PRESENTATION ON GNDTP.pptx

8/10/2019 PRESENTATION ON GNDTP.pptx

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By:-

Kanu Priya (90500414006)

Kavita (90500414007)


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The G.N.D.T.P. units are primarily

coal-fired units and the coal

consumption at maximum continuous

rating (M.C.R.) per unit is about 58

T/Hr. the coal used at G.N.D.T.P. is of

bituminous and sub-bituminous type.

Coal is transported from the coalmines to the plant site by Railways.


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In order to unload coal from the wagons, two

Roadside Tipplers are provided. Each iscapable of unloading 12 open types ofwagons per hour. Normally one tippler willbe in operation while the other will be

standby.


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There are two crushers each driven by electric

motor. The maximum size of the crushed coal is

50mm. One crusher works at a time and theother is standby. The coal is fed to the coal mill

through conveyor belt.


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Each mill consists of single compartment drum

bearings, driving motor, coal inlet anddischarge piping balls and lubricating

equipment for mill bearings. There are three

types of steel balls present in each coal mill.


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It is a single drum, balanced draught, natural

circulation, reheat type, vertical combustionchamber consists of seamless steel tubes on all

its sides through which water circulates and is

converted into steam with the combustion of fuel.


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The turbine is the prime mover for thegenerator in the power plant Different types ofsteam turbines used in thermal power plants.Three main sections of a turbine are:-

1. Low pressure (L.P.)

2. Medium pressure (M.P.)

3. High pressure (H.P.)
http://localhost/var/www/apps/conversion/tmp/scratch_1//upload.wikimedia.org/wikipedia/commons/5/5a/Turbine_power-plant_hg.jpg


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Cooling towers aremassive Ferro-

concrete structure

having hyperbolic

profile creatingnatural draught of

air responsible for

achieving the

cooling effect.Cooling tower is as

high as 40 storey

building.


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Switch yard is a section whereelectricity generated at 11 KV by the

turbo-set is stepped-up by unittransformers to 132/220 KV for furthertransmission through high tension linesto different cities.


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a) Power Transformer b) Auto Transformer


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c) Unit Auxillary d) Station Transformer

Transformer


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Dust extractions from industrial gases

become a necessity for environmental

reasons. Most of the plants in India use

coal as fuel for generating steam. Theexhaust gases contain large amount of

smoke and dust, which are being

emitted into atmosphere. This poses a

real threat to the mankind as a desertinghealth hazards. Hence it has become

necessary to free the exhaust gases

from smoke and dust.


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The Electrostatic precipitator utilizes electrostaticforces to separate the dust particle form the gasto be cleaned. The gas is conducted to achamber containing Curtains of vertical steel

plates.


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The hoppers are sized tohold the ash for 8 hrs.collection. Buffer platesprovided in each hopperto avoid gas leakage.Inspection door isprovided on the one sideof hoper wall.Thermostatically

controlled heatingelements are arranged atthe bottom portion of thehopper to ensure freeflow of ash.


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Rapping mechanism is provided for collecting and

emitting electrodes. Geared motors drive the

rapping mechanism. The rapping system employstumbling hammers, which are mounted on a

horizontal shaft


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The rectifier supplies the power for ash

particle charging and collection. The basic

function of the EC is to feed the precipitator

with maximum power input under constantcurrent regulation.


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The ACP houses the power and circuitsrequired for energizing rapping motor andheating elements of the precipitator. ACPcontrols each gas path. The complete ACP is

of modular type with individual module foreach feeder. ACP equipments are:-

1. C.R.M.

2. E.R.M.

3. Hopper heater

4. Shaft heater

5. Rapping programmer etc.


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The control units present in E.S.P. are:-

a) EPIC-II & Bepcon sigma- These aremicro processor based units for regulation

and control of the electric power input to

ESP.

b) RTU- RTU is an all purpose unit for using

with all field bus based control equipment

such as ESP. All dater and window

displays are retrieved from the EPICcontroller with which the RTU

communicates.


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The apparatus including its associatedauxiliaries employed for switching, controlling

and protecting the electrical circuits.

The input supply taken by switch gear is132KV with which it charges its two buses

one of 6.6KV and other of 415V.


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Major portions which are controlled

through switch gear are:-1. I.D. Fan

2. F.D. Fan

3. P.A. Fan4. U.A.T

5. C.W

6. B.F Pump

7. C.E Pump

8. Power transformer


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Basic aim of instrumentation is to achieve safety,quality reliability and remote automation

operation of the process. The major parameters

installed at GNDTP are as follow:-

Temperature

Pressure/Vacuum

Level

Flow


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Recording and controlling temperatures are

important in design, fabrication, operation andtesting of power generation and utilizing

equipment and associated apparatus.

a) Local instruments b)Remote instruments

Thermocouple


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Bourdon tube- It consists of a tube of oval

section and of suitable material bent in the form ofa circular arc. The open end through witch fluids

or gases are admitted is fixed and the closed end

is free. The free end is connected to a pointer

through link mechanism to magnify the tipmovement.


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Level in various tanks, heaters and at or

vessels is measured in thermal

powerhouse for indication and as well as

for tripping and alarm switches.


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Orifice plates

Flow nozzles


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To meet the requirements of the extremely

varied environment data text, voice andacceptance of a wide variety of terminals,

advanced telephone stations, machines etc.

communications system has been designed.

DIGITAL CODING-DECODING OF SIGNAL

Digital coding of speech implies coding each

signal sample in the form of bits, to the circuit

used. Digital decoding implies the separation of analog

signal from signal sent over the line to the

transmission channel.


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DISPLAY FUNCTIONS

The purpose of the display is to inform the user

concerning the telephone environment and indicatesterminal status.

LED FUNCTION

As a rule, any LED associated with a functional key willindicate the status of this key:-

LED OFF : function inhibitedLED on : function carried out

LED flashing : specific function

PROGRAM KEY FUNCTION

Speed call keyTransfer key

Conference key

Ring again key

Mute key


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PRESENTATION ON GNDTP.pptx