Loess Temple And Jinjie Raw Coal And Its Swelling Coal Pyrolysis

Pyrolysis of coal could gain a lot of valuable production, in which the gas production can be treated as high heat value coal gas, the solid char can be further used as burning material or to generate electricity and the liquid production contains a lot of aromatic hydrocarbons which have high value in use. In this contribution catalytic pyrolysis and hydropyrolysis of Huang Tumiao raw coal,Huang Tumiao and Jinjie solvent-swollen raw coal are investigated using TG analysis and fix-bed reactor in cooperated with on-line chromatogram, The mainly results are listed as following:1. The BTX in liquid production of pyrolysis coal appear at about 250℃, the BTX yield ratio improves with the increasing of temperature and reaches its maximal value at about 450℃-500℃, and fall to minimal value at about 700℃. Hydropyrolysis could notable increases the conversion and the production yield ratio remarkably.2. With the increasing of final pyrolysis temperature the char yield ratio reduces gradually, on the contrary the gas yield ratio increases with that, the max value of tar yield ratio is about 650℃.3. Except ZnCl₂ all of used catalysts promote the final conversion of pyrolysis. Hydropyrolysis can largely increase gas and solid yield, especially aromatic hydrocarbons yield ratio is improved dramatically.4. To investigate the swelling effect of HTM and JJ raw coal various experiments are carried out using the selected solvents and its mixture. As far as swelling effect of single solvent is considered, the NMP shows the best effect while THF is the worst case. As expected NMP and pyridine present the best performance among the mixture of the selected solvent.5. Weightlessness of swelling coal is investigated with the help of TG, compare with the original one the total conversion ratio of swelling coal is improved, whereas the swelled coal using NMP shows the best result and the swelled coal using THF is worst one, In addition it is found there exists a functional relationship between swelling ratio and total conversion ratio of swelling coal. In the mixture solvent of NMP and pyridine the swelling coal provides the best conversion effect and the yield ratio of pyrolysis production is also remarkable improved, among those the improvement of BTX yield ratio is most significant.6. Pyrolysis of HTM raw coal and swelling coal of HTM and JJ are investigated in the range of overall reactive temperature, activation energy in the main reaction phase is individual calculated, Compare with raw coal the activate energy of pyrolysis in devolatilization phase of the coal with catalyst is lower than that of raw coal, this indicates that the catalyst has significant promotion effect in this phase. At lower temperature there exists devolatilization reaction in swelling coal, and it exists a relationship between the swelling ratio and the activation energy, the higher the swelling ratio the smaller activation energy. In addition more investigation is carried out to the preexponential correlation factor k₀ and activation energy E, as a result good compensative relationship is found.