英语翻译

题目

英语翻译
In most cases,the volume flowrate through the
steam expander is no greater than that through the
turbine.It should be noted that in the case of the watercooled
system,not only is the Hexane turbine very
large,but the condensing temperature is only 0.3 bar,
which means that the ORC system would have to be
completely hermetically sealed in order to prevent
problems with maintaining a vacuum in the condenser.
This is normally achieved by the turbine being
directly linked to a high-speed generator with an invertor
control to produce output at 50/60 Hz.Such units
are expensive.Incontrast,the screwexpander could be
coupled directly to a two-pole generator or through a
low-cost belt drive and its cost would be only a fraction
of that of the equivalent turbine.

答案

在多数情况下,通过蒸汽机的容积流率不会大于通过涡轮机的容积流率.需要注意的是,在水冷系统的情况下,不仅己烷涡轮机非常大,而且冷凝温度只有0.3bar,意味着ORC系统必须完全严格的密封从而防止在保持冷凝器真空时会出现的问题.通常涡轮机会直接和一个高速发电机链接并通过逆变器来控制输出功率为50、60赫兹.这些机器都很昂贵.相反的,螺杆膨胀机可以直接和一个两级发电机链接或通过低价的皮带传动链接.这样的话价格只相当于涡轮机的一部分.
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