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Study on the Temperature Rise during the Fast Filling Process of70MPa Hydrogen Vehicle Cylinder

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Tutor: ZhaoYongZhi
School: Zhejiang University
Course: Chemical Process Equipment
Keywords: 70MPa,Vehicle,Hydrogen storage cylinder,Fast filling (refueling),Temperaturerise
CLC: U469.7
Type: Master's thesis
Year:  2012
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Abstract:
For the commercialization demand of500km driving-range,70MPa hydrogen vehicle cylinders are widely adopted in the demonstrated hydrogen vehicles by the related American and Japanese research institutes. Unfortunately, for the commercialization demand of filling rate (5kg,3min), there will be significant temperature rise within the70MP vehicle cylinder during the filling process, which may cause the degradation of the carbon fiber reinforced polymer. Therefore, the issues on the temperature rise caused by fast filling of70MPa hydrogen vehicle cylinder have become one of the key problems of hydrogen vehicle technologies.In this paper, the main influence factors on the temperature rise during fast filling of70MPa hydrogen vehicle cylinder are investigated through the thermodynamic analysis. Based on reasonable simplifications for fast filling process, a numerical simulation model for predicting fast filling process of70MPa hydrogen vehicle cylinder is presented and validated in both2-dimensional axisymmetric and3-dimensional forms, which has considered turbulence, real gas effect and solid heat transfer issues. Through the numerical analysis method, the influences of various filling conditions and structures on temperature rise within the cylinder are analyzed. The influence principles and preliminary strategies of hydrogen temperature are obtained. Main conclusions are described as follows:(1) The value of hydrogen temperature rise during fast filling of70MPa hydrogen vehicle cylinder depends on the heat from compression and throttling effects, environment heat exchange and the internal energy from kinetic energy conversion.(2) Because of the high specific heat and low thermal conductivity of high-density polyethylene (HDPE), the heat dissipation rate of type IV cylinder is much lower than that of type ¢ó one, which is much dangerous during the fast filling process of70MPa hydrogen vehicle cylinder.(3) By analyzing the temperature rise mechanisms during fast filling of70MPa hydrogen vehicle cylinder and investigating the effects of filling conditions, preliminary strategies of temperature rise control are presented: Firstly, pressure rising rate can be reasonably reduced to extend the heat dissipation time; Secondly, hydrogen gas can be pre-cooled before filling into cylinder in order to reduce the final temperature within the cylinder; Thirdly, to improve the temperature homogeneity of hydrogen gas, structure design of cylinder can be optimized.The works of this paper can provide guidance for the temperature rise control of70MPa hydrogen storage system and optimization of fast filling conditions for fuel cell vehicle (FCV), and offer necessary theory and numerical methods for guiding safe operation and standards formulation of FCV hydrogen storage system.
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