Crown Boiler MWC Series Specifications download pdf (Page 32)

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

ii) The following correction curves shall be applicable for performance test

of the ESP:

a) Inlet flue gas flow.

b) Inlet flue gas temperature.

c) Inlet dust loading.

d) Sulphur content of coal.

5.5.3 Auxiliary power consumption

The unit auxiliary power consumption shall be calculated using the following

relationship:

Pa = Pu + TL

Pa = Guaranteed Auxiliary Power Consumption.

Pu = Power consumed by the auxiliaries of the unit under the test.

TL = Losses of the transformers based on works test reports.

While guaranteeing the auxiliary power consumption, all continuously

operating unit auxiliaries shall be included and number of coal mills to be

considered in operation shall be as per requirement of design coal.

5.5.4 Performance/ acceptance test for turbine generator

i) Performance test for the turbine generator set will be conducted in

accordance with the latest edition of ASME PTC-6.

ii) Power consumed by the integral auxiliaries mentioned which is to be

deducted from electrical power generated, shall be measured during the

performance/ Acceptance Test. Wherever the measurement is not

possible, design values of power consumption by an auxiliary shall be

considered.

iii) Corrections to the test results for steam turbine shall be applied as per

the correction curves provided. When the system is properly isolated for

a performance test, the unaccounted for leakages should not be

more than 0.1% of the design throttle flow at full load. However, during

the test, if it is found that the unaccounted for leakage is more than 0.1%

of design throttle flow at full load, then heat rate will be increased by an

amount equal to half the difference between actual unaccounted for

leakage expressed as percentage of design throttle flow at full load and

0.1% (allowed by the code). In case excessive leakage is visible in the

plant area, the source of leakage shall be identified and attended before

commencement of the test.

iv) The tests shall be arranged in a manner that the normal unit operation is

not disrupted. Duplicate test runs shall be performed at 100% TMCR

and 80 % TMCR loads. The results of corrected heat rate shall agree

within 0.25% and average of two shall be considered heat rate achieved.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 221 222

No comments

Crown Boiler MWC Series Specifications Page 32