Waste gas wet-process deacidification system

Abstract

The utility model belongs to the technical field of solid waste treatment, and particularly discloses a waste gas wet-process deacidification system which comprises a deacidification tower and an alkaline washing tower, a gas inlet end flange of the deacidification tower is connected with a gas inlet pipe, the flange of the gas inlet pipe is fixedly connected with a first pre-cooling spray gun, and a plurality of second pre-cooling spray guns are arranged on vertical sections of cylinder bodies of the deacidification tower and the alkaline washing tower. The exhaust end of the deacidification tower is connected with the gas inlet end of the alkaline washing tower through a pipeline, three sections of filler layers are arranged in the alkaline washing tower, and the exhaust end of the alkaline washing tower is connected with an exhaust pipe through a flange. The problems that in an existing wet deacidification system, the temperature in a conical section at the top of a deacidification tower cannot be reduced, and consequently the service life of the deacidification tower is greatly shortened are solved. According to the utility model, the first precooling spray gun is arranged at the flange of the gas inlet pipe, and high-temperature flue gas entering the deacidification tower from the bag-type dust collector is instantly sprayed and cooled, so that the internal temperature of the conical section at the top of the tower is effectively controlled, and the service life of the deacidification tower is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste treatment, in particular to a waste gas wet deacidification system. Background Art

[0002] In industrial waste treatment, the sodium alkali method is the most commonly used wet deacidification method. The wet process has a good effect on the removal of flue gas pollutants. The flue gas after the furnace enters the wet deacidification tower after dust removal. The flue gas reacts with the alkali solution for a primary deacidification to remove flue gas pollutants, and then undergoes a secondary deacidification in the alkali washing tower. The purified flue gas is discharged from the chimney through the induced draft fan. Actual operating experience has proved that the wet process has a high removal efficiency for acidic pollutants and can adapt to the operating requirements of various working conditions.

[0003] The deacidification tower is made of FRP, and the upper temperature limit of FRP is 80℃, while the flue gas temperature entering the deacidification tower from the bag filter is 145℃. Four precooling spray guns are installed on the vertical section of the deacidification tower cylinder. The precooling spray gun sprays liquid to cool and deacidify the flue gas. The spray liquid in the precooling spray gun is a mixture of alkali solution and water, and the alkali water is provided by the quenching water tank and the caustic soda storage tank.

[0004] However, during the deacidification process, the pre-cooling spray gun installed on the vertical section of the deacidification tower cylinder only cools down the vertical section of the cylinder, but cannot cool down the temperature inside the conical section at the top of the deacidification tower. The conical section at the top of the deacidification tower is in a high temperature state. The high temperature causes thermal decomposition of the fiberglass and causes it to crack, resulting in a significant reduction in the service life of the deacidification tower. Utility Model Content

[0005] The utility model aims to provide a waste gas wet deacidification system to solve the problem that in the existing wet deacidification system, the temperature inside the conical section at the top of the deacidification tower cannot be cooled, resulting in a significant reduction in the service life of the deacidification tower.

[0006] To achieve the above-mentioned purpose, the basic scheme provided by the utility model is: a waste gas wet deacidification system, comprising a deacidification tower and an alkali washing tower, the air inlet end flange of the deacidification tower is connected to an air inlet pipe, a first precooling spray gun is fixedly connected to the air inlet pipe flange, a plurality of second precooling spray guns are provided on the vertical sections of the cylinders of the deacidification tower and the alkali washing tower, the first precooling spray gun and the second precooling spray gun are connected to the alkaline water structure, the exhaust end of the deacidification tower is connected to the air inlet end pipeline of the alkali washing tower, three sections of packing layers are provided in the alkali washing tower, the exhaust end flange of the alkali washing tower is connected to an exhaust pipe, a draft fan is connected to the exhaust pipe, and the end of the exhaust pipe away from the alkali washing tower is connected to the chimney.

[0007] The working principle of the utility model is as follows: first, the induced draft fan is started. When the flue gas enters the deacidification tower through the air inlet pipe, the two first pre-cooling spray guns at the flange of the air inlet pipe perform the first cooling and deacidification on the incoming flue gas. The flue gas after the first cooling and deacidification moves downward. When the flue gas reaches the vertical section of the deacidification tower barrel, a plurality of second pre-cooling spray guns perform the second cooling and deacidification on the flue gas. At this time, the flue gas is cooled to 80°C. Then, the flue gas after the second cooling and deacidification enters the alkali washing tower through the pipeline. The flue gas moves from bottom to top. When passing through three layers of fillers, the acidic gas in the flue gas is adsorbed on each layer of fillers. Then, a plurality of second pre-cooling spray guns on the vertical section of the alkali washing tower barrel perform alkali washing on the acidic gas adsorbed on the three layers of fillers and the acidic gas in the flue gas, producing an acid-base neutralization reaction. Finally, the purified flue gas is discharged into the atmosphere through the chimney under the action of the induced draft fan.

[0008] The beneficial effects of the utility model are as follows: a first precooling spray gun is arranged at the flange of the air inlet pipe, and the high-temperature flue gas entering the deacidification tower from the bag filter is instantly sprayed and cooled, so that the internal temperature of the conical section at the top of the tower is effectively controlled, thereby increasing the service life of the deacidification tower; and the alkaline water in the first precooling spray gun deacidifies the flue gas, thereby improving the deacidification efficiency in the flue gas.

[0009] Option 2, which is a preferred option of the basic option, the alkaline water structure includes two annular conveying pipes, each of which is fixedly connected to the outer wall of the deacidification tower and the alkali washing tower, the first precooling spray gun and the second precooling spray gun are both connected to the annular conveying pipes, and the annular conveying pipes are both connected to the quenching water tank and the caustic soda storage tank, and a conveying pump is provided on the annular conveying pipes.

[0010] Option 3 is the preferred option of the basic option. The three packing layers are all ball rings. The three-layer packing is ball rings to facilitate the separation of acidic gases.

[0011] Option 4 is a preferred option of the basic option. The heights of the three packing layers are 150 cm, 100 cm, and 6 cm respectively.

[0012] Option 5, which is the preferred option of the basic option, is that a grille plate is fixedly connected in the deacidification tower; the grille plate is provided in the deacidification tower to facilitate airflow distribution.

[0013] Option six, which is the preferred option of the basic option, is that a flue gas heater is connected to the exhaust pipe; the arrangement of a flue gas heater on the exhaust pipe can prevent low-temperature saturated flue gas from causing corrosion in the induced draft fan and the chimney. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of a waste gas wet deacidification system of the utility model;

[0015] Figure 2It is a stereoscopic diagram of a deacidification tower and an alkali washing tower in a waste gas wet deacidification system of the utility model;

[0016] Figure 3 It is a cross-sectional view of a deacidification tower in a waste gas wet deacidification system of the utility model;

[0017] Figure 4 It is a cross-sectional view of an alkali washing tower in a waste gas wet deacidification system of the utility model. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below through specific implementation methods:

[0019] The figure marks in the drawings of the specification include: 1. deacidification tower; 11. air inlet pipe; 12. first precooling spray gun; 13. grille plate; 2. alkali washing tower; 21. ball ring; 22. exhaust pipe; 3. second precooling spray gun; 4. annular conveying pipe; 41. conveying pump; 5. quenching water tank; 6. caustic soda storage tank; 7. induced draft fan; 8. chimney; 9. flue gas heater.

[0020] like Figures 1 to 4 As shown: a waste gas wet deacidification system, including a deacidification tower 1 and an alkali washing tower 2, the air inlet end flange of the deacidification tower 1 is connected to an air inlet pipe 11, and a first precooling spray gun 12 is fixedly connected to the flange of the air inlet pipe 11, and the vertical sections of the cylinders of the deacidification tower 1 and the alkali washing tower 2 are fixedly connected to a plurality of second precooling spray guns 3, and the first precooling spray gun 12 and the second precooling spray gun 3 are connected to an alkali water structure, and the alkali water structure includes two annular conveying pipes 4, each of which is fixedly connected to the outer wall of the deacidification tower 1 and the alkali washing tower 2, and the first precooling spray gun 12 and the second precooling spray gun 3 are connected to the annular conveying pipe 4, and the annular conveying pipe 4 They are all connected with the quenching water tank 5 and the caustic soda storage tank 6, a delivery pump 41 is fixedly connected to the annular delivery pipe 4, a grille plate 13 is fixedly connected in the deacidification tower 1, the exhaust end of the deacidification tower 1 is connected to the air inlet end pipeline of the alkali washing tower 2, three sections of packing layers are fixedly connected in the alkali washing tower 2, the three sections of packing layers are all ball rings 21, and the heights of the three sections of packing layers are 150 cm, 100 cm, and 6 cm respectively, the exhaust end flange of the alkali washing tower 2 is connected with an exhaust pipe 22, a draft fan 7 is fixedly connected to the exhaust pipe 22, a flue gas heater 9 is connected to the exhaust pipe 22, and the end of the exhaust pipe 22 away from the alkali washing tower 2 is connected to the chimney 8.

[0021] The implementation method of this embodiment is as follows: first, the delivery pump 41 and the induced draft fan 7 are started. When the flue gas enters the deacidification tower 1 through the air inlet pipe 11, the two first precooling spray guns 12 at the flange of the air inlet pipe 11 perform the first cooling and deacidification on the incoming flue gas. The flue gas after the first cooling and deacidification moves downward. When the flue gas reaches the vertical section of the barrel of the deacidification tower 1, a plurality of second precooling spray guns 3 perform the second cooling and deacidification on the flue gas. At this time, the flue gas is cooled to 80°C. Then, the flue gas after the second cooling and deacidification enters the alkali washing tower 2 through the pipeline. The flue gas moves from bottom to top and passes through three sections of ball rings 21. The acidic gas in the flue gas is adsorbed on each section of the ball rings 21. Then, a number of second pre-cooling spray guns 3 on the vertical section of the cylinder of the alkali washing tower 2 perform alkali washing on the acidic gas adsorbed on the ball rings 21 and the acidic gas in the flue gas to produce an acid-base neutralization reaction. Then, the purified flue gas enters the flue gas heater 9 through the exhaust pipe 21 at the top of the alkali washing tower 2. The flue gas heater 9 heats the flue gas to 110°C. Finally, under the action of the induced draft fan 7, the flue gas is discharged into the atmosphere through the chimney 8.

[0022] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A waste gas wet deacidification system, It is characterized in that The invention comprises a deacidification tower (1) and an alkali washing tower (2), wherein the air inlet end flange of the deacidification tower (1) is connected to an air inlet pipe (11), and a first precooling spray gun (12) is fixedly connected to the flange of the air inlet pipe (11), and a plurality of second precooling spray guns (3) are provided on the vertical sections of the cylinders of the deacidification tower (1) and the alkali washing tower (2), and the first precooling spray gun (12) and the second precooling spray gun (3) are connected to an alkali water structure, and the exhaust end of the deacidification tower (1) is connected to the air inlet end pipeline of the alkali washing tower (2), and three sections of packing layers are provided in the alkali washing tower (2), and the exhaust end flange of the alkali washing tower (2) is connected to an exhaust pipe (22), and an induced draft fan (7) is connected to the exhaust pipe (22), and the end of the exhaust pipe (22) away from the alkali washing tower (2) is connected to a chimney (8).

2. A waste gas wet deacidification system according to claim 1, It is characterized in that The alkaline water structure comprises two annular conveying pipes (4), each of the annular conveying pipes (4) being fixedly connected to the outer wall of the deacidification tower (1) and the alkali washing tower (2), respectively; the first precooling spray gun (12) and the second precooling spray gun (3) are both connected to the annular conveying pipes (4), the annular conveying pipes (4) are both connected to the quenching water tank (5) and the caustic soda storage tank (6), and a conveying pump (41) is provided on the annular conveying pipes (4).

3. A waste gas wet deacidification system according to claim 1, It is characterized in that The three packing layers are all ball rings (21).

4. A waste gas wet deacidification system according to claim 1, It is characterized in that The heights of the three packing layers are 150 cm, 100 cm and 6 cm respectively.

5. A waste gas wet deacidification system according to claim 1, It is characterized in that A grid plate (13) is fixedly connected inside the deacidification tower (1).

6. A waste gas wet deacidification system according to claim 1, It is characterized in that The exhaust pipe (22) is connected to a flue gas heater (9).

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