Patent ID: 8443606
Filing Date: 2013-05-21
Classification: F22B,Y02P

Abstract:
1. A dual pressure boiler and steam turbine system comprising: a top furnace for producing high pressure steam, a high pressure superheater fluidically connected to the top furnace for superheating the high pressure steam, and a high pressure steam turbine for receiving steam from the superheater and producing a flow of exhaust steam; a bottom furnace comprising a low pressure natural circulation steam generating system for producing low pressure steam; a first feedwater heater for preheating feedwater with the low pressure steam from the bottom furnace; a reheater for reheating the flow of exhaust steam from the high pressure steam turbine; a low pressure steam turbine for receiving the reheated steam and producing extraction steam; and a second feedwater heater for preheating the feedwater with the extraction steam from the low pressure steam turbine.