Macro-control of grain is the main means to maintain national food security, and grain depot is the basis of macro-control of grain. Therefore,The intelligent control and precise management of grain depot is the key to realize safe and efficient grain storage.

Grain storage zui is mainly treated with insect removal. Aluminum phosphide is China's grain sector to promote the application of a very effective stored grain insecticide, widely used in granaries of stored grain insecticide when water or moisture absorption can be deliquescent ,Release of highly toxic phosphine gas. The laboratory technician of the grain depot will be exposed to phosphine gas when sampling and testing and the storekeeper entering the depot to measure the temperature, humidity and check the grain situation and insect situation. Some of them cause phosphine poisoning due to lack of safety and health knowledge.

In order to explore the concentration of phosphine in the granary during fumigation and the time after fumigation to below the national health standard, it is necessary to analyze the change of phosphine gas concentration in the warehouse after fumigation andO2、CO2Gas environment concentration monitoring ,To provide a scientific basis for the protection of personnel health. During fumigation, the concentration of phosphine in the warehouse and in the grain pile is very high, and the concentration of phosphine in the warehouse is very high.48hPeak,In the grain pile96hThe peak value was reached, and the phosphine concentration in the warehouse was much higher than that in the grain pile in the first two days. But as time goes on,The difference between the two becomes smaller and tends to be balanced, indicating that the phosphine produced by the deliquescence of aluminum phosphide quickly diffuses in the warehouse.,And gradually penetrate into the grain heap dispersion,The concentration of phosphine in the warehouse dropped to near the national health standard after two days of opening and venting. After the secondary closure of the warehouse, the concentration of phosphine in the grain pile gradually decreased.,However, the warehouse rose first and then fell, indicating that the phosphine in the grain pile was gradually released to the warehouse space after the second closure, causing the concentration in the warehouse to rise. Until No.9It was only when the concentration of phosphine in the Tianliang heap and barn fell below the national health standard. From the beginning of the opening of the warehouse after fumigation,It will be safer to enter the warehouse after about half a month.

On the basis of the existing digital temperature measurement, the grain situation measurement and control early warning module of the storage business management system should also integrate the automatic analysis functions of the detection of gas, humidity and insect pests in the grain pile, and the measured data should be written into the historical database to provide big data support for the accurate decision-making of scientific grain storage. On this basis, a grain situation expert decision-making system should be gradually established. When the grain situation changes abnormally, the alarm sent by the system will be directly notified to the mobile phone of the responsible person, and according to the ecological digital model of grain storage in the region, after comprehensive analysis by the system, the handling opinions will be recommend. It is even directly associated with intelligent ventilation, fumigation and insecticide, modified atmosphere storage and other equipment, and corresponding measures will be taken automatically after authorization to truly realize the perfect integration of "measurement" and "control. The model of the integrated monitoring system of the grain depot is shown in the following figure:

WeApolloCompany Agent of the United KingdomAlphasenseTwo-year conventional electrochemical principlephosphine sensor, Professional used in granary or industrial phosphine concentration monitoring and alarm. It has the characteristics of good stability, high sensitivity, fast response and high cost performance. At the same time also have10ppmSmall rangePH3-A1/B1and2000ppmLarge rangePH3-BERange optional.

The main performance parameters are as follows:

1.   Test range:0-10ppm（A1/B1）0-2000ppm（BE）

2.   Sensitivity:550~900nA/ppm(A1)；600~1000nA/ppm(B1)；15~35nA/ppm(BE)

3.   High resolution:0.03ppm(A1/B1)；2ppm（BE）

4.   T90 response time:A1/B1)；BE)

5.   Working environment:-30~50℃,10~90%RH