基于地表水源热泵尾水排放的江河热环境容量研究

运用FLUENT软件对重庆市洪崖洞水源热泵系统尾水排入受纳水域的过程进行二维数值模拟,选取FLUENT中非耦合、隐式求解器对模型内的定常流动进行求解,得出受纳水域受水源热泵系统温排水影响后的温度梯度和温升面积。在温排水流量为4 500 m3/h、温差为6℃的条件下,得出受纳水域温升值超过1℃的水域面积约为1 600 m2,为模拟江河水域面积的2.0%。选取1℃温升值作为温升带边界控制值,在热泵系统最大负荷工况下,计算得出受纳水域的热环境容量为312.5(m.3℃)/s,剩余热环境容量为306.25(m.3℃)/s。根据地表水环境质量标准,该工程温排水量小于受纳水域的热承载力,不会对受纳水域生态环境造成热污染。

Environmental Heat Capacity of River Received the Tail Water of Surface Water Resource Heat Pump

Public hydrodynamic FLUENT software was used to make two dimensional numerical simulation on the process of tail water discharged into the received water of water resource heat pump of Hongya Hole in Chongqing,the steady flow process in the model by using uncoupled implicit solvers was studied,and the temperature rising area and temperature grads of the influencing source were obtained.As the flow of thermal discharge was 4 500 m3/h and temperature difference was 6 ℃,it showed that water area was 1 600 m2 if temperature of water rose 1 ℃,which was 2.0% of simulation river acreage area.Boundary value control of temperature rising area with one degree was intercalated,in the condition of mostly polluted,environment heat capacity was 312.5(m3·℃)/s,furthermore the residual environmental heat capacity was 306.25(m3·℃)/s.According to water environment quality standard,capacity of thermal discharge was under the received water,and there was no thermal pollution to ecological environment of the received water.