40
doi:10.3969/j. issn.1009 3230.2013.08.010
应用能源技术
2013年第8期（总第188期）
电站加热器抽汽压损对机组煤耗率的影响
贾云栋
（张家口发电厂河北张家口075133）
摘要：电站加热器的运行状态对机组的煤耗率有着重要影响，这体现在加热器上端差、下端差和抽气压损等方面。以某厂300MW火电机组凝汽式汽轮机热力系统为例，结合抽汽压损与机组煤耗率之间的计算模型，得出加热器抽汽压损与煤耗率之间的具体关系，并绘制成曲线。分析影响机组热经济性的抽汽压损强度系数，得出抽汽压损强度系数、煤耗率和负荷之间的关系。给出机组运行中需重点监测的对象，为机组的最优运行、改造工作莫定理论基础。
关键词：抽汽压损；电站；热力系统；煤耗率
中图分类号：TK262
文献标志码：A
文章编号：1009-3230(2013)08-004004
Analysis ofInfluenceonHeaterSteamExtractionpressureLoss
toCoalConsumptionRate
Suop-unIf
（ZhangjiakouPowerPlant，Zhangjiakou075133，China）
Abstract:The running state of the heater of power plant has important influence on coal consumption rate of unit, this reflects on terminal temperature difference, extraction pressure loss, etc. Taking 300MW condensing steam turbine unit's typical conditions for an example, combined coal -consuming rate with the extraction steam pressure loss, the specific relationship between the heater extraction steam pressure loss and coal consumption rate is found out, a curve is gain between them. The influence intensity of the thermal efficiency steam and pressure loss is analyzed, and the relationship between the coal consumption rate, extraction steam pressure loss and thermal efficiency is work out. The operation of the unit which should be key monitoring is given in. This paper has laid a theoretical basis, the optimal operation of unit, the transformation work.
Key words: Extraction steam pressure loss; Power plant; Heating system; Coal consumption rate
0引言
在电站热力系统中，加热器各段抽汽压损影响着蒸汽的做功能力，进而对电站的热经济性产生一定影响。加热器的抽汽压损一般指汽轮机一级抽汽口到加热器之间的管道压损和加热器内部压损之和。文中以某厂300MW火电机组凝汽式汽轮机热力系统为例，结合抽汽压损对机组煤耗
收稿日期：2013-06-17
修订日期：20130710
作者简介：贾云栋，工程师，张家口发电厂。万方数据
率影响的小扰动理论，推导分析机组煤耗率的通用方程，得出了8台加热器的抽汽压损与煤耗率之间的具体关系并绘制成曲线(1-6)。给出了机组运行中需重点监测的对象，为机组的最优运行、改造工作奠定了理论基础。本文分析方法亦可为其它机组的加热器抽汽压损问题的求解提供参考。 1300MW机组热力系统概况
某电厂采用东汽的N300-16.7/537/537单轴、凝汽式汽轮机，三缸两排汽、一次中间再热。回热系统由3台高加、4台低加和1台除氧器组