Abstract
A steam injector (SI) is a passive jet pump without movable parts, able to drive water by supersonic steam jet, reaching a discharge pressure even higher than the supply steam pressure. Moreover the SI works as a high-performance direct-contact heat exchanger between steam and water. This provides SI with capability to serve also as a direct-contact feed-water heater that heats up feed-water by using extracted steam from the turbine. We have developed multi-stage SIs, which have high performance in wide operation range and can be used in parallel-operation to simplify the feed-water heating system of nuclear and thermal-power plants. In this study, we carried out endurance tests in order to verify the performance and endurance of the multi-stage SIs under operation during prolonged time period. The multi-stage SIs have undergone a global amount of 40 hours operation with steam and no performance degradation has been evidenced. According to the inspection of inner parts of SI, high endurance of the component was shown in continuous operation under the conditions similar to those for which it is designed.
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