﻿ LNG低温管道预冷工艺数值模拟 Numerical Simulation on the Pre-Cooling Process of the LNG Low-Temperature Pipe

Mechanical Engineering and Technology
Vol.05 No.03(2016), Article ID:18678,6 pages
10.12677/MET.2016.53032

Numerical Simulation on the Pre-Cooling Process of the LNG Low-Temperature Pipe

Hongzhi Zhang1, Xuanyu Sheng2, Jing Huang1, Junman Shu1, Yachen Xu3

1Installation Company of Daqing Oilfield Engineering Construction Co., Ltd., Daqing Heilongjiang

2Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing

3Research Center of Advanced Energy Equipment Technology, Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin

Received: Sep. 8th, 2016; accepted: Sep. 27th, 2016; published: Sep. 30th, 2016

ABSTRACT

LNG low-temperature pipe pre-cooling is difficult point of completion and commissioning of LNG project. Under the flow rate of 0.2 m/s, 0.5 m/s and 1 m/s, FLUENT software is used to conduct simulation of BOG gas pre-cooling technology for Φ630 × 10 mm low-temperature pipe to obtain temperature change regularity of pipe during BOG pre-cooling process and real-time display of temperature of low-temperature pipe during pre-cooling process and to formulate pre-cooling plan of low-temperature pipe.

Keywords:LNG Low-Temperature Pipe, Pre-Cooling, Numerical Simulation

LNG低温管道预冷工艺数值模拟

1大庆油田工程建设有限公司安装公司，黑龙江 大庆

2清华大学核能与新能源技术研究院，北京

3清华大学天津高端装备研究院先进能源装备技术研究所，天津

LNG低温管道预冷是LNG工程投产试运行的难点，采用FLUENT软件对Φ630 × 10 mm低温管道进行BOG气体预冷工艺模拟，在0.2 m/s、0.5 m/s、1 m/s流速下，获得了BOG预冷过程的管道温度变化规律，以及低温管道在预冷过程中的实时温度显示，并制定了低温管道预冷方案。

1. 引言

LNG低温管道施工完成后，应对LNG管道进行预冷工艺。由于LNG是液态天然气，运行温度为−163℃。如果不进行预冷直接投入，不仅会产生收缩变形，而且由于冷却过快使低温管道上下表面温差产生弯曲变形及热应力破坏 [1] 。

2. 低温管道结构

3. 模型建立

Table 1. Physical parameters of the pipe

1) 忽略管壁轴向导热，仅考虑管壁径向导热；

2) 不考虑管道外壁与保冷层之间的接触热阻；

3) 管壁和保冷材料的热容、热导率等物性不随温度变化。

(1)

(2)

(3)

(4)

(5)

(6)

4. 数值模拟计算结果及分析

Figure 1. Temperature cloud chart of the BOG pipe after pre-cooling 10 min

Figure 2. Temperature response of the pipe wall with pre-cooling time under the different flow rates

(a) (b)(c)

Figure 3. Temperature cloud chart of the pipe cross section after pre-cooling 12 h under the different flow rates. (a) velocity of 0.2 m/s, (b) velocity of 0.5 m/s, (c) velocity of 1 m/s

5. 结论

Numerical Simulation on the Pre-Cooling Process of the LNG Low-Temperature Pipe[J]. 机械工程与技术, 2016, 05(03): 272-277. http://dx.doi.org/10.12677/MET.2016.53032

1. 1. 华创, 张帆, 胡洪兵, 高利波, 张杰. LNG储存技术研究现状[J]. 当代化工, 2016(6): 1267-1269.

2. 2. 曹学文, 吉俊毅, 杨文. LNG卸料管道氮气预冷温度分布规律[J]. 油气储运, 2016(3): 492-502.

3. 3. 余红梅, 李兆慈, 编. 水平管道预冷过程研究[J]. 管道技术与设备, 2009(6): 16-21.

4. 4. 严俊伟, 李兆慈, 编. LNG低温管道预冷过程数值模拟[J]. 低温与超导, 2014(9): 10-14.

5. 5. 卢超, 耑锐, 易冲冲, 王文, 吕俊, 王蕾. BOG气体对LNG输送管道预冷的数值模拟[J]. 低温工程, 2012(6): 51-56.

6. 6. 韩力, 刘鑫鹏, 马金晶, 郭开华. 半封闭空间LNG泄漏安全性数值模拟研究[J]. 石油与天然气化工, 2016(3): 97-102.