GPA TP-3-1973 Model for the Precise Calculation of Liquefied Natural Gas Densities《液化天然气密度的精确计算模型》.pdf
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1、GPA TP-3 73 3824677 0030739 578 1812 First Place Tech nical Publication TP-3 A Model for the Precise Calculation of Liquefied Natural Gas Densities Tulsa, Okla. 74103 M. A. Albright Phillips Petroleum Company Bartlesville, Oklahoma June, 1973 Phone: 9181582.5112 GPA TP-3 73 IPI 3824699 OOL0740 2T =
2、I FOREWORD The impending energy shortage has created a need for accurate liquefied natural gas density data. They are particularly nceded by those companies involved in the manufacture and/or transportation of the commodity. A correlation and computer program to calculate accurxe LNG deiisities was
3、recently developed by M. A. Albright, Phillips Petroleum Company. One of the convenient features of this program permits the easy insertion of new and more accurate experimental data as they become available. This program yhould be a bcneficial and worthwhile tool for the LNG industry. The Natural G
4、as Procesiors Association grate- fully acknowledges thi5 substantial contribution of time and effort bs. Mr. Albriglit ;id the release of this material by his company, lliillips Petroleum Com pan y. Bart les v il le, 0 k la homa. The publication of this material i5 part of ;I continuing effort by NG
5、IA to provide, for industry use, the latex experimcntnl dxa rind desigr, tech- nology. Such publicsition docs not constitute an endorseinent of either tlie data or the methods con- tiiiicd lierein; the publication may bc used by anyone desiring to do so, but neither NGPA nor Phillips Peti-olcum C.om
6、pany dl be held responsible or liable in my way for any los or drimagc that may result thcref roni. GPA TP-3 73 W 3824699 OOLO74L 126 A MODEL FOR THE PRECISE CALCULATION OF LIQUEFIED NATURAL GAS DENSITIES i M. A. Albright Phillips Petroleum Company GPA TP-3 73 W 3824b99 O030742 Ob2 . A MODEL FOR THE
7、 PRECISE CALCULATION OF LIQUEFIED NATURAL GAS DENSITIES A model which will reproduce the most accurate densities available for Liquefied Natural Gas mixtures is presented. to give the precision needed for custody transfer accounting. It is intended The model is based upon a cell model developed by E
8、ckert, Renon, and Praucnitz(1) with unsymmetrical binary interactions that are tempera- ture dependent as recommended by Yuan(2). by corresponding states based upon the liquid ethane densities measured by Pai(% The pressure dependence is As presented, the model will give high precision liquid densit
9、ies for pure components and mixtures of nitrogen, methane, ethane, propane, i-butane, n-butane, i-pentane, n-pentane, neopentane, n-hexane, ri-heptane, n-octane, n-nonane, n-decane, carbon dioxide, hydrogen sulfide, and water. The values are accurate up to 60 atm. for pure component reduced tempera-
10、 tures up to 0.99 and for mixtures with reduced temperatures below 0.90. The model, as presented, gives highly precise densities for those components where data are available. needed and will be available as a result of a joint industry-sponsored research project at the National Bureau of Standards
11、Cryogenic Laboratory at Boulder, Colorado, better binary interactions to be evaluated and introduced into this model. However, more binary data are As these data become available, they will allow GPA TP-3 73 3824699 0010743 TT9 Page ii 2 1 A (Continued) Part 2 of this report will deal with the densi
12、ties of Liquefied Petroleum Gas mixtures. near critical or supercritical components such as ethane are a special case as compared with Liquefied Natural Gases. These mixtures which contain large quantities of GPA TP-3 73 E 3824b77 0030744 735 Purpose of the Research The purpose of this research was
13、to develop a liquid density model which would calculate light hydrocarbon liquid densities within the repro- ducibility of the most highly precise experimental values available. Phis model can then be used to calculate densities for the sale or custody transfer of light hydrocarbon mixtures, LPG, an
14、d LNG. For those mixtures, at the temperatures and pressures normally encountered in industry, the assumption of additive volumes is not a valid assumption. higher than the actual mixture volume. the infinite number of possible compositions of the mixtures is impossible, the ability to predict densi
15、ties to high precision is required. The volume estimated by that assumption may be as much as 7% Since measurement of the densities of A point worth noting in sale and custody transfer is that if the densities used are biased for or against the buyer or seller, that bias will not even out but will r
16、emain for the life of the contract. This is in contrast to the long-term averaging of measurements by properly calibrated volumetric flow meters. Characteristics of the Model The model proceeds as follows in its calculations: First, the hypothetical zero pressure liquid density partial volumes are c
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