Flue gas cleaning in energy generation
Flue gas cleaning serves to remove pollutants from the air before they can enter the atmosphere. They are used primarily in power plants and refuse incineration plants - providing for fresh air and a clean environment.
Flue gas cleaning in power plants is an additional, complex process stage and can be considered practically as a small-scale chemical factory within the power plant.
ProMinent products ensure for a smooth process with the highest possible level of cleaning
- Plants for metering of crude ammonia liquor,
or carbamide solution for the removal of nitrogen oxide
(SCR/SNCR method) (1)
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- Treatment and metering plants for limestone,
anhydrous lime and
slaked lime for desulphurization (2)
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- Big-Bag emptying systems as well as batching and
metering systems, e.g. for adipic acid for increasing
the efficiency of SO3 separation (3)
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- Polymer preparation stations for optimisation of
flocculation during heavy metal separation and
sludge dewatering (4)
The first process stage involves reducing nitrogen oxide levels, dusts are then removed by means of electrostatic precipitators and finally the sulphurous oxides are converted. The SCR or SNCR methods are used for flue-gas denitrification.(1)
Depending on the process, crude ammonia liquor or carbamide solution can be injected and the nitrogen oxides are converted into nitrogen and water.
There are many possible procedures for flue gas desulphurization. The most widely used is the wet absorption method. This method involves injecting limestone, anhydrous lime or slaked lime in suspension into the outlet air flow and converts the sulphurous oxides SO2 and SO3 into gypsum. (2)
Metering and treatment plants for these lime products are produced by our subsidiary, Tomal. The examples show a treatment plant for slaked lime and the feed unit for calcium oxide. Due to the specific properties of the base product, extensive experience in the application is required in order to be able to produce these robust and reliable plants. (3)
Adipic acid is added in order to increase the SO3 removal level to over 99%. This is dissolved by means of emptying stations for big-bags and is then metered into the lime products. (4)