A low-temperature denitrification method for flue gas in thermal power plants

Abstract

The present invention provides a method for low-temperature denitrification of flue gas from a thermal power plant, which relates to the field of low-temperature flue gas denitrification. The method comprises: a supercharger, an ozone pipe, and a first absorption plate. The supercharger is located at the upper end of a denitrification tower and is connected to the interior of the denitrification tower via a supercharged pipe. The ozone pipe is located on the right side of the denitrification tower. A fixed plate frame is connected to one end of the ozone pipe. An exhaust fan is fixed within the cavity of the fixed plate frame. The first absorption plate is located inside the denitrification tower, and a second absorption plate is fixed to the lower end of the first absorption plate. The present invention solves the problem in the prior art that after the ozone and flue gas mix and react in the denitrification tower, the gas floats upward, resulting in a large amount of gas being placed in the upper end of the denitrification tower, making it difficult for the flue gas to come into contact with the calcium carbonate solution.

Description

Technical Field

[0001] The present invention relates to the field of low-temperature denitration of flue gas, and in particular to a low-temperature denitration method for flue gas in a thermal power plant. Background Art

[0002] With the continuous development of society, people are paying more and more attention to environmental pollution. Among them, the pollution of electronic cigarette gas from coal-fired power plants is one of the important factors for the excessive PM2.5 in my country's atmospheric environment and the frequent occurrence of smog weather. Therefore, the treatment of electronic cigarette gas from coal-fired power plants is an important step in reducing environmental pollution. After searching, the existing technology (application number: 202120804945.4) records that "the flue gas and ozone are respectively introduced into the denitrification tower body 1 from the flue gas inlet pipe 19 and the ozone pipe 20 in a specific proportion, the liquid extraction pipe on the pump body 2 is connected to the calcium carbonate solution, the pump body 2 and the drive motor 12 are started, and the pump body 2 draws the calcium carbonate solution in and sprays it out through the spray head 7". However, in the prior art, after the ozone and flue gas in the denitrification tower mix and react, the gas floats up, resulting in a large amount of gas being placed in the upper end of the denitrification tower, making it inconvenient for the flue gas to better contact with the calcium carbonate solution. Summary of the Invention

[0003] In order to overcome the defects of the existing technology, a low-temperature denitrification method for flue gas in a thermal power plant is now provided to solve the problem that after the ozone and flue gas mix and react in the denitrification tower in the existing technology, the gas floats up, resulting in a large amount of gas being placed in the upper end of the denitrification tower, making it difficult for the flue gas to better contact with the calcium carbonate solution.

[0004] In order to achieve the above-mentioned purpose, a low-temperature denitrification method for flue gas in a thermal power plant is provided, comprising: discharging flue gas from an air inlet pipe (13) into a denitrification tower (1), turning on an exhaust fan (32), discharging ozone transported in an ozone pipe (3) into the denitrification tower (1), causing the ozone to react and mix with the flue gas, and at the same time, the downward wind direction of the exhaust fan (32) prevents the flue gas from flowing upward, and the flue gas that floats up during the spraying process is caused to sink through a booster (2), and at the same time, the exhaust fan (32) draws the upper flue gas downward, so that the flue gas can fully contact with the calcium carbonate solution, so that the flue gas can better contact with the calcium carbonate solution, and then pass through the first absorption plate (5) The second absorption plate (51) further absorbs and oxidizes the flue gas, thereby improving the effect of low-temperature denitration of the flue gas, and finally discharges the denitrified flue gas from the exhaust pipe (11); the booster (2) is located at the upper end of the denitrification tower (1), and the booster (2) is connected to the inside of the denitrification tower (1) through the booster pipe (21); the ozone pipe (3) is located on the right side of the denitrification tower (1), and one end of the ozone pipe (3) is connected to a fixed plate frame (31), and an exhaust fan (32) is fixed in the cavity of the fixed plate frame (31); the first absorption plate (5) is located inside the denitrification tower (1), and the second absorption plate (51) is fixed at the lower end of the first absorption plate (5).

[0005] The method for low-temperature denitration of flue gas from a thermal power plant is described. The upper end of the denitration tower (1) is connected to an exhaust pipe (11), a first electric valve (12) is installed on the surface of the exhaust pipe (11), and the left end of the denitration tower (1) is connected to an air intake pipe (13), a second electric valve (14) is installed on the surface of the air intake pipe (13).

[0006] The method for low-temperature denitration of flue gas from a thermal power plant is described. The inner wall of the upper end of the denitration tower (1) is provided with an exhaust port (17); the exhaust port (17) is connected to a pressurizing pipe (21); a drain pipe (15) is fixed to the lower end of the denitration tower (1), and a control valve (16) is installed on the surface of the drain pipe (15).

[0007] A method for low-temperature denitration of flue gas from a thermal power plant is described, wherein a control box (4) is screwed onto the front surface of the denitration tower (1), the exhaust fan (32) is fixed to the inner wall of the denitration tower (1) via a fixed plate frame (31), and a branch short pipe is connected to a portion of the ozone pipe (3); and the branch short pipe is located at the lower end of the second absorption plate (51).

[0008] In the low-temperature denitration method for flue gas in a thermal power plant, an annular filter frame (52) and a circular filter frame (53) are provided inside the first absorption plate (5) and the second absorption plate (51); and a hollow groove is formed between the annular filter frame (52) and the circular filter frame (53).

[0009] In the method for low-temperature denitrification of flue gas in a thermal power plant, a connecting plate (62) is fixed to the lower end of the fixed plate frame (31), six groups of spray heads (6) are distributed on the lower end surface of the connecting plate (62), and the upper ends of the spray heads (6) are connected to liquid infusion pipes (61).

[0010] In the method for low-temperature denitration of flue gas from a thermal power plant, the ozone pipe (3), the spray head (6), the second absorption plate (51) and the first absorption plate (5) constitute a three-layer low-temperature denitration structure for flue gas from a thermal power plant; and the second absorption plate (51) and the first absorption plate (5) are filled with a catalyst. Beneficial effects

[0011] The low-temperature denitrification method for flue gas from a thermal power plant of the present invention utilizes an exhaust fan to discharge ozone transported in an ozone pipe into a denitrification tower, so that the ozone reacts and mixes with the flue gas. At the same time, the downward wind direction of the exhaust fan prevents the flue gas from flowing upward, and the flue gas floating up during the spraying process is caused to sink by a supercharger. At the same time, the exhaust fan draws the upper flue gas downward, so that the flue gas can fully contact with the calcium carbonate solution, thereby facilitating better contact between the flue gas and the calcium carbonate solution. The flue gas is further absorbed and oxidized by the first absorption plate and the second absorption plate, thereby facilitating improved effect of low-temperature denitrification of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view structural schematic diagram of a low-temperature denitrification method for flue gas in a thermal power plant according to an embodiment of the present invention.

[0013] Figure 2 It is a front cross-sectional structural schematic diagram of a low-temperature denitrification method for flue gas in a thermal power plant according to an embodiment of the present invention.

[0014] Figure 3 Schematic diagram of the top structure of the first absorption plate according to an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the installation structure of a spray head according to an embodiment of the present invention. The figure shows: 1. Denitrification tower; 11. Exhaust pipe; 12. First electric valve; 13. Inlet pipe; 14. Second electric valve; 15. Liquid discharge pipe; 16. Control valve; 17. Exhaust vent; 2. Booster; 21. Booster pipe; 3. Ozone pipe; 31. Fixed plate; 32. Exhaust fan; 4. Control box; 5. First absorption plate; 51. Second absorption plate; 52. Ring filter frame; 53. Circular filter frame; 6. Spray head; 61. Liquid infusion pipe; 62. Connecting plate. DETAILED DESCRIPTION

[0016] Reference Figures 1 to 4 As shown, the present invention provides a low-temperature denitrification method for flue gas in a thermal power plant, comprising: a booster 2, an ozone pipe 3 and a first absorption plate 5.

[0017] The booster 2 is located at the upper end of the denitrification tower 1. The booster 2 is connected to the inside of the denitrification tower 1 through the booster pipe 21. The ozone pipe 3 is located on the right side of the denitrification tower 1. One end of the ozone pipe 3 is connected to a fixed plate frame 31. An exhaust fan 32 is fixed in the cavity of the fixed plate frame 31. The first absorption plate 5 is located inside the denitrification tower 1. The second absorption plate 51 is fixed to the lower end of the first absorption plate 5.

[0018] When using the low-temperature denitrification method for flue gas from a thermal power plant, the flue gas is discharged from the air inlet pipe 13 into the denitrification tower 1, the exhaust fan 32 is turned on, and the ozone transported in the ozone pipe 3 is discharged into the denitrification tower 1, so that the ozone and the flue gas react and mix. At the same time, the downward wind direction of the exhaust fan 32 prevents the flue gas from flowing upward, and the flue gas floating up during the spraying process is sunk by the supercharger 2. At the same time, the exhaust fan 32 draws the upper flue gas downward so that the flue gas can fully contact with the calcium carbonate solution, which facilitates better contact between the flue gas and the calcium carbonate solution. The flue gas is then further absorbed and oxidized by the first absorption plate 5 and the second absorption plate 51, so as to improve the effect of low-temperature denitrification of the flue gas. Finally, the flue gas after denitrification is discharged from the exhaust pipe 11.

[0019] In this embodiment, the upper end of the denitrification tower 1 is connected to an exhaust pipe 11, on the surface of which a first electric valve is installed; the left end of the denitrification tower 1 is connected to an air intake pipe 13, on the surface of which a second electric valve 14 is installed.

[0020] [As a preferred embodiment, the first electric valve 12 is opened to allow the flue gas after denitration to be discharged from the exhaust pipe 11. The second electric valve 14 is opened to allow the flue gas to enter the denitration tower 1 through the air inlet pipe 13 to perform the denitration reaction.

[0021] In this embodiment, an exhaust port 17 is provided on the inner wall of the upper end of the denitrification tower 1 ; and the exhaust port 17 is connected to the boost pipe 21 , a drain pipe 15 is fixed to the lower end of the denitrification tower 1 , and a control valve 16 is installed on the surface of the drain pipe 15 .

[0022] As a preferred embodiment, the boost pipe 21 discharges the air from the booster 2 from the exhaust port 17, causing the rising flue gas to sink, thereby facilitating full contact between the flue gas and the sprayed calcium carbonate solution. The drain pipe 15 is used to discharge the solution after the reaction.

[0023] In this embodiment, a control box 4 is screwed to the front end surface of the denitrification tower 1, the exhaust fan 32 is fixed to the inner wall of the denitrification tower 1 through a fixed plate frame 31, and a branch short pipe is connected to part of the ozone pipe 3; and the branch short pipe is located at the lower end of the second absorption plate 51.

[0024] As a preferred embodiment, control box 4 is used to control the valve opening and closing during the stock removal process and the activation of booster 2 and exhaust fan 32. When spraying, ozone pipe 3 is closed to allow ozone to flow in, and the solenoid valve on the branch short pipe is opened, allowing exhaust fan 32 to draw the rising smoke downward.

[0025] In this embodiment, an annular filter frame 52 and a circular filter frame 53 are provided inside the first absorption plate 5 and the second absorption plate 51 ; and a hollow groove is formed between the annular filter frame 52 and the circular filter frame 53 .

[0026] As a preferred embodiment, the annular filter frame 52 and the circular filter frame 53 are respectively filled with activated carbon and a catalyst used for oxidation reaction, so as to facilitate further absorption and oxidation of flue gas and improve the effect of low-temperature denitrification of flue gas.

[0027] In this embodiment, a connecting plate 62 is fixed to the lower end of the fixed plate frame 31 , six groups of spray heads 6 are distributed on the lower end surface of the connecting plate 62 , and the upper ends of the spray heads 6 are connected to the liquid delivery tubes 61 .

[0028] As a preferred embodiment, six groups of spray heads 6 spray out the calcium carbonate solution transported in the infusion pipe 61, so that the calcium carbonate solution reacts with the flue gas. At this time, the booster 2 and the exhaust fan 32 are started to prevent the flue gas from floating up.

[0029] In this embodiment, the ozone pipe 3, the spray head 6, the second absorption plate 51 and the first absorption plate 5 constitute a three-layer low-temperature denitrification structure for flue gas in a thermal power plant; and the second absorption plate 51 and the first absorption plate 5 are filled with catalysts.

[0030] As a preferred implementation method, the three-layer low-temperature denitrification structure of the flue gas in a thermal power plant makes the low-temperature denitrification reaction of the flue gas more complete, thereby improving the denitrification effect of the low-temperature denitrification method.

[0031] The low-temperature denitration method for flue gas from a thermal power plant of the present invention can effectively solve the problem that flue gas is not easily in contact with a calcium carbonate solution, facilitates better contact between flue gas and the calcium carbonate solution, improves the effect of low-temperature denitration of flue gas, and is suitable for a low-temperature denitration method for flue gas from a thermal power plant.

Claims

1. A method for low-temperature denitrification of flue gas from a thermal power plant, characterized by: The flue gas is discharged from the air inlet pipe (13) into the denitrification tower (1), the exhaust fan (32) is turned on, and the ozone transported in the ozone pipe (3) is discharged into the denitrification tower (1), so that the ozone reacts and mixes with the flue gas. At the same time, the downward wind direction of the exhaust fan (32) prevents the flue gas from flowing upward, and the flue gas floating up during the spraying process is sunk by the supercharger (2). At the same time, the exhaust fan (32) pumps the upper flue gas downward so that the flue gas can fully contact with the calcium carbonate solution, so that the flue gas can better contact with the calcium carbonate solution. The flue gas is further absorbed and oxidized by the first absorption plate (5) and the second absorption plate (51), so as to improve the effect of low-temperature denitrification of the flue gas. Finally, the flue gas that has completed denitrification is discharged from the exhaust pipe (11); the supercharger (2) is located in the denitrification tower (1). At the upper end, the booster (2) is connected to the interior of the denitrification tower (1) through a booster pipe (21); the ozone pipe (3) is located on the right side of the denitrification tower (1); one end of the ozone pipe (3) is connected to a fixed plate frame (31); an exhaust fan (32) is fixed in the cavity of the fixed plate frame (31); the first absorption plate (5) is located inside the denitrification tower (1); a second absorption plate (51) is fixed at the lower end of the first absorption plate (5); the upper end of the denitrification tower (1) is connected to an exhaust pipe (11); a first electric valve (12) is installed on the surface of the exhaust pipe (11); the left end of the denitrification tower (1) is connected to an air intake pipe (13); a second electric valve (14) is installed on the surface of the air intake pipe (13); An exhaust port (17) is provided on the inner wall of the upper end of the denitrification tower (1); and the exhaust port (17) is connected to the boosting pipe (21); a drain pipe (15) is fixed to the lower end of the denitrification tower (1), and a control valve (16) is installed on the surface of the drain pipe (15); a control box (4) is screwed to the front surface of the denitrification tower (1); the exhaust fan (32) is fixed to the inner wall of the denitrification tower (1) through a fixing plate frame (31); a branch short pipe is connected to the middle part of the ozone pipe (3); and the branch short pipe is located at the lower end of the second absorption plate (51).

2. The method for low-temperature denitrification of flue gas from a thermal power plant according to claim 1, characterized in that: An annular filter frame (52) and a circular filter frame (53) are provided inside the first absorption plate (5) and the second absorption plate (51); and a hollow groove is formed between the annular filter frame (52) and the circular filter frame (53).

3. A method for low-temperature denitrification of flue gas from a thermal power plant according to claim 2, characterized in that: A connecting plate (62) is fixed to the lower end of the fixed plate frame (31), and six groups of spray heads (6) are distributed on the lower end surface of the connecting plate (62). The upper ends of the spray heads (6) are connected to the infusion tubes (61).

4. The method for low-temperature denitrification of flue gas from a thermal power plant according to claim 3, characterized in that: The ozone pipe (3), the spray head (6), the second absorption plate (51) and the first absorption plate (5) constitute a three-layer low-temperature denitrification structure for flue gas in a thermal power plant; and the second absorption plate (51) and the first absorption plate (5) are filled with catalysts.

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