Analysis of Main Problems of Throttle Orifice Flow Meter
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Release Time：2022-06-08
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. When the fluid flows in the pipe, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost. This phenomenon is thermodynamically called throttling. This method is simpler than using a regulating valve, but it must be appropriate, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. When the fluid flows in the pipe, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost. This phenomenon is thermodynamically called throttling. This method is simpler than using a regulating valve, but it must be appropriate, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
The working principle of the orifice plate: the fluid filled with the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling element, increasing the flow rate, and causing a static pressure difference between the upstream and downstream sides. Under the condition that the relevant parameters are known, according to the flow continuity principle and Bernoulli equation, the relationship between the pressure difference and the flow rate can be derived, and the flow rate can be obtained.
In the process of measuring industrial flow with a flowmeter, its energy consumption mainly comes from the specific application of the flowmeter. In the traditional industrial flow measurement, the orifice plate flow meter is typical. However, this instrument has problems such as high energy consumption and inconvenient installation and maintenance. Therefore, in order to effectively realize the energy-saving optimization of the flowmeter, it is necessary to analyze its energy-saving technology in depth and replace the traditional flowmeter with advanced orifice flowmeter.
In the traditional industrial flow measurement process, the orifice flowmeter is widely used. The main working principle of this flowmeter is to let the liquid pass through the throttling device. Due to the limited space in the throttling device, after the fluid enters the device, it will shrink into a bundle at the position of the intercepting orifice plate, thereby accelerating the flow rate and reducing the net pressure, forming a pressure difference before and after the throttling orifice plate, which is proportional to the actual flow of the fluid. This kind of orifice flowmeter has been used in industrial enterprises for a long time, with wide adaptability to fluids, perfect application system and very mature technology.
However, in practical applications, there are still many problems in the orifice flowmeter. First, the structure of the device is heavy. The weight of this flow device is approximately100Kilograms. All pipes in the device shall be installed as a whole and shall be matched with lifting machinery and other mechanical equipment when used. There are also high requirements for installation, and construction and maintenance are difficult. Second, there is a significant degree of permanent pressure loss as the fluid passes through the orifice plate flow device. According to the relevant test, the permanent pressure loss can reach2050k pa. When the measured fluid passes through the orifice plate flow device, under the driving action of the electric pump, it will be accompanied by eddy current, resulting in continuous friction between the liquid and the device, and then the mechanical energy of the fluid itself will be converted into heat energy, and then in the form of water vapor Disappear from the measured fluid. Therefore, the consumption of materials and electric energy may increase.
In summary, in order to effectively realize the energy-saving optimization of the flow meter, it is necessary to conduct in-depth analysis of its energy-saving technology, and replace the traditional flow meter with advanced flow meter.
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