Air blower

Abstract

The present invention relates to an air-blower for converter flue gas, and it is formed from machine shell, blade wheel, rotor bearing box and seal device. Said machine shell is the plate ridge welded structure, the machine shell and air admission chamber are connected by means of common side plate, and said blade wheel adopts the double-layer sandwich gap type long and short blade form, in which the long blade, short blade, wheel cover and wheel disk are combined and welded into one body (called blade wheel), said blower fan adopts double-support F-type transmission, and two ends of main shaft are supported by bearing box. Said air-blower is high in efficiency and long is service life.

Description

technical field [0001] The invention belongs to the category of mechanical engineering, in particular to a blower used for converter flue gas. Background technique [0002] Converter steelmaking is the main process of steelmaking in the world today. The converter produces a large amount of CO, CO 2 , iron oxide powder and other high-temperature flue gas, whose flue gas emissions account for about 15% of the entire iron and steel enterprise. In order to prevent pollution and protect the environment, it is necessary to purify the converter flue gas and recover the gas. The converter gas blower is the key to the system equipment. After the converter gas is dedusted and purified by the OG method, its humidity is relatively high, and it contains a certain amount of viscous dust and a small amount of SO 2 , so it will cause wear and corrosion to the fan, and affect the service life; after the fan has been running for a period of time, the surface of the blade is easy to accumula...

AI Technical Summary

Problems solved by technology

After the converter gas is dedusted and purified by the OG method, its humidity is relatively high, and it contains a certain amount of viscous dust and a small amount of SO 2 , so it will cause wear and corrosion to the fan, and affect the service life; after the fan has been running for a period of time, the surface of the blade is easy to accumulate dust and scale, resulting in imbalance of the impeller, increased vibration, and has to stop production and manually clean the dust. It takes about 6 hours to clean the dust and change the rotor each time, and the output is reduced by about 900 tons (based on the 40-minute smelting cycle of the 100-ton converter). If the production is stopped and the dust is manually cleaned once a month, the annual production is reduced by 10,800 tons, and the pure profit of molten steel is 300. In terms of yuan / ton, the annual profit loss of a single furnace alone is 3.24 million yuan

The existing gas blower is mainly composed of casing, impeller, rotor, bearing box and sealing device. At present, most of them are turbine fans with cast iron structure, which are heavy in structure and low in efficiency. In recent years, they have also begun to use sheet metal welding structure for production. The advantages are Light weight (about 1 / 3 of the weight of cast iron structure), high strength and low cost, however, converter gas blower requires frequent high and low speed variable speed operation, due to alternating stress and fatigue impact load at the exit of the impeller, resulting in impeller fatigue damage, resulting There are problems in the production and operation of the fan; gas is flammable, explosive and harmful to the human body. Therefore, the seal of the shaft end of the blower is particularly important. Most of the domestic seals are sealed with a water jacket, which forms a water ring under the action of centrifugal force. Sealing effect; but the volume is large, the structure is complex, the installation is difficult, the extra load of the fan is increased, and water leakage often occurs; because the gas is flammable, explosive and toxic gas, it is very easy to explode under a certain concentration of open flame

Domestic gas fans only increase the gap between moving and static parts, and do not do enough in terms of explosion protection

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