超临界压力下浸没燃烧式气化器传热特性计算分析  

Calculation and Analysis on Heat Transfer Characteristics of Submerged Combustion Vaporizer at Supercritical Pressure

作　　者：潘杰[1] 张丽 白俊华 唐凌虹 李冉[1] 吴刚[1] PAN Jie;ZHANG Li;BAI Jun-Hua;TANG Ling-Hong;LI Ran;WU Gang(College of Petroleum Engineering,Xi'an Shiyou University,Xi'an 710065,China;Factory of Producing and Selling Natural Gas,SINOPEC Zhongyuan Oilfield Company,Puyang 457000,China)

机构地区：[1]西安石油大学石油工程学院,西安710065 [2]中原油田石油工程技术研究院,濮阳457001

出　　处：《工程热物理学报》2019年第9期2162-2169,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51774237,No.51304160);陕西省自然科学基础研究计划项目(No.2019JQ-285);陕西省教育厅科研计划项目(No.15JK1581)

摘　　要：浸没燃烧式气化器(submerged combustion vaporizer,SCV)作为气化装置被广泛应用于液化天然气(liquefied natural gas,LNG)气化站和接收终端。本文针对SCV管程/壳程耦合传热过程,基于能量平衡建立了考虑水浴侧结冰影响的分布参数模型。通过上述数值模型对SCV在超临界压力下的传热特性进行了计算分析,并讨论了运行参数和传热强化措施对其传热性能的影响。计算结果表明:SCV在超临界压力下具有良好的传热性能,能够在较低的水浴温度条件下实现LNG的加热气化;传热管束下部温度较低,管壁外表面出现了结冰现象且冰层厚度沿管长方向不断减小直至表面冰层消失。LNG压力、运行负荷、入口LNG温度等运行参数对SCV传热特性具有显著影响。纽带和螺旋线圈均能显著强化传热管内LNG侧对流传热并提高SCV的传热性能。综合考虑传热强化措施对传热和阻力的影响,选择75°螺旋线圈比45°纽带和45°螺旋线圈具有更好的效果。SCV as regasification unit is widely equipped in LNG vaporizing stations and receiving terminals.In this paper,an energy balance-based distributed parameter model considering icing effects was established for estimating the coupled heat transfer between tube-side and shell-side in SCV.Based on this model,the heat transfer characteristics of SCV under supercritical LNG pressure was numerically calculated and analyzed,and the effects of operating parameters and heat transfer enhancement measures on the thermal performance were discussed.The results indicated that SCV has good heat transfer performance under supercritical pressure,can achieve LNG gasification at low water bath temperature conditions.The ice formed outside the lower part of LNG heat transfer tube bundle due to low temperature,and the ice thickness decreases continuously along the tube length until disappears.The operation parameters including LNG pressure,operating load,inlet LNG temperature,have significantly different influences on the heat transfer characteristics of SCV.The twisted tape insert and wire coil insert can enhance the convective heat transfer of LNG flowing in heat transfer tube bundle markedly.The wire coil insert with a helix angle of 75° is a better choice than the twisted tape insert with a helix angle of 45° and the wire coil insert with a helix angle of 45° considering its effects on both heat transfer and flow resistance.

关 键 词：浸没燃烧式气化器 分布参数模型 传热特性 超临界压力 数值计算 

分 类 号：TK124[动力工程及工程热物理—工程热物理]