黏结剂对长焰煤制备民用洁净焦炭强度的影响

doi:10.16085/j.issn.1000-6613.2020-1054

化工进展 ›› 2021, Vol. 40 ›› Issue (4): 2145-2151.DOI: 10.16085/j.issn.1000-6613.2020-1054

黏结剂对长焰煤制备民用洁净焦炭强度的影响

刘守军¹^,²^,³(), 演康¹^,³, 常志伟²^,³, 白亚东¹^,³(), 杨颂¹^,³, 杜文广²^,³, 王钊¹^,³, 刘月华²^,³

^1.太原理工大学化学化工学院，山西太原 030024
^2.太原理工大学煤科学与技术教育部和山西省重点实验室，山西太原 030024
^3.山西省民用洁净焦炭工程研究中心，山西太原 030024

收稿日期:2020-06-11 出版日期:2021-04-05 发布日期:2021-04-14
通讯作者: 白亚东
作者简介:刘守军（1963－），男，副教授，研究方向为洁净煤技术。E-mail：13303460889@163.com。
基金资助:
国家自然科学基金(21878210);山西省高等学校科技创新项目(2019L0313);太原理工大学2020年校级教学改革创新项目(89);山西省专利推广实施资助计划(20200719)

Effect of binder on the strength of long-flame coal for civil clean coke

LIU Shoujun¹^,²^,³(), YAN Kang¹^,³, CHANG Zhiwei²^,³, BAI Yadong¹^,³(), YANG Song¹^,³, DU Wenguang²^,³, WANG Zhao¹^,³, LIU Yuehua²^,³

^1.College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
^2.Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
^3.Shanxi Engineering Center of Civil Clean Tuel, Taiyuan 030024, Shanxi, China

Received:2020-06-11 Online:2021-04-05 Published:2021-04-14
Contact: BAI Yadong

摘要/Abstract

摘要：

在我国广大农村地区，居民仍使用劣质散烧原煤，严重破坏了大气环境。提供优质的煤基洁净燃料是从源头上解决劣质煤散烧所带来环境问题的重要手段之一。但由于传统民用炉具为层燃式，对所用燃料具有强度和块度的要求。因此，如何保证燃料的成型与强度是一个关键问题。基于此，本文以长焰煤为原料，与复合助剂先经冷压成型，再通过热解制备得到洁净焦炭。同时，系统地研究了复合黏结剂添加量、热解温度等对洁净焦炭强度的影响。结果表明：加入1%聚乙烯醇（PVA）、30%洗油渣（WOR），在800℃下可得到抗碎强度为94.7%的洁净焦炭，可满足相应的强度要求。复合添加剂中的PVA为冷态黏结剂，其遇水会在煤粒间形成高黏性网状胶体，促使煤颗粒之间黏结，保证其冷态强度。而WOR为热态黏结剂，其在高温热解过程将转化为高黏结性的类胶质体，将原本松散的、无黏结性的惰性颗粒黏结，最终形成高强度的民用洁净焦炭。该研究对高强度民用洁净焦炭的制备提供理论指导。

关键词: 黏结剂, 聚乙烯醇, 洗油渣, 洁净焦炭, 黏结机理

Abstract:

Raw coal is still used in the vast rural areas of China, which seriously pollutes the atmospheric environment. Providing high-quality coal-based clean fuel is one of the important means to solve the environmental problems caused by low-quality coal burning at the source. However, the traditional civilian stoves are layer-fired, so the fuel used has the requirements of strength and lumpiness. Therefore, how to guarantee the forming and strength of fuel is a key problem. Based on this, in this paper, long-flame coal and the composite auxiliary agent are firstly cold-pressed, and then pyrolyzed to prepare the clean coke. At the same time, the effects of the amount of compound binder and pyrolysis temperature on the strength of clean coke are studied. The results show that by adding 1% polyvinyl alcohol (PVA) and 30% washing oil residue (WOR), and keeping the carbonization temperature at 800℃, civil clean coke with a crushing strength M₂₅ of 94.7% can be obtained, which fully meets the strength requirements of civil clean coke. The PVA in the composite additive is a cold binder and forms a high viscosity reticular colloid between coal particles when it meets water, which promotes the adhesion between coal particles and ensures its cold strength. The WOR is a hot binder, which is converted into a colloidal substance with high adhesion in the high-temperature pyrolysis process. The originally loose and non-adhesive inert particles are bonded to form a high strength civil clean coke. The research provides theoretical guidance for the preparation of high strength civil clean coke.

Key words: binder, PVA, washing oil residue, civil clean coke, bonding mechanism

中图分类号:

TQ53

刘守军, 演康, 常志伟, 白亚东, 杨颂, 杜文广, 王钊, 刘月华. 黏结剂对长焰煤制备民用洁净焦炭强度的影响[J]. 化工进展, 2021, 40(4): 2145-2151.

LIU Shoujun, YAN Kang, CHANG Zhiwei, BAI Yadong, YANG Song, DU Wenguang, WANG Zhao, LIU Yuehua. Effect of binder on the strength of long-flame coal for civil clean coke[J]. Chemical Industry and Engineering Progress, 2021, 40(4): 2145-2151.

图/表 12

表1 煤和洗油渣的元素分析和工业分析

样品	元素分析/%					工业分析/%				G
样品	C_daf	H_daf	N_daf	S_daf	O_daf^①	M_ad	A_ad	V_daf	FC_ad	G
长焰煤	80.64	4.95	1.17	0.48	12.76	3.19	6.41	37.46	56.54	0
洗油渣	73.91	3.87	0.75	1.86	19.61	0.29	17.77	41.27	48.1	90

图1 洁净焦炭制备流程示意图

图2 PVA含量对洁净型煤抗压强度的影响

图3 WOR含量对洁净型煤强度的影响

图4 不同种类型煤的扫描电镜图

图5 不同种类型煤的FTIR图

图6 不同类型型煤的最小接触角图

图7 WOR含量对洁净焦炭抗碎强度的影响

图8 不同热解温度对洁净焦炭转鼓强度的影响

图9 洁净焦炭在不同热解温度下的SEM图

图10 洁净焦炭的胶质层指数

图11 复合黏结剂的黏结机理图

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黏结剂对长焰煤制备民用洁净焦炭强度的影响

Effect of binder on the strength of long-flame coal for civil clean coke

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