Abstract: A flue gas treatment system is provided which extracts most of the heat from the flue gas before scrubbing with large volumes of sea water. The scrubber liquids are sufficiently dilute that they can be safely returned to deep sea location while the scrubbed gases when mixed with sufficient volumes of ambient air can be directly returned to atmosphere without distribution by a large stack.

Abstract: In a multi-stage steam power plant a portion of the bleed steam is passed through a heat exchanger in the combustion air input duct to preheat the combustion air. The condenser output water is also passed through a heat exchanger in the combustion air input duct and then, before returning to the boiler feed water line, is passed through a heat exchanger in the flue and then a further heat exchanger in the air input duct. In this way heat from the condensate is retained in the system and heat from the flue gas is returned to the intake combustion air.

Abstract: A package steam boiler consists of four vertical combustion chambers surrounding a central vertical downcomer. A spherical steam drum is mounted at the top of the downcomer and a lower header is mounted at the bottom of the downcomer. The combustion chambers and downcomer are enclosed by tube-in-wall structures.