• Author / Uploaded
• Bhargav Chaudhari

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CONTROL & INSTRUMENTATION / FB CUSTOMER TRAINING PROGRAM VENUE: BHEL, HRDC, TRICHIRAPALLI – 14.

TITLE: OPERATION, MAINTENANCE & CARE OF BOILERS

LECTURE ON: OPERATION & MAINTENANCE OF CONTROL & INSTRUMENTATION

FACULTY: Mr. R.ANBARASU, DGM.-C&I/FB.

Over view 1.

Control Systems & its Types 

Pneumatic Control



Hydraulic Control



Electrical Control

2.

Furnace Safeguard Supervisory System (FSSS)

3.

Programmable logic control (PLC)

4.

Auto Control System

5.

Instrumentation 

Pressure Measurement



Temperature Measurement



Level Measurement



Flow Measurement



Vibration Measurement

6.

7.

New products introduced (BHEL make-Indigenous))



EWLI-Electronic Water Level Indicator



BHELMHO Switch



BHELSONIC-Sonic tube leak detection system



BHELFEED-Microprocessor based Gravimetric



Feeder control system



BHELSCAN- Microcontroller based Flame Scanner system

Trouble shooting 

Problems in Safe Flame Scanner System

CONTROL SYSTEMS & ITS TYPES

Control Systems & Its Types • PNEUMATIC CONTROLS # Regulating Control # On/Off Control • HYDRAULIC CONTROL # Regulating Control # On/Off Control • ELECTRICAL CONTROL # Regulating Control # On/Off Control

Pneumatic Control

Open/Close Power Cylinder

S

AFR

AIR LOCK

S

Regulating Power Cylinder POSITION TRANSMITTER

4-20mA

4-20mA

ZT

Positioner

E/P

AIR FILTER REGULATOR

I P

AFR

AIR SUPPLY AIR LOCK

Pneumatic Valve (Air to Close Type)

Pneumatic Valve (Air to Open Type)

I/P CONVERTER

Hydraulic Control

Electrical Control

Electrical Control Circuit (Of Soot Blower)

Motor Control (Of Soot Blower)

Motor Control Centre (MCC)

Motor Control Centre (MCC)

Electric Actuator

AUTO CONTROL SYSTEM

Autocontrol Legends / Definitions No

Function

Symbol

Definition

1

SUMMING

The outputs Equals the Algebraic Sum of the Inputs

2

Averaging

The outputs Equals the Algebraic sum of the inputs divided by the number of inputs

/n 3

Difference

4

Proportional

5

Integral

The outputs equals the Algebraic difference between two inputs

K or P

The output is directly proportional to the input The output varies in accordance with both magnitude and duration of the input.The output is proportional to the integral of the input.

Autocontrol Legends / Definitions No Function 6

Derivative

7

Multiplying

8

Dividing

9

Root Extractor

10 Nonlinear or unspecified Function

Symbol

Definition

D or d/dt

The outputs is proportional to the rate of change (derivative) of the input.

X

The outputs Equals the products of the two inputs.

. .

The outputs equals the Quotient of the two inputs The output equals the root

F(x)

The output equals some nonlinear function of the input.

Autocontrol Legends / Definitions No Function 11 Time Function

12 High Selecting

13 Low selecting 14 High limiting

Symbol

Definition F(t)

>


15 Low limiting