Gas flow meter measuring gas flow case

Abstract: The case information of gas flow meter measuring gas flow is provided by excellent flow meter and flow meter manufacturers. First, the working principle of the gas flowmeter The gas flowmeter is a throttling differential pressure flowmeter. It is based on the fluid flow continuity equation and Bernoulli's equation when the fluid filling the pipe flows through the throttle. The flow velocity forms a local contraction at the throttling part. thus. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the case article of gas flowmeter measuring gas flow. First, the working principle of the gas flowmeter The gas flowmeter is a throttling differential pressure flowmeter. It is based on the fluid flow continuity equation and Bernoulli's equation when the fluid filling the pipe flows through the throttle. The flow velocity forms a local contraction at the throttling part. As a result, the flow rate increases and the static pressure decreases, creating a differential pressure before and after the throttle. The greater the fluid flow. The greater the differential pressure generated. By measuring the magnitude of the differential pressure, the flow rate of the fluid can be calculated. The gas flowmeter also follows the calculation formula of the differential pressure flowmeter: C——Outflow coefficient: ε——Swellability coefficient: d——Throttle hole diameter, m,β——Throttle ratio coefficient,β=d/D, D——Inner diameter of upstream pipeline.m; △p——Differential pressure, Pa;ρ1——Upstream fluid density, kg/m. The difference between the gas flowmeter and other differential pressure flowmeters is that the throttling part adopts a spindle. The spindle is installed along the central axis of the measuring tube. Its geometric shape is carefully designed according to the principle of fluid mechanics, and is optimized by genetic algorithm. A perfect streamline. The flow separation can be avoided and the resistance to the fluid is minimized. A uniform annular channel (channel) is formed between the middle of the spindle and the inner wall of the measuring tube. The high pressure of the gas flowmeter is taken from the measuring tube corresponding to the spindle head (leading edge). wall. The low pressure is taken from the middle and rear part of the spindle. The measured fluid is close to the head of the spindle. Its velocity distribution begins to be adjusted: as the fluid flows through the spindle head. The intensity of its velocity distribution is continuously increased when the fluid enters the annular channel. Its velocity distribution begins to be“standardization”. The pressure distribution is also“standardization”. in the annular channel area. The pressure drops linearly along the axis and is very stable with almost no pulsation. The front and rear support pieces of the spindle are designed according to the theory of aircraft wings. Was a good streamline. Very little resistance. Position the spindle firmly and accurately in the pipe, ensuring good axis symmetry. Second, the performance characteristics of gas flowmeter Gas flowmeter as a new generation of differential pressure flowmeter. It has many obvious progress and distinctive features 1 . High accuracy. Good repeatability due to its unique throttling design. Various actual flows can be quickly adjusted to standard annular channel flow. And the pressure at the pressure point is very stable: no flow separation occurs in the entire flow field in the throttling device. No vortices appear and no additional pressure fluctuations occur. These characteristics of the gas flow meter throttling device make it very easy for the differential pressure transmitter to obtain a continuous and stable pressure difference. Measurement accuracy can be better than±0.5% ． The repeatability is better than 0.2% (this is the data when measuring gas or steam. When measuring liquid, the measurement accuracy can be better than±0.2% ． The repeatability is better than 0.1%). Reflects the most basic performance of the flowmeter——Accurately measured. 2. Large flow range. When the flow rate (Reynolds number) is greater than a certain value, the gas flowmeter with a wide range ratio. The flow coefficient is constant. Weak nonlinearity occurs only at small flow rates due to the influence of fluid viscosity (Reynolds number). This greatly reduces the nonlinear range of the gas flowmeter. The flow coefficient keeps a constant value in the direction of large flow (Reynolds number) even in the nonlinear range of small flow, due to the excellent repeatability of the gas flowmeter itself. The pressure signal of the gas flowmeter can still be measured more accurately, and the pressure signal is very stable. High signal-to-noise ratio. The turndown ratio of a single meter can reach 10:1. According to special requirements can also be extended to 15:1.3. No straight pipe requirements. A well-developed pipeline flow with strong on-site adaptability is crucial to the accuracy and stability of a flow meter. But this kind of flow is not easy to obtain. A straight pipe section that is dozens of times the diameter of the pipe must be installed before the flowmeter. Or install energy-consuming flow conditioners to shorten the length of straight pipe sections. And the effect of doing so is very limited. The gas flow meter itself can effectively and quickly standardize the flow of the pipeline. The powerful rectification effect of the throttling spindle makes the gas flowmeter completely free from the restriction of the front and rear straight pipe sections. Applicable occasions are greatly broadened. Installation costs are greatly reduced.

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