| The soot particles produced by incomplete combustion of fossil energy are discharged in large quantities,and the harm to the environment and human health has attracted global attention.In recent years,the state has launched a large number of control policies in the direction of pollutant emission reduction.In response to the national policy,soot generation needs to be studied,in order to achieve the purpose of clean,energy-saving and efficient combustion.Based on the research status of soot emission reduction at home and abroad,the extinction method is used to independently build an experimental platform to measure the distribution of soot particles in acetylene flame.The coflame simulation software is used to simulate the experimental conditions,find the best method to inhibit the formation of soot from the soot forming mechanism,and compare the pre experiment and coflame simulation results of the experimental platform with the literature data of other researchers.The results show that the distribution of soot in the flame is basically the same,only the soot particles have a slight difference in the peak value,which verifies the accuracy of the extinction experimental platform and numerical simulation.The experimental platform and coflame simulation software are used to carry out the experiment and simulation of O2-CO2 adding H2.At the same time,in order to prove that there is a small coupling between CO2 and H2,coflame simulation software is used to simulate the O2-N2 atmosphere under the same working condition.The conclusions are as follows:the experimental and simulation data show that under the two atmospheres,the flame height is basically unchanged and the flame temperature rises slightly with the increase of H2 flow ratio;the simulation data show that when the flow ratio of H2 increases from 0.1 to 0.5,the peak value of soot volume fraction increases from 27.91×10-6 in O2-N2 atmosphere down to 22.57×10-6,with a decrease of 19.13%.Under O2-CO2 atmosphere,the peak value of soot volume fraction increases from 16.41×10-6 down to 12.76×10-6,with a decrease of 22.24%.The reason for the different decrease is that there will be a small coupling between H2 and CO2,which can better inhibit the formation of soot;from the changes of different components in the flame,it is found that with the addition of H2,the mole fraction of C6H6 in the acetylene flame decreases,and when the H2 flow ratio is greater than 0.2,the mole fraction of A4 decreases,reducing the formation of carbon nuclei;the increase of OH-mole fraction in acetylene flame,but the slight decrease of oxidation rate,is not the reason to inhibit the formation of soot;the surface growth rate of soot particles is inhibited and the number of mature soot particles is reduced,which is the main reason why H2 inhibits soot formation. |
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