Low-temperature grain-storing integrative method

Abstract

The comprehensive low temperature grain storing technology is mainly utilizing natural low temperature. After the basic airtight performance for grain warehouse is reached, the roof of the grain warehouse is treated with heat reflecting paint to reduce solar heat radiation effect. During grain storage, circulatory flow units are used to utilize cool source in regulate the humidity and temperature of stored grains. Grains in certain low temperature state will have less life activity, and thus less loss and less aging.

Description

technical field [0001] The invention belongs to the technical field of grain temperature control in grain storage. Background technique [0002] The history of low-temperature grain storage is very long, and the methods to achieve low-temperature grain storage are generally natural low temperature, mechanical ventilation, low temperature supplemented by mechanical refrigeration, and mechanical refrigeration low temperature. Mechanical refrigeration and air-conditioning low-temperature grain storage has a history of about 40 to 50 years; at present, the technology of grain coolers has been widely used in Western Europe. The new storage warehouses in China generally adopt mechanical ventilation grain storage technology, mechanical refrigeration or air-conditioning low-temperature storage, which are mainly used to solve the problem of safe passage of rice, flour and other finished grains during summer. Since the granary is often affected by solar radiation and atmospheric temp...

AI Technical Summary

Problems solved by technology

[0003] 1. Rice husk, that is, rice bran, is cheap and easy to obtain. It is packaged or scattered on the upper part of the grain storage, with a thickness of about 50 cm. The main disadvantages are poor water repellency, strong hygroscopicity, easy to grow insects, mildew, and grain inspection. more troublesome

[0004] 2. Spray rigid polyurethane foam on the inner wall of the warehouse roof. Rigid polyurethane foam can be sprayed or poured into molding. Foams with different densities, strengths and heat resistance can also be prepared according to different requirements, suitable for rapid construction. But the price is high, the economy is poor, and when working on the roof of the warehouse, it is necessary to ensure that the inner surface of the roof is smooth and tidy, and there is no beam blocking

[0005] 3. Polystyrene foam insulation roof (suspended ceiling) structure, this material can be made into plates of different thicknesses according to needs, good heat insulation, small bulk density, certain water repellency, high compressive strength, no Insects and mildew, it can separate the roof from the warehouse, and form an air insulation layer above it, which further reduces the heat entering the warehouse due to the influence of outdoor temperature and solar radiation, and improves the heat insulation effect. The main disadvantage is that the construction is difficult Large, and need to build a new roof, the price is higher

There are many shortcomings in the above traditional heat insulation methods, which cannot or limit the use of new high and large flat warehouses and shallow round warehouses.

[0006] The application of solar heat reflective coatings was gradually researched and developed with the development of the aerospace industry. At present, the coatings are mainly used in large buildings abroad. In addition to their beautiful appearance, they can also reduce the heat transfer from the sun to the buildings. ; The United States has already applied it to grain turnover steel silos; domestically, this coating is mainly used on storage tanks and special pipelines in the chemical industry.

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