Vacuum pumping system and its use method, vacuum refining system

A vacuum pumping system and vacuum pumping technology, applied in the field of metallurgy, can solve the problems of the Laval nozzle effect, the large selection of liquid ring vacuum pump pumping capacity, and the influence of vacuum pumping efficiency in the pre-pumping stage, so as to facilitate production maintenance and reduce The effect of energy consumption

Active Publication Date: 2019-07-05
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Vacuum pumping system and its use method, vacuum refining system
  • Vacuum pumping system and its use method, vacuum refining system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 , an embodiment of the present invention provides a vacuum pumping system, including a steam jet pump assembly and a liquid ring pump 13 connected in series through the pumping pipeline, and the steam jet pump assembly includes at least one stage of steam jet pump assembly connected in series along the pumping direction. The jet pump is also equipped with at least one auxiliary suction pipe (illustrated, not marked) for preventing the steam jet pump from producing the Laval nozzle effect, and each of the auxiliary suction pipes is connected to the corresponding steam jet pump On the suction pipe between the steam jet pump of the previous stage and its outlet end communicates with the liquid ring pump 13 , each of the auxiliary suction pipes is provided with a first control valve 7 . Generally, along the air extraction direction, the more rearward the steam jet pump is, the higher the possibility of producing the Laval nozzle effect is, and the above-men...

Embodiment 2

[0036] The embodiment of the present invention relates to a vacuum refining system, including a vacuum chamber 1 and a vacuum pumping subsystem connected to the pumping port of the vacuum chamber 1. The vacuum chamber 1 is used as a reaction place for molten steel. The vacuum pumping subsystem is preferably The specific structure of the vacuum pumping system provided in Embodiment 1 above will not be repeated here. Wherein, a main vacuum valve 2 is provided on the pumping pipeline between the vacuum chamber 1 and the first-stage steam jet pump 3 to control whether the pumping subsystem works.

Embodiment 3

[0038] The embodiment of the present invention describes the method of using the vacuum pumping system provided in the first embodiment above. During the use of the vacuum pumping system, it includes:

[0039] In the pre-pumping stage, each of the steam jet pumps is on standby and serves as a gas channel, each of the first control valves 7 is opened, and the liquid ring pump 13 is running to extract the original gas in the pumped container 1;

[0040] When gas is generated in the pumped container 1, each of the first control valves 7 is closed, and each of the steam jet pumps and the liquid ring pump 13 is in operation;

[0041] When gas generation in the pumped container 1 stops, each of the first control valves 7 is closed, and each of the steam jet pumps is sequentially stopped in sequence, and then the liquid ring pump 13 is stopped.

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10F04B41/06
CPCC21C7/10F04B41/06
Inventor 欧洪林许海虹李智成剑明王逸名
Owner WISDRI ENG & RES INC LTD
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