High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking Coal
High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking Coal
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烘焙生物质及其与不结块煤的混合物制成的高强度型焦
DOI：
10.1021/acs.energyfuels.2c01722
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发表时间：
2022
期刊：
影响因子：
5.3
通讯作者：
and J.-i. Hayashi
中科院分区：
文献类型：
--
作者：
A. Wibawa;U.P.M. Ashik;S. Kudo;S. Asano;X. Gao;and J.-i. Hayashi
在我们之前关于用杉木生产高强度冶金焦的研究的基础上，我们研究了用杉木(TC)和非粘结煤的混合物通过粉碎到<；100μm、混合、无粘结剂热压成型和碳化来生产高强度冶金焦炭。在型煤中TC质量分数为0-100%、烘烤温度为250-300°C和煤种(亚烟煤或中挥发分烟煤)的整个范围内，这些顺序工艺生产的焦炭的抗拉强度为5-17兆帕，相当于或高于常规焦炭(5-6兆帕)的抗拉强度。在许多条件下，TC和煤的混合阻碍了焦炭的致密化，这是因为在许多条件下，TC在碳化过程中阻碍了收缩较大的TC衍生颗粒的收缩。当TC质量分数超过50%时，焦炭强度出现正协同效应，煤基颗粒分散在TC基颗粒的基质中，在碳化过程中与其结合，起到增强基质的作用。扫描电子显微镜观察到了煤基和TC基一次粒子之间的结合。在成型前将混合的TC和煤共硫化至<；40μm，可获得强度高达23-28兆帕的焦炭。细粉碎提高了焦炭体积中TC衍生颗粒与煤基颗粒之间的粘结频率以及TC衍生颗粒与煤基颗粒之间的结合频率。来自TC-煤混合物的焦炭的强度通常遵循来自TC的焦炭和煤的焦炭强度的体积相加。这是通过在≈10μm或更小的尺度内将TC和煤的初级颗粒混合来实现的。
In continuation of our previous study on production of high-strength metallurgical coke from torrefied softwood (cedar), we studied coke production from a mixture of torrefied cedar (TC) and noncaking coal by pulverization to sizes <100 μm, mixing, binderless hot briquetting, and carbonization. These sequential processes produced coke with a tensile strength of 5–17 MPa, which was equivalent to or greater than that of conventional coke (5–6 MPa), from TC-coal mixtures over the entire ranges of TC mass fraction in briquette of 0–100%, torrefaction temperature of 250–300 °C, and choice of coal (sub-bituminous or medium-volatile bituminous coal). The mixing of TC and coal hindered densification of coke due to hindrance of shrinkage of more-shrinkable TC-derived particles during the carbonization under many of the conditions. Nevertheless, positive synergy occurred in the coke strength at TC mass fractions of over 50%, where coal-derived particles were dispersed in the matrix of TC-derived particles, bonded to them during the carbonization, and behaved as a reinforcement of the matrix. The bonding between TC-derived and coal-derived primary particles was revealed by scanning electron microscopy. Copulverization of mixed TC and coal to sizes <40 μm before the briquetting gave cokes having strengths as high as 23–28 MPa. The fine pulverization increased the frequencies of mutual bonding of TC-derived particles and coal-derived particles and bonding between TC-derived and coal-derived particles per coke volume. The strength of coke from the TC-coal mixture generally followed volume-based additivity of strengths of cokes from TC and coal. This was realized by mixing primary particles of TC and coal within ≈10 μm scale or even smaller.
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DOI：
10.2355/tetsutohagane.100.1347
发表时间：
2014
影响因子：
0.3
作者：
Koki Nishioka;Yutaka Ujisawa;T. Inada
通讯作者：
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影响因子：
1.8
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影响因子：
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作者：
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通讯作者：
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影响因子：
1.8
作者：
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影响因子：
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作者：
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