Annular rotary air supply device for coal storage Eurosilo

Abstract

The invention relates to an annular rotary air supply device for a coal storage Eurosilo. The annular rotary air supply device comprises a rotating air duct ring and a fixed air duct ring. The rotating air duct ring is fixedly connected with a center rotating platform of the Eurosilo through a second supporting frame, the fixed air duct ring is fixedly connected with a silo top trestle of the Eurosilo through a first supporting frame, and the rotating air duct ring and the fixed air duct ring are coaxially arranged with the rotating center axis of the Eurosilo. The rotating air duct ring is in seal connection with the fixed air duct ring through a sealing assembly, and an annular air duct is formed between the rotating air duct ring and the fixed air duct ring. The fixed air duct ring is provided with an air inlet pipe communicated with the annular air duct, the end of the air inlet pipe is connected with an air supply fan located outside the Eurosilo, and the rotating air duct ring is provided with an air outlet pipe communicated with the annular air duct. Compared with the prior art, the annular rotary air supply device for the coal storage Eurosilo is good in sealing performance, high in air supply efficiency and small in occupied space, the original structure and the operation process of the Eurosilo are not affected, and the air supply requirement at the rotary trestle is met.

Description

technical field [0001] The invention relates to a coal storage technology, in particular to an annular rotary air supply device for a coal storage euro bin. Background technique [0002] Euro storage coal is the latest environmentally friendly coal storage method in China. Because the coal types used in foreign Euro storage coal are quite different from those in China, the moisture content of foreign coal types is low, and the water vapor volatilized during coal storage is relatively high. Small, in the actual coal storage process, the water vapor concentration in the Euro warehouse is low, which will not affect the environment in the Euro warehouse, but the coal used in China is mainly lignite, and the proportion of coal powder particles is high, volatile and moisture Both are large and prone to spontaneous combustion. Therefore, a higher concentration of water vapor will be generated in the Euro warehouse for coal storage, and the higher concentration of water vapor will ...

AI Technical Summary

Problems solved by technology

[0002] Euro storage coal is the latest environmentally friendly coal storage method in China. Because the coal types used in foreign Euro storage coal are quite different from those in China, the moisture content of foreign coal types is low, and the water vapor volatilized during coal storage is relatively high. Small, in the actual coal storage process, the water vapor concentration in the Euro warehouse is low, which will not affect the environment in the Euro warehouse, but the coal used in China is mainly lignite, and the proportion of coal powder particles is high, volatile and moisture Both are large and prone to spontaneous combustion

Therefore, a higher concentration of water vapor will be generated in the Euro warehouse for coal storage, and the higher concentration of water vapor will condense into water droplets when encountering the equipment in the warehouse and the metal structure of the warehouse body, and then combine with the various coals released in the warehouse. After the gas is combined, various acidic corrosion substances are produced. When attached to the surface of the metal parts in the Euro warehouse, it will cause corrosion damage to these metal equipment, and then bring extremely adverse effects

In addition, at present, domestic power generation enterprises generally use coal with high volatile content and large volatile volume. When storing coal, coal volatilizes more methane and carbon monoxide. These combustible gases can easily cause various fires or Hazard to the personal safety of maintenance and operation personnel entering the warehouse

In order to prevent spontaneous combustion of coal, domestic power generation companies generally use nitrogen to prevent the oxidation reaction of coal, and release a large amount of nitrogen from the bottom of the Euro bin, so that the nitrogen can fill the gaps between coal particles, thereby isolating the oxygen around the coal, Avoid or reduce the possibility of coal oxidation reaction, but in this way, it is inevitable that part of the nitrogen seeps out from the coal accumulated in the warehouse, and is distributed into the space where the coal is not piled in the warehouse, which will also make the coal in the warehouse not piled up. The oxygen content in the coal space is reduced. When personnel need to enter the warehouse for equipment maintenance or operation, there will be a risk of suffocation due to the low oxygen concentration. In addition to conventional positive pressure respirators, other types of masks are often used by workers. It cannot effectively guarantee the normal breathing of personnel, but after wearing positive pressure respirators, it is inconvenient for operators to move and cannot meet the normal operation requirements

[0003] Although the Euro warehouse is equipped with an exhaust fan on the roof of the warehouse, the actual exhaust effect is not good, mainly because the various gases and water vapor generated mainly gather near the piled coal, that is, the area near the upper surface of the coal pile in the warehouse

The exhaust fan on the roof of the warehouse exhausts the gas from the area near the main exhaust fan, and the Euro warehouse is not a sealed container. There will always be air in many structural joints of the Euro warehouse, such as between the roof and the cylinder. There are various gaps, so that the gas can enter the bin, and then flow to the exhaust fan and be exhausted by the exhaust fan, because the flow of gas always occurs from the place with the least resistance, and the gas in the bin near the coal pile The relative flow of gas is very slow, especially when the height of the coal pile in the Euro warehouse is low, that is, the amount of coal stored is small, and when the distance between the surface of the coal pile and the exhaust fan is relatively long, the exhaust air of the top fan on the warehouse The ability to absorb gas near the surface of the coal pile is poor, so it takes at least 10 hours to replace the gas in the warehouse. In addition, if the exhaust volume of the exhaust fan is greater than the amount of air entering from the gap, It will only form negative pressure in the warehouse and cause unnecessary load on the roof of the warehouse, but it cannot effectively make the gas near the coal pile flow to the position near the roof of the warehouse, and cannot effectively exchange air, which will seriously restrict the movement of personnel. The timeliness of warehouse operation may bring hidden dangers to the safety of coal storage in Euro warehouse, which seriously affects the normal coal storage production and operation of Euro warehouse

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