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Effect of acid-associated mechanical pretreatment on the hydrolysis behavior of pine sawdust in subcritical water

Chinese Journal of Chemical Engineering 2023年第6期58卷 195-204页

作者： Wei Yang Yalun Ma Xu Zhang Fan Yang Dong Zhang Shengji Wu Huanghu Peng Zezhou Chen Lei Che College of Engineering Huzhou UniversityHuzhou 313000China School of Science and Engineering Huzhou CollegeHuzhou 313000China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China

The effects of sulfuric acid-associated mechanical pretreatment on the hydrolysis behavior of pine sawdust were investigated in this study.Sulfuric acid could act as an acidic catalyst to depolymerize holocellulose through cleavage of the glycosidic bonds,the dissociation energies of which were supplied by the impact of a ball on pine sawdust,during milling.The destruction of glycosidic and hydrogen bonds in pine sawdust resulted in a decrease of crystallinity and an increase of water solubility.The sulfuric acid could promote the hydrolysis of holocellulose and its hydrolysis products.It also destroyed the chemical linkages between holocellulose and lignin during ball milling.The cleavage of chemical linkages with holocellulose made lignin more difficult to hydrolyze in subcritical water,and higher activation energy was needed to hydrolyze pretreated pine sawdust at higher reaction temperatures.It also led to the formation of glucose char and aromatic-linked polymer char from the hydrolysis products of holocellulose.

关键词： Acid-associated mechanical pretreatment Subcritical water pine sawdust Hydrolysis behavior Kinetic parameters

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Gas Characteristics of pine sawdust Catalyzed Pyrolysis by Additives

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Journal of Thermal Science 2021年第1期30卷 333-342页

作者： YU Dongling JIN Guang PANG Yunji CHEN Yisheng GUO Shaopeng SHEN Shengqiang School of Energy and Environment Inner Mongolia University of Science and TechnologyBaotou 014000China School of Energy and Power Engineering Dalian University of TechnologyDalian 116023China

In order to effectively investigate the variation of gas production characteristics of biomass under normal-speed pyrolysis conditions,the gas production rate,gas production component yield and gas production calorific value of pine sawdust with adding Na_(2)CO_(3),CaO and Fe_(2)O_(3)were systematically analyzed.In the experiment,an improved tube furnace was used to research the pyrolysis process with the temperature from 350℃to 750℃.The results indicate that the gas yield rises with the increase of temperature without additives,reaching 19.59%at 750℃.The liquid yield reaches 59.38%at 450℃and then the yield change is small.CaO increases the calorific value of the pyrolysis product gas due to the adsorption of CO_(2).Na_(2)CO_(3)is fused with inorganic substances in the biomass to form a char skeleton structure.The effect of Fe2O3 on H2 is more obvious at higher temperature.Na_(2)CO_(3)has the most obvious effect on the pyrolysis of pine sawdust among the discussed additives,which effectively promotes the production of H_(2).

关键词： pine sawdust pyrolysis additive catalysis gas analysis

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Biomass chemical looping gasification for syngas production using modified hematite as oxygen carriers

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Journal of Environmental Sciences 2023年第3期125卷 171-184页

作者： Cong Jiang Xiaoyu Jin Tingting Xu Bo Xiao Zhiquan Hu Xun Wang School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

Syngas is a clean energy carrier and a major industrial feedstock. In this paper, syngas was produced via biomass chemical looping gasification(CLG) process. Hematite, the most common Fe-based oxygen carrier(OC), was modified with different metal oxides(CeO_(2), CaO and MgO) by the impregnation method. The hematite modified by CeO_(2), CaO and MgO was namely as CeO_(2)-hematite(CeO_(2)-H), CaO-hematite(CaO-H) and MgO-hematite(MgO-H), respectively. The introduction of CeO_(2), CaO and MgO enhanced the reactivity of lattice oxygen of hematite. The optimum condition for syngas production had been explored as the mass ratio of oxygen carrier to biomass(O/B) of 0.2, the mass ratio of steam to biomass(S/B) of0.75 and temperature of 800℃in the biomass CLG process. The CeO_(2)-H exhibited the most wonderful performance compared to that for CaO-H and MgO-H. The crystal composition of OC influenced greatly in the CLG process. CeFeO_(3)had a good oxygen mobility property and lattice oxygen releasing capacity due to the most oxygen vacancy distributed on the OC surface and the most active lattice oxygen, which is conducive to the biomass chemical looping gasification process for syngas production, leading to the highest gasification efficiency of 95.86% and gas yield of 1.20 m^(3)/kg of the three. Cyclic test proved that CeO_(2)-H had well sintering resistance and cyclic performance.

关键词： Chemical looping gasification Oxygen carrier Syngas Modified hematite pine sawdust

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Co-milling as a synergy factor for co-firing.A case study of wood/coal blends

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Carbon Resources Conversion 2023年第1期6卷 51-57页

作者： A.G.Matveeva Yu.F.Patrakov A.I.Sechin P.E.Plyusnin A.V.Kuznetsov E.M.Podgorbunskikh V.A.Bukhtoyarov A.L.Bychkov I.O.Lomovsky O.I.Lomovsky Institute of Solid State Chemistry and Mechanochemistry SB RASKutateladze Str.18Novosibirsk 630090Russia Federal Research Center of Coal and Coal Chemistry SB RASLeningradsky Ave.10Kemerovo 650065Russia National Research Tomsk Polytechnic University Lenina Str.30Tomsk 634050Russia Nikolaev Institute of Inorganic Chemistry SB RASAcademician Lavrentyev Ave.3Novosibirsk 630090Russia Kutateladze Institute of Thermophysics SB RASAcademician Lavrentyev Ave.1Novosibirsk 630090Russia

It is known that simple adding of wood allows one to accelerate the ignition of powder mixtures compared to the situation when pure coal is used.This study focuses on testing the hypothesis about the effect of co-milling coal and wood on their co-firing:is the case of composite powdered fuels should ensure the maximum possible efficiency of heat and mass transfer?Firstly,we will show that co-milling of coal and wood leads not independent size reduction of two materials but gives composite powder-coal-covered wood.For the composite fuel further reduction of the ignition delay time of air suspension and reduction of the limit volume concentration required for flame propagation have demonstrated.Obtained synergy also manifests in thermogravimetry.Here we propose a simple method for analyzing the mass loss curves.For any coal-to-wood sawdust ratio,combustion of the composites and mixtures both can be viewed as a weighted sum of the curves of individual components.But only in the case of composites calculated sawdust content is higher than the actual one:the mass loss is redistributed towards the stage occurring at lower temperatures due to geometry of wood/coal contact.

关键词： Co-firing Co-milling pine sawdust Coal TGA Synergy

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