Finnish energy company Vantaan Energia has contracted Hitachi Zosen Inova to deliver the combustion boiler to the new combined cycle district energy (DE) plant serving the Helsinki area.
Replacing a former coal-powered plant, the new EUR60 million (US$87 million) Vaanta plant will reduce coal consumption by some 30%.
The plant will be fueled exclusively by municipal solid waste from the Helsinki metropolitan area – the cities of Helsinki, Vantaa and Espoo – reducing carbon dioxide emissions by up to 130,000 tonnes per annum.
The new facility, slated to begin operation in July 2014, consists of two waste-to-energy- units with a capacity of 64 MW each and a nominal annual throughput of 352,000 tonnes of municipal solid waste.
Steam derived from the municipal solid waste fired boilers will be overheated to 520 °C using exhaust from a gas turbine for combined power and heat production.
The maximal output of the combined facility will amount to 78 MW electrical and 107 MW thermal – approximately a 7 MW higher power production compared to a solution with two individual facilities.
The heat production will correspond to about half of Vantaa’s annual heat requirement.
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