Abstract
The overall efficiency of process equipments can be significantly improved by heat recovery from waste gases, the recovered heat being utilised for raising steam, preheating air, etc. This paper reports on developments of a novel technique which utilises solids transfer between adjacent fluidized beds by means of jet jumps for recovering and/or storing waste heat. Results showed that the fluidized bed heat exchanger effectiveness approached 80% of a perfect parallel flow heat exchanger. The effectiveness increased with increasing jet pump flowrate, fluidizing velocity and by the use of vertical baffles. The rate of heat recovery could be easily controlled, by controlling the solid circulation rate. The advantages of the proposed heat exchanger includes, lack of moving parts, freedom from fouling and corrosion, low cross-contamination of gases and it is based on proven technology. Application envisaged is, as a preliminary unit for recovering waste heat from dust contaminated, high temperature exhaust gases.
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