1.College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2.Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Inner Mongolia University of Technology, Hohhot 010051, China
This study makes an investigation of the co-combustion performance of rape straw and lignite. First, rape straw was heat-treated at different temperatures (300, 400, 500 ℃). Then, the heat-treated rape straw was mixed into lignite in a certain proportion. The structural differences of heat-treated rape straw were analyzed by SEM, FT-IR, XRD and other characterization methods. At the same time, the combustion reaction performance of heat-treated rape straw and its blends with lignite was investigated by thermogravimetric analyzer, and the synergistic effect between the blends was analyzed and compared. The results showed that the combustion reaction performance of heat-treated rape straw is decreased due to the decomposition and precipitation of volatile matter. With the increase of heat treatment temperature, aliphatic groups and oxygen-containing functional groups are decrease, and stable aromatic compounds increase relatively. The blends of heat-treated rape straw and lignite show combustion hysteresis. With the increase of rape straw treatment temperature, the combustion weight loss peak of the volatiles of the blends is gradually weakened, while the weight loss rate of fixed carbon combustion is the smallest at 500 ℃, and the temperature corresponding to the maximum weight loss rate is not much different. When the heat treatment temperature is higher than 400 ℃, the synergistic effect of combustion between the blends is significantly weakened.
煤炭是我国的主要能源,而煤炭在燃烧过程中会排放大量的温室气体,而且随着工业化的发展将会出现能源短缺问题,同时燃烧过程也加大了对环境的污染[1],因此寻求一种清洁高效的能源非常必要。生物质能作为一种广泛使用的可再生能源,将其与煤共燃是实现化石能源低碳利用的可行途径[2]。目前,我国产生的农林废弃物生物质主要以农作物秸秆类为主,燃烧秸秆比燃烧煤具有低的污染性,且燃烧过程中SO X 、NO X 、CO2等排放量较少,可有效减轻温室效应[3]。
VAROLM, ATIMTAYA T, BAY B, et al. Investigation of co-combustion characteristics of low quality lignite coals and biomass with thermogravimetric analysis[J]. Thermochimica acta, 2010, 510(1/2): 195-201.
[5]
CONGK L, HANF, ZHANGY G, et al. The investigation of co-combustion characteristics of tobacco stalk and low rank coal using a macro-TGA[J]. Fuel, 2019, 237: 126-132.
[6]
GUOF H, HEY, HASSANPOURA, et al. Thermogravimetric analysis on the co-combustion of biomass pellets with lignite and bituminous coal[J]. Energy, 2020, 197: 117147.
[7]
YUANY Q, ZUOH B, WANGJ X, et al. Co-combustion behavior, kinetic and ash melting characteristics analysis of clean coal and biomass pellet[J]. Fuel, 2022, 324, Part C: 124727.
[8]
PAIMANM E S, HAMZAHN S, IDRISS S, et al. Synergistic effect of co-utilization of coal and biomass char: an overview[C]//IOP Conference Series: Materials Science and Engineering, Putrajaya, Malaysia: IOP, 2018: 012003.
[9]
YANGG, LIUY R, GAOL J, et al. Investigation of the synergistic effect and kinetic behavior of anthracite and biochar during co-combustion process in pure oxygen atmosphere[J]. Journal of the Energy Institute, 2022, 101: 1-18.
XIAOZ Z, WANGS Z, LUOM, et al. Combustion characteristics and synergistic effects during co-combustion of lignite and lignocellulosic components under oxy-fuel condition[J]. Fuel, 2022, 310, Part B: 122399.
[15]
CHENL C, WENC, WANGW Y, et al. Combustion behaviour of biochars thermally pretreated via torrefaction,slow pyrolysis,or hydrothermal carbonisation and co-fired with pulverised coal[J]. Renewable Energy, 2020, 161: 867-877.
[16]
KASTANAKIE, VAMVUKAD. A comparative reactivity and kinetic study on the combustion of coal-biomass char blends[J]. Fuel, 2006, 85(9): 1186-1193.
OLADEJOJ M, ADEGBITES, PANGC H, et al. A novel index for the study of synergistic effects during the co-processing of coal and biomass[J]. Applied Energy, 2017, 188: 215-225.
[26]
OLADEJOJ, ADEGBITES, GAOX, et al. Catalytic and non-catalytic synergistic effects and their individual contributions to improved combustion performance of coal/biomass blends[J]. Applied Energy, 2018, 211: 334-345.