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Structural characterization of char during co-gasification from torrefied sludge and Yangchangwan bituminous coal

International Journal of coal Science & Technology 2023年第5期10卷 12-20页

作者： Xinsha Zhang Yonghui Bai Jie Qin Shengli Shi Jiazhong Liu Shuaibing Wang Minhui Zhao Guiming Shi Changbing Ye Guangsuo Yu Yuxi Normal University YuxiYunnan653100China State Key Laboratory of High-efficiency Utilization of coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan750021China Institute of Clean coal Technology East China University of Science and TechnologyShanghai200237China

The present study aims to investigate the physico-chemical structural evolution characteristics of char structure of co_(2) atmosphere torrefaction pretreated sludge with Yangchangwan bituminous coal(YC)during co-gasification.The co-gasification reactivity of torrefied sludge and YC was measured using a thermogravimetric analyzer.The co-gasification reactivity of torrefied sludge with YC was thoroughly explored in depth by in situ heating stage microscope coupled with traditional characterization means of char sample(Scanning electron microscope,nitrogen adsorption analyzer,laser Raman spectroscopy).The results show that the gasification reaction rate of sludge treated under co_(2) atmosphere and coal blended char was better than other char samples at 1100–1200℃.The torrefied sludge under co_(2) atmosphere promoted its thermal decomposition to the maximum extent,so that it eventually was transformed into a large number of small broken particles.The specific surface area and ID1/IG ratio of blended char of torrefied sludge under co_(2) atmosphere and YC were 1.70 and 1.07 times higher than that of YC,respectively.The in situ technique revealed that YC char with the addition of torrefied sludge undergo gasification by shrinking core modes and the presence of obvious ash melting flow phenomenon.It was more obvious than that of YC.

关键词： Characteristic-Char structure Torrefaction co-gasification

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Crystallization and viscosity-temperature characteristics during co-gasification of industrial sludge and coal

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Frontiers in Energy 2022年第6期16卷 1037-1047页

作者： Linmin ZHANG Bin LIU Juntao WEI Xudong SONG Yonghui BAI Jiaofei WANG Ying ZHOU Huijun YANG Guangsuo YU State Key Laboratory of High-efficiency Utilization of coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Joint International Research Laboratory of Biomass Energy and Materials Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of coal Chemical Industry Technology Ningxia Coal Industry Co.Ltd.Yinchuan 750000China Institute of Clean coal Technology East China University of Science and TechnologyShanghai 200237China

co-gasification of industrial sludge(IS)and coal was an effective approach to achieve harmless and sustainable utilization of IS.The long-term and stable operation of a co-gasification largely depends on fluidity of coal-ash slag.Herein,the effects of IS addition on the crystallization and viscosity of Shuangmazao(SMZ)coal were investigated by means of high temperature stage coupled with an optical microscope(HTSOM),a scanning electron microscopy coupled with an energy dispersive Xray spectrometry(SEM-EDS),X-ray diffraction(XRD),a Fourier transform infrared spectrometer(FTIR),and FactSage software.The results showed that when the proportion of IS was less than 60%,with the addition of IS,the slag existed in an amorphous form.This was due to the high content of SiO_(2) and Al_(2)O_(3) in SMZ ash and blended ash,which had a high glass-forming ability(GFA).The slag formed at a high temperature had a higher polymerization degree and viscosity,which led to a decrease in the migration ability between ions,and ultimately made the slag difficult to crystallize during the cooling.When the proportion of IS was higher than 60%,the addition of IS increased the CaO and FeO content in the system.As network modifiers,CaO and FeO could provide O^(2−)at a high temperature,which reacted with silicate network structure and continuously destroyed the complexity of network structure,thus reducing the polymerization degree and viscosity of slag.At this time,the migration ability between ions was enhanced,and needle-shaped/rod-shaped crystals were precipitated during the cooling process.Finally,the viscosity calculated by simulation and Einstein-Roscoe empirical formula demonstrated that the addition of IS could significantly improve the fluidity of coal ash and meet the requirements of the liquid slag-tapping gasifier.The purpose of this work was to provide theoretical support for slag flow mechanisms during the gasifier slagging-tapping process and the resource treatment of industrial solid waste.

关键词： co-gasification industrial sludge crystallization viscosity mineral matter evolution

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Effect of Blending Ratio on the Sodium Release Behaviors,Ash Slagging Characteristics and Char gasification Performances during co-gasification of Zhundong coal with Wuhai coal

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Journal of Thermal Science 2023年第1期32卷 448-456页

作者： GUO Shuai WANG Xiaofang Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

Some ash related problems,such as slagging at furnace bottom and fouling at the air pre-heater surface,are frequently encountered during circulating fluidized bed gasification(CFBG)of Zhundong coal.Low ash fusion temperatures(AFTs)and intense sodium release should be responsible for those problems.In industry,coal blending is deemed to be a feasible method to both improve AFTs and control sodium release.In this work,Wuhai coal was selected as blending coal.The ratio is varied from 0%to 40%by mass with 10%interval.The mixed samples were gasified by steam at 950°C in a lab-scale furnace.Some key indices,such as sodium release behaviors,ash slagging characteristics and char gasification performances,were investigated by ICP-OES,AFTs,XRD and TG analyzers,respectively.The results indicated that coal blending could significantly decrease sodium release behaviors.For ash slagging characteristics,it is surprised to find that three out of four AFTs(deformation temperature,softening temperature,hemispherical temperature)show an U-shaped correlation with blending ratio,indicating that a low ratio possibly causes more severe ash slagging problem.It is ascribed to the formation of substantial percentage of fusible Na-containing silicates and aluminosilicates.In addition,coal blending greatly increases ST-DT,implying that the ability of resistance to bed temperature fluctuation is markedly enhanced.Due to the high level of alkali and alkaline species,the synergistic effect is clearly observed during co-gasification.Taking all key indices into consideration,30%blending ratio of Wuhai coal is recommended.

关键词： co-gasification coal blending ash slagging sodium release

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SIMULATION OF O_(2)-BLOWN co-gasification OF WOOD CHIP AND POTATO PEEL FOR PRODUCING SYNGAS

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Frontiers of Agricultural Science and Engineering 2023年第3期10卷 448-457页

作者： Yulin HU Kang KANG Iker Zulbaran ALVAREZ Nasim MIA Aadesh RAKHRA Faculty of Sustainable Design Engineering University of Prince Edward IslandCharlottetownPEC1A 4P3Canada Biorefining Research Institute Lakehead UniversityThunder BayONP7B 5E1Canada

Potato is the fifth largest agricultural crop in Canada and contributes to the generation of an abundant amount of potato peel.However,disposal/recycling this peel remains a challenge due to the stringent environmental regulations.consequently,there is a lack of an appropriate recycling and valorization methods of potato peel.gasification is an effective technology for producing syngas and an ecofriendly waste disposal approach.Syngas is an important industrial intermediate to produce synthetic fuels and chemicals.To develop an ecofriendly and cost-effective valorization approach for potato peel,this study used a mixture of woody biomass(i.e.,wood chips)and potato peel to produce syngas by co-gasification using O_(2) as the gasifying agent at a constant equivalence ratio of 0.3 using Aspen Plus simulation software.The influences of gasification temperature and wood chip/potato peel weight ratio on the carbon conversion efficiency(CCE),and product gas composition(molar fraction)and lower heating value(LHV)of product gas were investigated.This simulation indicated that a positive synergistic interaction occurs between wood chips and potato peel in co-gasification process in terms of an increase in CCE by comparing the arithmetic value and real value at all simulated wood chip to potato peel weight ratios(44.9%to 85.8%,46.5%to 76.2%,and 48.1%to 78.6%at ratios of 25:75,50:50,and 75:25,respectively,for wood chips to potato peel).While the molar fraction of H_(2) and co decreased continuously with increase in the weight percentage of wood chips in the wood chip-potato peel mixture from 0 wt%to 100 wt%(H_(2),at 42.1 mol%to 41.4 mol%;and co at 44.0 mol%to 40.4 mol%),accompanied by a decrease of the LHV of the product gas(10.3 to 9.78 MJ·Nm^(−3)).The study concluded that co-gasification for producing syngas is feasible and environmental-friendly option to recycle and valorize potato peel.

关键词： Aspen Plus co-gasification potato peel syngas simulation waste reduction wood chip

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co-gasification of coal and biomass an emerging clean energy technology: Status and prospects of development in Indian context

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International Journal of Mining Science and Technology 2019年第2期29卷 171-186页

作者： Alka D.Kamble Vinod Kumar Saxena Prakash Dhondiram Chavan Vinod Atmaram Mendhe Department of Chemical Engineering Indian Institute of Technology (ISM) CSIR-Central Institute of Mining and Fuel Research

co-gasification of coal and biomass is emerging as potential clean fuel technology to achieve high thermodynamic efficiency with relatively low co2 emission. The coal and biomass have been exclusively gasified more than a century to obtain gas–liquid fuels and the production of chemicals. co-gasification has higher efficiency than the solitary coal gasification because the cellulose, hemicellulose and lignin content of biomass help to ignite and enhance the rate of gasification. It is suggested that the extensive research on carbon reactivity pattern, heat release, reaction kinetics, etc. may support to reduce the uncertainties in the co-gasification performance of coal and biomass blends, particularly in India. The prospects of co-gasification technology in Indian context have been discussed considering the abundance of varieties of coal and biomass. The suitability of existing gasifier procedures and their limitations with operating parameters like temperature, residence time, density optimisation, feed rate, agglomeration intensity, the tar formation and techno-economics involved are described. Also, this paper reviews the research highlights of the history of co-gasification and the advancement in upcoming challenges like a design of gasifier, access and preparation of biomass, disposal of residue, environmental concerns and reassurance to the operators for execution of large and small-scale projects.

关键词： co-gasification coal Biomass Clean fuel Advancement Challenges

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Development of New co-gasification Technology Based on Blast Furnace

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Journal of Iron and Steel Research(International) 2005年第6期12卷 8-13页

作者： ZHAO Yue-hong WEN Hao GUO Zhan-cheng XU Zhi-hong Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

A new co-gasification technology was proposed. The core of this co-gasification technology is a gasifier capable of being operated on a wide range of fuels and being reconstructed from blast furnace or shaft furnace. Based on this innovative concept, the lab-scale experiment and modeling study were carried out to demonstrate its technical validity and thermodynamic characteristics. The obtained results indicate that co-gasification process can be undertaken under ideal thermodynamic conditions where quasi-equilibrium could be reached without catalysts and Aspen Plus is a useful tool for this process development. Furthermore, potential applications of co-gasification were discussed.

关键词： blast furnace gasifier, DRI Aspen Plus co-gasification

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conversion Synergies during Steam co-gasification of Ligno-Cellulosic Simulated Biomass with coal

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Journal of Sustainable Bioenergy Systems 2012年第4期2卷 97-103页

作者： Joseph H. Kihedu Ryo Yoshiie Yoko Nunome Yasuaki Ueki Ichiro Naruse EcoTopia Science Institute Nagoya University Nagoya Japan Graduate School of Engineering Nagoya University Nagoya Japan

Lignin and cellulose chemicals were used as artificial biomass components to make-up a simulated biomass. Alkali and Alkaline Earth Metal (AAEM) as well as volatile matter contents in these chemicals were much different from each other. co-gasification of coal with simulated biomass shows improved conversion characteristics in comparison to the average calculated from separate conversion of coal and simulated biomass. Two conversion synergetic peaks were observed whereby the first peak occurred around 400℃ while the second one occurred above 800℃. Although co-gasification of coal with lignin that has high AAEM content also shows two synergy peaks, the one at higher temperature is dominant. co-gasification of coal with cellulose shows only a single synergy peak around 400℃ indicating that synergy at low temperature is related with interaction of volatiles. Investigation of morphology changes during gasification of lignin and coal, suggests that their low reactivity is associated with their solid shape maintained even at high temperature.

关键词： co-gasification Synergy Biomass Cellulose Lignin

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Improving supercritical water gasification of sludge by oil palm empty fruit bunch addition: Promotion of syngas production and heavy metal stabilization

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Chinese Journal of Chemical Engineering 2020年第1期28卷 293-298页

作者： Zhouchao Weng Ekkachai Kanchanatip Dwi Hantoko Mi Yan Hongcai Su Sicheng Zhang Guobin Wang Institute of Energy and Power Engineering Zhejiang University of TechnologyHangzhou 310014China Department of Chemical Engineering Institut Teknologi BandungBandung 40132Indonesia Center of Excellence in Environmental Catalysis and Adsorption Faculty of EngineeringThammasat UniversityPathumthani 12120Thailand

The co-gasification of sewage sludge and palm oil empty fruit bunch(EFB) in supercritical water(SCW) was conducted at 400 °C with a pressure of over 25 MPa. This study aimed to investigate the influence of EFB addition on the syngas production and its composition. The heavy metal distribution and the leaching potential of the solid residue were also assessed. The results showed that syngas yield significantly increased with the addition of EFB into the feedstock. The cold gas efficiency(CGE) and carbon efficiency(CE) of co-gasification were higher than those of individual gasification. The actual syngas production from co-gasification of sludge and EFB was 45% higher than the theoretical total volume. The results indicated that the addition of EFB to sludge had the synergetic promotion effect on syngas production from sludge and EFB in supercritical water. This enhancement might be due to the dissolution of alkali metals from EFB and the adjustment of organic ratio. In addition, higher percentage of heavy metals were deposited and stabilized in the solid residue after SCWG. The leaching concentration of heavy metals from the solid residues was decreased to a level below the standard limit which enables it to be safely disposed of in landfill. In conclusion, the EFB addition has been proved to promote syngas production,as well as, stabilize the heavy metal in solid residues during co-SCWG.

关键词： co-gasification Supercritical water Sludge Empty fruit bunch Syngas Heavy metal

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An advanced ash fusion study on the melting behaviour of coal,oil shale and blends under gasification conditions using picture analysis and graphing method

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Chinese Journal of Chemical Engineering 2021年第4期34卷 393-407页

作者： Yang Meng Peng Jiang Yuxin Yan Yuxin Pan Xinyun Wu Haitao Zhao Nusrat Sharmin Edward Lester Tao Wu Cheng Heng Pang Department of Chemical and Environmental Engineering The University of Nottingham Ningbo ChinaNingbo 315100China Ningbo New Materials Institute The University of NottinghamNingbo 315042China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridge 02139USA Department of Chemical and Environmental Engineering The University of NottinghamNottingham NG72RDUK Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province The University of Nottingham Ningbo ChinaNingbo 315100China

This study investigates the potential of solid fuel blending as an effective approach to manipulate ash melting behaviour to alleviate ashrelated problems during gasification,thus improving design,operability and safety.The ash fusion characteristics of Qinghai bituminous coal together with Fushun,Xinghua and Laoheishan oil shales(and their respective blends)were quantified using a novel picture analysis and graphing method,which incorporates conventional ash fusion study,dilatometry and sintering strength test,in a co/co_(2)atmosphere.This imagebased characterisation method was used to monitor and quantify the complete melting behaviour of ash samples from room temperature to 1520℃.The impacts of blending on compositional changes during heating were determined experimentally via Xray diffraction and validated computationally using FactSage.Results showed that the melting point of Qinghai coal ash to be the lowest at 1116℃,but would increase up to 1208℃,1161℃and 1160℃with the addition of 30%50%of Laoheishan,Fushun,and Xinghua oil shales,respectively.The formation of highmelting anorthite and mullite structures inhibits the formation of lowmelting hercynite.However,the sintering point of Qinghai coal ash was seen to decrease from 1005℃to 855℃,834℃,and 819℃in the same blends due to the formation of lowmelting aluminosilicate.Results also showed that blending directly influences the sintering strength during the various stages of melting.The key finding from this study is that it is possible to mitigate against the severe ash slagging and fouling issue arising from high calcium and iron coals by cogasification with a high silicaalumina oil shale.Moreover,blending coals with oil shales can also modify the ash melting behaviour of fuels to create the optimal ash chemistry that meets the design specification of the gasifier,without adversely affecting thermal performance.

关键词： Oil shale coal Image-based ash fusion test co-gasification Mineral transformation

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A biomass gasification system for synthesis gas from the new method

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Natural Science 2009年第3期1卷 195-203页

作者： Li-Qun Wang Yu-Huan Dun Heng Tang Tong-Zhang Wang 不详

This paper describes a single fluidized bed by the two-step gasification of the working method, process and biomass and coal co-gasification by a certain proportion of the results of a typical run. The results show that the biomass gasifi-cation technology for raw materials has a wide adaptability, the tar content in the gas is less than 10mg/m3,component in it ,the H2+co>70%, H2/C ≈1~2,especially suitable for biomass from hydrogen, synthetic alcohol fuel, is a promising approach.

关键词： Fuidized Bed Double Bed Biomass Synthesis Gas co-gasification Steam gasification

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