Case introduction
The advantages of thermal gas mass flow meter are: measuring the mass flow rate of gas, high accuracy, low pressure loss, suitable for large caliber, high range ratio, good performance in measuring small flow rate of gas, and insensitive to pressure change; these advantages indicate that thermal gas mass flow meter is suitable for the measurement of boiler air volume. Due to the above advantages of thermal gas mass flow meter, it is widely used in boiler air volume measurement. Thermal gas mass flow meter has application technology method when measuring boiler air volume, if the method is not proper, its use effect will be affected.
As the boiler wind measurement study is mainly in the primary air, secondary air, flue and desulfurization and denitrification parts, these parts of the duct size, shape, before and after the length of the straight pipe section and the duct bending condition, the wind temperature are not the same, so the wind measurement is more complex, to summarize the various situations, the application of the thermal gas mass flowmeter in the boiler wind measurement is related to the following factors.
- 1、As the duct cross-section size is relatively large, the wind speed distribution in the duct is very different, and thermal gas mass flow meter belongs to the velocity type flowmeter, in the measurement of the cross-section, the distribution of the movement of the gas velocity is more sensitive, so the measurement results are related to the location of the instrument sensors, in the practical application of the instrument can be taken to a number of meters, in the same cross-section measurement of their respective air volume, the final result of the final results with the weighted average or the average of the The final result is calculated by weighted average or averaging method of the air flow of the duct.
- 2、The length requirement of the front and rear straight pipe section is due to the calibration instrumentation is carried out in the front and rear straight pipe section is sufficiently long, the general requirements of at least ten before and five after, but in the actual application of the boiler wind measurement is almost impossible to achieve, so such as measurement deviation is large, most of them are dealt with by the method of on-site calibration fitting.
- 3、In the measurement of primary wind, in order to get the required primary wind temperature, to use cold and hot air mixing method to regulate the wind temperature, in the actual system, cold and hot air mixing duct is very short, so that the cold and hot air can not be fully mixed, and thus the duct, the wind temperature temperature temperature gradient is very large in the mixing of the measurement of the duct in the wind flow will be a measurement error can be considered to measure the wind flow of cold and hot air respectively, and then seek the sum of the wind volume can consider using cold and hot air to measure the air flow separately, and then find the sum of the air volume method to solve.
- 4、When measuring the air flow in the flue, desulfurization and denitrification parts, the gas flow rate is often used to express the gas flow rate, which can be solved by setting the pipeline area and instrument coefficients in the instrument parameters, so that the realistic gas flow rate value is consistent with the wind speed. The above is the thermal gas mass flow meter manufacturer for you to share the "thermal gas mass flow meter applied in the boiler can?"
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