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烟杆热解多联产是烟杆高值化利用的重要选择之一。文中主要研究了烟杆热解转化过程中气液固产物的形成析出机制以及联产机制。研究发现随着热解温度的升高,气体产率直线增加,固体焦逐渐减少,液体油产率则在20%左右变化不大。在低温下,热解气主要为CO2和CO,随着温度的升高,CO、H2和CH4的量逐渐增大,且在700℃时CO高达35.65%,热解气热值也升高到12.53 MJ/m3,是较理想的气体燃料。液体油的组成较为复杂,其中吡啶类、酯类和一些酸类大分子有机物含量在低温下较高,而在高温下由于二次反应而使其含量降低,苯酚类和芳环类有机物均在高温下含量较高。随着温度的上升,焦炭中的有机官能团逐渐减少,在600℃后,烟杆基本热解完全。
Tobacco stem pyrolysis polygeneration is one of the most important choices for tobacco stem high value utilization. In this paper, the formation mechanism of gas-liquid solid products and the co-production mechanism were mainly studied during the pyrolysis and transformation of tobacco stems. The results show that as the pyrolysis temperature increases, the gas yield increases linearly and the solid coke decreases gradually, while the liquid oil yield does not change much at about 20%. At low temperatures, the pyrolysis gases are mainly CO 2 and CO. As the temperature increases, the amounts of CO, H 2 and CH 4 gradually increase, and the CO reaches as high as 35.65% at 700 ° C. The pyrolysis gas calorific value also increases to 12.53 MJ / m3, is the ideal gas fuel. The composition of liquid oil is more complex, in which the contents of organic compounds such as pyridine, esters and some acid macromolecules are higher at low temperature and lower at high temperature due to the second reaction. Phenol and aromatic ring organic compounds are all in the High temperature content. With the increase of temperature, the organic functional groups in coke decreased gradually. After 600 ℃, the basic pyrolysis of tobacco stem was complete.