control & instrumentaion

8/7/2019 CONTROL & INSTRUMENTAION

1/18

INSTRUMENTAION= SENSE ORGANS

CONTROL= NERVOUS SYSTEM


2/18

MEARURSEING INSTRUMENTSy PRESSURE : GAUGE, TRANSMITTERS

y TEMPERATURE: RTD, THERMOCOUPLE,INFRARED SENSEOR

y FLOW: ORIFICE, CORIOLIS,ULTRASONIC FLOW METER ETC

y LEVEL: TRANSMITTESR, SONARPROBES.

y SWITCHES: PRESSURE, TEMP, FLOW etc.

y SPEED: HALL PROBE

y VIBRATION: VIBRATION PICKUPS

y

AXIAL SHIFT: LVDTy THERMAL EXPANSION: LVDT

y ANALYSERS:CONDUCTIVITY, HYDROGEN PURITY, pH, O2, SOX,NOX, CO ETC


3/18

Pressure and temp gauge RTD and Thermocouple Flow switches

Level transmitters

SWAS Analyzers

Transmitters

Turbovisory equipments


4/18

POPULATION PER UNITy TRANSMITTERS : PRESSURE,FLOW,LEVEL,TEMP200

y

SWITCHES:P

RESSURE,FLOW,TEMP,LEVEL ETC 200

y THERMO COUPLES: 275

y RTDS: 400

y

ANALYSERS: 25y ACTUATORS : PENUMATIC200

y DRIVE OF ELECTRICAL ACTUATORS 250


5/18

BEST O&M PRACTICESy Preventive maintenance

The care and servicing by personnel for the purpose of maintaining

equipment and facilities in satisfactory operating condition byproviding for systematic inspection, detection, and correction ofincipient failures either before they occur or before they develop intomajor defects. Check list has been prepared and PM is being done in 2ways

1. In running condition: checking of instruments exte

rnally, cleaning,terminal tightening, arresting leakages, replacement of damaged

equipments, checking of alarm fasciaetc.

2. In shutdown condition: isolation of instruments, calibration,replacement of defective parts, checking of interlock protection.


6/18

BEST O&M PRACTICESy Tune up ofrunning auto loops: as and

when required

y Tools : Equip O&M staff with state-of-the-artdiagnostic tools. These tools allow O&M staff andmanagers to troubleshoot and detect malfunctions.

y Documentation: Useing effective documentation tomaintain continuity and reduce trouble-shooting costs.


7/18

DATA ACQUSITON SYSTEM

yWSPOSE BY BHELy PROCESS 1000 ANALOG AND 2000 BINARY

SIGNAL APPROXIMATLY AND DISPLAY IN USERFRENDLY FORMATE FOR OPERATION WINGSUCH AS TREND, GROUP DATA, PROFILE,

ALARM LOG, SHIFT LOG, DAY LOG,RETRIVALOF OLD DATA ON REQUEST ETC.


8/18

DAS

Schematic diagramTrendsAlarm logs


9/18

CONTROLy FURNACE SAFEGAURD SUPERVISORY SYSTEM

implement logics by NFPA for protection of furnace.

consists logic ofboiler MFR, Mill and PA interlock andprotection, flame scanners etc.

y ELECTRONIC AUTOMATION OF STEAM TURBINE

Takes care of protection of turbine, rolling to the speed

of 3000 rpm, synchronization, load control,Turbovisory parameters, coasting down in case oftripping and many more functions


10/18

CONTROLy DISTRIBUTED DIGITALCONTROLS

Heart of C&I system. It acquires various process

parameters , do signal conditioning and control thedesired parameters automatically.

Example: Furnace pressure control, drum level controlsand hundreds of other parameters.

Present system: Procontrol P-13At least 25 years old system & almost in obseletion stage


11/18

MODERANISATION: SWITCH OVER TO maxDNA

y HPBP and APRDS system of unit # 2 in 2005.

y Order For HPBP and APRDS system of unit # 1

already given and will be implemented in capital overhaul.y Complete changeover of EAST in one unit. PO placed

y Replacement of DDC and FSSS of one unit to maxDNA:enquiry placed to BHEL.

yPbased variable frequency Feeder control systeminstalled in U#2

y Same to be done in U#1 indent raised.

y Revival of SWAS in unit#1 to be carried out.


12/18

DDC

DDC panel


13/18

DDC


14/18


15/18

maxDNA


16/18

TRENDS ANDDISPLAY IN maxDNA


17/18

WORK FORCE

ESE C&I

EEE(C&I)-I SR. Engr-I

Engineer- 05

Technician- 07

Helper-10

EEE(C&I)II SR. Engr-II

Engineer - 01

Technician- 07

Helper-10


18/18

THANK YOU

control & instrumentaion

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