Prediction of thermodynamic properties of hydrocarbon working fluids by graph neural network models

doi:10.11949/0438-1157.20230942

Abstract

Abstract:

Organic Rankine cycle (ORC) has attracted much attention due to its ability to convert low-grade heat to electricity. One of the important tasks to promote the application of ORC is to find efficient and environmentally friendly working fluids to replace high-GWP (global warming potential) hydrochlorofluorocarbon (HCFC) and hydrofluorocarbon (HFC). In this article, a prediction model for the thermodynamic properties of ORC hydrocarbon working fluids based on graph neural networks (GNN) is constructed. GNN is used to learn the characteristics of molecular structure, and the combination of molecular structure characteristics and temperature is used to build a prediction model of molecular structure and properties using multilayer perceptron (MLP). The model is based on a training set of 2508 linear, cyclic, and aromatic hydrocarbons with carbon chain lengths ranging from 2 to 10. The obtained model achieves better prediction results than previous literature on predicting critical temperature, evaporation enthalpy and gas-phase and liquid-phase molar heat capacity. In addition, the resulting model was applied to predict the thermodynamic properties of over 430000 hydrofluoroolefins.

Key words: thermodynamic properties, prediction, neural network, ORC working fluids, hydrofluoroolefin

摘要：

有机朗肯循环(ORC)因其低温热电转换的能力而备受关注，寻找高效环保工质，以代替具有较高全球变暖潜能值(GWP)的氢氯氟烃(HCFC)和氢氟烃(HFC)，是推动ORC应用的重要任务之一。构建一个基于图神经网络(GNN)的ORC烃类工质热力学性质预测模型，通过图神经网络学习分子结构的特征，并将分子结构信息与温度结合，利用多层感知机(MLP)构建热力学性质预测模型。模型基于2508种C₂~C₁₀的链状烃、环烃和芳香烃分子构建训练集，所得模型在预测临界温度、蒸发焓、气相摩尔热容和液相摩尔热容上均取得良好效果，优于文献的预测效果。此外，应用所得模型预测了超43万个氢氟烯烃(HFO)的热力学性质。

关键词: 热力学性质, 预测, 神经网络, ORC工质, 氢氟烯烃

CLC Number:

TQ 021.8

Xiaodong HONG, Xuan DONG, Meijin LIN, Zuwei LIAO, Congjing REN, Yao YANG, Binbo JIANG, Jingdai WANG, Yongrong YANG. Prediction of thermodynamic properties of hydrocarbon working fluids by graph neural network models[J]. CIESC Journal, 2023, 74(11): 4466-4474.

洪小东, 董轩, 林美金, 廖祖维, 任聪静, 杨遥, 蒋斌波, 王靖岱, 阳永荣. 图神经网络预测烃类工质的热力学性质[J]. 化工学报, 2023, 74(11): 4466-4474.

Figures/Tables 10

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数据集	模型输入：模型输出	数量
#1	SMILES：T_c (℃)	2508
#2	SMILES + T：H_eva (J/mol)	44717
#3	SMILES + T：C_p_g (J/(mol·℃))	44717
#4	SMILES + T：C_pl (J/(mol·℃))	44717

数据集	模型输入：模型输出	数量
#1	SMILES：T_c (℃)	2508
#2	SMILES + T：H_eva (J/mol)	44717
#3	SMILES + T：C_p_g (J/(mol·℃))	44717
#4	SMILES + T：C_pl (J/(mol·℃))	44717

特征	描述	维度
原子类型	原子类型（C, Cl, F, O）	4
是否成环	原子是否在成环体系中	1
是否芳香性	原子是否是芳香体系的一部分	1
杂化	sp, sp², sp³, sp³d, sp³d²	5
键数目	原子相连的键数目（0~6）	7
氢原子数目	原子相连的氢原子数目（0~3）	4

特征	描述	维度
原子类型	原子类型（C, Cl, F, O）	4
是否成环	原子是否在成环体系中	1
是否芳香性	原子是否是芳香体系的一部分	1
杂化	sp, sp², sp³, sp³d, sp³d²	5
键数目	原子相连的键数目（0~6）	7
氢原子数目	原子相连的氢原子数目（0~3）	4

特征	描述	维度
键类别	单键、双键、叁键或芳香键	4
共轭	键是否共轭	1
成环	键是否属于环结构	1
立体	无、任意、E、Z、顺式、反式	6