Patent
Thermal energy storage by means of reversible heat pumping
TLDR
In this paper, a method is described for storing the offpeak electrical output of an electricity generating plant in the form of heat by using it to raise the temperature level of a quantity of stored heat retention material and recalling said stored heat during periods of peak power demand.Abstract:
A method is described for storing the offpeak electrical output of an electricity generating plant in the form of heat by using it to raise the temperature level of a quantity of stored heat retention material and recalling said stored heat during periods of peak power demand in the form of electrical power During low power demand periods hot water is drawn from a hot water storage means and cooled by flashing it at successively lower pressures The cold condensate is sent to a cold water storage means while the various flash vapors are fed to appropriate stages of a steam compressor driven by excess power drawn from the electricity generating station The steam which has been compressed by means of the excess electrical power is directed to heat exchanger means where it is used to heat a low vapor pressure (LVP) thermal energy retention material flowing from cold to hot storage means through the heat exchanger means By the practice of this invention, heat is transferred, by means of the steam compressor powered by excess electrical power, from hot water (˜ 210° F) to the LVP material raising its temperature from a cold storage temperature of about 190°-300° F to a hot storage temperature of about 450°-600° F The hot LVP material is stored at atmospheric pressure preferably under an inert gas atmosphere During peak energy demand periods, the process is reversed and the hot LVP material is used to generate steam which runs a turbine thereby producing electrical power from a generatorread more
Citations
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Journal ArticleDOI
Electrothermal energy storage with transcritical CO2 cycles
TL;DR: In this paper, a transcritical electrothermal energy storage (ETES) system is proposed for large scale electrical energy storage and the role of storage in the integration of renewable intermittent generation such as wind energy into the electricity network.
Journal ArticleDOI
Conceptual design of a thermo-electrical energy storage system based on heat integration of thermodynamic cycles – Part A: Methodology and base case
TL;DR: In this article, the authors proposed different energy integration schemes for a methanol absorption based acid gas removal process, namely the Rectisol® process specifically designed for the selective removal of H2S and CO2 from coal derived syngas.
Patent
Thermoelectric energy storage system and method for storing thermoelectric energy
TL;DR: In this paper, a system and method for thermoelectric energy storage is described, where the working fluid undergoes transcritical cooling during charging and transcritical heating during discharging cycle as it exchanges heat with the thermal storage medium.
Journal ArticleDOI
Thermoeconomic design optimization of a thermo-electric energy storage system based on transcritical CO2 cycles
TL;DR: In this paper, the conceptual design of a thermo-electric energy storage (TEES) system for large scale electricity storage is discussed by showing the results of the thermoeconomic optimization of three different system configurations that were identified in previous works.
Patent
Systems and methods for energy storage and recovery using compressed gas
TL;DR: In this article, the authors describe methods and systems for the storage and recovery of energy using open-air hydraulic-pneumatic accumulator and intensifier arrangements that combine at least one accumulator with at least two intensifiers in communication with a high-pressure gas storage reservoir on a gas-side of the circuits and a combination fluid motor/pump, coupled to a combination electric generator/motor on the fluid side.
References
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Patent
Method of converting low-grade heat energy to useful mechanical power
Cecil G. Martin,Paul F. Swenson +1 more
TL;DR: In this paper, a method of operating a vapor cycle engine where a vaporizable fluid is circulated in a closed loop serially through a first heat source, a second Heat source, an expansion vapor engine, a condenser, and back to the first Heat Source is presented.
Patent
Thermal energy storage and utilization system
TL;DR: The power output from a nuclear power plant or fossil fuel power plant operating under constant reactor (or furnace) and boiler conditions is varied by regulating the rate of turbine extraction steam and primary high pressure steam used to heat boiler feed water (BFW) as mentioned in this paper.
Patent
System and method for operating a boiling water reactor-steam turbine plant
TL;DR: In this article, a turbine follow control system for a boiling water reactor-steam turbine plant includes an electrical reference system which determines the reactor operating level through a reactor control system and operates turbine steam valves and steam bypass valves electrohydraulically to control the stem throttle pressure.
Patent
Steam power stations
TL;DR: In this article, a steam power station includes an accumulator for storing heat drawn from the operating steam cycle during slack operating periods when the power network demand on the station is low, and restoring the heat to the steam cycle at peak or high demand periods, to adapt the station to a variable demand network.
Patent
Method and means for generating electricity and vaporizing a liquid in a thermal power station
TL;DR: A thermal power plant operates with a varying production of electric power, and the excess heat generated in the plant is used for evaporating a liquid in a multi-stage vaporizing process as discussed by the authors.