活性炭微波加热制备装置的仿真设计

活性炭在石化、电力、化工、临床医疗、环保等多个行业中广泛应用,其市场需求量也与日俱增.研究表明,相对于传统方法,微波法制备的活性炭具有孔隙结构更发达,比表面积更大,孔隙结构分布更均匀等优势.然而,这些研究都局限于实验室层面,现有的微波加热装置普遍存在热点、热失控和加热效率低下等问题.这严重限制了微波能在活性炭工业制备中的大规模应用.针对上述问题,本文以国内大量存在的竹子为研究对象,提出了一种可用于活性炭制备的微波均匀加热装置设计方案.通过多物理场仿真计算,以原材料的受热均匀性及装置的能量馈入率为考核标准,采用参数扫描分析的方法对装置参数进行了优化,得到了S11参数为-26.81dB,温度场的变异系数为0.2834的加热装置.此外,本文还结合参数扫描过程以及不同算法的运用,验证了该仿真计算的鲁棒性和准确性.该文章的工作对当前的活性炭工业制备装置的设计具有重要指导意义.

Simulation of microwave heating device for activated carbon preparation

The demand of activated carbon is huge and increases exponentially, due to its extensive use in petrochemical, electric power, chemistry engineering, clinical medical treatment, environmental protection, and so on. Researches have shown that, comparing with traditional methods, the microwave-assisted produced activated carbons have more well-developed pores, larger specific surface area and more uniform porous structures. These researches, however, are confined to the laboratory level. The existed microwave heating devices have the ubiquitous problems like hot spot, thermal runaway and low heating efficiency, which impede the large-scale application of microwave energy in the activated carbon industry. In view of these problems, this paper, based on the domestic bamboo, proposed a design of microwave uniformly heating apparatus for bamboo based activated carbon production. With multi-physics calculation and the evaluation standards of heating uniformity of materials and the energy feed rate, the device parameters are optimized and a heating equipment is obtained with S11 of -26.81dB and temperature variation coefficient of 0.2834. Besides, this paper also verifies the robustness and accuracy of this simulation model with sweeping parameters and applying different numerical simulation methods. This work may present guiding significance for the design of large-scale microwave heating devices in the activated carbon industry.