A catalytic reduction purification device for flue gas at the outlet of a power plant

Abstract

The present invention discloses a catalytic reduction purification device for flue gas at the outlet of a power plant, comprising a tank body, characterized in that a porous plate, a partition and a transverse plate are fixedly connected to the inner wall of the tank body in sequence from top to bottom, a plurality of conduits penetrating the partition are evenly distributed on the partition, a column is fixedly connected to the upper end of the porous plate, a spoiler mechanism is provided on the column, a vertical pipe is connected between the chamber above the porous plate and the chamber below the transverse plate, a drain valve for discharging the adsorbent in the tank body and a drive assembly for circulating the flue gas are provided on one side of the tank body, an air inlet pipe and a return pipe are provided on the other side of the tank body, thereby solving the problem that the flue gas after desulfurization contains unreacted sulfur dioxide gas and fly ash particles, which will pollute the air after direct discharge and affect the air environment around the power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a catalytic reduction purification device for flue gas at a power plant outlet. Background Art

[0002] The main ways to reduce sulfur dioxide emissions from thermal power plants are: coal washing, clean coal combustion technology, burning low-sulfur coal and flue gas desulfurization. Coal washing can currently only remove some inorganic sulfur in coal. Clean coal combustion technology is a new technology developed in recent years internationally, but the capacity of each unit is not large, and the technical investment and technical requirements are high, making it difficult to promote and use on a large scale in a short period of time. Flue gas desulfurization technology is relatively mature and is a key and effective means to control sulfur dioxide emissions from thermal power plants. There are four main flue gas desulfurization processes: wet limestone / gypsum absorption method, dry spray drying purification process, in-furnace calcium injection followed by humidification water activation method and circulating fluidized bed flue gas purification process. The circulating fluidized bed flue gas purification process is based on the circulating fluidized bed principle. Through multiple recirculation of the absorbent, the contact time between the absorbent and the flue gas is extended. The circulating fluidized bed flue gas purification process will add Ca(OH)2 powder to the desulfurization tower and SO2 and other components in the flue gas such as SO3, HCl, HF and other acidic gases in the flue gas. The flue gas and the flue gas are fully contacted and mixed. The atomized water sprayed at the inlet of the desulfurization tower reduces the flue gas temperature to ensure the best reaction conditions. On the other hand, a liquid phase is formed on the surface of the Ca(OH)2 particles. The Ca(OH)2 powder, flue gas and the sprayed water in the desulfurization tower are fully mixed in a suspended state and circulated multiple times in the desulfurization tower through excess Ca(OH)2 powder. Under the condition of a suitable Ca / S ratio of 1.3 to 1.6, acidic gases such as SO2 and SO3 in the flue gas can be more fully absorbed, achieving efficient desulfurization and efficient utilization of the desulfurizer. The desulfurization tower is a key component of the circulating fluidized bed flue gas purification process and directly affects the desulfurization efficiency of the entire desulfurization system. In order to ensure sufficient fluidization and suspension of the desulfurizer and fly ash in the desulfurization tower, one or several ash discharge ports are generally set at the bottom of the desulfurization tower to discharge larger ash particles, thereby forming a better flow field, which is conducive to uniform distribution of the flow field in the desulfurization tower, so that the desulfurizer and fly ash particles can be fully mixed with the flue gas in the desulfurization tower.

[0003] At present, since the desulfurization agent and fly ash particles need to be fully mixed with the flue gas inside the desulfurization tower, the discharged flue gas not only contains some unreacted sulfur dioxide gas, but also carries a large amount of fly ash particles and some desulfurization agent. After direct discharge, it will still cause air pollution and affect the air environment around the power plant. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the flue gas after desulfurization contains unreacted sulfur dioxide gas and fly ash particles, which will pollute the air after direct discharge and affect the air environment around the power plant.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A catalytic reduction purification device for flue gas at the outlet of a power plant includes a tank body, characterized in that a porous plate, a partition and a cross plate are fixedly connected to the inner wall of the tank body in sequence from top to bottom, a number of conduits passing through the partition are evenly distributed on the partition, a column is fixedly connected to the upper end of the porous plate, a spoiler mechanism is provided on the column, a vertical pipe is connected between the chamber above the porous plate and the chamber below the cross plate, a drain valve for discharging the adsorbent in the tank body and a drive assembly for circulating the flue gas are provided on one side of the tank body, and an air inlet pipe and a return pipe are provided on the other side of the tank body.

[0007] Compared with the prior art, the present invention provides a catalytic reduction purification device for flue gas at the outlet of a power plant, which has the following beneficial effects:

[0008] 1. The catalytic reduction purification equipment for flue gas at the outlet of the power plant passes through the flue gas desulfurized by the desulfurization tower. When the flue gas enters the tank body from the intake pipe, the flue gas purification adsorbent in the tank body adsorbs part of the particulate flue gas. After the flue gas floats up, it passes through the duct and enters the top of the partition. At this time, the flue gas passes through the porous plate and enters the guide cover. The flue gas passes through the gap between the guide cover and the retaining ring, and under the suction and exhaust action of the blower, it flows back into the tank body through the return pipe and is located under the horizontal plate. At this time, the flue gas below the horizontal plate in the tank body is treated by the flue gas purification adsorbent again and then flows back to the guide cover through the riser. Since the blower only extracts the gas in the tank body for circulation, when the gas discharged from the desulfurization tower enters the tank body, the flue gas in the circulating flow is pressed out from the exhaust pipe and keeps the same exhaust speed as the desulfurization tower, so that the particulate matter and sulfur dioxide in the flue gas can be efficiently circulated and treated.

[0009] 2. The catalytic reduction purification equipment for flue gas at the outlet of the power plant uses a booster pump. When the circulating flue gas flows, the booster pump is started to extract the flue gas purification adsorbent in the tank and discharge it into the annular tube. The flue gas purification adsorbent in the annular tube is sprayed out from the atomizing nozzle and fully contacts the flue gas. Under the action of the guide cover and the retaining ring, the flue gas purification adsorbent is collected on the porous plate and flows back into the tank through the porous plate. At the same time, the motor is started to drive the fixed frame to rotate. When the fixed frame rotates, it drives the horizontal axis to make the bevel gear revolve around the ring gear. During the revolution of the bevel gear, it drives the horizontal axis to rotate the fan blades. When the fan blades rotate, they can fully stir the gas in the tank, which is beneficial for the flue gas purification adsorbent to treat sulfur dioxide gas, and can make the mist-like flue gas purification adsorbent adhere to the inner wall of the tank and flow down.

[0010] Furthermore, the spoiler mechanism includes a fixed frame, the center of one side of the fixed frame is rotatably connected to the side wall of the column through a ball bearing, the left and right sides of the fixed frame are rotatably connected to a horizontal axis through a rolling bearing, and the opposite ends of the two horizontal axes are fixedly connected to fan blades.

[0011] Furthermore, a gear ring is fixedly connected to the side wall of the column, and the gear ring is engaged with two symmetrically arranged bevel gears, and the two bevel gears are fixedly connected to one end of the two horizontal shafts coaxially.

[0012] Furthermore, a motor for driving the fixing frame to rotate is fixedly connected to the upper end of the tank body, and an output end of the motor passes through the side wall of the tank body and is fixedly connected to the center of the upper end of the fixing frame.

[0013] Furthermore, a booster pump is fixedly connected to one side of the tank body, the input end of the booster pump is connected to a liquid inlet pipe, the liquid inlet pipe is fixedly connected to the side wall of the tank body, and the output end of the booster pump is connected to a liquid outlet pipe, which is fixedly connected to the side wall of the tank body.

[0014] Furthermore, one end of the liquid outlet pipe extends into the tank body and is fixedly connected to an annular pipe, and a plurality of evenly distributed atomizing nozzles are fixedly connected to the pipe wall of the annular pipe.

[0015] Furthermore, a retaining ring is fixedly connected to the upper end of the porous plate, a trumpet-shaped air deflector is provided inside the retaining ring, the upper end of the air deflector is fixedly connected to the inner wall of the tank body, and the side wall of the air deflector is fixedly connected to the upper end of the riser through a mounting hole.

[0016] Furthermore, one end of the air inlet pipe and the return pipe both extend into the tank body and are fixedly connected to an aeration head.

[0017] Furthermore, the driving component is a blower, the air outlet end of the blower is fixedly connected to the upper end of the return pipe, and the air inlet end of the blower is provided with a connecting pipe, which is fixedly connected to the side wall of the tank body.

[0018] Furthermore, an exhaust pipe for discharging the purified flue gas is fixedly connected to the front side of the tank body.

[0019] The parts not involved in this device are the same as the existing technology or can be implemented by using the existing technology. The present invention can efficiently circulate and treat the flue gas of the power plant, fully purify the fly ash particles and part of the desulfurizer, and at the same time can also treat the sulfur dioxide gas in the flue gas again, reducing the impact of the fly ash particles and part of the desulfurizer on the environment around the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a catalytic reduction purification device for flue gas at a power plant outlet proposed by the present invention;

[0021] Figure 2 This invention proposes a catalytic reduction purification device for flue gas at the outlet of a power plant Figure 1 sectional view of

[0022] Figure 3 This invention proposes a catalytic reduction purification device for flue gas at the outlet of a power plant Figure 2 Schematic diagram of the structure of the middle spoiler mechanism;

[0023] Figure 4 This is a cross-sectional view of a porous plate, a retaining ring and a guide cover in a catalytic reduction purification device for flue gas at a power plant outlet proposed by the present invention.

[0024] In the figure: 1. Tank body; 2. Air inlet pipe; 3. Return pipe; 4. Blower; 5. Exhaust pipe; 6. Motor; 7. Booster pump; 8. Atomizing nozzle; 9. Annular pipe; 10. Fixing frame; 11. Vertical pipe; 12. Perforated plate; 13. Partition; 14. Horizontal plate; 15. Aeration head; 16. Bevel gear; 17. Fan blade; 18. Column; 19. Gear ring; 20. Retaining ring; 21. Air guide cover; 22. Conduit. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] Reference Figure 1-4, a catalytic reduction purification device for flue gas at the outlet of a power plant, including a tank body 1, the inner wall of the tank body 1 is fixedly connected with a porous plate 12, a partition 13 and a cross plate 14 from top to bottom in sequence, the porous plate 12, the partition 13 and the cross plate 14, the tank body 1 is divided into a plurality of chambers from top to bottom, the plurality of chambers are used to store different flue gas purification adsorbents for treating sulfur dioxide gas, fly ash particles and desulfurizers, this technology has been widely used in life, those skilled in the art are already aware of it, so no more details are given, the side wall of the partition 13 is fixedly connected with a plurality of evenly distributed conduits 22 through through holes, the upper end of the porous plate 12 is fixedly connected with a column 18, a spoiler mechanism is installed on the column 18, the spoiler mechanism includes a fixing frame 10, the center of one side of the fixing frame 10 is rotatably connected to the side wall of the column 18 through a ball bearing, the fixing frame The left and right sides of 10 are rotatably connected with a transverse shaft through a rolling bearing, and the opposite ends of the two transverse shafts are fixedly connected with fan blades 17. The side walls of the columns 18 are fixedly connected with gear rings 19, and the gear rings 19 are engaged with two symmetrically arranged bevel gears 16. The two bevel gears 16 are respectively fixedly connected to one end of the two transverse shafts coaxially. The upper end of the tank body 1 is fixedly connected with a motor 6, and the output end of the motor 6 passes through the side wall of the tank body 1 and is fixedly connected to the center of the upper end of the fixed frame 10. The upper end of the porous plate 12 is fixedly connected with a retaining ring 20, and a horn-shaped air deflector 21 is provided in the retaining ring 20. The upper end of the air deflector 21 is fixedly connected to the inner wall of the tank body 1. The side walls of the porous plate 12, the partition 13 and the transverse plate 14 are all fixedly connected to the riser 11 through circular holes, and the side walls of the air deflector 21 are fixedly connected to the upper end of the riser 11 through mounting holes.

[0028] One side of the tank body 1 is fixedly connected with multiple drain valves, which are used to replace the flue gas purification adsorbents in multiple chambers. The used flue gas purification adsorbents are first discharged, and then new flue gas purification adsorbents are added from the drain valve using the filling equipment. The other side of the tank body 1 is fixedly connected with an air inlet pipe 2 and a return pipe 3. One end of the air inlet pipe 2 and the return pipe 3 extend into the tank body 1 and are fixedly connected with an aeration head 15. One side of the tank body 1 is fixedly connected with a blower 4. The air outlet end of the blower 4 is fixedly connected to the upper end of the return pipe 3. The air inlet end of the machine 4 is fixedly connected to the side wall of the tank body 1 through a connecting pipe, and a booster pump 7 is fixedly connected to one side of the tank body 1. The input end of the booster pump 7 is fixedly connected to the side wall of the tank body 1 through a liquid inlet pipe, and the output end of the booster pump 7 is fixedly connected to the side wall of the tank body 1 through a liquid outlet pipe. One end of the liquid outlet pipe extends into the tank body 1 and is fixedly connected to an annular pipe 9. A plurality of evenly distributed atomizing nozzles 8 are fixedly connected to the pipe wall of the annular pipe 9. The front side of the tank body 1 is fixedly connected to an exhaust pipe 5, and one end of the exhaust pipe 5 is located above the porous plate 12.

[0029] The exhaust duct 21 is connected to the exhaust pipe 22 of the desulfurization tower during use. When the flue gas desulfurized by the desulfurization tower enters the tank body 1 through the exhaust pipe 2, the flue gas purification adsorbent in the tank body 1 absorbs part of the particulate matter flue gas. After the flue gas floats up, it passes through the conduit 22 and enters the top of the partition 13. At this time, the flue gas passes through the porous plate 12 and enters the guide cover 21. The flue gas passes through the gap between the guide cover 21 and the retaining ring 20. Under the suction and exhaust action of the blower 4, it flows back to the tank body 1 through the return pipe 3 and is located below the cross plate 14. At this time, the flue gas below the cross plate 14 in the tank body 1 is treated by the flue gas purification adsorbent again and flows back to the guide cover 21 through the riser 11. Since the blower 4 only extracts the gas in the tank body 1 for circulation, when the gas discharged from the desulfurization tower enters the tank body 1, the flue gas in the circulating flow is pressed out from the exhaust pipe 5 and maintained at the same level as that in the exhaust duct 5. The exhaust speed of the desulfurization tower is consistent, so that the particulate matter and sulfur dioxide in the flue gas can be circulated and treated efficiently. When the circulating flue gas flows, the booster pump 7 is started to extract the flue gas purification adsorbent in the tank body 1 and discharge it into the annular pipe 9. The flue gas purification adsorbent in the annular pipe 9 is sprayed out from the atomizing nozzle 8 and fully contacts the flue gas. Under the action of the guide cover 21 and the retaining ring 20, the flue gas purification adsorbent is collected on the porous plate 12 and flows back to the tank body 1 through the porous plate 12. At the same time, the motor 6 is started to drive the fixed frame 10 to rotate. When the fixed frame 10 rotates, it drives the horizontal axis to make the bevel gear 16 revolve around the ring gear 19, and during the revolution of the bevel gear 16, it drives the horizontal axis to rotate the fan blades 17. When the fan blades 17 rotate, they can fully stir the gas in the tank body 1, which is beneficial for the flue gas purification adsorbent to treat the sulfur dioxide gas, and can make the mist-like flue gas purification adsorbent adhere to the inner wall of the tank body 1 and flow down.

[0030] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A catalytic reduction purification device for flue gas at the outlet of a power plant, comprising a tank body, characterized in that: The inner wall of the tank body is fixedly connected with a porous plate, a partition and a transverse plate in sequence from top to bottom. The partitions are evenly provided with a number of conduits passing through the partitions. The upper end of the porous plate is fixedly connected with a column, and the column is provided with a flow disturbance mechanism. A vertical pipe is connected between the chamber above the porous plate and the chamber below the transverse plate. A drain valve for discharging the adsorbent in the tank body and a drive assembly for circulating the flue gas are provided on one side of the tank body. An air inlet pipe and a return pipe are provided on the other side of the tank body. The air inlet pipe is connected to the side wall of the tank between the partition and the transverse plate, and the return pipe and the drive assembly cooperate to return the smoke above the porous plate to the bottom of the transverse plate.

2. The catalytic reduction purification equipment for flue gas at the power plant outlet according to claim 1, characterized in that: The spoiler mechanism includes a fixing frame, the center of one side of the fixing frame is rotatably connected to the side wall of the column through a ball bearing, the left and right sides of the fixing frame are rotatably connected to a horizontal axis through a rolling bearing, and the opposite ends of the two horizontal axes are fixedly connected to fan blades.

3. The catalytic reduction purification equipment for flue gas at the power plant outlet according to claim 2, characterized in that: A gear ring is fixedly connected to the side wall of the column, and the gear ring is engaged with two symmetrically arranged bevel gears. The two bevel gears are respectively fixedly connected to one end of the two transverse shafts coaxially.

4. The catalytic reduction purification equipment for flue gas at the outlet of a power plant according to claim 3, characterized in that: The upper end of the tank body is fixedly connected to a motor for driving the fixing frame to rotate, and the output end of the motor passes through the side wall of the tank body and is fixedly connected to the center of the upper end of the fixing frame.

5. The catalytic reduction purification equipment for flue gas at the outlet of a power plant according to claim 1, characterized in that: A booster pump is fixedly connected to one side of the tank body, the input end of the booster pump is connected to a liquid inlet pipe, the liquid inlet pipe is fixedly connected to the side wall of the tank body, and the output end of the booster pump is connected to a liquid outlet pipe, which is fixedly connected to the side wall of the tank body.

6. The catalytic reduction purification equipment for flue gas at the power plant outlet according to claim 5, characterized in that: One end of the liquid outlet pipe extends into the tank body and is fixedly connected to an annular pipe. A plurality of evenly distributed atomizing nozzles are fixedly connected to the pipe wall of the annular pipe.

7. The catalytic reduction purification equipment for flue gas at the outlet of a power plant according to claim 1, characterized in that: The upper end of the porous plate is fixedly connected with a retaining ring, and a trumpet-shaped air deflector is provided in the retaining ring. The upper end of the air deflector is fixedly connected to the inner wall of the tank body, and the side wall of the air deflector is fixedly connected to the upper end of the riser through a mounting hole.

8. The catalytic reduction purification equipment for flue gas at the power plant outlet according to claim 7, characterized in that: One end of the air inlet pipe and the return pipe both extend into the tank body and are fixedly connected with an aeration head.

9. The catalytic reduction purification equipment for flue gas at the outlet of a power plant according to claim 7, characterized in that: The driving component is a blower, the air outlet end of the blower is fixedly connected to the upper end of the return pipe, and the air inlet end of the blower is provided with a connecting pipe, which is fixedly connected to the side wall of the tank body.

10. The catalytic reduction purification equipment for flue gas at a power plant outlet according to any one of claims 1 to 9, characterized in that: An exhaust pipe for discharging the purified flue gas is fixedly connected to the front side of the tank body.

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