Steam Turbine Case Study

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Figure 3.3Back pressure steam turbine (C.B. Oland: Oak Ridge National Laboratory (ORNL) 2004) • Condensing steam turbines exhaust either complete or part of the steam to the condenser. Straight condensing steam turbines are used mostly for only generating power, owing to its design and those turbines exhaust all of the steam to the condenser as illustrated in Figure 3.4. Therefore straight condensing steam turbines are not applicable for CHP systems (C.B. Oland: Oak Ridge National Laboratory (ORNL) 2004). • Another condensing steam turbine system known as extraction condensing steam turbine which can provide exhaust steam to the process or feed water heating owing to extra opening in the housing. Depending on the specific demand of steam …show more content…

Maintenance Steam turbines are very reliable with long operational life. Periodic maintenance is very easy and contains mainly of ensuring that all fluids (steam flowing through the turbine and oil for the bearings) are clean and appropriate temperature with low moisture level. Oil lubrication system needs to operate accurately and clean. In order to avoid corrosion, system needs to be maintained with right feedwater and steam chemistry (ONSITE SYCOM Energy Corporation 2001). A possible maintenance problem about steam turbines is that solids can be transferred from boiler and precipitate on turbine nozzles and other inner side of steam turbine. These precipitations sometimes cannot be soluble in water and lower the efficiency of turbine and power output. In order to remove such precipitations, different kinds of approaches are found such as manual removal, cracking precipitations by shutting the turbine down and leaving it to cool and to remove water soluble precipitations, steam turbine needs to be washed with water during running. In the steam power system, steam stop valve has very important role for the steam turbine life. Steam stop valve is placed ahead of the steam turbine to monitor the temperature and pressure of the steam supply. Importance of this steam stop valve is essential because if generator power load is lost, steam turbine can quickly over speed and become unusable. Maintenance cost of the steam turbines are generally below 0,01 € / kWh (C.B. Oland: Oak Ridge National Laboratory (ORNL)

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