堆肥余热辅热养殖水体的仿真与试验

Experiment and simulation of aquaculture water with compost waste heat and auxiliary heat

为考察猪粪好氧堆肥余热辅热养殖水体的热量传递和温度变化规律,搭建了以发酵箱、储水箱和模拟鱼池为主体的小型试验装置,使用计算流体力学软件,建立试验装置几何模型,研究模型的热量传递和温度变化,并利用小型试验装置开展验证试验。试验结果显示:试验周期内,102.9 kg猪粪堆体模拟温度平均上升17.53℃,实测温度平均上升14.94℃;25 kg储水箱模拟温度平均上升16.86℃,实测温度平均上升11.85℃;24 kg模拟鱼池模拟温度平均上升13.55℃,实测温度平均上升9.42℃。试验结果表明:猪粪好氧堆肥辅热养殖水体具有可行性,且温度变化的实测结果与模拟结果表现出较好的一致性,一定程度上验证了模型的可靠性。

The aquaculture of fry and some adult fish such as Chinese high-fin banded sharks has high requirements on water temperature,while long-term,high-power electric auxiliary heat regulation has high energy consumption.The use of pig manure aerobic compost to heat aquaculture water can help to regulate and maintain water temperature,save energy.In order to study the transfer of heat and the process of temperature change of aquaculture water with the waste heat and auxiliary heat from pig manure aerobic composting,a small experimental device with a fermentation tank,a water storage tank and a simulated fish pond as the main body was built.The geometric model of the experimental device was established by using computational fluid dynamics software.The transfer of heat and temperature changes of the model were studied as well.The validation test was carried out by using the small experimental device.During the experimental period,the simulated temperature of 102.9 kg pig manure compost increased by 17.53℃on average,while the measured temperature increased by 14.94℃on average.The simulated temperature of 25.0 kg water storage tank increased by 16.86℃on average,while the measured temperature increased by 11.85℃on average,with the average heat absorption of the water storage tank of 6.22×106 kJ per day.The simulated temperature of 24.0 kg fish pond increased by 13.55℃on average,while the measured temperature increased by 9.42℃on average,with the average heat absorption of the fish pond was 4.75×106 kJ per day.The results showed that the pig manure aerobic composting is feasible for heating the aquaculture water,and the measured and simulated results of temperature change is consistent,verifying the reliability of the model to a certain extent.The mathematical model and verification test provide data support and theoretical basis for heating the aquaculture water by utilizing the waste heat and auxiliary heat from compost.