Application of Integrated Annubar Flow Meter in Gas Flow Measurement

Abstract: The application information of integrated Annubar flowmeter in gas flow measurement is provided by excellent flowmeter and flowmeter manufacturers. In the metallurgical industry, coal gas is an important secondary energy source. The accurate measurement of its instantaneous flow and cumulative flow not only affects the control effect of the relevant control system, but also is an important basis for the internal market operation and cost accounting of the enterprise. Henan Henan. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of the integrated Annubar flowmeter in gas flow measurement. In the metallurgical industry, coal gas is an important secondary energy source. The accurate measurement of its instantaneous flow and cumulative flow not only affects the control effect of the relevant control system, but also is an important basis for the internal market operation and cost accounting of the enterprise. Henan Yuguang Zinc Industry Power Branch is responsible for the management and maintenance of the whole plant's gas pipeline network. On the premise of analyzing the components and working conditions of the gas, the experience of using other gas flow metering devices was investigated and summarized, and six sets of online-installed integrated Annubar flowmeters were installed, and the gas flowmeter was constructed based on it. Flow detection system. After a year of operation, the monitoring and metering of the gas pipeline network of the whole plant has been successfully realized. 1. Proposition of the problem In the production of metallurgical enterprises, whether it is blast furnace gas or converter gas, the content of impurities such as moisture and dust is relatively high, and it is easy to produce agglomerated deposits. In addition, the diameter of the gas pipeline is large, the operating pressure is small, and the gas flow rate in the pipeline is small, which makes the flow measurement difficult. Although the orifice flowmeter is simple to process and install, its range ratio is small, the precision is low, and the pressure loss is large, which cannot meet the precise measurement of gas. Due to its poor blocking resistance and low differential pressure, the previously used rhombus bar has to be shut down for maintenance, which affects the normal production and operation, so it cannot meet the requirements. 2 Features of online-installed integrated Annubar flowmeter This flowmeter is a product of Rosemount Corporation in the United States. It uses the principle of differential pressure to detect flow, which very well solves all the problems of orifice flowmeter in large-diameter flow measurement. It has the following features. 2.1 T-type anti-blocking design The cross-section of the flow meter throttling piece has a unique T-type anti-blocking design structure as shown in Figure 1. During operation, the fluid medium produces a high-pressure area on the flat front of the throttling member, and the granular impurities in the fluid are deflected to bypass the high-pressure area and flow out of the stagnation area of ​​the low-pressure pressure-taking port on the back of the flat. The granular impurities are difficult to block the pressure-taking hole. , thereby reducing the probability of blockage in the high and low pressure areas. The adsorption of some impurities will not cause the catastrophic measurement error of other various uniform velocity tube flowmeters to its measurement accuracy. Some data show that when the non-viscous dry impurity content in the fluid is not more than 6500mg/m3, it has almost no effect on the T-type Annubar flowmeter. Figure 1 T-type anti-blocking design (white is high pressure area, blue is low pressure area) 2.2 The velocity distribution of the fluid in the grooved pressure-taking hole is uneven on the cross section of the pipeline, and an accurate velocity flow meter needs to obtain the correct fluid average flow rate. The pressure-taking hole on the high-pressure side of the throttling part of the flowmeter is a groove design. The length of the notch spans the cross-section of the entire gas pipeline, and the sampling rate of the fluid reaches more than 85%, which is 12 times higher than that of the previous throttling parts. The sampling area of ​​the flow rate is above, thus obtaining a more accurate measurement result of the average flow rate and a larger flow differential pressure value. Figure 2 Signal strength of relative differential pressure (abscissa) 2.3 During online plug-in installation, maintenance and installation, install a specially designed mounting base and isolation valve above the pipeline, then drill holes on the pipeline through the isolation valve and install the integrated Aniu bar flowmeter. Due to the existence of the isolation valve, installation and maintenance can be carried out without stopping the gas operation. Since the frontal high-pressure pressure-taking notch of the T-type Annubar flowmeter spans the entire pipeline, while improving the average measurement accuracy of the fluid, it also greatly reduces the installation requirements of the T-type Annubar flowmeter. Allowed in the X, Y, Z three-axis direction±5o deviation,±The deviation of 5o can be clearly judged by human eyes, and it is easier for installers to install and debug. 2.4 Real-time dynamic temperature and pressure compensation integrated Annubar flowmeter has built-in differential pressure transmitter with 0.065% accuracy, pressure transmitter with 0.065% accuracy, temperature transmitter, high-speed CPU and large-capacity data storage. The built-in large-capacity data memory stores the physical data that various fluids need to use in the calculation formula at different pressures and temperatures, including density, viscosity, gas constant, compressibility, constant volume specific heat, etc., according to the actual change of the fluid. Working pressure and temperature, take out the corresponding data from the database and put it into the compensation formula for calculation. This flow calculation formula also compensates for various influences such as thermal expansion and contraction of the central hole of the pipeline under different temperatures and pressures, which eliminates the factors that cause flow measurement errors to the greatest extent. 3 Problems to be paid attention to when using the Annubar flowmeter (1) The mechanical size of the Annubar flowmeter must be tailored according to the size of the pipeline to be installed. The parameters provided by the user must include the outer diameter of the pipeline, wall thickness, and common flow rate. and other related parameters, the calibration of the flow measurement range in the manufacturing process of Annubar is completely calculated and set according to the data provided by the user. Therefore, if flow data and pipe dimensions are provided based on experience and impressions, large measurement errors will result.

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