# US 2014/0360191 A1 · Energy storage apparatus for the preheating of feed water > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360191 A1 - Document ID: US20140360191A1 - Status: Published application - Kind: A1 - Application number: 14/292,843 - Filed: 2014-05-31 - Published: 2014-12-11 - Earliest claimed: 2013-06-05 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: Christian Brunhuber; Carsten Graeber; Gerhard Zimmermann - Web page: https://patentgrep.com/patent/US20140360191A1 ## CPC - F01B 25/00: Regulating, controlling or safety means (controlling combustion engines F02D) - F01K 3/00: Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein (regenerating exhaust steam F01K19/00) - F01K 7/22: the turbines having inter-stage steam heating - F01K 7/40: Use of two or more feed-water heaters in series - F01K 23/02: the engine cycles being thermally coupled - Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] - F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C) - F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An energy storage apparatus for the storage of thermal energy is provided, with a charging circuit, having a compressor, a heat store and an expansion turbine, the compressor connected on the outlet side to the inlet of the expansion turbine via a first line for a first working gas, and the heat store inserted into a second line, and the first line connected to a first heat exchanger, in which the first line and the second line are coupled thermally, and, furthermore, having a discharge circuit which has a water/steam circuit equipped with a steam generator and which has at least one feed water preheater preceding the steam generator with respect to the direction of flow of the water in this water/steam circuit, and thermal coupling between the charging circuit and discharge circuit achieved by the feed water preheater, in particular achieved solely by the feed water preheater. ## Claims ### Claim 1 An energy storage apparatus for the storage of thermal energy, with a charging circuit, comprising a compressor, a heat store and an expansion turbine, the compressor being connected on the outlet side to the inlet of the expansion turbine via a first line for a first working gas, and the heat store being inserted into a second line , and the first line being connected to a first heat exchanger, by which the first line and the second line are coupled thermally, and, a discharge circuit which comprises a water/steam circuit which is equipped with a steam generator and which has at least one feed water preheater preceding the steam generator with respect to the direction of flow of the water in this water/steam circuit, wherein thermal coupling between the charging circuit and discharge circuit being achieved by the feed water preheater. ### Claim 2 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the feed water preheater is designed as a heat exchanger which is likewise coupled thermally to a low-temperature steam line. ### Claim 3 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the feed water preheater is designed as a heat exchanger which is likewise coupled thermally to a medium-temperature steam line. ### Claim 4 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the feed water preheater is designed as a heat exchanger which is likewise coupled thermally to a high-temperature steam line. ### Claim 5 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the feed water preheater comprises at least two, heat exchangers which are in each case connected thermally to a steam line which can transmit heat at a different temperature level. ### Claim 6 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the compressor and the expansion turbine are arranged on a common shaft. ### Claim 7 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the compressor and the expansion turbine are arranged so as to be decoupled mechanically from one another. ### Claim 8 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the compressor and the expansion turbine are connected via an essentially closed line circuit for the first working gas which comprises the first line. ### Claim 9 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the first line comprises an electrically operated heating device. ### Claim 10 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein additional electrical heating is inserted into the charging circuit upstream of the heat store. ### Claim 11 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein the heat store contains a porous storage medium which comprises sand, gravel, rock, concrete, water, salt and/or thermal oil. ### Claim 12 (depends on 1) The energy storage apparatus as claimed in claim 1, further comprising, a steam turbine plant capable of being operated by steam from the water/steam circuit inserted into the discharge circuit. ### Claim 13 (depends on 1) The energy storage apparatus as claimed in claim 1, wherein thermal coupling between the charging circuit and discharge circuit is achieved solely by the feed water preheater. ### Claim 14 (depends on 2) The energy storage apparatus as claimed in claim 2, wherein the low-temperature steam line emanates from a low-pressure steam part of a steam turbine connected to the water/steam circuit. ### Claim 15 (depends on 3) The energy storage apparatus as claimed in claim 3, wherein the medium-temperature steam line emanates from a medium-pressure steam part of a steam turbine connected to the water/steam circuit. ### Claim 16 (depends on 4) The energy storage apparatus as claimed in claim 4, wherein the high-temperature steam line emanates from a high-pressure steam part of a steam turbine connected to the water/steam circuit. ### Claim 17 (depends on 5) The energy storage apparatus as claimed in claim 5, wherein the feed water preheater comprises exactly two heat exchangers which are in each case connected thermally to a steam line which can transmit heat at a different temperature level.