Waste heat recovery system and method of recovering waste heat from a furnace
OwnerHisashi Kobayashi, Chao Lianginventors
Life of this patent
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Abstract
Disclosed is a flue gas heat recovery system and method for a glass melting furnace. In a first stage, the sensible heat of the flue gas is reduced in a regenerator or by use of high electric energy input in a hybrid electric furnace. In a second stage, the flue gas is used in a heat transfer fluid heater to provide heat to a heat transfer fluid. In a third stage, the heat transfer fluid provides heat to a batch/cullet preheater (BCPH) to preheat batch and/or cullet in an indirect heat exchanger such as a screw heat exchanger.
Claims28
A flue gas heat recovery system, comprising:
- a regenerator configured to receive a flue gas from a glass melting furnace and recover heat from the flue gas;
- a heat transfer fluid heater configured to receive flue gas from the regenerator, receive a heat transfer fluid, and transfer heat from the flue gas to the heat transfer fluid;
- and
- a batch/cullet preheater configured to receive the heat transfer fluid from the heat transfer fluid heater, to receive batch and/or cullet, to transfer heat by indirect heat exchange from the heat transfer fluid to the batch and/or cullet;
- and to recirculate the heat transfer fluid to the heat transfer fluid heater;
- wherein the glass melting furnace is configured to receive the batch and/or cullet from the batch/cullet preheater.
A method of recovering heat from a flue gas, comprising:
- (A) recovering heat from a flue gas from a glass melting furnace in a regenerator for reducing the temperature of the flue gas;
- (B) transferring heat from flue gas from the regenerator to a heat transfer fluid in a heat transfer fluid heater;
- (C) heating a batch and/or cullet in a batch/cullet preheater by indirect heat exchange using the heat transfer fluid from the heat transfer fluid heater;
- (D) recirculating the heat transfer fluid from the batch/cullet preheater to the heat transfer fluid heater;
- and
- (E) feeding the batch and/or cullet from the batch/cullet preheater to the glass melting furnace.
A flue gas heat recovery system, comprising:
- a glass melting furnace configured to provide heat by combustion of a fuel and by electric energy to melt glass, and configured to produce a flue gas having a sensible heat of less than 0.5 GJ per ton of the glass produced,
- a heat transfer fluid heater configured to receive flue gas from the glass melting furnace, receive a heat transfer fluid, and transfer heat from the flue gas to the heat transfer fluid;
- and
- a batch/cullet preheater configured to receive the heat transfer fluid from the heat transfer fluid heater, to receive batch and/or cullet, to transfer heat by indirect heat exchange from the heat transfer fluid to the batch and/or cullet;
- and to recirculate the heat transfer fluid to the heat transfer fluid heater;
- wherein the glass melting furnace is configured to receive the batch and/or cullet from the batch/cullet preheater.
A method of recovering heat from a flue gas, comprising:
- (A) melting glass in a glass melting furnace using heat from combustion of fuel and electric energy, and producing a flue gas having a sensible heat of less than 0.5 GJ per ton of the glass melted,
- (B) transferring heat from flue gas from the glass melting furnace to a heat transfer fluid in a heat transfer fluid heater;
- (C) heating a batch and/or cullet in a batch/cullet preheater by indirect heat exchange using the heat transfer fluid from the heat transfer fluid heater;
- (D) recirculating the heat transfer fluid from the batch/cullet preheater to the heat transfer fluid heater;
- and
- (E) feeding the batch and/or cullet from the batch/cullet preheater to the glass melting furnace.
Dependencies are inferred from the claim text.