Li Wei, Peng Jinhui, Zhang Libo, Yang Kunbin, Xia Hongying, Zhang Shimin, Guo Sheng-hui
Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, PR China.
Waste Manag. 2009 Feb;29(2):756-60. doi: 10.1016/j.wasman.2008.03.004. Epub 2008 May 1.
Experiments to prepare activated carbon by microwave heating indicated that microwave energy can decrease reaction temperature, save the energy and shorten processing time remarkably compared to conventional heating, owing to its internal and volumetric heating effects. The above results were based on the laboratory-scale experiments. It is desirable to develop a pilot-scale microwave heating equipment and investigate the parameters with the aim of technological industrialization. In the present study, the components and features of the self-invented equipment were introduced. The temperature rise curves of the chars were obtained. Iodine numbers of the activated carbons all exceed the state standard of China under the following conditions: 25 kg/h charging rate, 0.42 rev/min turning rate of ceramic tube, flow rate of steam at pressure of 0.01 MPa and 40 kW microwave heating power after 60 kW pre-activation for 30 min. Pore structure of the sample obtained at a time point of 46 h, which contained BET surface area, and pore size distributions of micropores and total pores, was tested by nitrogen adsorption at 77K.
通过微波加热制备活性炭的实验表明，由于微波的内加热和体加热效应，与传统加热相比，微波能量可以降低反应温度、显著节省能源并缩短处理时间。上述结果基于实验室规模的实验。为了实现技术产业化，开发中试规模的微波加热设备并研究相关参数是很有必要的。在本研究中，介绍了自主研发设备的组成部分和特点。获得了炭的升温曲线。在以下条件下，活性炭的碘值均超过中国国家标准：进料速率为25 kg/h，陶瓷管转速为0.42转/分钟，蒸汽压力为0.01 MPa，在60 kW预活化30分钟后微波加热功率为40 kW。在46小时这个时间点获得的样品的孔结构，包括BET表面积以及微孔和总孔的孔径分布，通过77K下的氮气吸附进行了测试。
