A device and method for improving low-temperature heat recovery of sulfuric acid produced from ore or smelting flue gas

Abstract

The invention discloses a device and method for improving low-temperature heat recovery of sulfuric acid produced from mine or smelting flue gas. The sulfuric acid device is provided with a moisture absorption system, and the moisture absorption system is connected with the low-temperature heat recovery system and the drying system through pipelines, and the The sulfuric acid in the moisture absorption system is used as the serial acid of the mixer of the low-temperature heat recovery system. Using this method, the steam production rate of the low-temperature heat recovery system of the sulfuric acid plant from ore or smelting flue gas can be changed from the usual 0.3 to 0.35 tons of steam / ton of acid, Increase to 0.46-0.53 tons of steam / ton of acid, and increase the steam production rate by more than 50%.

Description

technical field [0001] The invention belongs to the field of waste heat or waste heat recovery, and in particular relates to a device and method for improving low-temperature heat recovery of sulfuric acid produced from ore or smelting flue gas. Background technique [0002] At present, domestic and foreign mining or smelting gas acid production industries are equipped with medium-pressure waste heat boilers to recover the waste heat of high-temperature flue gas after the fluidized fluidized furnace (or smelting furnace), and are equipped with economizers in the conversion section to recover the conversion reaction (conversion of sulfur dioxide to trioxide sulfur), some devices in the dry suction section have been equipped with a low-temperature heat recovery system, and the low-temperature heat recovery system can be found in the patent "A Device and Method for Improving the Heat Recovery Efficiency of Ore or Smelting Gas Acid Production" , application number: 201410127399....

AI Technical Summary

Problems solved by technology

Therefore, when the temperature of the flue gas from the purification section increases or the concentration of acid produced by the sulfuric acid plant increases, the amount of acid that is connected to the low-temperature heat recovery system in the drying system is greater, and the temperature of the sulfuric acid that is connected to the low-temperature heat recovery system is higher than that of the sulfuric acid. The high temperature of 60 ~ 100 ℃, that is, the heat brought out of the low temperature heat recovery system is greatly increased, thus reducing the effect of low temperature heat recovery

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