摘要
流体在临界点附近参数区域,其黏性系数、比热容、导热系数、密度等热物理性质都会发生剧烈变化,因此超临界流体在多孔介质中的渗流特性较为复杂,常规流体多孔渗流压降特性规律能否适用有待于验证。以超临界水煤气化技术为代表的一系列高新技术的发展对多孔介质中超临流体的渗流特性的认识提出了更高的要求。本文考察了典型操作参数(温度300~450℃,压力22.7~25 MPa,流量0.8~3 kg.h^(-1))对多孔介质中超临界水渗流压降特性的影响。研究结果表明:Ergun公式在估算多孔介质中超临界水渗流压降的过程,黏性项被高估,惯性项被低估。本工作有望为超临界水煤气化技术中超临界水流化床的设计提供依据。
The thermo physical properties of fluids such as viscosity coefficient,specific heat capacity,thermal conductivity,density change dramatically near the critical point.Thus the law of pressure drop characteristics of supercritical water seepage in porous media is complex and the fitness of porous seepage pressure drop characteristics of traditional fluid needs to be verified.Coal supercritical water gasification technology as one representative of high-tech development demands further investigation on pressure drop characteristics of supercritical water seepage in porous media.The effects of the typical operating parameters（temperature 300450℃,pressure 22.725 MPa,flow rate 0.83 kg·h-1）on the pressure drop characteristics of supercritical water flowing in porous media were systematically studied.The experimental results showed that the viscous term was overestimatedand the inertial termunderestimated when the Ergun formula was used to estimate the pressure drop for the pressure drop of supercritical water flowing through porous media.It is expected that the study provide the basis for the design of the supercritical water fluidized bed in coal supercritical water gasification technology.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第1期99-103,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金青年基金项目(No.51306145)
教育部博士点基金资助(No.20120201120064)
关键词
超临界水
多孔介质
渗流
压降特性
supercritical water
porous medium
seepage
pressure drop
