Study On Pyrolysis And Combustion Process And Kinetics Of Enteromorpha Prolifera

The algae resources in the ocean have been widely concerned by scholars at home and abroad because of their high photosynthetic efficiency,rapid growth rate and huge resource reserves.Especially because of water pollution,eutrophication and other reasons,the outbreak of red tide and green tide is more and more frequent.Taking the green tide of Enteromorpha prolifera as an example,a huge amount of Enteromorpha are salvaged every year in the northern coastal cities of China.The treatment methods are mainly open-air stacking or landfill.How to effectively clean and utilize Enteromorpha resources is imminent.At present,there is no study on the combustion process of Enteromorpha prolifera and coal at home and abroad.In this paper,first of all,we select xutai and Datong anthracite and Datong bituminous coal as experimental materials,and use thermogravimetric analyzer to investigate their separate combustion and blending process,and carry out the dynamic analysis of the experimental data.The results show that the combustion process of coal and Enteromorpha prolifera can be divided into three stages:with the increase of the mass fraction of Enteromorpha prolifera,the activation energy of the main combustion stage increases,and the comprehensive combustion characteristic index decreases;when 25% Enteromorpha prolifera is blended with Datong anthracite,the synergistic effect of the two is obvious,the relative value can reach 35%;when 25%Enteromorpha prolifera is blended with Datong bituminous coal,the two are at 4 There is a certain inhibition at 80 ?,and the relative value can reach-11%.The kinetic analysis shows that two successive first-order reaction models can well describe the blending process,and there is a dynamic compensation effect between the activation energy and the pre exponential factor.As a solid carbon product,the physical and chemical properties of semi coke,an alternative product of coal,are close to that of high-quality anthracite.It is commonly used in small-scale boilers in rural areas to solve the environmental problems caused by the direct combustion of low-quality coal such as bituminous coal by coal retail consumers.In this paper,the combustion process of the mixture of Lancan and Enteromorpha is analyzedby thermogravimetry,and its dynamics is analyzed.The results show that the combustion process of Lancan and Enteromorpha prolifera can be divided into three stages.With the increase of the mass percentage of Enteromorpha prolifera,the ignition temperature decreases,the burnout temperature decreases,the combustion temperature range narrows,and the activation energy increases.In the second stage(200-650 ?),there is a significant synergistic effect,with a relative value of 35%.The dynamic analysis shows that two successive first stages are adopted The reaction model can well describe the blending process,and there is a dynamic compensation effect between activation energy and pre exponential factor.At present,there are few studies on the typical components of microalgae and plastics,and the reaction mechanism of the co pyrolysis of plastics and biomass is not clear.Based on this,the co pyrolysis process of PVC and PS,which are typical components of Enteromorpha prolifera and waste plastics,has been investigated,and the kinetic analysis has been carried out.The results show that the main pyrolysis temperature range moves towards the high temperature region and the pyrolysis speed increases with the increase of mass fraction of Enteromorpha;the main pyrolysis temperature range of PVC and Enteromorpha moves towards the low temperature region;the main pyrolysis temperature range of PS and Enteromorpha moves towards the high temperature region;PVC and Enteromorpha move towards the high temperature region When the mass fraction of PVC is 75%,the relative value can reach 34.5%;when the mass fraction of PS is 50%,the relative value can reach 28% %The kinetic analysis shows that the first-order kinetic model can well describe the co pyrolysis process of the two,and the two have dynamic compensation effect.