IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0836293
(1977-09-26)
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발명자
/ 주소 |
- Woinsky Samuel G. (Irvine CA)
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출원인 / 주소 |
- Occidental Petroleum Corporation (Los Angeles CA 02)
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인용정보 |
피인용 횟수 :
4 인용 특허 :
1 |
초록
▼
Process and system for recovery of energy from geothermal brines and other water containing or hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a working fluid, e.g. n-butane, in a heat transfer column, the heat transfer column being operated in the
Process and system for recovery of energy from geothermal brines and other water containing or hot water sources, which comprises direct contact heat exchange between the brine or hot water, and a working fluid, e.g. n-butane, in a heat transfer column, the heat transfer column being operated in the subcritical pressure region of the working fluid, preferably close to or approaching the apex of the saturated vapor curve for such working fluid on the Mollier enthalpy-entropy diagram for such fluid. The heated working fluid exiting the top of the heat transfer column is expanded through an expander to produce work. The discharge from the expander is cooled to condense working fluid which is separated in an accumulator, from condensed water vapor present in the working fluid, and the condensed working fluid is pressurized and fed back to the heat transfer column. Water from the accumulator can be fed to an H2S removal system where good quality water can be recovered. Cooled brine or water from the bottom of the heat transfer column and water from the accumulator are fed to a flashing device such as a flash drum, and the working fluid flashed off is compressed and returned to the cooler at the expander discharge, for condensation and recovery. Also, entrained liquid phase working fluid can be separated from the cooled brine or water prior to flashing, and returned to the system. Uncondensible gases plus some working fluid losses are vented from the accumulator, and preferably the system can be operated under conditions to vent a minimum of uncondensible gases from the accumulator, and thereby reduce working fluid losses, Any accumulator vent gas can be fed to the H2S removal system.
대표청구항
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Process for recovery of energy from elevated temperature or hot water-containing fluids which contain uncondensible gas, including geothermal brines and other elevated temperature water sources, which comprises (a) contacting said water-containing fluid which contains uncondensible gas in heat excha
Process for recovery of energy from elevated temperature or hot water-containing fluids which contain uncondensible gas, including geothermal brines and other elevated temperature water sources, which comprises (a) contacting said water-containing fluid which contains uncondensible gas in heat exchange relation with a working fluid in liquid form in a heat transfer zone, to produce a cooled water-containing fluid, (b) heating said working fluid by such contact at a temperature to produce boiling thereof in the upper portion of said heat transfer zone, said heat transfer zone being maintained at a pressure below the critical pressure of said working fluid, to produce resulting vapors of working fluid and water together with uncondensible gas, (c) expanding the resulting vapors and gas in an expander to produce work, and discharging the expanded vapors and gas from said expander, (d) withdrawing cooled water-containing fluid from said heat transfer zone of step (a) containing working fluid, (e) flashing said cooled water-containing fluid of step (d) in a flash zone to flash off the working fluid therein including uncondensible gas, and leave cooled liquid, and discharging said cooled liquid, (f) compressing the flashed-off working fluid and said gas, (g) mixing said compressed working fluid and said gas from step (f) with the expanded vapors and gas discharged from said expander of step (c) to form a mixture, (h) cooling said mixture and condensing the expanded working fluid vapor and water vapor therein, to form condensed working fluid and condensed water vapor, (i) separating, in an accumulator zone, condensed working fluid from condensed water vapor and recycled uncondensible gas from step (h), (j) returning said condensed working fluid to said heat transfer zone for reheating therein, and (k) carrying out said flashing in step (e) of said cooled water-containing fluid at a pressure sufficiently high in relation to the pressure in said accumulator zone so that the recycle of flashed-off uncondensible gas from said flash zone to said accumulator zone is reduced to a level such that there is essentially little or no vent gas discharged from said accumulator zone.
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