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When we comes to the term of the amount of steam required to produce 1 MW of electricity, it needs to consider so many factors, the most important being, the steam temperature and pressure at the exit of boiler, the isentropic efficiency of turbine, the availability of reheat, the condenser pressure and whether or not any feed water heaters are employed. And generally around 3 t/h steam is used to generate 1MW from a steam turbine. The actual value would vary depending on the cycle parameters such as temperature, pressures, extractions, and condenser parameters.
Take an example, the steam temperature and pressure at the exit of the boiler is Temperature and Pressure, let the isentropic efficiency of Turbine = x%, the condenser pressure is Pressure and no feed water heaters are employed.
To determine the enthalpy and entropy of steam at the exit of boiler (i.e. the inlet of Turbine), simply refer to the steam tables and define them, let them be h and s. Then for the fixed value of isentropic efficiency and the condenser pressure, define the enthalpy at the exit of Turbine. This enthalpy difference when compared with the net power output gives the mass flow of steam required to produce the said power. The thing to note is the 1MW power is an electric power generated by the plant, the enthalpy difference will give you the energy that can be extracted from the turbine, so be assuming the generator efficiency of y (around 90–95), the accurate results can be obtained.
ZG Boiler is the industrial boilers manufacture in China and we have more than 72 years’ history and we design and manufacture oil & gas power plant boiler, biomass fired power plant boiler, coal fired power plant boiler, CFB power plant boiler, waste heat boiler for electricity. And if you want to know the steam consumption for 1 mw of electricity, you cna tell us the detained parameters and we can estimate the steam consumption of each fuel.