The Study On Key Factors Of Regenerative Rotary Thermal Oxidizer Furnace

During the“Thirteenth Five-Year Plan”period,Volatile Organic Compounds（VOCs）and O₃ began to receive widespread attention,and the“14th Five-Year Plan”VOCs and O₃ will be the key air pollutants to be treated.VOCs pollute the environment and endanger human health.At the same time,they are also important precursors of O₃.Therefore,reducing VOCs emissions is an effective measure to improve the atmospheric environment.The incineration technology in the VOCs treatment technology has the highest removal efficiency,and the thermal storage combustion in the incineration technology has higher thermal efficiency than thermal combustion.The core equipment of regenerative combustion technology has been developed to the third-generation Rotary Regenerative Oxidation Technology R-RTO,and has gradually replaced two-chamber RTO（Regenerative Oxidation Technology）and three-chamber RTO in recent years.There are few researches on R-RTO at home and abroad,so it is necessary to use experiments and numerical calculations to study R-RTO.In the experiment,the air volume of the R-RTO measured is 10000Nm³/h,the VOCs concentration is 2600mg/m³,the switching time is 20s,and the heat storage body height is 1.20m.Measure the R-RTO oxidation chamber,regenerator’s temperature,inlet and outlet under experimental conditions.In the experiment,the temperature of the oxidation chamber and the regenerator fluctuates according to a certain rule,while the inlet and outlet temperatures are stable.Using dynamic grid technology and UDF（User-Defined Function）to simulate the switching time rotation of the rotary valve basin during R-RTO operation.After 1.5 cycles,the average error between the numerical calculation temperature value and the experimental temperature value is less than 5%,which proves the feasibility and accuracy of using grid motion technology to solve the rotation of the rotary valve switching time.Using this model to analyze the speed and temperature field of R-RTO,it is found that the exhaust gas with complex velocity distribution enters the oxidation chamber at a uniform speed under the action of the regenerator flow;the regenerator has a large temperature gradient in the flow direction of the flue gas,below the regenerator The temperature in the basin is uniform.Then,a simple comparison method is used to study the changes of the oxidation chamber temperature,the regenerator temperature,the average outlet temperature and the heat recovery efficiency of the R-RTO under different operating parameters and regenerator heights over time.The results show that the higher the inlet air volume and the concentration of VCOs,the greater the temperature fluctuations at the measuring points of the regenerator and the oxidation chamber,and the inlet air volume is directly proportional to the thermal efficiency of the R-RTO.The higher the height of the regenerator,the higher the temperature of the oxidation chamber and the greater the fluctuation.When the height of the regenerator is 1.0m,the average temperature of the R-RTO outlet is higher,and the thermal efficiency is only 93%.Finally,the standard orthogonal table L16（4⁵）is used to design a four-factor four-level orthogonal experiment,and two analysis methods of range and variance are used to study the comprehensive influence of the four factors on the oxidation chamber temperature,outlet temperature and heat recovery efficiency.The data shows that the height of the R-RTO structural parameter heat storage body has a significant effect on the oxidation chamber temperature and heat recovery efficiency,and the R-RTO operating parameter rotation switching time and VOCs concentration have a significant effect on the oxidation chamber temperature.