Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas

Chen, Zhaohui; Li, Yunjia; Lai, Dengguo; Geng, Sulong; Zhou, Qi; Gao, Shiqiu; Xu, Guangwen

doi:10.1016/j.apenergy.2018.02.023

Cited by 71 publications

(11 citation statements)

References 32 publications

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“…[3] Firstly, it can be produced from carbon-based materials by means of gasification and pyrolysis. [4][5][6][7] Secondly, the main processes in oil and petrochemical industry that produce syngas from the raw materials (natural gas, heavy oil, coal, biomass, and others) are steam reforming, dry reforming, co-gasification, and partial oxidation. [8][9][10][11][12][13] Other potential syngas producers are by the conversion of greenhouse gases (i. e., CO 2 and methane) to syngas via the dry reforming technology.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

Al-Qadri

Nasser

Galadima³

et al. 2022

ChemistrySelect

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Recently, Liquified petroleum gas (LPG) attracts wide applications due to its high heating value and clean combustibility. An innovative approach to synthesis of LPG from syngas was established based on Fisher-Tropsch (F-T) technology. However, the conversion and selectivity are generally low with the classical catalysts. The hybrid system of methanol and zeolitebased catalyst was established as a potential approach to promote such a process. To strongly overcome the large demand of LPG and grasp the research work in this subject, a comprehensive review became necessary. LPG is basically produced from syngas through the direct method, where most recent studies lay on, and the indirect or semi direct approach. There were several factors affecting the process performance, which mainly are the reaction temperature, reaction pressure, type of the hybrid catalyst, carbon monoxide to hydrogen ratio, mixture flow rate, and time-on-stream of the reaction. The most common reaction conditions reported in the literature are 260-400 °C, 10-50 bars and H 2 to CO ratio of 2. However, the most important parameter considered was the catalyst, which is a key factor of interest. The two main issues controlling the catalyst performance were the synergetic effect between the two hybridized catalysts and the used type of zeolite. It was perceived that the higher the zeolite membered rings the better the LPG selectivity (i. e., BEA, and USY provided the higher LPG production rate).

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Section: Introductionmentioning

confidence: 99%

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

Al-Qadri

Nasser

Galadima³

et al. 2022

ChemistrySelect

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“…Twin fluidized bed has been claimed to be capable of producing syngas with low tar and high hydrogen content [6,7]. Twin fluidized bed with steam as gasifying agent produces H2/CO ratio >1 and H2 concentration more than 50%.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Modified Zeolite as Catalyst for Steam Gasification of Palm Kernel Shell

Waluyo

Ruya

Hantoko

et al. 2021

Bull. Chem. React. Eng. Catal.

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Syngas from biomass gasification is being developed for alternative feedstock in the chemical industry. Palm kernel shell which is generated from palm oil industry can be potentially used as raw material for gasification process. The purpose of this study was to investigate the use of modified natural zeolite catalysts in steam gasification of palm kernel shells. Mordenite type zeolite was modified by acid leaching to be used as a tar cracking catalyst. Steam gasification was conducted at the temperature range of 750–850 °C and the steam to biomass ratio was in the range of 0–2.25. The result showed that steam gasification of palm kernel shell with the addition of zeolite catalyst at 750 °C and steam to biomass ratio 2.25 could reduce tar content up to 98% or became 0.7 g/Nm3. In this study, gasification of palm kernel shells produced syngas with the hydrogen concentration in the range of 52–64% and H2/CO ratio of 2.7–5.7. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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“…Recently, pulverized coal has been widely used in steel and power plants for improving the burnout of coal, although this technology suffers from separation, crushing, grinding from the raw coal, and pipe blockage issues during the transportation of the pulverized coal [3][4][5][6][7]. Moreover, the need for reduced greenhouse gas emissions has spurred the development of clean coal technology, such as chemical looping combustion (CLC) [8], integrated gasification combined cycle (IGCC) [9], multi-stage coal gasification (MSCG) [10], and so on. These innovative technologies based on the pyrolysis and gasification of coal have been applied in the manufacturing industry.…”

Section: Introductionmentioning

confidence: 99%

An Improved Comprehensive Model of Pyrolysis of Large Coal Particles to Predict Temperature Variation and Volatile Component Yields

Zhou

Huo

et al. 2019

Energies

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In this work, an improved comprehensive model was developed for large coal particles to predict temperature variation and volatile component yields. The kinetics model of volatile component yields, where the volatile matters were assumed to comprise nine species, was combined with heat transfer model. The interaction between volatile yield and heat transfer during pyrolysis of large Maltby coal particles was investigated. An apparent temperature difference has been observed between the surface and core of particles at the initial heating stage. The non-uniform temperature distribution inside coal particles causes non-simultaneous volatile yields release from the surface and core area. The volatile release occurs after the coal temperature rises higher than 350 °C, and its yield steeply increases within the temperature range of 450–520 °C. The peak of volatile release rate corresponds to about 485 °C due to the rapid release of tar and H2O. The tar is almost completely released at around 550 °C. With the increasing particle size, the difference in temperature and volatile yield between the surface and core increases at the end of heating. The results are expected to provide insights into the interaction between heat transfer and volatile yields during pyrolysis of large coal particles.

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Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas

Cited by 71 publications

References 32 publications

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

A Review on the Conversion of Synthetic Gas to LPG over Hybrid Nanostructure Zeolites Catalysts

Utilization of Modified Zeolite as Catalyst for Steam Gasification of Palm Kernel Shell

An Improved Comprehensive Model of Pyrolysis of Large Coal Particles to Predict Temperature Variation and Volatile Component Yields

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