Method and device for measuring saturated steam dryness through steam ejecting and extraction

Abstract

The invention belongs to the field of saturated steam dryness measurement and in particular relates to a method and device for measuring condensing type saturated steam dryness, wherein to-be-measured saturated steam can be introduced into a container filled with a certain amount of cooling water from a negative pressure system so as to perform mixed heat exchange. The to-be-measured saturated steam is introduced into the container filled with a certain amount of water so as to perform mixed heat exchange by using a steam ejecting and extracting device, the steam is condensed into water in the container, the heat is released, water level and temperature in the water tank are raised, and the total mass of the to-be-measured saturated steam is calculated based on increase of the water volume. Moreover, the heat released by the steam is calculated according to the water temperature change, the pressure of the saturated steam, the water level, the water temperature, the flow of superheated steam, the pressure and the temperature are measured, the various detected numerical values are transmitted to an upper computer, the dryness of the saturated steam is calculated by utilizing a heat balance equation, and the dryness of the saturated steam can be measured and displayed in real time.

Description

technical field [0001] The invention belongs to the field of dryness measurement of saturated steam, in particular to a condensing saturated steam dryness measurement method and a device thereof capable of introducing saturated steam to be measured from a negative pressure system into a container with a certain amount of cooling water for mixed heat exchange. Background technique [0002] At present, the known methods for measuring the dryness of saturated steam include: (1) The test method determines the dryness of saturated steam by sampling the saturated steam to be tested and testing the salt content in the water. The assay method is a laboratory detection method, which is not suitable for online real-time measurement in engineering. (2) Non-thermodynamic methods include optical detection method, conductivity probe method, capacitance method, hot wire and γ-ray method, etc. At present, the non-thermodynamic method still has great limitations and shortcomings in engineer...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method and device for measuring the dryness of saturated steam by injecting steam and extracting air, aiming at solving the problem that the measurement accuracy of the dryness of saturated steam in the prior art is affected by the difference between the end difference of the heat exchange surface and the degree of cleanliness. It cannot be used in negative pressure systems, and the system composition is complex and expensive

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