绝热床中结炭B02催化剂烧炭再生过程模拟研究（第Ⅱ报）

Simulation of Regeneration Process of Coked B02 Catalyst in Adiabatic Beds Ⅱ In the Presence of Water Vapor and Air

以工业两段绝热床中运行近４０００ｈ的已结炭Ｂ０２催化剂为对象，以曾得到的水蒸汽存在下的烧炭再生本征动力学模型为基础，并考虑到内扩散的影响，建立了工业绝热床反应器烧炭再生过程的模型，并利用正交配置法求解．对两段绝热床反应器分别进行的计算机模拟结果表明，采用水蒸汽与空气混合气烧炭，当气速一定时，存在一临界人口温度；当人口温度一定时，存在一临界气速．只有在人口温度不高于临界值且气速不低于临界值时，才能进行安全烧炭再生．为寻求最佳烧炭条件，提出了５种并选定其中一种较优的再生方案，可作为制订工业绝热床烧炭再生工艺条件的参考．

his paper mainly deals with regeneration of the coked B02 catalyst after 4 000 h run in the series of two industrial adiabatic beds. On the basis of both the intrinsic kinetic model and internal diffusion involved, models for the regeneration solved by using orthogonal collocation method. The process of the coked B02 catalyst in the series of two adiabatic beds were established and simulated results indicate that there is a critical inlet temperature (for the first bed: 617 K, for the second bed: 604 K) at a certain gas flow rate 1.000 kg/(m2·s), and a critical gas flow rate for the first bed: 0.524 kg/(m2·s),for the second bed: 0. 670 kg/(m2·s) at the inlet temperature 573 K. Hence,for safe coke burning, the highest temperature in the beds is lower than 673 K. Finally, from 5 optional operation conditions, better one was chosen to provide a reference for practical regeneration of industrial adiabatic beds.