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Improving Existing Power Stations to Comply with Emerging Emissions Standards

AUTHORS: David H. Scott
DATE: March 1997

Environmental standards for utility power plants are gradually being tightened. At many locations, air quality is failing to meet newly agreed national standards. Local authorities are supplementing national emissions standards with more stringent local requirements. In consequence, existing plants may have to be modified to secure compliance.

A range of technologies is available for improving the performance of existing unites. Optimisation of combustion conditions can be a low cost option but the scope is plant and fuel specific. More substantial reductions in emissions may be achieved by flue gas treatment. The costs involved are considerable and problems may be created in the beneficial disposal of large quantities of solid by-products. However, it has been demonstrated that operators of utility scale pulverised coal fired power stations can achieve compliance with the most stringent current emission standards.