(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中南大學(xué) 中國有色金屬工業(yè)清潔冶金工程研究中心，長沙 410083)
摘 要: 富氧熔煉過程中SO3(g)的形成是設(shè)備腐蝕及污酸形成的主要原因。通過模擬計算，研究溫度、O2(g)和H2O(g)含量以及硫酸鹽的存在這4種因素對煙氣中SO3(g)、H2SO4(l)等含硫組分形成的影響。結(jié)果表明：溫度越高，越不利于SO3(g)、H2SO4(l)的形成；煙氣中O2(g)和H2O(g)的量越低，SO3(g)和H2SO4(l)含量也越低，這是控制煙氣酸性物質(zhì)生成的決定性因素；物料中硫酸鹽屬于不利因素，在一定溫度范圍內(nèi)分解生成SO3(g)和O2(g)，導(dǎo)致SO3(g)發(fā)生率增大。分析認(rèn)為，精確控制煙道漏風(fēng)量，盡可能減少物料水分和硫酸鹽含量，并延長物料在爐內(nèi)停留時間，可抑制煙氣中SO3(g)、H2SO4(l)的形成，對解決熔煉過程設(shè)備腐蝕及污酸問題有一定意義。
關(guān)鍵字: 富氧熔煉；煙氣；SO3(g)；SO2(g)；形成；抑制
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, Central South University, Changsha 410083, China）
Abstract:In oxygen-enriched smelting process, the problems of equipment corrosion and waste acid formation are closely related to the formation of SO3(g). By simulating calculation, the influences of temperature, the amount of O2(g) and H2O(g), sulphates existing on the component content of SO3(g), SO2(g) and H2SO4(l) of flue gas were studied. The results show that, the high temperature goes against the formation of SO3(g) and H2SO4(l). The higher the temperature, the less the content of SO3(g) and H2SO4(l). The less the amount of O2(g) and H2O(g), the less the content of SO3(g) and H2SO4(l). The amount of O2(g) and H2O(g) are the decisive factor to generate SO3(g) and H2SO4(l). Sulphates existing is an unfavorable factor for equipment corrosion and waste acid formation. The sulphates decompose and lead to the content of SO3(g) and O2(g) increasing at some temperature. The analysis results suggest that accuracy control of the air-leakage rates of feed opening and flue, reducing the water and sulphates content as much as possible, and prolonging the residence time in the furnace of raw materials can all inhibit the formation of SO3(g) and H2SO4(l), and has certain significance on solving the problems of equipment corrosion and waste acid formation.
Key words: oxygen-enriched smelting; flue gas; SO3(g); SO2(g); formation; inhibition
