摘要
冷端系统作为火电机组的重要辅助系统,其设备运行状态对机组的经济性和安全性有重要影响。凝汽器压力在一定条件下可以认为是汽轮机背压,背压变化对机组的功率有很大的影响。在分析凝汽器和冷却塔工作原理的基础上,建立凝汽器背压计算模型,探究循环水流量的连续调节对机组背压及功率的影响规律。结果表明,通过调节冷端系统内循环冷却水流量能有效地改变凝汽器压力,进而调节机组出力。调节过程中,机组背压趋向于边界压力的速率不同,循环水流量变化对机组正向出力与反向出力影响深度具有不对称性。
As an important auxiliary systems of thermal power units, Cold-end system and operating status of the equipments inside have a major impact on the unit＇ s economy and security. Under certain conditions, condenser pressure can be considered as back pressure of steam turbine, which have great influence on the unit power. Back pressure calculation model was developed from the working principle of the condenser and cooling tower to research the effect of circulating water flow continuous change on back pressure and unit output. Results shows that by adjusting circulating cooling water flow of the cold-end system can effectively change the condenser pressure and then adjust the unit output. Adjusting circulating cooling water flow has different effects on the unit forward and reverse output and the rate of back pressure tending to the safety boundary is not equal.
出处
《汽轮机技术》
北大核心
2013年第2期131-134,共4页
Turbine Technology
关键词
冷端系统
背压
循环水流量
机组出力
cold-end system
back pressure
cooling water flow
unit output
