A waste heat regeneration system for a vehicle having a vehicle engine actuated by a start-stop switch includes Rankine cycle circuit, a motor generator, a by-pass circuit and a control device. The Rankine cycle circuit includes a pump, a boiler heating the heat medium by heat exchanging with waste heat generated by the vehicle engine, an expansion device and a condenser. The by-pass circuit is connected to the Rankine cycle circuit at the upstream and downstream sides of the condenser and the communication of the heat medium is openable and closable therethrough. When the start-stop switch of the vehicle engine is turned off, the control device controls the by-pass circuit to communicate the heat medium therethrough and keeps controlling of the rotational speed of the motor generator until pressure difference between the upstream and downstream of the expansion device is decreased to a predetermined level, and then stops the control.

Waste heat regeneration system

A cascade power system and a method are disclosed for using a high temperature flue gas stream to directly or indirectly vaporize a lean and rich stream derived from an incoming, multi-component, working fluid stream, extract energy from these streams, condensing a spent stream and repeating the vaporization, extraction and condensation cycle.

Cascade power system

A composition comprising at least 50 weight % of a first particulate electroactive material and 3-15 weight % of a carbon additives mixture comprising elongate carbon nanostructures and carbon black, wherein: the elongate carbon nanostructures comprise at least a first elongate carbon nanostructure material and a different second elongate carbon nanostructure material; and the elongate carbon nanostructures : carbon black weight ratio is in the range 3 : 1 to 20 :1.

Composition of si/c electro active material

A solar thermal power plant 20 comprises a solar radiation receiver 28 mounted on a tower 22 surrounded by a heliostat field 24 to receive solar radiation reflected by heliostats 26 forming the heliostat field 24. The power plant 20 comprises a power generation circuit 30 including a steam turbine for driving an electrical generator to produce electrical power, and water in the power generation circuit 30 is capable of being heated directly by solar radiation reflected onto the solar radiation receiver 28 by the heliostat field 24 to generate steam to drive the steam turbine. The power plant 20 also comprises an energy storage circuit 36 including a thermal energy storage fluid, such as molten salt, which is capable of being heated directly by solar radiation reflected by the heliostat field 24. A heat exchanger 44 is also provided for recovering thermal energy from the thermal energy storage fluid in the energy storage circuit 36; the recovered thermal energy may then be used to generate steam to drive the steam turbine.

Solar thermal power plant

Methods and systems for converting waste heat from cement plant into a usable form of energy are disclosed. The methods and systems make use of two heat source streams from the cement plant, a hot air stream and a flue gas stream, to fully vaporize and superheat a working fluid stream, which is then used to convert a portion of its heat to a usable form of energy. The methods and systems utilize sequential heat exchanges stages to heat the working fluid stream, first with the hot air stream or from a first heat transfer fluid stream heated by the hot air stream and second with the flue gas stream from a second heat transfer fluid stream heated by the hot air stream.

Method and system for converting waste heat from cement plant into a usable form of energy

The invention relates to a waste heat steam generator of a gas fired and steam powered generator. Said generator comprises a waste heat boiler to which exhaust gas of a gas turbine can be supplied. Said steam generator also comprises at least one evaporator which is located in the waste heat boiler and is used to produce process steam for a steam turbine. According to the invention, flue gas from a heating device can be supplied to the waste heat boiler and at least part of said flue gas can be extracted at at least one point of the waste heat boiler and redirected back to the inlet of said waste heat boiler.

Waste heat steam generator

The invention relates to a solar thermal power plant (1) comprising a solar collector steam generator unit (2) for generating steam, a solar collector steam superheater unit (4), downstream of the solar collector steam generator unit (2), for superheating the steam, and a steam turbine (40) which is connected to an outlet of the solar collector steam superheater unit (4) via a steam conduit system (13), superheated steam being supplied to the steam turbine when in use The solar thermal power plant (1) comprises an intermediate storage (20) which is connected to the steam conduit system (13) at least in a first high-temperature storage connecting point (HA1) interposed between the solar thermal steam superheater unit (4) and the steam turbine (40) to remove steam superheated in a storage mode from the steam conduit system (13) and which comprises a heat reservoir (22, 23, 24) in which thermal energy is drained from the steam fed into during the storage mode and is accumulated and the stored thermal energy is given off to the steam in an extraction mode, said steam being fed to the steam conduit system (13) from the intermediate storage (20) The intermediate storage is connected to a condenser (65) and/or a relaxation device (89) of the solar thermal power plant (1) in a low-temperature storage connecting point (NA3) The invention also relates to a method for operating said solar thermal power plant (1)

Solar thermal power plant and method for operating a solar thermal power plant

A method for operating a waste heat steam generator including an evaporator, an economizer having a number of economizer heating surfaces, and a bypass line connected on the flow medium side in parallel with a number of economizer heating surfaces is provided. The method makes possible higher operational safety and reliability in the control of the waste heat steam generator. For this purpose, a parameter that is characteristic of the thermal energy fed to the waste heat steam generator is used to control or regulate the flow rate of the by-pass line.

Method for operating a waste heat steam generator

A method for operating a continuous flow steam generator with an evaporator heating surface is provided. A target value for a supply water mass flow is fed to a device for adjusting the supply water mass flow. In order to improve the quality of a predictive supply water or mass flow control and to maintain the enthalpy of the flow medium at the evaporator outlet particularly stable especially when load changes occur, a correction factor is taken into consideration during production of the target value for the supply water mass flow. The correction factor is a characteristic of the temporal derivative of enthalpy or the density of the flow medium at the input of one or more heating surfaces.

Method for operating a continuous flow steam generator

The operating method is used for continuous flow steam generators with an evaporator heating surface (4), a preheater (2) on the flow medium side of the surface, a device for setting the mass of feed water flowing through the generator and a control (1) for ensuring this value. The mass of water is adjusted according to the steam production desired and is controlled by measuring the density of water at the preheater inlet.

Frank Thomas

Papers

Waste heat steam generator

Solar thermal power plant and method for operating a solar thermal power plant

Method for operating a waste heat steam generator

Method for operating a continuous flow steam generator

Method for operating of an once-through steam generator