Disclosed herein is a supercritical CO.sub.2 generation system using plural heat sources, including: a pump configured to circulate a working fluid; plural heat exchangers configured to heat the working fluid using an external heat source; plural turbines configured to be driven by the working fluid heated by passing through the heat exchanger; and plural recuperators configured to exchange heat between the working fluid passing through the turbine and the working fluid passing through the pump to cool the working fluid passing through the turbine and heat the working fluid passing through the pump, in which the heat exchanger may include plural constrained heat exchangers having an emission regulation condition of an outlet end and plural heat exchangers without the emission regulation condition.

Disclosed herein is a supercritical CO.sub.2 generation system using plural heat sources, including: a pump configured to circulate a working fluid; plural heat exchangers configured to heat the working fluid using an external heat source; plural turbines configured to be driven by the working fluid heated by passing through the heat exchanger; and plural recuperators configured to exchange heat between the working fluid passing through the turbine and the working fluid passing through the pump to cool the working fluid passing through the turbine and heat the working fluid passing through the pump, in which the heat exchanger may include plural constrained heat exchangers having an emission regulation condition of an outlet end and plural heat exchangers without the emission regulation condition.

A method of controlling a turbine of an exhaust heat recovery system in which heat of exhaust gas evaporates a working fluid through a heat exchanger provided in an exhaust pipe and the working fluid is supplied to the turbine may include measuring an internal temperature of the heat exchanger, and rotating the turbine in a reverse direction when the measured internal temperature is a predetermined temperature or less.

The once-through boiler includes a water supply and at least an economizer, an evaporator superheater. No valves are provided between the economizer, the evaporator and the superheater. The high-pressure turbine includes a control valve. The method for low load operation of a power plant with a once-through boiler and a high pressure turbine includes providing a parameter indicative of the stable operation of the once-through boiler in once-through operation, and on the basis of this parameter adjusting the control valve in order to regulate the pressure within the economizer and evaporator and/or adjusting the temperature of the water supplied to the economizer.

A system reclaiming contaminated water includes a heat exchanger that receives the contaminated water and converts at least a portion of the contaminated water into steam and collects at least a portion of the contaminants within the heat exchanger. A thermal transfer fluid is heated by a heat exchanger is communication with a heat source. The heated fluid is circulated through the heat exchanger to heat the contaminated water. A steam engine is coupled to a generator, the steam engine receives the steam from the heat exchanger to drive the generator to provide power for the system. Steam exhausted from the steam engine is supplied to supplemental heat loads and then condensed in a modular condensing system. The collected contaminants are directed to an evaporation device to remove residual liquid.

A balanced grid valve for steam extraction from a multi-stage steam turbine comprising a first balancing chamber and a second balancing chamber which are configured to receive steam at high pressure through at least one duct. The balancing chambers are preferably in the form of annular grooves and are arranged at two different radial distances from the axis of the valve in order to reduce mechanical distortion of the valve.

A balanced grid valve for steam extraction from a multi-stage steam turbine comprising a first balancing chamber and a second balancing chamber which are configured to receive steam at high pressure through at least one duct. The balancing chambers are preferably in the form of annular grooves and are arranged at two different radial distances from the axis of the valve in order to reduce mechanical distortion of the valve.

An Air Separation Unit is disclosed which is thermally integrated into a coal fired oxy boiler power plant. The Air Separation Unit has a Dryer with a dryer heater, wherein an extraction line connects the steam extraction port to the dryer heater. A drain line of the dryer heater then fluidly connects the regeneration heater to a point of a Rankine steam cycle fluidly within the condensate system.

The present application provides a combined cycle system. The combined cycle system may include a heat recovery steam generator, a feedwater source positioned upstream of the heat recovery steam generator, a desuperheater positioned downstream of the heat recovery steam generator, a first extraction from the heat recovery steam generator to the desuperheater, and a second extraction from upstream of the heat recovery steam generator to the desuperheater.

The present invention provides a turbine shaft bearing apparatus, comprising two axially spaced, inlet side and outlet side bearings for providing support to a turbine shaft to which are connected a plurality of turbine wheels such that the turbine shaft, the two spaced bearings, and the plurality of turbine wheels are all coaxial, wherein the outlet side bearing is protected from overheating by motive fluid expanded by one or more of the plurality of turbine wheels or stages by a solid bearing housing which surrounds the outlet side bearing which is supported and provided with a conduit through which a lubricating medium for lubricating said outlet side bearing is supplied from a port external to said turbine. The present invention is also directed to a single turbine module, comprising a plurality of axially spaced turbine wheels, each of which constitutes one expansion stage of said turbine module, being connected to a common turbine shaft and coaxial therewith; an inlet through which motive fluid vapor is introduced to a first stage of said turbine wheels; a structured bleeding exit opening formed in an outer turbine casing of the turbine module; and a passage defined between two of the turbine wheels and in fluid communication with the bleeding exit opening, wherein expanded motive fluid vapor is extracted through said structured bleeding exit opening and is supplied to a heat exchange component, for heating the motive fluid condensate.