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The Turbocharged Steam Injected Gas Turbine Cycle

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The Turbocharged Steam Injected Gas Turbine Cycle ( the-turbocharged-steam-injected-gas-turbine-cycle )

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Provision of an inlet to the combustor for the same air after further compression in the topping compressor and for the injected steam. Strengthening the combustor and expander casings for the higher pressure. 4. Strengthening the shafts and couplings, including a larger drive end bearing. 5. Adjustment of the thrust balance and cooling air. 6. Replacing the reduction gear and electric generator with higher rated units. 7. The addition of the topping compressor and its steam turbine. B. The addition of the heat recovery boiler and associated equipment. Table I lists the performance predicted at sea level and 60/. relative humidity for several single shaft gas turbines when converted to Turbo-STIG. For each engine the normal performance is listed first, followed by the performance calculated for the Turbo-STIG modified engine. The normal performance of the engines is obtained from specifications published in reference 7, except for the CW 251 which is from manufacturers" data. A calculation is made first to duplicate the basic performance. The performance of the engine in the Turbo-STIG configuration is then calculated using component efficiencies, pressure losses, etc. found to duplicate the basic performance. If the operating conditions of the components are significantly more arduous in the Turbo-STIG than normal operation, the values may be changed to reflect additional losses. The Turbo-STIG cycle for all the engines is similar to the CW 251 which is depicted on figure 1, unless stated otherwise. The efficiencies of the topping compressor and of its driving steam turbine are assumed in the range of 70-80 7, depending on size. An additional 27 pressure loss is assumed for the entry and exhaust ducts of the topping compressor. Comments on the engines listed in Tabl e I. Canadian Westinghouse 251 E+10. Figure 1. shows this engine in Turbo-STIG form.No regenerative version of the CW251 has been built but the 251 is derived from the CW191 and has spawned the CW352. Both the 191 and the 352 are made as regenerative engines, so no difficulties are expected in converting the 251 design for compressed air export and import. The power increase by the Turbo-STIG modification of the CW 251 is greater than for the other engines because of higher firing temperature. Asea Brown Boveri Type 8. BE

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