Abstract: The present disclosure is directed to a method and a system employing a gas introduced into the system as a startup operation for a natural circulation vertical heat recovery steam generator (HRSG) to initiate natural circulation of a fluid within the system. More specifically, the present disclosure is directed to a method and a system employing a gas introduced into an outlet header of an evaporator, into an outlet header of an evaporator and into one or more risers near the outlet header of the evaporator, or into one or more risers near the outlet header of the evaporator, to initiate natural circulation of a fluid in a desired system direction from the evaporator directly into a steam drum.

Abstract: There are provided a generator internal pipe section that extends in the horizontal direction inside a steam generator; and a communication pipe section that is connected to the generator internal pipe section and is provided with a communication path, wherein one end of the communication path is connected to the pipe path at an upper end of a cross-section perpendicular to the flow direction of the cooling water in the pipe path and the other end of the communication path is positioned at the downside in the vertical direction in relation to one end of the communication path, and wherein one end side and the other end side of the communication path are connected at a position existing at the upside in the vertical direction in relation to one end.

Abstract: The steam generator includes: a water supply channel for supplying a secondary coolant to a tube bundle outer casing with the secondary coolant being isolated from the recirculating secondary coolant; a recirculating secondary coolant injection section for injecting the recirculating secondary coolant toward a high temperature-side heat transfer tube bundle; and a supplied secondary coolant injection section for injecting the secondary coolant supplied from the water supply channel toward a low temperature-side heat transfer tube bundle. The recirculating secondary coolant injection section and the supplied secondary coolant injection section being disposed in the tube bundle outer casing on the side toward the tube plate. The recirculating secondary coolant injection section and the supplied secondary coolant injection section are defined such that, of the secondary coolant and the recirculating secondary coolant, the coolant having a higher relative flow rate than the other flows at a lower velocity.

Abstract: A generating system is presented that includes a steam generator, a separator coupled to the generator, a supply providing feed water, a start-up system coupled to and receiving the feed water, and a recirculation system coupled to the start-up system. The steam generator operates in a plurality of operating modes. In one mode the steam generator generates a flow of steam and fluid. The separator separates the flow into components of steam and fluid. The recirculation system receives the feed water from the start-up system and provides a required flow to the steam generator during at least one mode. The recirculation system includes an ejector. The ejector induces a portion of the fluid from the separator into the recirculation system, mixes the induced fluid with the feed water to provide a recirculation flow, and the recirculation system provides the required flow to the steam generator including the recirculation flow.

Abstract: A boiler for generating steam has a substantially enclosed housing configured to contain an amount of water to be boiled, the housing having one or more thermally conductive sidewalls which form a substantially enclosed water chamber and a reflection chamber, the reflection chamber including a closed top portion and a opening through which light rays may pass, the opening being vertically disposed below the top portion of the chamber so that the reflection chamber may trap heat, wherein at least one of the thermally conductive sidewalls is disposed so as to divide the water chamber from the reflection chamber. The boiler also include a support structure attached to or integral with the housing, which support structure supports the housing in a substantially fixed position during use of the boiler, and reflecting means for reflecting sunlight through the opening of the reflection chamber and onto a focal point on one or more inner surfaces of the top portion of the reflection chamber.

Abstract: A steam ejection device including a steam generator for generating steam by heating water; a steam eject port for discharging the steam generated in the steam generator; and a steam-guiding portion for delivering the steam from the steam generator to the steam eject port, and the steam ejection device further including a steam-heating block for heating, right before the steam eject port, the steam guided via the steam-guiding portion.

Abstract: A steam generator comprises a distribution means, positioned between the shell and the wrapper in the annular downcomer region of the steam generator, for uniformly mixing the colder feedwater with the warmer recirculating water in the downcomer region of the steam generator so that the colder feedwater is not introduced directly into any steam regions of the steam generator and does not contact any pressure boundaries for preventing water hammer and thermal shock to the steam generator. The distribution means has a downwardly directing means for discharging the substantially evenly distributed feedwater from the distribution means into the downcomer region in a descending direction and away from any pressure boundaries for minimizing flow resistance and for preventing thermal shock to the pressure boundaries.

Abstract: An evaporating apparatus comprising a high temperature side evaporator and a low temperature side evaporator connected in series in a flowing direction of a heat source, a first and second pipe line for directing fluid being evaporated therethrough, and an ejector having a suction inlet and a discharge outlet of drive steam and an induction port of steam being sucked, wherein the first pipe line is linked through the high temperature side evaporator to the suction inlet of the ejector, and the second pipe line is branched from the first pipe line at the upstream side of the hot temperature side evaporator, and linked through the low temperature side evaporator to the induction port of the ejector.

Abstract: An apparatus comprises a separator (1) and a jet pump (2) with a feed valve (6) connected in parallel through a bypass pipeline (8). An axially movable hollow cylindrical member (14) having a movable nozzle (17) is installed in a static pressure chamber of the jet pump 2 and a fixed nozzle 19 is installed concentrically with the movable nozzle (17). Overflow openings (18) are provided in the walls of the hollow cylindrical member (14).

Abstract: Steam generating apparatus and methods wherein a liquid is recirculated within a boiler by use of a constant speed dynamic feed water pump acting both to feed the boiler and to effect recirculating therein by a jet pump with its jet nozzle in liquid flow series with the dynamic pump. The jet pump also receives water from a steam drum for recirculation through the boiler. In the event of excess feed water supply to the boiler a step-function level control for the steam drum bypasses liquid to a condenser. A second jet pump acts to utilize excess feed water to supply cool water from the condenser well under pressure to the dynamic pump so that no water is bypassed to the condenser under on-design operating conditions. For waste heat recovery to provide shaft power automatically with simplified controls.

Abstract: In a method for condensate recirculation of at least two condensate flows at different pressures and different temperatures in a closed circuit of a remote steam system having a high-pressure remote steam conduit, the two condensate flows are to be fed into a common condensate recirculation conduit without externally supplied auxiliary energy and without energy losses. To this end, the procedure is that the pressure and the temperature in the condensate recirculation conduit are between the pressures and the temperatures of the condensate flows and that the condensate flow having the lower pressure is pumped in the condensate flow having the higher pressure into the condensate recirculation conduit, and the condensate flows are mixed together before their entry into the condensate recirculation conduit.

Abstract: The steam generator is provided with a vertical cylindrical enclosure having a bundle of U-shaped tubes therein connected to inlet and outlet collectors through a tube plate at the bottom. An inner casing surrounding the tubes defines an annular chamber which communicates with the tube chamber adjacent the tube plate. A heater is provided about the outlet portion of the tubes within the tube chamber. An ejector pump supplying a secondary fluid is located in the annular chamber adjacent the heater for pumping secondary fluid through the heater. A portion of the heated secondary fluid is recirculated through the pump and the remainder is directed into the tube chamber. Vapor phase separators are provided on top of the inner casing to allow the passage of the vapor phase through an outlet in the enclosure while returning the liquid phase to the annular chamber.

Abstract: An energy saving device for use in connection with a heat-insulated storage vessel in a domestic hot-water system is disclosed. When there is no demand for hot water, water contained in the vessel is heated in an electric through-flow heater and circulated by gravity, with the heated water rising into the vessel through an outflow pipe of the vessel and the water to be heated being supplied to the heater from the lower portion of the vessel through a jet pump, a vortex diode and a valve which are connected in series between the through-flow heater and a water inlet pipe to the vessel. As soon as a hot water faucet is opened, water from a supply enters the jet pump, and the jet pump causes water to flow through the water inlet pipe into the lower portion of the vessel. At the same time water of medium temperature from the upper portion of the vessel flows through the heater and is brought to high temperature before flowing to the faucet.

Abstract: Forced circulation steam generators of any design may increase effective heat absorption and steaming capacity by maintaining bulk boiler water temperature at or near the saturation temperature for the operating pressure, while the main boiler heat transfer process is substantially reserved for the evaporative function. The acceleration of gas-to-liquid energy transfer across boiler heating surfaces occurs when bulk boiler water temperature is maintained at or near saturation, and significant degrees of nucleate boiling and nucleate film boiling heat transfer exist while stable steam film boiling is limited.In one form of the invention, recirculating boiler water is discharged from a circulating pump through an exterior ejector-type contact heat exchanger to mix with recirculated heating steam before being returned to the boiler. In this adaptation bulk boiler water temperature may be closely controlled by regulating the quantity of heating steam admitted into the ejector heat exchanger.

Abstract: A jet pump is provided in the downcomer of a natural circulation fossil fuel burning vapor generator to enhance circulation in the vaporizer circuits of the vapor generator. A driving fluid pump is adapted to introduce liquid taken from the drum as driving fluid for the jet pump, and the liquid passing through the downcomer acts as driven fluid for the jet pump.

Abstract: A high-pressure steam generator, particularly for use in a pressurized-water coolant nuclear reactor installation, has a feed water inlet connection provided with a flow choke, such as a flow restricting orifice, through which the normal flow of feed water can pass to the steam generator with little impedance. In the event the pipe line supplying the feed water to the input connection accidentally fails and opens to the atmosphere, the choke becomes effective to very substantially reduce the flow rate of the reversely flowing water through the connection, which then occurs under the high steam pressure of the steam generator. This reduces the forces on the generator's internal construction in the event of such an accident.