METHOD FOR DETERMINING AIR SUCTION IN THE VACUUM SYSTEM OF STEAM TURBINE PLANTS Russian patent published in 2023 - IPC G01N29/14 

FIELD: steam turbines.

SUBSTANCE: invention us intended to determine the suction of air in the vacuum system of steam turbine plants. The temporal realizations of acoustic signals on the surface of the equipment are measured and the amplitude, spectral and correlation criteria for the presence of a leak are calculated, whereas the temporal realizations of acoustic signals are measured at two points of the alleged suction s₁, s₂ and at two points of the no suction s₃,s₄ to determine the reference signal, filter the received acoustic signals, determine the stationary sections of acoustic signals, form a sample of temporal realizations of acoustic signals, the amplitude criterion for the presence of suction critA is calculated based on a comparison of the standard deviations of the signals s₁, s₂, s₃, s₄, the spectral criterion for the presence of suction critE is calculated based on a comparison of the entropy of the spectra of signals s₁, s₂ and signals s₃, s₄, the correlation criterion for the presence of suction critR is obtained based on the calculation of the partial correlation coefficient of signals s₁ and s₂, excluding the influence of signal s₃, after which the weighted integral criterion for the presence of suction cup crit is calculated using the formula crit=α⋅ critA+β⋅ crit+γ⋅ critR, where α ,β ,γ are weight coefficients such that α +β +γ =1, whereas if the crit value is less than 0.5, it is concluded that there is no air suction; if the crit value is in the range of 0.5-0.67, it is concluded that air suction is possible; if the crit value exceeds 0.67, a conclusion is made about the presence of air suction.

EFFECT: increasing the speed of determining air suction in the vacuum system of steam turbine plants, as well as expanding the scope and increasing accuracy.

1 cl, 7 dwg