Flue gas denitration device for SNCR (selective non-catalytic reduction)

Abstract

The utility model relates to the technical field of flue gas treatment, and discloses an SNCR flue gas denitration device which comprises a denitration box, a dust removal box is fixedly connected below the left side of the denitration box, a gas inlet pipe is fixedly connected to the left side of the dust removal box, and an exhaust pipe is fixedly connected to the center of the upper surface of the denitration box. A liquid inlet pipe is fixedly connected to the upper portion of the right side of the denitration box, a liquid discharging pipe is fixedly connected to the lower portion of the right side of the denitration box, positioning plates are symmetrically and fixedly connected to the lower surface of the interior of the dust removal box, and a filtering device is arranged in the dust removal box and located in the two positioning plates; the front surface of the dust removal box is fixedly connected with a driving motor; and through the design of a cleaning plate and a brush in the dust removal box, in cooperation with a driving motor and a transmission mechanism of a threaded rod, automatic cleaning of the filtering device can be achieved, the service life of the filtering device is effectively prolonged, and the workload of manual maintenance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, and more particularly to a SNCR flue gas denitration device. Background Art

[0002] There are two main flue gas denitrification technologies: dry method (selective catalytic reduction flue gas denitrification SCR, selective non-catalytic reduction denitrification SNCR) and wet method. The SNCR system sprays nitrogen-containing reducing agent into the denitrification cylinder to contact the flue gas for denitrification reaction.

[0003] The existing SNCR flue gas denitrification device is prone to uneven spraying when spraying nitrogen-containing reducing agents, which can easily lead to incomplete flue gas denitrification, thereby reducing the denitrification rate of the device. At the same time, the existing SNCR flue gas denitrification device is generally unable to achieve self-cleaning during the preliminary dust removal before flue gas denitrification, thereby reducing the working efficiency of the device. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a SNCR flue gas denitrification device, which can solve the problem that the existing SNCR flue gas denitrification device is prone to uneven spraying when spraying nitrogen-containing reducing agents, which easily leads to incomplete flue gas denitrification, thereby reducing the denitrification rate of the device. At the same time, the existing SNCR flue gas denitrification device is generally unable to achieve self-cleaning during the preliminary dust removal before flue gas denitrification, thereby reducing the working efficiency of the device.

[0005] To solve the above technical problems, according to one aspect of the present invention, more specifically, a SNCR flue gas denitrification device includes a denitrification box, a dust removal box is fixedly connected to the lower left side of the denitrification box, an air intake pipe is fixedly connected to the left side of the dust removal box, an exhaust pipe is fixedly connected to the center of the upper surface of the denitrification box, a liquid inlet pipe is fixedly connected to the upper right side of the denitrification box, and a liquid discharge pipe is fixedly connected to the lower right side of the denitrification box;

[0006] The inner lower surface of the dust collector box is symmetrically fixedly connected with a positioning plate, and a filtering device is provided inside the dust collector box and inside the two positioning plates, the front surface of the dust collector box is fixedly connected with a driving motor, and the rear end of the output shaft of the driving motor is fixedly connected with a threaded rod, the rear end of the threaded rod is rotatably connected to the inner rear surface of the dust collector box via a rotating shaft, and the outer side wall of the threaded rod is threadedly connected with a cleaning plate, the upper surface and lower surface of the cleaning plate are respectively slidably connected to the inner upper surface and inner lower surface of the dust collector box, and a brush is fixedly connected to the right side of the cleaning plate, and the right side of the brush contacts the left side of the filter device.

[0007] Furthermore, a through-type plug-in slot is provided on the inner upper surface of the dust removal box, and a positioning U-shaped plate is provided inside the plug-in slot. The inner side wall of the positioning U-shaped plate is in contact with the upper surface of the filtering device. A sealing gasket is fixedly connected between the inside of the plug-in slot and the positioning U-shaped plate, and an operating panel is fixedly connected to the upper surface of the positioning U-shaped plate.

[0008] Furthermore, a waste box is fixedly connected to the left side of the lower surface of the dust removal box, and a through-type discharge trough is provided on the inner lower surface of the dust removal box and above the waste box. The discharge trough is communicated with the waste box, and a sealed door is rotatably connected to the left side of the waste box through a hinge.

[0009] Furthermore, the right side of the dust removal box is fixedly connected to an air supply port, the right side of the air supply port extends to the interior of the denitrification box, the inner upper surface of the air supply port is rotatably connected to a baffle via a rotating shaft, the lower surface of the baffle is in contact with the inner lower surface of the denitrification box, and the left side of the baffle is fixedly connected to the inner lower surface of the denitrification box by a reset spring.

[0010] Furthermore, the upper part of the inner front surface of the denitrification box is symmetrically connected to the infusion pipe through a rotating shaft, the upper surfaces of the two infusion pipes are fixedly connected to the hoses, the two hoses are fixedly connected to the liquid inlet pipes, the outer walls of the two infusion pipes are fixedly connected to a plurality of spray heads, the rear surface of the denitrification box and the rear of the two infusion pipes are provided with transmission gears, the centers of the front surfaces of the two transmission gears are respectively fixedly connected to the rear surfaces of the two infusion pipes, the rear surface of the denitrification box and the lower surfaces of the two transmission gears are fixedly connected to an electric cylinder, the top end of the output shaft of the electric cylinder is fixedly connected to a rack plate, the left and right sides of the rack plate are respectively engaged with the two transmission gears.

[0011] Furthermore, an oblique plate is fixedly connected to the inner lower surface of the denitrification box.

[0012] Furthermore, an observation window is integrally formed on the front surface of the denitration box, and a control center is integrally formed on the front surface of the denitration box and below the observation window.

[0013] Furthermore, a plurality of supporting legs are fixedly connected to the lower surface of the denitrification box.

[0014] The beneficial effects of the utility model for a SNCR flue gas denitrification device are:

[0015] The cleaning plate and brush design inside the dust removal box, combined with the transmission mechanism of the drive motor and threaded rod, can realize automatic cleaning of the filter device, effectively extend the service life of the filter device and reduce the workload of manual maintenance;

[0016] The filter unit is modularly installed and disassembled through the design of positioning U-shaped plates and plug-in slots, which facilitates replacement and maintenance. At the same time, the provision of waste boxes and discharge chutes also facilitates the collection and treatment of waste, extending the service life of the filter unit and thus reducing the denitrification budget of the device.

[0017] When the two liquid delivery pipes and multiple spray heads are controlled to rotate simultaneously by the provided electric cylinder, the reducing agent can be evenly sprayed into the flue gas through the multiple spray heads, thereby achieving efficient flue gas denitrification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a schematic diagram of the overall structure of an SNCR flue gas denitrification device of the present invention;

[0020] Figure 2 This is a schematic diagram of the front cross-section structure of a dust removal box and a waste box for an SNCR flue gas denitrification device according to the present invention;

[0021] Figure 3 This is a schematic diagram of the top view of the cross section of a denitrification box for an SNCR flue gas denitrification device according to the present invention;

[0022] Figure 4 This is a schematic diagram of a partial front view of a cross section of a denitrification box for an SNCR flue gas denitrification device according to the present invention;

[0023] Figure 5 This utility model is a kind of SNCR flue gas denitrification device Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 6 This utility model is a kind of SNCR flue gas denitrification device Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0025] In the figure: 1. Denitrification box; 2. Dust removal box; 3. Air inlet pipe; 4. Exhaust pipe; 5. Liquid inlet pipe; 6. Liquid discharge pipe; 7. Positioning plate; 8. Filter device; 9. Drive motor; 10. Threaded rod; 11. Cleaning plate; 12. Brush; 13. Connecting slot; 14. Positioning U-shaped plate; 15. Sealing gasket; 16. Operation panel; 17. Waste box; 18. Discharge chute; 19. Sealing door; 20. Air inlet; 21. Baffle; 22. Return spring; 23. Liquid inlet pipe; 24. Hose; 25. Sprinkler head; 26. Transmission gear; 27. Electric cylinder; 28. Rack plate; 29. ​​Oblique plate; 30. Observation window; 31. Control center; 32. Support leg. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0027] According to one aspect of the present invention:

[0028] like Figure 1 As shown, a SNCR flue gas denitrification device is provided, comprising a denitrification box 1, a dust removal box 2 is fixedly connected to the lower left side of the denitrification box 1, an air intake pipe 3 is fixedly connected to the left side of the dust removal box 2, and an exhaust pipe 4 is fixedly connected to the center of the upper surface of the denitrification box 1;

[0029] The flue gas to be treated is introduced into the dust removal box 2 through the provided air inlet pipe 3 to remove the dust and particulate matter therein, so as to prevent the dust and particulate matter from contaminating the denitration catalyst and reducing its activity, thereby affecting the denitration effect. The flue gas after dust removal is then transported to the interior of the denitration box 1 for denitration, and the denitration process is completed by being discharged through the provided exhaust pipe 4.

[0030] like Figure 1 As shown, an observation window 30 is integrally formed on the front surface of the denitrification box 1, and a control center 31 is integrally formed on the front surface of the denitrification box 1 and below the observation window 30;

[0031] The control center 31 facilitates real-time monitoring and control of the denitration process. Furthermore, the control center 31 automatically adjusts parameters such as the injection rate, temperature, and pressure of the reducing agent according to preset parameters and algorithms to ensure efficient denitration. Furthermore, the observation window 30 allows the operator to intuitively observe the denitration reaction process within the denitration tank 1.

[0032] A liquid inlet pipe 5 is fixedly connected to the upper right side of the denitrification box 1, and a liquid discharge pipe 6 is fixedly connected to the lower right side of the denitrification box 1;

[0033] The reducing agent (such as ammonia water or urea solution) is introduced into the denitrification box 1 through the provided liquid inlet pipe 5, so as to react with nitrogen oxides in the flue gas during the SNCR denitrification process and reduce them to nitrogen and water vapor. Finally, the waste liquid mixture is regularly discharged through the provided liquid discharge pipe 6, which can also prevent the waste liquid from accumulating in the denitrification box 1 and affecting the denitrification effect.

[0034] like Figure 2 and Figure 5As shown, the inner lower surface of the dust removal box 2 is symmetrically fixedly connected with a positioning plate 7, the interior of the dust removal box 2 and the interior of the two positioning plates 7 are provided with a filter device 8, the front surface of the dust removal box 2 is fixedly connected with a drive motor 9, the rear end of the output shaft of the drive motor 9 is fixedly connected with a threaded rod 10, the rear end of the threaded rod 10 is rotatably connected to the inner rear surface of the dust removal box 2 through a rotating shaft, the outer side wall of the threaded rod 10 is threadedly connected with a cleaning plate 11, the upper and lower surfaces of the cleaning plate 11 are respectively slidably connected to the inner upper surface and the inner lower surface of the dust removal box 2, a brush 12 is fixedly connected to the right side of the cleaning plate 11, and the right side of the brush 12 is in contact with the left side of the filter device 8;

[0035] The filter device 8 is provided to intercept dust and particulate matter in the flue gas, purify the flue gas, and provide clean raw materials for the subsequent denitrification process. At the same time, the material and structure of the filter device 8 need to have good filtering performance and durability to cope with high temperature, high pressure and corrosion. The two positioning plates 7 provided can effectively fix and support the filter device 8 to ensure its stability and accuracy during the dust removal process. When the device is in use, the threaded rod 10 can be controlled to rotate by starting the provided drive motor 9, so that the cleaning plate 11 can be controlled to move repeatedly on the outside of the filter device 8 through the threaded rod 10, and the brush 12 can be driven to move repeatedly through the cleaning plate 11. The dust and particulate matter attached to the surface of the filter device 8 can be effectively removed by the brush 12, so as to maintain the stability and efficiency of its filtering performance.

[0036] like Figure 2 As shown, a waste box 17 is fixedly connected to the left side of the lower surface of the dust removal box 2, and a through-type discharge chute 18 is opened on the inner lower surface of the dust removal box 2 and above the waste box 17. The discharge chute 18 is connected to the waste box 17, and a sealed door 19 is rotatably connected to the left side of the waste box 17 through a hinge;

[0037] When the brush 12 is controlled by the drive motor 9 to move repeatedly to clean the dust and particulate matter attached to the outside of the filter device 8, the slope design inside the dust removal box 2 allows the dust and particulate matter to fall better from the discharge chute 18 to the inside of the waste box 17. The dust and particulate matter can be stored centrally through the waste box 17 to prevent a certain degree of impact on the environment. When the device stops, the waste can be cleaned through the provided sealing door 19, and finally the sealing door 19 is closed to keep the waste box 17 sealed, which is convenient for subsequent dust removal of smoke.

[0038] like Figure 1 As shown, a plurality of support legs 32 are fixedly connected to the lower surface of the denitrification box 1;

[0039] The multiple support legs 32 can ensure the stable operation of the entire denitrification device, which not only provides the necessary support and stability, but also provides strong guarantees for the safe operation and efficient work of the denitrification device through functions such as dispersing weight and adjusting height.

[0040] like Figure 2 and Figure 5 As shown, a through-type plug-in slot 13 is provided on the inner upper surface of the dust removal box 2, and a positioning U-shaped plate 14 is provided inside the plug-in slot 13. The inner side wall of the positioning U-shaped plate 14 contacts the upper surface of the filter device 8. A sealing gasket 15 is fixedly connected between the interior of the plug-in slot 13 and the positioning U-shaped plate 14, and an operating plate 16 is fixedly connected to the upper surface of the positioning U-shaped plate 14.

[0041] The positioning U-shaped plate 14 can be pulled out of the interior of the insertion groove 13 by pulling the provided operating panel 16 upwards, and then the internal filter device 8 can be taken out for replacement or cleaning. After that, the new or cleaned filter device 8 is replaced between the two positioning plates 7, and the positioning U-shaped plate 14 is reinserted into the interior of the insertion groove 13 through the operating panel 16. The U-shaped positioning U-shaped plate 14 and the close contact between its inner side wall and the upper surface of the filter device 8 can improve the stability of the filter device 8. At the same time, the provided sealing gasket 15 can effectively ensure the sealing of the interior of the dust removal box 2 to prevent smoke leakage.

[0042] like Figure 2 、 Figure 4 and Figure 6 As shown, the right side of the dust removal box 2 is fixedly connected to the air supply port 20, and the right side of the air supply port 20 extends to the interior of the denitrification box 1. The inner upper surface of the air supply port 20 is rotatably connected to a baffle 21 via a rotating shaft. The lower surface of the baffle 21 contacts the inner lower surface of the denitrification box 1. The left side of the baffle 21 is fixedly connected to the inner lower surface of the denitrification box 1 with a return spring 22.

[0043] After the smoke passes through the filter device 8 for preliminary dust removal, it is discharged to the interior of the denitrification box 1 through the provided gas outlet 20 for denitrification treatment. The baffle 21 is rotated to the open position by the flow of gas, allowing the smoke to pass through. When denitrification is carried out inside the denitrification box 1, the baffle 21 can be reset to the closed position by the provided reset spring 22, which can effectively prevent the smoke from flowing out of the gas outlet 20, preventing the smoke from leaking into the denitrification box 1 when not needed, and also preventing the reducing agent inside the denitrification box 1 from leaking into the interior of the dust removal box 2, thereby improving the stability and reliability of the device.

[0044] like Figure 3As shown, the upper front surface of the inner portion of the denitrification box 1 is symmetrically connected to a liquid infusion pipe 23 through a rotating shaft, and the upper surfaces of the two liquid infusion pipes 23 are fixedly connected to a hose 24, and the two hoses 24 are fixedly connected to the liquid inlet pipe 5. The outer walls of the two liquid infusion pipes 23 are fixedly connected to a plurality of spray heads 25;

[0045] When the dust-removed flue gas enters the interior of the denitrification box 1, the reducing agent (such as ammonia water or urea solution) is transported to the interior of the two liquid infusion pipes 23 through the two hoses 24 provided through the liquid inlet pipe 5, and then is pressurized and sprayed out through multiple spray heads 25 on the outside of the two liquid infusion pipes 23. The multiple spray heads 25 will atomize the reducing agent into fine droplets, which react with nitrogen oxides in the flue gas, thereby achieving the denitrification effect.

[0046] like Figure 3 As shown, a transmission gear 26 is provided on the rear surface of the denitrification box 1 and behind the two liquid infusion pipes 23. The centers of the front surfaces of the two transmission gears 26 are respectively fixedly connected to the rear surfaces of the two liquid infusion pipes 23. An electric cylinder 27 is fixedly connected to the rear surface of the denitrification box 1 and below the two transmission gears 26. The top end of the output shaft of the electric cylinder 27 is fixedly connected to a rack plate 28. The left and right sides of the rack plate 28 are respectively engaged with the two transmission gears 26.

[0047] By starting the electric cylinder 27 to control the up and down movement of the rack plate 28 to simultaneously drive the two transmission gears 26 to rotate slightly, the two transmission gears 26 can be used to control the two infusion pipes 23 to rotate simultaneously inside the denitrification box 1, and the spraying direction and angle of the two infusion pipes 23 can be adjusted, thereby achieving comprehensive spray coverage of the flue gas inside the denitrification box 1 and improving the denitrification rate of the flue gas.

[0048] like Figure 4 As shown, an oblique plate 29 is fixedly connected to the inner lower surface of the denitrification box 1;

[0049] The inclined plate 29 provided in the denitrification box 1 plays an important role in drainage, guiding, preventing water accumulation and optimizing the layout, while improving the denitrification effect and keeping the equipment clean.

[0050] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the scope of protection of the present invention.

Claims

1. A SNCR flue gas denitrification device, comprising a denitrification box (1), characterized in that: A dust removal box (2) is fixedly connected to the lower left side of the denitration box (1), an air intake pipe (3) is fixedly connected to the left side of the dust removal box (2), an exhaust pipe (4) is fixedly connected to the center of the upper surface of the denitration box (1), a liquid inlet pipe (5) is fixedly connected to the upper right side of the denitration box (1), and a liquid discharge pipe (6) is fixedly connected to the lower right side of the denitration box (1); The inner lower surface of the dust removal box (2) is symmetrically fixedly connected with a positioning plate (7), and a filtering device (8) is provided inside the dust removal box (2) and inside the two positioning plates (7). The front surface of the dust removal box (2) is fixedly connected with a driving motor (9), and the rear end of the output shaft of the driving motor (9) is fixedly connected with a threaded rod (10). The rear end of the threaded rod (10) is rotatably connected to the inner rear surface of the dust removal box (2) through a rotating shaft. The outer wall of the threaded rod (10) is threadedly connected with a cleaning plate (11), and the upper surface and lower surface of the cleaning plate (11) are respectively slidably connected to the inner upper surface and inner lower surface of the dust removal box (2). The right side of the cleaning plate (11) is fixedly connected with a brush (12), and the right side of the brush (12) contacts the left side of the filtering device (8).

2. The SNCR flue gas denitrification device according to claim 1, characterized in that: A through-type plug-in slot (13) is provided on the inner upper surface of the dust removal box (2), a positioning U-shaped plate (14) is provided inside the plug-in slot (13), an inner side wall of the positioning U-shaped plate (14) is in contact with the upper surface of the filter device (8), a sealing gasket (15) is fixedly connected between the inside of the plug-in slot (13) and the positioning U-shaped plate (14), and an operating panel (16) is fixedly connected to the upper surface of the positioning U-shaped plate (14).

3. The SNCR flue gas denitrification device according to claim 1, characterized in that: A waste box (17) is fixedly connected to the left side of the lower surface of the dust removal box (2), and a through-type discharge chute (18) is provided on the inner lower surface of the dust removal box (2) and above the waste box (17). The discharge chute (18) is connected to the waste box (17), and a sealing door (19) is rotatably connected to the left side of the waste box (17) via a hinge.

4. The SNCR flue gas denitrification device according to claim 1, characterized in that: The right side of the dust removal box (2) is fixedly connected to an air delivery port (20), the right side of the air delivery port (20) extends to the interior of the denitration box (1), the inner upper surface of the air delivery port (20) is rotatably connected to a baffle (21) via a rotating shaft, the lower surface of the baffle (21) contacts the inner lower surface of the denitration box (1), and the left side of the baffle (21) is fixedly connected to the inner lower surface of the denitration box (1) by a return spring (22).

5. The SNCR flue gas denitrification device according to claim 1, characterized in that: A liquid infusion pipe (23) is symmetrically connected to the upper front surface of the denitrification box (1) through a rotating shaft, and the upper surfaces of the two liquid infusion pipes (23) are fixedly connected to a hose (24), and the two hoses (24) are fixedly connected to the liquid inlet pipe (5). The outer walls of the two liquid infusion pipes (23) are fixedly connected to a plurality of spray heads (25). The rear surface of the denitrification box (1) and the rear of the two liquid infusion pipes (23) are provided with a transmission gear (26). The front centers of the two transmission gears (26) are respectively fixedly connected to the rear surfaces of the two liquid infusion pipes (23). The rear surface of the denitrification box (1) and the lower surfaces of the two transmission gears (26) are fixedly connected to an electric cylinder (27). The top end of the output shaft of the electric cylinder (27) is fixedly connected to a rack plate (28), and the left and right sides of the rack plate (28) are respectively engaged with the two transmission gears (26).

6. The SNCR flue gas denitrification device according to claim 1, characterized in that: An oblique plate (29) is fixedly connected to the inner lower surface of the denitrification box (1).

7. The SNCR flue gas denitrification device according to claim 1, characterized in that: An observation window (30) is integrally formed on the front surface of the denitration box (1), and a control center (31) is integrally formed on the front surface of the denitration box (1) and below the observation window (30).

8. The SNCR flue gas denitrification device according to claim 1, characterized in that: A plurality of support legs (32) are fixedly connected to the lower surface of the denitrification box (1).

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