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　　工業(yè)循環(huán)水軋鋼工業(yè)中占有非常重要位，其水溫高低直接影響到加熱爐和軋機等設備安全和使用壽命。為及時準確對循環(huán)水進行監(jiān)控，萊鋼軋鋼廠中小型車間水處理采用浙大中控SUPCON JX—300X DCS控制系統(tǒng)。DCS控制系統(tǒng)把計算機、儀表和電控技術融合一起，實現(xiàn)了數(shù)據(jù)自動采集、處理、工藝畫面顯示、參數(shù)超限報警、設備故障報警和報表打印等功能。并此基礎上開發(fā)了針對循環(huán)水溫溫度閉環(huán)控制。
　　2、系統(tǒng)介紹
　　SUPCON JX—300XDCS采用高速工業(yè)以太網(wǎng)Scnet作為其過程控制網(wǎng)絡，系統(tǒng)由工程師站、操作站、控制站、過程控制單元等組成，配置靈活。水處理系統(tǒng)規(guī)模，水處理SUPCON DCS系統(tǒng)設計了1個控制站，1個操作站設置安全級別可兼做工程師站)，構成兩級結構?？刂普臼乾F(xiàn)場級，直接與現(xiàn)場設備交換數(shù)據(jù)，完成整個工業(yè)過程實時監(jiān)控功能。操作站(兼工程師站)是監(jiān)督控制級，即可完成對系統(tǒng)組態(tài)、又可實現(xiàn)對現(xiàn)場級檢測、控制、保護功能管理。SUPCON JX—300X DCS系統(tǒng)SCKey組態(tài)軟件是一個全面支持該系統(tǒng)各類控制方案組態(tài)軟件平臺。 SCKey組態(tài)軟件可完成整個系統(tǒng)控制站組態(tài)(系統(tǒng)I/O組態(tài)、控制方案組態(tài)等)、操作站組態(tài)(畫面設置、系統(tǒng)流程圖組態(tài)、系統(tǒng)報表組態(tài)等)。系統(tǒng)構成如圖1所示。
　　3.1 方案設計
　　從生產(chǎn)熱線循環(huán)回來工業(yè)水流入1#、2#吸水井散熱，并吸水井塔頂1#和2#風機進行降溫，然后1#、2#吸水井底部共用一個出水管為下一個工序供水，水溫要求控制30oC以下。本系統(tǒng)吸水井出水管處安裝Cu50熱電阻對水溫檢測，把溫度信號T1送入DCS處理器，控制規(guī)律運算后給出控制信號，控制變頻器來改變電機輸入電壓頻率，來改變電動機轉(zhuǎn)速，帶動風機降溫，構成一個閉環(huán)溫度控制系統(tǒng)。變頻器選用兩臺日本SANKEN(300KW)通用型變頻器，控制原理如圖2所示。
　　循環(huán)水吸水井底部熱交換特點，對1#、2#吸水井兩臺風機電機進行主/副控制，主/副電機不同速度曲線驅(qū)動風機運轉(zhuǎn)。1#、2#電機可互為主/副電機選擇，極大方便了操作工操作。
　　3.2 軟件實現(xiàn)
　　為方便操作人員操作，操作站創(chuàng)建循環(huán)水溫度監(jiān)控畫面，可線顯示循環(huán)水溫度、變頻器速度反饋、報警等，進行1#、2#風機電機啟?？刂坪椭?副選擇控制。并切換安全等級線修改主/副電機控制回路中溫度、轉(zhuǎn)速等控制參數(shù)。
　　針對循環(huán)水溫度調(diào)節(jié)存大滯后性特點，對1#、2#風機電機采用分段控制方法，主/副電機控制曲線如圖3所示：當循環(huán)水溫度低于20oC時，主/副風機電機變頻器輸出電壓頻率均為20HZ。當循環(huán)水溫度變高時，主控制回路中變頻器輸出電壓頻率跟隨增大，當循環(huán)水溫度高于24oC時，主電機全工頻運轉(zhuǎn)。副電機循環(huán)水溫度升至23oC時，副控制回路增大副電機輸入電壓頻率，提高風機轉(zhuǎn)速，當循環(huán)水溫度高于28oC時，副電機全工頻運轉(zhuǎn)，與主電機一起為循環(huán)水快速降溫。

Siemens 6ES7 223-1PH21-0XA0 6ES7223-1PH21-0XA0 NIB

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Muco EK-630

Schneider Modicon AS-884A-311/AS884A311 CPU Controller OFFERS ACCEPTED

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Measurement Technology LTD MTL 8512-IF-HA HART Interface Module

XYCOM 70240-001 REV 1.1 I/O MODULE VME BOARD

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Reliance 0-51847-2

Schneider Modicon AS-B351-001 ASB35101 AC Input NIB FS

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Modicon PanelMate Plus PM Plus 1000 MM-PM10300C 24VDC

SIEMENS SIMATIC S5 6ES5 6ES5436-4UA12 VPE5 PLC DIGITAL INPUT MODULE 51922

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882I60930 Marposs GUAGE T5

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MODICON AS-C184-004 USPP ASC184004

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Siemens 505-6208A

Hp 81531A Optical head interface module

Wieland Bamberg WEB-1001 EGM Encoder Interface Module

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Omron C200H-ID212

Schneider Modicon AS-H827-103 Gould 11 Slot 800 Series Rack

Schneider Modicon Analog Output Module AS-BDAU-202

Schneider Modicon AS-J200-001 USPP ASJ200001

Schneider Modicon MODICON/ AS-W808-002 CABLE ASSEMBLY REMOTE I/O SIG XLNT

Schneider Modicon AS-M480-004

Schneider Modicon TSX Compact M AS-BDAP-218 ~ SURPLUS~

SMCSI EX250-IE3 DEVICENET INPUT MODULE

Schneider Telemecanique XB4-BL42 Push Button Switch

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ESI LASER TIMING/COMMUNICATION MODULE BOARD CKA 63116

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ACC, DIFFERENTIAL MULTIPLEXER, 40 CH, 7702 2074767

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SHIMADZU 4826 USPP 4826

ALLEN BRADLEY 803-A12 USPP 803A12

ALLEN BRADLEY 3500-P72 NSPP 3500P72

INVENSYS T-27MARKII NSFP T27MARKII

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YAMATAKE J-HAM10 USPP JHAM10

MILLTRONICS 7ML1127-0EA21 NSPP 7ML11270EA21

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SIEMENS 6ES5 430-4UA13 6ES54304UA13

SIEMENS S5 6ES5 430-4UA13 Digital Input Module

Siemens Digital Input Module 6ES5 430-7LA12 27680

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Texas Instruments 5TI-3000

Telenex PL-951-162-2 ISDN S/T/U Interface Module

TSXETY110 Modicon Premium TCP/IP TSX-ETY-110

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Modicon MM-PMC1-400C

Schneider Modicon Gould AS-B875-111 ASB875111 I/O Analog Input PLC Module

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Schneider Modicon AS-C484-600

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SCHNEIDER Telemecanique Switch XB4 BVB1

Schneider Automation Inc 140 DDI 841 00 140DDI84100 Input Module Sealed

PWR-4000-DC 4000W DC POWER SUPPLY FOR CATALYST 6500/7600 1YR - ASK 4 Q

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Lenze EMF2102IBCV003 Lecom-LI Communication Module EMF2102IBC-V003

SIEMENS Simodrive 6SN1130-1AA11-0BA0

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7 Digiboard DBI A/N30000354 Full size I/O ISA card

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ALLEN BRADLEY 1771-NT1 FNFP 1771NT1

ALLEN BRADLEY 1336S-B010-AN-EN-GM1-L4 USPP 1336SB010ANENGM1

GENERAL ELECTRIC DS215SLCCG2AZZ01B NSPP DS215SLCCG2AZZ0B

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Siemens 6ES5 951-7NB21 -- 6ES59517NB21

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RPS MKS ASTRON AX7685 GENERATOR

Telemecanique TSX1723428

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Wago 750-478 2-CHANNEL ANALOG INPUT MODULE

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Modicon AS-P801-001

Schneider Modicon DTA 200/AS-HDTA-200 DTA200ASHDTA200 Primary Subrack

Schneider Modicon ASB232501 Output Module AS-B232-501

Schneider Modicon AS-B875-011 8CH Analog Module ASB875011

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Prosoft MVI56-ADM 'C' Communications Module MVI56DAM

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ALLENBRADLEY2706E43J128B1OPERATORINTERFACEDATA

Allen Bradley Terminal Board 9101-1779 Amphenol Connector /Sealed

ABB K - Line K-600S 600V 600A LI AIR CIRCUIT BREAKER

Zehnb 850 incircuit Test System Zehnb 810 ICT sold for parts

(SIEMENS) WARM BOOT 3RW4444-6BC44 good in condition for industry use

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ALLEN BRADLEY 1336VT-B050-EAS-FA2-L1 USPP 1336VTB050EASFA2

GENERAL ELECTRIC 6KDV3400Q2B20 NSFP 6KDV3400Q2B20

FLEXMATE INC 3-USP-G02 USPP 3USPG02

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