Heat recovery process in coal gasification

A process for the recovery of heat in coal gasification which comprises:

• (a) generating gas in a coal gasification furnace;
• (b) introducing the gas into a granular bed means provided with heat transfer tubes having cooling medium passing therethrough thereby cooling the gas;
• (c) recovering the heat of the gas in the granular bed means as heated cooling medium;
• (d) passing the gas cooled in (b) successively through a gas cooler and a scrubber, to cool the gas and remove dust and tar mist therefrom;
• and
• recovering the heat of the gas cooled in step (d), wherein said granular bed means includes a fluidized bed cooler, in which said heat transfer tubes are located, and a granular moving bed filter, said gas being introduced into the fluidized bed cooler and unnecessary substances including tars which are in the gas are adhered to the granules in the fluidized bed cooler and then the gas is introduced into the granular bed filter where dust in the gas is removed by adherence to the granules in the filter, and wherein the cooling medium is water, the heat of the generated gas is recovered in the form of high pressure steam through the heat transfer tubes in the granular bed means, the heat in the gas cooler and the scrubber is recovered in the forms of medium pressure steam and of low pressure steam respectively.