A coal fired Oxy boiler power plant with a condensate system, combustion system and post combustion CO2 capture plant configured and arranged to remove CO2 from a flue gas stream generated in the combustion system. The condensation system includes a plurality of serial low pressure heaters arranged in flow series downstream of the pump and at least one parallel low pressure heater arranged fluidly parallel to at least one of the serial low pressure heaters. Flue Gas Heat Recovery System, Flue Gas Condenser and Gas Processing unit are thermally integrated into the condensate system.

A coal fired Oxy boiler power plant with a condensate system, combustion system and post combustion CO2 capture plant configured and arranged to remove CO2 from a flue gas stream generated in the combustion system. The condensation system includes a plurality of serial low pressure heaters arranged in flow series downstream of the pump and at least one parallel low pressure heater arranged fluidly parallel to at least one of the serial low pressure heaters. Flue Gas Heat Recovery System, Flue Gas Condenser and Gas Processing unit are thermally integrated into the condensate system.

An apparatus and method for recovery of waste heat in a boiler system, wherein heat from the low pressure steam in the feed water tank, which otherwise would be lost through dissipation, is used for other applications. Particularly, the waste heat energy recovered in the form of low pressure steam can be used to heat make-up water for the boiler system.

The steam boiler system comprises a steam boiler comprising a burner and a chimney for exhausting flue gases, a feedwater line for leading feedwater to said steam boiler for producing steam, a steam line leading from said steam boiler to at least one application heat exchanger for feeding steam to said application heat exchanger, said application heat exchanger for heating an application fluid, and a condensate line leading away from said application heat exchanger for recuperating condensate from said application heat exchanger. An economizer heat exchanger is provided in said chimney, wherein at least one of said condensate return line and said feedwater line circulates through said economizer heat exchanger for allowing at least one of said condensate and said feedwater to be in heat exchange relationship with the flue gases for simultaneously cooling the flue gases while heating at least one of the condensate and the feedwater.

The steam boiler system comprises a steam boiler comprising a burner and a chimney for exhausting flue gases, a feedwater line for leading feedwater to said steam boiler for producing steam, a steam line leading from said steam boiler to at least one application heat exchanger for feeding steam to said application heat exchanger, said application heat exchanger for heating an application fluid, and a condensate line leading away from said application heat exchanger for recuperating condensate from said application heat exchanger. An economizer heat exchanger is provided in said chimney, wherein at least one of said condensate return line and said feedwater line circulates through said economizer heat exchanger for allowing at least one of said condensate and said feedwater to be in heat exchange relationship with the flue gases for simultaneously cooling the flue gases while heating at least one of the condensate and the feedwater.

A conduit is preheated with steam having steam drain valve(s) therein open to allow draining and control valve(s) therein closed to prevent steam downstream flow. A gas may backfill the conduit from a downstream gas source to further preheat, and gas drain valve(s) may be provided to drain the gas. A predicted exit temperature of the steam or gas for a respective drain valve is calculated using a linear regression model based on initial temperature and pressure of the steam or gas and a Joule-Thompson cooling effect for the steam or gas at the respective drain valve. The preheating is stopped for the respective section of conduit when one or a combination of the predicted exit temperatures is greater than or equal to a respective required exit temperature of the steam or gas at a respective drain valve. The system sequentially ensures adequate preheating of sections of the conduit.