对由太阳能集热器热水自然循环加热的太阳能热转换系统卵石层的热特性进行了实验研究。
Thermal characteristics of the gravel layer in the system heated by hot water natural circulation with solar collector were studied.
将使用蒸汽喷射器替代热水循环泵对除氧加热系统进行循环加热的效果进行了对比，认为应用蒸汽喷射器可以起到节能、安全、高效、方便的作用。
The results of circulated heating of the deaeration heating systems were com-pared by using steam injector to replace the hot water circulation pump.
回收部分的最后一步与加热和制浆的生产过程的最后一步相似——在循环再次开始之前。
The last step in the recycling section is similar to the last step in the production process with heating and pulping—before the cycle begins again.
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