改质沥青对冶金炼焦过程单种煤成焦性质的影响

 针对宣化钢铁公司焦化厂所用的种煤，分别研究改质沥青的加入量，对灰分Ad、挥发分Vdaf、硫分St,d、收缩指数X和煤粘结指数G等主要成焦性能的影响。研究表明：加入改质沥青小于5％时，对瘦煤、1/3焦煤、焦2煤和弱粘煤的灰分、硫含量的影响不大，对弱粘煤、1/3焦煤和瘦煤的粘结指数没有明显的影响，对弱粘煤和瘦煤的胶质层厚度影响也不明显；随着改质沥青的加入，焦2煤和1/3焦煤的胶质层厚度显著增加，焦2煤的粘结性指数也显著增加。加入改质沥青大于5％时，随着改质沥青的加入，瘦煤和弱粘煤的灰分下降明显，焦2煤硫含量降低增大，瘦煤的胶质层厚度显著增加，弱粘煤、1/3焦煤和瘦煤的粘结指数有明显增加。加入改质沥青对各单种煤收缩指数影响规律较复杂，弱粘煤和1/3焦煤的收缩指数在配入3%改质沥青降到最小，以后又都明显增大，但改质沥青达到5%~6%后又减小；焦2煤和瘦煤在加入量小于5％时，收缩指数变化不大，加入量大于5％时才明显减少。

Influence of Adding Modified Coal Tar Pitch to Cokeability of Single Coal

For existing coking coal resources of Xuanhua I/S Group Co.， Ltd. coke oven plant of several kinds of single coal such as lean coal, 1/3 coking coal, slightly caking coal, and No.2 coking coal, the cokeability including ash content Ad, the volatiles Vdaf, the sulfur content St,d, the shrinkage index X, and the coal caking index G with addition of modified coal tar pitch was studied. The results show that the ash content and the sulfur content won’t change a lot when the quantity of the modified coal tar pitch added to the single coal was less than 5%, and won’t influence the coal caking indexes of slightly caking coal, 1/3 coking coal, and lean coal. The plastometer thickness of slight caking coal and lean coal were not influenced either. The plastometer thickness of No.2 coking coal and 1/3 coking coal increased dramatically by adding modified coal tar pitch, meanwhile, the coal caking indexes increased dramatically. The ash content of lean coal and slight caking coal decreased, the sulfur content of No.2 coking coal increased dramatically, the plastometer thickness of lean coal increased dramatically, the coking coal indexes of slight caking coal, 1/3 coking coal, and lean coal increased dramatically when the quantity of modified coal tar pitch increased. The relation of quantity of modified coal tar pitch and the shrinkage index of coal is very complex. The shrinkage index of slightly caking coal and 1/3 coking coal reduced to a minimum when modified coal tar pitch was 3%, and then increased as the modified coal tar pitch increased further. The coking coal index decreased again when the modified coal tar pitch was 5% 6%. The shrinkage index of No.2 coking coal and lean coal won’t have a big change when the quantity of modified coal tar pitch was less than 5%,until it increased to more than 5%.