Where do you use the Back pressure Turbines?
Back pressure steam turbines are widely used in sugar mills, distilleries, paper plants, chemical industries, captive power plants and other process industries where both electricity and process steam are required.
Unlike a condensing steam turbine, which expands steam to a very low pressure and rejects heat in a condenser, a back pressure turbine exhausts steam at a useful pressure. This exhaust steam is then supplied to process equipment for heating, evaporation, drying or other industrial applications.
How does the Power develop in Back pressure Turbines?
Calculating the power generation of a back pressure steam turbine is relatively straightforward when the steam flow rate and the inlet and exhaust steam conditions are known. The basic principle is that the turbine converts the enthalpy drop of steam into mechanical energy, which is then converted into electrical energy by an alternator.
What is the Basic principle of Power generation in Steam Turbines?
team contains thermal energy, represented by its specific enthalpy. When high-pressure steam enters a turbine and expands to a lower pressure, its enthalpy decreases. The difference between the inlet enthalpy and exhaust enthalpy represents the energy theoretically available for conversion into turbine work.
What are the Inputs required for the Calculation of Power Generation?
Inputs required for the Calculation of Power Generation
- Turbine Inlet steam FLow
- Turbine Exhaust steam flow
- Inlet steam parameters mainly pressure and Temperature
- Exhaust steam parameters
Other parameters include Gear box efficiency and Alternator efficiency
Turbine Power = Steam Mass Flow × Enthalpy Drop / 860
Where, 1 KW = 860 kcal/kg
Electrical Power = Steam Flow × Enthalpy Drop × Gearbox Efficiency × Alternator Efficiency / 860
A steam Turbine is operating at 40 TPH inlet steam flow at Pressure 65 Kg/cm2 nd Temperature 485 Deg C The steam is being exhausted at Pressure 3.5 Kg/cm2 and 200 DegC temperature, Calculate the Power generation considering efficiency of Gear box and alternator 100%.
Turbine Power = Steam Mass Flow × Enthalpy Drop / 860
Enthalpy of steam at Pressure 65 Kg/cm2 and Temperature 485 deg C = 804 Kcal/kg
Enthalpy of steam at Pressure 3.5 Kg/cm2 and Temperature 200 deg C = 685 Kcal/kg
Therefore Power generation on Turbine shaft = 40 X (804-685) / 860 =5.53 MW
Back Pressure Turbine Power Calculator
Steam Flow
Turbine Inlet Steam Conditions
Turbine Exhaust Steam Conditions
Calculation Results
Power (MW) = [Steam Flow (kg/hr) × Enthalpy Drop (kcal/kg)] ÷ 860,000
Turbine efficiency = 100%
Generator/Alternator efficiency = 100%
Therefore, the result represents theoretical power generation based only on the calculated steam enthalpy drop.
Steam enthalpy is estimated automatically from pressure and temperature using saturation-temperature interpolation and superheat calculations.