Method for recovering low-temperature level heat energy in acid making in sulfuric acid production

Abstract

The invention discloses a method for recovering low-temperature level heat energy in acid making in sulfuric acid production. A heat energy recovery device consists of a screw expansion generating set, a circulating pump and a desalted water heater; high temperature circulating acid out of an absorption tower in the acid making procedure is introduced into the desalted water heater and subjected to heat exchange and temperature reduction, and then returns to the system for circular absorption, and the heat energy released is brought out by deoxidized and desalted water; the deoxidized and desalted water is heated, enters a working medium heater, releases heat and exchanges heat through a pipeline pump; a working medium with low boiling point indirectly exchanges heat with the desalted water, or the working medium with the low boiling point indirectly exchanges heat with sulfuric acid directly; the working medium is heated, evaporated and boosted, and then generates power through the screw expansion generating set or directly drags other equipment; and the working medium is continuously circulated, and the low-temperature level heat energy of the circulating acid is recovered. The method can save power consumption of circulating cooling water, reduce water supplement quantity of the circulating water, recover the heat energy and is suitable for sulfuric acid manufacturers using sulfur or brasses as a raw material.

Description

technical field [0001] The invention relates to sulfuric acid, in particular to a method for recovering low-temperature heat energy in the acid production process in the sulfuric acid production process. Background technique [0002] In the process of sulfuric acid production, most of the low-temperature heat energy in the acid production section is taken away by circulating cooling water. This heat accounts for about 30% of the total calorific value in the sulfuric acid production process. This not only consumes a large amount of circulating water and corresponding power , and caused the loss of low-temperature heat energy. [0003] In order to recycle this heat, researchers at home and abroad continue to try various effective ways. So far, the relatively mature low-temperature heat energy recovery process for acid production is the "HRS" system developed by Monsanto Company of the United States. After potential heat energy, low-pressure saturated steam of 0.4-1.0MPa is ge...

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Problems solved by technology

[0008] The object of the present invention is to provide a method for recovering low-temperature heat energy of acid production in the production of sulfuric acid, so as to solve the problem that the low-temperature heat energy of the acid production process is difficult to recover in the production process of sulfuric acid

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