The reaction characteristics of hydrocarbon fuel in different length pipe under subcritical pressure were studied.Suitable reaction temperature and channel length were determined based on pyrolysis products,gas yield,heat sink and coking,etc.The results indicated that the influence of pipe length on reaction characteristics of hydrocarbon fuel were remarkable.When the pipe length was less than 8 m,the gas yield and heat sink between 550~750 could ℃be improved greatly with the increase of pipe length.When py...