CIESC Journal ›› 2014, Vol. 65 ›› Issue (12): 4850-4856.DOI: 10.3969/j.issn.0438-1157.2014.12.028

Previous Articles     Next Articles

Modeling, simulation and analysis for co-feed process of coal and coke-oven gas to olefins

MAN Yi, YANG Siyu, XIANG Dong, QIAN Yu   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2014-09-02 Revised:2014-09-08 Online:2014-12-05 Published:2014-12-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21136003, 21306056) and the National Basic Research Program of China (2014CB744306).

煤和焦炉气联供制烯烃过程的建模模拟与分析

满奕, 杨思宇, 项东, 钱宇   

  1. 华南理工大学化学与化工学院, 广东 广州 510640
  • 通讯作者: 钱宇
  • 基金资助:

    国家自然科学基金项目(21136003,21306056);国家重点基础研究发展计划项目(2014CB744306).

Abstract: Olefins are one of the most important platform chemicals. Developing coal-to-olefins (CTO) processes is regarded as one of promising alternatives to oil-to-olefins process. However, CTO suffers from high CO2 emission due to the high carbon contents of coal. In China, there is 7×1010 m3 coke-oven gas (COG) produced in coke plants annually. However, most of the hydrogen-rich COG is utilized as fuel or discharged directly into the air. Such situation is a waste of precious hydrogen resource and serious economic loss, which causes serious environmental pollution either. This paper proposes a novel co-feed process of coal and COG to olefins in which CH4 of COG reacts with CO2 in a dry methane reforming unit to reduce emissions, while the steam methane reforming unit produces H2-rich syngas. H2 of COG can adjust the H/C ratio of syngas. The analysis shows that the energy efficiency of the co-feed process increases about 10 %, while at the same time, CO2 emission is reduced by around 95 % in comparison to the conventional CTO process.

Key words: computer simulation, syngas, systems engineering, coke-oven gas, dry methane reforming, steam methane reforming, olefins

摘要: 由于煤富碳少氢,煤制烯烃过程生产1 t产品将排放约5.8 t CO2.与此同时,中国焦炭工业每年产生约7×1010 m3的副产物焦炉气,这些富氢的焦炉气大多被燃烧或直接排放进入大气,对环境造成严重影响的同时还浪费了巨大的经济价值.本文对焦炉气辅助煤制烯烃的新过程进行了建模模拟与系统分析.焦炉气与煤元素互补,焦炉气中的H2可用来调节合成气的氢碳比;CH4可通过甲烷水蒸气重整和甲烷干重整两个过程,提高合成气的氢碳比的同时降低煤制烯烃过程排放的CO2,提高碳元素利用率,实现节能减排.这个新的联供过程的能效比煤制烯烃过程提高了约10个百分点,而CO2排放量则减少了约95%.

关键词: 计算机模拟, 合成气, 系统工程, 焦炉气, 甲烷干重整, 甲烷水蒸气重整, 烯烃

CLC Number: