Steam flow measurement
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Regarding steam flow measurement, let’s discuss the option of using an integrated throttling device along with an external integrator for measurement, as well as the use of ordinary orifice plates along with the DCS’s built-in compensation module for measurement. Please discuss the advantages and disadvantages of these two methods of measurement
There’s no big difference; it’s necessary to use parameters that suit the settings. If we must point out any difference, then if the DCS isn’t accurate, it can only be attributed to poor formulation of the formulas, while for accumulators you can turn to the manufacturer~
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Vortex flowmeters are still better; orifice plates have poor throttling accuracy
Integrated flow control devices – aren’t they just plate meters like ordinary ones, with the same sensors? It’s not possible to compare their advantages and disadvantages. It is recommended to upload the data from the integrator directly to the DSC.
For saturated steam, by using a multi-parameter vortex flow meter directly, the mass flow rate of the steam can be obtained directly. For measuring volumetric flow rate using throttling, and then calculating the mass flow rate of steam through certain compensation measures, it doesn’t matter what specific method is used, as long as that method is mature and reliable.
Vortex flow meters measure mass flow rate, while throttle elements measure volume flow rate – is that a correct summary?
Is there anyone knowledgeable who can explain the classification of steam in power plants, as well as the best methods and components for measuring it?
The vortex flow meter also measures volumetric flow rate; however, it can be converted into mass flow rate through temperature and pressure compensation. In other words, after all internal compensations are carried out, the value transmitted is that of the mass flow rate.
Steam is superheated steam; the integrator can incorporate temperature and pressure compensation, and vortex flow meters can also provide pressure stabilization compensation. All of these functions can be integrated together. The integrator and vortex flow meter can output signals of 4-20 milliamps, or they can use a 485 interface for communication
Vortex flow meters and orifice plates are both volume flow meters. Using an integrator requires adding temperature and pressure transmitters to continuously compensate for the flow rate based on the actual pressure and temperature. The built-in compensation element used is the internally set temperature and pressure, that is, a pressure and temperature that do not change. For accurate measurement, an integrator should be used