基于煤质特性的炼焦煤配洗研究

    Research on Blending Washing of Coking Raw Coal Based on Coal Quality Characteristics

    • 摘要: 基于不同煤炭资源煤质特点进行精细化配煤洗选,是煤炭企业实现资源整合、降本增效的有效手段。为了探究不同配比对精煤主要指标的影响,对大同市左云地区铺龙湾原煤试样(PLW)和其周边3个矿井的原煤试样(BJZ、HJW、KQ)进行全级浮沉,分析4种原煤的可选性;通过工业分析以及可选性解析单种煤及精煤基本煤质特性,根据煤质特性及其分选特性设计PLW配洗BJZ,HJW,KQ的二元及三元配洗方案,对不同配比的原煤进行三级浮沉,对比 < 1.4 g/cm3密度级精煤产率、灰分、硫分、黏结指数等主要指标,优选出PLW原煤配洗的最佳比例。结果表明:PLW原煤和BJZ原煤中含有较高的矿物质和矸石,精煤产率相对较低,而KQ原煤和HJW原煤的精煤产率相对较高;利用煤质特性,将产率偏低的PLW原煤分别与其他三种原煤进行二元及三元配洗,以达到精煤灰分 < 9%、硫分 < 0.8%及黏结指数相对较好的煤质特性。在方案制定的配比范围内,二元配洗方案中,以PLW和KQ原煤配煤比例为4∶6时精煤产率最高,为35.12%,精煤灰分为6.21%、硫分为0.75%、黏结指数为73,均满足预期配洗指标要求,效果较好;三元配洗方案中,以PLW,HJW,BJZ原煤配煤比例为4∶3∶3时精煤产率最高,为32.00%,精煤灰分为8.10%、硫分为0.73%,也满足预期配洗指标要求。基于单种煤煤质特性,通过配煤入洗,可弥补铺龙湾煤的内灰偏高、精煤产率低等不足,为后续选煤厂配洗提供有力依据和应用指导,从而提高选煤厂经济效益并合理利用煤炭资源。

       

      Abstract: Fine - grained coal blending and washing based on the coal quality characteristics of different coal resources is an effective means for coal enterprises to achieve resource integration and cost-effective operations. In order to investigate the influence of different proportions on the main indexes of clean coal, the complete float-sink analysis is carried out on raw coal samples from Pulongwan in Zuoyun District, Datong City (PLW) and from three surrounding mines (BJZ, HJW, KQ) to analyze the washability of the four raw coals. The basic coal quality characteristics of single coal and clean coal are analyzed through proximate analysis and washability tests. Three-stage float-sink tests are conducted on raw coal with different blending ratios. Key indicators such as the yield, ash content, sulfur content, and caking index of clean coal in the density fraction < 1.4 g/cm3 are compared to determine the optimal blending ratio for PLW raw coal. The results show that PLW and BJZ raw coals contain relatively high levels of minerals and gangue, resulting in lower clean coal yields. In contrast, KQ and HJW raw coals exhibit higher clean coal yields. Leveraging the coal quality characteristics, binary and ternary blending of PLW raw coal (with relatively low yield) with the other three raw coals is carried out to achieve clean coal with an ash content < 9%, sulfur content < 0.8%, and relatively favorable caking index. Within the blending ratio range specified in the plan: in the binary blending scheme, the highest clean coal yield is achieved when the blending ratio of PLW and KQ raw coal is 4∶6, reaching 35.12%. The ash content of clean coal is 6.21%, the sulfur content is 0.75%, and the caking index is 73, all meeting the expected blending washing index requirements, with a good effect. In the ternary blending scheme, the highest clean coal yield is achieved when the blending ratio of PLW, HJW, and BJZ raw coal is 4∶3∶3, reaching 32.00%. The ash content of clean coal is 8.10%, and the sulfur content is 0.73%, also meeting requirements. Based on the coal quality characteristics of single coals, blending and washing can compensate for the shortcomings of Pulongwan coal, such as high internal ash and low clean coal yield. This provides a strong basis and application guidance for subsequent coal blending and washing in coal preparation plants, thereby improving the economic benefits of coal preparation plants and rationalizing the utilization of coal resources.

       

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