Probabilistic approach: back pressure turbine for geothermal vapor-dominated system

6th ITB International Geothermal Workshop

Ahmad, Angga Alfandi^1 ; Guwowijoyo, Fransiscus Xaverius^1 ; Pratama, Heru Berian^1

Geothermal Engineering Study Program, Faculty of Mining and Petroleum, Bandung Institute of Technology, Jl. Ganesha No.10, Bandung

40132, Indonesia^1

关键词: Back-pressure turbines;    Design and calculation;    Geothermal wellhead;    Probabilistic approaches;    Turbine exhaust;    Turbine inlet pressure;    Vapor dominated systems;    Well productivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/103/1/012011/pdf
DOI  :  10.1088/1755-1315/103/1/012011

来源: IOP

【 摘 要 】

Geothermal bussiness nowadays needs to be accelerated in a way that profit can be obtained as soon as reasonable possible. One of the many ways to do this is by using one of geothermal wellhead generating unit (GWGU), called backpressure turbine. Backpressure turbine can be used in producing electricity as soon as there is productive or rather small-scale productive well existed after finished drilling. In a vapor dominated system, steam fraction in the wellhead capable to produce electricity based on each well productivity immediately. The advantage for using vapor dominated system is reduce brine disposal in the wellhead so it will be a cost benefit in operation. The design and calculation for backpressure turbine will use probablistic approach with Monte Carlo simulation. The parameter that will be evaluated in sensitivity would be steam flow rate, turbine inlet pressure, and turbine exhaust pressure/atmospheric pressure. The result are probability for P10, P50, and P90 of gross power output which are 1.78 MWe, 2.22 MWe and 2.66 Mwe respectively. Whereas the P10, P50, and P90 of SSC are 4.67 kg/s/MWe, 5.19 kg/s/MWe and 5.78 kg/s/MWe respectively.