water ring vacuum pump in steel plant vacuum degassing equipment

With the development of modern production and science and technology, not only the demand for steel production is growing rapidly, but also the demand for the quality of finished steel is becoming higher and higher.

At present, the status quo of traditional vacuum degassing equipment for molten steel is as follows:

1. The vacuum degree of the system usually can only reach 333.3 Pa;

2. The vacuum degree of the system rises slowly, which affects the quality of molten steel refining and increases the processing time, which can not meet the needs of continuous production. In order to ensure the normal operation of the steel vacuum degassing equipment, it is very important to reform the vacuum equipment used in the steel vacuum degassing equipment. This paper will introduce the application of water ring vacuum pump in the steel vacuum degassing equipment.

Application of water ring vacuum pump in vacuum degassing equipment of steel works

The vacuum degassing equipment for liquid steel requires large air volume, high vacuum degree and the characteristics of pumping from atmospheric pressure to 180? 100 mm Hg in a short time. In order to meet the requirements of vacuum degassing of molten steel, steam jet pump or mechanical pump is mainly used at present.

Mechanical pump will regularly increase and reduce the volume of its working chamber, and mechanically suction and discharge gas. The mechanical pump is suitable for medium and low vacuum range. Due to the low exhaust capacity of mechanical pump under medium vacuum, it is highly sensitive to dust, oil is easy to be polluted by condensed steam, and moving parts are easy to be damaged. Therefore, the mechanical pump is only used for small capacity steel vacuum degassing equipment.

At present, steam jet pump is widely used in the vacuum degassing equipment of molten steel. Compared with mechanical pump, it has the following advantages:

(1) It has a large suction under the vacuum degree required by the liquid steel vacuum processing.

(2) No large-scale dedusting system is needed to extract the dust containing gas.

(3) The structure is simple, the floor area is small, even does not occupy the production area, and is installed between the column spacing of the workshop.

(4) Since there are no moving parts, the operation is safe and reliable, and the maintenance is simple.

(3) The structure is simple, the floor area is small, even does not occupy the production area, and is installed between the column spacing of the workshop.

(4) Since there are no moving parts, the operation is safe and reliable, and the maintenance is simple.

(5) The steam and water supply equipment needed can be provided by the power grid of metallurgical plants or waste heat boilers.

(6) Generally speaking, because steam jet pump consumes a lot of steam and cooling water, its operation cost is very high, but considering the depreciation of fixed investment, its operation cost is not necessarily higher than that of mechanical pump.

The main components of the liquid steel vacuum degassing equipment are as follows:

1) Water vapor jet vacuum pump: mainly composed of multi-stage main and auxiliary pump bodies and multiple condensers. The pump body of each level consists of Laval nozzle, suction chamber and diffuser. The condenser is composed of cylinder, spray plate and cooling water pipe.

2) Vacuum lifting car, vacuum chamber and vacuum pipeline: the vacuum chamber is composed of a vacuum tank and a vacuum cover which can place the ladle. The vacuum pipe is connected to the steam jet pump at the tank side.

3) Water and steam system: bucket, steam bucket, soda water separator, etc.

4) Control part: PLC electrical control system and instrument control system.

In order to eliminate harmful gases and inclusions in steel and add beneficial components, people have made continuous efforts in various aspects. Using water ring vacuum pump technology to achieve this goal is an important aspect of this work.

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