Vacuum pumping system and use method thereof and vacuum refining system

Abstract

The invention relates to a vacuum pumping system, a vacuum refining system adopting the vacuum pumping system and a use method of the vacuum pumping system. The vacuum pumping system comprises a steamjet pump assembly sequentially connected in series through a pumping pipeline and a liquid ring pump, wherein the steam jet pump assembly comprises at least one grade of steam jet pump sequentially connected in series in the pumping direction and is further configured with at least one auxiliary pumping pipe used for preventing the steam jet pump from producing a laval nozzle effect; and at leastone auxiliary pumping pipe is connected to the side of the corresponding pumping pipeline between the steam jet pump and the former grade of steam jet pump, the outlet end of the auxiliary pumping pipe communicates with the liquid ring pump, and a control valve is arranged one each auxiliary pumping pipe. According to the vacuum pumping system provided by the embodiment, as the auxiliary pumpingpipe is adopted for dividing air flow entering the corresponding steam jet pump, the steam jet pump can be effectively prevented from producing the laval nozzle effect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a vacuum pumping system, a vacuum refining system using the vacuum pumping system and a method for using the vacuum pumping system. Background technique [0002] In recent years, the vacuum system of steam jet pump + liquid ring pump has begun to be applied in the field of molten steel vacuum, but there are many problems during use, including: [0003] (1) In the pre-pumping stage, each steam jet pump is not working, but it needs to be used as a gas channel. Since the steam jet pump is a Laval nozzle, when the pre-pumping gas flows through the pump chamber and the pressure difference between the two ends of the pump chamber reaches 1.5 The Laval nozzle effect is satisfied when the pump body is twice or more, so in the pre-pumping stage, the jet pump body, especially the jet pump body set at the rear, is prone to produce the Laval nozzle effect, which will affect the vacuuming in ...

AI Technical Summary

Problems solved by technology

[0003] (1) In the pre-pumping stage, each steam jet pump is not working, but it needs to be used as a gas channel. Since the steam jet pump is a Laval nozzle, when the pre-pumping gas flows through the pump chamber and the pressure difference between the two ends of the pump chamber reaches 1.5 The Laval nozzle effect is satisfied when the pump body is twice or more, so in the pre-pumping stage, the jet pump body, especially the jet pump body set at the rear, is prone to produce the Laval nozzle effect, which will affect the vacuuming in the pre-pumping stage efficiency;

[0004] (2) The selection of the pumping capacity of the liquid ring vacuum pump is too large;

[0005] (3) Liquid ring vacuum pump working fluid replenishment is too large, etc.

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