Integrated semi-dry purifying method for sintering flue gas

Abstract

The invention relates to an integrated semi-dry purifying method for sintering flue gas. The method is adopted to perform high-efficiency desulfuration, denitration, and dioxin and heavy metal removal on sintering flue gas, an oxidizing agent generating and distributing device is connected on a flue gas pipeline in front of an absorption reaction tower of a semi-dry desulfurization system, uniformly-sprayed oxidizing agents and NO in flue gas are fully reacted to oxidize NO in the flue gas into NO2, and then flue gas enters the absorption reaction tower to be reacted with absorbing agents to achieve the purposes of desulfuration, denitration and dioxin and heavy metal removal. Compared with the prior art, the method has the beneficial effects that firstly, the method is suitable for all the semi-dry sintering flue gas purifying systems and can achieve the purposes of desulfuration, denitration and dioxin and heavy metal removal of the sintering flue gas in an integrated manner; secondly, the structure is simple, the occupied area is small and the operation maintenance is convenient; thirdly, the spraying amount of the oxidizing agents, the reaction time and the removal efficiency are easy to control and adjust; fourthly the investment and the operating cost are reduced; fifthly, the method is suitable for new semi-dry desulfurization systems and the transformed systems of the existing desulfurization systems.

Description

technical field [0001] The invention relates to a sintering flue gas purification technology, in particular to an integrated semi-dry sintering flue gas purification method. Background technique [0002] After several years of hard work, the desulfurization technology of sintering flue gas in my country's iron and steel industry has gradually matured. In order to further control pollution and improve the environment, the national "Twelfth Five-Year Plan" clearly increased NOx as a binding indicator for emission reduction, and at the same time gradually carried out the treatment of dioxins and Purification treatment of heavy metals, so now some companies have begun to try to denitrify, remove dioxins, and remove heavy metals from sintering flue gas, or reserve locations for denitrification, dioxins, and heavy metals while desulfurizing sintering flue gas, so that Create favorable conditions for the implementation of comprehensive treatment of sintering flue gas in the future. ...

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Problems solved by technology

[0010] At present, domestic sintering flue gas desulfurization, denitration, dioxin removal, and heavy metal removal flue gas comprehensive treatment technologies are still in the exploratory stage. The existing technologies are all based on spray tower wet purification devices, and there is no sintering flue gas purification However, most of the flue gas desulfurization of sintering machines now adopts semi-dry desulfurization, and most of the sintering machines of iron and steel enterprises do not have special flue gas purification devices for denitrification, dioxin removal, and heavy metal removal

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