Patnow power station
The Patnow-Adamow-Konin power station complex in central Poland has a combined capacity of 2,457 MW. Together, the three power stations have a 10% share in total Polish electricity production. To meet new Polish and European environmental standards, four existing lignite fired units at the Patnow power station are being retrofitted with Flue Gas Desulfurization(FGD) plants.
Each of these units has a 200 MW capacity. After a careful economic evaluation of all alternatives, Patnow power station ordered Rafako, a leading EPC contractor to the Polish power industry, to construct two wet limestone FGD plants, each with sufficient capacity for two of the 200 MW units.
The owner also decided, that he would not reheat the desulfurized flue gas before emission. The two existing chimneys were not suitable for wet stack operation, so it was necessary to build new chimneys or as two seperate chimneys. For all design alternatives, the required height was 149 m.
Rafako and specialized chimney constructor Karrena studied a number of alternatives and found, that two, PennguardTM lines concrete chimneys (New Chimney Design) would be the optimum approach for the Patnow site. Even though two chimneys seemed more expensive than one, the cost of each chimney could be kept low, by applying the PennguardTM lining directly to a slender 8.4 m diameter concrete shell, avoiding seperate flues. Each of these chimneys could be close to its own FGD absorber, minimizing the use of expensive ductwork.
The selected option of two PennguardTM lined concrete chimneys also offered some further advantages. First of all, two slender chimneys use far less space than one large diameter chimney with extensive ductwork. Furthermore, the slipforming of the two concrete shells could be done quickly, with minimal interference in the construction process of the FGD itself.