Coal powder mass flow meter

1. When measuring concentration using capacitive or radiation methods, there are minimum requirements for the concentration level. For capacitive methods, this level is usually required to be no less than 50 Kg/m3. The minimum concentration for radiation methods depends on the carrier gas and pressure; when the concentration is lower, the presence of the carrier gas affects the measurement accuracy to an unacceptable extent, creating problems； Capacitive type is not affected by pressure or the carrier gas itself ； For high-concentration areas, the measurement issues can be resolved by adjusting the measurement range of the instrument; therefore, there is no limit on the concentration that can be measured ； Other issues are related to process problems, which experts can address

Is there also a mass flow meter based on electromagnetic fields, and I’m not sure how it works?

The capacitive type operates through the conversion of electromagnetic fields and signals; what you’re referring to is probably this capacitive type I’m talking about. Some manufacturers create complicated terms to confuse people, such as inductive, microwave, or electromagnetic field types – but the basic principle remains the same as that of the capacitive type

Is that type of flow meter for nuclear radiation also based on this principle?

A radial flow meter consists of two parts: 1. a radial type concentration meter to measure the coal powder concentration + 2. a capacitive velocity meter to measure the coal powder velocity； The concentration and velocity signals are fed into the process system to calculate the flow rate ； Traffic is measured indirectly, through calculation ； Since the concentration signal from the radiation concentrator includes influences from the carrier gas and pressure, the system calculates the flow rate by calibrating this value using data from other sensors; the methods of calibration vary among different manufacturers of process packages ；

Flow measurement using instruments is inherently challenging; for a single type of fluid, there are corresponding measurement principles that can be applied. But with a mixture of solid and gas, the fluid is unstable and its density is unstable; any measurement method will yield unreliable results. It mainly depends on whether the algorithm better fits the operating conditions.

Is the density measured by electromagnetic waves or rays not accurate or timely enough?

Measuring gas-solid two-phase flow is indeed a challenge, as both hardware and software requirements must be met. The measurement principle of current mainstream coal powder flowmeters relies on the unstable conditions in gas-solid two-phase flows to function.

These two methods have fast enough response speeds and are accurate enough as well； Feature: Density measurement using electromagnetic waves is affected by the dielectric properties of the material being measured, but it is not influenced by changes in temperature or pressure. If these properties change significantly, it can affect the accuracy of the measurement results; therefore, recalibration or correction is necessary ； Ray density is not sensitive to the dielectric properties of ordinary materials, but the measured ray density value is affected by changes in temperature and pressure (due to the presence of the carrier gas) ； Therefore, each of the two methods has its own characteristics ； Some vaporization furnace process packages make full use of this feature, installing one ray density meter and one electromagnetic density meter on the same pipeline ；