| 摘要: |
| 结合目前国内电厂循环水余热利用及褐煤干燥现状，提出了利用热泵技术回收电厂循环水余热干燥褐煤的实验方案，并搭建了实验系统。分别在60℃、 70℃、80℃条件下对褐煤进行了干燥实验，测定了褐煤质量随时间变化曲线。实验结果表明:干燥温度越高，干燥速率越快，有效干燥时间越长，干燥效果越好。在60℃的条件下脱水量为22.5%，耗时25min;70℃时为31%，耗时30min；80℃最高可达到42.6%，耗时35min。为热泵技术在循环水余热利用以及褐煤干燥中的实际应用提供参考。 |
| 关键词: 热泵 褐煤 干燥 余热利用 循环水 |
| DOI： |
| Received:August 06, 2012 |
| 基金项目: |
|
| Experimental Study on Drying Lignite by Heat Pump |
|
Sheng Wei1, Zheng Haikun1, Zhang Baosen1,2
|
| (1.College of mechanical and power engineering, Henan Polytechnic University;2.Haohua Yuhang chemical limited liability company) |
| Abstract: |
| An experimental scheme is proposed to recover the waste heat of power plant circulating water to dry lignite with heat pump, and the experiment system was developed. Experiments of drying lignite in the temperature of 60℃, 70℃and 80℃ were conducted, and the change of lignite quality with time was measured. The result shows that: the higher the temperature ,the faster drying rate; the longer the effective drying time ,the better the result. Drying 22.5% water at the temperature of 60℃ takes time 25 min; 30.5%-31.5% at 70℃takes 30 min; 42.6% at 80℃ takes 35 min. This paper provides a reference for the practical application of heat pump in the utilization of waste heat of circulating water for drying lignite. |
| Key words: heat pump lignite dry utilization of waste heat circulating water |
