Modeling of thermal and hydraulic processes in the main gas pipeline
The relevance of the discussed issue is caused by the necessity to improve the procedures of designing thermohydraulic modes of a pipeline for reducing power requirements on gas transporting and increasing carrying capacity of the main pipeline. The main aim of the study is to analyze the existing d...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2017-11-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya-tpu.ru/archive/article/view/1895 |
| Summary: | The relevance of the discussed issue is caused by the necessity to improve the procedures of designing thermohydraulic modes of a pipeline for reducing power requirements on gas transporting and increasing carrying capacity of the main pipeline. The main aim of the study is to analyze the existing design procedures of thermal and hydraulic processes and to develop the advanced economical alternatives. The paper considers the complex of problems on modelling the hydrodynamic and thermal processes in the system «gas stream - pipe - circumambient». Gas swapping is accompanied by its heating at compression, that is reflected in pressure growth in a pipeline and capacity reduction. To decrease power inputs on gas transporting the authors have considered the complex of modelling problems. The methods. The authors applied the finite element method realized in software package Comsol to calculate thermal and hydraulic processes in the ground and the pipeline. The influence of air temperature seasonal modifications on thermal streams between the pipeline and the ground was analyzed. Taking into account large inertia of heat transfer processes in the ground the authors proposed the consecutive algorithm of solving the problem of modelling heat transfer in the ground and thermos-and fluid dynamics in a pipe with moving gas. The results. The authors developed the numerical model of heat distribution processes in the ground and determined the parameters of the models for stationary modes. On the basis of the thermohydraulic model of a gas stream in a pipe the velocity profile and thickness of a wall layer were determined taking into account heat exchange with environment. This allowed passing to a thermal problem with the moving two-layer medium, equivalent in temperature distribution in the pipeline and magnitude of a thermal stream into environment. Based on the calculations of thermal processes in the ground the authors determined the parameters of the simplified thermohydraulic model for a pipeline that allows gaining the solutions for a great range of environment temperature. |
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| ISSN: | 2500-1019 2413-1830 |