为探索煤泥等劣质煤在大型燃煤机组的综合利用技术，深入了解超超临界燃煤机组中，蒸汽管回转干燥机-煤泥干燥系统的煤泥干燥特性及应用效果，进行了实验室静态试验和工业化试验。在温度150～200 ℃的静态条件下对50～150 mm大粒径煤泥团进行恒温干燥，分析了煤泥团粒度与干燥时间的关系，并利用全国首个超超临界燃煤机组中新建的蒸汽管回转干燥机-煤泥干燥系统（进料量25 t/h）进行工业化试验，探究了系统主要参数对煤泥干燥效果的影响，分析了系统热效率及能耗等重要指标。结果表明，在实验室静态试验条件下，粒径150 mm的煤泥团含水率从24%降至15%所需干燥时间超过50 min；煤泥团干燥过程经历预热快速干燥阶段（＜10 min）和稳定干燥阶段2个阶段，且随干燥温度升高，预热快速干燥阶段时长缩短。在工业化试验中，由于干燥机内煤泥存在解聚现象，相似条件下煤泥干燥时间较实验室结果略有缩短；随进料量增加，煤泥产品含水率将增大，当超过17%时，系统易堵料；汽源压力为0.35～0.80 MPa时，为利于煤泥干燥可适当降低进汽温度使其不超过195 ℃。另外，在试验运行条件下系统热效率可达到58.6%，平均处理1 t煤泥消耗0.112 t蒸汽及3.94 kWh电量。

In order to explore the comprehensive utilization technology of coal slime and other inferior coal in large coal-fired units and deeply understand the slime drying characteristics and application effect of steam tube rotary dryer slime drying system in ultra supercritical coal-fired units，the laboratory static tests and industrial tests were carried out. Under the static condition of 150-200 ℃，the 50-150 mm large particle size slime was dried at constant temperature. The relationship between slime particle size and drying time was analyzed. The industrial test was carried out by using a new steam rotary tube dryer-coal slime drying system(with a feed rate of 25 t/h）installed firstly in an ultra-supercritical coal-fired unit. The important indexes such as thermal efficiency and energy consumption of the system were analyzed. The results show that in the laboratory static test，it takes more than 50 min for the moisture content of coal slime mass(150 mm）decreasing from 24% to 15%. The coal slime mass drying process experiences two stages：preheating and rapid drying stage(＜10 min)，stable drying stage. With the increase of drying temperature，the period of preheating and rapid drying stage is shortened. In the industrial test，the drying time of coal slime was slightly shorter than the laboratory results under similar conditions，due to the depolymerization of coal slime in the dryer. With the increase of feed quantity，the moisture content of coal slime products increases. When it exceeds 17%，the system is prone to plugging. When the steam source pressure is 0.35-0.80 MPa，the inlet steam temperature should be reduced to less than 195 ℃，which is beneficial to coal slime drying. In addition，the thermal efficiency of the system can reach 58.6% under the condition of test operation，and it requires 0.112 t of steam and 3.94 kWh of electricity to produce 1 t of coal slime averagely.

0 引言

1 试验方法及内容

   1.1 实验室静态试验

   1.2 蒸汽管回转干燥机-煤泥干燥系统工业化试验

2 结果与讨论

   2.1 静态试验分析

   2.2 工业化试验结果分析

3 结论