摘要：
针对煤气化过程中副产物含硫气体（以H ₂ S为主，伴生COS、CS ₂ 等）回收效率低、能耗高、资源化程度低、尾气难满足超低排放要求诸种行业痛点，结合“双碳”战略下煤炭清洁高效利用及资源循环的根本需求，系统、有层次地开展了硫回收工艺优化及资源化利用研究：先用Aspen Plus软件建立煤气化副产物硫回收全流程模型，以克劳斯工艺为基础，引入纯氧燃烧与低温催化氧化耦合技术，优化工艺参数并筛选高效抗积碳催化剂，继而通过实验厘清进气组分、反应温度、压力诸因素对硫回收效率的影响规律，由此自然、合理地构建起“硫回收- 硫磺提纯- 高值化利用”闭环体系。研究结果十分明确而有力：优化后的耦合工艺总硫回收率从传统工艺的98. 3% 提高到99. 2% 以上，尾气中SO ₂ 排放量下降22. 3%，单位产品能耗降低18. 7%。更难得的是，所回收的硫磺经提纯后纯度达99. 3%，可直接用于硫酸制备或高端化工原料生产，真正实现了硫资源的高值化循环利用。因此，该研究对煤气化副产物硫回收工艺的工业升级有极好的理论支撑作用，也带来了环保、经济、社会三重效益。
关键词：煤气化；副产物；硫回收；工艺优化；资源化利用；纯氧燃烧；低温催化氧化
Study on Process Optimization and Resource Utilization of Sulfur Recovery from Coal Gasification Byproducts
HE Huilong, LI Xiong, LI Guangyin, HE Zhengzheng
(Yulin Chemical Co., Ltd., Shaanxi Coal and Chemical Industry Group Co., Ltd., Yulin, Shaanxi 719000, P. R. China)
Abstract
Aiming at the industrial problems such as low recovery efficiency, high energy consumption, insufficient resource utilization and tail gas emissions failing to meet ultra-low emission standards of sulfur-containing gases (mainly H₂S, accompanied by COS, CS₂, etc.) from coal gasification byproducts, combined with the core demands of clean and efficient utilization of coal and resource recycling under the “dual-carbon” strategy, the research on process optimization and resource utilization of sulfur recovery was carried out. A whole-process model of sulfur recovery from coal gasification byproducts was established by Aspen Plus software. Based on the Claus process, the coupled technology of pure oxygen combustion and low-temperature catalytic oxidation was introduced, the process parameters were optimized, and high-efficiency and anti-carbon deposition catalysts were selected. The influence laws of key parameters such as inlet gas composition, reaction temperature and pressure on sulfur recovery efficiency were investigated through experiments, and a closed-loop system of “sulfur recovery–sulfur purification–high-value utilization” was constructed.The results showed that the optimized coupled process could increase the total sulfur recovery rate from 98.3% to more than 99.2% compared with the traditional process, reduce SO₂ emission in tail gas by 22.3%, and decrease the unit product energy consumption by 18.7%. The recovered sulfur had a purity of 99.3% after purification, which could be directly used for sulfuric acid production or as high-end chemical raw materials, realizing the high-value recycling of sulfur resources.This study provides theoretical support and technical reference for the industrial upgrading of sulfur recovery process from coal gasification byproducts, with significant environmental, economic and social benefits.
Keywords
coal gasification; byproducts; sulfur recovery; process optimization; resource utilization; pure oxygen combustion; low-temperature catalytic oxidation
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