Study on interaction and mechanisms of direct coal liquefaction residue and gas coal in coal blending during coking
Study on interaction and mechanisms of direct coal liquefaction residue and gas coal in coal blending during coking
复制标题
焦化配煤中煤直接液化残渣与气煤相互作用及机理研究
DOI：
10.1016/j.jaap.2022.105629
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发表时间：
2022
影响因子：
6
通讯作者：
Shiyong Wu
中科院分区：
文献类型：
--
作者：
Shuo Sun;Zhihui Chen;Youqing Wu;Sheng Huang;Yonghui Bai;Shiyong Wu
以煤直接液化残渣为原料，配以JM、FM、1/3 JM、QM、SM 5种烟煤，制备了坩埚焦。分析了焦炭的冷态强度和热态强度。利用煤岩学原理指导炼焦配煤，旨在探讨炼焦过程中用褐煤和QM部分替代炼焦煤（FM或JM）的机理。结果表明，当高粘煤配比在70%以下时，QM和DTR可部分替代FM或JM，DTR配比不能超过6%，以保证焦炭强度。在JT 20调合方案中，以DCLR-QM-JM调合体系取代部分JM，DCLR-QM-JM调合体系的最佳DCLR-JM比例为3%，M13提高1.20%，M3降低1.21%，CSR提高0.79%。用DCLR-QM-FM系统代替部分FM，最佳DCLR-QM-FM系统为2%，M13增加2.14%，M3下降2.13%，CSR增加1.97%。配煤过程中原料之间存在明显的相互作用，DALF和QM的作用机理可归纳为：DALF的加入使炼焦系统中的变性体与气体相互作用的温度范围向低温区扩展了50 °C。QM提供的连续气体驱动力将大量的变质体驱入煤颗粒的孔隙中，并使其与更多的惰性组分结合，从而减少反应表面，提高焦炭的热强度。·直接在焦化中使用DALDENT作为粘合剂。·DCLR-QM-JM系统的最佳分散率为3%，DCLR-QM-FM系统的最佳分散率为2%。· QM和DTH可以填补反射率图中混煤的缺口。·随着D_2O_3的加入，气液作用的温度范围扩大。
Crucible cokes were prepared by blending direct coal liquefaction residue (DCLR) with five bituminous coals (JM, FM, 1/3JM, QM, SM). The cold strength and thermal strength of cokes were analyzed. Coal petrology was used to guide and optimize coal blending for coking which was aimed at finding out the mechanism of DCLR and QM partially replacing coking coal (FM or JM) during coking. Results showed that QM and DCLR could partially replace FM or JM when the ratio of high caking coal was under 70%, and the DCLR ratio cannot exceed 6% to guarantee the coke strength. Based on blending scheme JT20, partially replacing JM with DCLR and QM (termed as DCLR-QM-JM system), the optimal DCLR ratio was 3% as M 13 increased by 1.20%, M 3 declined by 1.21% and CSR increased by 0.79%. Partially replacing FM with DCLR and QM (termed as DCLR-QM-FM system), the optimal DCLR ratio was 2% as M 13 increased by 2.14%, M 3 declined by 2.13% and CSR increased by 1.97%. There existed obvious interactions between raw materials in coal blending and the function mechanism of DCLR and QM could be concluded as follows: With the addition of DCLR, temperature range of the interaction between metaplast and gas in coking system extended to the low temperature region by 50 °C. The continuous gas driving force provided by QM drove much metaplast into the pores of coal particles and bound them to more inert components, which led to decreasing reaction surface and increasing thermal strength of coke. • DCLR was used as a binder in coking directly. • The optimal DCLR ratio was 3% in DCLR-QM-JM system and 2% in DCLR-QM-FM system. • QM and DCLR could fill the notches of coal blends in the reflectivity diagrams. • The temperature range of the interaction between metaplast and gas extended with the addition of DCLR.