Flue gas denitration equipment for coal-fired unit

Abstract

The utility model discloses flue gas denitration equipment for a coal-fired unit, which comprises a purification box, sliding frames are arranged on the inner walls of two sides of the purification box, a filter screen is slidably mounted in the purification box between the sliding frames, a bracket is arranged on the inner wall of the purification box in front of the filter screen, and a blowdown machine cavity is arranged on the outer wall of one side of the lower end of the purification box. A heat recovery box is arranged on the outer wall of the purification box above the blowdown machine cavity, a snakelike heat exchange pipe is arranged in the heat recovery box through a support, an air outlet pipe is arranged at one end of the snakelike heat exchange pipe, the end, away from the snakelike heat exchange pipe, of the air outlet pipe extends into the purification box, and an air injection pipe is arranged at the other end of the snakelike heat exchange pipe; the outer wall of the S-shaped heat exchange pipe is sleeved with heat exchange fins at equal intervals. According to the utility model, not only is the phenomenon of heat energy loss reduced so as to improve the energy-saving property of the denitration equipment in use, but also the phenomenon of leakage generated in the flue gas injection process is reduced, and the aim of easily replacing and maintaining the filter screen is achieved.

Description

Technical Field

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

[0002] With the improvement of environmental awareness, more and more attention has been paid to the control of NOx in the flue gas emitted by coal-fired units. If the flue gas generated by the coal-fired units is directly discharged into the air, it will easily cause environmental pollution. Therefore, corresponding denitrification equipment is needed to denitrify and purify the flue gas.

[0003] Reference announcement number CN215216296U is a new type of flue gas denitrification device for a coal-fired power generation unit, which includes a base and a denitrification device body. The base is connected to a rotating block, which is rotatably connected to a pair of rollers through a rotating rod. A mobile motor is installed on the base, and the output end of the mobile motor is connected to a main gear. The rotating rod is connected to a slave gear. The base is rotatably connected to a steering rod, which passes through the base and is connected to a steering seat. The steering seat is rotatably connected to a pair of steering wheels. The base is rotatably installed with a hydraulic cylinder through an articulated seat, and the base is rotatably connected to a rotating plate through a support plate. The rotating plate is connected to multiple rotating seats through multiple rotating columns, and the base is connected to a lifting frame through an auxiliary device. The rotating seat and the lifting frame are rotatably connected, and the denitrification device body is connected to the top of the lifting frame, which is convenient for moving the denitrification device body and has good flexibility in use. It is also convenient for adjusting the height of the denitrification device body and has low limitations in use. According to the above, although the denitrification equipment can be well applied, it is usually not convenient for absorbing and utilizing the heat energy in the flue gas, which makes it easy for the heat energy to be lost, thereby causing waste of energy and often troubling users. Summary of the Invention

[0004] The purpose of the present invention is to provide a flue gas denitrification device for a coal-fired unit, so as to solve the problem proposed in the above background technology that although the denitrification equipment can be well applied, it is usually not convenient to absorb and utilize the heat energy in the flue gas, which makes the heat energy easily lost, thereby causing energy waste.

[0005] The smoke screen is slidably mounted on the interior wall of the smoke screen, and a filter is installed in the smoke screen chamber between the smoke screen and the filter housing, the filter housing having a plurality of filter covers, each of which has a plurality of filter covers on its interior wall.

[0006] Preferably, an exhaust port is provided at the center position of the top of the purification box, and an injection pipe is provided inside the purification box below the exhaust port. One end of the injection pipe extends to the outside of the purification box. Through the setting of the injection pipe, the denitrification liquid can be injected into the interior of the strip tube.

[0007] Preferably, a liquid inlet is provided on the outer wall of the heat recovery box away from the purification box, and a liquid outlet is provided on the outer wall of the heat recovery box below the liquid inlet. The liquid inlet and the liquid outlet are arranged so that the water source inside the heat recovery box can be injected and discharged.

[0008] Preferably, strip tubes with equal spacing are provided inside the purification box below the injection pipe, the top of the strip tubes is connected to the bottom of the injection pipe, and the bottom of the strip tubes is installed with an atomizing nozzle. The atomizing nozzle is set so that the denitrification liquid can be atomized and sprayed into the purification box.

[0009] Preferably, a clamp is installed on the outer side of the upper end of the gas injection pipe, and a sealing ring is provided on the inner wall of the clamp. The inner wall of the sealing ring touches the outer wall of the gas injection pipe. The sealing ring is provided to seal the connection position between the gas injection pipe and the flue gas supply pipe.

[0010] Preferably, a locking nut is provided on the outer wall of one side of the clamp, and the internal thread of the locking nut is connected to a stud. One end of the stud passes through the clamp and is provided with a nut. One end of the nut passes through the clamp and is screwed into the locking nut so that the clamp can be installed on the outer wall of the upper end of the air injection pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the flue gas denitrification equipment for coal-fired units not only reduces the loss of heat energy, thereby improving the energy saving of the denitrification equipment during use, but also reduces the leakage during the flue gas injection process, and achieves the purpose of facilitating the replacement and maintenance of the filter screen;

[0012] The flue gas generated by the coal-fired unit is injected into the serpentine heat exchange tube through the gas injection pipe. The flue gas circulates inside the serpentine heat exchange tube and is discharged into the purification box through the gas outlet pipe. When water is injected into the heat recovery box through the liquid inlet, the serpentine heat exchange tube cooperates with the heat exchange fins to transfer the heat energy in the flue gas to the water source, so as to achieve the purpose of heat energy recovery and utilization, thereby reducing the phenomenon of heat energy loss and improving the energy saving of the denitrification equipment.

[0013] By rotating the nut, it drives one end of the stud to pass through the clamp and screw into the lock nut. The clamp can then be installed on the outer side of the upper end of the gas injection pipe. The sealing ring seals the connection between the gas injection pipe and the flue gas supply pipe, thereby reducing leakage during the flue gas injection process.

[0014] By opening the door on the surface of the purification box and then pulling the filter so that the filter slides inside the sliding frame, the filter can be removed to the outside of the purification box, thereby achieving the purpose of easy replacement and maintenance of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0017] Figure 3 For this utility model Figure 2 A in the middle is an enlarged structural diagram;

[0018] Figure 4 This is a schematic diagram of the top view of the clamp structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the top view of the heat exchange fin structure of the utility model.

[0020] In the figure: 1. Purification box; 2. Support legs; 3. Sewage machine cavity; 4. Heat recovery box; 401. Liquid inlet; 402. Liquid outlet; 5. Exhaust port; 6. Filter; 7. Bracket; 8. Sliding frame; 9. Liquid injection pipe; 10. Strip pipe; 11. Atomizing nozzle; 12. Serpentine heat exchange tube; 13. Heat exchange fin; 14. Air injection pipe; 15. Air outlet pipe; 16. Clamp; 1601. Sealing ring; 17. Locking nut; 18. Nut; 19. Stud. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-5 The utility model provides an embodiment of a flue gas denitrification device for a coal-fired unit, comprising a purification box 1, an exhaust port 5 being provided at the center of the top of the purification box 1, an injection pipe 9 being provided inside the purification box 1 below the exhaust port 5, and one end of the injection pipe 9 extending to the outside of the purification box 1;

[0023] When in use, the injection pipe 9 is provided so as to inject the denitrification liquid into the interior of the strip tube 10;

[0024] Inside the purification box 1 below the injection pipe 9, there are strip pipes 10 with equal spacing. The top of the strip pipe 10 is connected to the bottom of the injection pipe 9. The bottom of the strip pipe 10 is equipped with an atomizing nozzle 11.

[0025] When in use, the atomizing nozzle 11 is provided so as to atomize and spray the denitrification liquid into the purification box 1;

[0026] Sliding frames 8 are provided on the inner walls on both sides of the purification box 1, and a filter 6 is slidably installed inside the purification box 1 between the sliding frames 8. A bracket 7 is provided on the inner wall of the purification box 1 in front of the filter 6. The inner wall of the bracket 7 touches the outer wall of the filter 6. A sewage machine cavity 3 is provided on the outer wall of one side of the lower end of the purification box 1, and a heat recovery box 4 is provided on the outer wall of the purification box 1 above the sewage machine cavity 3. A liquid inlet 401 is provided on the outer wall of the heat recovery box 4 away from the purification box 1, and a liquid outlet 402 is provided on the outer wall of the heat recovery box 4 below the liquid inlet 401;

[0027] When in use, the liquid inlet 401 and the liquid outlet 402 are provided so as to inject and discharge water into and out of the heat recovery tank 4;

[0028] A serpentine heat exchange tube 12 is provided inside the heat recovery box 4 through a bracket. An outlet pipe 15 is provided at one end of the serpentine heat exchange tube 12. The outlet pipe 15 extends to the interior of the purification box 1 away from the end of the serpentine heat exchange tube 12. An air injection pipe 14 is provided at the other end of the serpentine heat exchange tube 12. The air injection pipe 14 extends to the outside of the heat recovery box 4 away from the end of the serpentine heat exchange tube 12. A clamp 16 is installed on the outer side of the upper end of the air injection pipe 14. A sealing ring 1601 is provided on the inner wall of the clamp 16. The inner wall of the sealing ring 1601 touches the outer wall of the air injection pipe 14.

[0029] When in use, the sealing ring 1601 is provided to seal the connection between the gas injection pipe 14 and the flue gas supply pipe;

[0030] A locking nut 17 is provided on the outer wall of one side of the clamp 16. The inner thread of the locking nut 17 is connected to a stud 19. One end of the stud 19 passes through the clamp 16 and is provided with a nut 18.

[0031] When in use, one end of the nut 18 is passed through the clamp 16 and screwed into the lock nut 17 so that the clamp 16 is installed on the outer wall of the upper end of the gas injection pipe 14;

[0032] The outer wall of the serpentine heat exchange tube 12 is provided with heat exchange fins 13 at equal intervals, and the corner positions of the bottom end of the purification box 1 are all provided with supporting legs 2.

[0033] When the embodiment of the present application is in use, the flue gas generated by the coal-fired unit is first injected into the serpentine heat exchange tube 12 through the air injection pipe 14. The flue gas circulates inside the serpentine heat exchange tube 12 and is discharged into the purification box 1 through the air outlet pipe 15. When the water source is injected into the interior of the heat recovery box 4 from the liquid inlet 401, the serpentine heat exchange tube 12 can cooperate with the heat exchange fins 13 to exchange the heat energy in the flue gas to the water source, so as to recycle the heat energy in the flue gas. The water source inside the heat recovery box 4 can be discharged through the liquid outlet 402 to replace the water source inside the heat recovery box 4. After that, the flue gas flows into the lower end of the interior of the purification box 1 and flows upward, so that the filter 6 performs preliminary filtration on the flue gas. Subsequently, the denitrification liquid is injected into the strip tube 10 through the liquid injection pipe 9 to make the denitrification liquid atomized. The nozzle 11 sprays the atomized gas inside the purification box 1 and contacts the flue gas after the initial filtration, so as to achieve the purpose of denitrification and purification of the flue gas. The denitrified and purified gas will be discharged from the exhaust port 5, and then by rotating the nut 18, it drives one end of the stud 19 to pass through the clamp 16 and screw into the locking nut 17, and the clamp 16 can be installed on the outside of the upper end of the gas injection pipe 14, so that the connection position between the gas injection pipe 14 and the flue gas supply pipe is sealed by the sealing ring 1601 to reduce the leakage during the flue gas supply process. Finally, by opening the door of the purification box 1, the filter 6 is pulled so that the filter 6 slides on the inner side of the sliding frame 8 and is removed to the outside of the purification box 1, so that the filter 6 can be easily replaced and maintained, thereby completing the use of the denitrification equipment.

Claims

1. A flue gas denitrification device for a coal-fired unit, characterized by: The invention comprises a purification box (1), wherein a sliding frame (8) is provided on the inner wall of both sides of the purification box (1), a filter (6) is slidably installed inside the purification box (1) between the sliding frames (8), a bracket (7) is provided on the inner wall of the purification box (1) in front of the filter (6), the inner wall of the bracket (7) touches the outer wall of the filter (6), a sewage machine cavity (3) is provided on the outer wall of one side of the lower end of the purification box (1), a heat recovery box (4) is provided on the outer wall of the purification box (1) above the sewage machine cavity (3), and a snake is provided inside the heat recovery box (4) through a bracket. A serpentine heat exchange tube (12) is provided at one end thereof with an air outlet pipe (15), the air outlet pipe (15) extending from one end of the serpentine heat exchange tube (12) to the interior of the purification box (1), the other end of the serpentine heat exchange tube (12) is provided with an air injection pipe (14), the air injection pipe (14) extending from one end of the serpentine heat exchange tube (12) to the exterior of the heat recovery box (4), the outer wall of the serpentine heat exchange tube (12) is provided with heat exchange fins (13) at equal intervals, and support legs (2) are provided at the corner positions of the bottom end of the purification box (1).

2. The flue gas denitrification equipment for a coal-fired unit according to claim 1, characterized in that: An exhaust port (5) is provided at the center of the top of the purification box (1), and a liquid injection pipe (9) is provided inside the purification box (1) below the exhaust port (5), with one end of the liquid injection pipe (9) extending to the outside of the purification box (1).

3. The flue gas denitrification equipment for a coal-fired unit according to claim 1, characterized in that: A liquid inlet (401) is provided on the outer wall of the heat recovery box (4) on the side away from the purification box (1), and a liquid outlet (402) is provided on the outer wall of the heat recovery box (4) below the liquid inlet (401).

4. The flue gas denitrification equipment for a coal-fired unit according to claim 2, characterized in that: The purification box (1) below the liquid injection pipe (9) is provided with strip tubes (10) at equal intervals inside, the top ends of the strip tubes (10) are connected to the bottom ends of the liquid injection pipe (9), and the bottom ends of the strip tubes (10) are all equipped with atomizing nozzles (11).

5. The flue gas denitrification equipment for a coal-fired unit according to claim 1, characterized in that: A clamp (16) is installed on the outer side of the upper end of the gas injection pipe (14), and a sealing ring (1601) is provided on the inner wall of the clamp (16), and the inner wall of the sealing ring (1601) contacts the outer wall of the gas injection pipe (14).

6. The flue gas denitrification equipment for a coal-fired unit according to claim 5, characterized in that: A locking nut (17) is provided on the outer wall of one side of the clamp (16), and the internal thread of the locking nut (17) is connected to a stud (19), and one end of the stud (19) passes through the clamp (16) and is provided with a nut (18).

Images