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| Composition and combustion dynamics analysis of typical crop straws |
| Received:May 26, 2018 |
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| KeyWord:crop straws;compositions;thermal gravimetric analysis;combustion dynamics;maximum weight loss rate |
| Author Name | Affiliation | | ZHAO Wen-xia | School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang 050018, China
Hebei VOCs and Odour Pollution Control Engineering Laboratory, Shijiazhuang 050018, China | | YANG Zhao-xu | School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang 050018, China
Hebei VOCs and Odour Pollution Control Engineering Laboratory, Shijiazhuang 050018, China | | LIU Shuai | School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang 050018, China
Hebei VOCs and Odour Pollution Control Engineering Laboratory, Shijiazhuang 050018, China | | REN Ai-ling | School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang 050018, China
Hebei VOCs and Odour Pollution Control Engineering Laboratory, Shijiazhuang 050018, China |
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| Abstract: |
| In order to discuss the composition and the combustion characteristics of typical crop straws from a typical region of China, three typical crop straws (wheat straw, rice straw, and corn straw) were chosen from typical crop straw planting areas (Hebei Province and Jilin Province). The compositions (industrial analysis, elemental analysis, and fiber composition) were analyzed and the combustion dynamics characteristics were studied using different heat and a thermogravimetric analyzer. The results showed that the contents of ash and synthetic cellulose of the rice straw were the highest among the three straws, and that the contents of S and Hg of the corn straw were the highest. Other industrial analyses (moisture, volatile matter, and fixed carbon) and element (C, H, O, and N) compositions showed no significant differences. At different heating rates, the overall trends of the TG and DTG curves of the three straws were similar. The two distinct weightlessness peaks corresponded to the precipitation and combustion stage of volatile matter and the combustion stage of fixed carbon, respectively; the weight loss rate of the former was much higher than that of the latter. At the same heating rates, the maximum weight loss rates of the three straws in the low temperature combustion zone (volatile matter precipitation and combustion stage) were from high to low in the order of wheat straw > rice straw > corn straw, while those of the rice straw and corn straw in the high temperature combustion zone (fixed carbon combustion stage) showed no significant difference, and both were higher than that of wheat straw. The combustion process of the straws in the low temperature zone and high temperature zone accorded with the two-stage combustion kinetics equation. The results indicated that the three straws had the characteristics of high volatile matter, low ash (except rice straw), and low sulfur contents. The weight loss of straw combustion was mainly due to volatile matter precipitation and combustion followed by fixed carbon combustion, while the contribution of water evaporation was the least. The peak shape of fast weightlessness was not only related to the composition of straw, but also to the initial precipitation temperature of volatile matter. The two-stage reaction model can scientifically describe the combustion kinetics of crop straws. |
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