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air preheater arranged automatic control automatic frequency control Babcock & Wilcox back-pressure boiler plant Brit British Electricity Authority burner capacity cent chromium coal combustion chamber compressor condenser connected cooling corrosion cost cylinder deposits discharge economiser effect efficiency engineering equipment exhibit feedwater firing flue fuel furnace gas turbine gases gear grate heater heating surface high-pressure increase industrial inlet installed instrument load London machine manufacture maximum mechanical mechanical stokers ment metal meter method Metropolitan-Vickers moisture motor normal nozzle obtained operation outlet output pass pass-out pipe piston power station production pulverised range refractory regulator reheat result shown in Fig speed spray stainless steel steam pressure steam temperature steam turbine stoker suitable sulphur sulphur trioxide superheater supply tests thermocouple thermostat tion tubes turbo-alternator unit velocity water level water-tube boilers welding