Differential pressure type steam dryness measurement instrument and calculation method

Abstract

The invention relates to a differential pressure type steam dryness measurement instrument and a calculation method. The differential pressure type steam dryness measurement instrument comprises a steam sampler, a temperature transmitter, a differential pressure transmitter, a pressure transmitter and a dryness calculator, wherein the steam sampler comprises a main pipeline section and a stop needle valve pressure guiding hose, the temperature transmitter, the differential pressure transmitter and the pressure transmitter are connected to the dryness calculator, and finally the accurate dryness value is obtained through the operation of the dryness calculator. According to the present invention, the differential pressure type steam dryness measurement instrument has advantages of good stability, high measurement precision, simple structure, low cost and simple operation, can be widely used in engineering practice, further has advantages of fast dynamic response, strong continuous and real-time display and recording function, low maintenance amount and the like, can provide important significance in the measurement of the heat of saturate steam and the identification of the qualityof steam, and further has extremely broad application and development prospects.

Description

technical field [0001] The invention relates to the technical field of steam dryness testing, and more specifically, the invention relates to a differential pressure steam dryness measuring instrument and a calculation method. Background technique [0002] Steam dryness is an important parameter of wet steam, which directly affects the accurate measurement of steam flow and heat. Dryness is an important parameter unique to vapor-liquid two-phase flow. It cannot be directly measured like pressure and temperature. Although dryness is very important in practical applications, due to the complexity of vapor-liquid two-phase flow and the relationship between vapor and liquid Due to the timeliness of phase transition, the measurement of steam dryness has become a difficult problem that has not been well solved in the world. At present, there are many methods for measuring steam dryness at home and abroad, which are mainly divided into three categories: assay method, non-thermodyn...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that (1) it is not suitable to make a real-time measuring instrument in turn; (2) it can only measure the dryness of the boiler, but it has no effect on the measurement of the dryness in the process of steam transportation.

[0005] 2. Non-thermal method

However, these methods are difficult to apply due to different reasons.

Images