Study On The Utilization Of Mine Exhaust Gases

In this subject,the numerical simulation of the utilization of mine exhaust gases is studied,thus putting to use orientation and reversal operational processes. The study is based on the the analysis and solutions of the one-dimensional steady state and dynamic mathematical model of catalytic reversal flow reactor (CRFR) and learning from the related literatures about the advantages of the processes, the three kinds of technology processes is proposed, which are heat recovery processes, steady state recovery heat process, steady state heat taking from the tail process, heat taking from the tail of CRFR process respectively. The proposal of three technology processes provides the important design ideas for improving the operation conditions for self-heating combustion.The one-dimensional steady state mathematical model of fixed-bed reactor is established, which is used for simulation the self-heating combustion of mine exhaust gases. The operation parameters(the apparent flow rate of gas, the methane volume fraction of inlet gas, the regenerature area, the heat exchanger area, the length of reactor etc.) affect the axial gas temperature and concentration distribution. One-dimensional dynamic mathematical model of CRFR is adopted to determine the axial gas temperature and concentration distribution under different operation conditions(the reverse periods, the apparent flow rate of gas, the methane volume fraction of inlet gas, the length of reactor, the initial temperature of solid bed etc.). The one and two operation factors of the available operating region of fixed-bed reactor(the temperature run-away of solid bed reactor is the state when the average temperature of solid bed is over 1300K; the extinction is the state when the methane conversion rate is low than 99%) are researched, providing the basis for industry practical production.In addition, the energy analysis of the two steady state processes are studied under different operating conditions, mainly on the energy loss rate and utilization rate, comparing and analyzing the energy under different processes and operating conditions.