利用抽汽蓄能提高机组调频能力的定量分析  

Quantitative Analysis of the Enhancement in the Frequency Modulation Ability of a Unit by Utilizing the Steam Extraction and Energy Storage

作　　者：张锐锋 练海晴 田亮[3] 

机构地区：[1]贵州电力试验研究院,贵州贵阳550002 [2]国网新疆电力公司昌吉供电公司,新疆昌吉831100 [3]华北电力大学控制与计算机工程学院,河北保定071003

出　　处：《热能动力工程》2016年第7期62-67,134-135,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB215203);中央高校基本科研业务费专项资金资助(2014MS145)

摘　　要：合理利用凝结水系统蓄能能够提高机组发电负荷响应速率,定量分析其蓄能容量对优化控制系统设计及保证机组安全运行意义重大。依据质量、能量守恒定律,结合等效焓降法计算凝结水流量变化与各加热器抽汽流量、比焓以及汽轮机功率变化之间的对应关系,再依据除氧器容积计算得到蓄能总量。600 MW、1 000 MW典型机组的计算结果表明:该方法具有较高的准确度;同一机组凝结水系统蓄能容量随负荷增加而增加;运行参数越高的机组凝结水系统的蓄能容量越大。To rationally utilize the energy storage capacity of a condensate water system is capable of enhancing the response speed of a unit in power generation load and to quantitatively analyze its energy storage capacity is of major importance for optimally designing a control system and ensuring a safe operation of the unit. According to the mass and energy conservation law and in combination with the equivalent enthalpy drop method,the correlation of changes in condensate water flow rate with the steam extraction flow rates to various heaters,specific enthalpy and changes in the power of the steam turbine was calculated. Afterwards,according to the volume of the deaerator,the total amount of energy stored was calculated. The calculation results of a 600 MW and 1000 MW typical unit show that the method in question enjoys a relatively high precision. The energy storage capacity of the condensate water system in a same unit will increase with an increase of the load. The higher the operating parameters of a unit,the larger the energy storage capacity of its condensate water system.

关 键 词：火电机组 凝结水系统 蓄能容量 负荷调节 焓降 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]