铜冶炼烟气中单体硫生成影响因素的热力学分析

Thermodynamic analysis for influence factors on generation of elemental sulfur in copper-smelting flue gas

利用FactSage软件对铜熔炼的气相进行热力学平衡研究,分析烟气中单体硫生成的机理,详细考察了气相初始含量和温度等因素对平衡烟气中单体硫含量的影响规律,并为降低单体硫的含量提供了可行的技术方案。结果表明:CO对SO_2、H_2O具有还原作用,从而生成S_2、H_2S、H_2等气体物质。平衡烟气中单体硫含量随着CO和SO_2初始含量的升高以及H_2O初始含量的降低而升高。适当提高烟气温度对于减少单体硫的生成是有利的。在烟气中通入一定量的富氧空气可使单体硫的含量大幅下降,但通入过量的空气会降低烟气的温度,对单体硫的去除反而不利。

The thermodynamic equilibrium was investigated for the gaseous system of copper smelting using Factsage software. The mechanism was analyzed for the generation of elemental sulfur. The effects of initial amounts on gaseous components and temperature on the equilibrium amount of elemental sulfur were assessed. Obviously, the technical method for reducing the amount of elemental sulfur was presented. The results show that CO can reduce SO2, H2O to generate the low-valence gas, such as S2, H2S, H2. The equilibrium amount of S2 increases with the increase of CO, SO2 and the decrease of H2O. Increasing the temperature properly is beneficial to inhibit the generation of elemental sulfur. The S2 amount sharply decreases by blowing a certain amount of oxygen-enriched air into the flue gas, but excess air will reduce the temperature of flue gas, which is harmful for the removal of elemental sulfur.