Register now or log in to join your professional community.
increase the firing temperature, reduce the clearances in the compressor, design the compressor blades in a way to optimize the efficiency, reduce the exhaust gas temperature
Efficiency improvements in gas turbine engines can be increased by minimizing the clearance between stationary and rotating parts, good cooling and reduce the temperature,prpoper maintenance, compressor wash and F.O.D Check
There can be multiple approach to this answer. Actually both turbine & compressor efficiency are interrelated as much as that a 1% efficiency gain in compressor can be considered as 2% gain in turbine efficiency as compressor consumes almost 2/3rd of total torque generated by the hot expanding gases.
Rather than suggesting turbine overhaul & other maintenance related aspects like blade tip clearance etc, I would suggest some Operation related measures which can be helpful.
1. Making a plan & performing Online waterwash on regular basis to keep the compressor blades clean & avoid accumulation & fouling by dust lying on blades for longer intervals. To decide upon the frequency, a fixed duration or interval based on compressor's adiabatic efficiency reduction can be considered. Whenever an opportunity is available, offline waterwash with inlet bellmouth hand cleaning is suggested.
2. Inlet air filter house condition plays a very important role as increased differential pressure directly translates to reduced compressor efficiency & hence turbine efficiency. Filter house pulsing to be maintained in good condition & monitored proactively. A increase of 5 mbar dp corresponds to almost 0.5% efficiency loss.
3. Efficient sealing to be maintained across Diverter & Guillotine dampers in case of combine cycle applications. Any flue gas leaking due to inefficient sealing, is direct loss of energy & hence less steam to STG & loss of MW.
4. Orifices in the sealing & purge air extractions from GT compressor to be checked at regular intervals as increased clearances might cause undue loss of air hence loss of efficiency.
etc.
I think the best to invite the manufacturing of the unit you working on to evaluate and answer.
the answer will be based on your unit specifically. In general go back to basic and think about Breyton cycle and how to increase the area under the curve
some ideas
Calibrating the IGV & waterwash?
checking the temperature curve with the manufacturing
is there a steam inlet in your unit?
In hotter climates can be improved by spraying a finely atomized water fog in front of the air filter house. This increases volumetric efficiency by artificially creating cooler and denser air.
In the other hand, to increase GT or compressor efficiency there are several ways to go, one of the most commonly approached is 3D aerodynamic design of blades and nozzles, and better materials developments.
Regular Maintenance is the first step for improving efficiency in any system , the efficiency can also be increased by making the system as simple as possible without making any unwanted complication in design. If the turbine is made with light weight materials and also by balancing the weight ratio of turbine and generator I think there might be a possibility in increasing the efficiency. We should also focus on the steam and see whether any unwanted waste might affect the turbine.
Hope its the answer of the question.
1 control the quality of turbine air fuel ratio
2 through HRSG or combine cycle system
By decreasing the inlet air temperature at compressor.
