Structure Design And Numerical Simulation Of Torch Burner

During the daily operation,opening and parking,especially in the event of an accident,post-derivatives and petrochemicals such as plastics,chemicals and oil refining devices will emit toxic and harmful flare gas.In order to ensure the normal performance and production of the device and its surroundings,it is necessary to send the torch gas to the torch for combustion treatment.The torch burner is the most critical equipment in the flare discharge system.Its performance directly affects the performance of the flare discharge system and whether it can meet environmental requirements.The research on the torch burner in this thesis was introduced as follows:1)Firstly the current problems of the burner and the research progress of the burner at home and abroad were introduced in this paper,and then the classification of the gas burner according to the different classification methods of the burner was separately introduced.Finally,the characteristics of various burners were introduced.2)The design requirements of the flare burner were first proposed according to the complete combustion of the flare burner,good flame stability,safety and environmental pollution-free.The scheme of the burner design was proposed by the design requirements of the flare burner.Finally,by consulting relevant data,the initial dimensions of the flare burner premixing chamber were designed as the premixing chamber diameter of 218mm,the premixing chamber length of 400mm.The initial size of the gas nozzle is the gas nozzle diameter of 59mm and the gas nozzle length of 200mm.The steam nozzle is as follows:a single central steam nozzle is replaced by 10 smaller diameter steam nozzles evenly distributed around the axis of the premixing chamber,wherein each smaller water vapor nozzle has a diameter of 10 mm and the water vapor mass flow rate of each of the smaller steam nozzles is 0.01175 kg/s.3)Since the initial size of the flare burner is only some empirical value,there may be errors,the FLUENT simulation was required.In this paper,after determing the physical model,the turbulence K-co model,the component transport and the chemical reaction model of the general finite velocity models were established.Then after the meshing boundary type setting,the FLUENT calculation was carried out.The simulation results are:(1)Determine the qualified size of the gas nozzle and the premixing chamber.The size of the gas nozzle is the diameter d=59mm,the length 1=200mm,and the size of the premixing chamber is the diameter D=218mm,the length L=400mm.(2)When the gas nozzle extends 20mm into the premixing chamber,the mixing effect of the flare gas and the air in the premixing chamber is the best,and the burner has the best working performance.(3)The distance between the axis of the steam nozzle and the axis of the premixing chamber is f=80 mm.4)Firstly the structure of the flare burner,the existing burner 1,the existing burner 2 and the existing burner 3 were compared.The structure difference of the flare burner,the existing burner 1,the existing burner 2 and the existing 3 were analyzed.Then the velocity distributions,temperature distributions and propylene mass fraction distributions of the flare burner,the existing burner 1,the existing burner 2 and the existing burner 3 were respectively compared.The similarities,differences and the corresponding causes of the various types distributions of the four burners were analyzed.Finally,by analyzing four kinds of burners,it was found that the flare burner generates the least amount of NOx when burning flare gas.And it can effectively eliminate the black smoke generated when the flare gas is burned.5)The velocity distributions,temperature distributions and propylene mass fraction distributions of the flare burner under different inlet pressures of different flare gas nozzles were compared respectively.The similarities and differences of various distributions were obtained.Then the corresponding reasons were analyzed.It was shown that the newly designed torch burner generates less NOx and effectively eliminate the black smoke generated when the torch gas was burnt.The torch burner has little environmental pollution and meets the requirements of environmental protection.And as the torch gas nozzle inlet pressure of the torch burner gradually increases,the speed of the mixed gas at the exit of the premixing chamber of the torch burner gradually increases;the maximum temperature generated by the torch burner increases when the torch gas was burnt,and the highest temperature region in the temperature distributions of the torch burner also increases;the distribution of propylene mass fraction along the central axis gradually becomes longer.The research results in this article provide a certain theoretical basis for the design of torch burner.