发动机冷却水提高车用天然气罐脱附性能分析

Analysis of improving the desorption performance of natural gas vehicle tank using engine cooling water

摘要:

车用吸附存储天然气脱附过程产生的吸热效应,严重影响天然气脱附效率及汽车行驶速度.采用发动机冷却水来加热储气罐,并通过建立该脱附过程的数值模型,模拟计算了脱附过程中温度、压力、脱附量等参数的变化,论证了发动机冷却水用于补充脱附过程所需热量的可行性.结果表明:在脱附放气过程中,用发动机冷却水加热储罐壁面,可以提高储罐的平均温度,改善储罐的温度场,增加脱附量.适当增加内部换热管的管径,增加吸附剂的导热系数,均能增加储罐的脱附量.

Abstract:

Endothermic effects in desorption process of natural gas vehicle tank seriously affects the gas desorption efficiency and vehicle speed.In this paper,a numerical model in desorption process of heating natural gas vehicle tank by engine cooling water was established,and by which the desorption processes were calculated.It shows that when the tank is heated by the engine cooling water,the rising of temperature makes the desorption amount of natural gas increased obviously.Also,the increasing of diameter of internal cooling pipe and thermal conductivity of adsorbent can increase the desorption amount.