焦炉气制乙二醇工艺技术方案优化和经济性分析

Process proposal optimization and economic analysis for coke-oven gas to ethylene glycol

为深度利用焦炉气资源,以焦炉气为原料进行转化并生产高附加值化学品,实现焦化企业节能减排和提高经济效益,结合理论及工程经验,对不同焦炉气制取乙二醇的技术方案进行全工艺流程优化,重点对比了焦炉气催化部分氧化和非催化部分氧化技术,同时对全厂工艺方案进行了经济性分析。结果表明:焦炉气转化制取合成气对全厂工艺方案影响较大,采用焦炉气非催化氧化技术制取合成气,合成气经净化和分离后制取乙二醇全厂工艺方案更优,具有投资低、消耗低和流程短等优点,乙二醇生产成本为3 974元/t,其财务内部收益率分别为25. 38%(税前)和20. 80%(税后),盈利能力较强,具备良好的经济效益和广阔的应用前景。

To achieve deep utilization of coke-oven gas to high value-added chemicals and promote energy-saving,emission reduction and economic benefit improvement for chemical plants,the overall process optimization was performed for different proposals of coke-oven gas to ethylene glycol based on theory and engineering practice.Catalytic and non-catalytic partial oxidation technology comparison and overall process economic analysis was conducted.The results show that the technology of converting coke-oven gas to syngas has greater influence on the overall process.The proposal applied non-catalytic partial oxidation technology to convert coke-oven gas to syngas which is then purified to produce ethylene glycol is optimal,because of its lower investment and utility consumption as well as shorter routes.The cost of ethylene glycol production is 3 974 RMB/t and the financial internal rate of return of this overall process is 25.38%(pre-tax)and 20.80%(after-tax).The results demonstrate excellent economic benefit and broad application prospect.