Study On Combustibility Of The Main Kinds Of Typical Tree Species In Yanbian Area Based On Thermogravimetric Analysis

This paper evaluates 26 kind of arbor species's Bark and leaves' Betula platyphylla,Robinia pseudoacacia,Tilia tuan,Pinus koraiensis,Larix olgensis,Quercus mongolica,Ulmus pumila,Betula costata,Phellodendron amurense,Alnus sibirica,Picea jezoensis,Chosenia arbutifolia,Populus ussuriensi,Ulmus laevis Pall.,Chosenia arbutifolia,Fraxinus rhynchophylla,Abies.fabri,Salix matsudana Koidz,Carpinus cordata,Acer palmatum,pyrus ussuriensis,Populus davidiana,Populus simonii,Picea asperata,Tilia amurensis,Taxus wallichiana,and the principal component analysis was carried out according to 13 thermal analysis parameters,and the following conclusions were drawn:? In this paper,the TG-DTG curves of the bark and leaves of 26 tree species were studied by thermo gravimetry at the rate of 20? min-1.It was found that the TG-DTG curves of the bark and leaves of 26 tree species experienced three main stages of pyrolysis,i.e.water loss stage,thermal decomposition stage of holocellulose and thermal decomposition stage of lignin,in which the thermal decomposition stage of holocellulose and thermal decomposition stage of lignin were combustibles The two most important stages of thermogravitation.?The range of activation energy of bark of 26 tree species is21.93kj·mol-1-48.02kj·mol-1;The range of activation energy of leaves of 26 tree species is 20.37kj·mol-1-50.23kj·mol-1.?The three-dimensional flammability evaluation of the bark of 26 tree species can be divided into four categories:the first category is moderate flammability,which is less intense,but lasts for a long time,including Betula platyphylla bark,Tilia tuan bark,Phellodendron amurense bark,Carpinus cordata bark,Acer palmatum bark,Populus davidiana bark,Picea jezoensis bark,Picea asperata bark and Larix olgensis bark;the second category is moderate low flammability,The combustion is not intense and lasts for a short time,including Robinia pseudoacacia bark,Ulmus laevis Pall.bark,Chosenia arbutifolia bark,Salix matsudana Koidz bark,Quercus mongolica bark and Taxus wallichiana bark;the third type is intense combustion,but lasts for a short time,including Populus ussuriensis bark,Ulmus pumila bark,Abies fabri bark,Fraxinus rhynchophylla bark,Alnus sibirica bark,Populus simonii bark,Chosenia arbutifolia bark and Tilia amurensis bark The fourth is the tree species with high combustion characteristics,only Pinus koraiensis bark.The three-dimensional flammability evaluation of 26 tree species can be divided into four categories:the first category is the moderate flammability,which is less intense,but lasts for a long time.It includes Populus ussuriensis leaves,Ulmus laevis Pall.leaves,Fraxinus rhynchophylla leaves,Ulmus pumila leaves,Alnus sibirica leaves,Quercus mongolica leaves,Acer palmatum leaves,Populus davidiana leaves,Picea asperata leaves,Larix olgensis leaves,Tilia amurensis leaves and Taxus wallichiana leaves;the second type is moderately low ignitability,less intense combustion,short duration.It includes Robinia pseudoacacia leaves,Phellodendron amurense leaves and Picea jezoensis leaves;the third type is more intense combustion,but short duration.It includes Betula platyphylla leaves,Tilia tuan leaves,Betula costata leaves,Chosenia arbutifolia leaves,Abies fabri leaves,Salix matsudana Koidz leaves,Carpinus cordata leaves,pyrus ussuriensis leaves and Populus simonii leaves The fourth is the tree species with high combustion characteristics.It includes Pinus koraiensis leaves and Chosenia arbutifolia leaves.? According to the principal component analysis of the bark of 26 tree species,the order of flammability from large to small is Pinus koraiensis>Picea jezoensis>A bies fabri>Ulmus pumila>Tilia amurensis>Picea asperata>Fraxinus rhynchophylla>Betula costata>Tilia tuan>Populus simonii>Phellodendron amurense>pyrus ussuriensis>Larix olgensis>Chosenia arbutifolia>Carpinus cordata>Taxus wallichiana>Acer palmatum>Ouercus mongolica>Populus davidiana>A lnus sibirica>Populus ussuriensis>Chosenia arbutifolia>Salix matsudana Koidz>Robinia pseudoacacia>Ulmus laevis Pall.>Betula platyphylla.According to the principal component analysis of the leaves of 26 tree species,the order of flammability from large to small is Carpinus cordata>Betula platyphylla>Abies fabri>Betula cost at a>Ulmus pumila>Ulmus laevis Pall>Ulmus laevis Pall.>Pinus koraiensis>Tilia tuan>Populus davidiana>Phellodendron amurense>Salix matsudana Koidz>Populus simonii>Acer palmatum>Fraxinus rhynchophylla>Alnus sibirica>Chosenia arbutifolia>Chosenia arbutifolia>pyrus ussuriensis>Tilia amurensis>Larix olgensis>Picea asperata>Populus ussuriensis>Robinia pseudoacacia>Taxus wallichiana>Quercus mongolica.