半容量汽动给水泵组在深度调峰下的运行可靠性研究

Research on Operational Reliability of Half Capacity Steam Driven Feedwater Pump Set in Deep Peak Shaving

燃煤发电机组的给水系统对机组的安全稳定运行有着极其重要的作用,而汽动给水泵组本身包括复杂的系统和相应的控制过程,对给水系统甚至整个机组运行安全有较大影响。为提高汽动给水泵组在深度调峰下的运行可靠性,依据燃煤机组深度调峰至低负荷工况下的相关运行数据,对机组配备的半容量汽动给水泵组进行全面分析。相关数据表明,半容量汽动给水泵组设计有较宽的连续运行范围,能提供给锅炉相应给水量并留有充足的调节裕度,但在跟随主机负荷至20%THA深度调峰区间仍暴露出来一些问题。对相关问题进行对照分析,并提出相应改善措施,可有效提高半容量汽动给水泵组在煤电机组深度调峰下的运行可靠性。

The water supply system of Coal⁃burning electric generating units plays an extremely important role in the safe and stable operation of the units,while the steam driven water supply pump unit itself includes complex systems and cor⁃responding control processes,which have a significant impact on the safety of the water supply system and even the entire unit operation.In order to improve the operational reliability of the steam driven feedwater pump set under deep peak shaving,a comprehensive analysis of the half capacity steam driven feedwater pump set equipped with the coal⁃burning power generating units based on relevant operating data from deep peak shaving to low load conditions is conducted.The relevant data shows that the design of the half capacity steam driven feedwater pump set has a wide continuous operating range,which can provide the corresponding water supply to the boiler and leave sufficient adjustment margin.However,some problems are still exposed in the deep peak shaving range of following the host load to 20%THA.A comparative a⁃nalysis of relevant issues is conducted and proposes corresponding improvement measures,which can effectively improve the operational reliability of the half capacity steam driven feedwater pump set under deep peak shaving of coal-burning electric generating units.