高静压粉煤成型条件对制备型焦质量的影响OA

Using high static pressure pulverized coal molding technology to make pulverized coal into a high-density briquette for coking can expand the source of coking coals,reduce the use of strongly caking coal and lower the cost of coke production.Taking coke reactivity index(PRI),coke strength after reaction(PSR)and cold strength as the main quality indices,the effects of moisture,coal fineness and molding pressure on the quality of formed coke during pulverized coal molding were investigated using the aforementioned molding techniques.It is found that under the same coal blend-ing scheme,when the forming pressure is 15 MPa and fineness is 73%,PRI first decreases and then increases with increasing moisture in the range of 6%‒14%,reaching a minimum at 8%moisture.PSR and cold strength both increase initially and then decrease with increasing moisture,with maxi-mum values obtained at 8%moisture.In the same coal blending scheme,when the molding pressure is 10 MPa and the moisture is 8%,PRI first decreases and then increases as the coal fineness increases from 53%to 93%,reaching a minimum at a fineness of 73%.PSR exhibits an opposite trend,increasing first and then decreasing,with a maximum at a fineness of 83%,while the cold strength of the formed coke shows a similar trend.In six different coal blending schemes,at a mois-ture of 8%and a fineness of 83%,the PRI of coke decreases first and then increases with increasing forming pressure in the range of 0.1 MPa‒40 MPa,reaching a minimum at 30 MPa.PSR shows the opposite trend and reaches a maximum at 30 MPa,whereas the cold strength of coke continuously increases with forming pressure.The variation in coke strength with forming pressure is discussed in terms of briquette density,coke porosity and crystallite parameters.