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A method for treating and utilizing coke oven flue gas resources

A resource processing and flue gas technology, which is applied in the field of coke oven flue gas resource processing and utilization, can solve the problem of no recycling of coke oven flue gas treatment, achieve high processing and utilization efficiency, promote ironmaking reactions, and reduce investment Effect

Active Publication Date: 2019-06-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the most widely used technology is to use the sintering machine to recycle the sintering flue gas treatment technology, and there is no recycling technology for coke oven flue gas treatment.

Method used

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  • A method for treating and utilizing coke oven flue gas resources

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The coke oven flue gas temperature is 250°C and the flow rate is 3000m 3 / min, where N 2 The content is 67.1%, O 2 Content is 9%, CO 2 The content is 5.4%, H 2 O content is 16%, SO 2 Content 500mg / m 3 , NO x The content is 1500mg / m 3 . The dust content of coke oven flue gas is less than 100mg / m3 after dehumidification treatment by bag dust removal and dehumidification equipment 3 , the moisture content is less than 15g / m 3 , and then with 500m 3 / min of oxygen and 990m 3 / min of air mixed, sent into the hot blast stove by the exhaust fan, heated to 1200°C in the hot blast stove, and then blown into the blast furnace by the blower through the tuyere of the blast furnace to chemically react with the blast furnace charge, SO 2 is reduced into molten iron and slag, NO x It is reduced into blast furnace gas, dioxin and other toxic organic substances are pyrolyzed, CO 2 and O 2 React with carbon in the blast furnace to generate CO to participate in the ironmakin...

Embodiment 2

[0033] The coke oven flue gas temperature is 286°C and the flow rate is 2500m 3 / min, where N 2 The content is 76.08%, O 2 The content is 13.45%, CO 2 The content is 3.14%, H 2 O content is 7.20%, SO 2 Content 350mg / m 3 , NO x The content is 800mg / m 3 . Coke oven flue gas is dehumidified by bag dust removal and dehumidification equipment to make the dust content less than 100mg / m 3 , the moisture content is less than 15g / m 3 , and then with 340m 3 / min of oxygen and 1340m 3 / min of air mixed, sent into the hot blast stove by the exhaust fan, heated to 1200°C in the hot blast stove, and then blown into the blast furnace by the blower through the tuyere of the blast furnace to chemically react with the blast furnace charge, SO 2 is reduced and enters molten iron and slag, NO x It is reduced into blast furnace gas, dioxin and other toxic organic substances are pyrolyzed, CO 2 and O 2 It reacts with carbon in the blast furnace to generate CO, and participates in the ...

Embodiment 3

[0035] The coke oven flue gas temperature is 220°C and the flow rate is 2000m 3 / min, where N 2 The content is 70.16%, O 2 The content is 12.62%, CO 2 The content is 6.4%, H 2 O content is 12%, SO 2 Content 400mg / m 3 , NO x The content is 1200mg / m 3 . Coke oven flue gas is dehumidified by bag dust removal and dehumidification equipment to make the dust content less than 100mg / m 3 , the moisture content is less than 15g / m 3 , and then with 240m 3 / min of oxygen and 2000m 3 / min air mixed, sent into the hot blast stove by the exhaust fan, heated to 1250°C in the hot blast stove, and then blown into the blast furnace by the blower through the tuyere of the blast furnace to chemically react with the blast furnace charge, SO 2 is reduced and enters molten iron and slag, NO x It is reduced into blast furnace gas, dioxin and other toxic organic substances are pyrolyzed, CO 2 and O 2 React with carbon in the blast furnace to generate CO and participate in the ironmaking ...

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Abstract

The invention relates to a method for treating and utilizing coke oven smoke resources. According to the method, coke oven smoke obtained after being subjected to dust removal and dehumidification treatment, air and enriched oxygen (or oxygen) are mixed in proportion, heated through an air heating furnace, and blown into a blast furnace from a blast furnace wind opening; the high-temperature strong reducing condition in the blast furnace is utilized for carrying out SO2, NOx and dioxin removal treatment on the coke oven smoke; meanwhile, O2 and CO2 in the coke oven smoke are utilized for participating in the blast furnace ironmaking reaction, the O2 and the CO2 in the coke oven smoke are utilized in ironmaking production, collection and utilization of the CO2 are achieved, and the CO2 emission is reduced; and N2 with the high content in the smoke assists in carrying and conveying heat of a furnace hearth on the lower portion of the blast furnace to the upper portion, the temperature of the upper portion of the blast furnace is increased, and the indirect reduction reaction of iron ore on the upper portion of the blast furnace is promoted. According to the method, the existing airheating furnace and the blast furnace of an iron and steel enterprise are utilized for treating and utilizing the coke oven smoke, newly-built large treating equipment is not needed, energy is saved,consumption is reduced, the indirect reduction reaction of the iron ore on the upper portion of the blast furnace is promoted, and the method has the advantages of being less in investment, high in treatment and utilization efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of coke oven flue gas treatment, and relates to a method for treating and utilizing coke oven flue gas resources, which fully utilizes the valuable resources in the coke oven flue gas resources in the ironmaking production process, and carries out the treatment of harmful substances. processing, protecting the environment and saving resources. Background technique [0002] As atmospheric problems become increasingly prominent, the country's requirements for flue gas emissions from the coking industry have become more stringent. Coke oven flue gas is mainly the exhaust gas produced after the combustion of coke oven heating gas, which contains a large amount of N 2 、H 2 O, O 2 , the greenhouse gas CO 2 and SO 2 , NO x , Dioxins and other pollutants. For a long time, companies have only used traditional desulfurization technology (FGD) and selective catalytic reduction technology (SCR) in series to remov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/001C21B2005/005C21B2100/24
Inventor 刘建华焦楷
Owner UNIV OF SCI & TECH BEIJING