Investigation Tests of the P-134 Heat-Recovery Steam Generator Used as Part of the PGU-230T Combined-Cycle Power Unit

Abstract

Investigation tests of the P-134 heat-recovery steam generator (produced by PJSG Zio-Podolsk) used as part of the PGU-230T combined-cycle power unit at the Chelyabinsk combined heat and power plant no. 3 (CHPP-3) were carried out, as a result of which experimental data on the steam generator thermal parameters have been obtained, and adequacy of the thermal–hydraulic design analysis model developed by PJSG ZiO-Podolsk has been confirmed. A description of the heat-recovery steam generator is given along with schematic arrangements of experimental instrumentation, test conditions and techniques, and experimental data processing methods. A procedure and computer program for estimating the steam generator thermal parameters, and a procedure for reducing the test results to design conditions are elaborated. It has been determined that the total thermal power of heating surfaces in the steam–water path deviates from the steam generator total thermal power directly measured at the boundary balance sections by no more than 0.84%. The steam generator thermal power values determined with reference to the steam–water and gas paths differ from each other by no more than 1.7%. The steam generator thermal power obtained in the tests differs from its design value by no more than 2.4%, and it should be noted that its value measured in all operating modes was higher than its design value. The design thermal power values of the high-pressure loop heating surfaces reduced to the test conditions differ insignificantly (and toward increasing) from their actual values. The obtained results demonstrate that the analysis models can be used for reducing the test results to the heat-recovery steam generator operating conditions (parameters) at which the conformity of their values is established for confirmation (assessment) purposes, in particular, in carrying out warranty tests. It has been shown that the heat recovery steam generator’s thermal power reduced to the warranty conditions that was obtained in all test modes is somewhat higher than the design thermal power under the warranty conditions.