ABSTRACT

Lignite plays a dominant role for energy production in Greece, covering over 30% of the demand for electricity generation. Increased energy demand requires, additionally to alternative energy sources, an increase in energy supply from both old and new deposits. Due to the low quality of mined lignite, methods of upgrading in terms of power plants’ efficiency and environmental performance need to be applied. In this work, the technique of Selective Size Reduction (SSR) was investigated for three deposits in North Greece, Amynteon, S. Field and Ahlada, in order to improve lignite quality through reduction of its mineral matter content. The variation of the qualitative characteristics of the grain fractions produced by SSR provided useful information on both the suitability of these fractions for combustion in the power plants of the area and the emissions of greenhouse gases. The results have shown that fractions, which were produced from the first stage of crushing, with recovery between 83% and 95%, had lower ash by 16.5–27% than the raw material and were of acceptable quality for combustion in the power plants of the area. Beneficiated fractions could give energy efficiency between 34% and 36% and a reduction in CO₂ emissions up to 29%, originated from the decomposition of the carbonate minerals, contained in the mined lignite. As a result, the cost for buying CO₂ certificates could be lowered up to 3€/MWh.

摘要

褐煤在希腊的能源生产中发挥着主导作用，占发电需求的 30% 以上。除了替代能源之外，能源需求的增加还需要增加新旧矿床的能源供应。由于开采的褐煤质量低，需要采用电厂效率和环境性能方面的升级方法。在这项工作中，针对希腊北部 Amynteon、S. Field 和 Ahlada 的三个矿床研究了选择性减小尺寸 (SSR) 技术，以通过降低褐煤的矿物质含量来提高褐煤质量。SSR 生产的谷物部分的质量特征的变化为这些部分在该地区的发电厂燃烧的适用性和温室气体的排放提供了有用的信息。结果表明，从破碎的第一阶段产生的馏分，回收率在 83% 到 95% 之间，灰分比原材料低 16.5% 到 27%，并且在发电厂的燃烧中具有可接受的质量。该地区。精选馏分可提供 34% 至 36% 的能源效率并减少二氧化碳排放 比原材料低 5-27%，并且在该地区的发电厂中燃烧质量可以接受。精选馏分可提供 34% 至 36% 的能源效率并减少二氧化碳排放 比原材料低 5-27%，并且在该地区的发电厂中燃烧质量可以接受。精选馏分可提供 34% 至 36% 的能源效率并减少二氧化碳排放₂排放量高达 29%，源自开采的褐煤中所含的碳酸盐矿物的分解。因此，购买 CO ₂证书的成本可降低至 3 欧元/兆瓦时。