A. Ahlstrom Corporation

Pekka O Ritakallio

Rolf E Malmstrom

Method and apparatus for treating process gases

The invention relates to a method of improving the heat recovery in a waste head boiler, in which gas, produced in high-temperature processes and containing molten and/or solid particles and/or evaporated components, is cooled. In a waste heat boiler, a slowly cooling zone, i.e. a hot 'tongue' is generally formed in the gas flow. To improve the cooling of the hot 'tongue', gas and/or solid particles and/or vaporizing liquid, such as circulating gas or circulating particles separated from the process and cooled, are introduced into the hot zone or 'tongue'.

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Hameenlinna, Finland

Pekka O Ritakallio