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将常规引射式低压加热器的圆柱形混合室改为渐缩型混合室,研发了一种新的渐缩型混合室引射式低压加热器,通过理论计算分析了进口参数和喉部直径对该装置加热和升压性能的影响,并将出口水温与试验结果进行了比较.结果表明:在蒸汽压力不变时,增大入水压力,加热器出口温度下降,出口压力升高,并均呈减缓趋势;当入水参数不变时,增大蒸汽压力,加热器引射系数增大,出口温度升高,但蒸汽流量对出口压力影响不大;增大混合室喉部面积可以降低出口压力,有利于提高加热器变工况运行下加热性能和实际运行的稳定性.
The cylindrical mixing chamber of a conventional ejector low pressure heater was changed to a tapered mixing chamber. A new tapered mixed chamber ejector low pressure heater was developed. The inlet parameters and throat diameter The results show that when the steam pressure is constant, the inflow pressure is increased, the outlet temperature of the heater is decreased and the outlet pressure is increased, both of which When the influent parameters are constant, the steam pressure increases, the ejector coefficient increases and the outlet temperature increases, but the steam flow has little effect on the outlet pressure. Increasing the throat area of the mixing chamber can reduce the outlet pressure , Which helps to improve the heating performance and the stability of the actual operation of the heater under variable working conditions.