A steam turbine pipe 1 of an embodiment includes: an upper half side main steam pipe 11 that leads steam to a steam turbine; an upper half side main steam control valve 30 that intervenes in the upper half side main steam pipe 11; and a post-valve drain pipe 31 that is connected to the upper half side main steam control valve 30 and leads drain to an outside. The steam turbine pipe 1 further includes: a shut-off valve 32 that intervenes in the post-valve drain pipe 31; and a branching pipe 60 that makes the post-valve drain pipe 31 on the side closer to the upper half side main steam control valve 30 than is the shut-off valve 32 communicate with the upper half side main steam pipe 11 between the upper half side main steam control valve 30 and a high-pressure turbine 200.

A steam turbine pipe 1 of an embodiment includes: an upper half side main steam pipe 11 that leads steam to a steam turbine; an upper half side main steam control valve 30 that intervenes in the upper half side main steam pipe 11; and a post-valve drain pipe 31 that is connected to the upper half side main steam control valve 30 and leads drain to an outside. The steam turbine pipe 1 further includes: a shut-off valve 32 that intervenes in the post-valve drain pipe 31; and a branching pipe 60 that makes the post-valve drain pipe 31 on the side closer to the upper half side main steam control valve 30 than is the shut-off valve 32 communicate with the upper half side main steam pipe 11 between the upper half side main steam control valve 30 and a high-pressure turbine 200.

A steam generator and a control method thereof are disclosed. The control method includes supplying water to a first chamber (C1), turning a heater (83) on, wherein power is supplied to the heater (83) to heat the heater (83) at a third temperature so as to generate steam, preventing overheating, wherein power supplied to the heater is cut at a first temperature so as to prevent overheating of the heater, and determining scale, wherein power supplied to the heater (83) is cut at a second temperature lower than the first temperature and then is resupplied after a predetermined time so as to prevent malfunction of the overheating prevention, wherein, when a time interval for the temperature of the heater to rise from the third temperature to the first temperature is within a predetermined time, determining scale is not performed.

A steam generator and a control method thereof are disclosed. The control method includes supplying water to a first chamber (C1), turning a heater (83) on, wherein power is supplied to the heater (83) to heat the heater (83) at a third temperature so as to generate steam, preventing overheating, wherein power supplied to the heater is cut at a first temperature so as to prevent overheating of the heater, and determining scale, wherein power supplied to the heater (83) is cut at a second temperature lower than the first temperature and then is resupplied after a predetermined time so as to prevent malfunction of the overheating prevention, wherein, when a time interval for the temperature of the heater to rise from the third temperature to the first temperature is within a predetermined time, determining scale is not performed.

A water-steam circuit of a power plant includes at least one low-pressure steam system and a reservoir for waste water from the water-steam circuit, wherein the reservoir has, in addition to at least one waste water feed line, a further heat supply from the water-steam circuit and a steam outlet which is connected via a waste steam pipe to the low-pressure steam system of the water-steam circuit. A method for cleaning waste water from a power plant having a water-steam circuit, wherein the waste water is conducted into a reservoir and, in addition to a steam fraction generated by automatic evaporation of waste water in the reservoir, a water fraction that is also produced is evaporated using energy from the water-steam circuit, and the entire steam mass flow is introduced into a low-pressure steam system of the power plant.

A water-steam circuit of a power plant includes at least one low-pressure steam system and a reservoir for waste water from the water-steam circuit, wherein the reservoir has, in addition to at least one waste water feed line, a further heat supply from the water-steam circuit and a steam outlet which is connected via a waste steam pipe to the low-pressure steam system of the water-steam circuit. A method for cleaning waste water from a power plant having a water-steam circuit, wherein the waste water is conducted into a reservoir and, in addition to a steam fraction generated by automatic evaporation of waste water in the reservoir, a water fraction that is also produced is evaporated using energy from the water-steam circuit, and the entire steam mass flow is introduced into a low-pressure steam system of the power plant.

A method for processing a liquid medium, wherein the medium to be processed is conducted through a liquid circuit and the medium to be processed is heated up in the liquid circuit with the aid of a heat exchanger. A liquid-vapor separation process is carried out in a separating device, and a liquid obtained in the liquid-vapor separation process is conducted into the heat exchanger as a heating medium.

A method for processing a liquid medium, wherein the medium to be processed is conducted through a liquid circuit and the medium to be processed is heated up in the liquid circuit with the aid of a heat exchanger. A liquid-vapor separation process is carried out in a separating device, and a liquid obtained in the liquid-vapor separation process is conducted into the heat exchanger as a heating medium.

A steam generator apparatus for generating steam from a feedwater inlet stream including impurities is disclosed. The apparatus includes a tubing circuit in communication with an inlet for receiving the feedwater stream, the tubing circuit having a substantially unrifled bore defined by a metal wall, and a heat source operable to deliver a heat flux to the feedwater stream through the metal wall of the tubing circuit, the heat flux being operable to cause evaporation of feedwater within the tubing circuit and to produce an outlet stream at an outlet of the tubing circuit, the outlet stream includes a steam portion and liquid phase portion, the steam portion being greater than about 80% of the outlet stream by mass, the steam portion providing sufficient cooling of the metal wall to maintain a wall temperature at less than a threshold temperature associated with safe operation of the steam generator apparatus.

A steam generator apparatus for generating steam from a feedwater inlet stream including impurities is disclosed. The apparatus includes a tubing circuit in communication with an inlet for receiving the feedwater stream, the tubing circuit having a substantially unrifled bore defined by a metal wall, and a heat source operable to deliver a heat flux to the feedwater stream through the metal wall of the tubing circuit, the heat flux being operable to cause evaporation of feedwater within the tubing circuit and to produce an outlet stream at an outlet of the tubing circuit, the outlet stream includes a steam portion and liquid phase portion, the steam portion being greater than about 80% of the outlet stream by mass, the steam portion providing sufficient cooling of the metal wall to maintain a wall temperature at less than a threshold temperature associated with safe operation of the steam generator apparatus.