The main points of steam flow meter measurement

Abstract: The key information of steam flow meter measurement is provided by excellent flow meter and flow meter manufacturers. Steam can be divided into saturated steam and superheated steam. In the flow calculator, the mass flow can be obtained by looking up the density of the superheated steam according to the temperature and pressure of the table. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the main points of steam flowmeter measurement. Steam can be divided into saturated steam and superheated steam. In the flow calculator, the mass flow rate can be obtained by looking up the density of the superheated steam according to the temperature and pressure of the table. However, when the superheated steam is transported over a long distance, or due to improper insulation measures in the pipeline, the temperature of the superheated steam is often reduced due to heat loss. The superheated state enters the critical saturation state, and even part of the steam condenses and undergoes a phase change to become water droplets, which becomes wet saturated steam (supersaturated steam). In the heating industry, the inaccurate measurement of steam flow meters is a common problem. The main reasons are as follows. 1. Analysis of measurement: At present, the measurement of steam flow is used, and the measurement medium refers to single-phase superheated steam or saturated steam. For steam with frequently changing phase flow, there will definitely be inaccurate measurements. The solution to this problem is to maintain the superheat of the steam and reduce the water content of the steam as much as possible, such as strengthening the insulation measures of the steam pipeline and reducing the pressure loss of the steam, so as to improve the accuracy of the measurement. However, these methods can not completely solve the problem of inaccurate steam flow measurement. The fundamental solution to this problem is to develop a flow meter that can measure two-phase flow media. 2. After the superheated steam is transported over a long distance, with the change of working conditions (such as temperature and pressure), especially when the superheat degree is not high, it will enter from the superheated state into saturation or saturation due to the reduction of the heat loss temperature. Supersaturated state, transformed into saturated steam or supersaturated steam with water droplets. The saturated steam is suddenly decompressed greatly, and the liquid will also be saturated steam or supersaturated steam with water droplets when adiabatic expansion occurs. The saturated steam is suddenly greatly decompressed, and the liquid will also be transformed into superheated steam when adiabatic expansion occurs, thus forming a vapor-liquid two-phase flow medium. There are many types of flowmeters used to detect gas flow. Velocity and volumetric flowmeters are the most commonly used. Their common feature is that they can only measure the volume flow under working conditions continuously, and the volume flow is a function of the state. The volume flow can not exactly represent the actual flow. In engineering, it is generally represented by the standard state volume flow or mass flow. Therefore, the measurement of steam flow requires more compensation measures, and the compensation factors due to the state change of steam are also more complicated. The density of superheated steam is determined by the two parameters of steam temperature and pressure, and in different ranges of parameters, the expression form of density is also different, and cannot be expressed by the same general formula, so it is impossible to obtain a unified density calculation formula, only individual Derive the temperature and pressure compensation formula. In the case where the temperature and pressure fluctuation range is large, in addition to the temperature and pressure compensation, the compensation for the gas expansion coefficient ε also needs to be considered. No matter what kind of flowmeter is used to detect the flow of saturated steam, it is necessary to take pressure compensation measures when working under the condition of steam pressure fluctuation. This is because the steam density factor is included in the flow equation. When the working conditions are inconsistent with the design conditions, There will be errors in the readings, and the magnitude of the error is related to the deviation of the working pressure and the design pressure. At present, the following three measures should be taken: (1) The pipelines transporting steam must have good insulation measures to prevent heat loss. (2) During the boiler operation, the phenomenon of excessively high liquid level in the steam drum should be avoided, and the large fluctuation of the load should be minimized. (3) The steam pipeline should be drained one by one, and the drain should be installed at the lowest part of the pipeline and the pipeline before the instrument to drain the condensed water in time. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The main points of steam flow meter measurement'

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