Arrangement and Selection Skills of Air Volume Measuring Devices

Abstract: The information on the layout and selection skills of the air volume measurement device is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With the advancement of control technology, online detection and coordinated control of the load, fuel volume and air distribution volume of power plant boilers have been achieved. The amount cannot be accurately measured. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. With the advancement of control technology, online detection and coordinated control of the load, fuel volume and air distribution volume of power plant boilers have been achieved. The amount cannot be difficult to measure accurately, resulting in boiler load. The air volume and fuel volume cannot be put into automatic operation, resulting in unstable combustion, uneven flue gas flow, reduced boiler efficiency, and insufficient ventilation of the coal mill causing blockage, etc. 1. Basic form and characteristics of boiler air measurement device And practice has proved that the ventilation volume and the pressure difference provided by the wind measuring device satisfy the following formula: Q=K*(PH) 1/2 where Q---the air volume through the section where the wind measuring device is located kg/SP---airflow velocity kg /m3H---pressure difference provided by the wind measuring device Pak---flow coefficient of the wind measuring device The flow rate has a linear relationship with the square root of the pressure difference provided by the air measurement device. The air volume measurement system is based on this linear relationship and converts the actual air volume through the pressure difference provided by the air measurement device. The air measurement element used for the measurement of the boiler ventilation volume It is a non-standard component and needs to be calibrated before use to determine its flow coefficient. The duct-type venturi has a simple structure, is easy to install, and outputs a stable and reliable flow signal. However, because of its long body, it needs to occupy a large space, and it is difficult to arrange it in a large air duct. The airfoil-type wind measuring device is relatively short, the pressure measuring space is large, and the mechanism is complex. The flute-type wind measuring device has a simple structure and will not cause pressure loss, but the flow signal provided is weak, and the slight change of the air volume is not easy to show. The double venturi (insertion type multi-throat) is small in size, easy to install, does not cause pressure loss, and can provide a strong flow signal, but requires high stability of the flow field. Once the flow field is unstable, the flow rate provided The signal is unstable. Bar type (Viliba, Chaoliba, Annuba) has a simple structure and is easy to install. The measurement range is a line running through the air duct, and the average value of the measurement points on the line is taken, and the pressure loss of the wind field is small. 2. Causes of linear distortion of the wind measuring device According to the theory, the flow signal of the wind measuring device, when the wind measuring device is in a stable flow field, the flow coefficient in the above formula is constant, and the flow through the cross-sectional area where the wind measuring device is located is the same as The square root of the pressure difference provided by the air measuring device has a linear relationship. The air volume measurement system is based on this linear relationship and converts the actual air volume through the pressure difference provided by the air measuring device. Standard components need to undergo standardized calibration before use to determine their flow coefficient. This is the so-called on-site calibration, but the stability of the wind field is inseparable from the layout of the pipeline, which requires the upstream of the wind measuring device. If there are enough straight pipe sections, the wind passes through the straight pipe section and the wind field tends to be relatively stable. If the straight pipe section is not considered, it is impossible to require the wind measuring device to accurately reflect the change of air volume. This is the misunderstanding of the current air volume measurement. Often when analyzing the inaccurate air volume measurement, the root cause cannot be traced. Operation practice has proved that the measurement accuracy of several commonly used air volume measuring devices can meet the boiler ventilation volume and control requirements, but due to the complex structure of the boiler unit, the arrangement of the air measuring devices is often limited. The design institute belongs to two majors, which creates a disconnect in design, which leads to major flaws. The actual measurement data show that the flow characteristics of the wind measuring device are mainly affected by the change of the damper upstream of the wind measuring device. The damper is the main means to adjust the air volume. The eddy current is always formed downstream of the damper. The distribution in the air duct also changes accordingly. When the distance between the wind measuring device and the damper is too small, the smoothness of the wind measuring device will be disordered, and the measured flow signal will be distorted. The damper located downstream of the wind measuring device has relatively little influence on the characteristics of the wind measuring device.

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