Abstract: A cogeneration plant is disclosed in which the feedwater from the deaerator heater is placed in heat exchange relation with the makeup water before the makeup water is delivered to the deaerator heater. The amount of heat transferred from the feedwater to the makeup water is controlled in response to the stack gas temperature. The feedwater from the heat exchanger is then placed in heat exchange relation with the stack gas, either in the economizer or through a separate coil, to take advantage of waste heat that would otherwise be lost.

Abstract: A gas turbine cogeneration plant having a combined heat recovery and emission control system with a first steam boiler having a bank of steam generating tubes upstream of a NOX emission reduction unit and second and third steam boilers having banks of steam generating tubes downstream of the NOX emission reduction unit and wherein the upstream steam boiler has a temperature responsive control system which regulates the upstream boiler pressure and thereby regulates the temperature and heat exchange rate of its steam generating tubes to regulate the temperature of the exhaust gas stream at the NOX emission reduction unit.

Abstract: A gas turbine engine power plant employing a water injection system having a water/fuel mixing device for injecting water into the engine fuel as it is conducted to the engine combustion chambers. The water/fuel mixing device employs a fuel conduit with a helical arrangement of water injection apertures for injecting water jets through the fuel to impinge upon the inside wall of the conduit and mix homogeneously with the fuel.