Non-isothermal kinetics and characteristics of calcium carbide nitridation reaction with calcium-based additives  

作　　者：Zhihan Zhang Mengxiao Yu Xiaoyu Zhang Jinli Zhang You Han 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China [2]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第4期49-61,共13页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U20A20151 and 21978210);the Haihe Laboratory of Sustainable Chemical Transformations.

摘　　要：The nitridation reaction of calcium carbide and N_(2) at high temperatures is the key step in the production of lime-nitrogen.However,the challenges faced by this process,such as high energy consumption and poor product quality,are mainly attributed to the lack of profound understanding of the reaction.This study aimed to improve this process by investigating the non-isothermal kinetics and reaction characteristics of calcium carbide nitridation reaction at different heating rates(10,15,20,and 30℃·min^(-1))using thermogravimetric analysis.The kinetic equation for the nitridation reaction of additive-free calcium carbide sample was obtained by combining model-free methods and model-fitting method.The effect of different calcium-based additives(CaCl_(2) and CaF_(2))on the reaction was also investigated.The results showed that the calcium-based additives significantly reduced reaction temperature and activation energy E_(a) by about 40% with CaF_(2) and by 55%-60% with CaCl_(2).The reaction model f(α)was also changed from contracting volume(R3)to 3-D diffusion models with D3 for CaCl_(2) and D4 for CaF_(2).This study provides valuable information on the mechanism and kinetics of calcium carbide nitridation reaction and new insights into the improvement of the lime-nitrogen process using calcium-based additives.

关 键 词：lime-nitrogen calcium carbide calciumbased additive thermogravimetric analysis nonisothermal kinetics 

分 类 号：TQ161[化学工程—高温制品工业]