Crown Boiler MWC Series Specifications download pdf (Page 90)

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units

CHAPTER- 10

ELECTROSTATIC PRECIPITATOR

10.1 Design Data

The electrostatic precipitator(s) (ESP) of each unit shall be arranged in

minimum four (4) independently operating gas streams (casings) for 660 MW

unit and six (6) independently operating gas streams (casings) for 800 MW

unit. Each gas stream/ casing shall be provided in twin compartments. ESP

shall be designed to comply with the requirements stipulated under ‘guarantee

point’ and ‘design point’ in the table below:

Sl.

No.

Item Guarantee point Design point

i) Unit loading 100% TMCR 100% BMCR

ii) Type of coal Design coal Worst coal (maximum

ash coal from range)

iii) Ambient air condition 27

C temp. and 60%

iv) Gas flow per steam

generator at the ESP

inlet when firing

respective coal (m

/sec)

To be worked out

when firing the

specified design coal

at TMCR.

To be worked out

when firing the

specified worst coal

with max. ash at

BMCR load,

considering 25%

excess air at

economiser outlet,

15% air heater in

leakage and 2% duct.

v) Gas temperature at ESP

inlet (

125

C or as predicted

under conditions

stipulated above,

whichever is higher.

140

C or as predicted

under conditions

stipulated above,

whichever is higher.

vi) Inlet dust burden

(gm/Nm

)

To be worked out

based on 85% of ash

or actual predicted

whichever is higher

being carried forward

to ESP while firing

specified design coal.

To be worked out

based on 85% of ash

or actual predicted

whichever is higher

being carried forward

to ESP while firing

specified worst

(maximum ash) coal.

vii) No. of electrical fields

out of operation

One each in all the

passes

One each in all the

passes

viii) Outlet dust burden

(mm/Nm

)

50 mg/Nm

(maximum) or as per

MOEF’s requirement

whichever is more

80 mg/Nm

(maximum) or as per

MOEF’s requirement

whichever is more

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Crown Boiler MWC Series Specifications Page 90

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