Talking about the Application of Differential Pressure Flowmeter in the Measurement of Coke Oven Gas

For on-site parameter selection flowmeters, we must first understand the physical properties of the fluid, because we only understand the characteristics of the fluid in order to better select the appropriate flowmeter for the process, today we talk about differential pressure flowmeter in the gas measurement On the application. Differential pressure flowmeters actually have a long history of gas measurement. In the early days, the use of circular orifice plates was more common. First of all, first introduce the main features of the gas flow measurement:

1. The hydrostatic pressure is low, the flow velocity is low, and the pressure loss is allowed to be small. Generally, the method of reducing the tube diameter is not allowed to increase the flow velocity. According to this feature, generally choose the venturi with smaller pressure loss, commonly used V cone flowmeter, V cone flowmeter because it continues the advantages of venturi and annular orifice, so in this occasion is very suitable for measurement

2, the high humidity of the fluid, some measuring objects also have a small amount of water, in the bottom of the pipeline to do stratified flow

3. Some measurement objects have high hydrogen content and low fluid density. When the flowmeter is measured with a frequency output, the signal is weak.

4. The gases produced by gas furnaces, coke ovens, etc. are generally sticky and some contain less dust. According to this feature, previously used round hole plate is generally used, but with the continuous improvement of the data of the V-cone flowmeter, when measuring the gas containing impurities, the advantages of the V-cone flowmeter are reflected, and the pressure loss is small. Blocking is good.

5. When the measuring point is located at the outlet of the compressor, there is still a certain flow of the artery. In this case, the frequency output vortex flowmeter cannot be applied.

6, the fluid is flammable and explosive media, the instrument itself has explosion-proof requirements

7, from small to large have a variety of diameters

In view of the above characteristics, the use of differential pressure flowmeter to discuss with you under the following: First, on the gas containing impurities, also described above, before the scene mainly used round hole plate, but now widely used is still V-cone flowmeter and wedge flowmeter, the main advantages are not elaborated here too much

The second problem is the large range of gas measurement. As we all know, the normal measurement range of orifice flowmeters is 3:1. Therefore, the method of parallel pipeline measurement at the site is to make up for the problem of a small range ratio of the flowmeter.

For the measurement of large-diameter pipeline gas, it is mainly measured by plug-in flowmeters. Commonly, there are Annuuba flowmeters and Weiliba flowmeters. They have economic comparisons for large-diameter pipelines in gas measurement. Good advantage.

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