FGD and DeNOx
NEWSLETTER       

                                                                                                         September 2005
                                                                                                             No. 329

Turow CFB Modernization Gained Lower Emissions, Increased Capacity

The last unit of the Turow CFB rehabilitation project in Poland was handed over to Elektrownia Turow in December 2004. Six pulverized coal (PC) boiler islands built in the 1950s and 1960s were replaced between 1994 and 2004. The new units had to be built in the same footprint of the old PC boilers; wide fuel flexibility was desired; emission limits of 371 mg/Nm³ for SO₂, 347 mg/Nm³ for NO_x and 50 mg/Nm³ for particulate were set; and increased generation capacity was desired.

Six CFB boilers with total capacity of 1491 MW were built in the same footprint as the six old PC boilers rated at 1200 MW. The new units offer a net efficiency of more than 37 percent (Units 1-3) and more than 39 percent (Units 4-6) compared to the 32 percent of the original design. Foster Wheeler introduced its Compact design for three of the CFB boilers (Units 4-6). Rafal Psik of Foster Wheeler Energia Polska and Janusz Jablonski and Jan Wyszynski of ElektrowniaTurow told Power-Gen Europe attendees that all parameters guaranteed in the contract, both performance- and environmental-related, have been met by a significant margin.

Even lower emissions to meet future EU requirements could be obtained with only minor adjustments. A NO_x limit of 200 mg/Nm³ could be achieved by adding a simple system to spray an ammonia/water solution into the separators. Further reduction of SO₂ could be achieved by increasing limestone injection into the furnace or by employing an ash activation solution. 

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