Institute of Coal Chemical Engineering,School of Chemical Engineering,Dalian University of Technology

在加压固定床反应器中进行淖毛湖煤在常压和1.5MPa氢气和氮气中的热解试验,利用多种表征方法对比研究了氢气和氮气下的热解产物产率和组成及半焦结构的变化,并利用热重分析研究热解半焦的CO2气化反应性。结果表明:与常压N2中热解相比,煤在加压的H2中热解可有效提高热解气体中CH4和C2~C3的产率,在800℃热解CH4和C2~C3的体积产率分别由53.5和16.6mL/g增至345.6和20.8mL/g。焦油和轻质焦油产率也有效提升,在600℃下,与常压N2中热解相比,1.5MPaH2中煤热解的焦油产率由19.3%升至22.8%,焦油中脂肪烃含量由35.5%降至14.8%,单环芳烃含量由8.3%增至28.9%,轻质焦油质量分数和产率分别升至95.0%和21.8%。半焦的N2吸附和拉曼光谱分析结果表明,煤在加压H2中热解得到半焦的比表面积和孔体积由常压氮气下的40m2/g和0.05cm3/g增至289m2/g和0.16cm3/g,孔结构显著发展,有利于半焦的CO2气化反应进行;而半焦的石墨化程度及大芳香环比例增加,不利于半焦气化反应;但由热重分析得到的加压加氢热解半焦的CO2气化反应性明显提高,表明孔结构对半焦CO2气化反应性起主要作用。

The pyrolysis experiments of Naomaohu coal (NMH) at atmospheric pressure and 1.5 MPa H2and N2 were carried out in a pressurized fixed-bed reactor. The products yield and composition and char structure under H2 and N2 were comparatively investigated by various characterization methods. The CO2 gasification reactivity of char was studied by a thermogravimetric analyzer. The results indicate thatpyrolysis of coal in pressurized H2 can effectively increase the yield of CH4 and C2 -C3, from 53.5 and 16.6 mL/ g in atmospheric N2 to345.6 and 20.8 mL/ g in pressurized H2, respectively, during the coal pyrolysis at 800 ℃ . Tar yield and quality is also effectively improved. Compared coal pyrolysis at 600 ℃ under 1.5 MPa H2 with that under atmospheric pressure N2, the tar yield increases from 19.3%to 22.8%, the aliphatic hydrocarbon content decreases from 35.5% to 14.8%, the monocyclic aromatic hydrocarbon content increases from8.3% to 28.9%, and the light tar content and yield increases to 95% and 21.8%, respectively. The results of N2 adsorption and Ramanspectroscopy show that the specific surface area and pore volume of the char in pressurized hydropyrolysis increase from 40 m2 / g and0.05 cm3 / g in atmospheric N2to 289 m2 / g and 0.16 cm3 / g, and the pore structure is significantly developed. This is beneficial to theCO2 gasification reaction of char. The graphitization degree and the proportion of large aromatic ring increase, which is not conducive tothe gasification reaction of char. The thermogravimetric analysis results show that the gasification reactivity of char from pressurized hydropyrolysis is significantly higher, which indicates that pore structure plays a main role in the influence on the CO2 gasification reactivity ofthe char.

国家重点研发计划资助项目(2016YFB0600301);大连市重点领域创新团队支持计划资助项目(2019RT10)

郭二光,王贵金,陈佳奇,等.淖毛湖煤加氢热解产物特性及半焦气化反应性[J].洁净煤技术,2024,30(4):196-204.

GUO Erguang,WANG Guijin,CHEN Jiaqi,et al.Products characteristics and char gasification reactivity of Naomaohu coalhydropyrolysis[J].Clean Coal Technology,2024,30(4):196-204.