Fig. 5
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DLE gas turbine fuel system representation DLE gas turbine ratio of main and pilot valve opening during operation.
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u 1 indicates the entire system of the main fuel valve and u 2 is the whole illustration of the pilot fuel valve. The main gas supply is the source for both systems as it goes to the main and pilot fuel manifold. The fuel flow from both valves is transferred to the gas injector and the mixture flows to the gas fuel engine. A relief valve also installed in the loop to prevent overpressure. From the representation, it can be justified that both valves are working parallel to each other for the ignition. The actual implementation of the available information to produce a DLE gas turbine fuel system is further explained in the Methodology Section.
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Methodology
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Table 1 Nominal values of DLE gas turbin.
Nominal Parameter | Unit | Values |
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Gross electrical output | MW | 5.67 |
Nominal frequency | Hz | 50 |
Turbine speed | RPM | 1500 |
Exhaust mass flow | kg/s | 21.77 |
Exhaust gas temperature | °C | 510 |
Pressure ratio | None | 11.11 |
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This study utilized 4.2 MW single shaft DLE gas turbine with a 12-stage axial compressor at Universiti Teknologi PETRONAS, Malaysia as a case study. The gas turbine operates as a cogeneration unit to produce electricity and chilled water for academic and operational usage. The nominal values are listed in Table \ref{ttps://www.authorea.com/users/227193/articles/433220-untitled-document?mode=edit#author-label-tab:1}, obtained from the gas turbine catalogue during the design stage.
Customarily, the nominal values will be diverged when the turbine installed at a different ambient condition. Table \ref{ttps://www.authorea.com/users/227193/articles/433220-untitled-document?mode=edit#author-label-tab:2} summarized the typical operating data from the power for the model development.
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Table 2 Typical operating data of DLE gas turbine.
Operating Parameter | Unit | Value |
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Output power | MW | 4.4 |
Turbine inlet temperature | °C | 1000 |
Exhaust gas temperature | °C | 532 |
Ambient temperature | °C | 27.3 |
Exhaust mass flow | kg/s | 438.1 |
Fuel flow | kg/s | 0.38 |
Lower heating value of fuel | kJ/kg | 48930 |
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As shown in Fig. \ref{ttps://www.authorea.com/users/227193/articles/433220-untitled-document?mode=edit#author-label-Fig6}, the model development starts with the data collection process. Healthy operational data in August 2016 are collected, which consist of 267804 samples. The samples are divided into a training dataset (50%), testing dataset (30%) and validation dataset (20%).