A system and method for harnessing latent heat to generate energy. The system and method provide a fully closed latent heat recovery system that utilizes a vapor source to generate vapor. A plurality of conduits carries the vapor and resultant gas, expanded energy, and condensate to: a vapor expander, a compressor, a heat exchanger, an accumulator, and a vapor condenser for expansion, compression, and conversion between states of the vapor. The latent heat generated from the expansion and energy release from the vapors and gases produces work for driving a load.

A power plant with a fossil fuel fired boiler, an air feed system, flue gas system and condensate system. A unitary flue gas heat exchanger spans a bypass line in the flue gas system and the condensate system so as to improve the thermal efficiency of the power plant while minimising complexity.

A power plant with a fossil fuel fired boiler, an air feed system, flue gas system and condensate system. A unitary flue gas heat exchanger spans a bypass line in the flue gas system and the condensate system so as to improve the thermal efficiency of the power plant while minimising complexity.

A power plant is suggested with an additional heat transfer between the flue gas that flows through a flue gas line (5) and the feed-water in a feed-water line (19). The claimed arrangement of the first heat exchanger (13) upstream and adjacent to a precipitator (7) leads to a reduced space demand and optimizes dust precipitation as well as the pressure drop of the flue gas.

A power plant is suggested with an additional heat transfer between the flue gas that flows through a flue gas line (5) and the feed-water in a feed-water line (19). The claimed arrangement of the first heat exchanger (13) upstream and adjacent to a precipitator (7) leads to a reduced space demand and optimizes dust precipitation as well as the pressure drop of the flue gas.

An apparatus for using a water coil air heater with a single bank economizer. A boiler economizer arrangement includes an economizer bank which has separate hot pass bank and cold pass bank economizer portions in a parallel arrangement, each facing the same flow of hot flue gas. Feedwater enters the cold pass bank economizer where it is heated by the hot flue gas, and then flows to a water coil air heater away from the hot flue gas. The feedwater dissipates heat energy in the water coil air heater which may be used to heat air bound for combustion. The feedwater continues into the hot pass bank economizer portion of the economizer arrangement where it absorbs additional heat from the flue gas. The heated feedwater flows out of the economizer arrangement and may be subject to additional heating by a boiler or other heat exchanger.

An apparatus for using a water coil air heater with a single bank economizer. A boiler economizer arrangement includes an economizer bank which has separate hot pass bank and cold pass bank economizer portions in a parallel arrangement, each facing the same flow of hot flue gas. Feedwater enters the cold pass bank economizer where it is heated by the hot flue gas, and then flows to a water coil air heater away from the hot flue gas. The feedwater dissipates heat energy in the water coil air heater which may be used to heat air bound for combustion. The feedwater continues into the hot pass bank economizer portion of the economizer arrangement where it absorbs additional heat from the flue gas. The heated feedwater flows out of the economizer arrangement and may be subject to additional heating by a boiler or other heat exchanger.

A multistage boiler heat exchange apparatus has a combustion furnace and at least one boiler set. The combustion furnace is used to produce a heat source and has a furnace base and a hot-air passage. The at least one boiler set is connected to the combustion furnace, and each has a preheater and a boiler. The preheater is deposited adjacent to the combustion furnace, and is connected to and communicates with the hot-air passage to adjust temperature of the heat source that enters the preheater. The boiler is an uprightly-deposited cylinder, is connected to the preheater, and has a conducting pipe and an exchange tube. The conducting pipe is deposited on and communicates with the boiler to enable the heat source to enter the boiler. The exchange tube is deposited in the boiler and has an exchange medium to exchange heat with the heat source in the boiler.

A multistage boiler heat exchange apparatus has a combustion furnace and at least one boiler set. The combustion furnace is used to produce a heat source and has a furnace base and a hot-air passage. The at least one boiler set is connected to the combustion furnace, and each has a preheater and a boiler. The preheater is deposited adjacent to the combustion furnace, and is connected to and communicates with the hot-air passage to adjust temperature of the heat source that enters the preheater. The boiler is an uprightly-deposited cylinder, is connected to the preheater, and has a conducting pipe and an exchange tube. The conducting pipe is deposited on and communicates with the boiler to enable the heat source to enter the boiler. The exchange tube is deposited in the boiler and has an exchange medium to exchange heat with the heat source in the boiler.

A multistage boiler heat exchange apparatus has a combustion furnace and at least one boiler set. The combustion furnace is used to produce a heat source and has a furnace base and a hot-air passage. The at least one boiler set is connected to the combustion furnace, and each has a preheater and a boiler. The preheater is deposited adjacent to the combustion furnace, and is connected to and communicates with the hot-air passage to adjust temperature of the heat source that enters the preheater. The boiler is an uprightly-deposited cylinder, is connected to the preheater, and has a conducting pipe and an exchange tube. The conducting pipe is deposited on and communicates with the boiler to enable the heat source to enter the boiler. The exchange tube is deposited in the boiler and has an exchange medium to exchange heat with the heat source in the boiler.