循环水泵出口液控蝶阀控制系统优化

华北电力技术NORTH CHINA ELECTRIC POWERNo.2 2014.技术改造.循环水泵出口液控蝶阀控制系统优化匡磊,李涌斌,张久洲(广东大唐国际潮州发电有限责任公司,广东潮州515723)摘要:循环水系统将冷却水送至高低压凝汽器 去冷却汽轮机低压缸排汽,以维持高低压凝汽器的真空,使.汽水循环得以继续。循环水泵出口液控蝶阀与循环水泵存在着密切的联系,因此循环水泵出口液控蝶阀的安全性对循环水系统尤为重要。介绍了重锤式液控蝶阀的一般控制方式,分析了循环水泵出口液控蝶闽PLC控制逻辑存在的不足,提出将循环水泵出口液控蝶阀控制引入DCS系统的改造方法。设计了就地控制循环水泵出口液控蝶阀的电气回路,就地控制电源改为220 VAC,解决了信号远距离传送的问题,并提高了电源控制系统的可靠性。关键词:液控蝶阀;DCS;控制系统;改造中图分类号:TK32文献标识码:B文章 编号:1003-9171(2014 )02 0046-04The Control System Technological Transformation ofHydraulic-controlled Butterfly Valves for Circulating Water PumpsKuang Lei, Li Yong-bin ,Zhang Jiu-zhou( Guangdong Datang International Chaozhou Power Generation Co. Ltd. ,Chaozhou 515723 , China)Abstract :The circulating water system provides cooling water to the high and low pressure steam turbine condenserto cool exhaust steam, so that it can maintain the vacuum of high and low voltage condenser and keep the steam-watercycle continue. There is close contact between the hydraulic controlled butterfly valves and the circulating waterpump , so the safety of hydraulic-controlled butterfly valves is particularly important for the circulating water system.This article describes the general control methods on heavy hammer hydraulic - controlled butterfly valves , and analy-zes its deficiency on controlling PLC logics , then proposes the improvement measures that using DCS system to controlthe hydraulic-controlled butterly valves. In this article,it designs an local electric control circuit for the hydraulic-controlled butterfly valves. The local control power had been changed to 220 V AC,it solved the problem of long-dis-tance signal transmission , and improved the reliability of power supply control system.Key words : hydraulic - contolled butterly valves ;DCS ;control system; technological transformation0前言1改造前的液控蝶阀控制方式和存在的潮州发电厂1.2号机组为600 MW火力发电问题机组,配1.2、3.4号4台循环水泵,1号机组用1、1.1 改造前的控制方式2号2台循泵,2号机组用3、4号2台循泵,每台该厂循环水泵与出口液控蝶阀之间的联锁机组的两台循泵互为联锁备用,2台机组循泵出逻辑做在DCS中,液控蝶阀自身的控制逻辑都通口母管通过联络门可以互为备用。循泵出口蝶过PLC控制,就地开、关液控蝶阀指令也送至阀为长沙阀门厂生产的重锤式液控止回阀,控制PLC。开启液控蝶阀和运行过程中补压通过启动装置为PLC控制。在实际应用中发现液控蝶阀.油泵实现;关闭液控蝶阀时由电磁铁带电打开泄控制存在不足,为提高循环水控制的可靠性,将油通道,利用中国煤化工。液控蝶阀液控蝶阀的控制引人到DCS系统，并在DCS逻油路图和控MYHCNMHG辑中对原有控制思想进行优化。.No.2 201华北电力技术NORTH CHINA ELECTRIC POWER40压力表,高压胶管调速阀串联手动阀. 单向法中并联手动阀手摇泵H- 慢关时间调节阀蓄能器快关时间调节阀中|.快慢关时间调节阀中成溢流阀电磁阀1. 此部分集聚在摆动油缸(接力器)内m-重锤电机」油泵滤油器L滤油器一油箱图1油路图开指令型侈MR__M_M__M_X0O2_XOHL_Z_ro0o)油泵启动(开阀和| Y000关指令无高油无关指于&无停止未过载 K12000补油)T4T_X010Y0OL油温X007| 油乐在油压高Y90OMTMOMIOX992原联