化工学报 ›› 2022, Vol. 73 ›› Issue (4): 1714-1723.DOI: 10.11949/0438-1157.20211584

• 能源和环境工程 • 上一篇    下一篇

绿氢重构的粉煤气化煤制甲醇近零碳排放工艺研究

孟文亮1,2(),李贵贤1,2(),周怀荣1,2,李婧玮1,2,王健1,2,王可1,2,范学英3,王东亮1,2()   

  1. 1.兰州理工大学石油化工学院,甘肃 兰州 730050
    2.甘肃省低碳能源化工重点实验室,甘肃 兰州 730050
    3.中国石油兰州石化公司自动化研究院,甘肃 兰州 730060
  • 收稿日期:2021-11-09 修回日期:2021-12-22 出版日期:2022-04-05 发布日期:2022-04-25
  • 通讯作者: 李贵贤,王东亮
  • 作者简介:孟文亮(1996—),男,博士研究生,mengwla@163.com
  • 基金资助:
    甘肃省科技重大专项(19ZD2GD001);甘肃省高等学校产业支撑计划项目(2020C-06)

A novel coal to methanol process with near zero CO2 emission by pulverized coal gasification integrated green hydrogen

Wenliang MENG1,2(),Guixian LI1,2(),Huairong ZHOU1,2,Jingwei LI1,2,Jian WANG1,2,Ke WANG1,2,Xueying FAN3,Dongliang WANG1,2()   

  1. 1.School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, Gansu, China
    3.Automation Institute, PetroChina Lanzhou Petrochemical Company, Lanzhou 730060, Gansu, China
  • Received:2021-11-09 Revised:2021-12-22 Online:2022-04-05 Published:2022-04-25
  • Contact: Guixian LI,Dongliang WANG

摘要:

在“碳达峰、碳中和”的背景下,传统煤制甲醇工艺存在CO2排放强度大、能耗高等问题成为制约煤制甲醇工艺发展的瓶颈问题。本研究基于外源性的绿氢,重构粉煤气化煤制甲醇工艺,省掉了空分单元、变换单元,开发了短流程低温甲醇洗单元,提出了粉煤气化集成绿氢的近零碳排放煤制甲醇新工艺。从碳元素利用率、CO2排放、成本分析等角度对新工艺进行了评价。结果表明,与传统煤制甲醇工艺相比,新工艺碳元素利用率从41.50%提高到95.77%,CO2直接排放量由1.939降低至0.035 t·(t MeOH)-1,通过分析H2价格与碳税对产品成本的影响发现,当氢气价格和碳税分别为10.36 CNY·(kg H2)-1和223.3 CNY·(t CO2)-1时,两种工艺的产品成本相当。新工艺不仅减少了煤制甲醇过程碳排放,而且可以提高可再生能源就地消纳能力,具有良好的应用前景。

关键词: 煤制甲醇, 绿氢, 二氧化碳, 过程集成, 过程系统, 优化设计

Abstract:

In the context of “Emission peak, Carbon neutrality”, high CO2 emission intensity, and low carbon utilization efficiency greatly restrict the development of the coal to methanol(CTM) process. A novel CTM process is proposed in the paper,which is near zero carbon emission by pulverized coal gasification integrated green hydrogen. In this case, the air separator and water-gas shift units can be eliminated, and acid gas removal unit also can be simplified. The key parameters are analyzed on the basis of established model of the two processes. The advantages of novel process are manifested in detail in comparison with the CTM process. The results show that the carbon utilization rate of the CTM process and the novel process are 41.50% and 95.77%, and the CO2 direct emission intensity is decreased from 1.939 to 0.035 t·(t MeOH)-1. An analysis of the impact of hydrogen prices and carbon taxes on product costs reveals that when the hydrogen price and carbon tax are 10.36 CNY·(kg H2)-1 and 223.3 CNY·(t CO2)-1, the production cost of two processes is equal. The new technology not only reduces carbon emissions from the CTM process, but also improves the on-site absorption capacity of renewable energy, which has good application prospects.

Key words: coal to methanol, green hydrogen, carbon dioxide, process integration, process systems, optimal design

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