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Treatment and utilization method for sintering flue gas

A technology of sintering flue gas and flue gas, which is applied in the field of metallurgy, can solve the problems of high operating cost, difficulty in using desulfurization products and denitrification products, etc., and achieve the effect of less increase in sulfur and nitrogen content

Active Publication Date: 2015-10-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no matter which method is used, special equipment must be built to treat the flue gas; and a large amount of desulfurizers and denitrification agents need to be used during the operation of the flue gas treatment, and the operating cost is high; the desulfurization products and denitrification products treated by some methods The product is still difficult to use

Method used

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  • Treatment and utilization method for sintering flue gas

Examples

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Comparison scheme
Effect test

Embodiment 1

[0053] After the sintering flue gas passes through the electrostatic precipitator, the temperature is 150°C. After passing through the main exhaust fan, it is sent to the hot blast stove through the gas pipeline. The flow rate is 5000 cubic meters per minute, and the air replacement rate is 100%, of which SO 2 Content 1000mg / m 3 , nitrogen oxide concentration 200mg / m 3 ; heated to 1200 ℃ in the hot blast furnace, blown into the blast furnace by the blower through the tuyere of the blast furnace; in the blast furnace, the sintering flue gas and the blast furnace charge undergo a chemical reaction, sulfur dioxide is reduced and enters molten iron and slag, nitrogen oxides are reduced and enter molten iron and Blast furnace gas, dioxin and furan decompose at high temperature, carbon dioxide reacts with carbon in the blast furnace to generate carbon monoxide, which becomes a reducing agent or enters blast furnace gas, oxygen reacts with carbon to generate carbon monoxide, and rele...

Embodiment 2

[0055] After the sintering flue gas passes through the bag dust removal, the temperature is 170°C, after passing through the main exhaust fan, it is sent to the hot blast stove through the gas pipeline, the flow rate is 4000 cubic meters per minute, and the air replacement rate is 80%, of which SO 2 Content 2000mg / m 3 , nitrogen oxide concentration 400mg / m 3 ;Heated to 1250°C in the hot blast furnace, blown into the blast furnace by the blower through the blast furnace tuyere; in the blast furnace, the sintering flue gas and the blast furnace charge undergo a chemical reaction, sulfur dioxide is reduced and enters molten iron and slag, nitrogen oxides are reduced and enter molten iron and Blast furnace gas, dioxin and furan decompose at high temperature, carbon dioxide reacts with carbon in the blast furnace to generate carbon monoxide, which becomes a reducing agent or enters blast furnace gas, oxygen reacts with carbon to generate carbon monoxide, and releases reaction heat....

Embodiment 3

[0057] After the sintering flue gas passes through the bag dust removal, the temperature is 200°C, after passing through the main exhaust fan, it is sent to the hot blast stove through the gas pipeline, the flow rate is 3000 cubic meters per minute, and the air replacement rate is 60%, of which SO 2 Content 3000mg / m 3 , nitrogen oxide concentration 600mg / m 3 ;Heated to 1250°C in the hot blast furnace, blown into the blast furnace by the blower through the blast furnace tuyere; in the blast furnace, the sintering flue gas and the blast furnace charge undergo a chemical reaction, sulfur dioxide is reduced and enters molten iron and slag, nitrogen oxides are reduced and enter molten iron and Blast furnace gas, dioxin and furan decompose at high temperature, carbon dioxide reacts with carbon in the blast furnace to generate carbon monoxide, which becomes a reducing agent or enters blast furnace gas, oxygen reacts with carbon to generate carbon monoxide, and releases reaction heat....

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Abstract

The invention relates to a treatment and utilization method for sintering flue gas. The method comprises the steps that dedusted sintering flue gas is heated through a hot blast heater, and the flue gas is heated to the temperature of 1000 DEG-1400 DEG C; heated flue gas is blown into a blast furnace through a blast-furnace tuyere to replace air for ironmaking production; high-temperature and highly reduced conditions in the blast furnace are utilized for conducting desulfuration, denitration and dioxin and furan removal on the sintering flue gas; and sensible heat in the flue gas and oxygen, carbon dioxide and carbon monoxide in the flue gas are utilized in ironmaking production. Compared with other sintering flue gas treatment techniques, the treatment and utilization method utilizes existing ironmaking production equipment for treating the sintering flue gas, the running cost is low, no new secondary products are produced, the latent heat of the sintering flue gas can be utilized, and carbon dioxide and carbon monoxide in the flue gas are caught and utilized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for treating and utilizing sintering flue gas. The flue gas is desulfurized, denitrified and dioxin-removed, and carbon monoxide, carbon dioxide, oxygen and latent heat in the flue gas are utilized. Background technique [0002] Sintering flue gas contains high content of sulfur dioxide, nitrogen oxides and dioxins, which seriously pollute the air; but sintering flue gas also contains carbon monoxide, oxygen and latent heat resources. Therefore, the sintering flue gas needs desulfurization, denitrification, and dedioxin treatment, and its latent heat resources and the carbon monoxide and carbon dioxide in it should be recycled. [0003] The treatment of sintering flue gas is divided into wet method, dry method and semi-dry method. However, no matter which method is used, special equipment must be built to treat the flue gas; and a large amount of desulfurizers and deni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/22C21B5/00
Inventor 刘建华魏付豪
Owner UNIV OF SCI & TECH BEIJING
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