Method for deeply purifying flue gas of sintering machine and recycling waste heat of flue gas of sintering machine

Abstract

The invention discloses a method for deeply purifying flue gas of a sintering machine and recycling waste heat of the flue gas of the sintering machine which not only can eliminate harmful components in the flue gas generated by the sintering machine, but also can fully utilize heat contained in the flue gas. Flue gas generated by the sintering machine replaces cold air to serve as primary air and secondary air of a circulating fluidized bed boiler to be fed into a hearth for combustion supporting, and dioxin and CO fed into the flue gas are burnt off at the temperature of 900 DEG C in a hearth; the ultralow emission of SO2 and NOx is realized through limestone desulfurization and SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) denitration equipment in the circulating fluidized bed boiler device; and meanwhile, the temperature of flue gas generated by the sintering machine serving as primary air and secondary air reaches about 140 DEG C and is about 120 DEG C higher than that of cold air of a traditional circulating fluidized bed boiler. According to the technical scheme, heat of the flue gas exhausted by the sintering machine is fully utilized, investment of equipment of an air preheater is saved, and two purposes are achieved.

Description

technical field [0001] The invention relates to a sintering machine flue gas utilization device, in particular to a sintering machine flue gas deep purification and waste heat recovery utilization device and a utilization method thereof. Background technique [0002] The flue gas produced by the sintering machine used to process iron ore in the iron and steel industry contains dust, SO 2 , NO x , dioxin and CO, the existing treatment process for the harmful gas in the flue gas produced by the sintering machine is: through dust removal, desulfurization, denitrification and other environmental protection equipment, the dust, SO 2 , NO x After the removal, the treated flue gas is directly discharged into the atmosphere, but when the existing environmental protection equipment processes the flue gas generated by the sintering machine, dioxin and CO cannot be removed; dioxin is a kind of organic Chlorine compounds are highly toxic and carcinogenic; new toxicology and endocrino...

AI Technical Summary

Problems solved by technology

[0002] The flue gas produced by the sintering machine used to process iron ore in the iron and steel industry contains dust, SO 2 , NO x , dioxin and CO, the existing treatment process for the harmful gas in the flue gas produced by the sintering machine is: through dust removal, desulfurization, denitrification and other environmental protection equipment, the dust, SO 2 , NO x After the removal, the treated flue gas is directly discharged into the atmosphere, but when the existing environmental protection equipment processes the flue gas generated by the sintering machine, dioxin and CO cannot be removed; dioxin is a kind of organic Chlorine compounds are highly toxic and carcinogenic; new toxicology and endocrinology studies have proved that dioxins have carcinogenic effects on humans and animals, and extremely small doses of dioxins may also cause hormone secretion disorders and affect puberty development , and will cause damage to the human nervous and immune system. Due to its very long half-life and long-distance transfer through the atmosphere, it can be said that dioxins will be ubiquitous when they are discharged into the atmosphere. Water or food polluted by oxins will accumulate in the tissues of the body, and the half-life in the human body is as long as 5-10 years, causing continuous damage to health; CO is a highly toxic to the blood and nervous system. Pollutants, CO in the air enters the blood of the human body through the respiratory system, causing the body to die due to lack of oxygen, and in severe cases may endanger human life.

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