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Vacuum Pump Unit System Technology

The vacuum pump unit system consists of four-stage parallel screw pumps and Roots pumps, including 10 ultra-high-flow Roots pumps, 10 high-flow Roots pumps, 7 high-flow and high-pressure Roots pumps, 7 dry vacuum screw pumps with automatic nitrogen purging function and automatic dust removal function. The filter vacuum pump unit determines the dry vacuum pump according to the process requirements and system gas flow rate. The pumping capacity of the unit system. The system of dry vacuum pump unit can operate in the pressure range and the working exhaust port can be connected with the atmosphere to continuously exhaust into the atmosphere. According to the metallurgical effect to be achieved, the pumping capacity of each stage pump and the pressure difference that can be withstood are calculated, and then the pump is selected and combined. The pumping capacity and installed capacity of each stage pump are different.


Through the combination of different levels of pumps to achieve the design requirements of the pumping capacity. The filter system of vacuum pump unit can reduce the smoke and dust in the treatment of steel water, reduce the pollution of smoke and dust to the environment. It is difficult to check the dust concentration of waste gas in the production process in vacuum environment. It is found that the mechanical obstruction of dry pump caused by dust particles combined with the operation mechanism design of dry pump is added in the on-line detection system to optimize the shutdown and purge procedure of dry vacuum pump unit system to solve the dust particles. Detection of granules in airtight environment and blocking problem of vacuum pump unit. The RH dry vacuum pump unit system of Baotou Iron and Steel Co. uses bag filter dry vacuum pump unit to manufacture very precisely, and the internal tolerance is very small. The exhaust gas entering the vacuum pump unit must be cooled to remove the dust completely. Otherwise, dust enters the pump system and seriously damages the pump body.

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Therefore, the filter and dust removal system is an essential key link for the dry vacuum pump unit system. The plant installed a gas cooler on the main pipe of RH furnace to reduce the exhaust temperature extracted from the vacuum tank. At the same time, the air cooler is also an inertial dust collector, which deposits the dust particles in the exhaust flow in the dust discharge chute below, and then the exhaust gas enters the bag filter working under vacuum conditions to reduce the exhaust temperature and remove part of the dust particles. Bag filters need some precautions when they work in vacuum. The filter design needs to be fully sealed to meet the rapid change of pressure from vacuum pressure to atmospheric pressure so as to prevent air leakage into the vacuum system.


In the process of vacuum refining, gas escapes from molten steel pool at low vacuum and a small amount of gasified metals are mainly zinc, magnesium and manganese with high vapor pressure at steelmaking temperature. On the way into the vacuum pump unit, the cooling parts of these metals in the vacuum system rise to form an attachment layer. After vacuum degassing, they open the vacuum degassing device and ignite immediately when exposed to air. After the degassing operation is completed, the filter bag must be cleaned up by nitrogen purging system of oxide layer. The cloth bag will be purged in vacuum to avoid ignition when air enters at the beginning of the next degassing cycle. The filter is cleaned automatically at the end of each vacuum treatment. When the vacuum pump unit is maintained at low pressure or the vacuum main valve is closed, nitrogen is supplied to the pulse jet cleaning valve to open the pulse jet operation procedure so as to avoid dust from a set of filter bags being washed down and attached to a group of adjacent bags.


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