Electromagnetic flow meter to measure the coal slurry four difficulties

Abstract: the electromagnetic flowmeter measurement of coal slurry four difficulties information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Although the electromagnetic flowmeter can be used for measurement of coal water slurry or mud composition such as complex medium, but because of the special conditions of medium composition, it will still produce certain effect of electromagnetic flowmeter measurement. The following are some of the major difficulties: everyone face first, composition of coal water slurry. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a coal slurry four difficulties electromagnetic flowmeter measurement details. Electromagnetic flowmeter is used widely, there are clients often ask CWM application of electromagnetic flowmeter selection, presentation, here the design of the coal slurry electromagnetic flowmeter is applied, this kind of medium to high to the requirement of electromagnetic flowmeter, needs to explore design points situation. Although the electromagnetic flowmeter can be used for measurement of coal water slurry or mud composition such as complex medium, but because of the special conditions of medium composition, it will still produce certain effect of electromagnetic flowmeter measurement. Everyone here are some of the major difficulties faced: order in coal slurry flow time, users should pay attention to according to the nominal diameter of fluid, working pressure, temperature, flow range, fluid type and environmental conditions to choose the appropriate specifications. When need to display instrument of our company, please refer to the corresponding manuals and choose the suitable model, our technical staff will according to the information you provide for your design and the choice model. First, coal-water slurry composition is complicated, easy to damage the measuring equipment, measurement difficulties because of coal containing iron wire, copper wire and other metal in the process of mining, coal by belt conveyor to the rod mill and ball mill, grinding with additives such as papermaking waste liquid, methanol wastewater, made from coal water slurry, its content is 60% ~ 70%, run for 1250 ~ 1286 kg/m3 density, dynamic viscosity of 700 ~ 3000 cp. When rod mill and ball mill grinding coal, part of the metal particles will fall off, so the follow-up equipment can't completely filter and remove the metal particles contained in coal water slurry. In the process of measuring impact and wear easily to pressure pump and electromagnetic flowmeter, auxiliary equipment damage. Second, the characteristics of coal water slurry medium make it difficult to measuring liquid coal-water slurry and mud - Solid mixed conducting medium velocity, when the solid particles or fiber medium brush through the electrode surface, contact on the surface of the electrode electrochemical potential sudden changes, lead to the electrode electromagnetic flowmeter sensor output signal of the sharp pulse plasma ( Interference) Noise, signal display and output fluctuation, the fluctuation and sensor exciting current frequency spectrum characteristics of the 1 / f. Metal particles of the friction will produce more severe instantaneous sharp pulse interference, eventually lead to serious interference and electromagnetic flowmeter signal measurement is not stable. Third, it is difficult to measure the pressure of the pump when the pump work, inevitably there will be a pulsating flow. “ Screw pump & throughout; Mainly used for coal-water slurry and ordinary boiler combustion pressure. Due to its structure and working mode, the pulsating flow under different rotational speed fluctuation is small ( Volatility is commonly 0. 5% ~ 5%) , generally does not affect the measurement and control applications. However, due to the technical requirement of the gasifier, CWS nozzle need a pump to coal water slurry pressurized to 6 ~ 9. After 6 mpa, in order to achieve the best effect of atomization, even higher, so use & other; Piston pump & throughout; Or & other Diaphragm pump & throughout; 。 Because of its working principle and structure, even under full load condition, the pulsation of the pressurized liquid flow fluctuation is very big also, Volatility is commonly 6% ~ 15%) 。 Coal slurry pump working problems after in the long run, a pulse will further increase, all is unable to monitor the working state of the working chamber in central, only through the electromagnetic flowmeter to reflect of the instantaneous signal display and output fluctuations. Four factors, coal slurry pipeline measurement difficulties gasifier coal-water slurry pipeline generally USES the 20 # carbon steel. When the coal slurry transportation stops, pipe wall will be oxidized, produced a large number of oxidation rust, coal-water slurry in pipeline caused by friction can make tiny carbon steel shed particles in coal slurry and package. Electromagnetic flowmeter work, sensor measuring cavity fields will be magnetized metal particles, the metal particles in the pulp of coal adsorption near the measuring electrode, and the electrode polarization voltage, so as to improve the accuracy of measurement of the electromagnetic flowmeter itself, further increasing volatility, but the problem basic does not exist in the stainless steel pipe. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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