活性炭/膨胀石墨固化混合吸附剂导热和渗透性能测试

Study on Thermal Conductivities and Permeabilities of AC/ENG Consolidated Composite Adsorbents

为了提高活性炭吸附剂的传热性能,同时不影响其传质特性,选择6种不同粒径的活性炭吸附剂,并按5种比例制备了活性炭/膨胀石墨固化混合吸附剂,采用稳态法,对样品进行了导热系数、渗透率的性能测试.研究表明:在600 kg/m3的密度下,不同粒径活性炭吸附剂导热系数基本维持在0.36 W/(m.K)的恒定值,渗透率随着粒径的增大而增大;活性炭/膨胀石墨固化混合吸附剂的导热系数最高可达2.61 W/(m.K);随着活性炭比例的升高,导热系数逐渐减小,渗透率逐渐增大;当活性炭比例达到最大的71.4%(2.5∶1.0)时,导热系数为2.08 W/(m.K)、渗透率为51.6μm2,相比颗粒状活性炭,其导热系数提高了5.6倍.

In order to improve the heat transfer performance and at the same time not to influence the mass transfer performance of the AC（activated carbon） adsorbent bed,six different sizes of AC grains were studied and five kinds of AC/ENG consolidated composite adsorbents were developed.Meanwhile,thermal conductivity and permeability of samples were tested with steady state method.Under the density of 600 kg/m3,all the thermal conductivities of AC grains has a constant value of 0.36 W/（m·K）,while the permeability grows with the size of the grains.The highest thermal conductivity of AC/ENG consolidated composite adsorbents is 2.61 W/（m·K）,however,the value drops and permeability grows with the ratio of AC increased.When AC reaches the maximal ratio,71.4%,the thermal conductivity is 2.08 W/（m·K） which is increased by 5.6 times compared with the AC grains,and the permeability is 51.6 μm2.