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The use of infusion and oxygenation to fill carbon dioxide, due to the proportion of carbon dioxide gas is greater than oxygen, when the carbon dioxide into the lower part of the heap, the lower air gradually rises from the bottom, continue to vent from the upper part of the test chamber exhaust. When inflating, add a heating decompression device to the upper end of the carbon dioxide cylinder, and connect the outlet end of the decompression device to the intake valve at the lower part of the test chamber. Then open the intake valve on the cylinder and under the bin, open the vent valve in the upper part of the test bin, and slowly inject carbon dioxide into the grain heap. The flow rate is controlled around 0150kg #min. When the concentration of carbon dioxide in the upper part of the test chamber reaches 80% or more, the inflation is stopped and the valves at the air inlet and outlet are closed at the same time. After inflated, CO2 detector was used to detect the concentration of oxygen and carbon dioxide gas in the grain heap, and the gas concentration was detected every 6 hours thereafter. When the carbon dioxide gas concentration in the grain pile drops below 35%, the gas filling valve is opened again until the concentration reaches 60%. Keep the carbon dioxide gas concentration in the test chamber above 35% for 14 days, and then open the warehouse to check the insecticidal effect.
The detection results of the CO2 detector are very accurate. According to the analysis of the test results, it was found that in a warehouse with good air tightness, carbon dioxide gas control can eliminate 100% of the adults and eggs in the grain piles, and the natural growth in the grain piles. The pests of the two pests, Pirates and Maize, also died 100%. This test was carried out in a welded steel silo with good airtightness. Therefore, the carbon dioxide concentration decreased slowly and the insecticidal effect was particularly good. If carbon dioxide gas trapping is applied to a large-scale shallow silo or a large horizontal silo of a reinforced concrete structure, the amount of carbon dioxide must be appropriately increased while enhancing the tightness of the silo body. Since carbon dioxide is a non-polluting, non-residual gas, the use of carbon dioxide gas to prevent and control stored grain pests can not only achieve the desired insecticidal effect, but also can inhibit bacteria and mold, delay the deterioration of food quality, and treat the food without any residual poison. , has very significant economic and social benefits.
Carbon Dioxide Detector Analyzes the Effect of Carbon Dioxide Gas To Prevent and Control Pests in Stored Grains
In recent years, grain storage workers in many developed countries in the world have used carbon dioxide gas to adjust and control stored grain pests. This is because the use of chemical agents to control pests not only makes it easy to accumulate chemical residues in food, but also causes many stored grain pests to Insecticides produce resistance, which has become a worldwide problem. Therefore, in the practice of grain storage, it is urgently required to study the pest prevention and control techniques for stored grains that do not use or use less chemicals. This can be achieved by carbon dioxide gas storage. At present, major grain exporting countries such as Canada, Australia, and the United States, in order to ensure that the exported wheat meets the high standard of no live insects and no pollution, some of the organic foods are stored and exported at the time of carbon dioxide gas adjustment. It is of great significance to study the effect of carbon dioxide on the lethality of rice and rice bran. In this experiment, the rice elephants and pupa adults and eggs raised in the laboratory were used as the target, respectively, with different concentrations of carbon dioxide as the modified atmosphere, maintaining the corresponding concentration in the test chamber, treating for a certain period of time and checking the mortality, as carbon dioxide gas prevention and control The promotion and application provide theoretical parameters. The carbon dioxide detector is an instrument for detecting the concentration of carbon dioxide, and its role in the research process is indelible.