NUMERICAL MODELING AND SIMULATION OF A GAS TURBINE COMBUSTOR FOR HYDROGEN CO-FIRING ANALYSIS

• Main Author: Shofar Fauzi, Hadits
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87256
• Institution: Institut Teknologi Bandung

The global increase in greenhouse gas emissions has driven mitigation efforts through the Paris Agreement, followed by Indonesia's commitment to reducing carbon emissions under its Nationally Determined Contributions (NDC). In the transition to renewable energy (RE), gas turbines remain essential as a reliable energy source to address the intermittency of RE systems. Consequently, decarbonizing gas turbine power plants has become a critical agenda, with one promising solution being hydrogen co-firing as a low-carbon fuel. This study models and simulates the combustion of hydrogen-natural gas co-firing in the M701F4 gas turbine combustor at Tanjung Priok, with hydrogen mass fractions varying from 7% to 20%. The combustor geometry includes a 0.3 mm deviation, based on point cloud 3D scan data. The simulation results indicate that adding hydrogen increases the Turbine Inlet Temperature (T1T) to 1,583.53°C, triggers hot spot formation near the combustor swirler, and raises flow velocity by >4%. This also enhances the combustion enthalpy, theoretically increasing power output from 261.69 MW for 100% natural gas to 350.76 MW for 20% hydrogen by mass. Additionally, hydrogen reduces carbon dioxide (CO?) emissions from 4.25% to 3.25% but raises nitrogen oxides (NOx) emissions from 233.98 ppm to 385.17 ppm. Economically, hydrogen utilization increases the cost burden of component C by ±1.72 times compared to natural gas. However, leveraging carbon credit values reduces the cost to 1.63 times. These findings demonstrate hydrogen’s significant potential for decarbonizing gas turbines, despite challenges such as increased NOx emissions and the need for comprehensive economic evaluation for practical implementation.