氧热法电石生产气流床反应器性能的数值模拟  

Simulation of the reaction performance of a fluid bed reactor for oxygen-heated calcium carbide production

作　　者：于洋[1] 李文涛[1] 窦雅玲[1] 刘辉[1] 

机构地区：[1]北京化工大学化学工程学院化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第3期27-31,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家"973"计划(2011CB201306)

摘　　要：针对氧热法电石生产工艺中气流床反应器内的燃烧放热和电石生成的吸放热耦合体系,建立了包含传质、传热和反应的多相反应器模型,基于模拟重点考察了反应器几何参数和操作条件对器内传递和反应性能的影响。结果表明:(1)气体通过气流床中的预热段、扩大段时,温度达到1000 K以上,反应段的局部温度达到3000 K以上,可以满足原料预热和电石合成需要的温度;(2)焦炭的粒度增大,其火焰中心位置下移,可以更好地为底部电石合成反应提供热量;但是焦炭的粒度增大,气体出口温度变大,能量没有得到充分利用;(3)适宜焦炭粒度为120μm,对合成电石和减小能耗有利。A fluid bed reactor model was set up for simulating transport and reaction performance of the oxygen-heated calcium carbide synthesis process,where the endothermic calcium carbide synthesis is coupled with the exothermic coke combustion.The effects of geometrical and operational design parameters were investigated based on simulation results.It was found that：（1） the gas temperatures are above 1000K after going through the pre-heating and expansion regions,and local temperatures in the reaction region are over 3000K.This temperature distribution meets the requirements for preheating the raw materials and calcium carbide synthesis.（2） The flame centre descends with an increase in coke particle size and hence provides more heat for calcium carbide synthesis,but the outlet temperature of the gas increases,leading to a loss of energy.（3） 120 μm is the optimum coke particle size considering both the synthesis reaction and the need to reduce energy consumption.

关 键 词：电石合成 气流床反应器 数值模拟 焦炭粒度 火焰中心 

分 类 号：TQ018[化学工程]