Main Steam Pressure Calculation in Boiler

The pressure necessary to drive(force) the load. If your spinning a turbine.... the load on the turbine and the efficiency of the cycle from steam to condensate(energy converted to work).

Include system demand (how fast will you need to go to keep up ).suppose you are driving a 400 # force through a 2 inch valve? will you loose speed going uphill... if you slow down the turbine will the enduser notice?

-need more information-

Banu...

This forum is in English, so the proper word selection and usage become important.

I am assuming that you are interested in how the Main Steam pressure is SELECTED (not calculated)in a thermal power plant.

The selection process begins with a heat balance and cost analysis of a proposed plant. The best Main Steam pressure is the one that will produce that most power with the turbine generator configuration selected.

Of course, both boilers and steam turbines can be operated at conditions less than the maximum allowed. The maximum allowed pressure for a steam boiler is commonly called the MAOP. The main steam piping design pressure (MAWP)is typically sat at this value.

I do not believe that there is a direct correlation between main steam pressure and MWe for a thermal plant.

My opinion only

-MJC

As said before in #2 comment:

The Steam pressure of an installation is decided after looking at several options related to the availability of equipment, financial considerations and all the consequences for using higher pressures.

Using higher pressures will, theoretically allow the steam to carry more energy for the same quantity at a time. The pressure drop is greater hence more energy will be collected...

I don't know if any of the contributors has been involved in such project at the early stages when selection is made. Most important is the long term efficiency of the system and how economical it will be to build given the existing technologies.

I agree professor..... the nuts and bolts of economics

hi, A steam turbine is used to extract energy from the working fluid(Steam) and use it to do work in the form of rotating the turbine shaft. The work done by the steam is equal to the enthalpy drop in the steam. To increase the power we have to increase the input enthalpy value which can be done by increasing the main steam pressure. But i don't know the calculation between power and main steam pressure.