PYROLYSIS CHARACTERISTICS AND PRODUCT DISTRIBUTION OF HERB RESIDUES CATALYZED BY POTASSIUM CARBONATE

Fang Gang; Lang Lin; Yang Xinmiao; Yin Xiuli; Wang Mingfeng; Wu Chuangzhi

doi:10.19912/j.0254-0096.tynxb.2020-1267

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (7) : 430-438. DOI: 10.19912/j.0254-0096.tynxb.2020-1267

PYROLYSIS CHARACTERISTICS AND PRODUCT DISTRIBUTION OF HERB RESIDUES CATALYZED BY POTASSIUM CARBONATE

Fang Gang^1,2, Lang Lin², Yang Xinmiao³, Yin Xiuli², Wang Mingfeng³, Wu Chuangzhi^1,2

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Abstract

Woody herb residues were used as the raw materials, and K₂CO₃ catalysts with different contents were simply loaded by the impregnation method. The catalytic pyrolysis characteristics and kinetic parameters of herb residues were analyzed by thermogravimetric experiments （TG）, and Starink method was used for kinetic analysis to calculate the apparent activation energy of catalytic pyrolysis reaction. A fixed-bed reactor was used to optimize the catalytic pyrolysis conditions, and the effect of K₂CO₃ loadings on the product distribution of the herb residue pyrolysis was investigated as well. The TG/DTG results of thermogravimetric analysis show that K₂CO₃ could significantly reduce the initial pyrolytic temperature （Ti） and maximum pyrolytic temperature （Tmax）, and greatly reduce the activation energy of the herb catalytic pyrolysis during the rapid weight loss. The greater the K₂CO₃ loading is, the higher efficient the herb catalytic pyrolysis is. The fixed-bed pyrolysis experiments show that K₂CO₃ loading is the most important factor for the catalytic pyrolysis of the herb residues based on the orthogonal analysis. It is proved that K₂CO₃accelerates the low-temperature depolymerization of biological macromolecules and the catalytic cracking of pyrolysis intermediates. Potassium carbonate not only reduces the yield of pyrolysis oil, but also obviously increases the yield of syngas （H₂, CO） and small molecule low-carbon hydrocarbon gases such as C₂H₆ and C₃H₈, which is conducive to increasing the H₂/CO molar ratio of pyrolysis gas.

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biomass / pyrolysis / kinetic parameters / potassium carbonate / herb residues

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Fang Gang, Lang Lin, Yang Xinmiao, Yin Xiuli, Wang Mingfeng, Wu Chuangzhi. PYROLYSIS CHARACTERISTICS AND PRODUCT DISTRIBUTION OF HERB RESIDUES CATALYZED BY POTASSIUM CARBONATE[J]. Acta Energiae Solaris Sinica. 2022, 43(7): 430-438 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1267

References

[1] WANG P, ZHAN S H, YU H B, et al.The effects of temperature and catalysts on the pyrolysis of industrial wastes (herb residue)[J]. Bioresource technology, 2010, 101(9): 3236-3241.
[2] LI T T, GUO F Q, LI X L, et al.Characterization of herb residue and high ash-containing paper sludge blends from fixed bed pyrolysis[J]. Waste management, 2018, 76(1): 544-554.
[3] 王明峰, 蒋恩臣, 周岭玉. 玉米秸秆热解动力学分析[J]. 农业工程学报, 2009, 25(2): 204-207.
WANG M F, JIANG E C, ZHOU L Y.Kinetic analysis of cornstalk pyrolysis[J]. Transactions of the CSAE, 2009, 25(2): 204-207.
[4] 李顺, 王贤华, 陈应泉, 等. 钾盐对纤维素热解特性的影响[J]. 可再生能源, 2015, 33(8): 1274-1280.
LI S, WANG X H, CHEN Y Q, et al.The influence of potassium salts on the pyrolysis of cellulose[J]. Renewable energy resources, 2015, 33(8): 1274-1280.
[5] JIA S, NING S Y, YING H, et al.High quality syngas production from catalytic gasification of woodchip char[J]. Energy conversion and management, 2017, 151: 457-464.
[6] FAN H J, CHANG X L, WANG J, et al.Catalytic pyrolysis of agricultural and forestry wastes in a fixed-bed reactor using K₂CO₃ as the catalyst[J]. Waste management & research, 2020, 38(1): 78-87.
[7] 陈冠益, 邱旭辉, 郭倩倩, 等. 含水率及温度对中药渣热解特性的影响[J]. 过程工程学报, 2020, 21(9): 1109-1115.
CHEN G Y, QIU X H, GUO Q Q, et al.Effect of moisture content and temperature on Chinese medicine residue pyrolysis characteristics[J]. The Chinese journal of process engineering, 2020, 21(9): 1109-1115.
[8] ZHOU W H, BAI B, CHEN G Y, et al.Study on catalytic properties of potassium carbonate during the process of sawdust pyrolysis[J]. International journal of hydrogen energy, 2018, 43(30): 13829-13841.
[9] 王涛, 沈迎, 任乾超. 不同升温速率下煤粉热解特性研究[J]. 青海电力, 2018, 37(2): 22-29, 40.
WANG T, SHEN Y,REN Q C.Research on the thermal decomposition characteristics of the coal powder with different temperature rise rate[J]. Qinghai elecric power, 2018, 37(2): 22-29, 40.
[10] STARINK M J.The determination of activation energy from linear heating rate experiments: a comparison of the accuracy of isoconversion methods[J]. Thermochimica acta, 2003, 404(1/2): 163-176.
[11] LV D Z, XU M H, LIU X W, et al.Effect of cellulose, lignin, alkali and alkaline earth metallic species on biomass pyrolysis and gasification[J]. Fuel processing technology, 2010, 91(8): 903-909.
[12] GAUR S, REED T B,DEKKER M. Thermal data for natural and synthetic fuels[J/OL]. The Canadian journal of chemical engineering, 2005,https://doi.org/10.1002/cjce.5450830230.
[13] ZHOU L, JIA Y, Nguyen T H, et al.Hydropyrolysis characteristics and kinetics of potassium-impregnated pine wood[J]. Fuel processing technology, 2013, 116: 149-157.
[14] NISHIMURA M, IWASAKI S, HORIO M.The role of potassium carbonate on cellulose pyrolysis[J]. Journal of the Taiwan Institute Chemical Engineers, 2009, 40(6): 630-637.
[15] GUO F Q, LIU Y, WANG Y, et al.Pyrolysis kinetics and behavior of potassium-impregnated pine wood in TGA and a fixed-bed reactor[J]. Energy conversion and management, 2016, 130: 184-191.
[16] PENG C N, ZHANG G Y, YUE J R, et al.Pyrolysis of lignin for phenols with alkaline additive[J]. Fuel processing technology, 2014, 124: 212-221.
[17] 赵伟, 袁洪友, 黄艳琴, 等. 中药生物质原料与药渣热解特性对比研究[J]. 太阳能学报, 2019, 40(6): 1684-1692.
ZHAO W, YUAN H Y, HUANG Y Q, et al.Comparison of pyrolysis characteristics between feedstock and residue for Chinese herb medicine[J]. Acta energiae solaris sinica, 2019, 40(6): 1684-1692.
[18] WANG Z Y, WANG F, CAO J Q, et al.Pyrolysis of pine wood in a slowly heating fixed-bed reactor: potassium carbonate versus calcium hydroxide as a catalyst[J]. Fuel processing technology, 2010, 91(8): 942-950.
[19] VERAA M J, BELL A T.Effect of alkali metal catalysts on gasification of coal char[J]. Fuel, 1978, 57(4): 194-200.