05-07-2012, 02:54 PM
WASTE HEAT RECOVERY
WASTE HEAT RECOVERY.ppt (Size: 1.3 MB / Downloads: 83)
INTRODUCTION
Waste heat is heat, which is generated in a process by way of fuel combustion or chemical reaction, and then “dumped” into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its “value”. The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.
Large quantity of hot flue gases is generated from Boilers, Kilns, Ovens and Furnaces. If some of this waste heat could be recovered, a considerable amount of primary fuel could be saved. The energy lost in waste gases cannot be fully recovered. However, much of the heat could be recovered and thus loss is minimized
Commercial waste heat recovery Devices-
RECUPERATORS-metallic radiation, convective, radiation/ convective hybrid, ceramic
REGENARETORS
HEAT WHEELS
HEAT PIPE
ECONOMIZER
PLATE HEAT EXCHANGER
RECUPERATOR
Heat exchange
between flue gases
and air through
metallic/ceramic walls
Ducts/tubes carry
combustion air for
preheating
PLATE HEAT EXCHANGER
Parallel plates forming a thin flow pass
Avoids high cost of heat exchange surfaces
Corrugated plates to improve heat transfer
When directions of hot and cold fluids are
opposite, the arrangement is counter current
WASTE HEAT RECOVERY.ppt (Size: 1.3 MB / Downloads: 83)
INTRODUCTION
Waste heat is heat, which is generated in a process by way of fuel combustion or chemical reaction, and then “dumped” into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its “value”. The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.
Large quantity of hot flue gases is generated from Boilers, Kilns, Ovens and Furnaces. If some of this waste heat could be recovered, a considerable amount of primary fuel could be saved. The energy lost in waste gases cannot be fully recovered. However, much of the heat could be recovered and thus loss is minimized
Commercial waste heat recovery Devices-
RECUPERATORS-metallic radiation, convective, radiation/ convective hybrid, ceramic
REGENARETORS
HEAT WHEELS
HEAT PIPE
ECONOMIZER
PLATE HEAT EXCHANGER
RECUPERATOR
Heat exchange
between flue gases
and air through
metallic/ceramic walls
Ducts/tubes carry
combustion air for
preheating
PLATE HEAT EXCHANGER
Parallel plates forming a thin flow pass
Avoids high cost of heat exchange surfaces
Corrugated plates to improve heat transfer
When directions of hot and cold fluids are
opposite, the arrangement is counter current