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The Application of Thin-walled Steel Silo in Grain Storage

There are three kinds of storage forms for raw materials in grain enterprises: the brick warehouse storage, thin-walled steel silo storage and reinforced concrete silo storage. With the development of industry, the thin-walled steel silo and the reinforced concrete silo have become the first choice of different large and medium sized grain enterprises. While, compared with the concrete silo, the thin-walled steel silo has more advantages and is more popular in customers. Therefore the following emphasis will on the introduction of thin-walled steel silos.
In the early stage after the thin-walled steel silos appeared on the market, because of their thin wall (0.4-1 mm), large temperature difference between inside and outside of the silos, condensation, and poor sealing, people have doubts about their security of grain storage. At the same time, the service life of their thin steel plate is also controversial. While, in the practice of more than ten years, people have gradually recognized its advantages, studied the methods to solve the above problems, and determine its application status in the silo.

Safe Storage of Grain

In the process of grain storage by using thin-walled steel silos, as long as we manage properly, the quality of grain will not be affected.
Grain water content is a very important safety influencing factor. We should strictly control the moisture content after grains are stored in the silo, which generally does not exceed 13%. If the moisture content exceeds 13.5%, we should reduce temperature and precipitation through mechanical ventilation.
As to the heat insulation, although the external temperature is easy to be introduced because of the thin wall of the silo, the grain is a good insulator. The grain temperature changes only within 300 mm from the wall, and at the same time, it absorbs and dissipates heat quickly. On sunny days, the highest temperature usually occurs at 3 p.m., but it basically returns to its original state at 7 p.m. In general, we will install a temperature measuring device in the granary, so it can be very convenient to test in the control room. Once the grain temperature changes, it can be dealt with appropriately.
The steel silo roof is easily affected by the outside world. So the temperature difference is very large and the moisture condensation occurs frequently. Therefore, it is necessary to install the exhaust pipe and axial fan on the top of the silo to avoid this phenomenon. In addition, install a mechanical ventilation device, lay ventilation pipeline and use mobile wind machine at the bottom of the silo are also effective measures for safe grain storage. At present, we have developed a movable cooling and ventilation device, which can make grain stored at a low temperature of 5-15 ℃. The effect is very good. The storage temperature can be maintained between 5 ~15 ℃ according to actual needs, and the power consumption is 4~6 ℃/t. After mastering the grain ventilation technology, combined with some existing grain processing technologies such as cleaning, screening, grading, dust removal, and a set of mature and complete methods in management, such as automatic grain turnover system in the silo and other methods, the thin-walled steel silo can safely store grain.

Materials

With the rapid development of iron and steel industry, the output, quality and variety of steel can meet the requirements of silo construction. At present, the raw materials used in steel silo are black steel plate, galvanized steel plate, aluminium plate, aluminium-steel plate, composite steel plate, plastic-coated steel plate, glass-coated plate, enameled steel plate, stainless steel plate, etc., which can adapt to the storage of different materials and meet the requirements of their storage time and service life.

Service Life

In the past, people only considered the physical service life of silos, not the technical service life. Nowadays people's thinking is changing. The life span of silos varies according to their uses, locations and needs, generally between 20 and 50 years. Thin-walled steel silo can meet the needs of technical service life. In large and medium-sized cities, due to planning changes, grain silos in the city need to be demolished. Some concrete silos are destroyed and scrapped. If we use assembled steel silos, they can be easily demolished without being destroyed.
In order to prolong the service life of thin-walled steel silos and make the service life reach more than 20 years, we find that using standard materials and double-sided galvanizing heat treatment or other coating treatment on the surface of steel plates will meet the requirements. In addition, pressing galvanized plates into corrugated shape can greatly enhance its strength and make the steel silo firm and durable.
FLYER Company has rich experience in the design and construction of modern large spiral steel silo. We can effectively solve complex problems in silo construction and use. If you have any problems or requirements, please contact with us freely. We will provide you with relevant specified information and help you to solve them. Expect to set up sincerely friendship with you!
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