Effects of nitrogen concentration of controlled-atmosphere storage in large size horizontal warehouse with different airtightness levels
Nitrogen concentration of controlled-atmosphere storage was studied in large size horizontal warehouse with different airtightness levels.Daily-loss of nitrogen was evaluated.And the concentration of nitrogen inside the grain and blistered space covered with PVC sheeting was analyzed.The results showed that,the concentration of nitrogen follow exponential decay during fumigation in stored grain.In theoretical analysis,the average concentra-tion of nitrogen for the third-level airtightness warehouse may be difficult to reach 98%of the target concentration,but the one for the first-level was easy to reach the target concentration.For killing the grain storage pest to achieve the target concentration of 98%,pressure decay test for airtightness for controlled-atmosphere was recommended at least 300 s.The uniformity of nitrogen concentration for the third-level airtightness warehouse was from 0.980 8%to 0.996 6%.For 95%confidence interval,there were no significant differences for the concentration of nitrogen between inside the grain and blistered space covered with PVC sheeting.
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