Numerical Calculation Of Ctructural Type And Structural Parameters Of MgCl2 Pyrolysis Reactor Pilot Plant

China is rich in salt lake resources.At present,the known magnesium reserves in Qaidam Basin of Qinghai Province are the first in China.Since the development of salt Lake resources for a long time,the main production of potash fertilizer in Qaidam Salt Lake area,in the production process of a certain amount of potash fertilizer production will increase several times of brucite by product,a large amount of brucite accumulation become "magnesium hazard".Therefore,magnesium oxide products can be widely used in metallurgy,food,aviation,medical and other fields by turning "magnesium pollution" into waste,which can not only promote the comprehensive utilization of magnesium resources in salt lake,but also bring great social and economic benefits while protecting the environment.This paper mainly studied the pyrolysis reactor of magnesium oxide prepared by one-step spray pyrolysis of magnesite from Qaidam Salt Lake area,and optimized the reactor structure.The "one-step" process refers to heating a saturated magnesium chloride hexahydrate solution directly to the pyrolysis temperature at which six water crystals can be removed.Compared with the traditional "two-step" method,"one-step" method has the advantages of simple process,less equipment required,high heating value of equipment,low production cost and operation cost.The basic height and diameter of the reactor were determined by calculating the parameters of the pyrolysis reaction,such as material change,gas consumption,reaction time and particle force.To establish the internal structure model of the pyrolysis reactor based on Euler-Lagrange theory for experimental analysis,and the verified mathematical model was used to adjust the structure type and structural parameters,and then the optimal pyrolysis reactor structure was obtained by orthogonal optimization method.The finite element model of pyrolysis reactor is established to check the key parts of the reactor,the lifting shaft of the furnace cover,so as to ensure the reliability of the pyrolysis reactor operation.The optimization of internal structure of pyrolysis reactor by CFD numerical simulation saves a lot of economic cost and time cost.The results show that the average temperature of the optimized reactor can reach 881.9K in the pyrolysis process,which is 17 percent higher than that of the initial structure.At the same time,it promotes the internal airflow circulation,greatly reduces the space for the formation of local low temperature,and reduces the temperature difference with the low temperature zone.While solving the problem of "magnesium pollution",it also reduces energy consumption,which is of certain significance to the national sustainable development strategy.