CN-224207740-U - Countercurrent absorption device for sulfurous acid

Abstract

The utility model discloses a countercurrent absorption device of sulfurous acid, which consists of a process water pipe, a tail gas fan, a three-stage absorption tower, a two-stage absorption tower, a shower nozzle, a first-stage absorption tower, a finished acid pump, a sulfur furnace, a circulating acid pump and a baffle plate, wherein in the preparation process of sulfurous acid for producing corn starch, the absorption mode of combining the flow direction of sulfur dioxide gas with the flow direction of process water and water distribution of a shower nozzle and a baffle plate is adopted, so that the problems of incomplete absorption of sulfur dioxide gas and environmental pollution of tail gas in the preparation process of sulfurous acid are solved, and compared with the absorption of a single absorption tower in the same industry at present, the absorption efficiency of sulfur dioxide gas is high, and equipment and power energy are saved.

Inventors

• Xie Pinpin
• LIU JINGXIU
• LIU XIANYING
• WANG XINGLONG
• WANG GANG

Assignees

• 山东祥瑞药业有限公司

Dates

Publication Date

20260508

Application Date

20250605

Claims (2)

1. 1. A countercurrent absorption device for sulfurous acid comprises a process water pipe (1), a tail gas fan (2), a three-stage absorption tower (3), a second-stage absorption tower (4), a shower 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), and is characterized in that the process water pipe (1) is connected with the shower nozzle (5) in the three-stage absorption tower (3) through a pipeline and a valve, the tail gas fan (2) is connected with a tail gas outlet of the three-stage absorption tower (3) through a pipeline and a valve, a gas inlet of the three-stage absorption tower (3) is connected with a gas outlet of the second-stage absorption tower (4) through a pipeline, a sulfurous acid solution liquid outlet of the three-stage absorption tower (3) is connected with an inlet of the circulating acid pump (9) through a pipeline and a valve, an outlet of the circulating acid pump (9) is connected with the shower nozzle (5) in the second-stage absorption tower (4) through a pipeline, a gas inlet of the second-stage absorption tower (4) is connected with a gas outlet of the first-stage absorption tower (6) through a pipeline, a sulfurous acid liquid outlet of the second-stage absorption tower (4) is connected with a valve in the interior of the baffle plate (6) through a pipeline, the sulfurous acid liquid outlet of the first-stage absorption tower (6) is uniformly arranged, the gas inlet of the first-stage absorption tower (6) is connected with the gas outlet of the sulfur furnace (8) through a pipeline, the sulfurous acid solution outlet of the first-stage absorption tower (6) is connected with the inlet of the finished acid pump (7) through a pipeline and a valve, the finished acid pump (7) is connected with the production post through one path of the pipeline and the valve, and the other path of the finished acid pump is connected with the process water pipe (1) to adjust the concentration of the system.
2. 2. The countercurrent absorption device for sulfurous acid according to claim 1 is characterized in that shower nozzles (5) are arranged in the three-stage absorption tower (3) and the two-stage absorption tower (4), and baffle plates (10) are uniformly distributed in the first-stage absorption tower (6).

Description

Countercurrent absorption device for sulfurous acid Technical Field The 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 of sulfurous acid. Background At present, in the corn starch production process, the preparation of sulfurous acid is a key technology, the traditional preparation of sulfurous acid adopts a simple absorption tower for absorption, the absorption efficiency is low, the tail gas pollutes the environment, and a countercurrent absorption device for sulfurous acid is very necessary to be researched. Disclosure of Invention The utility model aims at solving the problems of low sulfur dioxide absorption efficiency and environmental pollution caused by sulfur dioxide contained in tail gas in the traditional sulfurous acid preparation process, and researches a countercurrent absorption device of sulfurous acid, and the technical scheme is as follows: The utility model relates to a countercurrent absorption device for sulfurous acid, which consists of a process water pipe 1, a tail gas fan 2, a three-stage absorption tower 3, a second-stage absorption tower 4, a shower 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, wherein the process water pipe 1 is connected with the shower nozzle 5 in the three-stage absorption tower 3 through a pipeline and a valve, the tail gas fan 2 is connected with a tail gas outlet of the three-stage absorption tower 3 through a pipeline, a gas inlet of the three-stage absorption tower 3 is connected with a gas outlet of the second-stage absorption tower 4 through a pipeline, a sulfurous acid solution liquid outlet of the third-stage absorption tower 3 is connected with an inlet of the circulating acid pump 9 through a pipeline and a valve, an outlet of the circulating acid pump 9 is connected with a gas outlet of the second-stage absorption tower 4 through a pipeline and a valve, a sulfurous acid solution liquid outlet of the second-stage absorption tower 4 is connected with a sulfurous acid solution liquid inlet of the first-stage absorption tower 6 through a pipeline and a valve, a baffle plate 10 is uniformly arranged in the first-stage absorption tower 6, a gas inlet of the first-stage absorption tower 6 is connected with a gas inlet of the product sulfuric acid pump 6 through a pipeline and a valve system, and a concentration of the second-stage absorption tower 7 is connected with a pipeline through a pipeline and a valve 7, and the concentration of the second-stage absorption pump is connected with a pipeline 1. Furthermore, the sprinkler type nozzles 5 are arranged in the three-stage absorption tower 3 and the two-stage absorption tower 4, and the sprinkler type nozzles 5 spray liquid and uniformly distribute on the horizontal interface of the whole absorption tower, so that uniform dispersion of sprayed water mist is ensured. Furthermore, baffle plates are uniformly distributed in the first-stage absorption tower 6, and the sulfurous acid solution flows from top to bottom in the first-stage absorption tower 6 to absorb sulfur dioxide gas and cool the sulfur dioxide gas. The method is realized by the steps that sulfur dioxide generated by burning sulfur in a sulfur furnace enters a first-stage absorption tower, the sulfur dioxide is contacted with a sulfurous acid solution flowing down from top to bottom through a baffle plate in the first-stage absorption tower, the temperature of the sulfur dioxide is reduced, the sulfur dioxide content in the sulfurous acid solution is continuously increased, the rest sulfur dioxide enters the bottom of a second-stage absorption tower through an outlet at the top of the first-stage absorption tower, the sulfur dioxide gradually increases, the sulfur dioxide is continuously absorbed by countercurrent contact with a low-concentration sulfurous acid solution sprayed out of a shower nozzle in the second-stage absorption tower, the concentration of the sulfurous acid solution is continuously increased after the sulfur dioxide is absorbed, the sulfur dioxide content in the sulfur dioxide continuously decreases, the low-concentration sulfur dioxide gas after being absorbed in the second-stage absorption tower enters a sulfur dioxide inlet at the bottom of a third-stage absorption tower through an outlet at the top of the second-stage absorption tower and a pipeline, the low-concentration sulfur dioxide gas gradually increases, the sulfur dioxide in the low-concentration sulfur dioxide gas is absorbed by countercurrent contact with a process water shower nozzle in the third-stage absorption tower, the low-concentration sulfur dioxide is thoroughly absorbed by the process water after the sulfur dioxide gas is absorbed into the sulfurous acid solution, and the sulfur dioxide is extracted from the tail gas through a fan at the t