Flue gas heat recovery system
AssigneeMitsubishi Hitachi Power Systems, Ltd.
InventorsTakuya OKAMOTO, Shintaro HONJO, Norikazu INABA, Jun HASHIMOTO
Life of this patent
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Abstract
A flue gas heat recovery system includes a furnace, a combustion device, a flue gas duct, and a heat exchanging unit, and further includes a heat recovering unit disposed in the flue gas duct on the downstream side of the heat exchanging unit to recover heat from flue gas, and configured such that a path cross-sectional area of an outlet of the heat recovering unit is made smaller than a path cross-sectional area of an inlet of the heat recovering unit, and a first heat exchanger that heats combustion air by using heat recovered by the heat recovering unit.
Claims20
A flue gas heat recovery system for a boiler including a hollow furnace located in a vertical direction, a combustion burner that is disposed in a lower part of a wall constituting the furnace and blows fuel gas constituted by a mixture of fuel and combustion air toward the furnace, a flue gas path connected to an upper part of the furnace, in which a flue gas discharged from the furnace flows, and a heat exchanging unit disposed in the flue gas path to exchange heat between the flue gas and water from a condenser, comprising:
- a heat recovering unit disposed in the flue gas path on the downstream side of the heat exchanging unit to recover heat of flue gas and to heat a heat medium by the flue gas;
- a first heat exchanger that heats the combustion air by using heat recovered by the heat recovering unit;
- and
- a first heat medium circulation path, in which the heat medium circulates between the heat recovering unit and the first heat exchanger, wherein
- a cross-sectional area of the flue gas pass at an outlet of the heat recovering unit is configured to be smaller than a cross-sectional area of the flue gas pass at an inlet of the heat recovering unit.
Dependencies are inferred from the claim text.