Flue gas denitration device of coal-fired boiler

Abstract

The utility model discloses a coal-fired boiler flue gas denitration device which comprises a shell, a filter box is fixedly connected to the left side of the shell, an air inlet is formed in the left side of the filter box, an air outlet is formed in the inner top of the shell, a plurality of catalytic plates are installed in the shell at equal intervals, and a filter screen is vertically installed in the filter box; the denitration mechanism comprises diversion cylinders which are symmetrically and fixedly connected to the left side wall and the right side wall of the shell, a plurality of spray heads are installed on the opposite sides of the two diversion cylinders, the input ends of the spray heads extend into the corresponding diversion cylinders, the diversion cylinder located on the left side communicates with a filter box through a connecting opening, and the filter box communicates with the right side through a connecting opening; and a first pump body is mounted on the right side of the shell. The device has the advantages that the device has a good denitration effect, and the filter screen part is cleaned by combining sweeping cleaning and water body back-flushing cleaning, so that the condition of secondary adhesion of dust can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration, in particular to a flue gas denitration device for a coal-fired boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. During the combustion and heating process of the boiler, a large amount of flue gas will be generated. This flue gas cannot be discharged directly. It is necessary to filter and denitrate the harmful substances in the flue gas, and then contact it with ammonia water and finally discharge it after passing through the catalytic plate. The filtering part is often blocked, which affects the overall denitrification efficiency.

[0003] To this end, the utility model patent with publication number CN220257679U discloses a boiler flue gas denitrification device, which belongs to the technical field of boiler flue gas denitrification, including a machine body, an ammonia tank, an air pump, an air pipe, an injection frame and a filter box, the filter box is fixedly connected to one side outer wall of the machine body, the filter box is provided with an air inlet on the side away from the machine body, a filter screen plate is provided in the inner groove of the filter box, a cleaning brush is provided on the side of the filter screen plate relative to the air inlet, and the machine body is fixedly connected with a collecting box on the side wall below the filter box, the filter box is connected with a collecting pipe at the bottom position below the cleaning brush, and the bottom end of the collecting pipe is plugged into the collecting box; the flue gas filter screen structure of the utility model is arranged to be installed vertically, and a cleaning brush structure that moves up and down is arranged on the filtering side thereof, so as to clean the particle dust attached to the surface of the filter, reduce the problem of clogging of the filter screen, ensure the smooth flow of the flue gas, and improve the stability and efficiency of the filtering and flue gas denitrification treatment;

[0004] However, in actual practical use, we found that the above-mentioned device uses a mobile cleaning brush structure to clean the particulate dust attached to the filter surface. During the continuous flow of flue gas, the dust is likely to adhere to the filter for a second time. In addition, some small dust may even pass through the filter due to cleaning and squeeze, and enter the subsequent processes, affecting subsequent use. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a coal-fired boiler flue gas denitration device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A coal-fired boiler flue gas denitrification device comprises a shell, a filter box is fixedly connected to the left side of the shell, an air inlet is opened on the left side of the filter box, an exhaust port is arranged on the inner top of the shell, a plurality of catalytic plates are installed at equal intervals inside the shell, and a filter screen is vertically installed in the filter box; a denitrification mechanism, the denitrification mechanism comprises a diverter cylinder symmetrically fixedly connected to the left and right side walls of the shell, a plurality of nozzles are installed on opposite sides of the two diverter cylinders, and input ends of the plurality of nozzles extend into corresponding diverter cylinders, the diverter cylinder on the left side is connected to the filter box through a connecting port, a first pump body is installed on the right side of the shell, and a liquid outlet pipe of the first pump body is connected to the diverter cylinder on the right side; a cleaning mechanism, the cleaning mechanism is used to clean the filter screen.

[0008] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: the cleaning mechanism includes a first threaded rod rotatably connected between the upper and lower inner walls of the filter box, a first slide bar is threadedly connected to the first threaded rod, a brush layer is provided on the right side of the first slide bar, and the front and rear sides of the first slide bar are both slidably connected to the front and rear inner walls of the filter box.

[0009] In order to better achieve the above purpose, the utility model adopts a further technical solution: a second threaded rod is rotatably connected between the upper and lower inner walls of the filter box, a second slide bar is threadedly connected to the second threaded rod, and the front and rear sides of the second slide bar are slidably connected to the front and rear inner walls of the filter box.

[0010] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: a second pump body is fixedly connected to the right side of the shell, the liquid outlet end of the second pump body is connected to a hose, a cavity is provided in the second slide bar, a flat opening is opened on the left inner wall of the cavity, and the other end of the hose is connected to the cavity.

[0011] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: the upper ends of the first threaded rod and the second threaded rod both extend to the outside and are connected through a transmission member, the transmission member includes two pulleys, the two pulleys are respectively installed on the first threaded rod and the second threaded rod, the two pulleys are connected through a transmission belt, and a motor is installed on the upper end of the filter box, and the output shaft of the motor is fixedly connected to the upper end of the first threaded rod.

[0012] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: a collecting box is fixedly connected to the lower end of the filter box, the collecting box is connected to the inner bottom of the filter box through multiple first drainage ports, and a second drainage port is provided at the inner bottom of the collecting box, and solenoid valves are installed in the second drainage port and multiple first drainage ports.

[0013] The advantages of the utility model are: by using a diverter tube and multiple nozzles, the flue gas and ammonia water can be fully contacted after being diverted, so as to achieve a better denitrification effect; the combination of brush cleaning and water backwashing can achieve a better cleaning effect, and the dust can be dissolved in the water and then fall into the collection box without adhering to the filter screen for a second time; and the use of backwashing can prevent the dust from passing through the filter screen and entering the right side of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the coal-fired boiler flue gas denitrification device proposed in the utility model;

[0015] Figure 2 for Figure 1 A cross-sectional view of

[0016] Figure 3 for Figure 2 Enlarged view of point A.

[0017] In the figure: 1 shell, 2 filter box, 3 collection box, 4 motor, 5 exhaust port, 6 catalyst plate, 7 first pump body, 8 second pump body, 9 hose, 10 diversion tube, 11 nozzle, 12 first liquid discharge port, 13 second liquid discharge port, 14 filter screen, 15 first threaded rod, 16 first slide bar, 17 second slide bar, 18 second threaded rod, 19 cavity, 20 brush layer, 21 transmission part, 22 flat port, 23 air inlet. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Reference Figure 1-Figure 3As shown, the flue gas denitration device of a coal-fired boiler includes a shell 1, a filter box 2 is fixedly connected to the left side of the shell 1, an air inlet 23 is opened on the left side of the filter box 2, an exhaust port 5 is arranged on the inner top of the shell 1, a plurality of catalytic plates 6 are installed at equal intervals inside the shell 1, a filter screen 14 is vertically installed in the filter box 2, a collecting box 3 is fixedly connected to the lower end of the filter box 2, the collecting box 3 is connected to the inner bottom of the filter box 2 through a plurality of first drain ports 12, a second drain port 13 is arranged on the inner bottom of the collecting box 3, and solenoid valves are installed in the second drain port 13 and the plurality of first drain ports 12; a denitration mechanism is also included, the denitration mechanism includes a diverter cylinder 10 symmetrically fixedly connected to the left and right side walls of the shell 1, a plurality of nozzles 11 are installed on opposite sides of the two diverter cylinders 10, the input ends of the plurality of nozzles 11 extend into the corresponding diverter cylinder 10, and the nozzles 11 are located on the left side. The shunt cylinder 10 is connected to the filter box 2 through a connecting port, and a first pump body 7 is installed on the right side of the shell 1, and the liquid outlet pipe of the first pump body 7 is connected to the shunt cylinder 10 on the right side, and the liquid inlet pipe of the first pump body 7 is connected to the external ammonia water tank, so as to realize the function of extracting and discharging ammonia water; it also includes a cleaning mechanism, and the cleaning mechanism is used to clean the filter screen 14, and the cleaning mechanism includes a first threaded rod 15 rotatably connected between the upper and lower inner walls of the filter box 2, and a first slide bar 16 is threadedly connected to the first threaded rod 15, and a brush layer 20 is arranged on the right side of the first slide bar 16, and the front and rear sides of the first slide bar 16 are both slidably connected to the front and rear inner walls of the filter box 2, and a second threaded rod 18 is rotatably connected between the upper and lower inner walls of the filter box 2, and a second slide bar 17 is threadedly connected to the second threaded rod 18, and the front and rear sides of the second slide bar 17 are both slidably connected to the front and rear inner walls of the filter box 2.

[0020] A second pump body 8 is fixedly connected to the right side of the shell 1, and a hose 9 is connected to the liquid outlet end of the second pump body 8. The liquid inlet end of the second pump body 8 is connected to an external water tank. A cavity 19 is provided in the second slide bar 17, and a flat opening 22 is provided on the left inner wall of the cavity 19. The other end of the hose 9 is connected to the cavity 19. The upper ends of the first threaded rod 15 and the second threaded rod 18 extend to the outside and are connected through a transmission member 21. The transmission member 21 includes two pulleys, which are respectively mounted on the first threaded rod 15 and the second threaded rod 18. The two pulleys are connected through a transmission belt. A motor 4 is installed at the upper end of the filter box 2. The output shaft of the motor 4 is fixedly connected to the upper end of the first threaded rod 15. The motor 4 is a servo motor that can change the direction of rotation.

[0021] When in use, after the flue gas enters from the air inlet 23, it is filtered by the filter 14 and then enters the diversion tube 10, and is diverted out through the multiple nozzles 11 on the left side. Then the first pump body 7 is started to draw the ammonia water into the diversion tube 10 on the right side, and spray it out from the multiple nozzles 11 on the right side, so that the ammonia water and the flue gas are fully in contact, achieving a better denitration effect, and then it is finally discharged from the exhaust port 5 through the catalytic plate 6; when it is necessary to clean the filter 14, the motor 4 is started, and the transmission member 21 is cooperated to make the first threaded rod 15 and the second threaded rod 18 rotate synchronously, and the first threaded rod 15 will make the first slide bar 16 and the brush layer 20 move down to clean the filter. The left side of the net 14 is cleaned, and the rotation of the second threaded rod 18 will move the second slide bar 17 downward, and at the same time, the second pump body 8 is started to discharge the water in the pump body cavity 19 from the flat port 22, and the filter screen 14 is backflushed. The cooperation of the two can achieve a better cleaning effect, and the dust can be dissolved in the water and then fall into the collection box 3 without adhering to the filter screen 14 for the second time. In addition, the use of backflushing can prevent the dust from passing through the filter screen 14 and entering the right side of the filter screen 14; when the collection box 3 needs to be cleaned, close the solenoid valves in the multiple first discharge ports 12, and then open the solenoid valve of the second discharge port 13 to discharge the waste water.

Claims

1. A coal-fired boiler flue gas denitrification device, characterized in that: include: A shell (1), wherein a filter box (2) is fixedly connected to the left side of the shell (1), an air inlet (23) is opened on the left side of the filter box (2), an air outlet (5) is arranged on the inner top of the shell (1), a plurality of catalytic plates (6) are installed at equal intervals inside the shell (1), and a filter screen (14) is vertically installed in the filter box (2); a denitration mechanism, wherein the denitration mechanism comprises a diversion cylinder (10) symmetrically fixedly connected to the left and right side walls of the shell (1), a plurality of nozzles (11) are installed on opposite sides of the two diversion cylinders (10), and the input ends of the plurality of nozzles (11) extend into the corresponding diversion cylinders (10), the diversion cylinder (10) on the left side is connected to the filter box (2) through a connecting port, a first pump body (7) is installed on the right side of the shell (1), and the liquid outlet pipe of the first pump body (7) is connected to the diversion cylinder (10) on the right side; and a cleaning mechanism, wherein the cleaning mechanism is used to clean the filter screen (14).

2. The coal-fired boiler flue gas denitrification device according to claim 1, characterized in that: The cleaning mechanism comprises a first threaded rod (15) rotatably connected between the upper and lower inner walls of the filter box (2); a first slide bar (16) is threadedly connected to the first threaded rod (15); a brush layer (20) is provided on the right side of the first slide bar (16); and the front and rear sides of the first slide bar (16) are slidably connected to the front and rear inner walls of the filter box (2).

3. The coal-fired boiler flue gas denitrification device according to claim 2, characterized in that: A second threaded rod (18) is rotatably connected between the upper and lower inner walls of the filter box (2), a second slide bar (17) is threadedly connected to the second threaded rod (18), and the front and rear sides of the second slide bar (17) are slidably connected to the front and rear inner walls of the filter box (2).

4. The coal-fired boiler flue gas denitrification device according to claim 3, characterized in that: A second pump body (8) is fixedly connected to the right side of the housing (1); a liquid outlet end of the second pump body (8) is connected to a hose (9); a cavity (19) is provided in the second slide bar (17); a flat opening (22) is provided on the left inner wall of the cavity (19); and the other end of the hose (9) is connected to the cavity (19).

5. The coal-fired boiler flue gas denitrification device according to claim 3, characterized in that: The upper ends of the first threaded rod (15) and the second threaded rod (18) both extend to the outside and are connected in transmission via a transmission member (21); the transmission member (21) comprises two pulleys, the two pulleys are respectively mounted on the first threaded rod (15) and the second threaded rod (18), and the two pulleys are connected in transmission via a transmission belt; a motor (4) is mounted on the upper end of the filter box (2), and an output shaft of the motor (4) is fixedly connected to the upper end of the first threaded rod (15).

6. The coal-fired boiler flue gas denitrification device according to claim 1, characterized in that: The lower end of the filter box (2) is fixedly connected to a collecting box (3); the collecting box (3) is in communication with the inner bottom of the filter box (2) via a plurality of first liquid discharge ports (12); a second liquid discharge port (13) is provided at the inner bottom of the collecting box (3); and electromagnetic valves are installed in the second liquid discharge port (13) and the plurality of first liquid discharge ports (12).

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