華北電力技術(shù)NORTH CHINA ELECTRIC POWERNo.2 2014.技術(shù)改造.循環(huán)水泵出口液控蝶閥控制系統(tǒng)優(yōu)化匡磊,李涌斌,張久洲(廣東大唐國際潮州發(fā)電有限責任公司,廣東潮州515723)摘要:循環(huán)水系統(tǒng)將冷卻水送至高低壓凝汽器 去冷卻汽輪機低壓缸排汽,以維持高低壓凝汽器的真空,使.汽水循環(huán)得以繼續(xù)。循環(huán)水泵出口液控蝶閥與循環(huán)水泵存在著密切的聯(lián)系,因此循環(huán)水泵出口液控蝶閥的安全性對循環(huán)水系統(tǒng)尤為重要。介紹了重錘式液控蝶閥的一般控制方式,分析了循環(huán)水泵出口液控蝶閩PLC控制邏輯存在的不足,提出將循環(huán)水泵出口液控蝶閥控制引入DCS系統(tǒng)的改造方法。設(shè)計了就地控制循環(huán)水泵出口液控蝶閥的電氣回路,就地控制電源改為220 VAC,解決了信號遠距離傳送的問題,并提高了電源控制系統(tǒng)的可靠性。關(guān)鍵詞:液控蝶閥;DCS;控制系統(tǒng);改造中圖分類號:TK32文獻標識碼:B文章 編號: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改造前的液控蝶閥控制方式和存在的潮州發(fā)電廠1.2號機組為600 MW火力發(fā)電問題機組,配1.2、3.4號4臺循環(huán)水泵,1號機組用1、1.1 改造前的控制方式2號2臺循泵,2號機組用3、4號2臺循泵,每臺該廠循環(huán)水泵與出口液控蝶閥之間的聯(lián)鎖機組的兩臺循泵互為聯(lián)鎖備用,2臺機組循泵出邏輯做在DCS中,液控蝶閥自身的控制邏輯都通口母管通過聯(lián)絡(luò)門可以互為備用。循泵出口蝶過PLC控制,就地開、關(guān)液控蝶閥指令也送至閥為長沙閥門廠生產(chǎn)的重錘式液控止回閥,控制PLC。開啟液控蝶閥和運行過程中補壓通過啟動裝置為PLC控制。在實際應(yīng)用中發(fā)現(xiàn)液控蝶閥.油泵實現(xiàn);關(guān)閉液控蝶閥時由電磁鐵帶電打開泄控制存在不足,為提高循環(huán)水控制的可靠性,將油通道,利用中國煤化工。液控蝶閥液控蝶閥的控制引人到DCS系統(tǒng)，并在DCS邏油路圖和控MYHCNMHG輯中對原有控制思想進行優(yōu)化。.No.2 201華北電力技術(shù)NORTH CHINA ELECTRIC POWER40壓力表,高壓膠管調(diào)速閥串聯(lián)手動閥. 單向法中并聯(lián)手動閥手搖泵H- 慢關(guān)時間調(diào)節(jié)閥蓄能器快關(guān)時間調(diào)節(jié)閥中|.快慢關(guān)時間調(diào)節(jié)閥中成溢流閥電磁閥1. 此部分集聚在擺動油缸(接力器)內(nèi)m-重錘電機」油泵濾油器L濾油器一油箱圖1油路圖開指令型侈MR__M_M__M_X0O2_XOHL_Z_ro0o)油泵啟動(開閥和| Y000關(guān)指令無高油無關(guān)指于&無停止未過載 K12000補油)T4T_X010Y0OL油溫X007| 油樂在油壓高Y90OMTMOMIOX992原聯(lián)