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Limestone / Lime gypsum FGD process
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One. Working principle

Limestone / lime gypsum FGD used limestoneor lime as a sorbent for desulphurization. The limestone was crushed intopowder and mixed with water and stirred into the absorption slurry. When thelime was used as absorbent, the lime powder was digested and then added to theabsorbent slurry. In the absorption tower, the absorption of the slurry ismixed with the flue gas, and the sulfur dioxide in the flue gas is chemicallyreacted with the calcium carbonate in the slurry and the drumming oxidizingair, and the final product is plaster.

Two. Reaction process

1. Absorption

SO2 + H2O-----H2SO3

SO3 + H2O-----H2SO4

2, neutralization

CaCO3 + H2SO3-------CaCO3 + CO2 + H2O

CaCO3 + H2SO4-------CaCO4 + CO2 + H2O

CaCO3 +2HCI--------CaCI2+ CO2 + H2O

CaCO3 +2HF-------- CaF2+ CO2 + H2O

3, oxidation

2CaSO3 + O2--------2CaSO4

4, crystallizing

CaSO4 + 2H2O-------- CaSO4 • 2H2O

Three. System composition

The desulfurization system is mainlycomposed of flue gas system, absorption oxidation system, limestone / limeslurry preparation system, by-product treatment system, wastewater treatmentsystem, public system (process water, compressed air, accident slurry tanksystem, etc.), electrical control system and so on.

Four. Process flow

Boiler / kiln - - dust collector - -induced draft fan - - absorption tower - chimney

The flue gas from the boiler or kiln entersthe absorption tower under the action of the fan after the dust removal. Theabsorption tower is the structure of the counter flow spray air tower. Theabsorption and oxidation functions are integrated, the upper part is theabsorption area, the lower is the oxidation area, and the flue gas after thededusting is in reverse contact with the circulating liquid in the absorptiontower. The system usually has 3-5 liquid circulation pumps, and eachcirculation pump corresponds to a layer of atomizing spray layer. When only oneunit is running or the load is low, the 1-2 layer spray tower can be stopped,and the system still maintains a high liquid - gas ratio, which can achieve thedesired desulfurization effect. A two stage mist eliminator is installed on theupper part of the absorption zone, and the free moisture in the flue gas of thedemister outlet is not more than 75mg/Nm3. After the SO2 is absorbed, theslurry enters the circulating oxidation zone. In the circulating oxidationzone, the calcium sulfite is oxidized into the gypsum crystal by the air pumpedinto it. At the same time, the absorption and preparation system is providedwith fresh gypsum stone slurry to the absorption oxidation system, which isused to supplement the consumed limestone, so that the absorption slurry keepsa certain pH value. When the slurry of the reaction product reaches a certaindensity, it is discharged to the desulphurization byproduct system, and thegypsum is formed after dehydration.

Five. Process characteristics

1, the efficiency of desulphurization ishigh, and more than 95% can be kept.

2, the most widely used, mature technologyand reliable operation.

3. It is adaptable to coal variety and loadvariation and is suitable for high sulfur coal.

4. The desulfurizer is rich in resourcesand the price is cheap.

5, it can play the role of further dustremoval.

Six.application field

Flue gas desulfurization such as coal-firedpower generation boiler, cogeneration boiler, central heating boiler, sinteringmachine, pellet kiln, coking furnace, glass furnace and so on.

Friendship tip: the technology is the mostwidely used, mature technology, good adaptability to the change of flue gasload and coal, high desulfurization efficiency. It is particularly suitable forhigh sulfur coal and environmental emission requirements, but the system isrelatively complex, the investment cost is high, and the chimney needs to carryout anti-corrosion treatment.


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