Sulfuric acid tail gas desulphurization device and method

Abstract

The invention relates to a sulfuric acid tail gas desulphurization device and method. A multi-layer spraying, cleaning and defogging device and anti-blocking design are adopted in a desulphurization tower, and the three functions of desulphurization, cleaning and defogging are integrated by the tower. The bottom of the desulphurization tower is connected into a liquid outlet pipe and a circulating pump. The circulating pump is connected to a mixing device through a pipe. The mixing device is connected with an ammonia water pump through a pipe and connected into an ammonia water tank. Circulating solutions in the tower are ammonium sulfite and ammonium hydrogen sulfite. The higher desulphurization efficiency can be reached. The mixing device is connected into a first-level oxidation tank through a pipe and connected into a second-level oxidation tank. Secondary hydrogen peroxide oxidation outside the desulphurization tower is conducted, an ammonium sulfite solution and hydrogen peroxide fully react with each other through stirring of the air, the oxidation rate of the ammonium sulfite can reach over 98%, the quality of a by-product ammonium sulfate solution is guaranteed reliably, absorption, adjustment and oxidation are conducted on sulfuric acid tail gas, ammonium sulfate is generated, operating devices are fewer, and low power consumption and the energy-saving effect are achieved.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and relates to tail gas treatment in the production process of sulfuric acid up to standard discharge, or rational utilization of by-products without pollutant discharge, in particular to a sulfuric acid tail gas desulfurization device and method. Background technique [0002] At present, the desulfurization technologies commonly used in industry include semi-dry method and dry method, limestone-gypsum wet method (FGD), double alkali method, seawater desulfurization method and other technologies for tail gas desulfurization, but the above-mentioned desulfurization technologies generally have some problems , such as complex system, high catalyst loss, high equipment cost, large investment, high system operation and maintenance costs, low desulfurization efficiency, and inability to handle by-products, etc. [0003] In recent years, the development and application of ammoni...

AI Technical Summary

Problems solved by technology

[0004] The ammonium sulfite produced by ammonia desulfurization is oxidized by air to produce more than 30% ammonium sulfate solution. The equipment investment is relatively large and the stability is not enough. Ammonium sulfite still exists in the product. As a raw material for compound fertilizer production, sulfur dioxide emissions will be generated, affecting The production of compound fertilizer is not good for the environment

Images