Application of Vortex Flow Meter Gas

Vortex flow meter gas is mainly used for industrial pipeline gas, liquid, steam and other media measurement, which is characterized by small pressure loss, large range, high accuracy, in the measurement of the working condition of the volume flow is almost independent of the fluid density, pressure, temperature, viscosity and other parameters. No moving mechanical parts, so high reliability, low maintenance, instrument parameters can be stable for a long time. Use steam flow meter vortex type is mainly used for steam, water, nitrogen, and raw materials flow measurement.

Scope of Application of Vortex Flow Meter Gas

Vortex flow meter gas is suitable for measuring the volume flow of liquids, gases, steam and other fluids which are single-phase, clean without pulsation and vibration, with the Reynolds number of 2 × 10^4 ～ 7 × 10⁶, the viscosity ＜20 mPa-s, and the volume flow rate of liquid, gas, steam and other fluids which are 10∶1 ～ 25∶1. When measuring the volume flow rate of natural gas, gas and other fluids, should be used to rotate into the vortex flow meter. steam flow meter vortex type has a small pressure loss, simple and solid structure, no moving parts and easy to install and maintain, etc., and at the same time has a variety of diagnostic functions.

Steam flow meter vortex type is not suitable for measuring low static pressure, dirty media flow; not suitable for measuring low Reynolds number ( Re ≤ 2 × 10 ^ 4 ), high viscosity, pulsating flow, low velocity fluid flow.

Steam Flow Meter Selection and Design

Steam is divided into superheated steam and saturated steam. For superheated steam flow measurement requires temperature and pressure compensation; saturated steam requires only temperature or pressure compensation. In the two compensation methods, the priority choice of pressure compensation, design selection method and gas selection is basically the same. The most commonly used orifice plate flowmeter in previous projects. Compared with the orifice plate flow meter, steam flow meter vortex type has the advantages of small pressure loss, do not need to lead the pressure pipe valve parts; do not need to accompany the heat pipe, thermal insulation box; installation is simple, low installation and operating costs and so on. It is widely used in petrochemical projects due to its high cost performance.

Scientific Selection of Vortex Flow Meter Gas

Vortex flow meter gas can be divided into 3 types according to the sensors, i.e. flange type, clamping type and insertion type. Priority should be given to the flange type, which is more widely used, and then the clamping type should be considered. Clamping type flow meter, insertion type flow meter in the installation is very easy to affect the accuracy, and once the installation is not scientific and standardized, will cause the measurement is not accurate, error phenomenon. Insertion type steam flow meter vortex type is mainly used in occasions that do not require precise control and measurement.

Vortex flow meter gas is also divided into integral type and split type. If the meter is installed in high temperature or in high altitude or wells, the split meter is usually applied, the main purpose is to improve the working environment of the meter, and convenient maintenance of the meter. In the implementation of the integrated instrumentation process, you need to leave enough space around the installation point, the purpose is to facilitate the installation of wiring, as well as to make future maintenance work more convenient.

Temperature and pressure compensation of Vortex Flow Meter Gas

Gases are compressed fluids and changes in their volume state are mainly due to changes in temperature and pressure indicators. The measurement of gas flow requires on the one hand an accurate output of the standard volume flow rate and on the other hand an output of the mass flow rate. And vortex flow meter to measure the volume flow, need to ensure that it is in the working conditions of the environment to carry out the measurement, so vortex air flow sensor for general gas, steam measurement process, should take into account the full range of temperature and pressure compensation function, and carry out a reasonable instrument selection. The temperature and pressure compensation can transform the working condition volume flow rate into mass flow rate, or into other volume flow rate, i.e. standard volume flow rate.

In the process of steam measurement, the work that needs to be done is the saturated vapor compensation, which is applied in two ways, one is pressure compensation and the other is temperature compensation. Usually there are two specific compensation modes, namely: if the vortex flow meter sensor does not have a temperature detection element and built-in pressure, only static compensation can be implemented within the instrument, that is, the compensation is to take a fixed pressure value, the temperature value of the input way to realize. This mode is suitable for situations where there is no significant change in temperature and pressure. vortex flow meter sensors with a temperature detection element and built-in pressure, the instrument takes into account the results of the measured temperature and pressure to grasp the state of the steam and to determine whether the steam is superheated, saturated or saturated.