| 摘要: |
| 本文通过实验研究的方法，对比分析了R32制冷剂在泄漏量为3.6 kg，不同泄漏位置时，R32气体在室内不同平面的浓度扩散规律，并通过典型平面首次达到可燃下限（LFL）的时间和可燃风险时间来分析室内的安全性影响。结果表明：随着泄漏位置高度的增加，制冷剂浓度扩散速率在沿高度方向上逐渐趋于一致，浓度上升速率和浓度下降速率分别保持在约0.5%/min和0.06%/min。当制冷剂气体从房间上部水平方向泄漏改变为垂直向下泄漏时，泄漏口附近平面处最大浓度及浓度扩散速率均减小约50%，可燃危险时间减少了约78%；房间下部的的可燃危险时间随泄漏位置高度的升高而逐渐增大。当泄漏位置位于房间上部和顶部时，房间底部区域最先达到LFL值，其余位置处泄漏口附近平面处最先达到LFL值。 |
| 关键词: 可燃制冷剂泄漏 浓度分布 可燃风险时间 安全性评价 |
| DOI： |
| 投稿时间：2021-09-26 修订日期：2022-01-20
|
| 基金项目: |
|
| Experimental Study on Concentration Distribution and Indoor Safety of R32 Refrigerant Leakage Location |
|
Jin Wufeng, Xue Tandong, Yuan Xiaoyong, Wang Zhiqiang
|
| (Tianjin University of Commerce, Tianjin Key Laboratory of Refrigeration Technology) |
| Abstract: |
| In this study, an experiment was conducted to compare and analyze the concentration diffusion law of R32 gas in different planes ofthe testedroom following leakage from different positions of 3.6 kg R32 refrigerant. The safety impact in the room when the lower flammable limit (LFL) was reached for the first time in typical planes was analyzed along with the flammable risk time. The results showed that when the height of the leak position increased, the concentration diffusion rate of refrigerant gradually converged along the height direction. The concentration increase and decrease rates remained at approximately 0.5%/min and 0.06%/min, respectively. When the refrigerant gas leaked horizontally from the upper part of the room, the maximum concentration and concentration diffusion rate at the plane near the leak was reduced by approximately 50%, with the flammable risk time reduced by approximately 78%. The flammable risk time at the lower part of the room increased gradually with the height of the leak location. When the leak was in the upper part of the room, the LFL value was reached first at the bottom of the room and then in the planesthat are close to the leaking position. |
| Key words: leakage of combustible refrigerant concentration distribution flammable risk time safety evaluation |
