Oxygen-enriched sintering flue gas circulation system and application thereof

Abstract

The invention relates to an oxygen-enriched sintering flue gas circulation system and application. The oxygen-enriched sintering flue gas circulation system involves a sintering machine, a first dustremover, a first fan, an oxygen adding system, a second dust remover, a second fan and a post-treatment unit; the oxygen adding system enables oxygen to be uniformly mixed with circulation flue gas, so that the stability of the sintering yield and the quality is ensured; and a detection unit detects the content of the oxygen in the circulation flue gas in real time, the adding amount of the oxygenis adjusted through a control unit, the content of the oxygen in the mixed flue gas is detected in real time, and the control unit adjusts a flow adjusting device according to the feedback to enablethe content of the oxygen in the circulation flue gas to be 18%-30%. According to the oxygen-enriched sintering flue gas circulation system, the oxygen adding system is simple in structure, the oxygenflow can be accurately and quickly adjusted, the defect that the circulation flue gas flow is reduced due to additionally-added annular cold waste gas or air is avoided, the flue gas circulation ratecan be increased to 60% at the highest, and the flue gas emission reduction effect is improved.

Description

technical field [0001] The invention relates to the field of industrial flue gas purification, relates to a sintering system, in particular to an oxygen-enriched sintering flue gas circulation system and its application. Background technique [0002] The sintering flue gas circulation is to supplement part of the flue gas generated in the sintering machine with oxygen-containing gas and then send it to the sintering bed for combustion to reduce the amount of flue gas in the sintering machine, realize hot air sintering, reduce pollutant emissions and improve the quality of sintered ore. The new technology of sintering flue gas process control has been developed. Nowadays, many sintering machines have implemented the sintering flue gas circulation process. The core of the technology is to balance the circulating flue gas volume and the oxygen content of the circulating flue gas. [0003] CN 108731486 A discloses a typical process flow of flue gas circulation, and specifically ...

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Problems solved by technology

[0007] The flue gas circulation processes involved in the technical solutions disclosed above all use the flue gas mixer to mix the annular cooling exhaust gas or air to supplement the oxygen content of the circulating oxygen. However, due to the low oxygen content of the original flue gas, a large amount of annular cooling exhaust gas or air needs to be supplemented. , to meet the oxygen demand necessary for fuel combustion in the sintering process, and the total amount of gas that can be absorbed by the sintering machine is limited, so a large supplementary gas volume will lead to a reduction in the amount of circulating flue gas, resulting in a reduction in flue gas emission reduction. Emission reduction effect becomes worse

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