Method of and an arrangement for recovering heat from bottom ash
AssigneeAmec Foster Wheeler Energia Oy
InventorMarko Ruuskanen
Life of this patent
Estimating the term…
Abstract
A method of recovering heat from bottom ash that is discharged from a combustion process in a furnace. Fuel and combustion air are fed into a furnace for combusting the fuel in order to generate heat energy to produce at least one of steam and hot water in a boiler arrangement, in which flue gases and bottom ash are generated. The bottom ash is discharged from the furnace. Heat is recovered from the flue gases. Heat is also recovered to a bottom ash cooling circuit from the bottom ash discharged from the furnace in order to utilize the recovered heat for preheating the combustion air in a heat exchanger. The heat exchanger is arranged in a combustion air heating circuit. Heat is exchanged from the bottom ash cooling circuit to the combustion air heating circuit.
Claims18
A method of recovering heat from bottom ash that is discharged from a combustion process in a furnace, the method comprising:
- feeding fuel and combustion air into a furnace for combusting the fuel, in order to generate heat energy to produce at least one of steam and hot water in a boiler arrangement, in which flue gases and bottom ash are generated;
- discharging the bottom ash from the furnace;
- recovering heat from the flue gases;
- recovering heat to a bottom ash cooling circuit from the bottom ash discharged from the furnace in order to utilize the recovered heat for preheating the combustion air in a heat exchanger;
- arranging the heat exchanger in a combustion air heating circuit;
- and
- exchanging the heat from the bottom ash cooling circuit to the combustion air heating circuit.
An arrangement for recovering heat from bottom ash that is discharged from a combustion process in a furnace of a boiler arrangement, in which fuel is combusted for generating heat to produce at least one of steam and hot water, and flue gases and bottom ash are generated, the arrangement comprising:
- a furnace for combusting fuel with combustion air, in order to generate heat energy to produce at least one of steam and hot water in a boiler arrangement, in which flue gases and bottom ash are generated;
- a feed for feeding combustion air into the furnace;
- a feed for feeding fuel into the furnace;
- a discharge for discharging the bottom ash from the furnace;
- a recovery device for recovering heat from the flue gases;
- a bottom ash cooling circuit adapted to recover heat from the bottom ash, the bottom ash cooling circuit including a heat exchanger;
- and
- a combustion air heating circuit that receives heat from the heat exchanger of the bottom ash cooling circuit, the combustion air heating circuit including a heat exchanger for heating the combustion air.
Dependencies are inferred from the claim text.