Forming liquid sprays in compressed-gas energy storage systems for effective heat exchange
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01K-021/04
F15B-021/04
출원번호
US-0105988
(2011-05-12)
등록번호
US-8234863
(2012-08-07)
발명자
/ 주소
McBride, Troy O.
Bell, Alexander
Bollinger, Benjamin R.
출원인 / 주소
SustainX, Inc.
대리인 / 주소
Bingham McCutchen LLP
인용정보
피인용 횟수 :
17인용 특허 :
426
초록
In various embodiments, efficiency of energy storage and recovery systems compressing and expanding gas is improved via heat exchange between the gas and a heat-transfer fluid.
대표청구항▼
1. A compressed-gas energy storage and recovery system comprising: a cylinder assembly for at least one of compressing gas to store energy or expanding gas to recover energy;a movable boundary mechanism separating the cylinder assembly into two chambers;a crankshaft, mechanically coupled to the boun
1. A compressed-gas energy storage and recovery system comprising: a cylinder assembly for at least one of compressing gas to store energy or expanding gas to recover energy;a movable boundary mechanism separating the cylinder assembly into two chambers;a crankshaft, mechanically coupled to the boundary mechanism, for converting reciprocal motion of the boundary mechanism into rotary motion;a heat-transfer mechanism, comprising a plurality of nozzles, for introducing heat-transfer fluid within a chamber of the cylinder assembly to exchange heat with gas therein, thereby increasing efficiency of the energy storage and recovery;an actuating mechanism for controlling a number of active nozzles introducing heat-transfer fluid within the chamber during a single cycle of compression or expansion of gas, the actuating mechanism comprising a plurality of valves and a control system for controlling the valves based at least on a pressure within the cylinder assembly; anda sensor for measuring the pressure within the cylinder assembly, the control system being responsive to the sensor,wherein the plurality of nozzles is organized into at least two nozzle groups, at least one nozzle group not being active during a portion of the single cycle of compression or expansion. 2. The system of claim 1, wherein at least one valve is a cracking-pressure valve. 3. The system of claim 1, wherein the control system controls at least one of the cylinder assembly or the heat-transfer mechanism to render the at least one of compression or expansion substantially isothermal. 4. The system of claim 1, wherein the plurality of nozzles are substantially identical to each other. 5. The system of claim 1, wherein at least two of the nozzles differ in at least one characteristic selected from the group consisting of type, size, and throughput. 6. The system of claim 1, wherein the heat-transfer mechanism comprises at least one of a spray head or a spray rod. 7. The system of claim 1, further comprising a heat exchanger and a circulation apparatus for circulating heat-transfer fluid between the heat exchanger and the cylinder assembly. 8. The system of claim 1, further comprising, selectively fluidly connected to the cylinder assembly, (i) a compressed-gas reservoir for storage of gas after compression and supply of compressed gas for expansion thereof, and (ii) a vent for exhausting expanded gas to atmosphere and supply of gas for compression thereof. 9. The system of claim 1, further comprising, connected to the cylinder assembly, an intermittent renewable energy source of wind or solar energy, wherein (i) energy stored during compression of gas originates from the intermittent renewable energy source, and (ii) energy is recovered via expansion of gas when the intermittent renewable energy source is nonfunctional. 10. The system of claim 1, wherein the two separated chambers are pneumatic chambers. 11. The system of claim 1, further comprising a motor/generator coupled to the crankshaft. 12. The system of claim 1, wherein the heat-transfer fluid is introduced within the chamber in the form of an atomized spray filling substantially an entire volume of the chamber. 13. The system of claim 7, wherein the movable boundary mechanism defines a fluid passageway that is selectively fluidly connected to the circulation apparatus. 14. The system of claim 8, wherein the cylinder assembly comprises a high-pressure cylinder selectively fluidly connected to the compressed-gas reservoir and a low-pressure cylinder, different from the high-pressure cylinder, selectively fluidly connected to the vent. 15. The system of claim 1, wherein, during a second portion of the single cycle of expansion or compression, each of the nozzles is active. 16. The system of claim 1, wherein the control system controls the valves such that a flow rate of heat-transfer fluid through each active nozzle is substantially constant and independent of the number of active nozzles. 17. The system of claim 1, wherein the control system controls the pressure of heat-transfer fluid supplied to each active nozzle such that a spray pressure from each active nozzle is approximately equal to a spray pressure required to generate an atomized spray from the active nozzle. 18. The system of claim 1, further comprising, for each nozzle group, a separate pipe and a separate manifold for supply of heat-transfer fluid to the nozzle group. 19. The system of claim 1, wherein the heat-transfer mechanism comprises a plurality of nozzles disposed in a second chamber of the cylinder assembly. 20. The system of claim 1, wherein the nozzles of at least two of the nozzle groups differ in at least one characteristic selected from the group consisting of type, size, and throughput, the nozzles within each of the at least two nozzle groups being substantially identical to each other.
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