环流熏蒸是四项储粮新技术中一项非常重要的内容,对促进熏蒸气体在粮堆内均匀分布、使磷化氢浓度较快达到有效浓度、提高杀虫效果、减轻劳动强度和节约费用等方面具有非常重要的作用。但是我们在应用过程中,如果进行全仓密闭环流熏蒸(粮面不压盖薄膜),存在仓房密闭性能差、保持有效浓度 Circumfluent fumigation is a very important part of the four new grain storage technologies. It promotes the uniform distribution of fumigant gas in the grain pens and enables the concentration of phosphine to reach the effective concentration quickly, which enhances the insecticidal effect, reduces the labor intensity and saves the cost Etc. has a very important role. However, in the process of application, if we conduct closed loop fumigation of whole warehouse (grain uncovered film), there is poor confinement performance of the warehouse and keep the effective concentration