Negative energy consumption dioxin emission reducing system of sintering machine and method thereof

Abstract

The invention relates to a negative energy consumption dioxin emission reducing system of sintering machine and a method thereof. The system comprises a main flue, a dust remover, a bypass flue, a circulating flue, a circulating fan and a circulating gas hood. A high-concentration area wind chamber is arranged in an area accounting for 55 to 95 percent of the length from a sintering machine head to a machine tail of a sintering machine trolley; a low-concentration area wind chamber is connected with the main flue to reach a flue sequentially from the dust remover, the fan and a desulfurizing tower so as to exhaust smoke into air; a circulating gas hood is covered above the sintering machine trolley; the high-concentration area wind chamber is connected with the circulating gas hood through the circulating flue; and the circulating flue is provided with the dust remover and the circulating fan. The method comprises the following steps of collecting the smoke, removing dust, mixing the smoke of the low-concentration area with the smoke of the high-concentration area to remove the dust, performing desulfuration on the smoke, exhausting the smoke into the air and the like. The system has the advantages of simple and convenient construction, installation, operation management and maintenance, shorter construction period, the negative cost operation for emission reduction of the dioxin, and obvious energy-conservation and emission-reduction effects.

Description

technical field [0001] The invention relates to the emission reduction of dioxins in the sintering process of the metallurgical industry and the recovery and utilization of waste heat of high-temperature flue gas from sintering machines, in particular to a dioxin emission reduction system with negative energy consumption for sintering machines in the sintering process of the iron and steel manufacturing industry and its method. Background technique [0002] Dioxins are the general term for polychlorinated dibenzodioxins and polychlorinated dibenzofurans. They are difficult to degrade and easy to bioaccumulate. They are the most carcinogenic substances that have been discovered so far. The International Center for Cancer Research has List it as a first-class human carcinogen. According to analysis, sintering dioxin emissions account for about 95% of the total emissions of the entire iron and steel industry; therefore, dioxin emission reduction in the iron and steel industry ...

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Problems solved by technology

[0003] At present, the existing dioxin emission reduction technologies mainly include methods such as rapid cooling, activated carbon adsorption, high-temperature oxidation, and catalytic decomposition, but the investment is large and the operating cost is high, and it is difficult to promote it on a large scale, and some methods are not suitable for sintering

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