污泥-煤复合燃料的成型干化工艺研究

为实现污泥的能源化利用,采用成型干化工艺制备污泥-煤复合燃料,研究了不同污泥含水率,添加比例,冷压成型压力等因素对复合燃料成型的影响,以及不同温度条件下复合燃料的干化特点.结果表明较好的工艺条件为:污泥初始含水率60%~70%,成型时固含70%~80%.10~30MPa范围内成型压力对落下强度影响较小.制备得到的成型燃料的落下强度可达到采用商用黏结剂制备得到的型煤水平. 混合成型后的污泥复合燃料,和污泥相比明显有利于水分的扩散和挥发,可在室温及不高于100℃条件下可以得到快速干化,实现污泥脱水及能源化利用的目的.

The molding and drying characteristics of sludge-coal combined fuel

Sludge-coal combined fuel was produced through moulding-drying process in order to use sludge as fuel. The influence of initial water content, amount of addition of sewage sludge and moulding pressure on characteristics of combined fuel, and drying characteristics at different temperatures was studied. The results showed that, the optimization process conditions were: sludge initial moisture content 60%~70%, and 70%~80% of solid content in moulded sludge-coal. The drop shatter had been less influenced by moulding pressure at range of 10~30MPa. Combined fuel prepared from sludge had good strength of drop shatter, which was the same as commercial briquette level. Compared with sewage sludge, the moulded sludge-coal could be dried more easily and quickly at temperature of room or lower than 100℃. Thus, the rapid dehydration of sewage sludge as well as the use as a potential energy was achieved.