Abstract
To research the fuel-switching rules for gas turbine dual-fuel combustor, the effects of fuel change rate, fuel compensation rate, permissible fluctuation limit of outlet temperature, and fuel matching on the fuel-switching performance were studied experimentally by using a real dual-fuel gas turbine combustor. The experimental results show that increasing fuel change rate can reduce fuel-switching time, but the influence of fuel viscosity and evaporative atomization combustion hysteresis leads to the increase of outlet temperature amplitude fluctuation. The fuel compensation rate corresponds to the optimal solution for this combustion chamber; when the fuel change rate decreases, the optimal fuel compensation coefficient will be increase. Meanwhile, by increasing the allowable fluctuation range of outlet temperature and reducing the difference of calorific value of natural gas and diesel, the fuel-switching time can be effectively reduced, and the fuel-switching stability can be improved.
Highlights
With the development of The Times, the engine has new requirements for fuel adaptability
As a nonsteady working process of the combustion chamber, the main problems of fast fuel-switching technology are as follows: When the gas turbine is switching between different fuels fastly, the flame in the combustion chamber may be unstable due to the mismatch of the different fuels, leading to ablation of turbine blades or dual-fuel nozzles in the combustion chamber
Load performance tests were carried out on the Siemens SGT750 gas turbine combustor; the results show that the liquid fuel injection atomization and the change of the calorific value of gas fuel on the performance of dual-fuel combustor is the key direction of dual-fuel combustor research at present (Lindman et al, 2014; Lindman et al, 2017)
Summary
With the development of The Times, the engine has new requirements for fuel adaptability. As a nonsteady working process of the combustion chamber, the main problems of fast fuel-switching technology are as follows: When the gas turbine is switching between different fuels fastly, the flame in the combustion chamber may be unstable due to the mismatch of the different fuels, leading to ablation of turbine blades or dual-fuel nozzles in the combustion chamber. Sometimes, this situation can result in combustion chamber blowout or overheating. How to shorten the fast fuel-switching time while maintaining the fixed position of flame (or the average temperature at the exit of the combustion chamber) and the stability of the flame (the dynamic pressure value in the combustion chamber) is the key of the research on the fast fuel-switching of the dual fuels combustor
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