在焦炉煤气流量测量中的应用过去，在测量焦炉煤气流量时一直使用标准孔板，由于焦炉煤气脏，孔板容易污染，而且仪表导管易堵，必须定期用吹扫装置进行吹扫，否则会影响测量精度，甚至系统不能正常运行；此外，焦炉煤气中所夹带的蒸汽或水雾，涡轮流量计当温度降低时易凝结成水，在管道中很难排除，影响系统的测量精度。 Application of V-cone flowmeter in coke oven gas flow measurement. In the past, standard orifice plates have been used when measuring coke oven gas flow. Because the coke oven gas is dirty, the orifice plate is easy to contaminate, and the instrument duct is easy to block. It must be regularly purged. The device is purged, otherwise the measurement accuracy will be affected, and the system may not operate normally. In addition, the steam or water mist entrained in the coke oven gas, the turbine flow meter is easy to condense into water when the temperature is reduced, and it is difficult to exclude it in the pipeline. Affects the measurement accuracy of the system. Moreover, the straight pipe section of the orifice plate flowmeter is required to be long, and the diameter of the gas pipeline is usually relatively large, and it is difficult to ensure a long straight pipe section.
The V-cone flowmeter has a self-blowing structure design feature and no dead zone. The medium will accelerate as it flows through the cone, constantly flushing the positive pressure tapping hole, the outer wall of the cone and the pipe wall near the cone, while the negative pressure tapping hole is isolated by a small section of non-flowing medium, and dirty impurities cannot enter. Therefore, the conical flowmeter can be used for various dirty media containing impurities and easy to crystallize, such as coke oven gas, generator gas and other media. During the measurement of coke oven gas flow, the measurement object is usually a large pipe diameter, low pressure, and slow flow rate. The v-cone flowmeter usually has a large differential pressure value and small resistance loss. Therefore, when the resistance loss is the same, when designing A v-cone flowmeter with a large differential pressure can be selected. Maybe you are also interested in our metal rotor flowmeter.
作为新型节流装置，近年来被炒之过热。 As a new type of throttling device, the V-cone flowmeter has been overheated in recent years. Low pressure loss and high accuracy are the key points of its call compared to other standard throttling devices. But does the V-cone flowmeter really have such a high measurement advantage as it is said now? The following are the technical characteristics of the mutual restriction of the V-cone flowmeter summarized by the author with reference to relevant data and field installation experience.
1. I should have read the V-cone technical manuals of many manufacturers on the site. The β value above may not be of much concern to you. Many manufacturers' labels are in the range of 0.4-0.9. But in fact this and the low requirements of the straight section are contradictory. After a long-term experiment in our factory, if you want to meet the high-precision measurement requirements under the lower requirements of straight pipe sections, the β value must meet the range of 0.45-0.6, but then there is another problem If the diameter of the cone is in this range, the pressure loss is only 90% of that of a standard orifice plate, so the statement that the pressure loss is small is lost. And as suggested by some manufacturers, the value is more than 0.8. In this case, the pressure loss can be reduced to half of the standard orifice plate, but the rectification effect is lost, and the characteristics of low straight pipe requirements on the site are also lost.
2, is the rationality of taking the pressure point. 的人都知道，正压取压直接就是取的现场管道的压力，虽然V锥锥体本身有整流的作用，但是对正压取压却只能望而却步，起不到半点作用，所以如果现场前面直管段要求不够的话，正压取压同样取不到具有代表性的静压。 Anyone who has used the V-cone flowmeter knows that the positive pressure is directly taken from the on-site pipeline pressure. Although the V-cone itself has a rectifying effect, it can only be discouraged from taking positive pressure. Function, so if the requirements of the straight pipe section in front of the site are not enough, the positive pressure can not take the representative static pressure. Therefore, no matter what kind of flowmeter, it is definitely not a panacea, and it can only adapt to certain areas and obtain better measurement results.