Process method for denitrification of sintering flue gas using sensible heat of steel slag and effective components

Abstract

The invention relates to a technique for flue gas denitrification by sintering through steel slag sensible heat and effective constituents. The technique comprises the following steps: step 1, uniformly mixing sintered desulfurized tail gas and ammonia gas to form mixed gas; step 2, pouring first steel slag into a reactor from the top end of the reactor, introducing mixed gas into the reactor from the bottom end of the reactor via an induced draft fan, and then pouring second steel slag into the reactor from the top end of the reactor; step 3, reacting the mixed gas under the catalysis effect of the first steel slag and the second steel slag and carrying out heat exchange; step 4, collecting reacted tail gas from the top end of the reactor, and collecting the reacted first steel slag and the reacted second steel slag from the bottom end of the reactor; and step 5, recycling the reacted tail gas, the reacted first steel slag and the reacted second steel slag which are collected. The technique for flue gas denitrification by sintering through steel slag sensible heat and effective constituents has the beneficial effects that sensible heat resources and the effective constituents of the steel slag are fully utilized, the denitrification cost can be reduced effectively, and the purpose of economic and efficient denitrification is achieved; and resources of iron and steel enterprises are fully utilized, the optimization of utilization of solid waste resources is realized, and the investment cost is low.

Description

technical field [0001] The invention relates to the technical field of steel slag sensible heat and effective component utilization and iron ore sintering process desulfurization tail gas treatment technology, in particular to a process method for sintering flue gas denitrification by using steel slag sensible heat and effective components. Background technique [0002] my country's iron and steel production is dominated by the blast furnace-converter long process, and sinter accounts for more than 70% of the blast furnace charge structure. SO emissions from the sintering process 2 and NO x It accounts for 60% and more than 50% of the entire iron and steel production process. At the same time, it also discharges a large amount of harmful substances such as HF, HCl, heavy metals and dioxins, and is the main source of air pollution in iron and steel production. At present, my country's sintering flue gas desulfurization has made remarkable achievements, and the average desul...

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a process for denitration of sintering flue gas by using steel slag sensible heat and effective components, so as to solve the problem of low utilization rate of existing steel slag sensible heat and effective components

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