1000MW超超临界空冷火电机组低温省煤器系统设计优化
发布时间：2018-09-11 18:45
【摘要】：本文简要介绍了国内火电机组中常见的三种低温省煤器设备,归纳了低温省煤器应用于火电机组的常见系统型式及特点,总结了影响火电机组低温省煤器系统设计的主要因素。本文以山西神头电厂1000MW超超临界空冷火电机组为例,设计了四个低温省煤器加热凝结水的系统方案。计算及分析结果显示,方案四的系统热效率高于其它三个较常规的方案。方案四中,作者按照热能分级利用的思路和系统安全可靠的原则,将两级低温省煤器以串联方式布置在脱硫吸收塔入口的烟道上,处在高温烟气段的低温省煤器A,用来加热高温段的凝结水；处在低温烟气段的低温省煤器B,用来加热低温段的凝结水。同时,由于方案四的两级低温省煤器都处在除尘器的下游,所以低温省煤器换热管束可以避免高粉尘浓度烟气的冲刷磨损,设备使用寿命及安全性大幅提高。本文提出的低温省煤器系统优化方案对山西神头电厂1000MW超超临界空冷火电机组和类似条件的火电机组都有较高的实用价值,本文总结的低温省煤器系统在1000MW超超临界空冷机组上工程应用的设计要点,也对同类型机组的工程设计有重要的指导意义。
[Abstract]:This paper briefly introduces three kinds of low temperature economizer equipment in domestic thermal power unit, summarizes the common system types and characteristics of low temperature economizer used in thermal power unit, and summarizes the main factors influencing the design of low temperature economizer system of thermal power unit. Taking the 1000MW ultra-supercritical air-cooled thermal power unit in Shentou Power Plant as an example, four low-temperature economizers for heating condensate water are designed in this paper. The results of calculation and analysis show that the system thermal efficiency of the fourth scheme is higher than that of the other three schemes. In the fourth scheme, according to the idea of grading utilization of heat energy and the principle of safety and reliability of the system, the two-stage low temperature economizer is arranged in series on the flue at the entrance of the desulfurization absorption tower. Low temperature economizer A is used to heat condensate water in high temperature section and low temperature economizer B is used to heat condensate water in low temperature section. At the same time, because the two-stage cryogenic economizer of scheme four is downstream of the dust collector, the tube bundle of the low-temperature economizer can avoid the erosion and wear of the smoke with high dust concentration, and the service life and safety of the equipment are greatly improved. The system optimization scheme of low temperature economizer proposed in this paper is of high practical value for 1000MW supercritical air-cooled thermal power units and similar thermal power units in Shentou Power Plant of Shanxi Province. The main points of engineering application of cryogenic economizer system in 1000MW ultra-supercritical air cooling unit are summarized in this paper. It is also of great significance to the engineering design of the same type units.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
本文编号：2237553
[Abstract]:This paper briefly introduces three kinds of low temperature economizer equipment in domestic thermal power unit, summarizes the common system types and characteristics of low temperature economizer used in thermal power unit, and summarizes the main factors influencing the design of low temperature economizer system of thermal power unit. Taking the 1000MW ultra-supercritical air-cooled thermal power unit in Shentou Power Plant as an example, four low-temperature economizers for heating condensate water are designed in this paper. The results of calculation and analysis show that the system thermal efficiency of the fourth scheme is higher than that of the other three schemes. In the fourth scheme, according to the idea of grading utilization of heat energy and the principle of safety and reliability of the system, the two-stage low temperature economizer is arranged in series on the flue at the entrance of the desulfurization absorption tower. Low temperature economizer A is used to heat condensate water in high temperature section and low temperature economizer B is used to heat condensate water in low temperature section. At the same time, because the two-stage cryogenic economizer of scheme four is downstream of the dust collector, the tube bundle of the low-temperature economizer can avoid the erosion and wear of the smoke with high dust concentration, and the service life and safety of the equipment are greatly improved. The system optimization scheme of low temperature economizer proposed in this paper is of high practical value for 1000MW supercritical air-cooled thermal power units and similar thermal power units in Shentou Power Plant of Shanxi Province. The main points of engineering application of cryogenic economizer system in 1000MW ultra-supercritical air cooling unit are summarized in this paper. It is also of great significance to the engineering design of the same type units.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
【共引文献】
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1 吴金星;许思龙;邓洪生;;火力发电厂低温烟气余热利用研究[A];2014年江西省电机工程学会年会论文集[C];2014年
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1 刘智飞;660MW超临界机组锅炉主辅设备选型及分析[D];华北电力大学;2014年
，本文编号：2237553
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