plc在電除塵系統(tǒng)中主要作用是控制所有低壓設(shè)備自動運(yùn)行和遠(yuǎn)程監(jiān)控高壓整流供電設(shè)備，對低壓設(shè)備的控制一般都有現(xiàn)場手動和遠(yuǎn)程自動兩種控制方式，所控制的設(shè)備包括陰極振打、陽極振打、灰斗卸灰閥電機(jī)、倉壁振動器、絕緣子保溫梁電加熱器、灰斗保溫電加熱器、灰斗料位計、煙氣進(jìn)出口溫度顯示、絕緣子保溫梁溫度顯示、聲波清灰裝置、輸灰系統(tǒng)、高壓供電設(shè)備安全聯(lián)鎖以及遠(yuǎn)程監(jiān)控等[2](見圖3)。下面對自動控制方式進(jìn)行簡要介紹。

廈門岳航計算機(jī)工程有限公司

聯(lián)系人：李素云

企業(yè)QQ：2851195446，2851195466

手機(jī)：18965423501

座機(jī)：0592-5165501

4.1陰、陽極振打的控制

電除塵器的陰、陽極振打都是由電機(jī)通過傳動軸將動力傳給陰、陽極振打機(jī)構(gòu)，使陰極線、陽極板上的積灰振落到灰斗中。plc系統(tǒng)通過控制器中的時間繼電器控制陰、陽極振打電機(jī)按照一定的時間規(guī)律相互配合運(yùn)行，并根據(jù)振打電機(jī)對應(yīng)的接觸器和熱繼電器的返回信號對電機(jī)狀態(tài)進(jìn)行監(jiān)控和保護(hù)。陰、陽極振打的一般控制規(guī)律為：一電場的陰、陽極振打周期*短，以后的各個電場振打周期逐漸加長，具體時間需根據(jù)電除塵器剛投產(chǎn)時的測試情況及工藝參數(shù)進(jìn)行確定;以24小時為總振打周期，夜間運(yùn)行周期要比白天運(yùn)行周期短[3];陰、陽極振打相互配合運(yùn)行，但振打周期各自獨(dú)立計算，陽極振打要比陰極運(yùn)行時間長、強(qiáng)度大;振打反饋信號只起狀態(tài)監(jiān)視和保護(hù)作用，不加入周期運(yùn)行控制當(dāng)中;為節(jié)約能源，振打運(yùn)行反饋信號與高壓整流供電設(shè)備有聯(lián)鎖，當(dāng)大量振打運(yùn)行時，高壓整流供電設(shè)備低電壓運(yùn)行或停止，以實現(xiàn)降壓振打，此方式可節(jié)約大量能源。

Lot of 25 Allen Bradley 1492-L3Q Feed Through Block , 2 Connection Points

New Lot of 55 Allen-Bradley 1492-L3-RE Series A - One Circuit Feed Through Block

New Lot of 65 Allen-Bradley 1492-L3-B Series A - One Circuit Feed Through Block

New Lot of 45 Allen-Bradley 1492-L3-OR Series A - One Circuit Feed Through Block

New Lot of 20 Allen-Bradley 1492-L3 Series A - One Circuit Feed Through Block

New Lot of 20 Allen Bradley 1492-ERL35 Screwless end Retainers for 35mm DIN Rail

Lot of 30 Allen-Bradley 1492-L3-B Series A - One Circuit Feed Through Block

Lot of 65 Allen-Bradley 1492-L3-B Series A - One Circuit Feed Through Block

NEW Box of 100 Allen Bradley 1492-L3 One-Circuit Feed Though Block 2.5mm

NEW Allen-Bradley 1797-TB3S 3 Wire EX-Terminal Base Spring Clamp

AB Terminal End Barrier & Clamps 1492-WD4 EBD3 EA35 WG4

AB Terminals End Barrier End Clamps 1492-W16 EB16 EA35

Lot of 6 Allen Bradley 1492-WG4 Grounding Terminal Block 4mm^2, IEC 60947-7-2

Lot of 6 Allen Bradley 1492-EA35 End Block

Lot of 10 Allen Bradley 1492-J4 Series-A Terminal Blocks, 600V, 4mm^2

Lot of 10 Allen Bradley 1492 10-Slot Center Jumpers

Lot of 5 Allen Bradley 1492-RTS2 Terminal Block 50V

Lot of 10 Allen Bradley 1492-RTS2 Terminal Block 50V

Lot of 24 Allen-Bradley 1492-W4 Terminal Blocks 800V, 4mm2

Lot of 18 Allen-Bradley 1492-ERL35 Terminal Blocks

Lot of 14 Allen Bradley 1492-W4 Terminal Blocks 600VAC/DC Gray

Lot of 3 Allen Bradley 1492-EA35 End Anchor for Terminal Blocks

Allen-Bradley 1489-AACL218 18 Pole Bus Bar

1747-SDN

1756-A13

1756-CN2

1756-CNBR

1756-CP3

1756-IM16I

1756-PA72

1756-PA75

1756-PA75

1762-IF4

1762-IF4

1766-L32BXBA

1771-CP1

1783-US8T

1785-L20B

1C31169G02

2094-BC02-M02-S

2707-L40P2

2711-M3A18L1

3720 ACM

3A99158G01

Wago 289-623 Breakout Interface Module D-Sub 25-Pin 125VAC/DC 2A DIN Mountable

New Allen Bradley 2090-U3BB-D44 Breakout Board

New Yaskawa SBK-U-VBA-A5 Terminal Block & Cable Kit, Breakout Board

Wago 50036746 50-Pin D-Sub Breakout Board DIN Mountable

New Omron XW2B-20G4 Terminal Block 20-Pin

Phoenix Contact UMK-SE 11.25 Terminal Block

Wieland 87.200.2202.3 D-SUB Connector to Screw Terminal, 25-Pin Female w/Cable

Phoenix Contact ET2 Terminal Block, 26Pin , 60V

Phoenix Contact UMK-SE 11,25-1 Terminal Block, 25 Pin

Phoenix Contact UMK-SE 11,25-1 Terminal Block, 40 Pin

Phoenix Contact UMK-PVB 2/24/ZFKDS Breakout Board