ELECTROSTATIC PRECIPITATOR

( ESP )
AVC Settings & Upgrades / O & M

TAI & Chyun Associates Industries, Inc.

Integrated Process Control System Schematic Diagram
To Plant DCS

Castlet
Citect
PMS

I/O
CANopener
Opacity

PLC

Inlet Outlet

m m m

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MCS Microcomputer Control System
SCR

Voltage
Divider

Inlet
OutLet

KV

mA
Fan

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 Typical ESP SCR-CLR Electrical System
SCR
Transformer/Rectifier Set
Current Limiting
Reactor (CLR)
Power Source

Primary Voltage
Meter (AC)
+ –
V

Voltage
Divider
Primary Current
A
Meter (AC)

Secondary Current Secondary Voltage

Firing Automatic Meter (DC)
–
Meter (DC)

Circuit Voltage Control mA KV

– + +
Microprocessor
Control Module

Signal
Precipitator
Resistor

Signal
Resistor

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 SCR Firing Angle - Typical Sine Wave

8.33 Milliseconds
1 Half Cycle (H/C)

+ Power On

Time
–

Conduct
Angle 90º

0º 90º 180º 270º 360º

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 AVC Settings

TAI & Chyun Associates Industries, Inc.

Principle of High Voltage Control - Continuos Mode

Re-instatement of
4.5
TwoKV/s Ramp
sparks within
SlowRamp
Spark
Fast
Ramp Ramp
(Slope) No Spark
SPKfor
INT30s
setting
cause De-ionization
Step
Vmean
(Quenching)

Recovery
Deion Time
(Arc Quenching)

Time
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Principle of High Voltage Control - Continuos Mode

Re-instatement of 4.5 KV/s Ramp

Ramp (Slope)

No Spark for 30s

Vmean
Step
(Quenching)
Recovery

Deion Time
(Arc Quenching)

Time
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 Principle of High Voltage Control - Pulsing Mode

T1

Vmean

T2 Infill

Time
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 Principle of High Voltage Control - Pulsing Mode

Actual Pulsing Curve

Vmean

Time
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 AVC Upgrades

TAI & Chyun Associates Industries, Inc.

„ What is ESP controller (AVC) ?
„ How many AVC for an ESP ?
„ Why MCS-II / GVC / XM AVC ?
„ How many keypad/display for an ESP?
„ How to retrofit modern AVC ?
„ How long it takes to retrofit AVC?

TAI & Chyun Associates Industries, Inc.

What is ESP controller (AVC) ?
SCR

ID
Fan

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How many AVC for an ESP?

TAI & Chyun Associates Industries, Inc.

Why MCS-II / GVC / XM AVC ?
„ Pulse mode
Allow to adjust pulse width to cope with varying process conditions

„ Power saving more than 30%

Fast payback ﹩

„ Rapping Control
Save the rapping panel ﹩

„ Auto V-I curve plotting, Vp/Ip/Is/Vs trending

powerful ESP problem diagnostic tools

„ Microprocessor based ESP AVC

CPU based MCS-II with faster response and more powerful
operating modes than EPROM based

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How many keypad/display for an ESP?
One Keypad/display needed

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How to retrofit modern AVC ?
1. Dismantle old keypads/displays，install the MCS-II’s

TAI & Chyun Associates Industries, Inc.

How to retrofit modern AVC ?
2. Dismantle old AVC PCBs，Install new AVC PCB

Old

MCS-II
PCB
SCR

Contactor

Breaker

To TR

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How to install MCS-II ?
3. Change TR’s feedback signals to fit new AVC

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How long it takes to retrofit AVC ?
2 days for the 1st panel , 1 day for a panel.
Zone shutdown one by one

MCS-II
TAI & Chyun Associates Industries, Inc.
AVC Supplied By T&C
MCS-II System AVC.XM System GVC System

MCS-II Main Board AVC XM Main Board GVC Main Board

MCS-II Keypad Panel Display Portable Terminal GVC Keypad

TAI & Chyun Associates Industries, Inc.

Reference:

Taiwan Linkou Power Station 2 Units, 30 sets -Retrofit

TAI & Chyun Associates Industries, Inc.
Reference:

Hong
TAI &Kong ChinaIndustries,
Chyun Associates Light &Inc.Power 8 Units, 112 sets -Retrofit
Reference:

Thailand BLCP Power Station 2 Units, 32 sets –New Installation

TAI & Chyun Associates Industries, Inc.
Reference:

Thailand SCG Kaeng Khoi CM9, 3 sets -Retrofit

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Reference:

Philippines Republic Cement Batangas, 3 sets -Retrofit

TAI & Chyun Associates Industries, Inc.
System Integration DCS
DCS

HUB

Ethernet Ethernet
HUB HUB

CCR CCR CCR

Unit 1 Unit 2 Unit 3 Unit 4

LCR

CANopener MMI MMI CANopener MMI

CANopener
RS232 RS232 RS232

PLC PLC PLC

MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS MCS

EP
Digital / Analogue I/O : Digital / Analogue I/O : Digital / Analogue I/O :
Air Purging Fan Air Purging Fan Air Purging Fan
Heaters Heaters Heaters
Hopper Level Sw Hopper Level Sw Hopper Level Sw
Hopper Vibrators Hopper Vibrators Hopper Vibrators
Other Motors Other Motors Other Motors
Others Others Others
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 END OF SESSION

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