Flue gas quenching dust removal device for inhibiting dioxin regeneration and control method

Abstract

The invention belongs to the field of electric arc furnace flue gas dioxin inhibition and flue gas dust removal, and relates to a flue gas quenching dust removal device for inhibiting dioxin regeneration and a control method. The device comprises a water-cooling cyclone separator, a mixed air cooler, a bag-type dust remover and a chimney which are arranged in sequence; one end of an outlet of thebag-type dust collector is connected with the chimney, and the other end is connected with the mixed air cooler through a circulating flue; and an air mixing fan is arranged in the mixed air cooler. According to the device, the heat exchange efficiency is high, and dioxin resynthesis is effectively inhibited; the problems of sewage treatment, pipeline blockage, dust removal cloth bag pasting and the like cannot be caused; flue gas mixing cooling instead of air mixing cooling is utilized, so that the problems caused by secondary combustion of flue gas can be effectively avoided; and dust removal equipment in the system can realize dust removal and purification of the flue gas in the circulation process, so that the flue gas reaches the emission standard.

Description

technical field [0001] The invention belongs to the fields of electric arc furnace flue gas dioxin suppression and flue gas dust removal, and relates to a flue gas quenching and dust removal device and a control method for suppressing dioxin regeneration. Background technique [0002] Electric arc furnace steelmaking has the characteristics of short process and energy saving. With the continuous growth of scrap steel in my country and the adjustment of national industrial structure, "short process" electric arc furnace steelmaking will gradually replace part of "long process" converter steelmaking. However, in the process of electric arc furnace steelmaking, plastics, paints and other chlorine-containing organic substances are attached to waste steel raw materials, which will decompose and burn into dioxins at high temperatures. Such substances are acutely lethal, highly carcinogenic, and teratogenic etc., capable of causing extensive and long-term harm to any animal. On th...

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Problems solved by technology

The traditional water-wall heat exchange cooling method has low heat transfer efficiency, high-temperature flue gas stays in the resynthesis temperature window for a long time, and has poor inhibition on the synthesis of dioxins

The traditional method of directly spraying water to cool down will produce more sewage, and sewage treatment is very troublesome, and direct water spraying will cause the moisture content of the flue gas to rise sharply. After the dust and water in the flue gas are mixed, it is easy to cause pipe blockage or dust bag The problem of "sticky bag"; the mixing of flue gas and air can achieve the effect of cooling, but the oxygen in the air will react with the residual carbon powder or carbon monoxide in the flue gas, resulting in secondary combustion or explosion, which not only affects the cooling effect of mixing, more safety hazards

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