Experimental study and numerical simulation on coupled heat transfer characteristics of submerged combustion vaporizer

doi:10.11949/j.issn.0438-1157.20160973

Abstract

Abstract:

Submerged combustion vaporizer is indispensable heat exchanger equipment for liquefied natural gas (LNG) receiving terminals, it mainly utilizes water bath system as intermediate media to achieve heat transfer between flue gas and LNG. In this work, an unabridged experimental apparatus is built to study the complex heat transfer characteristics of it. Experimental results reveal some unique fluid dynamic phenomena inside SCV system (local water bath freezes). Meanwhile, the simulated model is established for coupled flow and heat transfer process between two-phase mixture and trans-critical LNG. The influences of inlet LNG pressure, inlet LNG velocity, static water height, flue gas flux on the NG outlet temperature and water bath temperature are analyzed. The outcomes can provide some important guidance to localization design of SCV.

Key words: submerged combustion vaporizer, LNG, experiment, flow, heat transfer, water bath temperature, numerical simulation

摘要：

浸没燃烧式汽化器（SCV）是液化天然气（LNG）接收站中一种必不可少的换热设备，主要通过水浴系统作为中间介质实现烟气与LNG之间的热量传递。搭建一套完整的SCV流动换热实验平台，对其内部复杂的传热特性进行研究。可视化实验结果揭示了汽化器内部一些独特的流体动力学现象（局部水浴结冰等），同时通过建立的气液两相混合物与跨临界LNG耦合传热计算模型得到了换热管束内外局部流体温度和局部传热系数分布曲线，并分析了LNG进口压力、LNG入口速度、初始水位高度以及烟气进气量对NG出口温度和水浴温度的影响规律。研究成果能够为SCV国产化设计提供重要参考。

关键词: 浸没燃烧式汽化器, LNG, 实验, 流动, 传热, 水浴温度, 数值模拟

CLC Number:

TE088

HAN Changliang, REN Jingjie, WANG Yanqing, DONG Wenping, BI Mingshu. Experimental study and numerical simulation on coupled heat transfer characteristics of submerged combustion vaporizer[J]. CIESC Journal, 2017, 68(3): 854-863.

韩昌亮, 任婧杰, 王焱庆, 董文平, 毕明树. SCV耦合传热特性实验研究与数值模拟[J]. 化工学报, 2017, 68(3): 854-863.

References 20

[1]	梅鹏程, 邓春锋, 邓欣. LNG气化器的分类及选型设计[J]. 化学工程与装备, 2016, (5):65-70. MEI P C, DENG C F, DENG X. Classification and selection design of LNG vaporizer[J]. Chemical Engineering & Equipment, 2016, (5):65-70.
[2]	康风立, 孙海峰, 熊亚选, 等. 浸没燃烧式LNG气化器水浴气化传热计算[J]. 油气储运, 2016, 35(4):406-411. KANG F L, SUN H F, XIONG Y X, et al. Computation of heat transfer in water bath of LNG SCV[J]. Oil & Gas Storage and Transpotation, 2016, 35(4):406-411.
[3]	HAN D Y, XU Q Q, ZHOU D, et al. Design of heat transfer in submerged combustion vaporizer[J]. Journal of Natural Gas Science and Engineering, 2016, 31:76-85.
[4]	MENG H Y, WANG S Z, ZHOU L, et al. Influence on inlet mass flow rate on heat transfer of supercritical liquefied natural gas in horizontal tubes[J]. Advanced Materials Research, 2014, 960:433-437.
[5]	PARK Y C, Kim J. Submerged combustion vaporizer optimization using entropy minimization method[J]. Applied Thermal Engineering, 2016, 103:1071-1076.
[6]	齐超, 王博杰, 易冲冲, 等. 浸没燃烧式气化器的运行特性及优化[J]. 化工学报, 2015, 66(S2):199-205. QI C, WANG B J, YI C C, et al. Operation characteristics and optimization of submerged combustion vaporizer[J]. CIESC Journal, 2015, 66(S2):199-205.
[7]	李仲珍, 郭少龙, 陶文铨. 超临界LNG管内流动与换热特性研究[J]. 工程热物理学报, 2013, 34(12):2314-2317. LI Z Z, GUO S L, TAO W Q. Studies of supercritical convective heat transfer of LNG in tube[J]. Journal of Engineering Thermophysics, 2013, 34(12):2314-2317.
[8]	张康, 韩昌亮, 任婧杰, 等. SCV蛇形换热管内超临界LNG传热特性数值模拟[J]. 化工学报, 2015, 66(12):4788-4795. ZHANG K, HAN C L, REN J J, et al. Numerical simulation on heat transfer of supercritical LNG in coil tubes of submerged combustion vaporizer[J]. CIESC Journal, 2015, 66(12):4788-4795.
[9]	靳书武, 武锦涛, 银建中. 水平圆管内超临界甲烷对流换热数值模拟[J]. 应用科技, 2015, 42(5):67-71. JIN S W, WU J T, YIN J Z. Numerical simulation of convective heat transfer of supercritical methane in a horizontal tube[J]. Applied Science and Technology, 2015, 42(5):67-71.
[10]	李泓钰. 浸没燃烧式LNG气化器模拟实验研究[D]. 北京:北京建筑大学, 2015. LI H Y. The study of basic characteristics of submerged combustion vaporizer[D]. Beijing:Beijing Architecture University, 2015.
[11]	粘权鑫, 郭少龙, 方文振, 等. 液化天然气浸没燃烧式气化器数值模拟方法研究[J]. 西安交通大学学报, 2016, 50(1):68-72. NIAN Q X, GUO S L, FANG W Z, et al. Numerical simulation of liquefied natural gas submerged combustion vaporizer[J]. Journal of Xi'an Jiaotong University, 2016, 50(1):68-72.
[12]	HAN C L, REN J J, WANG Y Q, et al. Experimental studies of shell-side fluid flow and heat transfer characteristics in a submerged combustion vaporizer[J]. International Journal of Heat and Mass Transfer, 2016, 101:436-444.
[13]	RIBEIRO C P, LAGE P L C. Direct-contact evaporation in the homogeneous and heterogeneous bubbling regimes(Ⅰ):Experimental analysis[J]. International Journal of Heat and Mass Transfer, 2004, 47(17/18):3825-3840.
[14]	MCLINDEN M O, KLEIN S A, LEMMON E W, et al. NIST standard reference database 23:NIST thermodynamic and transport properties of refrigerants and refrigerant mixtures-REFPROP, Version 6.0[DB/CD]. USA:National Institute of Standards and Technology, 1998.
[15]	HAN C L, REN J J, DONG W P, et al. Numerical investigation of supercritical LNG convective heat transfer in a horizontal serpentine tube[J]. Cryogenics, 2016, 78:1-13.
[16]	韩昌亮, 任婧杰, 董文平, 等. 沉浸式汽化器壳程流体传热实验与数值模拟[J]. 化工学报, 2016, 67(10):4095-4103. HAN C L, REN J J, DONG W P, et al. Experimental and numerical simulation on shell side fluid heat transfer in submerged combustion vaporizer[J]. CIESC Journal, 2016. 67(10):4095-4103.
[17]	YU S Q, LI H X, LEI X L, et al. Influence of buoyance on heat transfer to water flowing in a horizontal tubes under supercritical pressure[J]. Applied Thermal Engineering, 2013, 59:380-388.
[18]	CHENG X, KUANG B, YANG Y H. Numerical analysis of heat transfer in supercritical water cooled flow channels[J]. Nuclear Engineering and Design, 2007, 237(3):240-252.
[19]	王珂, 谢金, 刘遵超, 等. 超临界二氧化碳在微细管内的换热特性[J]. 化工学报, 2014, 65(S1):323-327. WANG K, XIE J, LIU Z C, et al. Heat transfer characteristics of supercritical carbon dioxide in a micro-capillary tube[J]. CIESC Journal, 2014, 65(S1):323-327.
[20]	王树立. 鼓泡塔气液两相流的数值模拟与实验研究[D]. 大连:大连理工大学, 2002. WANG S L. Numerical and experimental investigation on gas-liquid two-phase flow in a bubble column[D]. Dalian:Dalian University of Technology, 2002.