I doubt that there is a universal classification for this. Instead, you might need to look in the glossary that should be part of whatever local Code.

Thanks for interest and valuable suggestion

# 3 have following configration

Two Boilers each of 65 t/h,

One Unit of Condensing steam Turbine

One Unit of Generator

Yes I know that is why I answered. your cost will come Rs. 12.50/kwh.

You have not informed if you have any use of steam for process. With 2 sets condensing it is presumed you need no steam else extraction turbine x 1 set. The steam credit would have made your cost Rs. 8/kwh. All cost on imported coal 6200 kcal and 1 % sulphur.

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Please email at my new Email address duconems1 at the rate yahoo dot com.

a. At what temperature and Pressure Limits, the Boiler is classified wheteher it is Low temperature & Pressure,Medium temperature & Pressure or High Temperature & Pressure ?

As per ASME code, Boilers are classified into two basic classes

i. Low Pressure Boiler: Pressure is below 15 Psi

ii. High Pressure Boiler: Pressure is above 15 Psi.

High Pressure Boilers are further classified in to Sub Critical, Super critical and Ultra Super Critical

1. Sub-Critical (Operated around 19 Mpa):

Example: 170 bar, 540 C, Efficiency: 38 %

2. Super-Critical (Operated above 22.1 Mpa):

Example: 250 bar, 600/615 C, Efficiency: 42 %

3. Ultra Super-Critical:

Example: 300 bar, 615/630 C, Efficiency: 44 %

b.Which one among these three Boiler is more efficeint (interms of Operation and maintenance etc)?

1. 25 MW Power Plants Using Boiler - 1 or Boiler - 2

i. Steam in Kg / kWh around 3.9 to 4.0 at 6000 kcal / kg of Coal with 1 % Sulphur

ii. Net Thermal Efficiency of around 24 %

iii. Have high Cost of Boiler and Turbine due to high pressure

iv. Have long pay back opportunities

2. 25 MW Power Plants Using Boiler - 3

i. Steam in Kg / kWh around 4.5 to 5.0 at 6000 kcal / kg of Coal with 1 % Sulphur

ii. Net Thermal Efficiency around 22.5 to 22.8 %

iii. Have low Cost of Boiler and Turbine due to low pressure

iv. Better control over low electrical load equipments

v. Low initial Cost