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| Optimization of Principal Elements Analysis Conditions of Lignocellulose by Response Surface Methodology in Thermal Conductivity Method of High Temperature Combustion |
| Received:April 11, 2024 Revised:June 06, 2024 |
| DOI：10.11981/j.issn.1000-6842.2025.01.40 |
| Key Words:lignocellulose;principal elemental analysis;high temperature combustion thermal conductivity method;response surface method |
| Fund Project:国家重大科学仪器研发项目（2018YFF01014000）；湖南省学位与研究生教学改革研究项目（2021JGYB133）；湖南省教育厅科学研究重点项目（23A0269）。 |
| Author Name | Affiliation | Postcode | | CHEN Kangdao | College of Chemistry and Chemical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | WANG Hongmei* | College of Chemistry and Chemical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | SHI Yanjun | College of Chemistry and Chemical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | XU Kaiqun | Changsha Kaiyuan Instruments Co.， Ltd.， Changsha， Hu’nan Province， 410114 | 410100 |
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| Abstract: |
| In order to accurately determine lignocellulosic main element content， in this study， based on the analytical conditions for the determination of coal main element by thermal conductivity method of high temperature combustion， four significant influencing factors of determination of lignocellulosic main element content were selected by second-order factor method. The effects of significant influencing factors on the determination of lignocellulosic main element content were in descending order as follows： oxygen supply time， oxygen supply flow， sample mass and combustion tube temperature. The test parameters were optimized by single factor experiment and response surface method. The optimum experimental conditions were as follows： sample mass was 30 mg， oxygen supply time was 90 s， oxygen supply flow was 100 mL/min， and combustion tube temperature was 950 ℃. The main element analysis of 6 lignocellulosic standard substances was carried out under the optimum test conditions， and compared with coal test conditions and national standard method. The results showed that the accuracy and precision of the optimized lignocellulose main element analysis conditions were superior to the coal test conditions and the national standard method. The standard deviation of the main element content determination <0.2， meeting target requirement for standard deviation ≤0.3 in C， H， N， S content determination， and the relative standard deviation （RSD， n=6） was in the range of 0.04%~1.35%. |
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