New Technologies Of Synthesis Gas Compressor Drive Steam Turbines For Increasing Efficiency And Reliability.
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Recently, synthesis gas compressor drive steam turbines have required upgrading to increase efficiency and reliability for saving both operation and maintenance costs in many ammonia plants. This paper introduces the latest practical technologies to achieve very high performance. Examples include a highly unique assembly of integral shrouded blades, a new profile design procedure for both fluid loss reduction and increased strength against high-speed and high-stage power. Finite-element and computational fluid dynamics analysis results of new blades and nozzles are discussed while comparing experimental data from a cascade test and a rotating blades shaker test. These results are shown in terms of actual loss distribution, efficiency measurement, and vibration/stress mode on rotating blades including design criteria. Other useful applications of new technologies to reduce steam leakage and increase last stage blade performance are introduced. These involve modification of the exhaust casing and a new turning device. In particular, high speed and high loading are inevitable in synthesis gas compressor drive steam turbines. In order to improve operation reliability considering these factors, a special cooling design is applied for the thrust bearings to reduce the pad metal temperature. The results of this analysis and basic experimental data are discussed in detail. Furthermore, examples of actual job applications are explained, and high-speed balancing, mechanical running test, and site performance test results are shown.
Sasaki, Tomoyoshi; Hata, Satoshi; Ikeno, Kyoichi (2002). New Technologies Of Synthesis Gas Compressor Drive Steam Turbines For Increasing Efficiency And Reliability.. Texas A&M University. Turbomachinery Laboratories. Available electronically from