HBK4 focusses on the full load operation of heavy duty combustion systems. The burners of the largest gas turbine in the world were tested in this test bed. All supply systems for air, fuel and cooling water as well as the back pressure valve and the stack are designed for high load testing. A state of the art Emission measurement system for all relevant species and also Temperature and pressure measurement systems are available.
To simulate the engine’s compressor, air is pressurized using intercooled high pressure compressors. The air is preheated using the NG powered air preheaters and then supplied to the test setup. The required fuel is introduced into the combustor and the exhaust mass flow is released to the stack. To simulate the pressure drop of the engines turbine, a hydraulic backpressure valve (exclusively developed for DLR) is used.
To guarantee full fuel flexibility, the HBK4 is connected to the natural gas facility (for H-Gas and L-Gas), the liquid fuel facility (for Kerosene, fuel oil or any special liquid fuel available) and the syngas facility. The Syngas facility is designed to provide the combustor with any type of gaseous fuel imaginable. The composition (made up from H2, CO, N2, CH4, CO2, C3H8, C2H6, C4H10 and others) can be adjusted online to simulate flare gas, mine gas, landfill gas or any other waste gas.
The test setup is supplied with cooling water for the pressure casing, the hot gas parts and the emission probes. If required, quench cooling and emulsion water (for liquid fuel operation) are also available.