Process for recovering energy from liquefied gases
First Claim
1. In a process for recovering the energy from a liquefied gas by evaporation in heat exchange with a closed cycle medium which is simultaneously cooled, said cycle medium being thereafter compressed, heated by indirect heat exchange, subjected to engine expansion and recovered in a cyclical manner,the cycle being operated so that the cycle medium remains in the gaseous phase through the entire cycle,wherein the improvement comprises further heating resultant vaporized liquefied gas in indirect heat exchange with said cycle medium after said cycle medium has been engine expanded but before being cooled, and thereafter engine expanding the resultant further heated vaporized liquid.
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Abstract
In a process for recovering the energy from a liquefied gas by evaporation in heat exchange with a cycle medium which is simultaneously cooled, said cycle medium being thereafter compressed, heated, subjected to engine expansion and recovered in a cyclical manner, wherein the improvement comprises operating the cycle so that the cycle medium remains in the gaseous phase throughout the entire cycle.
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Citations
9 Claims
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1. In a process for recovering the energy from a liquefied gas by evaporation in heat exchange with a closed cycle medium which is simultaneously cooled, said cycle medium being thereafter compressed, heated by indirect heat exchange, subjected to engine expansion and recovered in a cyclical manner,
the cycle being operated so that the cycle medium remains in the gaseous phase through the entire cycle, wherein the improvement comprises further heating resultant vaporized liquefied gas in indirect heat exchange with said cycle medium after said cycle medium has been engine expanded but before being cooled, and thereafter engine expanding the resultant further heated vaporized liquid.
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8. Apparatus for evaporating and further heating liquefied gas comprising:
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A. main heat exchanger for the evaporation of liquefied gas, said main heat exchanger having a first flow cross section for evaporating liquefied gas and a second flow cross section for a gaseous medium; B. gas compressor for compressing said gaseous medium, arranged downstream of said second flow cross section of said main heat exchanger; C. recuperator for recovering heat of compression of said gaseous medium, arranged downstream of said gas compressor, said recuperator having a first flow cross section for receiving hot gas from said compressor and a second flow cross section for heating said gaseous medium to be sent to said main heat exchanger; D. heater means for heating said gas medium leaving said first flow cross section of said recuperator, said heater means being indirect heat exchange means heated by external heat; E. expansion turbine for expanding heated gaseous medium and arranged downstream of said heater means; F. supplemental heat exchanger for further heating evaporated liquefied gas, said supplemental heat exchanger including a first flow cross section for evaporated liquefied gas and a second flow cross section for cooling resultant expanded gaseous medium, said second flow cross section arranged downstream of said expansion turbine and upstream of said recuperator; and
conduit means for effecting communication between components A, B, C, D, E, F as a closed cycle between A and F for the liquefied gas. - View Dependent Claims (9)
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Specification