化工学报2016，Vol.5Issue(5)：1771-1777,7.DOI:10.11949/j.issn.0438-1157.20151702
高温高压喷雾闪蒸的蒸发特性
Evaporation characteristics of spray flash evaporation at high temperature and high pressure
摘要
Abstract
The influence of initial and operating conditions on spray flash evaporation characteristics was investigated based on a new high-temperature and high-pressure spray flash evaporation system. Water was used as the working fluid. The initial liquid temperature was raised to above 100℃ and the pressure inside the flash chamber was maintained positive for the first time. A specially-designed swirl nozzle with two S-shaped internal vanes was used to inject liquid upward or downward into the flash chamber. The experiments were conducted at initial temperatures ranging from 135 to 150℃, pressures of 121, 126, 131, 136, 141 and 146 kPa and superheats from 30 to 46℃. The results indicated that the mass flow rate of vapor generated by flashing increased with the increase of initial temperature and decreased with the increase of pressure. Downward injection outperformed upward injection for higher vapor generation rate and less water carried out by vapor. The flash efficiency was found to increase linearly with the degree of superheat. An empirical equation between flash efficiency and the degree of superheat was proposed based on a large amount of experimental data. The results provided reference for the application of spray flash evaporation at high temperature and high pressure in industrial fields.关键词
喷雾闪蒸/高温高压/影响因素/闪蒸效率/相变/两相流/蒸发Key words
spray flash evaporation/high temperature and high pressure/influencing factors/flash efficiency/phase change/two-phase flow/evaporation分类
能源科技引用本文复制引用
季璨,王乃华,崔峥,程林..高温高压喷雾闪蒸的蒸发特性[J].化工学报,2016,5(5):1771-1777,7.基金项目
国家重点基础研究发展计划项目(2013CB228305).supported by the National Basic Research Program of China ( 2013CB228305). （2013CB228305）
