ABSTRACT

Crushing mechanism plays a vital role in liberation of coal macerals (organic constituents), which aid in coke making. Due to the use of impact mills, vitrinite maceral grains shatter and participation in coke making is reduced. To address this issue, a new crushing machine based on a shear fracture mechanism has been developed and termed as coal shear crusher (CSC). It is shown that by using CSC one can take advantage of the viscoelastic property of vitrinite maceral. When compared to hammer mill, CSC processed coal showed improvement in plastic layer thickness (PLT), crucible swelling number (CSN), rank and coke strength after reaction (CSR) of the coal blends. Coals with vitrinite reflectance (Ro) greater than 1%, when processed using CSC showed greater improvement in coke properties as compared to coals with less than 1% Ro. Coal blend cost reduction can be effectively obtained if CSC technology is used, by increasing the portion of poor coking coal by replacing good coking coals. Present study scopes the utilization of up to 10% of CSC processed component in the coal blend, which is currently limited due to concerns related to coal cake stability which if overcome can increase the fraction of poor-coking coal in blends even further.

摘要

破碎机制在释放有助于焦炭制造的煤质物质（有机成分）方面发挥着至关重要的作用。由于使用了冲击磨，镜质体微晶颗粒破碎，参与焦炭制造的参与度降低。为了解决这个问题，已经开发了一种基于剪切断裂机制的新型破碎机，称为煤剪切破碎机（CSC）。结果表明，通过使用 CSC，可以利用镜质体的粘弹性。与锤磨机相比，CSC 加工的煤在混煤的塑性层厚度 (PLT)、坩埚膨胀数 (CSN)、等级和反应后焦炭强度 (CSR) 方面都有所提高。镜质体反射率 (Ro) 大于 1% 的煤，当使用 CSC 处理时，与 Ro 小于 1% 的煤相比，焦炭性能的改善更大。采用CSC技术，通过替代优质焦煤增加劣焦煤比例，可有效降低配煤成本。目前的研究范围是在混合煤中使用高达 10% 的 CSC 加工组分，由于与煤饼稳定性有关的问题，目前这一点受到限制，如果克服这种问题，可能会进一步增加混合煤中劣焦煤的比例。