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首页> 外文期刊>Energy Conversion & Management >Enhancing the overall efficiency of a lignite-fired oxyfuel power plant with CFB boiler and membrane-based air separation unit
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Enhancing the overall efficiency of a lignite-fired oxyfuel power plant with CFB boiler and membrane-based air separation unit

机译：配备CFB锅炉和膜式空气分离装置的褐煤制氧燃料电厂的整体效率提高

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摘要

The power plant analyzed in this paper consists of the following systems: a steam turbine, a supercritical OXY-type circulating fluidized bed boiler fed with lignite characterized by a high moisture content (42.5%), and an air separation unit based on a 3-end type high temperature membrane and CO_2 compression installation. The steam turbine gross power is equal to 600 MW, and both the live and reheated steam parameters are equal to 600 ℃/29 MPa and 620 ℃/5 MPa, respectively. With the assumed constant gross power of the analyzed plant, the thermal efficiency of the boiler and the power requirements of the equipment used in the above mentioned installations were calculated. These values and also the net efficiency of the analyzed plant were determined as a function of the oxygen recovery rate in the membrane (R). The net efficiency is lower by 7.26 percentage points in comparison with the reference system. The basic method to reduce the loss of net efficiency is to introduce an integrated system, both with a boiler and an ASU installation lignite drying system. This allowed for the reduction of the loss of net efficiency of up to 3.9 percentage points for the lignite dried to w = 20% and 3.3 percentage points at w = 10%. Increase in the intensity of the drying of the lignite not only causes an increase in the maximum system efficiency but also reduces the required membrane surface. A further reduction in the loss of efficiency is sought in the thermal integration of all installations with a steam turbine. This procedure which may improve efficiency by approximately 0.4 percentage point is intended to allow the closure of extractions in the steam turbine and an increase in turbine power.
机译：本文分析的发电厂由以下系统组成：蒸汽轮机，装有褐煤的高临界OXY型循环流化床锅炉，褐煤的水分含量高（42.5％），其空气分离装置基于3-末端型高温膜和CO_2压缩装置。汽轮机总功率等于600 MW，新鲜蒸汽和再加热蒸汽参数分别等于600℃/ 29 MPa和620℃/ 5 MPa。在假定分析工厂的总功率恒定的情况下，计算了锅炉的热效率和上述安装所用设备的功率要求。确定这些值以及所分析植物的净效率，作为膜（R）中氧气回收率的函数。与参考系统相比，净效率降低了7.26个百分点。减少净效率损失的基本方法是引入一个集成系统，该系统同时具有锅炉和ASU安装的褐煤干燥系统。对于干燥至w ＝ 20％的褐煤和w ＝ 10％的3.3％，褐煤的净效率损失最多降低了3.9个百分点。褐煤干燥强度的增加不仅导致最大系统效率的提高，而且减小了所需的膜表面。在所有设备与蒸汽轮机的热集成中寻求进一步降低效率的损失。该程序可以将效率提高大约0.4个百分点，旨在允许关闭蒸汽轮机中的抽气并增加涡轮机功率。

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  • 来源
    《Energy Conversion & Management》 |2014年第4期|20-31|共12页
  • 作者

    Janusz Kotowicz; Adrian Balicki;

  • 作者单位

    Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland;

    Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oxyfuel; Air separation unit; Clean coal; Membrane; CFB boiler;

    机译：含氧燃料;空分装置清洁煤;膜;CFB锅炉;

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