A Targeting Methodology for Multistage Gas-Phase Auto Refrigeration Processes
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- 作者：Nipen M. Shah ; Andrew F. A. Hoadley
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2007
- 出版时间：June 20, 2007
- 年：2007
- 卷：46
- 期：13
- 页码：4497 - 4505
- 全文大小：207K
- 年卷期：v.46,no.13(June 20, 2007)
- ISSN：1520-5045
文摘
Many chemical processes require refrigeration over a broad range of low temperatures. Gas-phase refrigerationsystems can provide cooling down to cryogenic temperatures, using auto refrigeration to cool the refrigerantbefore it is expanded. The economics of these systems are dominated by the shaftwork supplied to thecompressors and the capital cost of the rotating equipment, both the compressors and the turboexpanders. Ashaftwork targeting method has been developed for gas-phase refrigeration systems that require a continuouscooling load from ambient to some minimum temperature. The method involves the use of a number ofgas-phase refrigeration loops which are matched against the grand composite curve. The targeting method isused to demonstrate the relationship between the expansion/compression pressure ratio and the heat-exchangedesign parameter 
fchars/Delta.gif" BORDER=0 >Tmin. The potential for shaftwork recovery from surplus cold streams is also explored.Some interesting insights from the targeting are the relative insensitivity of the pressure ratio and the importanceof the isentropic efficiency especially for energy recovery from cold streams.
fchars/Delta.gif" BORDER=0 >Tmin. The potential for shaftwork recovery from surplus cold streams is also explored.Some interesting insights from the targeting are the relative insensitivity of the pressure ratio and the importanceof the isentropic efficiency especially for energy recovery from cold streams.