FIELD: measuring technology.
SUBSTANCE: invention relates to technical physics, namely to the field of determining the thermophysical parameters of wet water steam, can be used to determine its mass flow rate, degree of dryness and other steam parameters in steam pipelines of thermal power plants, nuclear power plants, or individual steam generating units. A distinctive feature of the method for determining the mass flow rate and the degree of dryness of wet steam in the steam line from the steam generator is the preliminary determination of the reference parameter of the degree of dryness by a third-party method, and the subsequent stages. In the stationary state interval of all measured values, both in the steam line from the steam generator and in the feed water supply system: determination of a fixed value of the degree of dryness of wet steam by the reference parameter of the degree of dryness, determination of a fixed value of the mass flow of wet steam by the parameter of the mass flow of feed water. According to the determined values of the density of the steam and liquid phases, the measured values of dynamic vacuum, dynamic pressure, a fixed value of the degree of dryness and a fixed value of the mass flow rate of wet steam: calculation and fixation of the ratio of dynamic vacuum at a controlled point of the cross-section of the wet steam flow to the average value of this parameter over the cross-section of the wet steam flow (parameter k), calculation and fixing the ratio of the cross-section averaged velocities of the steam and liquid phases of wet steam (parameter S). In the interval of the stationary state of the measured values in the steam pipeline from the steam generator with the non-stationary measured values in the feed water supply system: determination of a fixed value of the degree of dryness of wet steam by the reference parameter of the degree of dryness, calculation and fixation of the parameter S by the determined values of the density of steam and density of liquid phases, the measured values of dynamic vacuum, dynamic pressure, a fixed value of the degree of dryness, a fixed value of the parameter k; calculation of the mass flow rate and the degree of dryness of wet steam, according to: the determined values of the density of the steam and the density of the liquid phases, the measured value of the dynamic vacuum, the measured value of the dynamic pressure, the fixed value of the parameter k, the fixed value of the parameter S.
EFFECT: increase in the accuracy of determining the current values of mass flow and the degree of dryness of wet steam in the steam line from the steam generator.
1 cl, 1 dwg
