循环风系统可以充分利用空气的再输运能力，减小实时排放总量，因节能减排特性成为工业通风的重要选择。但循环风系统控制环境内存在污染物蓄积现象，目前针对受控环境污染物蓄积及循环风比例的精确控制研究尚不完善。对此，本研究发展了循环风系统控制环境内污染物蓄积实时计算方法；基于铸造工业污染物散发的间歇性，提出了不同工艺条件下循环风比例计算方法，动态调节循环风比例范围。通过CFD离散相模型（DPM）对受控环境内的污染物时空分布进行了深入研究。结果表明，不同时刻模拟计算结果与理论计算值平均误差在15%以内，具有良好的一致性；循环风系统可以有效降低新风量和除尘系统实时排放总量；循环风系统控制环境内污染物蓄积存在浓度上限，上限值由污染源源强、循环风比例、除尘器对污染物的过滤效率计算确定。此外，通过受控环境内不同循环风比例下污染物浓度变化的动态特性，选取合适的循环风比例，在节能的基础上，对于减少循环风系统控制环境内污染物蓄积至关重要。

The circulating air system can make full use of the re-transportation capacity of the air and reduce the total real-time emissions, which has become an important choice for industrial ventilation due to its energy-saving and emission reduction characteristics. However, there is a phenomenon of pollutant accumulation in the controlled environment of the circulating air system, and the research on the precise control of the accumulation of pollutants in the controlled environment and the proportion of circulating air is not perfect. In this study, a real-time calculation method for controlling pollutant accumulation in the environment by circulating air system was developed. Based on the intermittency of pollutant emission in the foundry industry, a method for calculating the proportion of circulating air under different process conditions was proposed, and the proportion range of circulating air was dynamically adjusted. The spatiotemporal distribution of pollutants in a controlled environment was studied by CFD discrete phase model (DPM). The results show that the average error between the simulation results and the theoretical calculated values at different times is within 15%, which is in good agreement. The circulating air system can effectively reduce the fresh air volume and the total real-time emission of the dust removal system; The upper limit of the concentration of pollutants in the environment controlled by the circulating air system is determined by the calculation of the intensity of the pollution source, the proportion of circulating air, and the filtration efficiency of the dust collector. In addition, through the dynamic characteristics of pollutant concentration changes under different circulating air ratios in the controlled environment, it is very important to select the appropriate circulating air ratio, which is very important to reduce the pollutant accumulation in the environment controlled by the circulating air system on the basis of energy saving.

国家十三五重点研发计划项目(2018YFC0705305-5)；山西省基础研究计划(202203021212246)