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Figure 8. GE Power Systems chart showing advances in both firing temperature and efficiency.22 Other Advances Although material enhancements and cooling evolutions were the main gas turbine technological improvements, R&D did lead to other engineering advances as well. These include the adaptation of steam injection into gas turbines, which first occurred in 1984. This process injects steam from the Heat Recovery Steam Generator (HRSG) into the gas turbine combustor. The high pressure steam is heated, expands in the gas turbine, and boosts power output. Another new advancement was ABB’s unique use of sequential combustion (or reheat) which produced some of the benefits of high-temperature firing without causing the same level of thermal damage or the same NOx levels which result from the more simple type of high temperature combustion.23 In explaining this advancement, it should be noted that Brown Boveri’s closed its own gas turbine business in the mid 1980s because of the slump in the gas turbine market. When it merged with Asea in 1988 to become ABB, it immediately began a brand new development program which was relatively independent from past programs because of the complete break in the business. In addition, ABB hired some key engineers who had previously worked for GE. 22 Data provided by Joel Haynes, GE 23 Interview with Craig Tedmon, ABB. 16PDF Image | Energy RD Performance: Gas Turbine Case Study
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