Coke formation during thermal reaction of tar from pyrolysis of a subbituminous coal
| Autor: | Renxing Wang, Qingya Liu, Zezhou Chen, Xiaojin Guo, Zhenyu Liu, Junfei Wu, Wenjing He, Lei Shi, Leiming Ji |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
business.industry
Chemistry 020209 energy General Chemical Engineering Radical Energy Engineering and Power Technology Tar Fraction (chemistry) 02 engineering and technology Coke Residence time (fluid dynamics) Fuel Technology 020401 chemical engineering Chemical engineering Yield (chemistry) 0202 electrical engineering electronic engineering information engineering Organic chemistry Coal 0204 chemical engineering business Pyrolysis |
| Zdroj: | Fuel Processing Technology. 155:68-73 |
| ISSN: | 0378-3820 |
| Popis: | The reaction of volatiles in a coal pyrolysis reactor determines the yield and quality of tar. This paper studies the yield, group composition and radical concentration of tars obtained from pyrolysis of a subbituminous coal, mainly on the effect of the tars' residence time in the pyrolysis reactor and in post-pyrolysis heating. The latter operation simulates the environment of tars, if they were in a large fast pyrolysis reactor. It is found that an increase in the volatiles' residence time in the pyrolysis reactor reduces the yield and increases the radical concentration of tars. The pitch fraction of the tars is mainly responsible for coke formation which occurs significantly at temperatures higher than 420 °C. The tars contain radicals, mainly in their coke and pitch fractions. The coke concentration in the tars increases with increasing heating time, linearly at 420 and 450 °C but in a sigmoidal pattern at higher temperatures. The coking behavior within 10 min can be expressed by the zero-order or zero-order + autocatalytic kinetics with activation energies of 128–138 kJ/mol. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect