New technology based on the Allam cycle with intra-cycle coal gasification

RELEVANCE. Development of a new technology based on the Allam cycle with incycle coal gasification. THE PURPOSE. Determine the thermal efficiency of the Allam cycle with in-cycle coal gasification. Calculate the synthesis gas combustion process. Consider the provisions of thermodynamic analysis of energy cycles. Compare the considered technology with other technologies of electric power generation on organic fuel. METHODS. The method for calculating the synthesis gas combustion process consists in determining the mass-flow characteristics of the fuel, oxidizer, working fluids and thermal efficiency, which allows comparing the considered technology with others. In the proposed method, it is assumed that pure synthesis gas is burned at a stoichiometric ratio of the supplied oxygen. Limitations of the presented method are the thermodynamic parameters of the input, which will determine the enthalpies of the working fluid and water vapor at the calculated points, as well as the ambient temperature, on which the pressure at the outlet of the CO2 turbine will depend. RESULTS. The article proposes a method for determining the thermal efficiency of the Allam cycle with in-cycle coal gasification. The method is based on the calculation of synthesis gas combustion and the provisions of thermodynamic analysis of energy cycles. Using the developed method, the thermal efficiency of the electricity generation technology based on the Allam cycle with incycle gasification of Kuznetsk coal in the Texas process is analyzed. The considered technology is compared with other technologies for generating electricity on organic fuel. CONCLUSION. It was calculated that the synthesis gas consumption for the considered technology is approximately 4.3 times higher than for the Allam cycle with oxygen combustion of methane. It is shown that the proportion of working fluid renewal for the technology based on the Allam cycle with in-cycle coal gasification is 1.6 times higher than that of a similar CO2 cycle on methane. It is shown that the thermal efficiency of the technology is 65.5%, which is comparable with similar technologies of different architectures.

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