The characteristics of the flow meter measuring steam and scope of application

Abstract: the characteristics and applicable scope of information flow meter measuring steam produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Steam flow measurement is difficult, mainly because the steam is a special medium, as the operating conditions ( Such as temperature, pressure) Change of superheated steam into saturated steam, often form gas-liquid two phase flow medium. For changing phase flow of steam. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the characteristics and applicable scope of steam flow meter measurement details. Steam flow measurement is difficult, mainly because the steam is a special medium, as the operating conditions ( Such as temperature, pressure) Change of superheated steam into saturated steam, often form gas-liquid two phase flow medium. For frequently changing steam phase flow, the flow meter is used to measure the gas flow rate, will certainly has the problem of uncertainty. The solution to this problem is to keep the steam superheating temperature, reduce the water content of steam as far as possible, strengthen the steam pipe heat preservation measures, for example, to reduce the pressure loss of steam, etc. , in order to improve the accuracy of measurement. However, these methods can not completely solve the problem of steam flow uncertainty, the fundamental way to solve the problem is, however, to develop a measurable two-phase flow medium flow meter. Should be considered when choosing flow meter five main factors: the current body characteristics, production technology, installation conditions and maintenance requirements and characteristics of the flow meter. For steam metering, also want to consider the above five factors. Here, the characteristics of flow meter is discussed in this paper, selection of installation conditions, maintenance requirements and flow meter several problems should be paid attention to. At present, the main measurement of steam flow meter, differential pressure flowmeter, vortex flowmeter shunt rotor flowmeter, and pig flowmeter, float-type flowmeter, vortex flowmeter are discussed here, orifice flow meter and bend flow meter. Vortex street flowmeter vortex flowmeter is based on the principle of karman vortex street and successfully developed a new type of flowmeter, got rapid development since the 70 s. Orifice flowmeter is one of the alternatives. Has the following characteristics: simple structure and firm, no moving parts; Maintenance is very convenient, low cost of installation; A wide range of measurement range ratio of 1:10; Less pressure loss, low operating cost; Application range is wide, gas, liquid flow rate can be measured. But the limitation to the vortex flowmeter, vortex flowmeter is a kind of speed type flowmeter, vortex separation stability affected by flow rate, so it have certain request for straight pipe, usually after 10 d, 5 d; Measurement of liquid, the limit velocity of pressure loss and the corrosion phenomenon, generally is 0. 5～8m/s； Measuring gas is restricted by medium compressibility change limit velocity, Reynolds number and lower velocity sensor sensitivity limit, steam is 8 ~ 25 m/s; Stress vortex flowmeter is sensitive to vibrate more, larger pipe installation flow in vibration time, pipeline must have certain shock absorption measures; Stress vortex street flowmeter using piezoelectric crystal as detection sensor, so its restricted by temperature, is commonly - 40～+300℃。 Orifice meter orifice meter application has a long history, has the international standard, the theory of high precision, has been widely applied, but after decades of application, found the orifice flowmeter has the following defects: many factors in the application ( Design parameters and working parameters of the discrepancy, insufficiency of straight pipe upstream and orifice plate and pipe of different heart, orifice a-side polluted, acute wear, etc. ) Has a very large effect on the accuracy of measurement, the measurement error; More trouble installation, maintenance and unpick and wash the larger workload; Flow range ratio of 1:3, limitations; If the installation is not correct, prone to leakage; The pressure loss is bigger, the high cost of operation. Elbow flowmeter bend flow meter features: 1, simple structure, low price. Bend sensor is, in fact, a 90 - degree standard elbow, nothing is more simple than its structure flow sensor, with the development of mechanical processing industry and industry standardization and continuous improvement of the standardized management, used as a standard mechanism elbow bend sensor its quality is getting better and better, the price is becoming more and more low.

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