A steam power plant includes a first steam power plant, a second steam power plant, and an inter-unit. The first steam power plant includes a boiler, a high-pressure turbine, a first reheat line, a first feed water heater, and a high-pressure extraction steam line. The second steam power plant includes a boiler, a high-pressure turbine, a first reheat line, a first feed water heater, and a high-pressure extraction steam line. The inter-unit connected extraction steam line connects the high-pressure extraction steam line of the first steam power plant with the high-pressure extraction steam line of the second steam power plant.

A vertical heat recovery steam generator, the low-pressure stages of which are designed as a once-through system, having a condensate preheater with at least one condensate preheater heating surface, through which a flow medium flows and which is disposed in a hot gas channel through which hot gas flows, a low-pressure preheater with at least one low-pressure preheater heating surface through which the flow medium flows and which is disposed in the hot gas channel, and a low-pressure evaporator with at least one low-pressure evaporator heating surface through which the flow medium flows and which is disposed in the hot gas channel. The flow medium flows successively through the at least one low-pressure preheater heating surface and the at least one low-pressure evaporator heating surface in one pass and without additional pressure compensation.

Embodiments of the present disclosure include a system, method, and apparatus comprising a direct steam generator configured to generate saturated steam and combustion exhaust constituents.

A supply-water warming system includes a steam compression heat pump circuit, a heat recovery heat exchanger, a heat source fluid line in which heat source fluid flows in the heat recovery heat exchanger and the evaporator in this order, a water supply line in which supply water flows in the heat recovery heat exchanger and the condenser in this order, a refrigerant flow rate adjustment section controlled based on the superheat degree of gas refrigerant flowing into the compressor and configured to adjust a refrigerant flow rate, a supply water flow rate adjustment section controlled based on the tapping temperature of the supply water flowing out of the condenser and configured to adjust a supply water flow rate, and a control section configured to control the refrigerant flow rate adjustment section and the supply water flow rate adjustment section.

A steam turbine power plant utilizing high temperature high efficiency industrial heat pumps (IHP) to preheat boiler feedwater is disclosed. The typical extraction steam feedwater preheater is replaced by a plurality of series connected heat pumps that produce boiler feedwater by preheating pressurized condensate from a feedwater pump attached to a condensate receiver. A stack economizer extracts waste heat from boiler flue gas to provide a closed loop of hot source water to the heat pumps. The Heat Rate of the power plant will be reduced by approximately 7%. By using leaving condenser water as source water for the lower temperature stage heat pumps, some of the liberated high temperature source water can be diverted to a new boiler combustion air preheater. The combination of feedwater preheating heat pumps plus a boiler combustion air preheater will reduce the Heat Rate of the power plant by approximately 12%.

A method for starting a vertical forced-flow steam generator in a waste-heat steam generator, wherein feed water is fed to the forced-flow steam generator as working fluid, and there flows firstly through a feed-water preheater and then through an evaporator and is at least partly evaporated, wherein the partly evaporated working fluid is fed to a water separation system, in which non-evaporated working fluid is separated from evaporated working fluid and is collected, in which at least part of the non-evaporated working fluid is fed geodetically to the evaporator and, beginning from a certain quantity of accumulating non-evaporated working fluid, a remaining part is automatically removed from the water separation system. A corresponding device is for starting a vertical forced-flow steam generator according to the method.

A condensate and feedwater system includes: a deaerator circulation pump that returns condensate water flowing out from a deaerator to a part of a condensate line between a heater and the deaerator; an apparatus to be supplied with part of the condensate water flowing from the heater toward the deaerator, through a supply line branched from the condensate line; a supply line shutoff valve that switches between communication and interruption of the supply line; and a controller that controls opening/closing of the supply line shutoff valve and driving/stopping of the deaerator circulation pump. The controller closes the supply line shutoff valve from an open state at normal operation and at least temporarily drives the deaerator circulation pump from a stopped state at normal operation, in condenser throttling in which supply of extraction steam of a steam turbine to the heater and the deaerator is reduced as compared to that at normal operation and a deaerator water level control valve is closed.

A steam turbine power plant utilizing high temperature high efficiency industrial heat pumps (IHP) to preheat boiler feedwater is disclosed. The typical extraction steam feedwater preheater is replaced by a plurality of series connected heat pumps that produce boiler feedwater by preheating pressurized condensate from a feedwater pump attached to a condensate receiver. A stack economizer extracts waste heat from boiler flue gas to provide a closed loop of hot source water to the heat pumps. The Heat Rate of the power plant will be reduced by approximately 7%. By using leaving condenser water as source water for the lower temperature stage heat pumps, some of the liberated high temperature source water can be diverted to a new boiler combustion air preheater. The combination of feedwater preheating heat pumps plus a boiler combustion air preheater will reduce the Heat Rate of the power plant by approximately 12%.

There is provided a steam power plant which has a plurality of units and improves turbine plant efficiency in partial-load operation of the plurality of units in total. The steam power plant includes a first steam power plant having a boiler which generates steam, a high-pressure turbine which is driven with the steam that the boiler generates, a first reheat line which supplies the steam which is exhausted or extracted from the high-pressure turbine to the boiler, a first feed water heater to which part of the steam which is exhausted or extracted from the high-pressure turbine is supplied, and a high-pressure extraction steam line which supplies the part of the steam which is exhausted or extracted from the high-pressure turbine to the first feed water heater; a second steam power plant having a boiler which generates steam, a high-pressure turbine which is driven with the steam that the boiler generates, a first reheat line which supplies the steam which is exhausted or extracted from the high-pressure turbine to the boiler, a first feed water heater to which part of the steam which is exhausted or extracted from the high-pressure turbine is supplied, and a high-pressure extraction steam line which supplies the part of the steam which is exhausted or extracted from the high-pressure turbine to the first feed water heater; and an inter-unit connected extraction steam line which connects the high-pressure extraction steam line of the first steam power plant with the high-pressure extraction steam line of the second steam power plant.

A solar thermal power generation system is provided with a low-temperature heat collection device; a steam separator; a first hot water line that feeds water separated by a steam separator to the low-temperature heat collection device; a low-temperature heat storage device provided in the first hot water line; a high-temperature heat collection device; a steam turbine; a first main steam line that feeds superheated steam to the steam turbine; a second main steam line that branches from the first main steam line and joins with the first main steam line; a high-temperature heat storage device provided in the second main steam line; a low-temperature bypass line that bypasses the low-temperature heat collection device and; and a high-temperature bypass line that bypasses the high-temperature heat collection device and connects a steam outlet-side of the steam separator to an inlet-side of the high-temperature heat storage device.