The coal gasifier, gas turbine, combined cycle is a superior baseload electric generating system. It promises lower fuel cost, lower operating and maintenance cost, and superior siting and environmental characteristics over conventional steam systems with flue gas clean up and fluidized bed combined cycle systems. Two major new components are required: 1) the coal gasifier, and 2) the baseload gas turbine. Several candidate gasifier systems are emerging from development for other applications. Existing gas turbines primarily reflect characteristics of peaking power units. Application of such design philosophies to the demanding performance and durability requirements of baseload operation is questionable. The baseload gas turbine must be designed with the high reliability, high availability, low maintenance characteristics associated with steam turbines. This paper summarizes United Technologies Corporation's investigation of a new gas turbine designed specifically for baseload service with a coal gasifier fueled combined cycle. The design of this machine results from a cooperative effort by Kraftwerk Union, United Technologies Corporation, and Electric Power Research Institute. Need for a Baseload Gas TurbineThe gas turbine combined cycle, fueled by a coal gasifier, is a superior "coal-fired" central station, baseload electric generating system. This is the conclusion of many studies which have examined the question of how the world's abundant coal reserves can be most wisely used. Compared to conventional and near-term generating systems, the coal gasifier gas turbine combined cycle emerges as having the best combination of efficiency, cost, environmental and siting characteristics.One approach to a coal gasifier gas turbine-based system is shown schematically in Fig. 1. It consists of a coal gasification and gas clean-up subsystem integrated into a gas turbinesteam turbine combined cycle to maximize the utilization of thermal energy throughout the entire system. The combined cycle can operate on any liquid or gaseous fuel. Efficiencies can be achieved in the order of 50 percent by the combined cycle system without the gasifier. These superior conversion efficiencies, obtainable with conventional equipment, are the primary reason the gas turbine based system with the coal gasifier promises to be the next standard baseload fossilfueled electric generating system. Key advantages of the system are summarized in the following paragraphs.

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This report provides the basis for a program to Investigate the characteristics of Ranklne space power plants In the zero gravity aspect of the environment of space. It justifies the need for this work by presenting the expected effects on Ranklne space power plants. Discussions of experimental techniques for studying these phenomena show that this Information can be obtained rapidly and economically. Recommendations for a program to supplement SNAP II and similar Ranklne space power development efforts In this vital area are made, and consist of: 1) the development and testing of a small system that adequately simulates a complete Ranklne system, first In zero gravity and finally. In the complete orbital environment; followed by, 2) the development and similar testing of a complete Ranklne system using SNAP II hardware.

Mukes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usefulness of the information contained i n this report, or that the use of any information, apparatus, method, or process disclosed i n this report rnuy not infringe privately owned rights; or Assumes any liabilities with respect to the use o f or for damages resulting from the use of information, apparatus, method, or process disclosed i n this report.?. As used in the above, "person acting on behalf of the Cornmission" includes any employee or contractor of the Commission to the extent that such employee or contractor prepares, handles or distributes, or provides access to, any information pursuant to his employment or contract with the Commission.

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