Device for improving dimethyl sulfoxide tail gas absorption efficiency

Abstract

The utility model discloses a device for improving dimethyl sulfoxide tail gas absorption efficiency, which adopts the technical scheme that the device comprises a washing buffer tank, a washing liquid inlet pipe is arranged at the upper half part of the washing buffer tank, a second pneumatic valve is arranged on the washing liquid inlet pipe, a flue gas inlet pipe is arranged at the lower half part of the washing buffer tank, and one end of a circulating pipeline is arranged at the bottom; the other end of the circulating pipeline is connected to the upper half part of the washing buffer tank, a filter, a circulating pump and a condenser are sequentially arranged on the circulating pipeline, and a flue gas discharge pipe is arranged at the top of the washing buffer tank and is connected to an absorption section. The device disclosed by the utility model has the beneficial effects that (1) solid particles in flue gas are effectively removed through the pretreatment facility, so that blockage and corrosion to the interior of the absorption tower are reduced; and (2) the device monitors the indexes of the washing liquid through the liquid level meter and the pH sensor together, so that the automation degree is high, and the working efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of dimethyl sulfoxide production, in particular to a device for improving the absorption efficiency of dimethyl sulfoxide tail gas. Background Art

[0002] The production of dimethyl sulfoxide (DMSO) generates waste gas containing a variety of sulfur-containing organic compounds at multiple stages, from the sulfur melting room to raw material preparation, synthesis, and distillation. This waste gas has a complex composition, including not only large amounts of carbon dioxide, sulfur dioxide, and water vapor, but also potentially small amounts of nitrogen oxides, sulfur trioxide, sulfur particles, and carbon black particles. Sulfur dioxide is one of the primary pollutants in waste gas and must be effectively removed by an absorber to ensure emissions meet environmental standards. However, sulfur and carbon black particles carried in the waste gas can adversely affect absorber operation, potentially causing pipe blockages, reducing absorption efficiency, and even forcing equipment downtime for maintenance. Sulfur trioxide and nitrogen oxides, when combined with water vapor, form highly acidic solutions such as sulfuric acid and nitric acid. These acidic solutions are highly corrosive to the absorber and its associated equipment, leading to long-term equipment damage, increased maintenance costs, and potentially shortening equipment life. Sulfur and carbon black particles not only clog pipes but also deposit inside the absorber, forming a difficult-to-remove scale layer, further reducing its efficiency. In addition, these sediments may become new sources of pollution and re-enter the atmosphere with emissions. Utility Model Content

[0003] In response to the problems in the above-mentioned prior art, the utility model provides a device for improving the absorption efficiency of dimethyl sulfoxide tail gas, and its technical solution is: it includes a water washing buffer tank, a washing liquid inlet pipe is provided in the upper half of the water washing buffer tank, a second pneumatic valve is provided on the washing liquid inlet pipe, a flue gas inlet pipe is provided in the lower half, one end of a circulation pipe is provided at the bottom, the other end of the circulation pipe is connected to the upper half of the water washing buffer tank, a filter, a circulation pump and a condenser are provided on the circulation pipe in sequence, a flue gas exhaust pipe is provided on the top of the water washing buffer tank, and the flue gas exhaust pipe is connected to the absorption section.

[0004] As a preferred solution, a drainage pipe is connected in parallel to one end of the circulation pipe close to the bottom of the water washing buffer tank, a first pneumatic valve is provided on the drainage pipe, and the drainage pipe is connected to the sodium sulfite section.

[0005] As a preferred solution, a liquid level gauge is provided on the top of the water washing buffer tank, and the liquid level gauge is interlocked with the first pneumatic valve and the second pneumatic valve.

[0006] As a preferred solution, a pH sensor is provided on the side wall of the water washing buffer tank, and the pH sensor is interlocked with the first pneumatic valve.

[0007] As a preferred solution, a temperature sensor is provided on the top of the water washing buffer tank.

[0008] As a preferred solution, the circulation pipeline is connected to the tube layer of the condenser, and a circulating water inlet and a circulating water outlet are provided on the shell side.

[0009] As a preferred solution, the circulation pipe is connected to the upper inner end of the water washing buffer tank and is provided with a plurality of spray heads.

[0010] Beneficial effects of the utility model:

[0011] (1) The device effectively removes solid particles from flue gas through pretreatment facilities, reducing blockage and corrosion inside the absorption tower;

[0012] (2) The device monitors the washing liquid indicators through a liquid level meter and a pH sensor, with a high degree of automation and high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] In the figure: 1. Water washing buffer tank; 101. Liquid level meter; 102. pH sensor; 103. Temperature sensor; 2. Washing liquid inlet pipe; 3. Flue gas inlet pipe; 4. Circulation pipe; 401. Sprinkler head; 5. Filter; 6. Circulation pump; 7. Condenser; 701. Circulating water inlet; 702. Circulating water outlet; 8. Drain pipe; 9. First pneumatic valve; 10. Sodium sulfite section; 11. Flue gas exhaust pipe; 12. Absorption section; 13. Second pneumatic valve. DETAILED DESCRIPTION

[0015] The present invention will be described in further detail below based on the accompanying drawings and specific embodiments.

[0016] Example

[0017] like Figure 1 As shown, a device for improving the absorption efficiency of dimethyl sulfoxide tail gas includes a water washing buffer tank 1, a washing liquid inlet pipe 2 is provided in the upper half of the water washing buffer tank 1, a second pneumatic valve 13 is provided on the washing liquid inlet pipe 2, a flue gas inlet pipe 3 is provided in the lower half, one end of a circulation pipe 4 is provided at the bottom, the other end of the circulation pipe 4 is connected to the upper half of the water washing buffer tank 1, a filter 5, a circulation pump 6 and a condenser 7 are provided on the circulation pipe 4 in sequence, a flue gas exhaust pipe 11 is provided on the top of the water washing buffer tank 1, and the flue gas exhaust pipe 11 is connected to the absorption section 12.

[0018] Furthermore, a drainage pipe 8 is connected in parallel to one end of the circulation pipe 4 near the bottom of the water washing buffer tank 1, and a first pneumatic valve 9 is provided on the drainage pipe 8. The drainage pipe 8 is connected to the sodium sulfite section 10. When the pH value in the water washing buffer tank 1 is too low or the liquid level is too high, the first pneumatic valve 9 is opened to discharge the waste liquid from the drainage pipe 8 into the sodium sulfite section.

[0019] Furthermore, a liquid level gauge 101 is provided on the top of the water washing buffer tank 1. The liquid level gauge 101 is interlocked with the first pneumatic valve 9 and the second pneumatic valve 13. The liquid level gauge 101 monitors the liquid level in the water washing buffer tank 1. When the liquid level reaches the minimum value, the second pneumatic valve 13 is started, and the washing liquid is replenished into the water washing buffer tank 1 through the washing liquid inlet pipe 2. When the liquid level reaches the maximum value, the first pneumatic valve 9 is started, and the washing liquid is discharged from the water washing buffer tank 1 through the drain pipe 8.

[0020] Furthermore, a pH sensor 102 is provided on the side wall of the water washing buffer tank 1. The pH sensor 102 is interlocked with the first pneumatic valve 9. The pH sensor 102 monitors the pH value of the washing liquid in the water washing buffer tank 1. When the pH value reaches the lowest value, the first pneumatic valve 9 is started to discharge the washing liquid through the drain pipe 8.

[0021] Furthermore, a temperature sensor 103 is provided on the top of the water washing buffer tank 1, and the temperature sensor 103 monitors the temperature of the flue gas after washing.

[0022] Furthermore, the circulating pipe 4 is connected to the tube layer of the condenser 7, and a circulating water inlet 701 and a circulating water outlet 702 are provided on the shell side.

[0023] Furthermore, the circulation pipe 4 is connected to the upper inner end of the water washing buffer tank 1 and is provided with a plurality of spray heads 401 to increase the spraying area of ​​the washing liquid and improve the washing effect.

[0024] The use process of the device is as follows: the flue gas from the incinerator enters the water washing buffer tank 1 through the flue gas inlet pipe 3, is washed by the spray head 401 in the tank, and the water vapor, trace nitrogen oxides, sulfur trioxide, smoke dust and sulfur particles in the flue gas are all taken away by the washing liquid. The washing liquid is filtered by the filter 5 to remove the particulate matter, and the filter 5 needs to be cleaned regularly. The filtered washing liquid is then cooled to about 50 DEG C by the condenser 7, and then is pumped into the water washing buffer tank 1 through the circulating pipeline 4. The washed flue gas enters the absorption section from the flue gas discharge pipe 11 at the top of the water washing buffer tank 1. When the pH sensor 102 detects that the pH of the washing liquid is too low or the liquid level meter 101 detects that the liquid level reaches the maximum value, the first pneumatic valve 9 is started to discharge the waste washing liquid, and the washing liquid is discharged to the sodium sulfite section 10. When the liquid level drops to the minimum value, the first pneumatic valve 9 is closed, and the second pneumatic valve 13 is started to inject new washing liquid. The reaction equations involved in the above washing process are as follows:

[0025] 3NO2+H2O=2HNO3+NO;

[0026] SO2+H2O=H2SO3;

[0027] SO3+H2O=H2SO4.

Claims

1. A device for improving the absorption efficiency of dimethyl sulfoxide tail gas, characterized in that: The invention comprises a water washing buffer tank (1), wherein a washing liquid inlet pipe (2) is provided at the upper half of the water washing buffer tank (1), a second pneumatic valve (13) is provided on the washing liquid inlet pipe (2), a flue gas inlet pipe (3) is provided at the lower half thereof, one end of a circulation pipe (4) is provided at the bottom, the other end of the circulation pipe (4) is connected to the upper half of the water washing buffer tank (1), a filter (5), a circulation pump (6) and a condenser (7) are provided on the circulation pipe (4) in sequence, a flue gas exhaust pipe (11) is provided at the top of the water washing buffer tank (1), and the flue gas exhaust pipe (11) is connected to the absorption section (12).

2. A device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 1, characterized in that: A drainage pipe (8) is connected in parallel to one end of the circulation pipe (4) near the bottom of the water washing buffer tank (1), a first pneumatic valve (9) is provided on the drainage pipe (8), and the drainage pipe (8) is connected to the sodium sulfite section (10).

3. A device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 2, characterized in that: A liquid level gauge (101) is provided on the top of the water washing buffer tank (1), and the liquid level gauge (101) is interlocked with the first pneumatic valve (9) and the second pneumatic valve (13).

4. The device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 1, characterized in that: A pH sensor (102) is provided on the side wall of the water washing buffer tank (1), and the pH sensor (102) is interlocked with the first pneumatic valve (9).

5. The device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 1, characterized in that: A temperature sensor (103) is provided on the top of the water washing buffer tank (1).

6. The device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 1, characterized in that: The circulating pipe (4) is connected to the tube layer of the condenser (7), and a circulating water inlet (701) and a circulating water outlet (702) are provided on the shell side.

7. The device for improving the absorption efficiency of dimethyl sulfoxide tail gas according to claim 1, characterized in that: The circulation pipe (4) is connected to the upper inner end of the water washing buffer tank (1) and is provided with a plurality of spray heads (401).

Images