Combined device for measuring wet steam flow and dryness and measuring method thereof

Abstract

The present invention discloses a combined type measuring device of the steam flow and the degree of dryness and the measuring method thereof. The device uses the standard pore plate, the classical Venturi pipe as a one-time measuring element. Standard signals is transformed and transmitted by the high-precision pressure sensor and the intelligent differential pressure transmitter, and the standard 4~20mA signals are transformed into 1~5 V pressure signals through I / V and then the signals are input into the high-speed data collecting card. At last, the density of the saturated vapour and the saturated water, the specific enthalpy, the latent heat of vaporization are calculated in the central processing unit by invoking the IAPWS-IF97 formula module of the steam and water property according to the pressure signals, thus, the degree of dryness, the quality flow, the carried heat are calculated. At the same time, the quality flow and the carried heat are in cumulate calculation, and the important parameters are storied in the database in time. Comparing to that of the traditional calculating formula IF-67, the calculating precision of the present invention has been improved more than 10 times and the iterative calculating precision is high and the calculation speed is improved 4~12 times.

Description

technical field [0001] The invention relates to a measuring device, in particular to a combined wet steam flow and dryness measuring device and a measuring method thereof. Background technique [0002] In heavy oil production in oilfields, thermal recovery by steam injection is generally adopted. In order to prevent scaling in the boiler tubes of once-through steam injection boilers, the dryness of the steam at the boiler outlet is 70-80% wet steam. Therefore, in the actual production process, it is very important to measure the flow and dryness of the wet steam in the transmission pipeline for the recovery of heavy oil. Since the measurement of wet steam is a dual-parameter measurement of flow rate and dryness, it is very complicated. From the domestic research situation, there is no very mature application technology. At present, the existing technology is to use an independent single-phase flow standard orifice plate Or the Venturi tube is combined with a microprocessor ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low measurement accuracy of the wet steam flow and dryness dual parameters and slow parameter operation speed, and provide a combination of high wet steam flow and dryness dual parameter measurement accuracy and fast parameter operation speed. Measuring device and measuring method for wet steam flow and dryness

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