A Research Of Fuel Reforming And Combustion Technologies In Gas Turbine Combustor

With the excellent thermodynamic properties, such as the large specific power output,thehigh thermal efficiency and the low emissions of pollutant, the Chemically Recuperated GasTurbine (CRGT) cycle has drawing more and more attention. Among them, using the exhaustthreads of gas turbine to proceed methane steam reforming is the core content of thisadvanced cycle, trying to seek appropriate reforming method and operating parameter hasvery important significance to improve the performance of CRGT cycle. Therefore, in thisarticle through the experiment and numerical simulation method, a series of methane steamreforming experiments is conducted, the pyrolysis gas combustion flowfield is analysised andthe dynamical model of plasma catalytic methane steam reforming is slao researched.The methane steam reforming test-bed is builded and the generator is designed in thispaper, the relevant experiments research about fuel reforming is also conducted. Under fourkinds of reforming form including catalyst reforming, plasma remorming, piecewisesynergistic reforming and apposition synergistic reforming, the influence of some factors likewater-carbon ratio, methane airspeed, temperature, discharge power and discharge frequencyto methane conversion and fuel calorific value increase rate are discussed as well. Theexperiment results are as follows: when add the plasma to the fuel reforming reaction, bothmethane steam reforming reaction and coupled reaction are occured in the reaction system.However, the coupled reaction can only improve the methane conversion and it can notalways improve the fuel calorific value increase rate. Besides the fuel calorific value increaserate of plasma remorming is increased with the increasing methane airspeed, the methaneconversion and the fuel calorific value increase rate of four kinds of reforming form areincreased with the increasing water-carbon ratio, the decrease methane airspeed, theincreasing temperature and the increasing discharge power. Besides the methane conversionof apposition synergistic reforming, generally speaking, the discharge frequency don’t hasmany affects on the methane conversion and the fuel calorific value increase rate of four kindsof reforming form. On the other hand, in the same parameters, the methane conversion andthe fuel calorific value increase rate of four kinds of reforming are apposition synergisticreforming, catalyst reforming, piecewise synergistic reforming and plasma remorming by descending order.A model of electron collision reaction is established by solving the Boltzmann equation,according to the characteristic of plasma catalytic methane steam reforming reaction, a modelof heavy particle reaction is also established by consulting document, then the originaldynamical model of plasma catalytic methane steam reforming is established. Using thePlasma PSR model of CHEMLIN, a numerical simulation based on this dynamical model isconducted and the relationships between residence time and every components’ mole fractionis obtained, furthermore, the original dynamical model is also modified by the experimentdata. Finally, a vicarious dynamical model of plasma catalytic methane steam reformingwhose results match with the experiment data well in a particular situation is established.When the combustor inlet enthalpy value is constant, a numerical simulation research ofcatalyst reforming pyrolysis gas combustion, plasma remorming pyrolysis gas combustion,piecewise synergistic reforming pyrolysis gas combustion, apposition synergistic reformingpyrolysis gas combustion and methane combustion based on the Realizable k-ε model andprobability density function (PDF) are conducted. The calculation results show that when thecombustor inlet enthalpy value is constant, taking the highest temperature in combustor, thelargest unevenness of outlet, the wall temperature and total pressure recovery coefficient intoaccount, the pyrolysis gas combustion performance of the catalyst reforming is the best.