High-nitrogen low-oxygen air control grain storage technology

Abstract

The invention provides a high-nitrogen low-oxygen air control grain storage technology, which comprises the steps of: A) using a mobile nitrogen generation unit to produce high purity nitrogen; and B) transporting high purity nitrogen into a granary. The granary bottom is provided with a circulation geosyncline, an air inlet pipe outside the granary is provided with a pressure regulating valve and is communicated with the circulation geosynclines, and the granary top is equipped with an air outlet and a detection port. The step B) specifically includes: B1) transporting high purity nitrogen into a mobile refrigeration dryer and cooling the nitrogen to a temperature equal to that inside the granary; B2) leading the high purity nitrogen into the granary through the circulation geosyncline, closing the air outlet, and detecting the pressure in the granary through the detection port; B3) when the air pressure in the granary is higher than that outside the granary by 300Pa, opening the air outlet; B4) adjusting the nitrogen transport pressure to 200-600Pa, and maintaining the pressure in the granary at 300Pa till the oxygen concentration in the granary falls to 5% ; and B5) closing the air outlet and pressure regulating valve, and removing equipment. The technology provided in the invention has the advantages of fast reduction of oxygen and low energy consumption, thus being very suitable for large shallow silos.

Description

technical field [0001] The invention relates to the technical field of grain storage, in particular to a controlled-atmosphere grain storage process for creating a low-oxygen grain storage environment through high-purity nitrogen. Background technique [0002] Nitrogen controlled atmosphere storage can not only delay the decline of grain quality, reduce the cost of rotation, reduce the labor cost of enterprises, but also provide green and environmentally friendly food to the society, which meets the needs of enterprise development, employee health, environmental safety and modern people's food safety needs. Nitrogen controlled atmosphere storage is a green grain storage model recommended and advocated by the State Grain Administration during the "Eleventh Five-Year Plan" period, which is in line with the overall goal of storage management under the new situation, and thus is the direction of future storage development and the trend of green grain storage in the future. It is...

AI Technical Summary

Problems solved by technology

The existing nitrogen controlled atmosphere storage process is very suitable for shallow circular storage with a small storage capacity, and can quickly and effectively reduce the oxygen concentration in small shallow storages. During storage, there are problems such as slow oxygen reduction, long time, and high energy consumption. It is difficult to reduce the oxygen concentration in large shallow round bins to 5%. Therefore, it is necessary to explore a nitrogen controlled atmosphere storage process suitable for large shallow round bins.

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