Abstract: A waste-to-energy plant which is designed and operated to burn municipal waste combines a high pressure steam turbine/generator cycle and a combustion turbine/generator cycle; wherein the exit gas from the combustion turbine is utilized to superheat high pressure steam prior to entering the steam turbine. The combination of the combustion turbine/generator cycle with the steam turbine/generator cycle enables operation of the waste-to-energy plant at high pressure and high temperature resulting in greatly increased thermal cycle efficiency while eliminating superheater surfaces from the waste heat recovery boiler, thereby greatly reducing corrosion problems associated with waste heat recovery boilers.

Abstract: A waste-to-energy plant which is designed and operated to burn municipal waste (in 2) combines a high pressure steam turbine/generator cycle and a combustion turbine/generator cycle, wherein the exit gas from the combustion turbine (6) is utilized to superheat (in 4) high pressure steam (from 2) prior to entering the steam turbine (8). The combination of the combustion turbine/generator cycle with the steam turbine/generator cycle enables operation of the waste-to-energy plant at high pressure and high temperature resulting in greatly increased thermal cycle efficiency while eliminating superheater surfaces from the waste heat recovery boiler, thereby greatly reducing corrosion problems associated with waste heat recovery boilers.

Abstract: A method and apparatus for controlling pollution and flue gases from a boiler using municipal solid waste as a fuel. The flue gases pass through internal and external economizers before entering a reactor in which the gases are treated with lime or other reactant in slurry form to neutralize the acid components of the flue gases. The heat of the flue gases dries the products of the reaction and the excess reactants so that they may be separated from the flue gas in subsequent separator, which is a baghouse filter. The feed of the reactant to the reactor is modified in accordance with the concentration of acid constituents in the flue gas, and concurrently the operation of the economizers is modified to raise the temperature of the flue gas exiting the economizers when the feed of reactant is increased and vice versa. The temperature of the flue gas is increased by causing the feed water to bypass the external economizer in direct relation to the quantity of reactant fed to the reactor.