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Integral purification process of pollutants in sintering flue gas

A purification process, a technology for sintering flue gas, applied in air quality improvement, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of high operating costs, poor dioxin removal effect, and inability to integrate pollutants Treatment and other problems to achieve the effect of high removal rate

Inactive Publication Date: 2014-06-25
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above three patents respectively disclose the conventional application of sodium-alkali dry desulfurization, sodium-alkali wet desulfurization, and absorbents containing sodium-alkali, and cannot carry out integrated treatment of the pollutants emitted by sintering flue gas in ironmaking production, and the The removal effect of dioxin in the flue gas is not good, and the operation cost is high

Method used

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  • Integral purification process of pollutants in sintering flue gas
  • Integral purification process of pollutants in sintering flue gas

Examples

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Effect test

Embodiment 1

[0036] An integrated purification process for sintering flue gas pollutants, the specific steps are as follows:

[0037] A. The flue gas, sodium bicarbonate dry powder and brown coal powder are continuously fed into the circulating fluidized bed reactor. The flue gas makes the sodium bicarbonate dry powder and brown coal powder in a fluidized state and reacts with them to remove sulfur oxidation in the flue gas. Pollutants such as chemicals, nitrogen oxides and dioxins;

[0038] B. The flue gas after preliminary purification in step A is sent to the desulfurization section of the absorption tower, and the sodium bicarbonate aqueous solution is used as the absorption liquid to spray from the upper part and contact the flue gas from the lower part in countercurrent contact to remove the sulfur in the flue gas Oxide and other acidic components;

[0039] C. The flue gas after desulfurization enters the denitration section of the absorption tower, and the oxidant solution containing sodi...

Embodiment 2

[0041] An integrated purification process for sintering flue gas pollutants, the specific steps are as follows:

[0042] A. Spray sodium bicarbonate dry powder and brown coal powder directly into the flue to react with the flue gas, and initially remove the pollutants such as sulfur oxides, nitrogen oxides and dioxins in the flue gas;

[0043] B. The flue gas after preliminary purification in step A is sent to the desulfurization section of the absorption tower, and the sodium bicarbonate aqueous solution is used as the absorption liquid to spray from the upper part and contact the flue gas from the lower part in countercurrent contact to remove the sulfur in the flue gas Oxide and other acidic components;

[0044] C. The flue gas after desulfurization enters the denitration section of the absorption tower, and the oxidant solution containing sodium bicarbonate is used as the absorption liquid to spray from the upper part to further remove the nitrogen oxides in the flue gas, and at ...

Embodiment 3

[0047] The implementation of this example is basically the same as that of example 1, on this basis:

[0048] The solid reaction product discharged from the bottom of the circulating fluidized bed reactor, and the absorption liquid discharged from the bottom of the desulfurization section and the denitration section of the absorption tower are sent to the recovery treatment system.

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Abstract

The invention provides an integral purification process of pollutants in sintering flue gas to effectively remove the pollutants such as sulfur trioxide and dioxin from the sintering flue gas. The process comprises the following concrete steps: A, continuously feeding the flue gas, dry sodium hydrogen carbonate powder and lignite powder into a circulating fluidized bed reactor, fluidizing the dry sodium hydrogen carbonate powder and the lignite powder by the flue gas, and reacting the flue gas with the fluidized dry sodium hydrogen carbonate powder and the fluidized lignite powder, or directly injecting the fluidized dry sodium hydrogen carbonate powder and the fluidized lignite powder into a flue for reacting with the flue gas so as to initially remove the pollutants from the flue gas; B, feeding the initially purified flue gas into a desulfurization section of an absorption tower, and spraying the initially purified flue gas by a sodium hydrogen carbonate water solution as absorption liquid from the upper part so as to enable the flue gas entering from the lower part to be in countercurrent contact with the sodium hydrogen carbonate water solution to remove sulfur oxides and other acidic components from the flue gas; and C, feeding the desulfurized flue gas into a denitration section of the absorption tower, spraying the flue gas after desulfurization by a sodium hydrogen carbonate-containing oxidant solution as absorption liquid from the upper part to further remove nitrogen oxides from the flue gas, and discharging purified flue gas from the top of the absorption tower.

Description

Technical field [0001] The invention relates to the technical field of environmental protection, in particular to an integrated purification process for sintering flue gas pollutants. Background technique [0002] Sintering production is an important process in the ironmaking production process, which can improve the metallurgical properties of iron ore and remove harmful impurities in raw materials. However, the amount of waste gas produced by sintering is large, which seriously pollutes the atmosphere. The amount of sintering flue gas produced and the amount of dust content varies with the sintering type, sintering area, material bed thickness, material bed air permeability, and the size of the charged particles. Generally, about 1 t of sintered ore is produced. Generate 4000~6000m 3 The dust content of the flue gas is generally 1~5g / m 3 . The sintering process is a complex physical and chemical process. Due to the diversity of raw materials, fluxes, and solid fuel components...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/83B01D53/64B01D53/60B01D53/70B01D53/68B01D53/44
CPCY02A50/20
Inventor 任毅李东林郎治
Owner CHENGDU HUAXITANG INVESTMENT
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