FIELD: measuring equipment.
SUBSTANCE: invention relates to the field of determining the thermal-physical parameters of the water heat carrier in two-phase state of water, namely, to the field of determining the degree of dryness of wet steam in steam pipes. A method for determining the degree of dryness of wet steam in steam pipes is proposed, including measuring the static pressure in the steam pipe and continuous selecting of steam from the steam pipe, throttling the selected sample into the flow volume with measuring the pressure and temperature of the steam at the outlet of the flow volume into the heat carrier return line communicating with the atmosphere. The method also includes thermal insulation of the steam sample taken from the point of its selection to the output from the heat-insulated flow volume to the heat carrier return line communicating with the atmosphere, determining, by temperature and pressure at the output from the heat-insulated flow volume, the state of the steam sample taken: if there is (adiabatic) overheating or if there is no (adiabatic) overheating. If there is overheating: the enthalpy of the steam sample is determined by the temperature and pressure at the output of the heat-insulated flow volume, the degree of dryness of the wet steam in the steam pipe is determined by the static pressure in the steam pipe and the enthalpy of the steam sample. If there is no overheating: the limit for determining the degree of dryness of wet steam (in the steam pipe) is calculated by its static pressure and the enthalpy of the vapor phase of the steam sample taken; the signal is set: the degree of dryness of wet steam in the steam pipe is below the limit of its determining.
EFFECT: provided is determination of the degree of dryness of wet steam in the steam pipe by the parameter of a continuously selected steam sample without external heat supply and without measuring its flow rate.
1 cl, 1 dwg
