Importance

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Abstract

The present invention relates to a method of converting a raw material stream into a product stream by passing said raw material stream through a bed of fluidized solid particles and allowing heat exchange to occur between the bed of fluidized solid particles and the raw material stream, said method being characterized in that it alternately employs a production mode and a restoration mode to control the temperature of the bed of fluidized solid particles: -said production mode comprising passing the raw material stream through the bed of fluidized solid particles and allowing the temperature of the fluidized solid particles in the bed to decrease or to increase as a result of the production energy associated with the conversion of the raw materials stream into the product stream; and -said restoration mode comprising restoring the temperature of the bed of fluidized solid particles by passing a restoration stream through the bed of fluidized solid particles to decrease the temperature of the fluidized solid particles in case the temperature of the fluidized solid particles has increased during the production mode or to increase the temperature of the fluidized solid particles in case the temperature of the fluidized solid particles has decreased during the production mode, and that -the fluidized solid particles are kept in the same reactor. The present method enables continuous operation of the fluidized bed reactor without the need of recirculating externally heated or cooled solid bed particles and/or for special heat exchange equipment placed inside or enclosing the fluidized bed reactor.

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First Claim