Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives
Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives
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生物质颗粒燃烧过程中钾释放及其与抑制添加剂相互作用的实验研究
DOI：
10.1016/j.fuel.2019.116346
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发表时间：
2020-01
期刊：
影响因子：
7.4
通讯作者：
Cen Kefa
中科院分区：
文献类型：
--
作者：
Liu Yingzu;Wan Kaidi;He Yong;Wang Zhihua;Xia Jun;Cen Kefa
本研究以玉米秸秆和杨树两种生物质作为典型的农业和木本生物质燃料进行了研究。首先，利用激光诱导击穿光谱（LIBS）研究了燃烧生物质颗粒中钾(K)的释放特性。为了进一步研究K释放与燃烧过程的相关性，利用LIBS同时测量了燃烧参数，包括球团表面温度和球团直径。杨树钾释放史呈现双峰趋势，而玉米秸秆钾释放史呈现单峰趋势。两种生物质样品在脱挥发阶段均表现出最强的K释放，与随后的焦烧和灰煮阶段相比。K释放量与球团温度的变化趋势相似，表明K释放量与燃烧过程密切相关。K的释放机制可归因于燃烧过程中温度的升高和化学键的破坏。然后，通过化学分馏处理生物质样品，考察了不同化学形态K的释放。测定了水溶性、氨溶性和盐酸溶性钾化合物的释放量。发现水溶性钾是主要释放的钾化合物。最后，在生物质样品中添加4种添加剂（2种纯添加剂，即二氧化硅和氧化铝）和2种典型天然矿物添加剂，即高岭土和云母)，考察其对K释放的抑制作用。天然吸附剂的抑制效果优于纯吸附剂。
In the present study, two types of biomass were investigated as typical agricultural and woody biomass fuel, i.e., corn straw and poplar. Firstly, laser induced breakdown spectroscopy (LIBS) was employed to investigate the release characteristics of potassium (K) from a burning biomass pellet. In order to further investigate the correlation between K release and the combustion process, combustion parameters including pellet surface temperature and pellet diameter were simultaneously measured with LIBS. A dual-peak trend is observed in the K release history of poplar, but only a single peak is found in that of corn straw. Both biomass samples show the strongest K release during the devolatilization stage in comparison with the subsequent char burnout and ash cooking stages. Similar tendencies are observed between K release and pellet temperature, which suggests that K release is closely related to the combustion process. The K release mechanism can be attributed to temperature rise and therefore breakdown of chemical bonds during combustion. Then the release of different chemical forms of K was investigated by chemical fractionation treatment of the biomass samples. The released amount of H2O-soluble, NH4Ac-soluble and HCl-soluble potassium compounds were obtained. The H2O-soluble potassium is found to be the major released potassium compound. Finally, four kinds of additives (two pure additives, i.e., silica and alumina, and two typical natural mineral additives, i.e., kaolin and mica) were added to the biomass samples to investigate their inhibition effects on K release. The natural sorbent additives show better inhibition effects than the pure ones.
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影响因子：
7.4
作者：
C. Erbel;M. Mayerhofer;P. Monkhouse;M. Gaderer;H. Spliethoff
通讯作者：
C. Erbel;M. Mayerhofer;P. Monkhouse;M. Gaderer;H. Spliethoff
影响因子：
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影响因子：
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作者：
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影响因子：
7.5
作者：
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通讯作者：
M. Paneru;S. Babat;J. Maier;G. Scheffknecht
影响因子：
15.9
作者：
S. E. Hosseini;M. Wahid
通讯作者：
S. E. Hosseini;M. Wahid