A method of operating a vacuum system with a pre-extraction device

Abstract

The invention relates to a vacuum-pumping system with a pre-drainage device and an operation method, and belongs to the technical field of smelting in a metallurgical industry. The technical scheme is as follows: a pre-drainage device (3 ) is arranged between a coarse filter module (2) and a fine filter module (4), and comprises a valve A (8), a branch pipeline (9), a valve B (10) and a tank body (11); the valve A (8) is arranged on a main pipeline (7) between the coarse filter module (2) and the fine filter module (4); the branch pipeline (9) is arranged on the main pipeline (7) between the valve A (8) and the coarse filter module (2); the branch pipeline (9) is connected with the tank body (11); the valve B (10) is arranged between the branch pipeline (9) and the tank body (11). The vacuum-pumping system has the beneficial effects that the pre-drainage time of 67pa of atmosphere in a vacuum furnace is reduced; the temperature of molten steel is ensured; the temperature and the dust content of a mixed gas are reduced; the service life of the filler of the fine filter module is prolonged; the fault rate of a degassing module is reduced; the maintenance cost of the degassing module is also reduced.

Description

technical field [0001] The invention relates to an operation method of a vacuum system with a pre-extraction device, in particular to a vacuum degassing and vacuum smelting vacuum system and an operation method thereof, belonging to the technical field of smelting in the metallurgical industry. Background technique [0002] The mixed gas with high temperature and high dust content in the traditional vacuum furnace (composed of argon, carbon monoxide, smoke and dust released from molten steel and refractory materials, leaked air, etc.) passes through the vacuum opening and closing module, coarse filtration module and fine filtration module. , and then enter the degassing module to be discharged into the atmosphere. This traditional vacuum system has the following disadvantages: the high-temperature mixed gas attenuates the life of the filter material of the fine filter module; the high temperature of the mixed gas expands continuously under vacuum, which requires an increase ...

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Problems solved by technology

This traditional vacuum system has the following disadvantages: the high-temperature mixed gas attenuates the life of the filter material of the fine filter module; the high temperature of the mixed gas expands continuously under vacuum, which requires an increase in the capacity of the degassing module and increases equipment investment; the dust content is large The mixed gas increases the dust content of the fine filter module, and the load effect is poor. The degassing module operates in an environment with excessive dust content for a long time, resulting in an increase in failure rate and increased maintenance costs; it takes a long time to pump the vacuum furnace to the rated vacuum degree. , resulting in a large temperature drop of molten steel, affecting the subsequent pouring effect

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