污泥热泵干燥速率及能耗的实验研究  

Experimental Study on Sludge Drying Rate And Energy Consumption

作　　者：张璧光[1] 李梁[1] 张振涛[2] 宗玉博[3] 方跃飞 

机构地区：[1]北京林业大学,北京100083 [2]南京林业大学,江苏南京210037 [3]北京建筑工程学院,北京100044 [4]江苏天雨环保集团有限公司,江苏扬州225268

出　　处：《干燥技术与设备》2007年第5期220-224,共5页

基　　金：国家发改委工业[2004]2169号项目资助。

摘　　要：利用小型热泵干燥试验台,对污泥干燥过程含水率、空气参数(温度、相对湿度)及热泵参数(制冷工质参数、排水量、能耗等)的变化进行了试验测试,并着重对干燥速率、能量回收率及影响因素进行了分析。试验显示,依靠外热源预热后,污泥干燥过程仅依靠热泵回收的排气余热供热,干燥箱内平均温度可达63℃,最高达71℃。干燥箱内温度的高低取决于受制冷工况影响的热泵供风温度。污泥干燥速率随空气温度升高和相对湿度的降低而增大,湿基含水率从42.6%到18.74%的平均干燥速率为0.123%/(m·min)。热泵干燥回收排气余热的节能效果显著,并随热泵排水量的增加而增大。平均能量回收率为39.1%,最大值为48.9%和最小值为23.6%,分别发生在热泵排水量最大和最小的阶段。Variation of moisture content, air parameters （temperature, relative humidity）, and parameters of heat pump （parameters of refrigerant, dehydration efficiency of heat-pump, and energy recycling rate ） were experimental studied on sludge drying with a minitype heat-pump dryer. Emphatically. The drying velocity, energy recycling rate and influencing factors were analyzed. The results showed that after preheated by exterior heat resource, temperature within kiln can averagely reach 63 ℃, the maximum temperature is 71 ℃ during sludge drying which the heat is recycled from heat pump only. Temperature within chamber depended on the temperature of air pass through the condenser of heat pump, which is influenced by state of refrigerant. Sludge drying velocity increases as the temperature of air rise and the relative humidity decrease. Average drying velocity during the MC range of 42.6%-18.74% is 0.123%/m. The result showed a great recycling effect, and energy recycling rate increase with the increase of discharge capacity. Average energy recycling rate is 39.1% ,the maximum and minimum value is 48.9% and 23.6%, respectively, which is corresponding to max and min discharge capacity stage respectively.

关 键 词：污泥热泵干燥 能量回收率 干燥速率 影响因素 

分 类 号：X703[环境科学与工程—环境工程] TQ051.5[化学工程]