为探索缓解家庭用ANG储罐在使用过程中受热效应影响的热管理措施,在温度区间263.15K～313.15K、压力范围0MPa～8MPa,测试了甲烷在比表面积为2074m2·g-1的SAC-02椰壳活性炭上的吸附平衡数据,并由Toth方程确定了相应的绝对吸附等温线.其次,在室温、3.5MPa、5L·min-1～25L·min-1的甲烷流率下,对装填有390g活性炭、中心区域布置U型换热管的储罐进行充气试验.结果表明,Toth方程在试验范围内的预测相对误差小于3.25％；储罐吸附床压力的上升速率是影响实际充气流率、吸附床温度变化和充气总量的关键因素；在试验范围内,U型管内循环30℃的冷却水可降低吸附床的平均温度和最大温升约3.6℃和7.3℃,但仅能提高约6.5％的总充气量.Toth方程可用于分析甲烷在活性炭上的吸附平衡,延长储罐吸附床压力上升至充气压力的时间可改善ANG储罐的充气性能.%To obtain effective measures for managing the thermal effect during the charging process of domestic adsorbed natural gas (ANG) tanks, isotherms of methane adsorption on the coconut shell activated carbon SAC-02 adsorbent which had an average specific surface area of 2074m2·g-1 were firstly measured volumetrically at 263.15K-313.15K and 0MPa-8MPa, and Toth equation was then employed to model the corresponding isotherms of absolute adsorption. A storage tank, which was specially designed with a U-shaped heat exchanging pipe round the central region and packed with 390g activated carbon, was undertaken charging tests of methane under the flow rate of 5L · min-1 to 25L · min-1 at ambient temperature and 3.5 MPa. The results showed that the modified Toth equation could predict the experimental data with a relative error less than 3.23%. The results also revealed that the increasing rate of pressure within the storage tank directly influenced the in-charging rate of methane, the temperature fluctuation of the adsorbent bed as well as the charging amount of the methane. However, circulation of the cooling water at 30℃ within the central region of the tank could only increase the total charging amount by about 6.5% due to the adsorbent bed relative smaller mean and maximum temperature drops of about 3.6% and 7.3℃, respectively. The conclusions were drawn that Toth equation could be used to study the adsorption equilibrium of methane on activated carbons, and prolonging of the duration of pressure increasing within the adsorption tank was crucial to weaken the thermal effect on a domestic ANG system during the charging process.
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