风选调湿技术对炼焦煤焦化性能的影响

Effect of air-selection and moisture control technology on coking coal coking performance

采用炼焦煤风选调湿技术,对混合煤进行了风选分级,并通过煤样分析、堆密度试验和40kg焦炉炼焦试验,分析了风选调湿分级粉碎后粒度分布与湿度对焦化性能的影响。对炼焦煤样按分级粉碎与不分级粉碎处理,并在此基础上进行选择性筛分和细度调整,按6种粒度分布进行对比试验。结果表明,采用分级粉碎焦炭的抗碎强度M40提高1.9%~5.8%,耐磨强度M10改善0.1%~0.3%;煤样的粉碎细度从73.0%提高到84.0%,焦炭的抗碎强度提高2.4%~4.1%,焦炭的耐磨强度改善0.5%~0.7%;筛除部分小于1mm颗粒的煤样堆密度提高,焦炭的耐磨强度改善。煤样的堆密度随着煤样水分的增加而逐渐减小,当煤样水分大于8%时逐渐趋于稳定。给出了堆密度与煤样水分的非线性回归方程,进行了中位径、煤样水分对堆密度影响的双因素方差分析。研究结果有利于风选调湿技术的工程优化设计改进。

The coking coal winnowing and moisture control technology was used to select and classify the blended coals.And the effects of the particle size distribution and moisture of the blended coals after grading by the coking coal winnowing and moisture control technique on the quality of coke were analyzed by coal sample test,bulk density test and 40 kg coking oven test.The coking coal samples were classified into grading and non-grading pulverization treatments,and selective screening and fineness adjustment were carried out based on the six types of particle size distribution.Considering selective screening and fineness adjustment,which was based on the screening pulverization and no-screening pulverization of coking coal samples,contrast tests of six kinds of coking coal samples were conducted.The results proved that after using the screening pulverization of winnowing and moisture control technique,the crush strength M40 of coke increased by 1.9%to 5.8%and the abrasion strength M10 improved by 0.1%to 0.3%.When the coal sample fineness enhanced from 73.0%to 84.0%,the crush strength of coke increased by2.4%to 4.1% and the abrasion strength improved by 0.5% to 0.7%.The bulk density of coke increased when screening off the fines whose diameter was less than 1 mm resulting in the improvement of the abrasion strength M10.The bulk density of coke increased with the decline of water content and tended to be stable when the water content in coal sample was greater than 8%.The nonlinear regression equations of the bulk density and moisture of the coal sample were given.The two-way analysis of variance of a medium diameter and coal sample moisture on the bulk density was carried out.The research results were beneficial to improving the existing coal winnowing and moisture control equipments.