Coal-fired flue gas desulfurization and denitrification device for power plant

Abstract

The utility model discloses a coal-fired flue gas desulfurization and denitrification device for a power plant, which relates to the technical field of desulfurization and denitrification and comprises a detection box, a treatment box is arranged at the bottom of the detection box, and an auxiliary mechanism is mounted in the treatment box. The treated flue gas is discharged into a detection box through an auxiliary pipe, and whether activated carbon in the current activated carbon adsorption plate is saturated or not can be judged through adsorption saturation sensors symmetrically arranged on the two sides of the activated carbon adsorption plate, so that the adsorption cavity into which the flue gas enters is rapidly replaced, and the single activated carbon adsorption plate is conveniently detached and replaced; according to the flue gas treatment device, the use of other adsorption cavities is not influenced, the downtime is reduced, the flue gas treatment efficiency is further ensured, the flue gas is sprayed by the spraying pipe, and further cooling can be realized, so that condensation caused by too fast temperature drop of the flue gas is avoided, the flue gas humidity can be adjusted while cooling is performed, and the saturation speed of subsequent activated carbon is delayed.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization and denitrification technology, and in particular to a desulfurization and denitrification device for coal-fired flue gas in power plants. Background Technology

[0002] Flue gas desulfurization and denitrification are core technologies for industrial flue gas treatment, referring to the environmentally friendly treatment process of removing sulfur oxides (SOx) and nitrogen oxides (NOx) from flue gas.

[0003] For example, Chinese patent CN212369768U discloses a desulfurization and denitrification device for flue gas in a coal-fired power plant, including a desulfurization and denitrification zone. The left end of the desulfurization and denitrification zone is fixedly connected to a filter box via a connecting pipe. The right end of the desulfurization and denitrification zone is equipped with a power supply device. The left end of the filter box is fixedly connected to an air inlet pipe. A filter screen is provided in the middle of the inner cavity of the filter box. A high-temperature heating layer is provided on the side wall of the desulfurization and denitrification zone. A temperature detection rod is provided at the top of the desulfurization and denitrification zone. An insulation layer is fixedly connected to the outer wall of the high-temperature heating layer. A temperature display panel is provided at the front end of the desulfurization and denitrification zone. An activated carbon purification zone is fixedly connected to the top of the desulfurization and denitrification zone. An activated carbon filter plate is provided in the inner cavity of the activated carbon purification zone. The right end of the activated carbon purification zone is fixedly connected to a detection box via a connecting pipe.

[0004] In the aforementioned patent, although the problem of insufficient dust pretreatment affecting desulfurization and denitrification efficiency was solved by using HEPA filters, the activated carbon filter plate is a multi-group adsorption design, and the entire unit needs to be disassembled and replaced after adsorption saturation, which increases downtime. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the existing technology where activated carbon filter plates are designed with multiple adsorption groups, and the entire unit needs to be disassembled and replaced after adsorption saturation, which increases downtime. Therefore, this invention proposes a desulfurization and denitrification device for coal-fired flue gas in power plants.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a desulfurization and denitrification device for coal-fired flue gas in power plants, comprising a detection box, a processing box at the bottom of the detection box, and an auxiliary mechanism installed inside the processing box. The auxiliary mechanism includes an adsorption saturation sensor, a reinforcing plate, and an activated carbon adsorption plate. One side of the reinforcing plate is fixedly connected to the inner wall of the processing box, and a partition is fixedly connected to the top of the reinforcing plate, dividing the area above the reinforcing plate into three adsorption chambers. The activated carbon adsorption plate is installed in the three adsorption chambers, and the bottom of the activated carbon adsorption plate is slidably connected to the reinforcing plate. One side of the activated carbon adsorption plate is inserted into the side wall of the processing box. The adsorption saturation sensor is located on both sides of the activated carbon adsorption plate, and the bottom of the adsorption saturation sensor is connected to the reinforcing plate by bolts. A branch pipe is embedded inside the reinforcing plate, and a guide pipe is fixedly connected to the bottom of the branch pipe. The end of the guide pipe is fixedly connected to a purification box via an axial flow fan.

[0007] Preferably, a discharge pipe is embedded inside the partition, and a one-way valve is installed at the end of the discharge pipe.

[0008] Preferably, a sealing plate is fitted onto the top of the processing box, and an auxiliary tube is embedded inside the sealing plate, with the top of the auxiliary tube communicating with the detection box.

[0009] Preferably, a spray pipe is fixedly connected to the top of the inner cavity of the purification box, one end of the spray pipe is fixedly connected to an extension pipe, and the end of the extension pipe penetrates the side wall of the purification box.

[0010] Preferably, the bottom of the inner cavity of the purification box is slidably connected to an internal box, and one side of the purification box is fixedly connected to a guide pipe via an axial flow fan.

[0011] Preferably, a heat exchanger is fixedly connected to the bottom of the first guide pipe, and a second guide pipe is fixedly connected to the bottom of the heat exchanger. The end of the second guide pipe is connected to the catalytic converter via an axial flow fan.

[0012] Preferably, the top of the heat exchanger is fixedly connected to a second connecting pipe, the bottom of the second connecting pipe is fixedly connected to a water tank, a water pump is fixedly connected to one side of the water tank, one end of the water pump is fixedly connected to a first connecting pipe, and the top of the first connecting pipe is fixedly connected to the heat exchanger.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, the activated carbon adsorption plate and the reinforcing plate are slidably connected, and the branch pipe and the guide pipe are connected in a three-way connection. The flue gas enters the adsorption chamber through the guide pipe and the branch pipe and is adsorbed by the activated carbon adsorption plate. The treated flue gas is discharged into the detection box through the auxiliary pipe. The adsorption saturation sensors symmetrically arranged on both sides of the activated carbon adsorption plate can determine whether the activated carbon in the current activated carbon adsorption plate is saturated, so as to quickly replace the adsorption chamber into which the flue gas enters. It is convenient to disassemble and replace a single activated carbon adsorption plate without affecting the use of other adsorption chambers, reducing downtime, and thus ensuring the treatment efficiency of flue gas.

[0015] 2. In this utility model, the second guide pipe is connected to the heat exchanger, and the spray pipe is installed inside the water tank. The flue gas enters the heat exchanger through the second guide pipe and enters the water tank through the first guide pipe. The heat exchanger exchanges heat with the flue gas to achieve initial cooling. By spraying the flue gas with the spray pipe, further cooling can be achieved, thereby avoiding condensation caused by the flue gas temperature dropping too quickly. The humidity of the flue gas can be adjusted while cooling, thus slowing down the saturation rate of the activated carbon. Attached Figure Description

[0016] Figure 1 This utility model provides a three-dimensional structural schematic diagram of a coal-fired flue gas desulfurization and denitrification device for power plants;

[0017] Figure 2This utility model provides a schematic diagram of the connection pipe structure for a desulfurization and denitrification device for coal-fired gas in power plants.

[0018] Figure 3 This utility model provides a schematic diagram of the installation of the extension pipe structure of a coal-fired flue gas desulfurization and denitrification device for power plants;

[0019] Figure 4 This utility model provides a schematic diagram of the branch pipe structure installation for a coal-fired flue gas desulfurization and denitrification device used in power plants.

[0020] Legend: 1. Catalytic converter; 2. Heat exchanger; 3. Guide pipe one; 4. Guide pipe two; 5. Water pump; 6. Water tank; 7. Purification box; 8. Treatment box; 9. Internal box; 10. Connecting pipe one; 11. Connecting pipe two; 12. Spray pipe; 13. Detection box; 14. Adsorption saturation sensor; 15. Reinforcing plate; 16. Sealing plate; 17. Guide pipe three; 18. Discharge pipe; 19. Auxiliary pipe; 20. Baffle plate; 21. Branch pipe; 22. Activated carbon adsorption plate; 23. Extension pipe. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1: Refer to Figures 1-4As shown: A desulfurization and denitrification device for coal-fired gas in power plants includes a detection box 13, a processing box 8 at the bottom of the detection box 13, and an auxiliary mechanism installed inside the processing box 8. The auxiliary mechanism includes an adsorption saturation sensor 14, a reinforcing plate 15, and an activated carbon adsorption plate 22. One side of the reinforcing plate 15 is fixedly connected to the inner wall of the processing box 8, and a partition 20 is fixedly connected to the top of the reinforcing plate 15. The partition 20 divides the area above the reinforcing plate 15 into three adsorption chambers. The activated carbon adsorption plate 22 is installed in the three adsorption chambers, and the bottom of the activated carbon adsorption plate 22 is slidably connected to the reinforcing plate 15. One side is inserted into the side wall of the treatment box 8. The adsorption saturation sensor 14 is located on both sides of the activated carbon adsorption plate 22, and the bottom of the adsorption saturation sensor 14 is connected to the reinforcing plate 15 by bolts. A branch pipe 21 is embedded inside the reinforcing plate 15. The bottom of the branch pipe 21 is fixedly connected to the guide pipe 3 17. The end of the guide pipe 3 17 is fixedly connected to the purification box 7 by an axial flow fan. An exhaust pipe 18 is embedded inside the partition plate 20. A one-way valve is installed at the end of the exhaust pipe 18. A sealing plate 16 is snapped on the top of the treatment box 8. An auxiliary pipe 19 is embedded inside the sealing plate 16. The top of the auxiliary pipe 19 is connected to the detection box 13.

[0024] The sealing plate 16 is snapped onto the top of the treatment box 8, and the auxiliary pipe 19 embedded within it enables flue gas communication between the treatment box 8 and the detection box 13, ensuring sealing performance. The activated carbon adsorption plate 22 is slidably connected to the top of the reinforcing plate 15 and inserted into the side wall of the treatment box 8, allowing for flexible placement and removal. It can be quickly removed and replaced without disassembling the device, reducing maintenance difficulty and downtime. Multiple plates are used alternately to ensure stable adsorption efficiency. The adsorption saturation sensor 14 is fixed to the reinforcing plate 15 by bolts and is symmetrically distributed on both sides of the activated carbon adsorption plate 22 to monitor adsorption in real time. The difference in pollutant concentration on both sides of the plate determines whether the corresponding activated carbon adsorption plate 22 is saturated. The guide pipe 17 is fixedly connected to the branch pipe 21 embedded in the reinforcing plate 15 to realize the transportation of the flue gas to be treated to the adsorption chamber. The discharge pipe 18 is embedded in the partition plate 20 and works with the auxiliary pipe 19 and the one-way valve on the branch pipe 21 to control the flue gas switching path. The one-way valve, branch pipe 21, discharge pipe 18 and auxiliary pipe 19 form a precise flue gas path control system to prevent flue gas backflow or cross-cavity, and ensure the sealing and flue gas treatment continuity when the adsorption chamber is switched.

[0025] Example 2: Figures 1-3As shown, a spray pipe 12 is fixedly connected to the top of the inner cavity of the purification box 7. One end of the spray pipe 12 is fixedly connected to an extension pipe 23. The end of the extension pipe 23 penetrates the side wall of the purification box 7. An internal box 9 is slidably connected to the bottom of the inner cavity of the purification box 7. A guide pipe 1 3 is fixedly connected to one side of the purification box 7 through an axial flow fan. A heat exchanger 2 is fixedly connected to the bottom of the guide pipe 1 3. A guide pipe 2 4 is fixedly connected to the bottom of the heat exchanger 2. The end of the guide pipe 2 4 is connected to the catalytic box 1 through an axial flow fan. A connecting pipe 2 11 is fixedly connected to the top of the heat exchanger 2. A water tank 6 is fixedly connected to the bottom of the connecting pipe 2 11. A water pump 5 is fixedly connected to one side of the water tank 6. One end of the water pump 5 is fixedly connected to a connecting pipe 1 10. The top of the connecting pipe 1 10 is fixedly connected to the heat exchanger 2.

[0026] After dust removal, the flue gas enters through a pipe on one side of the catalytic converter 1. Under the action of the catalyst, pollutants such as nitrogen oxides in the flue gas are initially decomposed, completing the denitrification pretreatment. A water pump 5 on one side of the water tank 6 is connected to the bottom of the heat exchanger 2 via a connecting pipe 10, forming a water circulation system. The water pump 5 drives the water in the water tank 6 to circulate in the heat exchanger 2, absorbing heat from the flue gas and achieving flue gas cooling. A spray pipe 12 is fixed to the top of the inner cavity of the purification chamber 7, atomizing the water and spraying it onto the flue gas. The atomized spray increases the contact area between the water mist and the flue gas, enhancing the cooling effect on one hand, and dissolving some acidic pollutants on the other, achieving initial denitrification. Desulfurization reduces the desulfurization pressure on activated carbon adsorption plate 22. The built-in box 9 is used to collect waste liquid and pollutant sediments that have not been completely evaporated after spraying, which is convenient for centralized treatment. The purification box 7 is connected to the guide pipe 17 through an axial flow fan, which sends the flue gas after catalysis, heat exchange and spraying pretreatment into the adsorption chamber of the treatment box 8 to complete the subsequent deep purification. The guide pipe 3, guide pipe 4 and axial flow fan ensure smooth transportation of flue gas between the catalytic box 1, heat exchanger 2, purification box 7 and treatment box 8. The axial flow fan provides power to ensure the continuous and stable flue gas treatment process and avoid local gas accumulation that affects the treatment efficiency.

[0027] The usage and working principle of this device: All electrical components mentioned in this application are externally connected to a power supply and control switch during use. First, one end of guide pipe 3, guide pipe 4, and guide pipe 17 are connected to an axial flow fan. The flue gas from the power plant, after dust removal, is sent into the catalytic chamber 1 through a pipe on one side. The catalytic chamber 1 contains a catalyst. After being treated by the catalyst, the flue gas enters the heat exchanger 2 through guide pipe 4 for cooling. Then, it is sent into the purification chamber 7 through guide pipe 3. An external water source is connected to the extension pipe 23. Low-pressure atomized spraying of deionized water is applied to the flue gas using spray pipe 12. The water mist evaporates rapidly upon contact with the flue gas, absorbing heat and further cooling it. Then, the flue gas enters guide pipe 17, where it is adsorbed and treated in the first adsorption chamber. If the activated carbon adsorption plates 22... If the pollutant concentration difference detected by the adsorption saturation sensor 14 on the side is lower than the set value, it is determined that the activated carbon adsorption plate 22 in the current adsorption chamber is saturated. At this time, the branch pipe 21 and auxiliary pipe 19 corresponding to the first adsorption chamber are closed, the one-way valve on the guide pipe 17 is closed, and the one-way valve on the discharge pipe 18 is opened to allow the flue gas to enter the second adsorption chamber for adsorption. The branch pipe 21 at the bottom of the second adsorption chamber is opened, and the valve on the guide pipe 17 is opened to allow the subsequent flue gas to enter the second adsorption chamber for processing. The purified flue gas is sent to the detection box 13 for testing through the auxiliary pipe 19. If it meets the standard, it is discharged through the exhaust pipe at the top of the detection box 13. At this time, the activated carbon adsorption plate 22 in the first adsorption chamber can be taken out for processing. One-way valves are installed on both the auxiliary pipe 19 and the branch pipe 21.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A coal-fired flue gas desulfurization and denitrification device for power plants, comprising a detection box (13), characterized in that: The bottom of the detection box (13) is provided with a treatment box (8), an auxiliary mechanism is installed in the treatment box (8), the auxiliary mechanism comprises an adsorption saturation sensor (14), a reinforcing plate (15) and an activated carbon adsorption plate (22), one side of the reinforcing plate (15) is fixedly connected with the inner wall of the treatment box (8), the top of the reinforcing plate (15) is fixedly connected with a partition plate (20), the partition plate (20) divides the upper portion of the reinforcing plate (15) into three adsorption cavities, the activated carbon adsorption plate (22) is installed in the three adsorption cavities, the bottom of the activated carbon adsorption plate (22) is slidably connected with the reinforcing plate (15), one side of the activated carbon adsorption plate (22) is inserted with the side wall of the treatment box (8), the adsorption saturation sensor (14) is located on the two sides of the activated carbon adsorption plate (22), the bottom of the adsorption saturation sensor (14) is connected with the reinforcing plate (15) through bolts, the reinforcing plate (15) is embedded with a branch pipe (21), the bottom of the branch pipe (21) is fixedly and continuously communicated with a guide pipe three (17), the tail end of the guide pipe three (17) is fixedly and continuously communicated with a purification box (7) through an axial flow fan.

2. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 1, characterized in that: The partition plate (20) is embedded with a discharge pipe (18), and the tail end of the discharge pipe (18) is installed with a check valve.

3. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 1, characterized in that: The top of the treatment box (8) is clamped with a sealing plate (16), the sealing plate (16) is embedded with an auxiliary pipe (19), and the top of the auxiliary pipe (19) is communicated with the detection box (13).

4. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 1, characterized in that: The top of the purification box (7) is fixedly connected with a spraying pipe (12), one end of the spraying pipe (12) is fixedly and continuously communicated with an extension pipe (23), and the tail end of the extension pipe (23) penetrates through the side wall of the purification box (7).

5. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 4, characterized in that: The bottom of the purification box (7) is slidably connected with an embedded box (9), and one side of the purification box (7) is fixedly and continuously communicated with a guide pipe one (3) through an axial flow fan.

6. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 5, characterized in that: The bottom of the guide pipe one (3) is fixedly and continuously communicated with a heat exchanger (2), the bottom of the heat exchanger (2) is fixedly and continuously communicated with a guide pipe two (4), and the tail end of the guide pipe two (4) is communicated with a catalytic box (1) through an axial flow fan.

7. The coal-fired flue gas desulfurization and denitrification device for power plants according to claim 6, characterized in that: The top of the heat exchanger (2) is fixedly and continuously communicated with a connecting pipe two (11), the bottom of the connecting pipe two (11) is fixedly and continuously communicated with a water tank (6), one side of the water tank (6) is fixedly and continuously communicated with a water pump (5), one end of the water pump (5) is fixedly and continuously communicated with a connecting pipe one (10), and the top of the connecting pipe one (10) is fixedly and continuously communicated with the heat exchanger (2).

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