Crown Boiler MWC Series Specifications download pdf (Page 28)

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

v) When one half of the condenser is isolated, condenser shall be capable of

taking at least 60% T.G. load under TMCR conditions.

vi) The design capacity of each vacuum pump in free dry air under standard

conditions at a condenser pressure of 25.4 mm Hg (abs) and sub cooled

to 4.17

C below the temperature corresponding to absolute suction

pressure shall be demonstrated. Correction curves for establishing the

capacity at site conditions shall also be furnished.

vii) The air and vapour mixture from air cooling zone of condenser shall be

4.17

C below the saturation temperature corresponding to 25.4 mm Hg

(abs) suction pressure. Correction curves for establishing the same at site

conditions shall also be furnished.

viii)

Pressure drop across terminal points of condenser cooling system with

on line condenser tube cleaning system in operation.

5.4.17 Feed water heaters and deaerator

The following parameters shall be demonstrated:

i) TTDs and DCAs of feed water heaters shall be demonstrated as per

guaranteed heat balance diagram for 100% TMCR condition.

ii) Outlet temperature from final feed water heater(s).

iii) Difference between saturation temperature of steam entering the

deaerator and temperature of feed water leaving the deaerator shall be

demonstrated as per guaranteed heat balance diagram for 100% TMCR

condition.

iv) Continuous and efficient operation and performance of feed heating

plant without undue noise and vibrations at all loads and duty conditions.

5.4.18 HP & LP bypass system capabilities

The design capacity of HP/ LP bypass system shall be demonstrated. Further,

the HP & LP bypass system should satisfy the following functional

requirements under automatic interlock action. It should come into operation

automatically under the following conditions:

i) Generator circuit breaker opening.

ii) HP & IP stop valves closing due to turbine tripping.

iii) Sudden reduction in demand of external load (load throw off).

Applicable in case CW pumps are included in scope of BTG system.

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Crown Boiler MWC Series Specifications Page 28