Reduction of fine particulate matter by blending lignite with semi-char in a down-fired pulverized coal combustor
Reduction of fine particulate matter by blending lignite with semi-char in a down-fired pulverized coal combustor
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在下燃式煤粉燃烧器中将褐煤与半焦混合来减少细颗粒物
DOI：
10.1016/j.fuel.2016.04.026
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发表时间：
2016-10
期刊：
影响因子：
7.4
通讯作者：
Yao Qiang
中科院分区：
文献类型：
--
作者：
Huang Qian;Li Shuiqing;Li Gengda;Zhao Yingqi;Yao Qiang
随着低阶煤的使用不断增加，褐煤低温热解生产的提质半焦是清洁高效利用的有前景的替代品之一。这些热解半焦与母煤的共烧受到了更多的关注。在本文中，一种由呼伦贝尔（HB）褐煤在 504 °C 热解温度下生产的半焦在 25 kW 自持式粉煤燃烧器中燃烧。使用不同质量混合比例的半焦（0％、40％、60％和100％）。结果表明，HB褐煤纯燃烧的PM0.1产量是半焦的约1.6倍。煤/焦混合物的 PM0.1 产量远低于两种混合燃料产量的线性总和（不考虑它们的相互作用）。对于较粗的 PM 模式，PM0.1–1 和 PM1–10 粒子的减少仍然存在。纯燃烧情况下不同的PM产量归因于挥发性矿物种类较少以及燃烧过程中半焦的破碎程度较低。假设了一种在混煤燃烧过程中减少颗粒物的机制。 PM0.1 量减少，因为挥发的矿物质被先前形成的半炭表面大量清除，时间尺度分析部分证明了这一点。然后，清除的化合物充当“粘合剂”，将灰颗粒转化为更大的团聚物，这可能会导致 PM0.1-10 产量减少。
With the increasing use of low-rank coal, the upgraded semi-char produced through low-temperature pyrolysis of lignite is one of promising alternatives towards the clean and high efficient utilization. The co-firing of these pyrolytic semi-chars with parent coals has received more attention. In this paper, a kind of semi-char, produced from Hulunbuir (HB) lignite under a pyrolysis temperature of 504 °C, was burned in a 25 kW self-sustained pulverized coal combustor. Different mass blending ratios of semi-char (0%, 40%, 60% and 100%) were used. The results indicate that the PM0.1yield from pure combustion of HB lignite is ∼1.6 times of that from semi-char. The PM0.1yields of the coal/char blends are much less than the linear summation of yields of two blending fuels without considering their interactions. As for coarser PM mode, the reductions still exist for both PM0.1–1and PM1–10particles. The different PM yields of pure combustion cases are attributed to less volatile mineral species and also less fragmentation degree of semi-chars during combustion. A mechanism is postulated for PM reduction during the combustion of coal blends. PM0.1amounts are decreased since the volatilized mineral species is considerably scavenged by the previously formed semi-char surfaces, as partly evidenced from a time scale analysis. The scavenged compounds then serve as “glue” to convert ash particles to larger agglomerates, which may result in the reduction of PM0.1–10yields.
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DOI：
--
发表时间：
2005
期刊：
--
影响因子：
--
作者：
D. Latorre;A. Cecilia
通讯作者：
D. Latorre;A. Cecilia
影响因子：
7.4
作者：
L. Yan;RajenderKumar Gupta;T. Wall
通讯作者：
L. Yan;RajenderKumar Gupta;T. Wall
影响因子：
7.4
作者：
D. Quyn;Hongwei Wu;S. Bhattacharya;Chun-Zhu Li
通讯作者：
D. Quyn;Hongwei Wu;S. Bhattacharya;Chun-Zhu Li
影响因子：
7.4
作者：
Gao, Xiangpeng;Rahim, Muhammad Usman;Wu, Hongwei
通讯作者：
Wu, Hongwei
影响因子：
7.4
作者：
Li, Chun-Zhu
通讯作者：
Li, Chun-Zhu