基于凝汽器热回收的地热梯级高效利用系统设计和效益分析

摘要

品位对口、梯级利用是热能利用的基本原则.针对中温地热资源的特点,结合市场需求,以实际工程为背景,介绍了采用地热水高温部分进行发电、低温部分直接供热、凝汽器热回收供热、尾水利用热泵供热的基于凝汽器热回收的地热梯级高效利用系统的优化设计和性能评价,并结合不同地热资源梯级利用方案对比,对投资和效益进行分析.结果表明,该方法可以在不影响供热能力的前提下生产高品位的电能,增加项目收益,同时环境效益显著.%Grade matching and cascade utilization are the basic principles of thermal energy utilization.According to the characteristics of medium temperature geothermal resources and the market demands,taking the actual project as an example,presents the optimum design and performance assessment of high efficient cascade utilization system of geothermal energy based on condenser heat recovery,using the high temperature geothermal power generation,the low temperature water heat supply,the condenser recovery heat supply and waste water-source heat pump heat supply.Analyses the investments and benefits of different cascade utilization methods.The results show that this method can produce high grade electric energy without negatively impacting on heating capacity.Meanwhile,economic and environmental benefits can be improved.