一、电除尘器低压控制系统的组成及控制要求

电除尘器的低压控制工艺主要包括振打控制，绝缘子温箱电加热控制灰斗电加热控制、卸灰控制、料位控制、进出口温度显示、高压隔离开关到位显示以及远程通讯等。

1.1振打控制系统

电极振打清灰是电除尘器的主要工作过程，其清灰效果不仅与施加在阴阳极上的振打加速度有关，而且振打周期对其影响也很大。传统的振打方式为切向振打，其控制可分为连续振打和定时振打。在振打力度和均匀性都满足要求时，振打制度是否合理，对电除尘器除尘效率影响极大。振打过频，收集在阳极极板上的粉尘不能成块落入灰斗，二次飞扬严重，尤其末级电场的二次飞扬，将大大降低除尘效率。反之，振打周期过长，阳极上的粉尘堆积过厚，会使阴阳极之间电压降低，二次电流降低，电晕功率减小，除尘效率下降;阳极板严重积灰甚至形成反电晕，使已经被收集在在阳极板上的粉尘再次进入气流。因此，选择合理的振打周期，将有助于更好地清灰和提高除尘效果。

1.2卸灰控制系统

进入电除尘的粉尘被阴阳极捕获后，由振打系统振落在灰斗中，这些灰料应适时排送出去，灰料堆积太多，相互了增加灰斗的荷重外，严重时还会造成阴阳之间的短路，使电除尘器无法正常运行，相反，灰斗没有储灰，在灰斗出口出现漏风，引起二次扬尘，使除尘效率降低。

1.3极热控制系统

加热控制系统的对象包括大梁电加热器、阴瓷轴电加热器、灰斗电加热器等。常用的控制策略是根据测温装置的温度信号对电加热器进行恒温控制。当温度地狱下限时，启动电加热器加热;温度高于上限时，停止电加热器加热。

二、电除尘器低压控制系统的应用实例

山东某厂使用的低压控制系统除尘室采用三电场除尘方式，电除尘器3个电场有6个振打电机、3个灰斗加热控制器、3根大梁加热控制器、3个卸灰电机，再加上报警用信号输出端、热风电机控制、总启动、故障解除、3个电场料位计检测输入、大梁灰斗等处温度、控制等，总计是20点数字输出、23点数字量输入、8点模拟量输入,6TC温度测量输入。

根据以上计算，电除尘器低压控制系统以CPU-224A为主控部分。

其中CPU224A模块接受电机驱动保护器的故障信号，电加热保护控制器的故障信号，温度采集处理器的温度信号，料位信号以及输卸灰设备的电气信号等，经分析处理后，根据工艺流程把控制振打电机、加热器、报警器等控制信号输给相应的外部设备。数字量输入/输出模块EM223把CPU模块控制卸灰电机的信号输给相应的外部设备。模拟量输入模块EM231把高压硅整流设备的有关信号及温度采集器送进来的进出口烟气温度，大梁、瓷轴、灰斗等处的温度信号送给CPU模块分析处理。

三、电除尘器低压控制系统的软件设计

3.1振打控制设计

根据多年对电除尘器低压控制系统的运行经验，为提高电除尘器的除尘效率，有效降低功耗，对本地振打电机的优化控制作如下要求：

同一电场中阴极和阳极振打不能同时进行;

多电场除尘器中，前后电场阳极(或阴极)振打不能同时进行;

设置有振打槽板的电除尘器，其末电场阳极振打和槽板振打不能同时进行。

3.2加热工作

加热器采用恒温区间控制，即以设定温度的上、下振幅为工作区间来控制加热器的启停。当测量温度低于设定温度低于设定温度的下偏差时，加热器开始工作，当加热到测量温度高于设定温度的上偏差时，加热器停止工作，直到测量温度低于设定温度的下偏差，加热器再次开始加热，循环往复，完成温度控制。

3.3卸灰控制设计

电除尘器的卸灰方式可分为定时自动卸灰，上、下料位自动卸灰及上料位定时自动卸灰。在本系统中采用的是“高料位+时序”的控制方法，即高料位定时卸灰，周期卸灰相结合的综合方式。所谓高料位卸灰指的是当低压控制系统检测到某一上料位信号时先启动相应的卸灰装置;当器工作一定时间后，再延时一段时间停止相应的输灰联锁系统。为避免出现料位计损坏或者误报而导致电场堵灰，又加入定时周期卸灰功能，以保证系统能够进行自动卸灰。

原标题:PLC在电除尘控制系统中的应用

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Cincinnati  Circuit Board PCB 826682 Rev D

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GE CIRCUIT BOARD IM0234A/1K-1023776 / PCB IM0234A REV-3

FANUC A20B-2900-0490  PLC PCB BOARD.                     16E

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MEASUREX 09437700 PIDP REV B PCB CIRCUIT BOARD

GENERAL ELECTRIC PCB BOARD 36A353775AA-A

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Fanuc Printed Circuit Board A16B-2200-016 Axis Control PCB

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Fanuc Printed Circuit Board A16B-2200-009 PCB

SIEMENS 5.35200.00.020.0-A PCB BOARD

Zeiss 608093-9103 CMM PCB Coordinate Measuring Machine Circuit Board Card 

TDK 95B002 M2182B PCB JOINT BOARD 63604097 >

FOXBORO ISOLATOR MODULE   2A0-L2C-d ISOLATOR OUTPUT MODULE PCB NEW

ANN ARBOR TECHNOLOGIES SHARP 12.1 ADAPTER BOARD PCB806B

FANUC A16B-1212-0540/04B E-STOP BRAKE CONTROL PCB BOARD -  - FREE SHIPPING

TORNATECH INC. TTI ANNUNCIATOR CIRCUIT BOARD 2ANU003.0612 / 6PCB011

Newport 63299 Rev A Camera PCB

Miller Welder Intellimatic PCB Printed Circuit Board Card  # 089900

1  LUMIFLEX 30539B PCB BOARD/ASSY FOR ULZ5-4/1 ***MAKE OFFER***

AVAL DATA  AVME-115  MPU05 AVME- 115 PCB BOARD

SILICON VALLEY GROUP SVG 80042B CONNECTOR INTF PCB

CENTIGRAM COMMUNICATIONS 2410-0226-14 2450 REV E6/97 BOARD PCB >

CSR Contraves NC 400  CONTROLLER Circuit Board PCB.  #-  PC0529A

BECK ESR-4 CONTROL PCB CIRCUIT BOARD 13-2245-03 NIB

GAI LANTEK PCB CIRCUIT BOARD GL187 REV B

CINCINNATI MILACRON 3 531 J720A PCB BOARD

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910-04105 MERCURY RACE MCH6 VME Board PCB Card Module                       S

GENERAL MOTION CO. DBL. BOARD MICROPROCESSOR BOARD PCB30027-001 REV C

TTC IEEE 488 INTERFACE BOARD 30468 REV B BOARD PCB

New Sealed Modular Devicenet 0535-0543-01-0 REV B PCB Circuit Board Free Ship

HONEYWELL  14507256-001  PCB CIRCUIT BOARD ASSEMBLY

YASKAWA PCB CIRCUIT BOARD JANCD-10O3E / DF8202426/C0 REV.C0 / DF8203498-CO

GSI PCB CONTROL BOARD PCB371-RP04

Bridgeport PCB 2933163

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MALCOM MIX-1C 9310 DIGITAL DISPLAY BOARD PCB >

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MPM ASSY PC-267 / PCB PW-017 MOTION MOTHERBOARD NEW >

Electro-Pro Inc 25120-03 Rev 001 PCB Control Circuit Board  Free Shipping

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CPU INTERFACE PCB BOARD A-13617-1 / 33-1503-2

PRINTED CIRCUIT BOARD 0505790 REV 10

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RITTER ELEKTRONIK PCB 10013192 ER137G LS

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CINCINNATI MILACRON 3-530-3020 CNC PCB  WORKING

CINCINNATI MILACRON 3-530-3019 CNC PCB  WORKING

AUTOMATIC CONTROL PCB BOARD  PWB C01056

OCTEL VMX 300-6018-001 BOARD PCB AVAYA / OCTEL / AT&T >

GOULD MODICON PRINTED CIRCUIT BOARD 497809 / 897809-1

GOULD MODICON PRINTED CIRCUIT BOARD 897637 REV U

PRINTED CIRCUIT BOARD 497813 REV M

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GOULD MODICON PRINTED CIRCUIT BOARD 497515 REV K

DYNAMIC BRAKE DRIVER PRINTED CIRCUIT BOARD 5880C84H01 REV 2

LENZE PCB CIRCUIT BOARD CARD  6.7129.04310 NIB

FANUC A20B-3900-0061/02B PLC PCB BOARD MEMORY CARD  NICE Q6

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SCR 94-156098-004 PCB NIB

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GRAIN SYSTEMS INCORPORATED GSI GRAINBIN CONTROL BOARD PCB370-RP04

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METTLER TOLEDO KC575944 GGG (PCB 8142 S/D RACK)  (NEW)

Fanuc A20B-1007-0800-02B PCB Board A20B-1007-0800/02B  (C44)

BALANCE TECHNOLOGY CONTROL BOARD PCB 34059-C

Lot 8 Allen Bradley Printed Circuit Board  117501 126508 133765 11594 C32

NEW Printed Circuit Board 0-55325-45 C Automation PLC Control Board EC5001040

Gould Modicon Board AS-203P-000 PCB C10

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WHEDCO CONTROL CARD PCB-3695

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FREESHIPSAMEDAY PCB ASSEMBLY 089205 REV C1/B 37/96

Andtron CO 4020 I/0 Board TRAK4B Printed Circuit Board 

559337 PCB Circuit Board

6K222 Power Supply PCB Circuit Board

748090E PCB Circuit Board

775-9410-1 PCB Circuit Board, KX

PCB CURCUIT BOARD RSM-3 94V-0 0826

NELSON ELECTRIC GENERAL SIGNAL GB-366-003 PCB CIRCUIT BOARD

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Stanley, PCB Main Board For T701/T702 X5063

SM Electrics NMEA 210.24.0.0 NMEA Expansion Module PCB10002.4

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INTEL ISBX 350 1003067-02 CJ 144395-001 BOARD PCB

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3000-4010-4100 PCB US DRIVES

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NNB PCB Z-8464

MEASUREX PCB BOARD BASIC ASSY NO 05341400 053414 00

GE FANUC A20B-2900-0311/02B 03B A20B-2900-0311 PCB 1 YEAR WARRANTY

ALTO SHAAM ST2006-SM 128300001974 PCB BOARDS

Cummins ONAN transfer switch pcb assembly signal module 300-3096 rev C

DIVERSIFIED TECHNOLOGY 0125-104178 CIRCUIT BOARD 651200978 PCB CPU 386S NEW $199

CTI Connect Tech Inc Intellicon FLEX-8 PCB 45807 REV C Board

Philips Healthcare  M1401 60300 PCB REVR BACKPLANE M140160300

US DRIVES PCB 3000 4000

HP 5970 PCB B-2942-23 Circuit Board  #14

BLH 5540 CHANNEL SELECTOR PRINTED MODULE PCB CIRCUIT BOARD - NEW

VERSATEC G10 G11 PCB A10-019609-011 Card Board Assy

Teradyne AD356 Rev B, 879-356-00/B PCB Board, USA

Hurco V2 ATC Relay PCB Assembly 415-0241-001 Rev A

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Hypertherm I/O PCB 041144, 041145 REV 1 041291 Rev B

Micrion 150-1390 rev A1 PROC MOD-COL ELEC-WB RECEIVER PCB

ROHS EnergyHub EH PN: 3-110 R5 with EH PN: 3-401 R4 PCB

GE  PRC-100 RAPPER CONTROL INTERFACE BOARD   7610023 REV D  PCB CIRCUIT BOARD

CAI PCB 1160011 BOARD

OHP 15555T200A PCB BOARD *NEW NO BOX*

FANUC BMU 64-2 A87L 0001 0016 05D pcb011

PFA-100 Interface PCB Assy: 4220-0177

#SLS1F574 Nachi Printed Circuit Board Nachi UM 134A  #10103LR

ALTIGEN 5SMUSA-25184-PF-E TYPE USOC RJ11C PCB 2001-0010-A3

SIEMENS * 412-2B710.89 INTERFACE PCB BOARD  * 221312

FUJITSU E14L-7060-S000 BRGENA MODULE PCB CIRCUIT BOARD

FREESHIPSAMEDAY TRIENCO 1000-1201 ELECTRONIC FLYWHEEL PCB ASSEMBLY 10001201

FREESHIPSAMEDAY TEK-AIR 1392PCB00002 REV B FLOW CONTROL PCB CIRCUIT BOARD

Fanuc PCB 10M/T Board Unit, # A16B-1210-0350, , WARRANTY

800S/SX/S+ Multiport 800S Rev EH PCB 07-00800-00 Rev F

Fisher Rosemount DM6361X1-A1 Input Card Circuit Board PCB 39A7279X012 Free Ship!

14 day WARRANTY Teradyne AD359 RevA Control Circuit Board PLC PCB

ALLEN BRADLEY 5603 129 WITH VDZ PCB BOARD

FANUC PCB - DIGITAL SERVO CHECK **, W/ WARRANTY - A20B-1006-0490

FANUC PCB FOR FANUC ROBOCUT **, W/ WARRANTY - A16B-1700-0060

PCB Assy MMEZ 4520.8041.4B Motor And Sensors Controller **Free Shipping

New LCD Display PCB13416-001A0

Coherent 0214-648-01 Rev C 49786-01 DSP-00B.PCB pull Coherent LabMaster Ultima

Epic 23391-2 Circuit Board PCB Rev. C Free Shipping!

PERGRAPHI PERRETTA GRAPHICS PCB00160 RQAUS1

PCBPIEZOT PCB PIEZOTRONICS J353B77 RQAUS1

Barber Coleman A-11754 PCB Computer Circuit Board CRT

RAMSEY 071637 PCB CIRCUIT BOARD REV C D552840

GE GENERAL ELECTRIC 44B502421-G03/001 44A504175 PCB BOARD

GIDDINGS & LEWIS 501-03203-00 502-02815-00 PCB BOARD

NEW TOSHIBA 42772B REV CF PCB CIRCUIT BOARD D545820

 FOXBORO D3008RQ A,D3008RQ,F7829E,D3001BN PCB BOARD ,BOXZS

SAAB Tank Control PWB 9240 002-181 A PCB DRM 9550 9240 002-532 A

Phytec Broadgate P1742/4 ISS 01 Interface Daughter PCB

BOFORS ELEKTRONIK H-2-KRR-2 Card PCB Circuit Board Module

MIKUL 6218 FURNACE PCB CIRCUIT BOARD

 CIC SYSTEM, GIC SYSTEM PB4 PCB BOARD 3584900701  3584,0AC24A GI

NEW COMMTECH LCI-1-0 PCB BOARD MODULE LCI10

ESEC SA 650.025/2 PCB BOARD ***XLNT***

 LAWSON LABS INC DP63 REV D DISPLAY PCB BOARD BV

 LAWSON LABS INC DP63 REV C2 A-02, 52-91 DISPLAY PCB BOARD BV

 Omron VT-WP15, 2395244-5A Circuit Board  PCB BOARD BV

 MOTOROLA MVME 705-1,VME MODULE, PCB BOARD,BOXYM

EATON DYNAMATIC 15-565-16 CONVERTER GATE DRIVER BOARD PCB DRIVE INVERTER ASSY

GENERAL ELECTRIC GE 44B395098-001 CNC PCB BOARD  44B395098001

SWC ETC615901 Lot # Q11792-009-1 PCB Board *Fully Tested & Working*

 RYCO 110-1567-1 TECHNOTRANS AMERICA  PCB CIRCUIT BOARD,BOXYL

Bertsch PCB 1298

Bertsch PCB 0198

902-003 AC TECH 902003 REVERSING PCB BOARD 605-002A FREESHIPSAMEDAY

 VENTEK 280-0001-55 VER 2.1 VIDEO AMPLIFIER CARD PCB VERSALOGIC ,AZ

BOFORS ELEKTRONIK H-2-KK H2KK Card PCB Circuit Board Comparator Module

RARE!! HONEYWELL 82407381 001 YAMATAKE CONTROL CARD ASSEMBLY PCB // BRAND NEW!

HONEYWELL UNIVERSAL ANALOGUE PCB CIRCUIT BOARD CARD L122725 AV01W17-A PC123312

Refurbished Cutler Hammer 58-3560 Industrial Circuit Board PCB Controller

Siemens Circuit Board, PCB 6RB2000-0NF01, 447 700.9085.01 E F G

ABB PCB Circuit Board, 3HAB2241-1, DSQC 325, , Warranty, Read Description

MCC ELECTRONICS 21981 PCB PN-21981

OMRON TPC-5260A PCB MODULE **

Spindle/Servo Interconnect PCB Circuit Board 4202364 C_4202364C_T4202365A

 515-0084 2 Channel Control Board, REV C, 495-0198 EAM L REV C PCB BOARD  DK

KEITHLEY PIO-HV 14242 REV 2 PCB8382 PCB DIGITAL I/O BOARD 24 BIT

FANUC ROBOTICS SERIAL PORT CIRCUIT BOARD PCB A16B-2200-0173/05A

FREESHIPSAMEDAY SCANVAEGT 810349 PCB CIRCUIT BOARD 283874 PCB 810160

UNIDYN UNI DYN PCB-043 RQAUS1