地热梯级开发与尾水余热回收的耦合设计分析
Coupling design analysis of geothermal cascade development and tail water waste heat recovery
摘要：
以天津市河西区郁江道地热井梯级利用项目为例,总结了HX-54及HX-54B双井开凿前水温、流量的预测方法。项目1期利用地热水对末端散热器系统进行供热,2期对比了HX-13尾水最大量余热利用、HX-54地热水最大开采量利用及HX-13尾水不同比例回灌3种设计方案,分析了方案的综合成本、节能效果及整体收益,得出了HX-13尾水余热利用量与综合成本的关系,并对如何促进尾水回灌给出了建议,为地热梯级利用的设计和应用提供了全面的实施路线及全新的思考方向。
Abstract：
Taking the geothermal well cascade utilization project on Yujiangdao, Hexi district, Tianjin as an example, this paper summarizes the prediction methods for water temperature and flow rate before the drilling of HX-54 and HX-54B twin wells. In phase 1 of the project, geothermal water is utilized to provide heat for the end radiator system. In phase 2, three design schemes are compared, namely the maximum waste heat utilization of HX-13 tail water, the maximum exploitation utilization of HX-54 geothermal water, and the different proportion reinjection of HX-13 tail water. The comprehensive cost, energy-saving effect, and overall benefits of these schemes are analysed, the relationship between the waste heat utilization amount of HX-13 tail water and the comprehensive cost is obtained, and the suggestions on how to promote tail water reinjection are provided, offering a comprehensive implementation route and a new thinking direction for the design and application of geothermal cascade utilization.
Keywords:geothermal well cascade utilization; tail water reinjection; waste heat utilization; comprehensive cost estimation; heating design