Hypercoal制备热压型煤的试验研究

Experimental study on preparation of hot-pressed briquette by Hypercoal

粉煤成型工艺不仅可以解决粉煤利用效率低、环境污染严重的问题,还可以满足某些特定工业生产的原料准备要求。以无黏性的瘦煤为原料,以Hypercoal(HPC)作为黏结剂,利用自制的热压成型设备进行了热压型煤的试验研究,研究中考察了保温时间、温度和HPC添加量对热压型煤抗压强度的影响。研究结果发现:HPC在热压条件下可以显著提高型煤的抗压强度,在不添加HPC的情况下,型煤的抗压强度仅有38~70 N/个,在加入10%的HPC后,型煤的抗压强度可以达到148~227 N/个;当HPC添加量为15%,热压成型温度为400℃,保温时间为15 min时,以30 MPa的压力成型,可以制得抗压强度高达436 N/个的型煤;与糖蜜作为黏结剂制成的冷压型煤相比,热压型煤有着相近的抗压强度,因此,以HPC作为黏结剂制备热压型煤是完全可行的。

The pulverized coal forming process can not only solve the problem of low utilization efficiency of coal and serious pollution,but also meet the raw material preparation requirements of certain industrial production.The preparation of hot-pressed briquette was carried out by using self-made hot-pressing equipment with Hypercoal(HPC) as binder and non-sticky lean coal as raw material.The effects of holding time,temperature and the amount of HPC on the compressive strength of hot-pressed briquette were investigated. It was found that HPC can significantly improve the compressive strength of briquette under hot-pressing conditions.Without the addition of HPC,the compressive strength of briquette was only 38-70 N/s.However,the compressive strength of briquette can reach 148-227 N/s when the amount of HPC was 10%.A briquette was finally prepared with the compressive strength of 436 N/s,when the amount of HPC was 15%,the hot-pressing temperature was 400 ℃,the holding time was 15 min,and the forming pressure was30 MPa.Compared with the cold-pressed briquette with molasses as binder,the compressive strength of the hot-pressed briquette was similar.Therefore,it is entirely feasible to prepare the hot-pressed briquette with HPC as binder.