车用天然气储罐脱附放气过程热力特性分析

Thermodynamic Properties Analysis of Natural Gas Vehicle Tank in The Process of Desorption

摘要:

为了研究车用吸附天然气储罐在脱附放气过程中热力参数的变化，以及对脱附速率和最大脱附量的影响，建立了天然气、活性炭吸附剂以及天然气储罐的热质交换模型，通过数值模拟求解，模拟计算了脱附过程中储罐内温度、压力和脱附量的变化，分析了影响脱附量的因素，计算结果表明，脱附过程是吸热过程，脱附过程储罐中心处温降最大，可降低49K，此时脱附效率比等温脱附减少24.49%，脱附速度越大，壁面提供的热量越少，脱附效率也越低。本文的研究成果能为天然气汽车行驶过程，消除脱附热效应措施的提出，提供理论依据。

Abstract:

In order to study thermal parameters changes of the adsorbed natural gas vehicle tanks in the desorption deflated process and the influence of desorption rate and the maximum amount of desorption, heat and mass transfer model of natural gas, activated carbon adsorbents and gas tank are established. Adsorption-desorption processes are calculated within the storage tank temperature, pressure and adsorption amount of change through numerical simulation. In this paper, the author also analyzes the factors affecting the amount of adsorption and desorption, provides theoretical references for proposing the measures of thermal desorption effect. The results show that the desorption process is endothermic process, the average temperature of adsorbent reduced from 293.15K reduced to 250.46K at the end of the desorption process. Among them, the largest temperature drop is at the center of the tank, reduced 49K to 244K. At the same time, the efficiency of desorption meets a reduction of 24.49% than in the isotherm desorption. The faster the desorption process, the less the heat provided by the wall and the lower the efficiency of desorption.