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Integrated purification and recovery process of sintering flue gas pollutants

A technology for sintering flue gas and pollutants, which is applied in the chemical industry, climate sustainability, air quality improvement and other directions, which can solve the problem that pollutants cannot be treated in an integrated manner, high operating costs, and poor dioxin removal effect. and other problems to achieve the effect of avoiding secondary pollution, low operating costs, and strong adsorption

Active Publication Date: 2016-04-06
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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  • Integrated purification and recovery process of sintering flue gas pollutants
  • Integrated purification and recovery process of sintering flue gas pollutants

Examples

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Effect test

Embodiment 1

[0050] The integrated purification and recovery process of sintering flue gas pollutants, the specific steps are as follows:

[0051] A. The flue gas, sodium bicarbonate dry powder and lignite powder are continuously sent into the circulating fluidized bed reactor, and the flue gas makes the sodium bicarbonate dry powder and lignite powder into a fluidized state and reacts with them, and the pollution in the flue gas is initially removed thing;

[0052] B. Send the flue gas that has been preliminarily purified in step A to the desulfurization section of the absorption tower, and use aqueous sodium bicarbonate solution as the absorption liquid to spray from the upper part to remove sulfur oxides and other acidic components in the flue gas; after desulfurization The flue gas enters the denitrification 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...

Embodiment 2

[0056] The integrated purification and recovery process of sintering flue gas pollutants, the specific steps are as follows:

[0057] A. Spray sodium bicarbonate dry powder and lignite powder directly into the flue to react with the flue gas, and initially remove pollutants in the flue gas;

[0058] B. Send the flue gas that has been preliminarily purified in step A to the desulfurization section of the absorption tower, and use aqueous sodium bicarbonate solution as the absorption liquid to spray from the upper part to remove sulfur oxides and other acidic components in the flue gas; after desulfurization The flue gas enters the denitrification 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 the purified flue gas is discharged from the top of the absorption tower; The absorption liquid discharged from the bottom of th...

Embodiment 3

[0062] The implementation mode of this embodiment is basically the same as embodiment 1, on this basis:

[0063] The solid reaction product discharged from the bottom of the circulating fluidized bed reactor is dissolved and filtered to obtain a filtrate, which is combined with the filtrate obtained in step B and then sent to step C for processing.

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Abstract

The invention provides an integrated purification and recycling process for sintering smoke pollutants, and aims to effectively remove pollutants in sintering smoke. The process comprises the following steps: organically combining a dry-method sodium hydrogen carbonate emission control system, a brown coal emission control system, a wet-method sodium hydrogen carbonate emission control system and an oxidant emission control system to realize performance complementation; all the pollutants discharged in an iron-making and sintering production process have the removing rate of more than 99%. Meanwhile, the pollutants are converted into a useful chemical product, namely sulfur; no wastes including wastewater, waste dreg and the like are discharged.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an integrated purification and recovery process for sintering flue gas pollutants. Background technique [0002] Sintering production is an important process in the process of ironmaking production, 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 and its dust content vary with factors such as sintering machine type, sintering area, material bed thickness, material bed air permeability, and particle size of the material. Generally, about 1 ton of sinter is produced 4000-6000m 3 The flue gas, the dust content 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 componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/83B01D53/56B01D53/70B01D53/44B01D53/60B01D53/78B01D53/50B01D53/40B01D53/64B01D53/96C01B17/04
CPCY02A50/20Y02P20/10Y02P20/129Y02P20/50
Inventor 任毅李东林郎治
Owner CHENGDU HUAXITANG INVESTMENT
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