FIELD: measuring of water parameters.
SUBSTANCE: invention relates to the field of determining the thermophysical parameters of water in its two-phase state, namely to the field of determining the mass flow rate and the degree of dryness (the ratio of the mass flow rate of the gas phase to the total mass flow rate of the two-phase flow) of wet steam in the steam line from the steam generator. A method is proposed for determining mass flow and sporadic determination of the degree of dryness of a wet steam flow in a steam line from a steam generator, including: measuring the static pressure in the steam line with a pressure receiver in the steam flow. The method includes determining the mass flow rate of wet steam in a steam line based on the pressure drop across its receivers in the steam line, the density of the vapor phase of wet steam, the cross-sectional area of the steam line and a fixed value of the conversion function to flow rate. Next, the calculated value of the mass flow rate of isokinetic steam sampling is determined by the mass flow rate of wet steam in the steam line, as well as by the ratio of the areas of the steam sampling window from the steam line to the cross-sectional area of the steam line. The mass flow rate of the collected sample of wet steam is determined by the mass value of the volume of coolant removed from the chamber cavity and the duration of sampling the steam into the chamber cavity. The degree of dryness of the wet steam sample taken into the chamber cavity is determined by the static pressure in the steam line, fixed values of the coolant temperature in the chamber cavity and the mass flow rate of the wet steam sample. The degree of dryness of wet steam in the steam line is determined by the mass flow rate and the degree of dryness of the wet steam sample taken into the chamber, as well as the calculated value of the mass flow rate of isokinetic sampling of wet steam from the steam line.
EFFECT: increase in the accuracy of determining the degree of dryness of wet steam in a steam pipeline.
1 cl, 1 dwg
