基于当量抽汽压力的大型热电联产供热模式研究

发布时间：2018-06-26 13:18

本文选题：热电联产 + 供热模式　；参考：《动力工程学报》2014年07期

【摘要】：建立了大型热电联产机组变工况分析模型,揭示出不同热网回水温度和热网回水温升条件下,单效溴化锂吸收式热泵驱动热源饱和蒸汽压力和热力系数的变化规律.提出2种不同供热模式选取的判据,即当量抽汽压力.以某300MW直接空冷抽凝供热机组为例,进行了变工况计算及分析.结果表明:随热网回水温升的增大以及热网回水温度的升高,驱动热源饱和蒸汽压力升高,而吸收式热泵热力系数则减小;对于300MW等级及以上供热改造机组,由于汽轮机中低压缸抽汽压力高于对应的当量抽汽压力,采用吸收式热泵供热模式更节能.
[Abstract]:In this paper, an analysis model of variable working conditions for large heat and power cogeneration units is established. The variation of saturated steam pressure and thermal coefficient of heat source driven by single-effect libr absorption heat pump is revealed under the conditions of different backwater temperature of heat network and temperature rise of backwater of heat network. Two criteria for the selection of different heating modes, I. e., equivalent extraction pressure, are proposed. Taking a 300 MW direct air cooling condensate heating unit as an example, the calculation and analysis of variable working conditions are carried out. The results show that the saturated steam pressure of driving heat source increases and the thermodynamic coefficient of absorption heat pump decreases with the increase of backwater temperature and backwater temperature. Because the extraction pressure of the medium and low pressure cylinder of steam turbine is higher than the equivalent extraction pressure of steam turbine, it is more energy saving to adopt the absorption heat pump heating mode.
【作者单位】：华北电力大学能源动力与机械工程学院;
【基金】：国家自然科学基金联合基金资助项目(U1261210,U1361108)
【分类号】：TM621.4

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