Countercurrent absorption device for sulfurous acid

Abstract

The utility model discloses a countercurrent absorption device for sulfurous acid, which consists of a process water pipe, a tail gas fan, a third-stage absorption tower, a second-stage absorption tower, a shower nozzle, a first-stage absorption tower, a finished product acid pump, a sulfur furnace, a circulating acid pump and a baffle plate. According to the sulfur dioxide absorption tower disclosed by the invention, the problems that sulfur dioxide gas is not thoroughly absorbed and tail gas pollutes the environment in a sulfurous acid preparation process are solved by adopting countercurrent absorption of the flow direction of sulfur dioxide gas and the flow direction of process water and adopting an absorption mode of combining a shower nozzle and baffle plate water distribution; the sulfur dioxide gas absorption efficiency is high, and equipment and power energy are saved.

Description

Technical Field

[0001] This utility model relates to the technical field of sulfurous acid preparation in the corn starch production process, and directly relates to a countercurrent absorption device for sulfurous acid. Background Technology

[0002] Currently, the preparation of sulfurous acid is a key technology in the corn starch production process. Traditional sulfurous acid preparation uses a simple absorption tower, which has low absorption efficiency and pollutes the environment with exhaust gas. Therefore, it is essential to study a countercurrent absorption device for sulfurous acid. Summary of the Invention

[0003] The purpose of this invention is to address the problems of low sulfur dioxide absorption efficiency and sulfur dioxide pollution in the tail gas during traditional sulfurous acid preparation processes. The invention proposes a countercurrent absorption device for sulfurous acid, the technical solution of which is as follows:

[0004] This utility model discloses a countercurrent absorption device for sulfurous acid, comprising a process water pipe 1, a tail gas blower 2, a three-stage absorption tower 3, a two-stage absorption tower 4, a shower-type nozzle 5, a first-stage absorption tower 6, a finished acid pump 7, a sulfur furnace 8, a circulating acid pump 9, and a baffle plate 10. The process water pipe 1 is connected to the shower-type nozzle 5 inside the three-stage absorption tower 3 via pipes and valves. The tail gas blower 2 is connected to the tail gas outlet of the three-stage absorption tower 3 via pipes and valves. The gas inlet of the three-stage absorption tower 3 is connected to the gas outlet of the two-stage absorption tower 4 via pipes. The sulfurous acid solution liquid outlet of the three-stage absorption tower 3 is connected to the inlet of the circulating acid pump 9 via pipes and valves. The outlet of the circulating acid pump 9 is connected to... The gas inlet of the secondary absorption tower 4 is connected to the shower-type nozzle 5 inside the secondary absorption tower 4 via pipes and valves. The gas outlet of the secondary absorption tower 4 is connected to the gas outlet of the primary absorption tower 6 via pipes. The sulfurous acid solution outlet of the secondary absorption tower 4 is connected to the sulfurous acid solution inlet of the primary absorption tower 6 via pipes and valves. Baffles 10 are evenly arranged inside the primary absorption tower 6. The gas inlet of the primary absorption tower 6 is connected to the gas outlet of the sulfur furnace 8 via pipes. The sulfurous acid solution outlet of the primary absorption tower 6 is connected to the inlet of the finished acid pump 7 via pipes and valves. The finished acid pump 7 is connected to the production station on one side and to the process water pipe 1 on the other side via pipes and valves to adjust the system concentration.

[0005] Furthermore, the three-stage absorption tower 3 and the two-stage absorption tower 4 are equipped with shower-type nozzles 5. The shower-type nozzles 5 spray liquid evenly across the entire horizontal interface of the absorption tower, ensuring that the sprayed water mist is evenly dispersed.

[0006] Furthermore, baffles are evenly distributed inside the primary absorption tower 6, and the sulfurous acid solution flows laminarly from top to bottom inside the primary absorption tower 6, absorbing sulfur dioxide gas while simultaneously cooling the sulfur dioxide gas.

[0007] The purpose of this invention is achieved as follows: Sulfur dioxide gas generated from sulfur combustion in a sulfur furnace enters a primary absorption tower. Inside the primary absorption tower, it comes into contact with a sulfurous acid solution flowing downwards through baffles. Partial absorption of the sulfur dioxide gas occurs, while the temperature decreases and the sulfur dioxide content in the sulfurous acid solution continues to increase. The remaining sulfur dioxide gas exits through the top outlet of the primary absorption tower and enters the bottom of a secondary absorption tower via a pipe. At the bottom of the secondary absorption tower, the sulfur dioxide gas gradually rises and comes into countercurrent contact with a low-concentration sulfurous acid solution sprayed from a sprinkler nozzle, where it continues to be absorbed. After absorbing the sulfur dioxide gas, the sulfurous acid solution... As the concentration continues to rise, the sulfur dioxide content in the sulfur dioxide gas continues to decrease. After being absorbed in the secondary absorption tower, the low-concentration sulfur dioxide gas enters the sulfur dioxide gas inlet at the bottom of the tertiary absorption tower through the top outlet and pipeline of the secondary absorption tower. At the bottom of the tertiary absorption tower, the low-concentration sulfur dioxide gas gradually rises and comes into countercurrent contact with the process water sprayed from the sprinkler nozzles in the tertiary absorption tower for absorption. The sulfur dioxide in the low-concentration sulfur dioxide gas is completely absorbed by the process water. After absorbing the sulfur dioxide gas, the process water is converted into sulfurous acid solution. The sulfur dioxide gas containing trace amounts of sulfur dioxide is extracted by the tail gas fan at the top of the tertiary absorption tower.

[0008] Furthermore, the sulfurous acid solution flows to the tertiary absorption tower, the secondary absorption tower, and the primary absorption tower, where the concentration of the sulfurous acid solution gradually increases; the sulfur dioxide gas flows to the primary absorption tower, the secondary absorption tower, and the tertiary absorption tower, where the sulfur dioxide content in the sulfur dioxide gas gradually decreases, and the entire absorption process achieves countercurrent contact absorption.

[0009] The beneficial effects of this invention are as follows: through the countercurrent contact absorption of process water and sulfur dioxide gas, the process water absorbs sulfur dioxide gas and converts it into sulfurous acid solution, with the concentration continuously increasing; in the continuous countercurrent contact between sulfur dioxide gas and low-concentration sulfurous acid, sulfur dioxide gas is effectively absorbed, achieving the goal of optimal sulfur dioxide absorption effect. Compared with the traditional sulfur dioxide absorption rate of 95%, this device achieves an absorption rate of 99%, which not only saves sulfur raw materials but also reduces the pollution of the environment by the exhaust gas. Attached Figure Description

[0010] Appendix Figure 1 A schematic diagram of the structure of a countercurrent absorption device for sulfurous acid according to this invention is shown.

[0011] Explanation of reference numerals in the attached figures:

[0012] 1. Process water pipe; 2. Exhaust gas fan; 3. Three-stage absorption tower; 4. Two-stage absorption tower; 5. Shower-type nozzle; 6. One-stage absorption tower; 7. Finished acid pump; 8. Sulfur furnace; 9. Circulating acid pump; 10. Baffle plate. Detailed Implementation

[0013] Now combined with the appendix Figure 1 The present invention provides a further description of a countercurrent absorption device for sulfurous acid.

[0014] This utility model discloses a countercurrent absorption device for sulfurous acid, comprising a process water pipe 1, a tail gas blower 2, a three-stage absorption tower 3, a two-stage absorption tower 4, a shower-type nozzle 5, a first-stage absorption tower 6, a finished acid pump 7, a sulfur furnace 8, a circulating acid pump 9, and a baffle plate 10. The process water pipe 1 is connected to the shower-type nozzle 5 inside the three-stage absorption tower 3 via pipes and valves. The tail gas blower 2 is connected to the tail gas outlet of the three-stage absorption tower 3 via pipes and valves. The gas inlet of the three-stage absorption tower 3 is connected to the gas outlet of the two-stage absorption tower 4 via pipes. The sulfurous acid solution liquid outlet of the three-stage absorption tower 3 is connected to the inlet of the circulating acid pump 9 via pipes and valves. The outlet of the circulating acid pump 9 is connected to... The gas inlet of the secondary absorption tower 4 is connected to the shower-type nozzle 5 inside the secondary absorption tower 4 via pipes and valves. The gas outlet of the secondary absorption tower 4 is connected to the gas outlet of the primary absorption tower 6 via pipes. The sulfurous acid solution outlet of the secondary absorption tower 4 is connected to the sulfurous acid solution inlet of the primary absorption tower 6 via pipes and valves. Baffles 10 are evenly arranged inside the primary absorption tower 6. The gas inlet of the primary absorption tower 6 is connected to the gas outlet of the sulfur furnace 8 via pipes. The sulfurous acid solution outlet of the primary absorption tower 6 is connected to the inlet of the finished acid pump 7 via pipes and valves. The finished acid pump 7 is connected to the production station on one side and to the process water pipe 1 on the other side via pipes and valves to adjust the system concentration.

[0015] The working principle of this invention is as follows: a countercurrent contact absorption method is adopted, in which a low concentration of sulfurous acid solution absorbs a low concentration of sulfur dioxide gas; and a higher concentration of sulfurous acid solution absorbs a higher concentration of sulfur dioxide gas. The countercurrent contact absorption is carried out step by step to achieve the most thorough absorption and the best absorption effect.

[0016] In the preparation and absorption process of sulfurous acid, this invention employs two water distribution methods in the absorption tower: a sprinkler-type nozzle and a baffle plate. The sprinkler-type nozzle achieves uniform water distribution and optimal absorption effect, while the baffle plate water distribution extends the residence time of sulfurous acid on the baffle plate, thus simultaneously cooling the sulfur dioxide gas after combustion.

Claims

1. A countercurrent absorption device for sulfurous acid, comprising a process water pipe (1), a tail gas blower (2), a three-stage absorption tower (3), a two-stage absorption tower (4), a shower-type nozzle (5), a first-stage absorption tower (6), a finished acid pump (7), a sulfur furnace (8), a circulating acid pump (9), and a baffle plate (10), characterized in that: The process water pipe (1) is connected to the shower nozzle (5) inside the tertiary absorption tower (3) via pipes and valves. The tail gas fan (2) is connected to the tail gas outlet of the tertiary absorption tower (3) via pipes and valves. The gas inlet of the tertiary absorption tower (3) is connected to the gas outlet of the secondary absorption tower (4) via pipes. The sulfurous acid solution liquid outlet of the tertiary absorption tower (3) is connected to the inlet of the circulating acid pump (9) via pipes and valves. The outlet of the circulating acid pump (9) is connected to the shower nozzle (5) inside the secondary absorption tower (4) via pipes and valves. The gas inlet of the secondary absorption tower (4) is connected to the shower nozzle (5) inside the secondary absorption tower (4) via pipes and valves. The gas outlet of the primary absorption tower (6) and the liquid outlet of the sulfurous acid solution of the secondary absorption tower (4) are connected to the liquid inlet of the sulfurous acid solution of the primary absorption tower (6) through pipes and valves. Baffles (10) are uniformly arranged inside the primary absorption tower (6). The gas inlet of the primary absorption tower (6) is connected to the gas outlet of the sulfur furnace (8) through pipes. The liquid outlet of the sulfurous acid solution of the primary absorption tower (6) is connected to the inlet of the finished acid pump (7) through pipes and valves. The finished acid pump (7) is connected to the production station through one pipe and to the process water pipe (1) through the other pipe to adjust the system concentration.

2. The countercurrent absorption device for sulfurous acid according to claim 1, characterized in that: Shower-type nozzles (5) are installed inside the three-stage absorption tower (3) and the two-stage absorption tower (4); baffles (10) are evenly distributed inside the first-stage absorption tower (6).

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