Method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas

Abstract

The invention discloses a method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas. A high concentration pre-conversion device and a high concentration pre-absorption device are included. The high concentration pre-conversion device is connected to a pre-absorption system through a gas pipe. The invention provides the method of preparing acid by using pre-converted and pre-absorbed high concentration flue gas. By controlling a gas splitting valve, the flue gas condition of a primary conversion system is adjusted to be steady and the influence of large concentration and quantity of smelting flue gas on an acid preparation system is reduced. By cooling the flue gas at a pre-absorption inlet by using the flue gas at the outlet of the pre-absorption system,pre-converted heat is transferred to the primary conversion system partially while the pre-absorption gas inlet temperature is reduced, so that the surplus heat of the primary conversion system is improved, and steady production of the primary conversion system is facilitated. The pre-absorption system and a primary absorption system circulate acid to achieve acid-connection, so that the acid concentration balance of the system is facilitated. The device is simple in structure and convenient to use.

Description

technical field [0001] The invention relates to the field of high-concentration flue gas acid production method using pre-transformation and pre-absorption, in particular to a high-concentration flue gas acid production method using pre-transformation and pre-absorption. Background technique [0002] A company adopts the copper smelting process of "oxygen-enriched bottom-blown molten pool smelting + converter blowing". The efficiency is close to 100%, the SO2 concentration in the output flue gas is as high as 25-30%, and the oxygen content in the flue gas is as low as 3%. The SO2 concentration after mixing is 13-18%, which belongs to high-concentration SO2 flue gas, which cannot be directly treated by the traditional two-turn two-suction acid production process. [0003] In the upgrading and transformation process of oxygen-enriched bottom blowing copper smelting enterprises, in order to increase the production capacity, the sulfuric acid system is produced according to the...

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Problems solved by technology

[0002] A company adopts the copper smelting process of "oxygen-enriched bottom-blown molten pool smelting + converter blowing". The efficiency is close to 100%, the SO2 concentration in the output flue gas is as high as 25-30%, and the oxygen content in the flue gas is as low as 3%. The mixed SO2 concentration is 13-18%, which belongs to high-concentration SO2 flue gas, which cannot be directly treated by the traditional two-turn two-suction acid production process.

[0003] In the upgrading and transformation process of oxygen-enriched bottom blowing copper smelting enterprises, in order to increase the production capacity, the sulfuric acid system is produced according to the conventional "two-transformation and two-suction" acid production method, and a large amount of air needs to be added, resulting in a large increase in the flue gas volume of the acid production system. The original acid production system cannot meet the production demand, and a complete sulfuric acid system needs to be added, which occupies a large area, requires a large investment in equipment, and the flue gas concentration is reduced, which will inevitably lead to an increase in production costs. Therefore, the flue gas acid production is from low concentration to high Concentration shift has become a development trend

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