Converter flue gas purifying and waste heat recovering method

Abstract

The invention belongs to oxygen top-blown converter flue gas purifying and waste heat recovering process in metallurgical industry, and particularly relates to a converter flue gas purifying and wasteheat recovering method. The converter flue gas purifying and waste heat recovering method specifically comprises the following steps: (1) performing flow division on flue gas in advance; (2) performing carbon spraying treatment on the flue gas in a high temperature section; (3) before the flue gas enters a waste heat boiler, performing initial-effect dust removal first; (4) decreasing the temperature of the flue gas through waste heat recovering equipment; (5) cooling by adopting a quench cooler to prevent the flue gas from generating dioxin in a specific temperature section; (6) purifying the flue gas by using a bag-type dust collector; (7) enabling the flue gas to enter a coal gas air blower; and (8) before converter blowing is ended, when the flue gas waste heat and the CO concentration are not suitable for recovering, closing a stop valve, and switching the flue gas to a bypass system by a switching valve at a converter opening. The converter flue gas purifying and waste heat recovering method has the beneficial effects that a spark condition of coal gas explosion is eliminated; the safety is improved; the energy saving benefit of the system is obvious; the investment is reduced; the dust removal efficiency is high; and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the flue gas purification and waste heat recovery process of an oxygen top-blown converter in the metallurgical industry, and in particular relates to a converter flue gas purification and waste heat recovery method. Background technique [0002] In the existing converter flue gas purification and waste heat recovery methods, the heat recovered by the waste heat recovery system is only through the vaporization cooling flue to recover the waste heat above 900°C to generate steam, and the waste heat below 900°C has not been recycled; the flue gas purification uses The dry system has the problems of low safety, high equipment investment, and unstable dust emission concentration after purification; the wet system used for flue gas purification has the problems of high energy consumption, high water consumption, and low purification efficiency. Contents of the invention [0003] In order to make up for the defects of the prior art...

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Problems solved by technology

[0002] In the existing converter flue gas purification and waste heat recovery methods, the heat recovered by the waste heat recovery system is only through the vaporization cooling flue to recover the waste heat above 900°C to generate steam, and the waste heat below 900°C has not been recycled; the flue gas purification uses The dry system has low safety, high equipment investment, and unstable dust emission concentration after purification; the wet system used for flue gas purification has the problems of high energy consumption, high water consumption, and low purification efficiency

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