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The work had been carried out can be summarized as follows: 1. Thermal cycle analysisBased on the classical thermodynamics, influence of isobaric reheat and isovolumetric reheat on cycle output is discussed. Based on the finite time thermodynamic theory, the thesis discusses the optimization of Rankine cycle, Brayton cycle and Stirling cycle between constant temperature heat source and constant temperature heat sink or between variable temperature heat source and constant temperature.

第一、循环优化分析:采用经典热力学研究了等压再热与等容再热对循环功的影响;采用有限时间热力学深入研究了恒温热源一恒温冷源和变温热源一恒温冷源液氮发动机朗肯循环、布雷顿循环和斯特林循环的优化和对比;着重研究了工质导热率与热机换热器总导热率之比对循环性能的影响、高温侧换热器导热率与低温侧换热器导热率之比对循环功率的影响等内容;得到了一些对循环和系统设计具有现实指导意义的结论。

The invention relates to a processing method of preventing frostbite and restarting of hydrogen electric pile, whose characteristic lies in the treating processes includes: When the electric pile turns off, the unsaturated fuel gas or the nitrogen, through the circle boast to clean the dissociate water; drying the MEA film module to keep the water content below the stipulated temperature which does not ice up; then the recycle gas through a wet exchanger to dry and the dried gas is continue used in the dry pile step; when restarting the electric pile, the recycle gas must heats then through the pile to elevate the temperature, then heats the fuel gas and the oxidant of the gas source, through the weting of the wet exchanger enters to the calefactive pile, enhances the wet step of the film module in the pile, starts the power output of the pile.

本发明涉及一种氢电堆的防冻和重新启动时的处理方法,其特征在于处理过程包括:电堆停机时,将水蒸气不饱和的燃料气体或氮气,通过循环吹扫除去电堆的游离水;干燥其中的MEA膜组件,使膜组件含水量降低到规定低温下不结冰的程度;而后再令循环气体通过一个湿交换机将循环气体干燥,以及被干燥后的循环气体继续用来干燥电堆的步骤;在电堆重新启动时,须将循环气体加热后通过电堆,使电堆升温,然后再将气源的燃料气及氧化剂加热,通过湿交换机加湿后进入已升温的电堆,提高电堆中膜组件的湿度的步骤,开始电堆的功率输出。

On the basis of same main components, comparison and analysis are performed on thermodynamic performance of HAT cycle, STIG (Steam-Injected Gas Turbine) cycle, gas-steam combined cycle and the relevant cycles with intercooling or reheat.

在主要部件相同的基础上,分析比较了HAT循环、注蒸汽燃气轮机循环、燃气—蒸汽联合循环以及各循环采用中冷或再热手段后相应循环的热力性能,确定了再热HAT循环高效率和中冷再热STIG循环高比功的优势,指出中冷手段对循环性能改善不大,回收中冷热量也不会收到好的效果,而再热手段对循环性能改善显著。

Presents the comparison between the thermodynamic performance of oil-burning closed STIG cycle and integrated gasification closed STIG cycle and analysis of the influence of reheating on efficiency of the two cycles and concludes that for IGCSTIG cycle, reheating can improve the efficiency only at lower inlet temperature of turbine and higher pressure ratio.

给出了燃料改用煤气后,燃油的与燃煤气的闭式注蒸汽燃气轮机循环的性能比较,同时分析了两循环分别采用一次中间再热后,再热措施对两循环热效率的不同影响。

22 If air is recirculated to production areas, appropriate measures should be taken to control risks of contamination and cross-contamination.

4.22 如果空气再循环到生产区域,应当采取适当的控制污染和交叉污染的风险。

If air is recirculated to production areas, measures shall be taken to control recirculation of dust from production.

译:如果空气是再循环到生产区,应测量尘埃含量,控制从生产区带来的尘埃。

In many microbiology laboratories air is not recirculated but is exhausted directly.

在许多微生物实验室中,空气并不进行再循环,而是直接排放出去。

RECIRCULATED AIR, Conditioned air mixed with air from the passenger compartment.

再循环空气,调制后的空气与客舱来的空气之混合。

In the spark-ignition engine, recirculating some of the exhaust gas reduces the emission of nitrogen oxides.

在火花点火的发动机中,再循环的一部分废气减少了氧化氮的有害污染物。

Our design goals were (1) a low cost design leveraging recycled components (2) large printable volume emphasized over high resolution, and (3) ability to use low-cost printing media including granulated sugar.

我们的设计目的是:1、低成本设计补充了再循环部分;2、大量的可印刷的卷册强调的是高分辨率;3、能够利用包括砂糖的低成本印刷媒介。

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