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1. Boiler steam flowmeter, consult experts to determine the problem
Water evaporates into steam, and its expansion ratio is 1860 times under normal pressure. Under different pressures, its density also changes accordingly. Below are the answers to your questions one by one:
1. The steam flowmeter consists of two broad trace parts. The first part is the sensor part, which is commonly known as the flowmeter. The equipment installed on the pipeline includes vortex street, orifice plate, Annubar, pulse and other forms. The second part is the integrated computing device, which includes functions such as calculation and display. It calculates the instantaneous flow rate and cumulative flow rate based on the pulse signal transmitted by the sensor, combined with the pressure signal and positive signal, and also has a recording function. This pressure signal is actually the density corresponding value that has already been set. So, you dont have to worry about density changes affecting accuracy.
2、 The second question has already been clarified in the above answer. The density and enthalpy of water vapor at different pressures are different. You can find it on the soda characteristics table.
3、 Regarding the third question, theoretically speaking, there must be some changes, but in practical operation, the enthalpy value of the dry saturated steam tank under a pressure difference is relatively small, and the desired fuel consumption does not change significantly. According to the law of conservation of energy, the energy output will change, but not significantly, so it is generally ignored in production assessment. In addition, if it is superheated steam, the enthalpy value needs to be calculated. I
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2. What are the commonly used flow meters in chemical industry sites?
According to the widespread application of flow meters (in the market, cost-effectiveness is generally considered), the mainstream flow meters include the following:
1. Vortex flow meter: the most widely used, accurate, sensitive, and inexpensive, especially for steam flow. In recent years, the integrated vortex flow meter with pressure stabilization and compensation has almost become the worlds leading flow meter, but its disadvantage is that it is not shock resistant;
;2、 Electromagnetic flowmeter: used for conductive liquid materials and widely used in factories. It is corrosion-resistant, accurate, sensitive, and has a low failure rate. The disadvantage is that the price is still relatively high, especially for imported brands, which can easily cost over 10000 yuan;
3、 Spiral vortex flowmeter: Similar in appearance to vortex street, but with a different measurement principle. On a small diameter, it has a wide measurement range, better sensitivity than vortex street, weak seismic resistance, and cannot measure dirty media;
3、 Turbine flowmeter: For liquid turbines, the diameter can be made very small, sensitive, and inexpensive. The disadvantage is that the material must be very clean and tidy, and impurities can easily get stuck. It is best to add a Y filter;
4、 Metal rotor flowmeter: accurate, sensitive, intuitive, the disadvantage is that the material must be very clean and tidy, and this flowmeter is also not cheap;
5、 Differential pressure flowmeter: mainly includes orifice plate, Annubar, bent pipe, tail