Limestone/Lime - Gypsum Wet Flue Gas Desulfurization

A brief description of the technology

Limestone/lime/carbide slag is used as desulfurization absorbent, and the limestone/lime/carbide slag is crushed into powder, mixed with water, and stirred to form absorption slurry; limestone slurry is pumped into the absorption column through the slurry circulating pump to make full contact with the flue gas, so that SO2 in the flue gas reacts with CaCO3 in the slurry to generate calcium sulfite (while removing other pollutants in the flue gas); oxidizing air is blown into the slurry pool at the lower part of the absorption column to forcibly oxidize calcium sulfite to calcium sulfate; when calcium sulfate reaches a certain saturation, it forms crystals and dihydrate gypsum is separated, thus completing the desulfurization reaction.


Technical features

1. No-packing single-circuit spray column is adopted, and there are no components in the gas-liquid contact area of the column, which can effectively reduce the running resistance in the column.

2. By means of computer simulation and based on actual engineering experience, the arrangement of desulfurization column and its internal components are optimized to ensure the stable flow of flue gas, evenly spray of slurry in the desulfurization column, and the full contact of gas and liquid in the column, so as to achieve the best desulfurization effect.

3. The technology is mature, reliable and stable


Applicable scope

Newly built desulfurization plant or desulfurization retrofitting


Applicable industries

Metallurgy, chemical industry, thermal power plant, etc.


Process flow

The flue gas from the dust collector passes through a booster fan and enters a heat exchanger. After being cooled, the flue gas enters an absorption column and is mixed with limestone slurry. Some of the water in the slurry evaporates and the flue gas further cools. It can remove 95% of sulfur in the flue gas through scrubbing by the circulating limestone slurry. Moreover, nearly 100% of hydrogen chloride in the flue gas can be removed. At the top of the absorber, flue gas passes through a demister to remove suspended water droplets and is discharged through a stack.


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