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首页> 外文期刊>Journal of Energy Resources Technology >Exergy Analysis of Heat Recovery Steam Generator: Effects of Supplementary Firing and Desuperheater
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Exergy Analysis of Heat Recovery Steam Generator: Effects of Supplementary Firing and Desuperheater

机译：余热锅炉的火用分析：辅助点火和减温器的作用

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摘要

Comprehensive exergy analysis of a heat recovery steam generator (HRSG) with two levels of delivered pressure is presented. The effects of supplementary firing as well as desuperheater set-point are considered to evaluate the exergy destruction of HRSG components. Burner firing rate is limited to a value that corresponds to the maximum allowable temperature of tube metal of high-pressure (HP) superheater. According to the exergy analysis performed in the current study, the exergy efficiency of HRSG is about 80% which means 20% of flue gas exergy (entering HRSG) is dissipated by HRSG destruction (～14%) and stack exergy loss (～6%). The stack exergy loss drops continuously as supplementary firing raises. It has also been determined that increasing the rate of supplementary firing boosts the exergy efficiency in the absence of water spray and reduces it when desuperheater is working. In addition, the exergy delivered to steam turbine shows a linear growth with burner heat while it is hardly affected by the set-point of desuperheater. Also, it is found that exergy loss through the stack is not sensitive to desuperheater set-point while it is on the decrease as burner duty raises. HP steam flow will raise with increasing the firing and/ or decreasing the desuperheater set-point. HP evaporator has the most contribution in exergy destruction among HRSG components (～40%), whereas HP superheater and desuperheater are components with a maximum sensitivity of exergy destruction to the amount of water spray.
机译：提出了具有两个输送压力水平的热回收蒸汽发生器（HRSG）的综合火用分析。考虑了辅助点火以及减温器设定点的影响，以评估HRSG组件的火用破坏。燃烧器的燃烧速率限制为与高压（HP）过热器管金属的最高允许温度相对应的值。根据当前研究的火用分析，HRSG的火用效率约为80％，这意味着20％的烟气火用（进入HRSG）被HRSG破坏（〜14％）和烟囱火用损失（〜6％）消散了。 ）。随着辅助点火的增加，烟囱的火用损失不断降低。还已经确定，在没有喷水的情况下，增加辅助燃烧的速率可以提高火用效率，而当减温器工作时，则可以降低火用效率。此外，输送到蒸汽轮机的火用热量随着燃烧器的热量呈线性增长，而几乎不受减温器设定值的影响。同样，发现通过烟囱的火用损失对减温器设定点不敏感，而随着燃烧器负荷的增加，减量设定点正在降低。高压蒸汽流量将随着燃烧次数的增加和/或减温器设定值的降低而增加。在HRSG组件中，HP蒸发器对火用破坏的贡献最大（约40％），而HP过热器和减温器是对火药破坏量对喷水量具有最大敏感性的组件。

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