| The advantages of gas turbine are familiar by people, but there are some disadvantages with the simple-cycle, such as low-cycle-ratio and high emission pollution. So many developed countries are studying advanced cycle technology to improve the cycle ratio and enhance the partial-working economic and controlthe pollution emission. There is an advanced cycle-CRGT which can enhancethe ratio highly and reduce the exhausts.This paper depicted the basic theory of cycle in gas turbine, and analyzed the key factors related the cycle ratio. We compared the various advanced cycles, such as, and listed their differences. Under this condition, we put forward to the CRGT cycle.In this paper, the components of the CRGT cycle were construed. At the same time, the principles of the fuel-pyrolysis device and the basic theory of the pyrolysis were discussed and studied. We brought forward some dynamic models of alkanes' pyrolysis. According to this models, we calculated the thermal equilibrium in the pysolysis course, and gained the equivalent thermal value of the pyrolysis gas fuel.Basing on the thermal calculation and the stream quantity in the cycle, we had done the cycle-calculation of the gas turbine. The results shows that, it meets the needs of the fuel-pyrolysis device and the stream generator with the quantity heat included in the exhaust, and the temperature of the exhaust is dropped by several tens(K), and the thermal value of fuels is increased, and the power ratio of gas turbine is increased 20per, and the cycle ratio is increased 20per as well.With this work, it shows that a reasonable design of CRGT device will put the application of CRGT gas turbines to a wide perspective.
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