Method of measuring steam flow with flow meter

Abstract: The information on the method of measuring steam flow by flow meter is provided by the excellent flow meter and flow meter manufacturer and quotation manufacturer. Using flow meter to measure steam flow method Keywords: flow meter, steam flow elbow flowmeter, steam flow measurement is difficult, mainly because steam is a relatively special medium. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the method of measuring steam flow using flow meters. Using flow meter to measure steam flow method Keywords: flow meter, steam flow elbow flowmeter, steam flow measurement is difficult, mainly because steam is a relatively special medium. It will be transformed into saturated steam to form a vapor-liquid two-phase flow medium. For the steam whose phase flow changes frequently, there will definitely be a problem of inaccuracy in measuring the gas flow with the current flow meter. 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 cannot completely solve the problem of inaccurate steam flow measurement. However, the fundamental solution to the problem is to develop a flow meter that can measure two-phase flowing media. Five main factors should be considered when selecting a flow meter: the characteristics of the fluid to be measured, the production process, installation conditions, maintenance requirements, and the characteristics of the flow meter. For steam metering, the above five factors should also be considered. Here, we focus on discussing the characteristics, installation conditions, maintenance requirements and several issues that should be paid attention to when choosing a flow meter. At present, the instruments for measuring steam flow mainly include vortex flowmeters, differential pressure flowmeters, shunt rotor flowmeters, Annubar flowmeters, float flowmeters, etc. The vortex flowmeter and orifice flowmeter are mainly discussed here. and elbow flowmeters. Vortex flowmeter Vortex flowmeter is a new type of flowmeter successfully developed based on the principle of Karman vortex, which has developed rapidly since the 1970s. It is one of the alternative products of orifice flowmeter. It has the following characteristics: simple and firm structure, no moving parts; very convenient maintenance, low installation cost; wide measurement range, the range ratio can reach 1:10; small pressure loss, low operating cost; wide application range, gas, liquid Flow can be measured. However, the vortex flowmeter has certain limitations: the vortex flowmeter is a velocity type flowmeter, and the stability of the vortex separation is affected by the flow rate, so it has certain requirements for the straight pipe section, generally 10D in the front and 5D in the rear; When measuring liquid, the upper limit flow rate is limited by pressure loss and cavitation, which is generally 0.5 to 8m/s; when measuring gas, the upper limit flow rate is limited by the change of the compressibility of the medium, and the lower limit flow rate is limited by Reynolds number and sensor sensitivity. 8～25m/s; the stress vortex flowmeter is more sensitive to vibration, so when installing the flowmeter in a pipeline with large vibration, the pipeline must have certain damping measures; the stress vortex flowmeter adopts piezoelectric crystal as the detection sensor , so it is limited by temperature, generally -40 ~ +300 ℃. Orifice flowmeter has a long application history, has international standards, high theoretical accuracy, and is widely used. However, after decades of application, it is found that the orifice flowmeter has the following shortcomings: many factors in the application (design parameters and engineering Inconsistent condition parameters, insufficient upstream straight pipe section, orifice plate and pipeline are not concentric, orifice plate A surface is polluted, acute angle wear, etc.) have a great impact on its measurement accuracy, which increases the measurement error; installation is more troublesome, maintenance and The workload of dismantling and washing is large; the flow range ratio is 1:3, which has large limitations; if the installation is incorrect, steam leakage is likely to occur; the pressure loss is large and the operating cost is high. Elbow flowmeter Elbow flowmeter features: 1. Simple structure and low price. The elbow sensor is actually a 90-degree standard elbow. There is no flow sensor with a simpler structure. With the development of the machining industry and the continuous improvement of industry standardization and standardized management, the standard mechanism for elbow sensors is bent. The quality of the head is getting better and better, and the price is getting lower and lower. 2. Without any additional throttling parts or inserts, it can greatly reduce the power consumption of fluid transportation in the pipeline and save energy, especially for those measuring objects with large systems, large pipe diameters and low pressure heads. A simple example is given below to illustrate. In order to maintain the normal operation of an orifice flowmeter installed in a heating pipeline with a flow rate of thousands of tons per hour, it will consume tens of thousands of kilowatt-hours of electricity in a heating season, equivalent to tens of thousands of yuan. Here we only consider the pressure loss of the orifice flowmeter as a few kilopascals, which far exceeds this value in actual operation. Even the pressure loss of several kilopascals,The additional operating costs it causes cannot be ignored. The data given in Table 1 shows the additional power consumption of the circulating pump caused by the orifice flowmeter when the flow range of the main pipeline used in the current heat pipe network is in different pressure losses, the power consumption, the amount of standard coal, and the cost of purchasing coal. The data of the operating cost of the orifice plate flowmeter in a heating season, in which the number of operating days is 120 days, the electricity price is 0.35 yuan/kWh, and the standard coal price is 200 yuan/t.

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