唐颖,吴晓丹,李乐忠,苏展,王若仪
TANG Ying,WU Xiaodan,LI Lezhong,SU Zhan,WANG Ruoyi

• 1:中海石油气电集团技术研发中心
• 2:中海油研究总院有限责任公司

摘要(Abstract)：

我国富油煤资源量巨大，原位热解不但可以实现富油煤的高效低碳利用，还极大延伸了煤炭利用的深度范围。原位加热技术是富油煤原位热解的核心技术，其工艺效率决定了富油煤原位热解经济可行性。总结富油煤热物理性质和热解特征的基础上，介绍了传导加热、对流加热、化学加热和辐射加热4种原位加热技术的发展现状，重点分析了4种加热技术的特点及其在富油煤中的适用性，并优选了富油煤原位加热的高效工艺。研究认为：(1)富油煤具有导热系数低、比热容高、热扩散系数低等热物理特点，350～650℃为主要热解阶段，提高热解温度有利于可燃气体特别是H_2的产出；(2)富油煤导热系数低，传导加热时间长，加热效率低；对流加热传热效率高，载热介质既有利于传热又有利于焦油产出；化学加热技术反应稳定性难以控制，传热依靠载热介质；辐射加热范围总体有限；(3)高效的加热技术、载热介质及传热网络是富油煤原位加热的高效条件，推荐对流加热、水蒸气及水力压裂作为首选加热技术、载热介质和致裂技术。
China has abundant tar-rich coal resources.The use of in-situ pyrolysis can make a high efficiency and low-carbon utilization of tar-rich coal and it also extends the recover depth of coal greatly. In-situ heating technology is the core technology of in-situ pyrolysis of tar-rich coal and its efficiency determines whether the in-situ pyrolysis of tar-rich coal is economical. The development status of conduction heating, convection heating, chemical heating, and radiation heating technology were introduced, their characteristics and applicability on tar-rich coal based on thermo-physical property and pyrolysis characteristic studies were discussed. The advices on high efficiency process of in-situ heating were gived in the end. This paper argues that:(1) Tar-rich coal has low thermal conductivity, high specific heat capacity and low thermal diffusion coefficient, and its main pyrolysis temperature range is 350-650 ℃. Increasing the pyrolysis temperature of tar-rich coal is conducive to the production of combustible gases, especially H_2.(2) The conduction heating technology requires long time to heat the coal, which efficiency is very low. Convective heating technology has high heat transfer efficiency and its heat-carrying medium is conducive to both heat transfer and tar production. The reaction stability of chemical heating technology is difficult to control and its heat conduction also depends on heat-carrying medium. The heating range in radiation heating technology is generally limited.(3) Efficient heating technology, heat-carrying medium and heat transfer network are the high efficiency conditions of in-situ heating for tar-rich coal. Convection heating technology is recommended as the preferred technology for in-situ heating of tar-rich coal, steam as the heat carrying medium, and hydraulic fracturing as the preferred technology for coal seam fracturing.

关键词(KeyWords)： 富油煤;原位热解;热解特征;加热技术;对流加热;高效工艺
tar-rich coal;in-situ pyrolysis;pyrolysis characteristics;heating technology;convection heating;high efficiency process

Abstract:

Keywords:

基金项目(Foundation): 中海石油气电集团科技资助项目(QDKY-2023-YFZX-02)

作者(Author): 唐颖,吴晓丹,李乐忠,苏展,王若仪
TANG Ying,WU Xiaodan,LI Lezhong,SU Zhan,WANG Ruoyi

DOI: 10.13226/j.issn.1006-6772.22101901

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