Insight into reaction performance and product formation in a novel coal pyrolyzer of pilot-scale test

作     者：Qian, Yanan An, Ping Jia, Xin Han, Zhennan Wu, Rongcheng Liu, Xiaoxing Xu, Guangwen 

作者机构：SINOPEC Res Inst Safety Engn Co Ltd State Key Lab Chem Safety Qingdao 266071 Peoples R China Shenyang Univ Chem Technol Key Lab Resources Chem & Mat Minist Educ China Shenyang 110142 Peoples R China Inst Proc Engn State Key Lab Multiphase Complex Syst Beijing 100190 Peoples R China 

出 版 物：《JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS》 (分析与应用高温分解杂志)

年 卷 期：2024年第179卷

核心收录：

学科分类：0820[工学-石油与天然气工程] 081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China [U1908201  22208225] 

主　　题：Coal pyrolysis CFD Moving bed Internals Heat transfer Tar cracking 

摘      要：The pyrolysis behavior of coal in a pilot-scale moving bed with internals is modeled through computational fluid dynamics (CFD) simulations. The temperature field, reaction field, volatile flow paths inside the reactor, and effects of the internal design and operating parameters on the tar yield are systematically investigated. The simulation results show that the central gas channel allows the majority of generated volatiles to laterally pass through the low-temperature bed layer. This not only enhanced the primary volatile generation reaction but also significantly reduced the secondary cracking of tar. However, the placement of the heat transfer plates had a dual effect. While the plates significantly enhanced heat transfer, thereby promoting primary reactions, they could cause the volatiles to bend towards the high-temperature zone near the plates, resulting in the partial loss of tar. The tar yield may decrease with an increase in the number or area of heat transfer plates. Furthermore, investigations into the operational parameters revealed that increasing the furnace temperature appropriately and reducing the mass flux of coal were favorable for the heat transfer and yield increase in tar.