Application of the ultrasonic flowmeter scale in coalbed methane flow meter scale

Abstract: the application of the ultrasonic flowmeter scale in the coal-bed gas flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: the flow measurement of coal seam involves the economic relationship of both parties, makes a necessary measure for coal flow, in this paper is a non-contact measurement of ultrasonic flowmeter, because of its convenient, cheap, and so on widely. More flow meter manufacturers choose model price quote you are welcome to inquire, below is the application of the ultrasonic flowmeter scale in the coal-bed gas flow meter scale article details. Coal seam of the flow measurement involves the economic relationship of both parties, makes a necessary measure for coal flow, this paper introduces a kind of non-contact measurement of ultrasonic flowmeter, because of its convenient, cheap, and so on and has been widely used, based on the measuring principle of ultrasonic flowmeter and the influencing factors of ultrasonic measuring accuracy analysis, illustrates the methods to solve the accuracy of measurement, provides the instrument selection, installation guidance and advice. Traffic is one of the important parameters in coalbed methane production gathering. Flow measurement value of accurate or not, it will directly affect the stability of the system is running and transition of the economic interests of both sides. The current domestic production of measuring flow rate on the basis of the principle of all kinds of flowmeter is a lot of more phyletic, such as the volumetric flowmeter, vortex flowmeter, differential pressure flowmeter, ultrasonic flowmeter, etc. Ultrasonic flowmeter is along with the rapid development of integrated circuit technology to get the actual application of a kind of non-contact instruments. Compared with other types of flowmeter, ultrasonic flowmeter has no pressure loss, high cost performance, wide measuring range, General can achieve those days) Wait for a characteristic. Velocity difference method ultrasonic flowmeter measurement range can be up to 300:1. Therefore, in the big diameter of coalbed methane used in the measurement of ultrasonic flowmeter has the outstanding advantages. Especially in urban gas, gas gas peak during the day and night, low gas flow rate difference is different, the characteristics of the ultrasonic flowmeter measurement range wide well adapted to this. 1, the measuring principle of ultrasonic flowmeter, ultrasonic flowmeter by ultrasonic transducer converts electrical energy into ultrasonic energy, emission and in a certain way is through the measurement of body, the receiver receives the ultrasonic signal, for display and display totalizer. especially integrating, implementation flow test show. Ultrasonic flowmeter two ultrasonic transducer ( Also called ultrasonic probe) Respectively on both sides of the outer wall of pipeline installation, symmetry (at a certain Angle See figure la) Or in the same side ( As shown in figure 1 b) 。 Figure 1 ultrasonic flowmeter measurement principle of the ultrasonic transducer used lead zirconate titanate ceramic, under the stimulus of electricity, ultrasonic transducer produced at a certain incident Angle into the wall and into the fluid in the form of shear wave propagation in the pipe wall, and in the form of longitudinal wave within the fluid transmission, zui after through the media, through the pipe wall was received by the transducer. When measuring two sensors are transmitting and receiving probe, in order to ensure the transmission of ultrasonic wave in two direction under the same gas velocity, when the design makes two emit ultrasonic transducer at the same time to the other party. According to the different measurement parameters, its measuring principle can be divided into the method of time difference, frequency difference and phase difference method three, only introduce commonly used two kinds. In la, for example, the Angle of the normal sensor and the pipe for & theta; 1,δ For pipe wall thickness, D for the nominal pipe diameter. Ultrasonic pulse signal transmission speed for c, fluid velocity v, two sensors ( T1 and T2) The attachment and gas flow direction Angle between the & theta; , the ultrasonic speed on the gas flow direction component vcosθ , and speed of fluid velocity superposition and since c± vcosθ 。 When ultrasonic horizontal velocity component direction and fluid flow in the same direction, and the speed to a c + vcosθ And vice versa for c - vcosθ 。 1. 1 difference method measuring principle when T1 T2 launch reception, transmission of T1 and T2 time: when the T1 T2 launch reception, T2 to T1 transfer time: get clear: is the frequency of the two directions: from ( 4) Type can be seen, the frequency difference measurement can get gas velocity v, which can calculate the volume flow, i. e. , the formula and the production of natural gas can be obtained: 1. Principle of time difference method (2 3) Type tidy: so to t12 and t21, between the two time parameters, can be obtained by gas velocity v, formula calculated the natural gas production from (: 6) 、（ 8) Type can be seen, the use of natural gas ultrasonic flowmeter output Q has nothing to do with the speed of ultrasonic pulse signal. 2, the performance characteristics of ultrasonic with orifice flowmeter, turbine, compared to traditional vortex street flowmeter, has strong adaptability, operation is convenient wait for a characteristic, See table 1) 。 3, the factors influencing the accuracy of the ultrasonic flow measurement, there are many factors influencing the accuracy of the ultrasonic flowmeter, has two aspects: the main factors effect the performance of the instrument itself. The influence of the installation quality. 3. 1 meter of the selection principle of measurement of the velocity difference method is to measure the average flow velocity on the ultrasonic transmission way, whether the average flow velocity can correctly reflect the flow area of velocity for has an impact on the accuracy of the measurement.

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