Pyrolysis of low-rank coal with heat-carrying particles in a downer reactor
Pyrolysis of low-rank coal with heat-carrying particles in a downer reactor
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DOI：
10.1016/j.fuproc.2017.06.029
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发表时间：
2017-12-01
影响因子：
7.5
通讯作者：
Matsuoka, Koichi
中科院分区：
文献类型：
--
作者：
Fushimi, Chihiro;Okuyama, Shuhei;Matsuoka, Koichi
开发了一种新型并流下行床热解器，该热解器可将流化床中预热的载热颗粒（硅砂，粒径d（p，sand）= 0.116 mm）与煤从反应器顶部分开进料。这允许高温颗粒直接接触煤颗粒。在石英玻璃下行床反应器（长1.0 m，内径20 mm）中，于1173 K，在无水蒸汽和有水蒸汽（最高30 vol%）存在下，研究了预热的载热颗粒对干燥的洛阳煤颗粒（粒径d（p，煤）= 0.350-0.500 mm）热解的影响。石英砂进料速率的增加增加了碳表面沉积物的量和CO2和CO的产率。所产生的重焦油和沉积在石英砂上的碳的TOF-MS和FT-IR光谱表明，重焦油非常迅速地沉积在石英砂表面并通过聚合形成焦炭。在煤颗粒在该热解器中的停留时间（0.54-0.61 s）内，水蒸气对热解反应没有明显影响。(C)2017爱思唯尔B. V.保留所有权利。
A novel co-current downer pyrolyzer was developed that can feed heat-carrying particles (silica sand, particle size, d(p,sand) = 0.116 mm) preheated in a fluidized bed separately with coal from the top of the reactor. This allows the high-temperature particles to directly contact coal particles. The influence of the pre-heated heat-carrying particles on the pyrolysis of dried Loy Yang coal particles (particle size, d(p,coal) = 0.350-0.500 mm) in a quartz glass downer reactor (1.0 m in length and 20 mm in inner diameter) was investigated at 1173 K in the absence and presence of the steam (up to 30 vol%) under different silica/coal ratios. Increase in sand feed rate increased the amount of carbon surface deposits and the yields of CO2 and CO. TOF-MS and FT-IR spectra of the produced heavy tar and deposited carbon on silica sand indicated that the heavy tar very rapidly deposited on the surfaces of sand and forms cokes by polymerization. No significant influence of the steam on pyrolysis reaction was observed within the estimated residence time of coal particles (similar to 0.54-0.61 s) in this pyrolyzer. (C) 2017 Elsevier B.V. All rights reserved.