Comparison of atmospheric and gas-pressurized oxidative torrefaction of heavy-metal-polluted rice straw
Comparison of atmospheric and gas-pressurized oxidative torrefaction of heavy-metal-polluted rice straw
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DOI：
10.1016/j.jclepro.2020.124636
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发表时间：
2021-02
影响因子：
11.1
通讯作者：
Mengjiao Tan;Hui Li;Zhongliang Huang;Zhiwei Wang;Ruoxuan Xiong;Shilin Jiang;Jiachao Zhang;Wu Zijian;Changzhu Li;Lin Luo
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文献类型：
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作者：
Mengjiao Tan;Hui Li;Zhongliang Huang;Zhiwei Wang;Ruoxuan Xiong;Shilin Jiang;Jiachao Zhang;Wu Zijian;Changzhu Li;Lin Luo
在管式反应器（常压，AP）和高压釜（气压，GP）中对受重金属污染的稻草进行了氧化焙烧，比较了焙烧温度、载气组成和反应器类型对焙烧产物性质的影响。与AP相比，GP处理后的稻草固体产率、挥发分、固定碳、氢和氧含量较低，总色变（ΔE）和燃烧特性因子（SN）较低，但容重、热值、灰分和碳含量较高，燃烧温度（TiandTf）和燃料比较高。稻草AP烘干后的失重率、挥发分、元素含量、高温热值和燃烧特性与其颜色参数具有良好的相关性，表明在工业水平上用肉眼识别和预测AP烘干后的RS在技术上是可行的。然而，大量的典型重金属残留在GP-焙烧的固体产品中，具有较低的生物有效性，表明GP焙烧可以作为一种低成本和安全的重金属污染的稻草在工业规模的预处理。
The oxidative torrefaction of rice straw polluted by heavy metals was carried out in a tube reactor (atmospheric pressure, AP) and an autoclave (gas-pressurized, GP), in order to compare the effects of the torrefaction temperature, carrier gas composition, and reactor type on torrefied products’ properties. Compared with the AP, the GP-torrefied rice straw had a lower solid yield, volatile matter, fixed carbon, hydrogen and oxygen contents, lower overall colour change (ΔE), combustion characteristic factor (SN), but a higher bulk density, higher heating value, ash and carbon content, higher combustion temperatures (TiandTf) and fuel ratio. The weight loss, volatile matter, element, higher heating values and combustion characteristics of the AP-torrefied rice straw showed good correlations with its colour parameters, which indicating that it is technically feasible to identification and prediction by the human eye of AP-torrefied RS at the industrial level. However, higher amount of typical heavy metals remained in the GP-torrefied solid products with lower biological availability, indicating that GP torrefaction can be utilized as a low-cost and safe pre-treatment for heavy-metal-polluted rice straw at the industrial scale.