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FIGURE 2. Allam cycle P, h diagram [2] 1. SPECIFIC FEATURES OF THE ALLAM CYCLE GAS TURBINE DESIGN The counter-pressure gas turbine is the Allam facility central element. In terms of the very high inlet pressure, it is similar to the R-100-300 HTGZ steam turbine designed in 1964 for the initial pressure of 300 bar and temperature 650°C. In terms of the 1100 - 1200°C inlet carbon dioxide temperature, it is similar to current gas turbines. Thus, the turbine housing design may employ the steam turbine experience and the flowpath design may use the gas turbine specific solutions. At the high initial temperatures, the turbine housing parts may be manufactured out of very expensive chromium-nickel alloys, so the turbine dimensions should be as small as possible. In other words, the number of turbine stages should be minimal. This problem may be solved with the following considerations. The maximal stage internal efficiency may be reached at the following available enthalpy drop , of the stage: (1) - stage kinematic parameter, that 2 D2 n2 H i . Here – stage mean diameter, n – rotational speed, 0i 2 x2 a determines its efficiency (velocity ratio), – blade speed at the stage mean diameter. The velocity is equivalent to the total available enthalpy drop , or . In active stages the optimal parameter value is , in reactive stages 0,65 . According to the equation above the optimal stage enthalpy drop intensively grows at the stage mean diameter increase. Therefore, this diameter mostly determines the turbine number of stages. The diameter increase at constant fluid massflow G inevitably shortens the vanes and blades height. The vane height may be calculated as the following: (2) 020026-3PDF Image | Supercritical CO2 gas turbines for high-power generation
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