plc在電除塵系統中主要作用是控制所有低壓設備自動運行和遠程監控高壓整流供電設備，對低壓設備的控制一般都有現場手動和遠程自動兩種控制方式，所控制的設備包括陰極振打、陽極振打、灰斗卸灰閥電機、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、高壓供電設備安全聯鎖以及遠程監控等[2](見圖3)。下面對自動控制方式進行簡要介紹。

廈門岳航計算機工程有限公司

聯系人：李素云

企業QQ：2851195446，2851195466

手機：18965423501

座機：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通過傳動軸將動力傳給陰、陽極振打機構，使陰極線、陽極板上的積灰振落到灰斗中。plc系統通過控制器中的時間繼電器控制陰、陽極振打電機按照一定的時間規律相互配合運行，并根據振打電機對應的接觸器和熱繼電器的返回信號對電機狀態進行監控和保護。陰、陽極振打的一般控制規律為：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，具體時間需根據電除塵器剛投產時的測試情況及工藝參數進行確定;以24小時為總振打周期，夜間運行周期要比白天運行周期短[3];陰、陽極振打相互配合運行，但振打周期各自獨立計算，陽極振打要比陰極運行時間長、強度大;振打反饋信號只起狀態監視和保護作用，不加入周期運行控制當中;為節約能源，振打運行反饋信號與高壓整流供電設備有聯鎖，當大量振打運行時，高壓整流供電設備低電壓運行或停止，以實現降壓振打，此方式可節約大量能源。

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

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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