DESIGN AND OPERATION OF EXPERIMENTAL SYSTEM FOR STUDYING HEAT TRANSFER IN A SMOOTH TUBE AT NEAR AND SUPER CRITICAL PRESSURES
Boilers running at supercritical pressure with large capacity have been widely used in power generation technology. How to keep the safety of heat transfer in the riser system is an important issue. However, it is difficult to study heat transfer for the vertical smooth tubes in a boiler at sub-critical or supercritical pressure since the thermodynamic properties of water is very complex and sensitive to temperature and pressure near the critical point. Hot-state experiment of heat transfer for the tubes of diameter used in a boiler is of great value for the design of membrane wall. In order to study the heat transfer of vertical smooth tubes running at low heat flux and low mass flux for sub-critical CFB boilers, a near-supercritical pressure water test rig was built in Tsinghua University. The designed pressure is 21MPa, the mass flux of water is 550kg/m2s, and the heat flux is 136kW/m2. In this paper, the design and structure of the test bed is introduced. The experimental result is analyzed, more experimental work is needed in future research.
near-critical pressure two-phase flow heat transfer crisis
W.K.Li Y.X.Wu Y.Li J.F.Lu H.Zhang
Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua Universit Key laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua Universi
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
357-360
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）