Low energy consumption sintering flue gas dioxin emission-reducing system and method thereof

Abstract

The invention relates to a low energy consumption sintering flue gas dioxin emission-reducing system and a method thereof. The system comprises a main flue exhaust pipeline, a main dust remover, an air blower, a dioxin desorption system, a closed gas hood, a high dioxin compound flue gas flue, a circulating air pipeline, a dioxin compound desorption flue, a bypass flue, a dust remover, the other air blower, a desulfurizing tower and a chimney. A low-concentration area exhaust box is connected with the main flue exhaust pipeline, passes through the main dust remover, the air blower and the desulfurizing tower in sequence to reach the chimney, and then the flue gas is exhausted to the air. The closed gas hood covers above a sintering machine board trolley; one end of the high dioxin compound flue gas flue is connected with a high-concentration area exhaust box; and the other end of the high dioxin compound flue gas flue is connected with the dioxin compound desorption flue and the main dust remover of the main flue exhaust pipeline. The method comprises the steps of collecting flue gas, removing dioxin in the flue gas, removing dust, desulfurizing, exhausting to the air and the like. The invention greatly reduces the flue gas to be purified and treated, reduces the construction investment and the operation cost, and is beneficial to reducing the emission of various pollutants in sintering flue gas.

Description

technical field [0001] The present invention relates to the emission reduction of dioxins in the sintering process in the field of metallurgy and the waste heat recovery and utilization of sintering machine flue gas, in particular to a low-energy sintering flue gas dioxin emission reduction system in the iron and steel industry sintering process and its method. Background technique [0002] The "Stockholm Convention on Persistent Organic Pollutants" has officially entered into force for my country on November 11, 2004. Dioxin is one of the three persistent organic pollutants (POPs) that are unintentionally produced and discharged from anthropogenic sources in Annex C of the Convention. one. According to the provisions of Article 5 of the Convention, the parties to the Convention need to adopt the best available technology / best environmental practice (BAT / BEP) emission reduction action plan for the POPs in Annex C within two years from the date of entry into force. It will b...

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Problems solved by technology

[0006] For the PCDD / F produced by the sintering machine, there are basically no special treatment measures in China, and most of them use dust removal, desulfurization, etc. to remove part of the PCDD / F

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