Numerical model of the steam pipeline with thermal insulation

Karol Kaczmarski

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Numerical model of the steam pipeline with thermal insulation

机译：隔热保温蒸汽管道的数值模型

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Purpose- The purpose of this paper is to develop a numerical model of a steam pipeline connecting a boiler with a turbine, with an insulated outer surface. The temperature distribution inside the pipeline wall was compared when was perfectly insulated and when used real insulation on the outside surface. Design/methodology/approach - The transient temperature, pressure and velocity of steam in the pipeline were determined using a proposed numerical model with distributed parameters. To calculate the transient temperature of the steam and pipeline wall the finite volume method was used. The energy conservation equations were written for all control area around all the nodes. The heat balance equations are a system of first-order ordinary differential equations with respect to time. The Runge- Kutta method of the fourth order was used to solve the system of ordinary differential equations of the first-order. Findings The temperature distribution in the pipeline wall and the temperature distribution in wall insulation were presented. Also, the temperature of the steam and pipeline wall as a function of insulation thickness was calculated. Based on the results obtained by the proposed numerical model, thermal stresses at the inner and outer surface of the component were determined. To assess the accuracy of the proposed model, the results were compared to the analytical solution for the steady state. Originality/value - The paper presents the results obtained from calculations using a numerical model of the steam pipeline with the actual insulation on the outer surface.

机译：目的 - 本文的目的是开发一个与涡轮机连接锅炉的蒸汽管道的数值模型，其中绝缘外表面。当在外表面上使用的真正绝缘时，将管道壁内的温度分布进行比较。设计/方法/方法 - 使用具有分布参数的提出的数值模型确定管道中蒸汽的瞬态温度，压力和速度。为了计算蒸汽和管道壁的瞬态温度，使用有限体积法。为所有节点周围的所有控制区域编写节能方程。热平衡方程是相对于时间的一阶常微分方程系统。第四顺序的速率-Kutta方法用于解决一阶的普通微分方程系统。提出了管道壁中的温度分布和壁绝缘中的温度分布。而且，计算了作为绝缘厚度函数的蒸汽和管道壁的温度。基于通过所提出的数值模型获得的结果，确定组分内表面和外表面的热应力。为了评估所提出的模型的准确性，将结果与用于稳态的分析解决方案进行比较。原创/值 - 本文介绍了使用蒸汽管道的数值模型获得的结果，外表面上的实际绝缘。

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来源
《International journal of numerical methods for heat & fluid flow》 |2020年第5期|2237-2253|共17页
作者
Karol Kaczmarski;
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作者单位

Department of Energy Cracow University of Technology Cracow Poland;

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原文格式 PDF
正文语种 eng
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关键词
Numerical model; Pipeline heating; Real insulation; Thermal stresses; Transient temperature;

机译：数值模型;管道加热;真正的绝缘;热应力;瞬态温度;

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2. Analysis of thermal energy storage optimization of thermal insulation material and thermal insulation structure of steam pipe-line [J] . Wang Yipu, Tu Zhengtao, Yuan Linyang Thermal science . 2020,第5aPartaB期

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3. Numerical Simulation of the Thermal State of a Flooded Pipeline Taking into Account Unsteadiness of the Process of Heat Insulation Saturation with Moisture [J] . G. V. Kuznetsov, V. Yu. Polovnikov Thermal engineering . 2008,第5期

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8. Numerical Methods for Thermally Expandable Two-Phase Flow - Computational Techniques for Steam Generator Modeling [R] . Hall, C. A., Porsching, T. A., Dougall, R. S. 1980

机译：热膨胀两相流数值计算方法 - 蒸汽发生器建模计算技术

Numerical model of the steam pipeline with thermal insulation

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