Numerical Calculation Of Heat And Mass Transfer In Adsorbent Bed For Natural Gas

ANG is a kind of new technology to adsorb natural gas. It can be used to natural gas vehicle and adsorb some scattered associated gas. It can decrease the cost of money. Quantity of ANG at 3~4MPa is equal to the CNG at 13~14MPa. In charge and discharge process, it shows heat effect. The heat of adsorption is about 16kJ/mol. It influences adsorption capability about 20%.This paper mainly discussed the effects of heat of absorption during charge and discharge process. They were analyzed the temperature field of storage vessel, comparing several heat exchanges with different structures and the temperature variation at different boundary conditions, in order to optimize the structures of storage vessel and summarize the change of parameters in adsorption dynamics. The main contents are as follows:1. This thesis presented different heat exchange structures in storage vessel. The CFD software FLUENT was used to simulate the temperature fields in charge process; also it evaluated techno-methods to restrain the effects of heat of absorption. The main parameters included structure parameters of storage vessel and physical characters of activated carbon. It offered guidance to indoor experiments on theory.2. Considering the actual experiment structures, analyzed the variation of temperature on different radial positions. Storage vessels with heat exchanging structures and without heat exchanging structures showed different temperature fields, and also compared them with experimental results.3. The FORTRAN language was used to the coupling calculation between adsorption equation and partial differential equation of heat conduction. Input the structure parameters, physical characters and boundary conditions, we can get the temperature variation, absorbed mass variation and the velocity of heat of adsorption. The simulated results revealed that decreasing charging velocity was good to adsorption of gas.The purpose of this paper is simulating temperature fields of different heat exchange structures in storage vessel in order to find some feasible approaches to offset the performance loss. The simulating results revealed that using heat exchange structures in storage vessel could significantly moderate the heat effect in charge and discharge progress.