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Evaluation and optimization of preparation for semi-coke briquette with alkali-heat treated wheat straw binder
International Journal of Coal Preparation and Utilization ( IF 2.0 ) Pub Date : 2020-12-27 , DOI: 10.1080/19392699.2020.1841176
Maobo Yuan 1 , Chang’An Wang 1 , Lin Zhao 1 , Zhengrong Zhu 1 , Pengqian Wang 1 , Chaowei Wang 1 , Defu Che 1
Affiliation  

ABSTRACT

Semi-coke briquette used in stoves could reduce the primary PM2.5 emission and lower the material cost advantages. While the manufacturing cost of semi-coke briquette is relatively high due to the weak cohesiveness of semi-coke. The cost-effective and environment-friendly briquetting technology still needs to be developed for clean utilization of fine semi-coke. A novel preparation method of semi-coke briquette with alkali-heat-treated wheat straw (AH-WS) binder was put forward in this study. The physical characteristics of the semi-coke briquette were analyzed experimentally. Infrared spectroscopies indicated that AH-WS obtained in the mixed lye comprised 4% Ca(OH)2 and 0.04% NaOH featured higher cellulose and O-H group concentrations than those in 4% Ca(OH)2. Therefore, the mixed lye could play a better role in briquette binding. Scanning electron microscope images revealed that higher AH-WS ratio enlarged the area of solid bridges during densification and improved the strength and density of briquette. The orthogonal analysis determined the optimum briquetting parameters were 8% moisture, 25% AH-WS, 5% clay and as low as 15 MPa forming pressure, which could obtain the semi-coke briquette with compressive strength above 20 MPa and bomb calorific value beyond 19 MJ/kg. Present work could promote the application of semi-coke briquette for household.



中文翻译:

碱热处理麦秸粘结剂制备半焦型煤的评价与优化

摘要

用于炉灶的半焦型煤可以减少初级PM 2.5排放并降低材料成本优势。而半焦型煤的制造成本相对较高,因为半焦的内聚力较弱。精细半焦的清洁利用仍需开发经济高效、环保的压块技术。本研究提出了一种以碱热处理麦秸(AH-WS)为粘合剂制备半焦型煤的新方法。对半焦型煤的物理特性进行了实验分析。红外光谱表明,在混合碱液中获得的AH-WS由4% Ca(OH) 2和0.04% NaOH组成,其纤维素和OH基浓度高于4% Ca(OH) 2. 因此,混合碱液在型煤粘合中可以发挥更好的作用。扫描电镜图像显示,较高的 AH-WS 比增大了致密化过程中的固体桥面积,并提高了型煤的强度和密度。正交分析确定最佳成型参数为水分8%、AH-WS25%、粘土5%,成型压力低至15 MPa,可获得抗压强度20 MPa以上、弹热值超过19 兆焦耳/公斤。目前的工作可以促进半焦型煤在家庭中的应用。

更新日期:2020-12-27
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