Study On Performance Of Rotary Regenerative Thermal Oxidation Heat Recovery System

Volatile Organic Compounds(VOCs)in printing and packaging enterprises run through the whole production process,and rotary Regenerative Thermal Oxidizer(RTO)is the most efficient treatment method for VOCs at present.Due to the complex physical fields inside the equipment,the test is limited and the cost is high.this paper mainly studies the key components,that is Heat Transfer Media and rotary RTO in the rotary regenerative thermal oxidation heat recovery system.The main research contents are as follows:(1)This paper puts forward its own research content and technical route by summarizing the research on Heat Transfer Media and RTO in regenerative thermal oxidation heat recovery system at domestic and foreign in decades.Introduced the theoretical knowledge and calculation method of performance indicators for rotary regenerative thermal oxidation heat recovery system,identified the three-dimensional and various physical models for the study.(2)Numerical simulation of heat accumulator is fulfilled by utilizing the theoretical knowledge of fluid mechanics.Firstly,the three-dimensional model and grid division model of Heat Transfer Media are established.Then,the flow boundary conditions are determined.By analyzing the changes of different physical quantities in Heat Transfer Media under different meshing conditions,the meshing method of subsequent Heat Transfer Media research is determined.The feasibility of porous medium model was further confirmed by simulating various heights of Heat Transfer Media.Then,the porous was utilized to analyze the temperature changes of solid and gas in the wave and stable situations of Heat Transfer Media.Finally,the influence degree of Heat Transfer Media height,pore side length,pore wall thickness and inlet flow rate on the performance indicators of the Heat Transfer Media,such as outlet temperature,pressure loss and heat storage capacity,etc,is analyzed.And then the influence order was determined by mean square error analysis.(3)Numerical simulation of rotary RTO is carried out by utilizing the theory of the discipline of hydrodynamics,heat transfer and combustion.In the first place,a three-dimensional fluid model of RTO is established,afterward,divided the grid,the various boundary conditions in the combustion reaction are determined.By analyzing the changes of various physical quantities in rotary RTO under different grid division conditions.The grid division form of RTO is determined.By comparing and analyzing the physical quantities in the rotary RTO in a cycle with the experimental data,the feasibility of selecting each physical model is determined,and then the distribution of each physical quantity in the furnace in the start-up stage and the distribution of each physical quantity at different times in a cycle in the stable operation stage are studied.Finally,analyzed the influence of the parameters such as inlet air volume,exhaust gas concentration,commutation period and specification of Heat Transfer Media on the performance of the rotary RTO,including oxidation and outlet temperature,heat efficiency and oxidation rate,etc.Then the influence order was determined by mean square error analysis.(4)Using response surface analysis theory and the previous factor analysis experiments,the scope of each element has been determined.A BBD(Box Behnken Design)experimental design table was drawn,which has four parameters,each with three levels.And the regression equation between each factor and the performance of rotary RTO was fitted.Proved the accuracy of the regression equation.The interaction of each parameter on rotary RTO were analyzed in depth through analysis of variance tables and visualized coordinate maps,get the parameter combination when the performance of rotary RTO is the best.In this paper,fluid mechanics,heat transfer,combustion and other disciplines and numerical simulation theory.Simulated and studied the rotary regenerative thermal oxidation heat recovery system,and identified the elements that impact the performance of the Heat Transfer Media and rotary RTO,analyze the magnitude of the impact of the interaction between each factor on the performance of rotary RTO,and finally get the parameter combination when the performance of rotary RTO is the best.