Analysis the character of hydrodynamic calculation for natural circulation of industrial boiler and give the recommendation of calculation method for simple and complex circulationcircuit.
分析工业锅炉自然循环的水动力计算特点，对简单及复杂循环回路的计算方法提出建议。
2
Based on the monostable circuit, using the IC NE555, a kind of hot water circulation automatic heat preservation system was designed.
利用时基ic NE555接成的单稳态电路，设计了一种热水循环自动保温系统。
3
Morever, new technolo-gies such as slurry-recycling method and semi-closed circuit water circulation for cooling sys-tem were adopted reducing water consumption greatly.