Circulation injection method and system for preparing CO2 through converter gas

Abstract

The invention discloses a circulation injection method and system for preparing CO2 through converter gas and belongs to the technical field of converter gas resource utilization and CO2 purification preparation. The converter gas with the low N2 content and an oxidizing agent with the main components being O2 and CO2 are burnt in a closed burning device, burning heat is utilized through a heat exchange device, CO2-rich pure gas is obtained through purification treatment of the burning gas, can be used for purification and preparation of high-purity CO2 and can also be directly used as low-purity CO2, and the low-purity CO2 and the high-purity CO2 are circularly used for converter injection, converter sealing and preparation of oxidizing agents needed by gas burning. The method and system have the advantages that the converter gas with the low N2 content can be obtained, the gas produced through converter gas burning is circularly used, production and emission of nitric oxides are reduced, the low-purity CO2 is efficiently obtained and the high-purity CO2 is efficiently prepared with low cost.

Description

technical field [0001] The invention belongs to the resource utilization of converter gas and CO 2 The technical field of purification and preparation relates to a method of utilizing converter gas to prepare CO 2 And a method and system for circulating injection. Background technique [0002] During the converter steelmaking process, carbon in molten iron reacts violently with oxygen, producing a large amount of CO and a small amount of CO 2 , as the main component of converter gas. In order to enhance the stirring strength of the molten pool and speed up the metallurgical reaction, the converter usually blows N at the bottom. 2 and Ar gas, blown N 2 Most of the Ar gas and Ar gas enter the converter gas; during the process of converter dust removal and ventilation, a large amount of air is inhaled from the converter mouth, and a large amount of N in the air 2 The gas will directly enter the converter gas; in order to reduce air inhalation and prevent gas leakage, N 2 ...

AI Technical Summary

Problems solved by technology

However, most companies do not have CO 2 Air source, cannot use O 2 -CO 2 Hybrid Injection Steelmaking Process

[0006] Currently, CO 2 The main idea of ​​recovery and preparation is to use the tail gas of lime kiln or thermal power plant as raw material gas, but the CO in the tail gas of lime kiln or thermal power plant 2 The content is usually only 20~35%, CO 2 The content is relatively low, and there are many impurity components, resulting in CO 2 The cost of separation, purification and preparation has increased significantly

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