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Densification of coal fines and mildly torrefied biomass into composite fuel using different organic binders

机译：使用不同的有机粘合剂将煤粉和轻度焙烧的生物质致密化为复合燃料

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Coal processing industries generate millions of tons of fines (<3 mm) during mining operation and are often considered as wastes. These wastes have enormous potential in serving as energy and metallurgical operation feedstock. One avenue for its use is densification into briquettes or pelletizes. Various briquetting techniques have been adopted in the past few decades; however, the main issues upfront in commercializing these techniques are significant binder cost and poor mechanical integrity. Therefore, the present study concentrates on utilizing commonly available organic binder along with pretreated biomass in developing coal fine briquettes. Briquettes were produced after initial pretreatment of the raw materials under a load of 2 tons. Briquettes were cured in an inert environment and eventually characterized for its main litmus requirements (physical properties). It was observed that pitch-molasses bonded briquettes have better physical properties leading to good mechanical integrity than briquettes produced from individual binder. The proximate, ultimate and calorific value analyses of the briquettes do not deteriorate but mildly improved compared to the raw coal fines. With a density of 1.18–1.32 g/cm3, drop to fracture that is greater than 100 (times/2 m), impact resistance index well above 6000, water resistance index of 99% and cold crushing strength of 9 MPa, pitch-molasses bonded briquettes clearly surpassed recommended physical properties benchmarked for briquettes of industrial and domestic end use. The physical properties of the briquettes favorably meet requirements as feedstock for rotary kiln direct reduced iron and COREX iron-making processes as well as fuel for thermal operations.
机译：煤炭加工行业在采矿过程中会产生数百万吨的细粉（<3毫米），通常被视为废物。这些废物在用作能源和冶金操作原料方面具有巨大潜力。其使用的一种途径是致密化成团块或颗粒。在过去的几十年中，已经采用了各种压块技术。然而，将这些技术商业化的主要问题是粘合剂成本高和机械完整性差。因此，本研究集中于在开发煤细煤饼中利用通常可利用的有机粘合剂以及经过预处理的生物质。在对原料进行初步预处理后，以2吨的负荷生产出团块。型煤在惰性环境中固化，并最终以其主要石蕊需求（物理性质）为特征。据观察，与由单独的粘合剂生产的团块相比，沥青-糖蜜粘结的团块具有更好的物理性能，导致良好的机械完整性。与原煤粉相比，煤球的近期，极限和热值分析均不会降低，但会有所改善。密度为1.18–1.32 g / cm 3 ，跌落断裂大于100（次/ 2 m），耐冲击指数远高于6000，耐水指数为99％，冷压碎沥青糖蜜粘结团块的强度达到9 MPa，明显超过了推荐用于工业和家庭最终用途团块的推荐物理性能。压块的物理性能可以很好地满足作为回转窑直接还原铁和COREX炼铁工艺原料以及热力操作燃料的要求。

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