Vacuum degree regulating system for steam injection pump

Abstract

The invention relates to the technical field of liquid steel external refining, and in particular relates to a vacuum degree regulating system for a steam injection pump. The vacuum degree regulating system is characterized in that the system comprises a first booster pump, a second booster pump, a third booster pump, a first condenser, a first injection pump, a second injection pump, a first auxiliary injection pump, a second auxiliary injection pump, a first condenser, a second condenser and a third condenser, wherein the first booster pump, the second booster pump and the third booster pump are connected sequentially, and are finally connected with one end of the first condenser; the first condenser is respectively connected with the second condenser through the first injection pump and the first auxiliary injection pump; the second condenser is respectively connected with the third condenser through the second injection pump and the second auxiliary injection pump; and the first condenser and the third condenser are sequentially connected through a discharge duct, a pneumatic regulating valve, a pneumatic stop valve and an air intake pipe. Through the system, the consumption of various energy source media in the whole treating process is saved.

Description

technical field [0001] The invention relates to the technical field of molten steel refining outside the furnace, in particular to a vacuum adjustment system for a steam jet pump. Background technique [0002] The steam jet pump is RH (Molten Steel Vacuum Circulation Degassing Process, which was jointly developed by Ruhrstahl and Heraeus in 1959, taking the first letter of the company to call this process RH), VD (Vacuum decarburization), VOD (Vacuum oxygen decarburization) and other key equipment for vacuum refining, using steam jet vacuum pump system, its function is to pump the molten steel environment into a vacuum state, the highest can reach 67Pa; the existing known technology is: in the process of molten steel processing, the vacuum degree that can be maintained is guaranteed by the working capacity of the pumps at all levels, and cannot be adjusted. At the same time, due to the gas content of the steel made Different, that is, the workload of the vacuum pump is diff...

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Problems solved by technology

[0002] The steam jet pump is RH (Molten Steel Vacuum Circulation Degassing Process, which was jointly developed by Ruhrstahl and Heraeus in 1959, taking the first letter of the company to call this process RH), VD (Vacuum decarburization), VOD (Vacuum oxygen decarburization) and other key equipment for vacuum refining, using steam jet vacuum pump system, its function is to pump the molten steel environment into a vacuum state, the highest can reach 67Pa; the existing known technology is: in the process of molten steel processing, the vacuum degree that can be maintained is guaranteed by the working capacity of the pumps at all levels, and cannot be adjusted. At the same time, due to the gas content of the steel made Different, that is, the working load of the vacuum pump is different, and the vacuum pump cannot be accurately stabilized at the vacuum degree required by the process.

[0003] The disadvantage of no vacuum degree adjustment is: in some refining processes, such as oxygen blowing decarburization, vacuum feeding, etc., the most suitable vacuum degree is carried out at 10~20KPa, and when our auxiliary pump is fully activated, the vacuum degree is the highest It can reach about 5KPa, and the vacuum degree during processing will change due to the gas content in molten steel, circulating gas and various protective gases. If the above-mentioned refining process is carried out under this vacuum degree, the blown oxygen, The added small particles of alloy materials are sucked away by the vacuum pump, so more refining raw materials need to be added, which prolongs the time of vacuum refining and adversely affects the entire process; at the same time, due to the consumption of more oxygen and alloys, the product cost increase

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