Towards cleaner air at Dolna Odra power plant

The coal-fired power plant in northwest Poland will build a new flue gas desulphurisation unit to meet emissions requirements.

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The facilities will improve air quality by cutting emissions of sulphur dioxide (SO2) and dust to levels below those required of large power plants by 2016, allowing the two boilers concerned to operate non-stop.

Scrubbing the flue gases

The construction of a new wet flue gas desulphurisation (WFGD) plant at Dolna Odra will set up a chemical reaction in which sulphur dioxide from the flue gas reacts with calcium carbonate to form gypsum. The process will strip the flue gas from two of the plant’s generating units of sulphur dioxide, a poisonous gas that contributes to the formation of acid rain and particulate pollution.

The reaction will take place in a steel absorber, in which flue gases are sprayed with an aqueous suspension of ground limestone. A separate unit will process ground limestone into a solution that can be pumped into the absorber. The gypsum solution will then be dehydrated, so that the by-product may be commercialised for other applications. Two new conveyor systems will be constructed to move the dried gypsum to a storage facility and for loading it onto transport. Meanwhile, one of the power plant’s stacks will be upgraded so that it can handle the wet gases from the desulphurisation process.

Significant reduction in polluting emissions

The new unit will cut SO2 emissions from the two boilers to levels not exceeding 200 mg/m³, with an oxygen content of 6 %. This will enable the plant to meet requirements under the EU’s Large Combustion Plant Directive (2001/80/EC).The total reduction in air pollutants emitted by the plant will amount to 5 649 Mg/year of sulphur dioxide (SO2) and 475 Mg/year of particulate dust.

Moreover, as the concentrations achieved will be lower than those required after 1 January 2016 (the permitted level of SO2 after 1 January 2016 for these generating units is 400 mg/m³, with each unit having an operating time of 7 500 h), Dolna Odra will be able to operate the two units on an unlimited basis.

The state-owned coal-fired power station Elektrownia Dolna Odra began operating in the 1970s and has eight power generating units.

Sulphur dioxide is created during the burning of fossil fuels, as the fuels release their sulphur and combine with oxygen in the boiler’s flue.

Total and EU funding

The project “Construction of the de-sulphurisation units for blocks 5 – 6 at Dolna Odra power generation plant” has an eligible budget of EUR 40 628 912, to which the EU’s European Regional Development Fund will contribute EUR 5 565 604 for the programming period 2007-2013.

Draft date