炭化过程中黏结剂与低阶煤的结合机理

WANG Ming-yi; CHANG Zhi-wei; LIU Yue-hua; SHANGGUAN Ju; DU Wen-guang; MA Rui; WANG Qi; LIU Jun-jie; LIU Shou-jun; YANG Song

doi:10.1016/S1872-5813(22)60062-8

炭化过程中黏结剂与低阶煤的结合机理

doi: 10.1016/S1872-5813(22)60062-8

王明义^{1, 2,},
常志伟^{2, 3,},
刘月华^{2, 3,},
上官炬^{2, 3,},
杜文广^{2, 3,},
马睿^{2, 3},
王琪^{2, 3,},
刘俊杰^{2, 3},
刘守军^{1, 2, 3, ,},
杨颂^{1, 2, ,}

1.
太原理工大学化学工程与技术学院, 山西太原 030024
2.
太原理工大学山西省民用清洁燃料工程中心, 山西太原 030024
3.
太原理工大学省部共建煤基能源清洁高效利用国家重点实验室, 山西太原 030024

详细信息

中图分类号: TQ536.1
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出版历程
- 收稿日期: 2022-04-30
- 修回日期: 2022-06-01
- 录用日期: 2022-06-04
- 网络出版日期: 2022-09-23
- 刊出日期: 2022-12-28

Bonding mechanism of binder and low-rank coal during carbonization

WANG Ming-yi^{1, 2
,},
CHANG Zhi-wei^{2, 3
,},
LIU Yue-hua^{2, 3
,},
SHANGGUAN Ju^{2, 3
,},
DU Wen-guang^{2, 3
,},
MA Rui^{2, 3},
WANG Qi^{2, 3
,},
LIU Jun-jie^{2, 3},
LIU Shou-jun^{1, 2, 3
, ,},
YANG Song^{1, 2
, ,}

1.
College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China
2.
Shanxi Engineering Center of Civil Clean Fuel, Taiyuan University of Technology, Taiyuan 030024, China
3.
State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by Shanxi Province Basic Research Plan (202103021223087), Shanxi Province Science and Technology Achievement Transformation Guidance Special Project (202104021301052), the National Natural Science Foundation of China (22169017) and sponsored by Mettler Toledo and Taiyuan Green Coke Energy Co., Ltd. (China).

More Information

Corresponding author: E-mail: 13303460889@163.com; yangsong@tyut.edu.cn

摘要

摘要: 由于低阶煤缺乏黏结性，在工业型焦生产中的应用十分有限。为了利用低阶粉煤代替块煤作为原料生产清洁燃料，本研究采用洗油渣（WOR）作为黏结剂以增强其结构强度，并研究了黏结剂添加量和碳化温度对焦炭强度的影响。当碳化温度为800 °C，WOR与低阶煤的质量比为3∶7时，焦炭的抗压强度最好，M₂₅达到97%。而煤热解固相产物的SEM分析表明WOR的热塑性是导致焦炭强度升高的主因，且黏结机理可总结为：热塑性的WOR在升温过程中软化熔融，包覆在煤颗粒表面且形成煤-黏结剂界面，将原本松散的惰性煤颗粒结合在一起，进而显著提高了焦炭强度。
- 低阶煤 /
- 洗油渣 /
- 炭化 /
- 黏结机理
Abstract: Low-rank coal is rarely used in the industry of carbonized briquette due to its poor cohesiveness. In order to replace lump coal and utilize low-rank pulverized coal as much as possible in a carbonized briquette process, washing oil residue (WOR) was used as an enhanced binder to enhance the bonding strength of resulted carbonized briquette. The effects of blending ratio and carbonization temperatures on binding strength were investigated, and moreover, a reasonable bonding mechanism was deduced. The results showed that the best crushing strength was obtained when the weight ratio of WOR and low-rank coal is 3∶7 at 800 °C, and its crushing strength of M₂₅ (M₂₅) can reach to 97%, while the thermoplastic properties of WOR is thought to be responsible for the obtained good crushing strength, where WOR can be softened and coated on the surface of coal particles during carbonization, and then a coal-binder interface can be formed, resulting in the loose inert coal particles can be combined and the strength of coke is improved significantly.
- low-rank coal /
- washing oil residue /
- carbonization /
- bonding mechanism

HTML全文

FIG. 2022. FIG. 2022.

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Figure 1 Scheme of coke preparation process

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Figure 2 Schematic diagram of the experimental for briquette pyrolysis

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Figure 3 Homemade coke drum machine

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Figure 4 Effect of WOR content on drum strength

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Figure 5 Effect of different fraction of WOR binder on the caking properties of coke

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Figure 6 Effect of carbonization temperature on drum strength

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Figure 7 SEM images of coke at different carbonization temperatures

(a): coke₃₀₀; (b): coke₄₀₀; (c): coke₅₀₀; (d): coke₆₀₀; (e): coke₇₀₀; (f): coke₈₀₀; (g): coke₉₀₀; (h): coke₁₀₅₀

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Figure 8 FT-IR spectra of coke produced at different temperatures

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Figure 9 XRD patterns of coke produced at different temperatures

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Figure 10 Colloidal layer index of coke (SXC: WOR=7:3)

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Figure 11 SEM images of SXC at different carbonization temperatures

(a): C-300; (b): C-400; (c): C-500; (d): C-800

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Figure 12 SEM images of WOR at different carbonization temperatures

(a): W-300; (b): W-400; (c): W-500; (d): W-800

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Figure 13 Schematic of the bonding mechanism of WOR and low-rank coal during carbonization

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Table 1 Proximate and ultimate analyses of the coal sample and WOR

Sample	Ultimate analysis w_daf/%					Proximate analysis w/%
Sample	C	H	N	S	O^a	M_ad	A_d	V_daf	G
SXC	80.64	4.95	1.17	0.48	12.76	3.19	6.41	37.46	0
WOR	73.91	3.87	0.75	1.86	19.61	0.29	17.77	41.27	90
^a: by difference

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