| Rubber wood has a huge output in Hainan of china,and has good prospects for resource utilization..However,the gas products of pyrolysis of rubber wood contain carcinogens such as phenol and benzaldehyde,which will cause great harm to human health.Therefore,in-depth study of the pyrolysis of rubber wood and its gas products is of guiding significance for the study of the release characteristics of the gas products of rubber wood and the control of the formation of carcinogens.Using elemental analyzers and industrial analyzers to analyze the physical and chemical properties of rubber wood,the results show that industrial analysis shows that the content of volatile matter in rubber wood is higher at 82.54%and the ash content is 1.45%.Elemental analysis shows that the content of N and S is traceThe thermogravimetric test was carried out using rubber wood as raw material,and the influence of six additives(Nacl,KCl,CuCl,CaCl2,FeCl2,TiO2)was investigated.The above promotes the pyrolysis of biomass samples.Among them,TiO2 has the greatest similarity to the thermal weightlessness curve without additives,and the residual amount of coke is closest to that without additives.The pyrolysis time of the residual carbon decomposition stage is prolonged.The pyrolysis characteristics of NaCl and KCl to rubber wood are similar.The addition of these two additives significantly prolongs the pyrolysis time of the residual carbon decomposition stage,promotes the thermal decomposition of the samples in the residual carbon decomposition stage,and reduces the coke yield.CaCl2,FeCl2,and CuCl have similarity to the pyrolysis characteristics of rubber wood.They significantly increase the weight loss rate during the drying and preheating stage.Among them,the maximum weight loss rate corresponding to CuCl is the largest,and the maximum weight loss rates corresponding to the other five additives are less than those When the additive is added,and the main volatility corresponding to CuCl is analyzed,the temperature range is the smallest,indicating that the pyrolysis process of rubber wood with CuCl as the additive is the strongest release of volatiles in the second stage.CaCl2 and CuCl significantly reduced the difficulty of precipitation of volatiles as a whole,while the remaining four additives increased the difficulty of precipitation of volatiles.Therefore,the most beneficial to the pyrolysis process of rubber wood is CuCl additiveThe py-gc-ms test was carried out using rubber wood as the raw material,and it was found that phenols,furans,ketones,acids,aldehydes,other substances,etc.were released during the pyrolysis of rubber wood.With the increase of pyrolysis temperature,rubber wood is dominated by phenols,furans and ketones at 400℃,and the contents are phenols,furans,aldehydes and other compounds from high to low.When the pyrolysis temperature is 600℃,the highest yields are phenols and aldehydes.At the pyrolysis temperature of 800℃,the phenol content is the highestExcept for TiO2,the addition of other additives all play a role in promoting.As the pyrolysis temperature increases,the overall gas production becomes larger at a temperature of 200 ℃-400 ℃,and the carcinogens phenol,naphthalene,benzaldehyde,toluene,styrene,and furan gradually increase,reaching a temperature of about 400 ℃.highest.Continue to heat up to 800℃,the content of the six carcinogens phenol,naphthalene,benzaldehyde,toluene,styrene,furan decreased and tended to be stable. |
