Molten steel vacuum refining system based on mechanical pump group

Abstract

The invention discloses a molten steel vacuum refining system based on a mechanical pump group. The system comprises a vacuum tank, a deduster, a roots pump group and a pre-screw pump, wherein the roots pump group comprises a main roots pump, a first middle roots pump and a second middle roots pump; the deduster is also directly connected with the pre-screw pump through a pipeline; the bottom of the vacuum tank is connected with an argon system; the system also comprises a controller; the first middle roots pump, the second middle roots pump and the pre-screw pump are all electrically connected with the controller; the main roots pump is electrically connected with the controller through a frequency converter; a liquid level sensor is arranged at the upper part of the inner wall of a refining furnace of the vacuum tank; the liquid level sensor is electrically connected with the controller; a vacuum degree measuring device is mounted on a pipeline between the deduster and the main roots pump; and the vacuum degree measuring device is connected with the controller. The system disclosed by the invention can perform automatic control to realize stable liquid surface of the molten liquid in the refining furnace of the vacuum tank to prevent steel overflow, thereby avoiding production safety accident.

Description

technical field [0001] The invention relates to the field of vacuum refining of molten steel, in particular to a vacuum refining system of molten steel based on a mechanical pump group. Background technique [0002] In the field of metallurgical steelmaking, vacuuming is required for vacuum refining of molten steel. At present, Roots pumps of steam flow vacuum pumps are used for vacuuming. It is produced by the combustion of the boiler, and the water vapor is sprayed in the pipeline to form a jet gas. The jet gas passes through the upper mouth of the vacuum tank to take out the gas to complete the vacuum. The gas passing through the gas outlet of the system is a mixed gas, which includes water vapor, carbon monoxide, carbon dioxide and waste gas containing steel impurities, which pollutes the environment, and uses a steam flow vacuum pump, which requires water energy and heats the water The heat energy required is huge, the energy utilization rate of water vapor is low, and...

AI Technical Summary

Problems solved by technology

The gas passing through the gas outlet of the system is a mixed gas, which includes water vapor, carbon monoxide, carbon dioxide and waste gas containing steel impurities, which pollutes the environment, and uses a steam flow vacuum pump, which requires water energy and heats the water The heat energy required is huge, the energy utilization rate of water vapor is low, and the energy consumption is large

In order to solve the problems of large energy consumption and environmental pollution, the Chinese invention patent (application number 200710017438.0) discloses a vacuum refining system and method for molten steel, which solves the problems of large energy consumption and environmental pollution of the existing Roots pump set, but For the problems of excessive fluctuation of molten steel in the furnace during the steelmaking process, slag and steel overflow or production safety accidents caused by excessive vacuum in the furnace, no solution is given in the prior art

Images