• 論文
主辦單位:煤炭科學研究總院有限公司、中國煤炭學會學術期刊工作委員會
黏結性富油煤熱解油氣析出規律及物性演變特征
  • Title

    Tar and gas production rules and physical property evolution characteristicsduring the pyrolysis of cohesive tar-rich coal

  • 作者

    唐穎吳曉丹孫景耀蘇展暢志兵王楚楚曠文昊

  • Author

    TANG Ying;WU Xiaodan;SUN Jingyao;SU Zhan;CHANG Zhibing;WANG Chuchu;KUANG Wenhao

  • 單位

    中海石油氣電集團 技術研發中心中國海洋石油集團有限公司 液化天然氣及低碳技術重點實驗室中國礦業大學(北京) 化學與環境工程學院

  • Organization
    Research & Development Center,CNOOC Gas & Power Group
    Key Laboratory of Liquefied Natural Gas andLow Carbon Technology,China National Offshore Oil Corporation
    School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing
  • 摘要

    黏結性富油煤受熱產生的軟化、熔融現象可能導致井筒堵塞和地層擾動,這是原位熱解需考慮的重要因素。在300~700℃下對黏結性富油煤熱解,考察油氣析出規律和組成性質,分析半焦的物性演變特征及其對原位熱解的指示意義。結果表明,焦油產率在500℃取得最大值7.75%,此時<300℃輕質組分含量最高(32.2%),且焦油成分在400~500℃變化顯著,酚類和芳烴含量分別呈現增大和降低趨勢。煤樣的軟化溫度和固化溫度分別為389和455℃,使半焦的宏觀孔率度在≥400℃時由不足10%增至約50%,而微觀孔隙結構僅在600~700℃高溫脫氣階段更發達;半焦導熱系數隨溫度先減小后增大,并在400℃達到最小值0.06W/(m·℃)。黏結性富油煤原位熱解面臨通道堵塞、揮發分析出受阻和煤層導熱速率偏慢等潛在問題,可嘗試采用具有破黏效應的壓裂支撐劑或近臨界水原位轉化技術加以解決。

  • Abstract

    The softening and melting of cohesive tar-rich coal caused by heating may lead to wellbore blockage and formation disturbance,which is an important factor to be considered for in-situ pyrolysis. In this paper, the pyrolysis of cohesive tar-rich coal at 300-700 ℃was conducted to investigate the oil and gas precipitation rules and their composition properties, and the evolution characteristics of physical properties of semi-coke and its indicative significance for in-situ pyrolysis were analyzed. The results shows that the tar yield reachesthe maximum value of 7.75% at 500 ℃ , and the content of light components (boiling point lower than 300 ℃ ) of the derived tar is thehighest (32.2%). The tar components chang significantly at 400-500 ℃ , and the content of phenols increases while that of aromatics decreases. The softening temperature and curing temperature of the coal sample are 389 and 455 ℃ respectively. Consequently, the macroporosity of semi-coke increases from less than 10% to about 50% at ≥400 ℃ , while the micro-pore structure is more developed only atthe high temperature stage of 600-700 ℃ . The thermal conductivity of semi-coke decreases first and then increases with temperature, andreaches a minimum value of 0.06 W/ (m·℃ ) at 400 ℃ . In-situ pyrolysis of cohesive tar-rich coal may be confronted with potentialproblems such as channel blockage, volatile precipitation obstruction and slow thermal conductivity of coal seam. These problems are expected to be solved by using fracturing proppant with viscosity breaking effect or applying near critical water in-situ conversion technology.

  • 關鍵詞

    富油煤黏結性膠質體焦油孔隙結構導熱系數

  • KeyWords

    tar-rich coal;caking property;plastic mass;tar;pore structure;heat conductivity coefficient

  • 基金項目(Foundation)
    國家自然科學基金面上資助項目(51476185);中國礦業大學(北京)越崎杰出學者資助項目(2020JCBO2);中海石油氣電集團科技資助項目(QDKY-2023-YFZX-02)
  • 文章目錄

    0 引言

    1 試驗

       1.1 試驗原料

       1.2 熱解試驗

       1.3 熱解產物表征

    2 結果與討論

       2.1 富油煤的黏結性

       2.2 熱解產物產率

       2.3 油氣產物的組成性質

       2.4 富油煤熱解物性演變特征

       2.5 黏結性富油煤原位熱解的難點和對策

    3 結論

  • DOI
  • 引用格式
    唐穎,吳曉丹,孫景耀,等.黏結性富油煤熱解油氣析出規律及物性演變特征[J].潔凈煤技術,2024,30(1):58-65.
  • Citation
    TANG Ying,WU Xiaodan,SUN Jingyao,et al.Tar and gas production rules and physical property evolution characteristicsduring the pyrolysis of cohesive tar-rich coal[J].Clean Coal Technology,2024,30(1):58-65.
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