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收稿日期:
2023-11-15
修回日期:
2024-03-12
出版日期:
2024-03-13
通讯作者:
杨明磊,钱锋
作者简介:
赵光耀(1993—),男,博士研究生,1029149158@qq.com
基金资助:
Guangyao ZHAO(), Minglei YANG(), Feng QIAN()
Received:
2023-11-15
Revised:
2024-03-12
Online:
2024-03-13
Contact:
Minglei YANG, Feng QIAN
摘要:
在随机重构法的采样过程中,每一个结构特征需要的采样数量是不相等且变化的。为了将拉丁超立方采样用于降低随机重构模型的方差,基于随机重构法采样过程的特征和拉丁超立方采样的原理,提出了适用于随机重构法的新型拉丁超立方采样方法,探究了在多种分子数量设定情况下应用该方法对随机重构模型的方差和精度的影响。结果表明,应用该方法能够显著降低随机重构模型的方差,提高模型的精度,在分子数量为1000-50000范围内,新模型的标准差相较传统模型降低了71.36%-74.53%,目标函数值降低了1.69%-13.82%。综合模型精度和模拟过程的运算开销,选择4000-6000作为新模型最优的分子数量设定。
中图分类号:
赵光耀, 杨明磊, 钱锋. 基于降方差采样策略的随机重构法[J]. 化工学报, DOI: 10.11949/0438-1157.20231182.
Guangyao ZHAO, Minglei YANG, Feng QIAN. Variance reduction sampling strategy-based stochastic reconstruction method[J]. CIESC Journal, DOI: 10.11949/0438-1157.20231182.
性质 | 实验值 | 性质 | 实验值 | 性质 | 实验值 |
---|---|---|---|---|---|
密度/g·cm-3 | 0.9127 | 硫元素组成/wppm of S | 模拟蒸馏/K | ||
碳元素/wt% | 85.68 | 四氢苯并噻吩 | 566 | 初馏点 | 482 |
氢元素/wt% | 12.38 | 苯并噻吩 | 7681 | 5% | 605 |
硫元素/wt% | 2.24 | 四氢二苯并噻吩 | 853 | 10% | 637 |
氮元素/wppm | 456 | 二苯并噻吩 | 7141 | 20% | 670 |
氢碳比/mol·mol-1 | 1.72 | 四氢苯并萘噻吩 | 1269 | 30% | 693 |
SARA组成/wt% | 苯并萘噻吩 | 3393 | 40% | 710 | |
饱和烃 | 64.2 | 二苯并萘噻吩 | 1507 | 50% | 725 |
芳烃 | 35.8 | 13C核磁/wt% | 60% | 739 | |
同系物组成/wt% | 脂肪烃 CH3 | 14.5 | 70% | 753 | |
烷烃 | 22.1 | 脂肪烃 CH2 | 52.5 | 80% | 768 |
环烷烃 | 42.0 | 脂肪烃 CH | 16.2 | 90% | 785 |
单环芳烃 | 6.1 | 芳烃 CH | 9.7 | 95% | 797 |
双环芳烃 | 12.5 | 芳烃取代位 C | 6.3 | 终馏点 | 827 |
三环芳烃 | 10.4 | 芳烃桥位 C | 0.8 | ||
四环芳烃 | 6.2 | ||||
五环芳烃 | 0.7 |
表1 蜡油样本的宏观性质
Table 1 Properties of VGO sample
性质 | 实验值 | 性质 | 实验值 | 性质 | 实验值 |
---|---|---|---|---|---|
密度/g·cm-3 | 0.9127 | 硫元素组成/wppm of S | 模拟蒸馏/K | ||
碳元素/wt% | 85.68 | 四氢苯并噻吩 | 566 | 初馏点 | 482 |
氢元素/wt% | 12.38 | 苯并噻吩 | 7681 | 5% | 605 |
硫元素/wt% | 2.24 | 四氢二苯并噻吩 | 853 | 10% | 637 |
氮元素/wppm | 456 | 二苯并噻吩 | 7141 | 20% | 670 |
氢碳比/mol·mol-1 | 1.72 | 四氢苯并萘噻吩 | 1269 | 30% | 693 |
SARA组成/wt% | 苯并萘噻吩 | 3393 | 40% | 710 | |
饱和烃 | 64.2 | 二苯并萘噻吩 | 1507 | 50% | 725 |
芳烃 | 35.8 | 13C核磁/wt% | 60% | 739 | |
同系物组成/wt% | 脂肪烃 CH3 | 14.5 | 70% | 753 | |
烷烃 | 22.1 | 脂肪烃 CH2 | 52.5 | 80% | 768 |
环烷烃 | 42.0 | 脂肪烃 CH | 16.2 | 90% | 785 |
单环芳烃 | 6.1 | 芳烃 CH | 9.7 | 95% | 797 |
双环芳烃 | 12.5 | 芳烃取代位 C | 6.3 | 终馏点 | 827 |
三环芳烃 | 10.4 | 芳烃桥位 C | 0.8 | ||
四环芳烃 | 6.2 | ||||
五环芳烃 | 0.7 |
序数 | 结构特征 | 缩写 | 分布类型 | 数值范围 | 参数 | 采样数量 |
---|---|---|---|---|---|---|
1 | 分子类型 | SA1 | 直方图分布 | 1,2或3 | x1, x2 | n1 |
2 | 链烷烃上是否存在侧链 | SA2 | 直方图分布 | 0或1 | x3 | n2 |
3 | 链烷烃上侧链的数量 | SA3 | 直方图分布 | 1,2或3 | x4, x5 | n3 |
4 | 链烷烃的长度 | SA4 | 伽马分布 | 10-40 | x6, x7 | n4 |
5 | 脂肪环数量 | SA5 | 伽马分布 | 1-6 | x8, x9 | n5 |
6 | 苯环数量 | SA6 | 伽马分布 | 1-5 | x10, x11 | n6 |
7 | 芳烃中脂肪环数量 | SA7 | 直方图分布 | 0,1或2 | x12, x13 | n7 |
8 | 噻吩环数量 | SA8 | 直方图分布 | 0或1 | x14 | n8 |
9 | 吡咯环数量 | SA9 | 直方图分布 | 0或1 | x15 | n9 |
10 | 吡啶环数量 | SA10 | 直方图分布 | 0或1 | x16 | n10 |
11 | 环状结构上侧链的数量 | SA11 | 直方图分布 | 1,2,3或4 | x17, x18, x19 | n11 |
12 | 环状结构上侧链的长度 | SA12 | 伽马分布 | 1-29 | x20, x21 | n12 |
表2 设定的结构特征
Table 2 Structural attributes
序数 | 结构特征 | 缩写 | 分布类型 | 数值范围 | 参数 | 采样数量 |
---|---|---|---|---|---|---|
1 | 分子类型 | SA1 | 直方图分布 | 1,2或3 | x1, x2 | n1 |
2 | 链烷烃上是否存在侧链 | SA2 | 直方图分布 | 0或1 | x3 | n2 |
3 | 链烷烃上侧链的数量 | SA3 | 直方图分布 | 1,2或3 | x4, x5 | n3 |
4 | 链烷烃的长度 | SA4 | 伽马分布 | 10-40 | x6, x7 | n4 |
5 | 脂肪环数量 | SA5 | 伽马分布 | 1-6 | x8, x9 | n5 |
6 | 苯环数量 | SA6 | 伽马分布 | 1-5 | x10, x11 | n6 |
7 | 芳烃中脂肪环数量 | SA7 | 直方图分布 | 0,1或2 | x12, x13 | n7 |
8 | 噻吩环数量 | SA8 | 直方图分布 | 0或1 | x14 | n8 |
9 | 吡咯环数量 | SA9 | 直方图分布 | 0或1 | x15 | n9 |
10 | 吡啶环数量 | SA10 | 直方图分布 | 0或1 | x16 | n10 |
11 | 环状结构上侧链的数量 | SA11 | 直方图分布 | 1,2,3或4 | x17, x18, x19 | n11 |
12 | 环状结构上侧链的长度 | SA12 | 伽马分布 | 1-29 | x20, x21 | n12 |
参数 | 下限 | 上限 | 递增约束 | 参数 | 下限 | 上限 | 参数 | 下限 | 上限 |
---|---|---|---|---|---|---|---|---|---|
x1, x2 | 0 | 1 | x1< x2 | x6 | 1 | 20 | x7 | 9 | 41 |
x4, x5 | 0 | 1 | x4< x5 | x8 | 0 | 20 | x9 | 0 | 7 |
x12, x13 | 0 | 1 | x12< x13 | x10 | 0 | 20 | x11 | 0 | 6 |
x17, x18, x19 | 0 | 1 | x17< x18< x19 | x20 | 1 | 20 | x21 | 0 | 30 |
x3, x14, x15, x16 | 0 | 1 |
表3 模型参数的边界和直方图分布中参数的约束
Table 3 Boundaries for parameters and constraints for parameters in histogram distributions
参数 | 下限 | 上限 | 递增约束 | 参数 | 下限 | 上限 | 参数 | 下限 | 上限 |
---|---|---|---|---|---|---|---|---|---|
x1, x2 | 0 | 1 | x1< x2 | x6 | 1 | 20 | x7 | 9 | 41 |
x4, x5 | 0 | 1 | x4< x5 | x8 | 0 | 20 | x9 | 0 | 7 |
x12, x13 | 0 | 1 | x12< x13 | x10 | 0 | 20 | x11 | 0 | 6 |
x17, x18, x19 | 0 | 1 | x17< x18< x19 | x20 | 1 | 20 | x21 | 0 | 30 |
x3, x14, x15, x16 | 0 | 1 |
分子序数 | SA1 | SA2 | SA3 | SA4 |
---|---|---|---|---|
1 | s1,1 | - | - | - |
2 | s2,1 | s1,2 | s1,3 | s1,4 |
3 | s3,1 | s2,2 | - | s2,4 |
4 | s4,1 | - | - | - |
5 | s5,1 | s3,2 | s2,3 | s3,4 |
6 | s6,1 | s4,2 | - | s4,4 |
︙ | ︙ | ︙ | ︙ | ︙ |
k2 | sk2,1 | ︙ | sn3,3 | ︙ |
︙ | ︙ | ︙ | - | ︙ |
k1 | sk1,1 | sn2,1 | - | sn4,4 |
︙ | ︙ | - | - | - |
n | sn1,1 | - | - | - |
表4 链烷烃分子中结构特征值的匹配过程
Table 4 Alignment of structural attribute values in paraffins
分子序数 | SA1 | SA2 | SA3 | SA4 |
---|---|---|---|---|
1 | s1,1 | - | - | - |
2 | s2,1 | s1,2 | s1,3 | s1,4 |
3 | s3,1 | s2,2 | - | s2,4 |
4 | s4,1 | - | - | - |
5 | s5,1 | s3,2 | s2,3 | s3,4 |
6 | s6,1 | s4,2 | - | s4,4 |
︙ | ︙ | ︙ | ︙ | ︙ |
k2 | sk2,1 | ︙ | sn3,3 | ︙ |
︙ | ︙ | ︙ | - | ︙ |
k1 | sk1,1 | sn2,1 | - | sn4,4 |
︙ | ︙ | - | - | - |
n | sn1,1 | - | - | - |
工况 | 分子数量 | 工况 | 分子数量 | 工况 | 分子数量 |
---|---|---|---|---|---|
1 | 1000 | 6 | 6000 | 11 | 20000 |
2 | 2000 | 7 | 7000 | 12 | 30000 |
3 | 3000 | 8 | 8000 | 13 | 40000 |
4 | 4000 | 9 | 9000 | 14 | 50000 |
5 | 5000 | 10 | 10000 |
表5 在不同工况中采用的分子数量
Table 5 Number of molecules in different cases
工况 | 分子数量 | 工况 | 分子数量 | 工况 | 分子数量 |
---|---|---|---|---|---|
1 | 1000 | 6 | 6000 | 11 | 20000 |
2 | 2000 | 7 | 7000 | 12 | 30000 |
3 | 3000 | 8 | 8000 | 13 | 40000 |
4 | 4000 | 9 | 9000 | 14 | 50000 |
5 | 5000 | 10 | 10000 |
性质 | 实验值 | Chen | 传统模型 | 本模型 |
---|---|---|---|---|
密度/g·cm-3 | 0.9127 | 0.9170 | 0.9269 | 0.9292 |
碳元素/wt% | 85.68 | 85.40 | 85.54 | 85.51 |
氢元素/wt% | 12.38 | 12.30 | 12.30 | 12.18 |
硫元素/wt% | 2.24 | 2.24 | 2.12 | 2.26 |
氮元素/wppm | 456 | 608 | 458 | 448 |
氢碳比/mol·mol-1 | 1.72 | 1.72 | 1.72 | 1.71 |
SARA组成/wt% | ||||
饱和烃 | 64.2 | 64.1 | 63.19 | 63.8 |
芳烃 | 35.8 | 35.9 | 36.41 | 36.2 |
同系物组成/wt% | ||||
烷烃 | 22.1 | 21.3 | 23.2 | 21.9 |
环烷烃 | 42.0 | 42.8 | 39.9 | 41.9 |
单环芳烃 | 6.1 | 6.2 | 6.2 | 5.4 |
双环芳烃 | 12.5 | 13.2 | 11.5 | 11.9 |
三环芳烃 | 10.4 | 9.8 | 10.2 | 10.3 |
四环芳烃 | 6.2 | 5.0 | 5.9 | 5.7 |
五环芳烃 | 0.7 | 1.8 | 3.0 | 3.0 |
硫元素组成/wppm of S | ||||
四氢苯并噻吩 | 566 | 577 | 555 | 491 |
苯并噻吩 | 7681 | 7772 | 8194 | 8469 |
四氢二苯并噻吩 | 853 | 904 | 853 | 981 |
二苯并噻吩 | 7141 | 7061 | 5916 | 6628 |
四氢苯并萘噻吩 | 1269 | 1126 | 845 | 1023 |
苯并萘噻吩 | 3393 | 3391 | 3300 | 3478 |
二苯并萘噻吩 | 1507 | 1592 | 1538 | 1514 |
13C核磁/wt% | ||||
脂肪烃 CH3 | 14.5 | 13.0 | 14.6 | 14.2 |
脂肪烃 CH2 | 52.5 | 54.3 | 56.0 | 55.9 |
脂肪烃 CH | 16.2 | 15.9 | 15.7 | 16.0 |
芳烃 CH | 9.7 | 8.0 | 5.4 | 5.2 |
芳烃取代位 C | 6.3 | 4.3 | 4.0 | 4.3 |
芳烃桥位 C | 0.8 | 4.4 | 4.3 | 4.4 |
表6 宏观性质计算值和实验值的对比
Table 6 Comparison of bulk properties between experiment and estimation
性质 | 实验值 | Chen | 传统模型 | 本模型 |
---|---|---|---|---|
密度/g·cm-3 | 0.9127 | 0.9170 | 0.9269 | 0.9292 |
碳元素/wt% | 85.68 | 85.40 | 85.54 | 85.51 |
氢元素/wt% | 12.38 | 12.30 | 12.30 | 12.18 |
硫元素/wt% | 2.24 | 2.24 | 2.12 | 2.26 |
氮元素/wppm | 456 | 608 | 458 | 448 |
氢碳比/mol·mol-1 | 1.72 | 1.72 | 1.72 | 1.71 |
SARA组成/wt% | ||||
饱和烃 | 64.2 | 64.1 | 63.19 | 63.8 |
芳烃 | 35.8 | 35.9 | 36.41 | 36.2 |
同系物组成/wt% | ||||
烷烃 | 22.1 | 21.3 | 23.2 | 21.9 |
环烷烃 | 42.0 | 42.8 | 39.9 | 41.9 |
单环芳烃 | 6.1 | 6.2 | 6.2 | 5.4 |
双环芳烃 | 12.5 | 13.2 | 11.5 | 11.9 |
三环芳烃 | 10.4 | 9.8 | 10.2 | 10.3 |
四环芳烃 | 6.2 | 5.0 | 5.9 | 5.7 |
五环芳烃 | 0.7 | 1.8 | 3.0 | 3.0 |
硫元素组成/wppm of S | ||||
四氢苯并噻吩 | 566 | 577 | 555 | 491 |
苯并噻吩 | 7681 | 7772 | 8194 | 8469 |
四氢二苯并噻吩 | 853 | 904 | 853 | 981 |
二苯并噻吩 | 7141 | 7061 | 5916 | 6628 |
四氢苯并萘噻吩 | 1269 | 1126 | 845 | 1023 |
苯并萘噻吩 | 3393 | 3391 | 3300 | 3478 |
二苯并萘噻吩 | 1507 | 1592 | 1538 | 1514 |
13C核磁/wt% | ||||
脂肪烃 CH3 | 14.5 | 13.0 | 14.6 | 14.2 |
脂肪烃 CH2 | 52.5 | 54.3 | 56.0 | 55.9 |
脂肪烃 CH | 16.2 | 15.9 | 15.7 | 16.0 |
芳烃 CH | 9.7 | 8.0 | 5.4 | 5.2 |
芳烃取代位 C | 6.3 | 4.3 | 4.0 | 4.3 |
芳烃桥位 C | 0.8 | 4.4 | 4.3 | 4.4 |
图 7 蒸馏数据计算值和实验值的对比:(a) 传统模型 (b) 本模型
Fig.7 Comparison of distillation curve data between estimation and experiment: (a) the traditional model (b) the new model
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