Behaviors of coking and radicals during reaction of volatiles generated from fixed-bed pyrolysis of a lignite and a subbituminous coal

Zhou, Qiaoqiao; Liu, Qingya; Shi, Lei; Yan, Yuxin; Liu, Zhenyu

doi:10.1016/j.fuproc.2017.01.040

Cited by 59 publications

(21 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the examined parameters was the influence of the volatiles' residence time in the second stage on the gas yield. The observation was similar as in our results, namely that the gas yield was improved slightly from 1.5 to 4.2 seconds however, further residence time growing led to nearly constant gas yield 52 . The tendency in CH 4 and CO yield agrees with the results of Gao et al In detail, the CH 4 yield was increased and CO yield was decreased with residence time 53 …”

Section: Resultssupporting

confidence: 91%

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

et al. 2020

View full text Add to dashboard Cite

In this work, the co-pyrolysis of pine sawdust and low-density polyethylene (LDPE) was performed in a two-stage fixed-bed reactor to achieve hydrogenrich syngas and to investigate the effect of the parameters on gas yield and composition. Gas chromatography was used to confirm the content of the gas products. The pyrolysis was supported with Ni (in 5-25 wt%) loaded on activated carbon (AC). The maximum hydrogen concentration was 392.8 mmol g −1 sample, which was achieved by the use of the 10% Ni-AC catalyst. The influence of Ni loading on supporter was investigated by scanning electron microscope and transmission electron microscope techniques besides the thermogravity analysis. The increasing size of the Ni particles can be observed as a function of the Ni concentration on the catalyst. Carbon deposition was detected and the amorphous carbon seems more dominant than filamentous form. In addition, the effect of fluid residence time (water inlet and purge gas) on syngas yield was studied. Three different fluid residence times were investigated, and among them, the highest hydrogen yield was 392.8 mmol g −1 sample at 1.57 minutes residence time. Furthermore, the catalyst lifetime was studied using 10 wt% of Ni containing AC, and the average hydrogen concentration was 196.0 mmol g −1 sample over 15 cycles.

show abstract

Section: Resultssupporting

confidence: 91%

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The results show that the free radical concentration of a lower-grade coal does not obviously change after the coal is oxidized for a period of up to 6 months, but the free radical concentration of a higher-grade coal obviously increases. Zhou, 33 Yan, 34 and Liu 35 found that during the pyrogenation of coal, the increase in the concentration of free radicals and g -factor value and the decrease in the line width both indicate that coke experiences condensation with an increase in temperature, leading to the loss of oxygen and an increase in aromaticity. At present, the variation in free radicals caused by temperature mainly focuses on periods at different temperatures and lacks deep research on the variety of free radicals in experiments in which the temperature is raised and lowered.…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature Change on the Change Law of Free Radicals in Coal

et al. 2021

View full text Add to dashboard Cite

This study investigates changes in the concentration and types of free radicals in the process of coal heating, first rising and then falling. Hailar lignite, Panjiang bituminous coal, and Yangquan anthracite were selected as coal test samples. The results show that the lignite’s concentration of free radical changes during heating is greater than that of bituminous coal or anthracite. It clearly shows that lignite is more prone to spontaneous combustion. In the heating and cooling portion of the experiment, the concentration of free radicals during the cooling process was much more than that of free radicals at the same temperature during the heating process. These results obtained from this research study can provide a reference for the prevention and control of the spontaneous combustion of coal with changes in temperature. This study provides a theoretical basis for the prevention and control of spontaneous combustion of coal and the selection of retarding agents and methods in the process of flame retarding by testing the free radical changes of coal at different temperatures. Also, it provides a reference for preventing and controlling coal oxidation with the change in temperature, first rising and then falling.

show abstract

“…12 The high-viscosity pitch in tar is likely to condensate and mix with coke and dust in tar, leading to frequent clogging of volatile product lines and devices and affecting the long-term stable operation of the system. 13,14 Besides, the pitch in tar is also difficult to be treated, which against the subsequent tar upgrading. 15,16 To overcome these problems, the authors' previous study proposed a novel poly-generation process, which integrated low-rank coal pyrolysis and gasication with char gasication gas as heat carrier, 17 as is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen-rich gas from char gasification on rapid pyrolysis products of low rank coal in a downer pyrolyzer

Cheng

et al. 2021

RSC Adv.

View full text Add to dashboard Cite

show abstract

Behaviors of coking and radicals during reaction of volatiles generated from fixed-bed pyrolysis of a lignite and a subbituminous coal

Cited by 59 publications

References 26 publications

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

Influence of Temperature Change on the Change Law of Free Radicals in Coal

Effect of hydrogen-rich gas from char gasification on rapid pyrolysis products of low rank coal in a downer pyrolyzer

Contact Info

Product

Resources

About

Behaviors of coking and radicals during reaction of volatiles generated from fixed-bed pyrolysis of a lignite and a subbituminous coal

Cited by 59 publications

References 26 publications

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H 2 rich syngas

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H 2 rich syngas

Influence of Temperature Change on the Change Law of Free Radicals in Coal

Effect of hydrogen-rich gas from char gasification on rapid pyrolysis products of low rank coal in a downer pyrolyzer

Contact Info

Product

Resources

About

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas