C - Chemistry – Metallurgy – 10 – F
Patent
C - Chemistry, Metallurgy
10
F
44/57
C10F 5/06 (2006.01)
Patent
CA 1119407
ABSTRACT OF THE DISCLOSURE A process is provided for the wet carbonizing of peat. The raw peat is first formed into a pumpable aqueous suspension in a suspension-preparing apparatus. The peat suspension is then preheated in series-connected heat exchangers and in a pre- heating tower. The preheated peat suspension is then wet car- bonized in a reactor into which steam from a steam boiler is introduced at a temperature of 200°C, The wet carbonized peat suspension is then cooled by heat exchanger in the preheating tower, is then mechanically dewatered in a dewatering apparatus and is then dried in a drying apparatus, with hot exhaust gases from the steam boiler being introduced as drying gas into such drying apparatus. An important facet of this process, then of aspects of this invention is that the exhaust gases from the steam steam boiler are employed as drying gas in the drying apparatus and that the exhaust gas, carrying dust and water vapour, leaving the drying apparatus is purified and cooled in a wet separator. Part of the water vapour in the exhaust gas is condensed in the wet separator and polluted water coming from the dewatering ap- paratus is cooled by heat exchange with the raw peat suspension in the heat exchanger thereupon is introduced as washing water into the wet separator, The dust-laden and heated drain water from the wet separator is returned to the suspension-preparing apparatus to be used as dilution water therein. In this matter, efficient exhaust gas purification relating to equipment of the plant is combined with product and heat recovery in the plant.
301385
Jp-Energy Oy
Marcus & Associates
LandOfFree
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