Flue gas denitration atomization device

Abstract

The utility model discloses a flue gas denitration atomization device which comprises a tower body, a flue gas inlet is formed in the side wall of the bottom of the tower body, and a lower atomization assembly and an upper atomization assembly are sequentially arranged in the tower body from bottom to top, a reducing agent snakelike heat exchange pipe positioned above the flue gas inlet and a heat exchange water snakelike heat exchanger staggered with the reducing agent snakelike heat exchange pipe are arranged at the bottom in the tower body; an inlet of the reducing agent snakelike heat exchange pipe is connected with a reducing agent storage box positioned outside the tower body through a first reducing agent pipeline; an outlet of the reducing agent snakelike heat exchange pipe is connected with a reducing agent heat preservation heating box located outside the tower body through a second reducing agent pipeline, and an outlet of the reducing agent heat preservation heating box is connected with the lower atomization assembly and the upper atomization assembly through a third reducing agent pipeline; an inlet of the heat exchange water snakelike heat exchanger is connected with a cold water source through a water diversion pipeline. The flue gas denitration device can improve the flue gas denitration effect and realize flue gas heat recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of atomization devices, and particularly relates to a flue gas denitration atomization device. Background Technique

[0002] Nitrogen oxides in flue gas can stimulate the lungs, making it more difficult for people to resist respiratory diseases such as colds. People with respiratory problems, such as asthma patients, are more susceptible to the influence of nitrogen dioxide. For children, nitrogen oxides may also cause damage to lung development. Therefore, it is necessary to carry out denitration treatment on flue gas.

[0003] Denitration refers to removing nitrogen oxides in flue gas to prevent environmental pollution. In the prior art, the atomization denitration process is often used for treatment. However, in most existing atomization denitration devices, the atomization temperature of the reducing agent cannot be adjusted, which reduces the reaction effect between the reducing agent and the flue gas, resulting in poor denitration effect. Moreover, when the flue gas temperature is relatively high, it mostly exceeds the maximum temperature required for the reaction, which also makes the denitration effect worse. At the same time, a large amount of heat contained in the flue gas is not recovered, causing waste of resources. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a flue gas denitration atomization device to solve the problems put forward in the background technique.

[0005] To solve the above technical problems, the technical solutions adopted by the utility model are as follows.

[0006] A flue gas denitration atomization device includes a tower body and a PLC controller; a flue gas inlet is arranged on the bottom side wall of the tower body, a flue gas outlet is arranged at the top of the tower body, and a lower atomization component and an upper atomization component are sequentially arranged in the tower body from bottom to top. Among them, a reducing agent serpentine heat exchange tube located above the flue gas inlet and a heat exchange water serpentine heat exchanger arranged in an alternating manner with the reducing agent serpentine heat exchange tube are arranged at the bottom inside the tower body;

[0007] The inlet of the reducing agent serpentine heat exchange tube is connected to a reducing agent storage tank located outside the tower body through a first reducing agent pipeline, and a first pump is arranged on the first reducing agent pipeline for pumping the reducing agent in the reducing agent storage tank into the reducing agent serpentine heat exchange tube; the outlet of the reducing agent serpentine heat exchange tube is connected to a reducing agent heat preservation and heating tank located outside the tower body through a second reducing agent pipeline, and the outlet of the reducing agent heat preservation and heating tank is respectively connected to the lower atomization component and the upper atomization component through a third reducing agent pipeline, and a second pump is arranged on the third reducing agent pipeline for pumping the reducing agent in the reducing agent heat preservation and heating tank into the lower atomization component and the upper atomization component;

[0008] The inlet of the heat exchange water snake-shaped heat exchanger is connected to a cold water source through a water diversion pipeline, and a third pump is arranged on the water diversion pipeline for pumping cold water into the heat exchange water snake-shaped heat exchanger; the outlet of the heat exchange water snake-shaped heat exchanger is connected to a water outlet pipeline for supplying hot water outwards.

[0009] The output end of the PLC controller is respectively connected to the controlled ends of the first pump, the second pump and the third pump.

[0010] Preferably, a diversion fan is arranged at the bottom inside the tower below the flue gas outlet for providing upward wind from the bottom of the tower to divert the flue gas, and the controlled end of the diversion fan is connected to the output end of the PLC controller.

[0011] Preferably, a lower catalytic reaction layer is arranged inside the tower above the reducing agent snake-shaped heat exchange tube and the heat exchange water snake-shaped heat exchanger and below the lower atomization assembly, an upper catalytic reaction layer is arranged between the lower atomization assembly and the upper atomization assembly, and a demister is arranged above the upper atomization assembly.

[0012] Preferably, a first reducing agent temperature sensor for detecting the temperature of the reducing agent is arranged inside the reducing agent storage tank; the reducing agent storage tank is also connected to the lower atomization assembly and the upper atomization assembly through a fourth reducing agent pipeline, and a fourth pump is arranged on the fourth reducing agent pipeline for directly pumping the reducing agent in the reducing agent storage tank into the lower atomization assembly and the upper atomization assembly; the input end of the PLC controller is connected to the output end of the first reducing agent temperature sensor, and the output end of the PLC controller is connected to the controlled end of the fourth pump.

[0013] Preferably, the lower atomization assembly includes a spiral coil pipe respectively connected to the third reducing agent pipeline and the fourth reducing agent pipeline, and a plurality of atomizing nozzles arranged downward are uniformly arranged on the lower side wall of the spiral coil pipe; the upper atomization assembly has the same structure as the lower atomization assembly and the connection mode with the third reducing agent pipeline and the fourth reducing agent pipeline is also the same as that of the lower atomization assembly.

[0014] Preferably, an inlet nitrogen oxide sensor and an inlet temperature sensor are arranged at the bottom inside the tower near the flue gas inlet, and an outlet nitrogen oxide sensor and an outlet temperature sensor are arranged at the top inside the tower near the flue gas outlet; the input end of the PLC controller is respectively connected to the output ends of the inlet nitrogen oxide sensor, the inlet temperature sensor, the outlet nitrogen oxide sensor and the outlet temperature sensor.

[0015] Preferably, the reducing agent heat preservation and heating box is a heat preservation box body. A second reducing agent temperature sensor is arranged inside the heat preservation box body, and an electric heating tube for heating the reducing agent is embedded on the inner wall of the heat preservation box body; the input end of the PLC controller is connected to the output end of the second reducing agent temperature sensor, and the output end of the PLC controller is connected to the controlled end of the electric heating tube.

[0016] Preferably, support legs and a sewage outlet are arranged at the bottom of the tower body.

[0017] Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is as follows.

[0018] By arranging the reducing agent serpentine heat exchange tube, the heat exchange water serpentine heat exchanger, the reducing agent storage tank connected to the reducing agent serpentine heat exchange tube, and the reducing agent heat preservation and heating box, the present utility model can utilize the heat of the flue gas to adjust the temperature of the reducing agent, and recover the heat of the flue gas while ensuring the reaction requirements of the flue gas temperature, so as to achieve the best denitration effect and maximize the recovery of the heat of the flue gas. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the present utility model.

[0020] Wherein: 1. Tower body, 2. Flue gas inlet, 3. Inlet nitrogen oxide sensor, 4. Inlet temperature sensor, 5. Diversion fan, 6. Reducing agent serpentine heat exchange tube, 7. Heat exchange water serpentine heat exchanger, 8. Lower catalytic reaction layer, 9. Lower atomization assembly, 91. Spiral coil pipe, 92. Atomizing nozzle, 10. Upper catalytic reaction layer, 11. Upper atomization assembly, 12. Demister, 13. Flue gas outlet, 14. Outlet nitrogen oxide sensor, 15. Outlet temperature sensor, 16. Reducing agent storage tank, 17. Reducing agent heat preservation and heating box, 18. Electric heating tube, 19. First reducing agent temperature sensor, 20. First pump, 21. Second pump, 22. Third pump, 23. Fourth pump, 24. Second reducing agent temperature sensor, 25. Sewage outlet, 26. Support leg. Detailed Embodiments

[0021] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0022] A flue gas denitration atomization device, in combination with Figure 1As shown in the figure, it includes a tower body 1. A flue gas inlet 2 is provided on the bottom side wall of the tower body 1, and a flue gas outlet 13 is provided at the top of the tower body 1. Inside the tower body 1, a lower catalytic reaction layer 8, a lower atomization assembly 9, an upper catalytic reaction layer 10, an upper atomization assembly 11 and a demister 12 are arranged in sequence from bottom to top; a reducing agent serpentine heat exchange tube 6 and a heat exchange water serpentine heat exchanger 7 are arranged at the bottom inside the tower body 1. The reducing agent serpentine heat exchange tube 6 and the heat exchange water serpentine heat exchanger 7 are located above the flue gas inlet 2 and below the lower catalytic reaction layer 8, and the reducing agent serpentine heat exchange tube 6 and the heat exchange water serpentine heat exchanger 7 are arranged in an interleaved manner.

[0023] The inlet of the reducing agent serpentine heat exchange tube 6 is connected to a reducing agent storage tank 16 through a first reducing agent pipeline. The reducing agent storage tank 16 is located outside the tower body 1, and it contains a reducing agent inside, and is provided with a first reducing agent temperature sensor 19. The first reducing agent temperature sensor 19 is used to detect the temperature of the reducing agent in the reducing agent storage tank 16; a first pump 20 is arranged on the first reducing agent pipeline. The first pump 20 is used to pump the reducing agent in the reducing agent storage tank 16 into the reducing agent serpentine heat exchange tube 6. The outlet of the reducing agent serpentine heat exchange tube 6 is connected to a reducing agent heat preservation and heating tank 17 through a second reducing agent pipeline. The reducing agent heat preservation and heating tank 17 is located outside the tower body 1 and is a heat preservation box body. A second reducing agent temperature sensor 24 is arranged inside the heat preservation box body. The second reducing agent temperature sensor 24 is used to detect the temperature of the reducing agent in the reducing agent heat preservation and heating tank 17. Electric heating tubes 18 are embedded on the inner wall of the heat preservation box body. The electric heating tubes 18 are used to heat the reducing agent; the outlet of the reducing agent heat preservation and heating tank 17 is respectively connected to the lower atomization assembly 9 and the upper atomization assembly 11 through a third reducing agent pipeline. A second pump 21 is arranged on the third reducing agent pipeline. The second pump 21 is used to pump the reducing agent in the reducing agent heat preservation and heating tank 17 into the lower atomization assembly 9 and the upper atomization assembly 11. During use, the first pump 20 pumps the low-temperature reducing agent in the reducing agent storage tank 16 into the reducing agent serpentine heat exchange tube 6. The low-temperature reducing agent exchanges heat with the high-temperature flue gas and is heated up and then enters the reducing agent heat preservation and heating tank 17; then the second pump 21 pumps the reducing agent that meets the temperature requirements in the reducing agent heat preservation and heating tank 17 into the lower atomization assembly 9 and the upper atomization assembly 11; initially, when no flue gas is introduced, the low-temperature reducing agent in the reducing agent storage tank 16 can be directly pumped into the reducing agent heat preservation and heating tank 17 through the reducing agent serpentine heat exchange tube 6, and the low-temperature reducing agent is heated to an appropriate temperature by the electric heating tubes 18.

[0024] The reducing agent storage tank 16 is also connected to the lower atomization assembly 9 and the upper atomization assembly 11 through a fourth reducing agent pipeline. A fourth pump 23 is arranged on the fourth reducing agent pipeline. The fourth pump 23 is used to directly pump the reducing agent that meets the temperature requirements in the reducing agent storage tank 16 into the lower atomization assembly 9 and the upper atomization assembly 11. At this time, the reducing agent does not need to exchange heat with the flue gas to increase the temperature.

[0025] The lower atomization assembly 9 includes a spiral coil pipe 91. The spiral coil pipe 91 is respectively connected to the third reducing agent pipeline and the fourth reducing agent pipeline. A plurality of atomizing nozzles 92 are uniformly arranged on the lower side wall of the spiral coil pipe 91. The atomizing nozzles 92 are arranged downward and are used for atomizing the reducing agent, so that the reducing agent reacts fully with the flue gas, ensuring the denitrification effect of the flue gas. The upper atomization assembly 11 has the same structure as the lower atomization assembly 9 and is also connected to the third reducing agent pipeline and the fourth reducing agent pipeline in the same way as the lower atomization assembly 9. The lower atomization assembly 9 and the upper atomization assembly 11 form two-layer atomizing denitrification for the flue gas, improving the contact reaction time between the reducing agent and the flue gas, increasing the denitrification efficiency, and further improving the reaction effect between the reducing agent and the flue gas and the denitrification efficiency through the temperature adjustment of the reducing agent.

[0026] The inlet of the heat exchange water snake-shaped heat exchanger 7 is connected to a cold water source through a water diversion pipeline. A third pump 22 is arranged on the water diversion pipeline. The third pump 22 is used to pump cold water into the heat exchange water snake-shaped heat exchanger 7, so as to exchange heat between the cold water and the high-temperature flue gas and recover the heat in the high-temperature flue gas. The outlet of the heat exchange water snake-shaped heat exchanger 7 is connected to a water outlet pipeline, and the water outlet pipeline is connected to an external hot water user, so as to realize the supply of hot water.

[0027] A guiding fan 5 is arranged at the inner bottom of the tower body 1. The guiding fan 5 is located below the flue gas outlet 13. The guiding fan 5 is used to provide upward wind force from the bottom of the tower body 1, so as to guide the flue gas and improve the mixing efficiency of the flue gas and the atomized reducing agent to a certain extent.

[0028] An inlet nitrogen oxide sensor 3 and an inlet temperature sensor 4 are arranged at the inner bottom of the tower body 1. The inlet nitrogen oxide sensor 3 and the inlet temperature sensor 4 are arranged close to the flue gas inlet 2. Among them, the inlet nitrogen oxide sensor 3 is used to detect the nitrogen oxide concentration of the flue gas at the flue gas inlet 2; the inlet temperature sensor 4 is used to detect the flue gas temperature at the flue gas inlet 2. An outlet nitrogen oxide sensor 14 and an outlet temperature sensor 15 are arranged at the inner top of the tower body 1. The outlet nitrogen oxide sensor 14 and the outlet temperature sensor 15 are arranged close to the flue gas outlet 13. Among them, the outlet nitrogen oxide sensor 14 is used to detect the nitrogen oxide concentration of the flue gas at the flue gas outlet 13; the outlet temperature sensor 15 is used to detect the flue gas temperature at the flue gas outlet 13.

[0029] Support legs 26 and a sewage outlet 25 are arranged at the bottom of the tower body 1. Among them, the support legs 26 are used to support the tower body 1; the sewage outlet 25 is used to discharge liquid, dust and other sundries in the tower body 1.

[0030] The device further includes a PLC controller. The input end of the PLC controller is respectively connected to the output ends of the inlet nitrogen oxide sensor 3, the inlet temperature sensor 4, the outlet nitrogen oxide sensor 14, the outlet temperature sensor 15, the first reductant temperature sensor 19 and the second reductant temperature sensor 24. The output end of the PLC controller is respectively connected to the controlled ends of the first pump 20, the second pump 21, the third pump 22, the fourth pump 23, the diversion fan 5 and the electric heating tube 18. The PLC controller is used to realize the automatic control of the device, automatically realize that the temperature of the reductant and the temperature of the flue gas meet the reaction requirements, so as to achieve the best denitration effect and maximize the recovery of the heat of the flue gas.

[0031] When the utility model is in use, by means of the arranged reductant serpentine heat exchange tube 6, the heat exchange water serpentine heat exchanger 7, the reductant storage tank 16 and the reductant heat preservation heating box 17 connected to the reductant serpentine heat exchange tube 6, it is possible to realize adjusting the temperature of the reductant by using the heat of the flue gas and recovering the heat of the flue gas under the condition of ensuring the reaction requirements of the flue gas temperature, so as to achieve the best denitration effect and maximize the recovery of the heat of the flue gas.

Claims

1. A flue gas denitration atomization device, comprising a tower body (1) and a PLC controller; a flue gas inlet (2) is arranged on the bottom side wall of the tower body (1), a flue gas outlet (13) is arranged on the top of the tower body (1), and a lower atomization assembly (9) and an upper atomization assembly (11) are arranged in sequence from bottom to top inside the tower body (1), characterized in that: The inner bottom of the tower body (1) is provided with a reducing agent serpentine heat exchange tube (6) located above the flue gas inlet (2) and a water exchange serpentine heat exchanger (7) arranged alternately with the reducing agent serpentine heat exchange tube (6); The inlet of the reducing agent serpentine heat exchange tube (6) is connected to a reducing agent storage box (16) located outside the tower body (1) through a first reducing agent pipeline, and a first pump (20) for pumping the reducing agent in the reducing agent storage box (16) into the reducing agent serpentine heat exchange tube (6) is provided on the first reducing agent pipeline; the outlet of the reducing agent serpentine heat exchange tube (6) is connected to a reducing agent heat preservation and heating box (17) located outside the tower body (1) through a second reducing agent pipeline, and the outlet of the reducing agent heat preservation and heating box (17) is respectively connected to a lower atomizing assembly (9) and an upper atomizing assembly (11) through a third reducing agent pipeline, and a second pump (21) for pumping the reducing agent in the reducing agent heat preservation and heating box (17) into the lower atomizing assembly (9) and the upper atomizing assembly (11) is provided on the third reducing agent pipeline; The inlet of the water-exchanging serpentine heat exchanger (7) is connected to a cold water source via a water supply pipe, and a third pump (22) is provided on the water supply pipe for pumping cold water into the hot water serpentine heat exchanger (7); the outlet of the water-exchanging serpentine heat exchanger (7) is connected to a water outlet pipe for providing hot water to the outside; The output end of the PLC controller is connected to the controlled ends of the first pump (20), the second pump (21) and the third pump (22) respectively.

2. The flue gas denitration atomization device according to claim 1, characterized in that: The tower body (1) is provided with a guide fan (5) located below the smoke outlet (13) at the bottom thereof and used to provide upward wind force from the bottom of the tower body (1) to guide the smoke. The controlled end of the guide fan (5) is connected to the output end of the PLC controller.

3. The flue gas denitration atomization device according to claim 1, characterized in that: The tower body (1) is provided with a lower catalytic reaction layer (8) located above the reducing agent serpentine heat exchange tube (6) and the water serpentine heat exchanger (7) and below the lower atomization assembly (9), an upper catalytic reaction layer (10) located between the lower atomization assembly (9) and the upper atomization assembly (11), and a demister (12) located above the upper atomization assembly (11).

4. The flue gas denitration atomization device according to claim 1, characterized in that: A first reducing agent temperature sensor (19) for detecting the temperature of the reducing agent is arranged inside the reducing agent storage box (16); the reducing agent storage box (16) is also connected to the lower atomizing assembly (9) and the upper atomizing assembly (11) via a fourth reducing agent pipeline, and a fourth pump (23) for directly pumping the reducing agent in the reducing agent storage box (16) into the lower atomizing assembly (9) and the upper atomizing assembly (11) is arranged on the fourth reducing agent pipeline; the input end of the PLC controller is connected to the output end of the first reducing agent temperature sensor (19), and the output end of the PLC controller is connected to the controlled end of the fourth pump (23).

5. The flue gas denitration atomization device according to claim 4, characterized in that: The lower atomizing assembly (9) comprises a spiral coil (91) connected to the third reducing agent pipeline and the fourth reducing agent pipeline respectively, and a plurality of downwardly disposed atomizing nozzles (92) are evenly arranged on the lower side wall of the spiral coil (91); the upper atomizing assembly (11) has the same structure as the lower atomizing assembly (9) and is connected to the third reducing agent pipeline and the fourth reducing agent pipeline in the same manner as the lower atomizing assembly (9).

6. The flue gas denitration atomization device according to claim 1, characterized in that: An inlet ammonia oxide sensor (3) and an inlet temperature sensor (4) arranged near the flue gas inlet (2) are arranged at the bottom of the tower body (1), and an outlet ammonia oxide sensor (14) and an outlet temperature sensor (15) arranged near the flue gas outlet (13) are arranged at the top of the tower body (1); an input end of the PLC controller is respectively connected to the output ends of the inlet ammonia oxide sensor (3), the inlet temperature sensor (4), the outlet ammonia oxide sensor (14) and the outlet temperature sensor (15).

7. The flue gas denitration atomization device according to claim 1, characterized in that: The reducing agent heat preservation and heating box (17) is a heat preservation box body, a second reducing agent temperature sensor (24) is arranged inside the heat preservation box body, and an electric heating tube (18) for heating the reducing agent is embedded in the inner wall of the heat preservation box body; the input end of the PLC controller is connected to the output end of the second reducing agent temperature sensor (24), and the output end of the PLC controller is connected to the controlled end of the electric heating tube (18).

8. The flue gas denitration atomization device according to claim 1, characterized in that: The bottom of the tower body (1) is provided with supporting legs (26) and a sewage outlet (25).

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