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Analysis And Improvement Of The Factors Affecting The Unloading Rate Of Large Steel Silo

The unloading rate of the steel silo refers to the percentage of the material discharged from the steel silo and is also called the unloading rate. The unloading rate directly reflects the practical performance of the steel silo, and it is the main performance index of the steel silo. When the material condition of the steel silo deteriorated, the storage material of the storehouse was more and more, the increase of the material and the slowing of the discharging resulted in the decrease of the effective fluidization volume of the steel silo and the low unloading rate. The low unloading rate not only makes the steel silo play a good role in discharging, but also reduces the economic benefit of the steel silo.

Large-scale steel silo with pneumatic conveying method, material fluidity is the key to the normal discharge of steel silo. Material fluidity is subject to various influences. Long-term backlog of materials, material humidity, outside air moisture into the library, the bottom of the reservoir wet, as well as some of the improper operation of the material is to make the cause of poor fluidity.

The material tonnage is large, the material level is too high, so the material compactness increases, the bottom is under the storage pressure increase, the material tight engross bottom, the fluidization performance reduces. If the material is not activated for a long time, the material in the storehouse is crushed and the material is difficult to be produced. This kind of phenomenon generally occurs in the off-season of the material sale, at this time the material accumulation quantity is much larger than the sale quantity. In order to avoid material storage and compaction, steel silo users should use the external circulation pneumatic system to loosen the material at the bottom of the storehouse.

The water content of the powder material itself is high, which causes the material fluidization performance to decrease or fail. In this respect, the user should strictly control the storage of materials before the water content, to minimize the water content. The more dry the material, the better the fluidization activity, the more difficult the compaction.

In order to maximize moisture-proof effect, the Design Institute, Quality Department, Research Center, purchasing Department and Budget Department participated in the test of 16 samples of moisture-proof materials. These materials according to the proportion of components can be divided into two components, three components, according to the material used can be divided into paint, epoxy, mortar. The two components of the material moisture-proof effect is also relatively good, but the materials used in the basic materials for their own production manufacturers, taking into account the procurement and transport constraints, not adopted. Paint and mortar materials test moisture-proof effect is poor, not adopted. Taking into account the effects of moistureproof and economic applicability and other factors, through the various departments agreed, decided to use three components of epoxy materials, the specific groups are divided into: E44 pure epoxy +t31 curing agent + diluent (acetone). The three components of this kind of materials are common chemical materials, which are easy to be procured in the area of construction site, which is advantageous to save transportation time and reduce transportation risk. The construction of the moisture-proof waterproof material after the end of the bottom guide material cone cement surface, before the installation of the reservoir bottom flow bar. At present, in the construction of the steel Silo project is actively promoting the bottom moisture-proof measures, I believe that the future of the steel silo system play a positive role.


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