embodiment of the present application.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Denitrification device; 2. Dust removal device; 3. Purification device; 31. Purification chamber; 32. Treatment chamber; 321. Liquid inlet pipe; 322. Drain pipe; 323. Air inlet pipe; 324. Exhaust pipe; 325. Discharge port; 33. Collection chamber; 331. Discharge port; 34. Liquid supply mechanism; 35. Water supply mechanism; 4. Desulfurization device; 5. Net frame; 6. Capping assembly; 61. Top cover; 62. Sealing strip; 63. Lifting member; 7. First sealing mechanism; 71. First plugging strip; 72. First cylinder; 8. Second sealing mechanism; 81. Second plugging strip; 82. Second cylinder; 9. Material transfer mechanism; 91. Material transfer trough; 92. Lifting drive member; 93. Through port; 94. Discharge hopper. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] The present application embodiment discloses a biomass combustion flue gas desulfurization and denitrification system, referring to Figure 1 , including a denitrification device 1, a dust removal device 2, a purification device 3 and a desulfurization device 4 connected in sequence. The denitrification device 1, the dust removal device 2 and the desulfurization device 4 are all commonly used equipment in the flue gas desulfurization and denitrification system. The denitrification device 1 includes a denitrification reactor, an ammonia unit, a hot air furnace unit, etc. These devices act together on the flue gas to reduce the nitrogen oxides therein, thereby achieving the purpose of denitrification. The dust removal device 2 adopts the principle of electrostatic dust removal, and the desulfurization device 4 adopts the principle of wet desulfurization.

[0030] Reference Figure 1 and Figure 2 In this embodiment, the purification device 3 is provided with a purification chamber 31 and a processing chamber 32 which are distributed vertically. The purification chamber 31 is connected between the dust removal device 2 and the desulfurization device 4. A mesh frame 5 for filling activated carbon particles is provided in the purification chamber 31. The windward side and the leeward side of the mesh frame 5 are both in a grid shape, which has a very high ventilation effect. In this embodiment, the direction of the line connecting the two ends of the purification chamber 31 is the longitudinal direction. The flue gas discharged from the dust removal device 2 is longitudinally passed into the purification chamber 31 through the smoke inlet pipe, and the flue gas passes longitudinally through the mesh frame 5. The activated carbon particles inside the mesh frame 5 purify the flue gas impurities.

[0031] Specifically, the main function of the purification device 3 is to add a purification link between the dust removal device 2 and the desulfurization device 4, and remove part of the water and harmful substances in the flue gas through activated carbon particles, thereby reducing the workload of the subsequent desulfurization device 4 and improving the desulfurization efficiency of the overall system. This design can not only effectively reduce the water evaporation load during the wet desulfurization process, but also extend the service life of the desulfurization device 4 and reduce operating costs.

[0032] Reference Figure 2 and Figure 3 In this embodiment, both upper and lower ends of the mesh frame 5 are opened and connected to the top of the purification chamber 31 and the top of the treatment chamber 32 respectively. The upper end opening of the mesh frame 5 allows the activated carbon particles to enter. A capping assembly 6 for controlling the opening and closing of the upper end opening of the mesh frame 5 is provided at the top of the purification chamber 31. The capping assembly 6 includes a top cover 61 for closing the top of the purification chamber 31, a blocking strip 62 fixed at the middle position of the bottom of the top cover 61 and used to block the upper end opening of the mesh frame 5, and a lifting member 63 for driving the top cover 61 to move up and down. The lifting member 63 can be installed and fixed above the outer shell of the purification device 3. The lifting member 63 can also be a hydraulic cylinder or an electric push rod, and the capping function is realized by driving the top cover 61 to move up and down.

[0033] In this embodiment, the purification device 3 is provided with a first plugging mechanism 7 for controlling the opening and closing of the lower end opening of the mesh frame 5. The first plugging mechanism 7 opens the lower end opening of the mesh frame 5 to discharge the activated carbon particles into the treatment chamber 32. Specifically, the first plugging mechanism 7 includes a first cylinder 72 arranged vertically and a first plugging strip 71 fixed to the top of the piston rod of the first cylinder 72. The first plugging strip 71 extends laterally to adapt to the lateral width of the lower end opening of the mesh frame 5. The bottom of the first plugging strip 71 is a rigid plate to ensure that the supporting force of the first cylinder 72 is evenly distributed to the first plugging strip 71 to improve the sealing of the lower end opening of the mesh frame 5.

[0034] In this embodiment, the treatment chamber 32 is used to remove the flue gas impurities adsorbed by the activated carbon particles so that the activated carbon particles can restore their adsorption capacity. Specifically, the two ends of the treatment chamber 32 are respectively connected with a liquid inlet pipe 321 and a sewage pipe 322, and the liquid inlet pipe 321 is connected with a liquid supply mechanism 34, which is used to inject NaOH solution into the treatment chamber 32 to regenerate the activated carbon particles. The liquid supply mechanism 34 can adopt a pumping system, and by adjusting the speed and pressure of the pump, the inflow and speed of the NaOH solution can be accurately controlled to ensure the stability and effectiveness of the treatment process.

[0035] The liquid inlet pipe 321 is connected to a water supply mechanism 35, which is used to inject clean water into the treatment chamber 32 for flushing the inner wall of the treatment chamber 32. The water supply mechanism 35 adopts a conventional water supply system, specifically including a water tank, a water pump and a water pipe. Through the pumping action of the water pump, the water in the water tank is pumped into the treatment chamber 32 to complete the flushing of the residual liquid on the surface of the activated carbon particles and the inner wall of the treatment chamber 32 to keep it clean. Sewage can be discharged through the sewage pipe 322. In order to improve the sewage discharge efficiency, a suction pump can be installed in the sewage pipe 322 for suction and discharge.

[0036] The two ends of the processing chamber 32 are also connected with an air inlet pipe 323 and an exhaust pipe 324. The air inlet pipe 323 is connected with a drying mechanism (not shown in the figure). The drying mechanism is composed of a hot air machine. The drying mechanism blows hot air into the processing chamber 32 to accelerate the drying process of the activated carbon particles so that the water on the surface of the activated carbon particles evaporates. The exhaust pipe 324 is used to exhaust the gas in the processing chamber 32 to maintain the pressure in the processing chamber 32.

[0037] A discharge port 325 and a second plugging mechanism 8 for controlling the opening and closing of the discharge port 325 are provided at the bottom of the treatment chamber 32, wherein the inner bottom wall of the treatment chamber 32 is V-shaped, and the discharge port 325 is a longitudinally extending long hole and is located at the lowest position of the treatment chamber 32. Specifically, the first plugging mechanism 7 includes a second cylinder 82 arranged vertically and a second plug 81 fixed to the top of the piston rod of the second cylinder 82, the second plug 81 extends longitudinally to adapt to the longitudinal length of the discharge port 325, and the bottom of the second plug 81 is a rigid plate to ensure that the supporting force of the second cylinder 82 is evenly distributed to the second plug 81 to improve the sealing of the discharge port 325. The surface of the second plug 81 is coated with an alkali-resistant protective coating, such as epoxy resin, to reduce the probability of corrosion. When the activated carbon particles in the treatment chamber 32 are treated, the second plugging mechanism 8 opens the discharge port 325 to discharge the treated activated carbon particles downward.

[0038] In this embodiment, the first cylinder 72 and the second cylinder 82 are distributed in the longitudinal direction, and the piston rod of the first cylinder 72 passes through the second plugging strip 81, so that the operations of the first blocking mechanism 7 and the second blocking mechanism 8 do not affect each other.

[0039] In this embodiment, the interior of the purification device 3 is further provided with a collection chamber 33 located below the treatment chamber 32, the collection chamber 33 is used to receive the treated activated carbon particles, the collection chamber 33 is provided with a discharge port 331 for the activated carbon particles to be discharged, the inner bottom wall of the collection chamber 33 is V-shaped, and is inclined downward in the direction of the discharge port 331, so as to ensure that the activated carbon particles in the collection chamber 33 can be discharged from the discharge port 331 by their own gravity, thereby improving the discharge efficiency of the collection chamber 33. In addition, a vibrator can be installed outside the purification device 3 to ensure that the activated carbon can be completely transferred.

[0040] Reference Figure 4 and Figure 5 In this embodiment, a lifting material transfer mechanism 9 is provided outside the collection chamber 33. When the activated carbon particles in the mesh frame 5 are discharged into the processing chamber 32, the activated carbon particles in the collection chamber 33 are discharged into the material transfer mechanism 9 through the discharge port 331, and the material transfer mechanism 9 moves the activated carbon particles upward to the opening at the upper end of the mesh frame 5 and pours them into the mesh frame 5, so as to achieve the purpose of replacing the activated carbon particles in the mesh frame 5.

[0041] Specifically, the material moving mechanism 9 includes a material moving trough 91 and a lifting drive member 92 for driving the material moving trough 91 to move up and down, and the lifting drive member 92 is specifically a vertical screw transmission mechanism. The material moving trough 91 slides closely against the outer wall of the collection chamber 33, the outer wall of the treatment chamber 32, and the outer wall of the purification chamber 31. The upper end of the material moving trough 91 is open. Among them, the starting position of the material moving trough 91 is located below the discharge port 331, and the end position is higher than the top of the purification chamber 31. Among them, the bottom of the material moving trough 91 close to the purification device 3 is provided with a through opening 93 and a discharge hopper 94 hinged to control the opening and closing of the through opening 93, and the discharge hopper 94 is driven by a conventional motor (not shown in the figure) installed inside the material moving trough 91.

[0042] In this embodiment, the inner bottom wall of the material transfer trough 91 is V-shaped and tilted downward toward the opening 93 to ensure that the activated carbon particles in the material transfer trough 91 can be discharged from the opening 93 by their own gravity, thereby improving the discharge efficiency of the material transfer trough 91.

[0043] Before the material transfer trough 91 moves to the top of the purification chamber 31, the discharge hopper 94 is always in a state of closing the opening 93. When the material transfer trough 91 moves to the top of the purification chamber 31 and the opening 93 is higher than the upper opening of the screen frame 5, the top cover 61 on the top of the purification chamber 31 is opened under the lifting action of the lifting member 63, and the blocking strip 62 opens the upper opening of the screen frame 5. At this time, the motor drives the discharge hopper 94 to flip downward to open the opening 93 of the material transfer trough 91, and the discharge hopper 94 is tilted downward to the edge of the upper opening of the screen frame 5. The activated carbon particles in the material transfer trough 91 fall into the inside of the screen frame 5 under the diversion action of the discharge hopper 94, ensuring that the activated carbon particles are accurately introduced into the screen frame 5. In order to reduce the situation where the activated carbon particles roll down to the sides of the discharge hopper 94 during the material guiding process, the height of the guard plates on both sides of the discharge hopper 94 can be increased so that all the activated carbon particles can roll down into the screen frame 5.

[0044] This embodiment is a method for desulfurization and denitrification of biomass combustion flue gas, using the desulfurization and denitrification system described above. The specific steps are as follows: a) The exhaust port of the boiler and other equipment is directly connected to the denitrification device 1, so that the biomass combustion flue gas to be treated is introduced into the denitrification device 1 for denitrification treatment.

[0045] b) The flue gas after denitrification treatment enters the dust removal device 2 for dust removal treatment.

[0046] c) After dust removal, the flue gas enters the purification chamber 31 of the purification device 3. The purification chamber 31 is provided with a mesh frame 5 filled with activated carbon particles. The flue gas contacts the activated carbon particles to remove impurities therein.

[0047] d) When the adsorption capacity of the activated carbon particles in the mesh frame 5 drops to a level that cannot meet the purification requirements, the first blocking mechanism 7 is activated, and the first cylinder 72 drives the first plugging bar 71 downward to open the lower end opening of the mesh frame 5, thereby discharging the activated carbon particles into the treatment chamber 32.

[0048] e) The treatment chamber 32 is injected with NaOH solution through the liquid supply mechanism 34 to regenerate the activated carbon particles. After the activated carbon particles are soaked in the NaOH solution for 2-3 hours (during the soaking process, the drying mechanism can be used to appropriately introduce hot air to heat the reaction solution, which can shorten the treatment time), the treated sewage is discharged through the sewage pipe 322. Then, the water supply mechanism 35 is used to introduce clean water into the treatment chamber 32 to flush the sewage remaining on the inner wall of the treatment chamber 32 and the surface of the activated carbon particles. Finally, hot air is introduced into the treatment chamber 32 through the drying mechanism to evaporate the water on the inner wall of the treatment chamber 32 and the surface of the activated carbon particles.

[0049] f) After the activated carbon particles are regenerated, the second plugging mechanism 8 is activated, and the second cylinder 82 drives the second plugging bar 81 to move downward, opening the discharge port 325 at the bottom of the treatment chamber 32 to discharge the treated activated carbon particles into the collection chamber 33.

[0050] g) The activated carbon particles in the collection chamber 33 are discharged into the material transfer trough 91 of the material transfer mechanism 9 through the discharge port 331. The lifting drive member 92 of the material transfer mechanism 9 is started to drive the material transfer trough 91 to move upward, and the activated carbon particles are lifted to the top of the purification chamber 31. The top cover 61 on the top of the purification chamber 31 is opened under the lifting action of the lifting member 63, and the blocking strip 62 opens the upper opening of the net frame 5. At this time, the motor drives the discharge hopper 94 to flip downward to open the opening 93 of the material transfer trough 91, and the discharge hopper 94 is set on the upper opening edge of the net frame 5 in a tilted downward state. The activated carbon particles in the material transfer trough 91 fall into the inside of the net frame 5 under the diversion action of the discharge hopper 94, ensuring that the activated carbon particles are accurately introduced into the net frame 5, and the replacement of the activated carbon particles is completed. Then, the top cover 61 closes the upper end of the purification chamber 31 and seals it under the downward push action of the lifting member 63, and the blocking strip 62 blocks the upper opening of the net frame 5.

[0051] h) The replaced activated carbon particles continue to purify the new flue gas, and the purified flue gas enters the desulfurization device 4 for desulfurization treatment.

[0052] It should be emphasized that the work of the purification chamber 31 and the work of the treatment chamber 32 can be carried out simultaneously, that is, by preparing two batches of activated carbon particles, when the activated carbon particles to be treated are regenerated in the treatment chamber 32, new activated carbon particles can be poured into the mesh frame 5 to ensure that the flue gas purification work in the purification chamber 31 can continue. When the adsorption capacity of the activated carbon particles in the mesh frame 5 drops to the point where it cannot meet the purification requirements, the activated carbon particles that have completed the regeneration treatment in the treatment chamber 32 and the activated carbon particles in the mesh frame 5 can be automatically replaced with each other under the cooperation of the material moving mechanism 9, the first sealing mechanism 7 and the second sealing mechanism 8.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A desulfurization and denitrification system for biomass combustion flue gas, characterized in that: The invention comprises a denitration device (1), a dust removal device (2), a purification device (3) and a desulfurization device (4) which are connected in sequence, wherein the purification device (3) is provided with a purification chamber (31) and a treatment chamber (32) which are arranged vertically, the purification chamber (31) is connected between the dust removal device (2) and the desulfurization device (4), a mesh frame (5) for filling activated carbon particles is provided in the purification chamber (31), and the purification device (3) purifies flue gas impurities by means of the activated carbon particles; The upper and lower ends of the mesh frame (5) are respectively connected to the top of the purification chamber (31) and the top of the treatment chamber (32); the upper opening of the mesh frame (5) allows the activated carbon particles to enter; and a capping component (6) for controlling the opening and closing of the upper opening of the mesh frame (5) is provided at the top of the purification chamber (31); The purification device (3) is provided with a first blocking mechanism (7) for controlling the opening and closing of the lower end opening of the mesh frame (5); the first blocking mechanism (7) opens the lower end opening of the mesh frame (5) to discharge the activated carbon particles into the treatment chamber (32); the treatment chamber (32) is used to remove flue gas impurities adsorbed by the activated carbon particles, so that the activated carbon particles can restore their adsorption capacity; The bottom of the processing chamber (32) is provided with a discharge port (325) and a second blocking mechanism (8) for controlling the opening and closing of the discharge port (325); when the activated carbon particles in the processing chamber (32) are processed, the second blocking mechanism (8) opens the discharge port (325) to discharge the processed activated carbon particles.

2. The desulfurization and denitrification system for biomass combustion flue gas according to claim 1, characterized in that: The purification device (3) is further provided with a collecting chamber (33) located below the treatment chamber (32). The collecting chamber (33) is used to receive the activated carbon particles after treatment. The collecting chamber (33) is provided with a discharge port (331) for discharging the activated carbon particles. A liftable material transfer mechanism (9) is provided outside the collecting chamber (33). When the activated carbon particles in the mesh frame (5) are discharged into the treatment chamber (32), the activated carbon particles in the collecting chamber (33) are discharged into the material transfer mechanism (9) through the discharge port (331). The material transfer mechanism (9) moves the activated carbon particles upward to the upper opening of the mesh frame (5) and pours them into the mesh frame, thereby achieving the purpose of replacing the activated carbon particles in the mesh frame (5).

3. The desulfurization and denitrification system for biomass combustion flue gas according to claim 2, characterized in that: The material transfer mechanism (9) comprises a material transfer trough (91) and a lifting drive member (92) for driving the material transfer trough (91) to move up and down. A through opening (93) and a discharge hopper (94) are hingedly connected on a side of the material transfer trough (91) close to the purification device (3) for controlling the opening and closing of the through opening (93). When the material transfer trough (91) moves to the top position of the purification chamber (31), the discharge hopper (94) opens the through opening (93) of the material transfer trough (91) and is placed on the upper opening edge of the mesh frame (5) in a tilted downward state. The activated carbon particles in the material transfer trough (91) fall into the interior of the mesh frame (5) under the guidance of the discharge hopper (94).

4. The desulfurization and denitrification system for biomass combustion flue gas according to claim 1, characterized in that: The two ends of the treatment chamber (32) are respectively connected to a liquid inlet pipe (321) and a sewage discharge pipe (322); the liquid inlet pipe (321) is connected to a liquid supply mechanism (34); the liquid supply mechanism (34) is used to inject NaOH solution into the treatment chamber (32); and the sewage discharge pipe (322) is used to discharge sewage after reaction in the treatment chamber (32).

5. The desulfurization and denitrification system for biomass combustion flue gas according to claim 4, characterized in that: The liquid inlet pipe (321) is connected to a water supply mechanism (35), and the water supply mechanism (35) is used to inject clean water into the treatment chamber (32) to flush the inner wall of the treatment chamber (32).

6. The desulfurization and denitrification system for biomass combustion flue gas according to claim 5, characterized in that: The two ends of the processing chamber (32) are respectively connected to an air inlet pipe (323) and an exhaust pipe (324); the liquid inlet pipe (321) is connected to a drying mechanism, the drying mechanism is used to blow hot air into the processing chamber (32); the exhaust pipe (324) is used to discharge the gas in the processing chamber (32).

7. The biomass combustion flue gas desulfurization and denitrification system according to claim 1, characterized in that: The capping assembly (6) comprises a top cover (61) for sealing the top of the purification chamber (31), a blocking strip (62) arranged at the bottom of the top cover (61) and used to block the upper opening of the net frame (5), and a lifting member (63) for driving the top cover (61) to move up and down.

8. A method for desulfurization and denitrification of biomass combustion flue gas, using the desulfurization and denitrification system as claimed in claim 3, characterized in that: The following steps are involved: a) introducing the biomass combustion flue gas to be treated into a denitrification device (1) for denitrification treatment; b) The flue gas after denitration treatment enters the dust removal device (2) for dust removal treatment; c) After dust removal, the flue gas enters the purification chamber (31) of the purification device (3). A mesh frame (5) filled with activated carbon particles is provided in the purification chamber (31). The flue gas contacts the activated carbon particles to remove impurities therein; d) when the activated carbon particles need to be replaced, the first blocking mechanism (7) is activated, the lower opening of the mesh frame (5) is opened, and the activated carbon particles are discharged into the treatment chamber (32); e) a treatment chamber (32) for regenerating the activated carbon particles; f) After the activated carbon particles are regenerated, the second blocking mechanism (8) is activated to open the discharge port (325) at the bottom of the treatment chamber (32) to discharge the treated activated carbon particles into the collection chamber (33); g) The activated carbon particles in the collection chamber (33) are discharged into the material transfer mechanism (9) through the discharge port (331), and the material transfer mechanism (9) lifts the activated carbon particles to the top of the purification chamber (31), and re-introduces the activated carbon particles into the mesh frame (5) through the discharge hopper (94), thereby completing the replacement of the activated carbon particles; h) The replaced activated carbon particles continue to purify the new flue gas, and the purified flue gas enters the desulfurization device (4) for desulfurization treatment.

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