Denitration device for flue gas of biomass boiler

Abstract

The utility model provides a denitration device for biomass boiler flue gas, which belongs to the technical field of biomass boiler denitration, and comprises a denitration tank, the top end of the denitration tank is detachably connected with a tank cover through a bolt assembly, two denitration structures are symmetrically arranged on the tank cover, one side of the denitration tank is provided with a connecting sleeve, and the other side of the denitration tank is provided with a plurality of denitration structures. The upper end face of the connecting sleeve is fixedly connected with a gas conveying pipe, the gas conveying pipe penetrates through the denitration tank and extends into the denitration tank, the inner top wall of the connecting sleeve is detachably connected with a filter cylinder through a bolt, and the peripheral side wall of the filter cylinder is fixedly connected with a cloth bag. Through the arrangement of the filter cylinder, the cloth bag, the bottom cylinder, the first motor, the connecting shaft, the mounting head, the cleaning brush and the nut, dust in the flue gas of the biomass boiler is filtered, the dust on the cloth bag is conveniently cleaned, subsequent flue gas filtration is facilitated, disassembly and replacement are facilitated, the practicability is higher, and the practicability is higher. The problem that in the prior art, a dust suction plate is prone to being blocked, and the follow-up filtering effect is affected is solved.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology for biomass boilers, and more specifically, to a denitrification device for flue gas from biomass boilers. Background Technology

[0002] my country is a major energy consumer, and the extensive use of fossil fuels has led to energy shortages and environmental degradation. Therefore, sustainable, low-pollution, and low-energy-consumption new energy sources are urgently needed. Biomass energy, as a sustainable and low-pollution new fuel, has already occupied an important position in boiler fuels. By 2010, China's installed capacity of biomass power generation will exceed 3000MW. Biomass is a renewable resource with large production volumes, achieving low carbon dioxide emissions, which meets the requirements of a low-carbon economy. Compared to pulverized coal, biomass contains almost no sulfur, so SO2 emissions in flue gas are also lower than the highest environmental protection requirements. However, biomass fuel has a nitrogen content of 1.2%-2.5%, and the NOx emission concentration in flue gas after boiler combustion is generally 250-350 mg / Nm3. Therefore, when using biomass as fuel, boiler environmental protection measures do not need to worry about pollution, but the pollution caused by NOx in the flue gas needs to be controlled and treated. With the increasingly stringent environmental protection situation in my country, most biomass boilers are implemented in accordance with the environmental protection requirements for boiler power plants. However, it is difficult to achieve <100mg / Nm3, or even <50mg / Nm3 for ultra-clean emissions in key areas, through traditional denitrification processes.

[0003] A search revealed that patent application CN201920350715.8 discloses a biomass boiler denitrification device, including a base, a denitrification box, an air inlet pipe, a flue gas filtration mechanism, a denitrification tank, a temperature sensor, a protective cover, a control module, a drain pipe, an inlet pipe, and a stirring shaft. The denitrification box is fixedly installed on the upper side of the base, and an air inlet pipe is provided on the lower right side of the denitrification box. This invention utilizes a flue gas filtration mechanism located on the left side of the air inlet pipe to adsorb dust from the flue gas, preventing dust from entering the denitrification tank, wasting denitrification liquid, causing resource waste, and increasing costs. The temperature sensor can detect the temperature inside the denitrification tank, and the heating element can heat the denitrification liquid, ensuring a complete reaction and improving denitrification efficiency. The stirring shaft can uniformly stir the denitrification liquid, further improving denitrification efficiency. The first and second denitrification layers can further improve denitrification efficiency and reduce costs. However, the following drawbacks still exist:

[0004] (1) The existing denitrification device uses a dust suction plate to filter dust in the flue gas. The dust suction plate is easy to get clogged during use and is inconvenient to clean, which affects the subsequent filtration effect.

[0005] Existing denitrification devices use a first denitrification layer and a second denitrification layer to denitrify flue gas. However, the first and second denitrification layers are prone to failure after long-term use and are inconvenient to replace.

[0006] Therefore, we have made improvements to this and proposed a denitrification device for biomass boiler flue gas. Summary of the Invention

[0007] The purpose of this invention is to address the problems of clogging of the dust suction plate affecting subsequent flue gas filtration and the inconvenience of replacing the descaling layer.

[0008] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0009] Denitrification devices for flue gas from biomass boilers are used to improve the above-mentioned problems.

[0010] The present invention is as follows:

[0011] The device includes a de-pinning tank, the top of which is detachably connected to a tank lid via a bolt assembly. Two de-pinning structures are symmetrically arranged on the tank lid. A connecting sleeve is provided on one side of the de-pinning tank, and an air supply pipe is fixedly connected to the upper end of the connecting sleeve. The air supply pipe penetrates the de-pinning tank and extends into its interior. A filter cartridge is detachably connected to the inner top wall of the connecting sleeve via bolts. A cloth bag is fixedly connected to the outer peripheral side wall of the filter cartridge. A bottom cylinder is detachably connected to the connecting sleeve via a bolt assembly. An air inlet pipe is fixedly connected to the side wall of the bottom cylinder. A first motor is fixedly connected to the lower end of the bottom cylinder. The drive end of the first motor penetrates the bottom cylinder and is fixedly connected to a connecting shaft. An installation head is fixedly connected to the top of the connecting shaft. A cleaning brush is inserted into the installation head, and a nut is threaded onto the installation head. A stirring structure is provided on the tank lid.

[0012] As a preferred technical solution of this utility model, the pin-removing structure includes two symmetrically opened circular holes on the can lid, and each circular hole is provided with an installation tube. The installation tube is fixedly connected to the can lid. A connecting frame is provided inside the installation tube. A first pin-removing layer and a second pin-removing layer are fixedly connected inside the connecting frame. The upper end face of the connecting frame is symmetrical and fixedly connected with two locking blocks. Two locking grooves matching the locking blocks are symmetrically opened on the installation tube. A handle is fixedly connected to the upper end face of the connecting frame. A set of vent holes is evenly opened at the bottom of the installation tube. The top end of the installation tube is connected to a top plate by a bolt assembly. The lower end face of the top plate is symmetrical and fixedly connected with two abutments.

[0013] As a preferred technical solution of this utility model, the stirring structure includes a second motor fixed on the upper surface of the tank cover, the drive end of the second motor passing through the tank cover and fixedly connected to a stirring shaft, and a set of stirring paddles being uniformly fixedly connected on the stirring shaft.

[0014] As a preferred technical solution of this utility model, a heating jacket is fixedly connected to the outer peripheral side wall of the denitrification tank, and a set of heating tubes are evenly installed inside the heating jacket.

[0015] As a preferred technical solution of this utility model, a drain pipe is fixedly connected to the bottom end of the denitrification tank, a first control valve is installed at the bottom end of the drain pipe, a sewage pipe is fixedly connected to the side wall of the bottom cylinder, and a second control valve is installed at the bottom end of the sewage pipe.

[0016] As a preferred technical solution of this utility model, the bottom of the de-pinning tank is uniformly and fixedly connected with four support legs.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In the solution of this utility model:

[0019] 1. By setting up a filter cartridge, cloth bag, bottom cylinder, first motor, connecting shaft, mounting head, cleaning brush and nut, the dust in the flue gas of biomass boiler is filtered, which facilitates the cleaning of dust on the cloth bag, facilitates subsequent flue gas filtration, and is easy to disassemble and replace, making it more practical and solving the problem of easy clogging of the ash suction plate in the existing technology, which affects the subsequent filtration effect.

[0020] 2. The de-pinning structure enables multiple de-pinning of the flue gas, facilitating installation and disassembly, and making it easy to replace the de-pinning layer later. This solves the problem of inconvenience in replacing the de-pinning layer in existing technologies. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 A schematic diagram of the internal structure of the bottom cylinder provided by this utility model;

[0024] Figure 4 A schematic diagram of the cleaning brush separation structure provided by this utility model;

[0025] Figure 5 A schematic diagram of the pin-removing structure provided by this utility model;

[0026] Figure 6 This is a front view structural diagram of the present invention.

[0027] The image shows:

[0028] 1. Pin removal tank; 2. Tank lid; 3. Pin removal structure; 301. Mounting pipe; 302. Connecting frame; 303. First pin removal layer; 304. Second pin removal layer; 305. Locking block; 306. Locking groove; 307. Handle; 308. Air outlet; 309. Top plate; 3010. Support column; 4. Connecting sleeve; 5. Air supply pipe; 6. Filter cartridge; 7. Cloth bag; 8. Bottom cylinder; 9. Air inlet pipe; 10. First motor; 11. Connecting shaft; 12. Mounting head; 13. Cleaning brush; 14. Nut; 15. Stirring structure; 1501. Second motor; 1502. Stirring shaft; 1503. Stirring paddle; 16. Heating jacket; 17. Heating pipe; 18. Drain pipe; 19. First control valve; 20. Sewage pipe; 21. Second control valve; 22. Support leg. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this embodiment proposes a denitrification device for biomass boiler flue gas, including a denitrification tank 1. A tank cover 2 is detachably connected to the top of the denitrification tank 1 via a bolt assembly. Two denitrification structures 3 are symmetrically arranged on the tank cover 2. A connecting sleeve 4 is provided on one side of the denitrification tank 1. An air supply pipe 5 is fixedly connected to the upper end face of the connecting sleeve 4, penetrating the denitrification tank 1 and extending into its interior. A filter cartridge 6 is detachably connected to the inner top wall of the connecting sleeve 4 via bolts. A cloth bag 7 is fixedly connected to the outer peripheral side wall of the filter cartridge 6. A bottom cylinder 8 is detachably connected to the connecting sleeve 4 via a bolt assembly. An air inlet pipe 9 is fixedly connected to the side wall of the bottom cylinder 8. A first motor 10 is fixedly connected to the lower end face of the bottom cylinder 8. The drive end of the first motor 10 penetrates the bottom cylinder 8 and is fixed. A connecting shaft 11 is connected, and an installation head 12 is fixedly connected to the top of the connecting shaft 11. A cleaning brush 13 is inserted into the installation head 12, and a nut 14 is threaded onto the installation head 12. A stirring structure 15 is provided on the tank cover 2. It is worth noting that the denitrification tank 1 is provided with a liquid addition pipe for adding denitrification liquid, which is not shown in the figure. The flue gas enters the bottom cylinder 8 through the air inlet pipe 9. The filter bag 7 filters the dust in the flue gas. The filtered flue gas enters the denitrification tank 1 and comes into contact with the denitrification liquid to denitrify the flue gas. When the filter bag 7 needs to be cleaned, the first motor 10 drives the connecting shaft 11 and the installation head 12 to install, thereby causing the cleaning brush 13 to rotate, thereby cleaning the filter bag 7, which facilitates subsequent flue gas filtration.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, in a preferred embodiment, based on the above method, the de-pin structure 3 further includes two symmetrically opened circular holes on the can lid 2, and each circular hole is provided with an installation tube 301. The installation tube 301 is fixedly connected to the can lid 2. A connecting frame 302 is provided inside the installation tube 301. A first de-pin layer 303 and a second de-pin layer 304 are fixedly connected inside the connecting frame 302. Two locking blocks 305 are symmetrically connected to the upper end face of the connecting frame 302. Two locking grooves 306 that match the locking blocks 305 are symmetrically opened on the installation tube 301. A handle 307 is fixedly connected to the upper end face of the connecting frame 302. A set of air outlets 308 are evenly distributed at the bottom. The top end of the mounting pipe 301 is connected to the top plate 309 by bolt assembly. The lower end of the top plate 309 is symmetrical and fixedly connected to two abutments 3010. The flue gas can be denitrified and purified again through the first denitrification layer 303 and the second denitrification layer 304. The locking block 305 and the locking groove 306 realize the quick and stable connection between the connecting frame 302 and the mounting pipe 301, which is convenient for installation and disassembly. The handle 307 makes it easy for the operator to take out the connecting frame 302 for replacement or maintenance. The air outlets 308 facilitate the discharge of the denitrified gas, thereby facilitating the replacement of the first denitrification layer 303 and the second denitrification layer 304.

[0032] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the stirring structure 15 further includes a second motor 1501 fixed to the upper surface of the tank cover 2. The driving end of the second motor 1501 passes through the tank cover 2 and is fixedly connected to a stirring shaft 1502. A set of stirring paddles 1503 are uniformly fixedly connected to the stirring shaft 1502. By driving the stirring shaft 1502 and the stirring paddles 1503 to rotate through the second motor 1501, the denitrification liquid and the flue gas can be fully mixed, thereby improving the denitrification efficiency.

[0033] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, a heating sleeve 16 is fixedly connected to the outer peripheral side wall of the denitrification tank 1, and a set of heating tubes 17 are evenly installed inside the heating sleeve 16; the heating tubes 17 facilitate the heating of the denitrification liquid in the denitrification tank 1, thereby improving the denitrification effect of the flue gas.

[0034] like Figure 3 and Figure 6As shown, in a preferred embodiment, based on the above method, a drain pipe 18 is fixedly connected to the bottom end of the denitrification tank 1, and a first control valve 19 is installed at the bottom end of the drain pipe 18. A sewage pipe 20 is fixedly connected to the side wall of the bottom cylinder 8, and a second control valve 21 is installed at the bottom end of the sewage pipe 20. The drain pipe 18 and the first control valve 19 facilitate the discharge of waste liquid generated during the treatment process, while the sewage pipe 20 and the second control valve 21 are used to discharge accumulated impurities and particulate matter.

[0035] like Figure 1 and Figure 6 As shown, in a preferred embodiment, based on the above method, four support legs 22 are evenly fixedly connected to the bottom of the descaling tank 1; providing stable support for the entire device and ensuring the smooth operation of the equipment.

[0036] Specifically, when using the denitrification device for this biomass boiler flue gas: First, the denitrification liquid is added to the denitrification tank 1, and the heating tube 17 heats the denitrification liquid. The flue gas enters the bottom cylinder 8 through the air inlet pipe 9. The filter bag 7 filters the dust in the flue gas. The filtered flue gas enters the denitrification tank 1 and comes into contact with the denitrification liquid to denitrify the flue gas. At the same time, the second motor 1501 is started. The second motor 1501 drives the stirring shaft 1502 and the stirring paddle 1503 to rotate, which can make the denitrification liquid and the flue gas fully mixed. After one denitrification, the flue gas flows upward. Then, the flue gas passes through the first denitrification layer 303 and the second denitrification layer 304 for a second denitrification. The denitrified gas is discharged through the air outlet 308. When the filter bag 7 needs to be cleaned, the first motor 10 drives the connecting shaft 11 and the mounting head 12 to install, thereby rotating the cleaning brush 13 to clean the filter bag 7, which facilitates subsequent flue gas filtration.

[0037] All technical features in this embodiment can be freely combined according to actual needs.

[0038] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A denitrification device for flue gas from a biomass boiler, comprising a denitrification tank (1), characterized in that, The top of the de-pinning tank (1) is detachably connected to a tank cover (2) via bolt assembly. Two de-pinning structures (3) are symmetrically arranged on the tank cover (2). A connecting sleeve (4) is provided on one side of the de-pinning tank (1). An air supply pipe (5) is fixedly connected to the upper end face of the connecting sleeve (4). The air supply pipe (5) penetrates the de-pinning tank (1) and extends into its interior. A filter cartridge (6) is detachably connected to the inner top wall of the connecting sleeve (4) via bolt assembly. A cloth bag (7) is fixedly connected to the outer peripheral side wall of the filter cartridge (6). The connecting sleeve (4) is connected to the filter cartridge (6) via bolt assembly. The component is detachably connected to a bottom cylinder (8), an air inlet pipe (9) is fixedly connected to the side wall of the bottom cylinder (8), a first motor (10) is fixedly connected to the lower end face of the bottom cylinder (8), the drive end of the first motor (10) passes through the bottom cylinder (8) and is fixedly connected to a connecting shaft (11), an installation head (12) is fixedly connected to the top end of the connecting shaft (11), a cleaning brush (13) is inserted into the installation head (12), a nut (14) is threaded onto the installation head (12), and a stirring structure (15) is provided on the tank cover (2).

2. The denitrification device for biomass boiler flue gas according to claim 1, characterized in that, The de-pin structure (3) includes two circular holes symmetrically opened on the can lid (2), and each circular hole is provided with an installation tube (301). The installation tube (301) is fixedly connected to the can lid (2). A connecting frame (302) is provided inside the installation tube (301). A first de-pin layer (303) and a second de-pin layer (304) are fixedly connected inside the connecting frame (302). The upper end face of the connecting frame (302) is symmetrical and fixedly connected with two locking blocks (305). Two locking grooves (306) matching the locking blocks (305) are symmetrically opened on the installation tube (301). A handle (307) is fixedly connected to the upper end face of the connecting frame (302). A set of air vents (308) are evenly opened at the bottom of the installation tube (301). A top plate (309) is connected to the top of the installation tube (301) by a bolt assembly. The lower end face of the top plate (309) is symmetrical and fixedly connected with two abutments (3010).

3. The denitrification device for biomass boiler flue gas according to claim 1, characterized in that, The stirring structure (15) includes a second motor (1501) fixed on the upper surface of the tank cover (2). The driving end of the second motor (1501) passes through the tank cover (2) and is fixedly connected to a stirring shaft (1502). A set of stirring paddles (1503) are evenly fixedly connected on the stirring shaft (1502).

4. The denitrification device for biomass boiler flue gas according to claim 1, characterized in that, A heating sleeve (16) is fixedly connected to the outer peripheral side wall of the denitrification tank (1), and a set of heating tubes (17) are evenly installed inside the heating sleeve (16).

5. The denitrification device for biomass boiler flue gas according to claim 1, characterized in that, The bottom end of the denitrification tank (1) is fixedly connected to a drain pipe (18), and a first control valve (19) is installed at the bottom end of the drain pipe (18). A sewage pipe (20) is fixedly connected to the side wall of the bottom cylinder (8), and a second control valve (21) is installed at the bottom end of the sewage pipe (20).

6. The denitrification device for biomass boiler flue gas according to claim 1, characterized in that, The bottom of the descaling tank (1) is uniformly and fixedly connected with four support legs (22).

Images