温室型太阳能污泥干燥研究

Greenhouse Sludge Dry Treatment

首先给出污泥处理的重要性并简介了现有处理方式的利弊,经过对比给出了一种温室型太阳能干燥的技术,并就这一技术的效能,利用能量平衡方程进行分析。分析表明,这种温室的全年太阳能利用率可达46%,对于北京的辐射条件,每年可得0.82t/m2除水量。其干燥能力在夏季远高于冬季,能量利用率夏季值亦优于冬季值。在设计温室时,排气温度、相对湿度和气流组织对干燥效果有很大影响,这些项需根据经济性进行优化。这种干燥方式有较好的经济效益和实用性,具有进一步深入研究的价值。

Firstly,the significance of dealing with sludge and the advantages and disadvantages of the existing approaches are briefly introduced.Then,a new technique of solar greenhouse drying sludge is recommended based on the comparison among these approaches.At last,the efficiency of this technique is got by the energy-balance equation.The heat transfer of sludge material,the heat change of sludge drying bed,the heat transfer of air flow and the heat loss through greenhouse envelope structure are set as energy destination.And the solar radiation is the energy source of this system.Then,when the destination is equal to the source,energy-balance equation comes up.From the calculation,conclusion is got as below：the annual solar energy efficiency of this greenhouse could reach a rate of 46%,and in the weather conditions of Beijing,it could be get about 0.82t/m2 of water removed.In summer,this greenhouse get more water removed rather than in winter through a same time.In addition,lower outlet temperature always results in higher ventilation,which may raise the cost.Besides,good airflow organization can achieve high outlet relative humidity,which will raise the water removed.Visibility,this approach benefits economy and is practical,which deserves deep study.