Absorption device and method for producing sulfur trioxide by using gypsum

Abstract

The invention relates to an absorption device and a method for producing sulfur trioxide by using gypsum. The device comprises an acid liquid pump and a liquid delivery pipe. A liquid outlet of the acid liquid pump is connected with the liquid delivery pipe through a flange. The liquid delivery pipe is composed of three sections of pipelines. The front-section pipeline has a cylindrical structure. The middle-section pipeline has a conical structure, and is a transition section. The back-section pipeline has a cylindrical structure. A bonding position of the middle-section pipeline and the back-section pipeline of the liquid delivery pipe is provided with a gas pipe used for delivery sulfur trioxide. A static mixer is arranged in the back-section pipeline of the liquid delivery pipe. The invention also provides an absorption method for producing sulfur trioxide by using gypsum. According to the invention, with a Venturi effect principle, and with the enhanced mixing effect of the static mixer, absorption amount of sulfur trioxide in absorption liquid is increased, and sulfur trioxide absorption rate is no lower than 90%.

Description

technical field [0001] The invention relates to a sulfur trioxide absorption device and method, in particular to an absorption device and method for producing sulfur trioxide by using gypsum. Background technique [0002] In the production process of sulfuric acid, the absorption of sulfur trioxide is generally absorbed directly by water or by sulfuric acid with a certain concentration. When a certain concentration of sulfuric acid is used to absorb sulfur trioxide, a large amount of heat will be released. This heat and the strong corrosiveness of sulfuric acid will accelerate the corrosion of the absorption tower material, and at the same time, the gas discharged at high temperature will easily carry out the sulfur trioxide gas; When absorbing sulfur trioxide with water, it will also release a lot of heat, which is easy to generate acid mist and corrode the equipment. In addition, it is difficult for this technology to completely absorb sulfur trioxide, and part of sulfur ...

AI Technical Summary

Problems solved by technology

When a certain concentration of sulfuric acid is used to absorb sulfur trioxide, a large amount of heat will be released. This heat and the strong corrosiveness of sulfuric acid will accelerate the corrosion of the absorption tower material, and at the same time, the gas discharged at high temperature will easily carry out the sulfur trioxide gas; When absorbing sulfur trioxide with water, it will also release a lot of heat, which is easy to generate acid mist, which will corrode the equipment

In addition, it is difficult for this technology to completely absorb sulfur trioxide, and part of sulfur trioxide will be discharged into the atmosphere, polluting the environment

[0003] CN201660444U discloses a kind of two-stage absorption device of oleum system on December 1, 2010, and this kind absorption device comprises nicotinic acid tower, and nicotinic acid tower is provided with two-stage absorption tower up and down, and the first stage absorption tower below is connected with Concentrated nicotinic acid circulation tank, the upper second-stage absorption tower is connected with dilute nicotinic acid circulation tank, after two-stage absorption, the absorption rate of sulfur trioxide can reach 60-65%, but the absorption rate is still low

The reaction device absorbs sulfuric acid to increase the absorption of sulfur trioxide by circulating sulfuric acid. The defect of the reaction device is that the efficiency of the whole process is too low and it is difficult to realize industrialization.

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