甲烷吸附储存条件下状态方程的选用

Selecting the equation of state in the case of methane adsorption storage

在评估ANG储气性能的研究中,选择恰当的状态方程非常重要。采用容积法测试装置考察了甲烷吸附储存条件下各种气体状态方程的适用性。通过对比分析,在室温、0～8MPa条件下,运用理想气体状态方程、SRK状态方程、PR状态方程、维里方程和RK方程计算求得的体积比相对偏差分别为10.097%、1.230%、1.475%、2.288%和0.248%,其中利用RK状态方程计算求得到的体积比相对偏差最小,是在实验压力范围内完全适用于甲烷吸附储存研究的状态方程;若实验压力不超过4MPa,则维里方程和SRK方程也可适用。

It is important to select the suitable equation of state in the research process of evaluating storage performance of ANG(adsorption natural gas).Five different equations of state,ideal gas EOS,Virial EOS,Peng-Robinson(PR)EOS,RedlichKwong(RK)EOS,and Soave-Redlich-Kwong(SRK)EOS,are given in the paper.The volumetric method test device has been used to investigate the applicability of various equation of state in the case of methane adsorption storage.In the case of room temperature,0～8 MPa,the relative deviation of volume ratio is at 10.097%,1.230%,1.475%,2.288 % and 0.248% when the ideal gas/SRK/PR/Virial/RK equations of state have been used respectively.The minimum relative deviation is obtained when the RK equation of state is adopted.And it is completely suitable for the study of methane adsorption storage.If the test pressure is not more than 4 MPa,the Virial and SRK equation of state will be also applicable.