A double-alkali flue gas desulfurization process

A desulfurization process and dual-alkali process technology, applied in the field of flue gas/waste gas treatment, can solve the problems of difficulty in operation and maintenance, poor regeneration effect, reduction of flue gas temperature, etc., achieve full conversion and utilization of materials, and overcome the significant reduction of flue gas temperature. Effect

Active Publication Date: 2021-06-29
XIANGTAN UNIV
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Problems solved by technology

However, due to the extremely low conversion rate of the direct reaction between the oxidation by-product sodium sulfate and lime, the regeneration effect is not good, and sodium alkali needs to be replenished regularly, which increases the cost; difficult to maintain
In addition, wet desulfurization will also greatly reduce the flue gas temperature, so the flue gas treatment market in water-scarce areas and certain industries (such as coking industry) is subject to certain restrictions
[0013] The spray drying method and pipeline injection method in sodium-alkali desulfurization are currently the most widely used dry / semi-dry processes, but the desulfurization product (the main component is sodium sulfate) is not regenerated, and it is difficult to dispose of it due to the impact of downstream market demand. The high cost of desulfurization has become a short board for the popularization and application of this type of technology

Method used

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  • A double-alkali flue gas desulfurization process

Examples

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Effect test

Embodiment 1

[0032] For flue gas desulfurization of a coke oven, the initial inlet flue gas temperature is 170-180°C, SO 2 Concentration 120mg / Nm 3 about.

[0033] The flue gas desulfurization unit of the process system adopts spray drying technology and equipment: using sodium bicarbonate as absorbent, first mix it with water in the slurry mixing tank to form a slurry with a mass fraction of about 20%, and then spray it into the absorption tower through a sprayer. The absorption tower is in full contact with the hot flue gas (residence time is about 1.5 seconds), and the SO in it is removed 2 , to generate a dry powder product, the main components are sodium sulfate, a small amount of sodium carbonate and a small amount of sodium sulfite, which are collected by the bag filter after entering the absorption tower.

[0034] Desulfurization agent regeneration unit of the process system: 100kg of the reaction product taken out of the bag filter of the above desulfurization unit is mixed with...

Embodiment 2

[0038] A coal-fired boiler flue gas purification project, the initial inlet flue gas temperature is 150-165°C, SO 2 Concentration 400mg / Nm 3 .

[0039] Flue gas desulfurization unit: adopt dry process and equipment, use solid sodium bicarbonate as absorbent, first grind and sieve sodium bicarbonate, and then spray it into the flue reactor with the help of fluidized wind according to the reaction metering ratio, and mix with hot flue gas Full contact, the reaction removes SO 2 , to generate sodium sulfate and a small amount of sodium carbonate product, which is dry powder and is collected by the bag filter.

[0040] Desulfurization agent regeneration unit: 20kg of the reaction product taken out of the bag filter of the above desulfurization unit is mixed with water to make a slurry with a mass concentration of about 30%, inject it into the regeneration reaction device, mix and add 26kg of regeneration medium (ammonium bicarbonate) and stir for reaction together About 1h, the...

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Abstract

The invention discloses a double-alkali flue gas desulfurization process. The present invention at least includes a desulfurization unit, a desulfurizing agent regeneration unit and a by-product recovery unit. The present invention realizes efficient regeneration of sodium-alkali absorbent using cheap lime through the combination of medium circulation solubilization and reaction intensification technology, thereby solving the problem of sodium-based dry process / Semi-dry desulfurization process product disposal and utilization and high operating costs, and overcome the traditional wet double-alkali desulfurization process flue gas temperature greatly reduced, the crux of the fouling in the tower; the process system is highly integrated, the material Fully transformed and utilized, green and energy-saving.

Description

technical field [0001] The invention relates to a desulfurization technology in the field of flue gas / waste gas treatment, in particular to a sodium-calcium double-alkali flue gas desulfurization process. Background technique [0002] In order to reduce air pollution such as acid rain, smog, and sulfuric acid smog, it is necessary to strictly control SO in flue gas emissions from thermal power plants, coal-fired boilers, industrial furnaces, and waste incineration processes. 2 It is an effective technical measure to implement flue gas desulfurization on the flue gas or waste gas of the above-mentioned fossil fuel-based combustion equipment. The current mainstream technical processes and methods include two categories: wet process and dry / semi-dry process. The wet process includes limestone / lime-gypsum method, ammonia method, double alkali method and magnesium oxide method, etc.; The methods include spray drying (SDA) based on lime (calcium-based) or sodium-alkali absorbent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/80B01D53/50B01D53/96
CPCB01D53/501B01D53/508B01D53/96B01D2251/304B01D2251/604B01D2251/606B01D2258/0283
Inventor 杨柳春朱旻俊张俊丰黄妍
Owner XIANGTAN UNIV
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