Vacuum degasification system steam jet and last stage pressure air injection vacuum technology

Abstract

The invention relates to a vacuum process of steam injection and final pressure air injection of a vacuum degassing system, which adopts the following vacuum process flow: RH vacuum smelting of exhaust gas by a circulation vacuum degassing method, main vacuum valve, gas cooler, primary SE1 steam injection vacuum pump, secondary SE2 steam injection vacuum pump, primary C1 condenser, tertiary SE3a steam injection vacuum pump, tertiary SE3b steam injection vacuum pump and tertiary SE3c steam injection vacuum pump and secondary C2 condenser; and secondary C2 condenser, quartus SE4a pressure air injection vacuum pump and quartus SE4b pressure air injection vacuum pump, atmospheric emission buffer tank and atmospheric emission. According to the vacuum process flow, steam injection vacuum pumps and final pressure air injection vacuum pumps are adopted, and the vacuum system adopts dynamic vacuum pumps and does not adopt mechanical positive displacement pumps; final pumps adopt pressure air with low price; and the vacuum system has advantages in the aspects of equipment number, land occupation, investment, operation reliability, maintenance and overhaul and the like.

Description

technical field [0001] The invention relates to a vacuum degassing system in the metallurgical industry, in particular to a vacuum process flow of a steam jet vacuum pump plus an air jet vacuum pump at the final stage of pressure in a vacuum degassing smelting process. Background technique [0002] Steam jet vacuum pump is an essential equipment for vacuum degassing smelting process in metallurgical industry. The existing steam jet vacuum degassing usually adopts a mature full steam jet vacuum pump, but because the full steam jet vacuum pump consumes a large amount of steam, in order to reduce the energy consumption of the full steam jet vacuum pump, the full steam jet vacuum pump uses a steam jet pump plus the final stage The vacuum smelting process of water ring pump has been gradually applied in engineering. [0003] The following is a brief introduction to the vacuum smelting process of the steam jet pump plus the final water ring pump. [0004] Vacuum circulation dega...

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Problems solved by technology

[0021] (3) The power consumption of the system increases, especially when the water ring pump is not vacuumed, the water ring pump needs to run at low load for a long time

[0022] (4) There are equipment mechanical wear and shaft seal leakage in the operation of the water ring pump, which affects the final vacuum degree

[0023] (5) The cost of maintenance and repair of water ring pump system equipment is high. Due to the increase in the variety of system equipment, production and maintenance costs have increased

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