Velocity-equalizing tube flow meter scale application in power plant

Abstract: the scale velocity-equalizing tube flowmeter in power plant, the application of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: the paper introduces the measuring principle of differential pressure type flow measuring devices, orifice of differential pressure type flow measuring devices made comparison with velocity-equalizing tube, plug flow probe used in power plant is discussed, and the advantages and ensure the safety of the probe and accurate use of conditions. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale velocity-equalizing tube flowmeter in power plant, the application of article details. Introduced the measurement principle of differential pressure type flow measuring devices, and for the orifice differential pressure type flow measuring devices made comparison with velocity-equalizing tube, plug flow probe used in power plant is discussed, and the advantages and ensure the safety of the probe precise use condition and matters needing attention. Key words: the flow measurement orifice velocity-equalizing tube with the rapid development of power industry, all kinds of efficient new technology, new technology has been put into use. Advanced technology need to match the high precision control and measurement. For boiler and steam turbine of wind, water, smoke, all kinds of medium flow comprehensive accurate measurement, is to ensure its safe and economic operation of one of the necessary conditions. There are many types of flow measurement products, according to the zui broad classification can be divided into: volumetric flowmeter, differential pressure flowmeter, flow meter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter and mass flowmeter, etc. Various flow meter has its own characteristics, there is no one way to measure or flowmeter can for all kinds of fluid and can adapt to all kinds of flow conditions. Different requirements for different measuring method and structure, operation, use methods and conditions of use. Each meter has its advantages and disadvantages, therefore, in a variety of measurement methods and instrumentation features for a comprehensive understanding of comparison on the basis of the choice is suitable for the characteristics of the specific production, is safe, reliable and economic durable zui flow measurement products. A differential pressure type flow measurement of orifice plate with uniform velocity tube is 1. 1 species currently differential pressure type flow measuring devices, and zui widely used in industrial measurement or differential pressure type flow measurement, differential pressure type of mainstream products for the throttle type ( Orifice plate and venturi tube, etc. ) And the dynamic pressure head type ( Velocity-equalizing tube) 。 Using the principle of differential pressure flow rate measurement is the engineering zui classic reliable flow measurement methods, differential pressure flowmeter is according to the installation in pipe flow test of differential pressure, the fluid known conditions and geometry size of test pieces and pipeline to calculate the flow. By a differential pressure type flowmeter device ( Detection) And the second device ( The differential transformation and flow display instrument) Composition. Usually in the form of test pieces classification of differential pressure flowmeter, such as orifice meter, venturi meter, velocity-equalizing tube flowmeter, etc. The pipe flow test pieces of the differential pressure, the greater the cost for differential pressure transmitter type selection and the more benefits, also good for the accuracy of measurement. But because of the flow measurement device is usually choose according to flow volume shrinkage ratio ( Orifice, nozzle) And therefore improve the pressure loss of the differential pressure at the same time also can produce increases. * in the pipeline pressure loss increase need to increase the pipe, it need high power fan and water pump, such as increased energy consumption, increase the operation cost of the whole system. Differential pressure on behalf of the product for the orifice flowmeter, because its installation, use and maintenance are very familiar with, and the orifice plate is easy to copy, simple, firm, stable and reliable performance, long service life, low price, so for a long time to apply widely. But the orifice plate using a long time, precision will fell sharply, the need for periodic inspection and cleaning. 1. 2 velocity-equalizing tube flowmeter measurement principle velocity-equalizing tube flowmeter is measured by a replacing orifice diameter on the velocity of cross section of flow velocity, as velocity-equalizing tube cross section and opening technology continuous development, increasing the accuracy of measurement. Systec - Germany Controls the company and the delta of German famous Erlangen university jointly launched velocity-equalizing tube flowmeter adopted streamlined tube design, traffic detection is by inserting medium pipeline velocity-equalizing tube on the two rows of uneven distribution of selecting pressure hole to detect produced by fluid differential pressure, draw a mean difference of pressure caused by the average flow velocity, and the differential pressure through the interface to the transmitter. Through multiple uneven pressure hole, can truly reflect the average flow velocity in pipe as far as possible. Makes it not only stay in the flow measurement precision, high strength and large span ratio, also greatly reduce the pressure loss of the pipeline. Using plug flow probe compared with using orifice plate, due to the pressure loss of the pipeline is reduced, the economic benefit is very obvious. At the same time characteristic of the probe design can also meet the requirements of small loss of pressure and differential pressure big, easy selection of transmitter. Take the single point of the signal's plug-in flow sensor ( Such as insert turbine, vortex street, electromagnetic, etc. ) Detection of the pipeline flow velocity of one point, and then through the analysis of the velocity profile to experience on the diagram the testing point, deduce the average flow velocity. Pipe, fluid, such as comprehensive situation is complicated, mostly is to finalize the design velocity profile, with a measured value instead of average flow velocity is not accurate, as a direct result of measurement precision is poor, low repeatability.

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