Method for removing and utilizing absorption circulating acid heat in sulfuric acid process

Abstract

The invention discloses a method for removing and utilizing absorption circulating acid heat in a sulfuric acid process. The method is characterized in that absorption circulating acid is subjected toheat exchange through an absorption acid cooler, after exchanging heat with the absorption circulating acid, cooling water in the absorption acid cooler is outputted to a closed circulating cooling water unit or a waste heat utilizing unit; in a non-heating period, the cooling water subjected to heat exchange is subjected to heat exchange through the closed circulating cooling water unit and thenis conveyed back to the absorption acid cooler; and in the heating period, heating return water in a heating system exchanges heat with the cooling water which enters the waste heat utilizing unit and is subjected to heat exchange, and then the heating return water is conveyed back to the heating system through a heating circulating pump. According to the method, the heat of the absorption circulating acid in the acid making process can be removed, and the ideal effect that the consumption of new water is almost zero can be achieved while the waste heat of the absorption circulating acid is efficiently recycled.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for removing and utilizing heat of absorption cycle acid in a sulfuric acid process. Background technique [0002] In the two-turn-two-suction process of the sulfuric acid process, the acid heat of the absorption cycle in the absorption process mainly comes from flue gas sensible heat, SO 3 Heat of absorption, heat of sulfuric acid formation and heat of dilution, in order to maintain SO in the absorption tower 3 Stable and efficient absorption, it is necessary to keep the temperature, flow rate and concentration of the absorption acid entering the tower relatively stable, the acid exiting the tower enters the circulation tank, the acid concentration is adjusted through series acid and water addition, and the absorption acid circulation pump is sent to the anode protection acid cooler for removal Remove heat, and then uniformly distribute acid to the packing la...

AI Technical Summary

Problems solved by technology

The heat removal and utilization of absorption acid cycle acid, the traditional open circulating cooling water system is adopted to absorb the heat of cycle acid heat removal, usually there are common problems of water resource waste and waste heat can not be fully utilized, sulfuric acid production of low-grade heat energy utilization has been listed in the national Therefore, it is of great significance to improve the utilization level of waste heat in the sulfuric acid industry

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