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Avec plus de 30 ans d'expérience dans les services de production d'électricité et de vapeur industrielle, Tetra Engineering a une longue histoire de projets.
Tetra Engineering was asked to assess the situation after a significant water slug/hammer event. Observations made during the site visit showed that the structural members were severely damaged with steel being heavily deformed and torn in some cases. Piping supports were also severely damaged and would require repair.
Tetra Engineering was asked by a client to help to assess the cause of tube failures in the upper section of the LPEVAP on their HRSG units. The first tube failure was reported in 2010; other failures have followed since then at a rate of two to three per year. At the time of the first failure the plant had been operating for approximately three years. Tetra performed a root cause analysis which included a review of water chemistry logs, boiler simulations using PPSD as well as a FAC Risk Assessment.
A CCGT power plant employed Tetra to perform a review of possible boiler preservation options within the context of the present and planned operating regime. The review relied on information supplied by the plant staff, Tetra field experience and latest industry trends and practices to identify the most promising strategy for preservation. The ideal solution for this client was Dry Layup that is systematically applied when it reaches the end of the standby period. This would require that resulting startup timing meets requirements imposed by the governing network operator.
The primary purpose of this study was to validate the effect of an interstage attemperator between two superheaters with respect to the primary superheater and primary reheater outlet steam temperatures. The CCGT in question had already had problems with creep failures of the P91 components, and needed to assure that exit temperatures did not exceed 570°C. Currently, the primary superheater outlet temperatures exceed 600°C at certain loads and the primary reheater temperatures exceed 590°C. Initial results were based on steady-state analysis, while final results included dynamic modeling of cold-, warm- and hot starts, as well as ramp up and ramp down. The study was performed using the software simulation tool PPS&D.
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