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Abstract

Heat can be recovered from hot gas produced in a thermal reactor (1), by injecting water into the gas at one or more injection zones (4) in such an amount and in such a way that the gas temperature due to water evaporation is reduced to below 400.degree. C., preferably below 300.degree. C., possibly below 150-200.degree. C., and the gas dew point becomes at least 60.degree. C., preferably at least 70.degree. C., possibly 80 or 85.degree. C. The gas can then be led through a condensing heat exchanger unit (8), where at least some of the gas contents of water vapour are condensed, and the condensing heat can be utilized for heating of a stream of fluid, mainly water. Hereby, a method for production of hot water is obtained, which is cheap and simple and has low maintenance costs, and which moreover has a high efficiency degree and good environmental qualities The method can be used for a broad spectrum of fuels and conversion technologies.

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First Claim