Back pressure turbine
A back pressure turbine is a steam turbine in which the exhaust steam is not expanded down to the negative pressure range, as is the case with a condensation turbine , but only down to the overpressure range, in which the exhaust steam is withdrawn overheated .
Backpressure turbines are mainly used in thermal power stations with cogeneration used when steam is required in large and constant amount as heating, z. B. in combined heat and power plants for district heating or in industrial power plants to generate process steam for a production process.
Is the amount of steam required in relation to the live steam flow low or highly variable, so it is more economical to provide a condensing turbine and the heating steam from a removal deducted. Otherwise, excess steam has to be condensed at high pressure, which would result in poor efficiency due to the high residual energy .
Most high and medium pressure turbines are back pressure turbines, as they transfer the steam in the overpressure range to the low pressure turbine, which is usually a condensation turbine .
The term back pressure turbine is also used less often for gas turbines (e.g. upstream gas turbines ) or water turbines.
Individual evidence
- ↑ MAN, page 6 ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (PDF file; 2.6 MB); accessed on 10 XII 2012
- ↑ [ Archived copy ( memento of the original from March 26, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. ]; Retrieved February 1, 2013
