Coal-fired flue gas denitration reactor with low energy consumption

Abstract

The utility model discloses a low-energy-consumption coal-fired flue gas denitration reactor and relates to the technical field of waste gas treatment. The flue gas treatment device comprises a treatment pipe, a flue gas pipe is fixedly connected to the surface of the treatment pipe in an inserted mode, a filter screen is fixedly connected to the inner wall of the flue gas pipe, a reverse blowing assembly used for cleaning the filter screen is arranged below the filter screen, and an impurity removal assembly used for absorbing impurities is arranged at the top of the treatment pipe. A purification box is fixedly connected to the bottom of the treatment pipe, two ceramic filter elements are installed in the purification box, a sealing door is hinged to the front face of the purification box, an SCR denitration device is fixedly installed at the bottom of the purification box, and an exhaust pipe is fixedly connected to the surface of the SCR denitration device in an inserted mode; the coal-fired flue gas filtering device has the advantages that the coal-fired flue gas can be automatically filtered during use, the filter screen can be automatically and effectively cleaned, blockage of the filter screen due to long-time operation is avoided, and the coal-fired flue gas filtering device is more convenient to operate and maintain.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a low-energy-consumption coal-fired flue gas denitrification reactor. Background Technology

[0002] With the acceleration of industrialization, the pollution caused by flue gas emitted from coal-fired power plants and industrial boilers during production has become increasingly serious. Nitrogen oxides (NOx) in flue gas are one of the major air pollutants, posing a serious threat to the environment and human health. To reduce NOx emissions, flue gas denitrification technology has been widely applied in coal-fired equipment. Among them, selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are currently the mainstream denitrification technologies.

[0003] In existing flue gas denitrification reactors, filter boxes and screens are typically installed before the flue gas enters the reactor to remove solid impurities such as dust and particulate matter. If these solid impurities enter the denitrification reactor, they may clog the catalyst or the internal structure of the reactor, reducing denitrification efficiency and even damaging the equipment. Therefore, filtration devices play a crucial role in flue gas denitrification systems.

[0004] However, existing filtration devices have a significant drawback: while they incorporate filters to intercept solid impurities, they lack an effective automatic cleaning mechanism. Over time, a large amount of solid particles accumulate on the filter surface, causing blockage. This not only reduces the amount of flue gas passing through but also increases system resistance, leading to higher energy consumption and ultimately reducing the overall efficiency of the denitrification system.

[0005] Therefore, a low-energy-consumption coal-fired flue gas denitrification reactor is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a low-energy-consumption coal-fired flue gas denitrification reactor to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A low-energy-consumption coal-fired flue gas denitrification reactor includes a treatment pipe, a flue gas pipe fixedly inserted into the surface of the treatment pipe, a filter screen fixedly connected to the inner wall of the flue gas pipe, a backflushing assembly for cleaning the filter screen located below the filter screen, a purification assembly for absorbing and treating impurities located at the top of the treatment pipe, a purification box fixedly connected to the bottom of the treatment pipe, two ceramic filter elements installed inside the purification box, a sealing door hinged to the front of the purification box, an SCR denitrification device fixedly installed at the bottom of the purification box, an exhaust pipe fixedly inserted into the surface of the SCR denitrification device, and a switching assembly for guiding the flue gas located on the surface of the purification box.

[0009] Furthermore, the backflush assembly includes a motor, which is fixedly mounted on the side of the treatment pipe. The output end of the motor is fixedly connected to a rotating shaft, and the end of the rotating shaft is fixedly connected to a mounting box. The mounting box is a rectangular box-shaped structure with an open top. An air inlet pipe is fixedly inserted into the right side of the treatment pipe and is connected to the output end of an external air compressor. A nozzle is fixedly mounted on the surface of the air inlet pipe.

[0010] Furthermore, the cleaning component includes a vacuum cleaner, which is fixedly installed on the top surface of the processing tube. The suction end of the vacuum cleaner is located inside the processing tube. An electric push rod is fixedly installed on the top surface of the processing tube. A connecting rod is fixedly connected to the telescopic end of the electric push rod. A sealing cover is fixedly connected to the end of the connecting rod, and the suction end of the vacuum cleaner is located inside the sealing cover.

[0011] Furthermore, the switching assembly includes a partition plate, which is fixedly connected to the inner wall of the treatment pipe. A first Y-shaped air guide pipe is fixedly inserted into the bottom of the partition plate, and a solenoid valve is provided on each of the two branches of the first Y-shaped air guide pipe. The bottom end of the first Y-shaped air guide pipe is fixedly connected to the purification box, and a second Y-shaped air guide pipe is fixedly inserted into the bottom of the purification box. The bottom end of the second Y-shaped air guide pipe is fixedly connected to the SCR denitrification unit.

[0012] Furthermore, check valves are installed on both branches of the second Y-shaped air guide tube.

[0013] Furthermore, a sealing gasket is fixedly connected to the top of the sealing cover, and the sealing gasket is made of rubber.

[0014] The beneficial effects of this utility model are as follows:

[0015] Flue gas from coal combustion is introduced into the treatment pipe through the flue gas pipe. It undergoes initial filtration through a filter screen, then enters the purification chamber for further filtration. Finally, the flue gas enters the SCR denitrification unit for denitrification treatment. After treatment, it is discharged through the exhaust pipe. After a period of operation, the back-flushing component blows air upwards through the filter screen, cleaning particulate impurities clogging its surface. The impurity removal component then extracts impurities from inside the treatment pipe, cleaning the filter screen. When the ceramic filter element needs replacement, the switching component controls the exhaust gas to flow from the other side of the purification chamber, opening the sealed door to disassemble and replace one of the ceramic filter elements without affecting flue gas treatment. This system facilitates automated filtration of coal combustion flue gas, automatically and effectively cleaning the filter screen and preventing clogging from prolonged operation, making operation and maintenance more convenient. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0018] Figure 3 This is a front sectional view of the backflush assembly structure of this utility model;

[0019] Figure 4 This is a partial structural schematic diagram of the present invention;

[0020] Reference numerals: 1. Processing pipe; 2. Flue gas pipe; 3. Filter screen; 4. Backflush assembly; 401. Motor; 402. Shaft; 403. Mounting box; 404. Inlet pipe; 405. Nozzle; 5. Impurity removal assembly; 501. Vacuum cleaner; 502. Electric push rod; 503. Connecting rod; 504. Sealing cover; 505. Sealing gasket; 6. Purification box; 7. Ceramic filter element; 8. Switching assembly; 801. Partition plate; 802. First Y-shaped air guide pipe; 803. Solenoid valve; 804. Second Y-shaped air guide pipe; 9. SCR denitrification unit; 10. Exhaust pipe; 11. Sealing door. Detailed Implementation

[0021] 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 embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figures 1 to 4As shown, a low-energy-consumption coal-fired flue gas denitrification reactor includes a treatment pipe 1, a flue gas pipe 2 fixedly inserted into the surface of the treatment pipe 1, a filter screen 3 fixedly connected to the inner wall of the flue gas pipe 2, a backflushing assembly 4 for cleaning the filter screen 3 below the filter screen 3, a purification assembly 5 for absorbing and treating impurities at the top of the treatment pipe 1, a purification box 6 fixedly connected to the bottom of the treatment pipe 1, two ceramic filter elements 7 installed inside the purification box 6, a sealing door 11 hinged to the front of the purification box 6, an SCR denitrifier 9 fixedly installed at the bottom of the purification box 6, an exhaust pipe 10 fixedly inserted into the surface of the SCR denitrifier 9, and a switching assembly 8 for guiding the flue gas on the surface of the purification box 6. More specifically, the coal-fired flue gas is introduced into the treatment pipe 1 through the flue gas pipe 2, and is initially filtered by the filter screen 3. Then, the flue gas enters the purification box 6 for further filtration, and finally enters the SCR denitrification unit 9 for denitrification treatment. After treatment, it is discharged through the exhaust pipe 10. After running for a period of time, the back-flushing component 4 is activated to blow air from bottom to top onto the filter screen 3, cleaning the particulate impurities clogging the surface of the filter screen 3. Then, the impurity removal component 5 is activated to extract the impurities inside the treatment pipe 1, thereby cleaning the filter screen 3. When it is necessary to replace the ceramic filter element 7, the waste gas can be controlled to flow from the other side of the purification box 6 by the switching component 8, and the sealing door 11 can be opened to disassemble and replace one of the ceramic filter elements 7 without affecting the treatment of the flue gas.

[0027] The backflushing assembly 4 includes a motor 401, which is fixedly mounted on the side of the treatment pipe 1. A rotating shaft 402 is fixedly connected to the output end of the motor 401, and a mounting box 403 is fixedly connected to the end of the rotating shaft 402. The mounting box 403 is a rectangular box-shaped structure with an open top. An air inlet pipe 404 is fixedly inserted into the right side of the treatment pipe 1 and is connected to the output end of an external air compressor. A nozzle 405 is fixedly mounted on the surface of the air inlet pipe 404. It should be noted that under normal conditions, the open portion of the mounting box 403 faces downwards, protecting the nozzle 405 and preventing flue gas from directly blowing onto its surface. When cleaning the filter screen 3 is required, the motor 401 drives the rotating shaft 402 to rotate, thereby controlling the rotation of the mounting box 403 so that its open surface faces upwards. High-speed gas is then introduced through the air inlet pipe 404 and ejected through the nozzle 405, thus performing a blow-blowing treatment on the filter screen 3.

[0028] The impurity removal component 5 includes a vacuum cleaner 501, which is fixedly installed on the top surface of the processing pipe 1. The suction end of the vacuum cleaner 501 is located inside the processing pipe 1. An electric push rod 502 is fixedly installed on the top surface of the processing pipe 1. A connecting rod 503 is fixedly connected to the telescopic end of the electric push rod 502. A sealing cover 504 is fixedly connected to the end of the connecting rod 503, and the suction end of the vacuum cleaner 501 is located inside the sealing cover 504. More specifically, under normal conditions, the sealing cover 504 is in contact with the top of the inner wall of the processing pipe 1 to prevent smoke from leaking from the vacuum cleaner 501. When it is necessary to absorb impurities, the electric push rod 502 is operated to drive the connecting rod 503 and the sealing cover 504 to descend, and then the vacuum cleaner 501 is operated to absorb the particulate impurities present inside the processing pipe 1.

[0029] The switching assembly 8 includes a partition 801, which is fixedly connected to the inner wall of the treatment pipe 1. A first Y-shaped air guide pipe 802 is fixedly inserted into the bottom of the partition 801, and a solenoid valve 803 is installed on each of the two branches of the first Y-shaped air guide pipe 802. The bottom end of the first Y-shaped air guide pipe 802 is fixedly connected to the purification box 6, and a second Y-shaped air guide pipe 804 is fixedly inserted into the bottom of the purification box 6. The bottom end of the second Y-shaped air guide pipe 804 is fixedly connected to the SCR denitrification unit 9. It should be noted that when it is necessary to replace one of the ceramic filter elements 7, by closing the solenoid valve 803 on that side, the flue gas can flow through the other branch of the first Y-shaped air guide pipe 802. At this time, the sealing door 11 can be opened to replace the ceramic filter element 7 without affecting the flue gas treatment.

[0030] Both branches of the second Y-shaped air guide pipe 804 are equipped with check valves. More specifically, by installing check valves, flue gas can be prevented from flowing back to the other side, thereby preventing flue gas leakage when replacing the ceramic filter element 7.

[0031] A sealing gasket 505, made of rubber, is fixedly connected to the top of the sealing cover 504. It should be noted that by setting the sealing gasket 505, the sealing cover 504 makes a tighter contact with the top of the inner wall of the treatment pipe 1, preventing flue gas from leaking through gaps.

[0032] In summary: The flue gas from coal combustion is introduced into the treatment pipe 1 through the flue gas pipe 2. It undergoes initial filtration through the filter screen 3, then enters the purification chamber 6 for further filtration. Finally, the flue gas enters the SCR denitrification unit 9 for denitrification treatment. After treatment, it is discharged through the exhaust pipe 10. After a period of operation, the back-flushing component 4 blows air upwards onto the filter screen 3, cleaning particulate impurities clogging its surface. The impurity removal component 5 then extracts impurities from the treatment pipe 1, cleaning the filter screen 3. When the ceramic filter element 7 needs replacement, the switching component 8 controls the exhaust gas to flow from the other side of the purification chamber 6, and the sealing door 11 is opened, allowing for the removal and replacement of one of the ceramic filter elements 7 without affecting flue gas treatment. This system facilitates automated filtration of coal combustion flue gas, effectively cleaning the filter screen and preventing clogging during prolonged operation, thus making operation and maintenance more convenient.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-energy-consumption coal-fired flue gas denitrification reactor, characterized in that, The system includes a treatment pipe (1), a flue gas pipe (2) fixedly inserted into the surface of the treatment pipe (1), a filter screen (3) fixedly connected to the inner wall of the flue gas pipe (2), a backflushing assembly (4) for cleaning the filter screen (3) is provided below the filter screen (3), a purification assembly (5) for absorbing and treating impurities is provided at the top of the treatment pipe (1), a purification box (6) fixedly connected to the bottom of the treatment pipe (1), two ceramic filter elements (7) installed inside the purification box (6), a sealing door (11) hinged to the front of the purification box (6), an SCR denitrifier (9) fixedly installed at the bottom of the purification box (6), an exhaust pipe (10) fixedly inserted into the surface of the SCR denitrifier (9), and a switching assembly (8) for guiding the flue gas is provided on the surface of the purification box (6).

2. The low-energy-consumption coal-fired flue gas denitrification reactor according to claim 1, characterized in that, The backflush assembly (4) includes a motor (401), and the motor (401) is fixedly installed on the side of the treatment pipe (1). The output end of the motor (401) is fixedly connected to a rotating shaft (402), and the end of the rotating shaft (402) is fixedly connected to a mounting box (403). The mounting box (403) is a rectangular box-shaped structure with an open top. An air inlet pipe (404) is fixedly inserted into the right side of the treatment pipe (1), and the air inlet pipe (404) is connected to the output end of an external air compressor. A nozzle (405) is fixedly installed on the surface of the air inlet pipe (404).

3. The low-energy-consumption coal-fired flue gas denitrification reactor according to claim 2, characterized in that, The cleaning component (5) includes a vacuum cleaner (501), which is fixedly installed on the top surface of the processing tube (1). The suction end of the vacuum cleaner (501) is located inside the processing tube (1). An electric push rod (502) is fixedly installed on the top surface of the processing tube (1). A connecting rod (503) is fixedly connected to the telescopic end of the electric push rod (502). A sealing cover (504) is fixedly connected to the end of the connecting rod (503), and the suction end of the vacuum cleaner (501) is located inside the sealing cover (504).

4. The low-energy-consumption coal-fired flue gas denitrification reactor according to claim 1, characterized in that, The switching assembly (8) includes a partition (801), and the partition (801) is fixedly connected to the inner wall of the processing pipe (1). A first Y-shaped air guide pipe (802) is fixedly inserted into the bottom of the partition (801), and a solenoid valve (803) is provided on both branches of the first Y-shaped air guide pipe (802). The bottom end of the first Y-shaped air guide pipe (802) is fixedly connected to the purification box (6). A second Y-shaped air guide pipe (804) is fixedly inserted into the bottom of the purification box (6), and the bottom end of the second Y-shaped air guide pipe (804) is fixedly connected to the SCR denitrifier (9).

5. The low-energy-consumption coal-fired flue gas denitrification reactor according to claim 4, characterized in that, Check valves are provided on both branches of the second Y-shaped air guide tube (804).

6. The low-energy-consumption coal-fired flue gas denitrification reactor according to claim 3, characterized in that, A sealing gasket (505) is fixedly connected to the top of the sealing cover (504), and the sealing gasket (505) is made of rubber.

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