[关键词]
[摘要]
为研究LNG闪蒸气在低温储存环境下的吸/脱附特性及热效应,基于格子玻尔兹曼方法建立了多孔介质内闪蒸气流动传热传质的数值模型,并考虑闪蒸气在多孔介质表面的吸附作用和内部微晶孔扩散作用及传热效应,分析不同孔隙率多孔介质材料的闪蒸气低温吸附热力学特性。结果表明:闪蒸气的吸附作用使多孔介质温度明显升高,吸附速率与孔隙率呈负相关,吸附量和温度变化受孔隙率影响较小;环境热量驱动下闪蒸气从多孔介质中脱附,通过脱附吸热抵消了约45%的外部漏热侵入,且随着孔隙率增大闪蒸气脱附吸热效应增强。
[Key word]
[Abstract]
To investigate the adsorption/desorption characteristics and the thermal effects of liquefied natural gas (LNG) boiloff gas in lowtemperature storage environment,a numerical model for boiloff gas heat and mass transfer by flow in porous media was established based on the lattice Boltzmann method,incorporating with the adsorption of boiloff gas on porous media surface,the diffusion in internal microcrystalline pores and the heat transfer effects.The adsorption thermodynamic property of the lowtemperature boiloff gas of porous media with different porosities was analyzed. The results show that the adsorption of boiloff gas significantly raises the porous media temperature,and the porosity is negatively correlated with the adsorption rate but has little impact on the adsorption amount and adsorbent temperature; the environmental heat causes the desorption of boiloff gas from porous media,which adsorbs heat and removes about 45% of the external leakingin heat,with the increase of the porous media porosity,the heat adsorbing effect by the desorption of boiloff gas is enhanced.
[中图分类号]
TK221
[基金项目]
国家自然科学基金(52001207)