Application of Vortex Flowmeter in the Measurement of Compressed Air in Taiyuan City Vocational and Technical College Fan Bohong, Xue Hongmin, China Aluminum Shanxi Branch, Hejin 04330, Shanxi, China This paper describes the working principle and characteristics of vortex flowmeter, and introduces the use of type 2 The vortex flow sensor and the 5D 2, 2 intelligent flow totalizer are used to measure the high-pressure wind measurement system, and combined with the experience to put forward reasonable suggestions on the precautions during installation and operation.
Reading key words vortex flowmeter; compressed air; measurement classification number; document identification code article compilation è€16730046 plus vortex flowmeter working principle and characteristics vortex flowmeter is based on the principle of Kamen vortex street to measure the international advanced level The flowmeter, because it has the advantages that other flowmeters can not have, has been rapidly developed since the 1970s. According to relevant information, the proportion of vortex flowmeters in developed countries such as Japan and Europe has risen sharply. Widely used in various fields, it will dominate the flow meter in the future and is the ideal replacement for orifice flowmeters.
The vortex flowmeter is provided with a vertical column in the measuring pipe, and the fluid alternately generates a regular vortex through both sides of the column, and this vortex is also called a Karman vortex street. The release frequency of the Karman vortex street is related to the flow velocity of the fluid and the width of the column. It can be called the Stroha number æ± flow rate by the following formula; 1 The width of the column can be calculated by the formula, and the width of the column and the width of the column 1 Under constant conditions, the frequency of the Karman vortex street is proportional to the flow rate of the fluid. Therefore, by measuring the release frequency of the Karman vortex street, the instantaneous flow rate of the fluid in the pipe can be calculated. The vortex release frequency of the series vortex flow sensor is detected by the piezoelectric element inside it based on the stress that the vortex alternately acts on the detecting sensor.
The measurement system consists of a high-pressure wind flow measurement system consisting of a Shanghai Kent 2 vortex flow sensor and a 12 intelligent flow totalizer. The vortex sensor is mainly purchased by a corner post probe in the sensor with a magnifying plate connecting rod vortex generator assembly, which can be used for the measurement of superheated steam saturated vapor compressed air and general gas. In this measurement system, the vortex flow sensor is mounted on a vertical pipe, which sends a pulse signal corresponding to the high pressure wind flow to the intelligent flow totalizer.
12 intelligent flow totalizer adopts advanced single-chip technology, which can be used for flow measurement with street elimination sensor or orifice flow sensor. It has full Chinese LCD display screen, which can display the accumulated heat vortex frequency of heat accumulated flow without instantaneous flow. A variety of information such as medium pressure temperature density time and date, as well as a wealth of functions such as small flow automatic compensation for stop current compensation and automatic copying. The temperature and pressure signals can also be automatically compensated for temperature pressure. It will come from the flow sensor and output a 4,20 signal proportional to the instantaneous flow to facilitate the same connection.
Precautions in use Proper installation of the sensor is the primary prerequisite for ensuring accurate and reliable measurement. If the error in the installation location and mode selection affects the measurement accuracy, it will affect the service life of the sensor and even damage the sensor.
To ensure the proper installation of the sensor in the straight pipe section, the length of the upstream straight pipe section is required to be 1540. Where the length of the downstream section is 5, it can be adjusted according to the condition of the upstream and downstream pipelines to ensure the measurement accuracy. The sensor should also avoid installing the sensor on the very long overhead pipe. After a long time, the sensor sag is easy to leak the seal between the sensor and the flange. If it is necessary to install, it must be at the upstream and downstream of the sensor. Set fastening devices such as pipe brackets.
The sensor should be installed on the pipe with strong vibration. If it has to be installed, vibration damping measures must be taken. Pipe fastening devices are installed at the upstream and downstream of the sensor, and the vibration is stronger at the exit of the air compressor. The sensor cannot be installed and should be installed behind the gas tank.
According to the measuring fluid, choose the appropriate installation method. When measuring the high pressure wind, you can choose to install the sensor on the horizontal pipe or vertical pipe. However, if the water content in the high pressure wind is high, the sensor should be installed in the pipeline when the horizontal installation is high. At the point of vertical installation, the gas flow direction should be from bottom to top. Regardless of the horizontal or vertical installation, the fluid flow must be maintained with the flow arrow on the sensor body. The external environment requires that the sensor be installed in a place where the temperature changes greatly and the thermal radiation range of the device. If it must be installed, it should be insulated. Ventilation measures. When installing in a humid environment containing corrosive gases, moisture and isolation measures must be taken. In addition, because electrical noise can interfere with the correct measurement of the sensor, the installation location should be away from interference devices such as high-power transformer motors.
艮12 intelligent flow totalizer has a good Chinese interface for user convenience. Correct parameter setting is to ensure that the measurement accuracy measurement does not require pressure temperature compensation. Therefore, the measurement signal is set to the volume flow rate under the working state, the input signal selection frequency, and the unit of the instantaneous flow rate is also default, and no user setting is required.
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