抽灌同井季节性储能分析

Analyses of seasonal thermal energy storage for a pumping & recharging well

摘要:

为了探究抽灌同井季节性储能的可能性和潜力,采用经过现场试验验证过的数学模型对抽灌同井常年运行工况进行了数值模拟,并以抽回水温度为基础建立了季节性储能的定量分析模型.结果表明,由于热贯通的存在,前一个运行周期会对后面运行周期的抽水温度产生重大的影响,证实抽灌同井出现了明显的季节性储能现象.当负荷基本平衡时,逐年的抽水平均温度和储能比基本保持不变.对于北京地区夏冬运行模式,此时季节性储能提供了约73%的低位热量和24%的热汇.而当累积负荷不平衡时,热源井的抽水温度出现明显升高或降低,严重时使热源井失效.

Abstract:

Using the mathematical model validated by a field test,the perennial operation of pumping & recharging well(PRW) was simulated to explore the feasibility and potential of seasonal thermal energy storage(STES) of PRW.Meanwhile,a quantitative analysis model of STES was established based on the pumping and reinjection temperature.Results show that for the existence of thermal breakthrough,the operation of previous seasons has much effect on the temperature of pumping water in the later operation seasons.This behavior verifies that the PRW apparently has the phenomenon of STES.If the accumulated loads of space heating and cooling are kept in balance,the pumping temperature and the thermal energy storage ratio will basically remain unchanged.For a PRW in Beijing with summer-winter operation mode,the STES approximately provides 73% of low-temperature heat source and 24% of heat sink.However,if the accumulated loads are in unbalance,the pumping temperature will increase or reduce much annually and even the PRW may not work.