About density correction of mixed gas flow rate measurement

Abstract: The information on the density correction of the mixed gas flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. In metallurgical enterprises, mixed gas is widely used. Due to the change in the density of the mixed gas caused by the fluctuation of the mixed gas ratio in use, a measurement error occurs. In the following, we will discuss this issue in detail, and we hope that it will be further discussed for you. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on density correction of mixed gas flowmeters. In metallurgical enterprises, mixed gas is widely used. Due to the change in the density of the mixed gas caused by the fluctuation of the mixed gas ratio in use, a measurement error occurs. Below we will discuss this issue in detail, and hope that it will have a good effect on everyone's further understanding of the mixed gas flowmeter. 1. Importance of density correction of mixed gas flow rate In metallurgical enterprises, a large amount of gas is produced along with coking, iron-making, and converter steel-making. These gases are important secondary energy sources after cleaning and dust removal. The capacity of the gas pipeline network of each metallurgical enterprise is limited. In the pipeline network with limited capacity, if the gas mixture ratio of some users is relatively well balanced, the gas mixture ratio of other users will be more out of balance. It brings problems to both flow measurement and use. The change of the gas mixture ratio brings difficulties to the flow measurement of the mixed gas and the control of the fuel ratio, which will also affect the heating quality, and may cause environmental pollution due to incomplete combustion. Therefore, the density compensation of the mixed gas flow measurement is very important. 2. How to carry out the density correction of the mixed gas flow measurement of the differential pressure flowmeter The density correction and pressure and temperature correction of the flow measurement are two different concepts. The former refers to the change of the standard state density of the mixed gas caused by the change of the mixing ratio; the latter means that the standard state density of the gas does not change, but the working state density of the gas changes due to the change of working pressure and temperature. 2.1 The simple density correction formula for flow measurement In order to distinguish it from the pressure and temperature correction, the density of the mixed gas when designing the throttling device is used.ρMixed standard design representation; use the density of mixed gas in actual work asρMixed standard work representation, the simple density correction formula for flow measurement is: qVN is the mixed gas flow under the mixed gas under the standard state, and qVN is the mixed gas flow under the actual working condition. 2.2 The standard state density of mixed gas In industrial measurement, two methods are often used to obtain the standard state density of mixed gas (1) Knowing the amount of coke oven and blast furnace gas to obtain the density of mixed gas. Calculate according to the flow rates of coke oven gas and blast furnace gas detected respectively before gas mixing: (2) The method of calculating the density of the mixed gas with the known calorific value of the mixed gas. According to the calorific value of the mixed gas detected by the calorific value meter, the ratio of the flow rate of the coke oven and the blast furnace gas is obtained respectively, and then the standard state density of the mixed gas is obtained.ρV coke % is the proportion of coke oven gas flow; Q high is the calorific value of the blast furnace; Q mixed is the calorific value of the mixed gas; Q coke is the coke oven gas calorific value MJ/m3. 3. How to carry out the differential pressure flowmeter mixed gas Flowmeter pressure, temperature and density correction In order to avoid the confusion between the standard gas density change caused by the change of mixed gas ratio and the working state density change caused by the working pressure and temperature change, the correction formula used for the pressure, temperature and density of flow metering is: The properties of gas in metallurgical enterprises are similar, and each enterprise should carry out the correction of the indication value of the mixed gas flow according to its own gas properties. If the converter mixed gas is used in the production, you can also refer to the above method to correct the indication value, because the principle is the same. The above analysis may not be very extensive and comprehensive. If you have more needs, we will give you a detailed introduction to what you need to know. Our ABG Instruments will use our accumulated experience to help you when you encounter problems. It will also give you the information you need when you need it*. Therefore, I hope that you will take us as your first choice when purchasing products, and we look forward to a pleasant cooperation with you. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 《About Density Correction of Mixed Gas Flow Meters》

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