太阳能生物质互补清洁供热系统集成研究

Research on System Integration of Solar and Biomass Hybrid Heating

基于我国生物质利用和太阳能集热技术的实际情况及能量综合梯级利用思路,研究性提出一种新颖的太阳能生物质互补清洁供热系统。新系统将太阳能集成到生物质锅炉中,利用菲涅尔集热装置直接加热补给水产生工业蒸汽和真空管集热装置预热补给水,并兼顾生物质锅炉热力除氧热源,多余热量进入蓄热罐进行存储。新系统通过调节生物质锅炉颗粒燃料量,适应对外供热负荷变动和太阳能波动所带来的输入热量变化导致蒸汽量变化的工况。以河北沧州地区某供热量20 t/h的太阳能生物质互补供热系统为例,性能估算分析表明,太阳能输入能量份额为20.31%,太阳能年度等效利用小时数为74 d(1779 h),真空管集热系统的加热能力是补给水预热负荷的4.47倍。研究表明,合理的热力系统集成方式是提高太阳能热利用系统性能和降低工业蒸汽成本的关键所在。研究成果将为开创我国太阳能生物质互补供热新局面提供新思路。

Based on the actual condition of biomass thermal power plant and solar heat collection technology in China and method of synthetic cascade utilization of energy,a novel solar and biomass hybrid heating system is proposed.Solar thermal energy is integrated with biomass boiler,the Fresnel collector directly heats the make-up water to generate industri-al steam and the vacuum tube collector preheats the make-up water,and takes into account the biomass boiler thermal de-aerating heat source,and the excess heat enters the heat storage tank for storage.The novel system can meet the changes in steam quantity caused by changes in input heat caused by changes in external heating load and solar energy fluctuations through the regulation of pellet fuel quantity in biomass boilers.Taking the solar and biomass hybrid heating plant with a heating capacity of 20 t/h in Cangzhou,Hebei Province as an example,the performance estimation analysis shows that the share of solar input energy is 20.31%,and the annual equivalent utilization hours of solar energy is 74 d(1779 h).The heating capacity of the solar vacuum tube collector system is 4.47 times the preheating load of the make-up water.The stud-y shows that the key point to improve system performance and reduce the industrial steam cost is mainly due to choose right system integration mode.The results will supply new schemes and methods for the development of solar and biomass hybrid heating plant in China.