Improve Steam Turbine Efficiency - Effect of Steam inlet temperature PDF Print E-mail
Written by IFFCO   
Friday, 02 July 2010 09:13
Article Index
Improve Steam Turbine Efficiency
2.1 Effect of Steam inlet pressure
Effect of Steam inlet temperature
Effect of exhaust pressure/ vacuum
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2.2    Effect of Steam inlet temperature

Enthalpy of steam is a function of temperature and pressure. At lower temperature, enthalpy will be low, work done by the turbine will be low, turbine efficiency will be low, hence steam consumption for the required output will be higher. In other words, at higher steam inlet temperature, heat extraction by the turbine will be higher and hence for the required output, steam consumption will reduce. Figure - 4a & 4b represents the effects of steam inlet temperature on steam consumption and turbine efficiency respectively, keeping all other factors constant for the condensing type turbine.

Fig 4a : Effect of steam temperature on steam consumption in condensing type turbine

Fig    4b    :    Effect of steam temperature on turbine efficiency in condensing type turbine

Figure - 4a & 4b indicates that increase in steam inlet temperature by 10 deg C in condensing type turbine reduces the steam consumption in the turbine by about 1.1 % and improves the turbine efficiency by about 0.12 % respectively.

Fig 5a : Effect of steam temperature on steam consumption in back pressure type turbine

Fig 5b : Effect of steam temperature on turbine efficiency in back pressure type turbine

In case of back pressure type turbine increase in steam inlet temperature by 10 deg C reduces the steam consumption in the turbine by about 1.5 % and improves the turbine efficiency by about 0.12 % as shown in figure - 6a &6b. Improvement in back pressure type turbine is more than the condensing type turbine.



 

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