6 results about "Cryogenic energy storage" patented technology

The present invention relates to cryogenic energy storage systems for storing using high-grade heat-of-compression. The system includes a liquefaction sub-system (100) and thermal energy storage device (300). The liquefaction sub-system (100) includes a first compressor (102), a first, second and third heat exchanger (104, 116, 112) and second compressor (114). The first and second heat exchangers (104, 116) are configured to transfer the high-grade heat of compression from the first and second compressors (102, 114) respectively to the thermal energy storage device (300). The third heat exchanger (112) is configured to recuperate the low-grade heat of compression from the second compressor (114) back into the second compressor (114) enabling the second compressor (114) to generate high-grade heat of compression. Further systems use compressors (124) and expanders (122). Further systems include power recovery sub-systems (400). The present disclosure also relates to methods of heat-of-compression storage in cryogenic energy storage systems.

A method for exhaust aftertreatment of an internal combustion engine (10) with an exhaust system (20) in which a NOx storage catalyst (28) with a low-temperature storage component (48) made of cerium oxide and a high-temperature storage component (52) made of barium carbonate as well as an SCR catalyst (34) and / or particulate filter (30) with an SCR coating (32) arranged downstream of the NOx storage catalyst (28) in the flow direction of an exhaust gas of the internal combustion engine (10), comprising the following steps: - Modeling the loading state of the NOx storage catalyst (28), wherein - the charging of the low-temperature storage component (48) is determined by a first model for the charging of the low-temperature storage component (48), and - the loading of the high-temperature storage component (52) is determined by a second model for the loading of the high-temperature storage component (52), - Regenerating the NOx storage catalyst (28) by introducing unburned hydrocarbons into the exhaust system (20) of the combustion engine (10) when the high-temperature storage component (48) has reached a defined loading level and the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has an operating temperature at which selective catalytic reduction of nitrogen oxides is possible, wherein - depending on whether the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has an operating temperature at which selective catalytic reduction of nitrogen oxides is possible, at least two threshold values ​​are used, wherein - a first threshold value is provided at which a regeneration of the NOx storage catalyst (28) is carried out when the SCR catalyst (34) or the particulate filter (30) with the SCR coating (32) has reached its operating temperature and wherein - a second threshold is provided at which regeneration of the NOx storage catalyst (28) takes place independently of the temperature of the SCR catalyst (34) or the particulate filter (30) with SCR coating (32).

The utility model discloses a kind of based on liquid air energy storage's cogeneration unit start-stop peak shaving system, including the coal-fired generating unit for producing electric energy, the electric energy of the coal-fired generating unit for consumption is changed into heat and liquid air storage unit and the civil heating unit for carrying out external heating using the heating extraction steam provided by the coal-fired generating unit and the surplus compressed heat provided by liquid air energy storage unit, the high-pressure equipment of liquid air energy storage unit is connected at the power generation end of the coal-fired generating unit, and the civil heating unit is connected with liquid air energy storage unit and the coal-fired generating unit respectively.The utility model is based on guaranteeing the maximum heating load of external network of cogeneration unit, to configure minimum capacity liquid air energy storage system to realize start-stop peak shaving, both can guarantee heating, and can realize start-stop peak shaving function, simultaneously with minimum capacity configuration, reduce system redundancy, reduce initial investment.

A gas heat supplement and heat storage power generation system comprises a low-temperature energy storage system, a high-temperature energy storage system, a molten salt energy storage device, a counterflow heat exchanger, a compressor, an expander, a generator, a boiler combustion heating system and connecting pipelines therebetween; the boiler combustion heating system comprises a combustion chamber and a boiler heating system in communication with the combustion chamber; the boiler heating system mainly comprises a heating module, and a heat absorption pipeline is arranged in the heating module; the expander and the heat absorption pipeline are connected in series and are connected in parallel with the compressor branch between one end of a steam passage of the counterflow heat exchanger and a port A of the low-temperature energy storage system; the other end of the steam passage of the counterflow heat exchanger is in communication with a port B of the high-temperature energy storage system; and both ends of a molten salt passage of the counterflow heat exchanger are in communication with the molten salt energy storage device. The design of the boiler heating system is added, the power generation efficiency is improved, and the commercial implementation is easy.

The present invention provides an energy recovery subsystem (10) for a cryogenic energy storage system (1), the subsystem comprising: an evaporator; a first heat exchanger (21) for transferring thermal energy from a heat conduction fluid (6) to a working fluid (5); one or more expansion stages (30) for extracting work from the working fluid (5); a recuperator (40) for transferring thermal energy from one working fluid (5) to another; and the working fluid The conduit (100) of the first configuration for passing through (5) and the conduit (200) of the second configuration which is connectable to the thermal energy storage device (TESD) (3) and connected to the first heat exchanger (21) for passing the heat conduction fluid (6) through the first heat exchanger (21), the conduit (100) of the first configuration sequentially connects the evaporator (14), the recuperator (40), the first heat exchanger (21), the second recuperator (40), and one or more expansion stages (30).

The application discloses a kind of photothermal heat supplement heat storage power generation systems, including low temperature energy storage system, high temperature energy storage system, fused salt energy storage device, first counterflow heat exchanger, compressor, expander, generator, photothermal heat supplement system and the connecting pipeline between them;The inlet of the compressor and the outlet of expander are communicated with the port A of low temperature energy storage system;The photothermal heat supplement system is installed between the inlet of the expander and the steam passage of first counterflow heat exchanger, and the outlet of the compressor is also communicated with the end of the steam passage of first counterflow heat exchanger;The other end of first counterflow heat exchanger steam passage is communicated with the port B of high temperature energy storage system;Two ends of the fused salt passage of the first counterflow heat exchanger are communicated with fused salt energy storage device.The application improves the power generation efficiency by adding the design of photothermal heat supplement system, and is easy to commercial implementation.