Coal water slurry of electromagnetic flowmeter measurement applications

At present, the technology of oxygen flow measurement technology has enough mature. But the new coal chemical technology and bad changeful condition on site, monitoring in special condition of coal water slurry medium flow instability always confused with each coal chemical enterprises and flow meter manufacturers. Therefore, to conquer technical problems of coal chemical engineering with CWS flow monitoring became many meter manufacturers goal. By numerous meter manufacturers and coal chemical enterprises to jointly develop, research, selection and application, consistent summed up; So far, the speed type measuring principle & other Serum type electromagnetic flowmeter & throughout; A good flowmeter measurement of coal chemical industry coal-water slurry flow. But there are in the process of electromagnetic flowmeter actually use power frequency interference, fluid characteristics of electrochemical noise interference rush-hour, power supply interference, caused a corresponding coal-water slurry measurement difficult. 1. Coal chemical industry of coal water slurry measurement difficult point 1. 1 because of coal in CWS compound containing iron wire, copper wire and other metal scrap in the process of mining, through the belt conveyor in the rod mill and ball mill, grinding and paper waste liquid, methanol wastewater such as additives, the generated content is 60% ~ 70%, the density of operation for 1250 ~ 1286 kg/m3, dynamic viscosity of 700 ~ 3000 cp coal-water slurry. Rod mill and ball mill grinding coal collision will further fall off part of the metal particles, the follow-up equipment can't completely filtration, removal of metal particles is contained in coal water slurry, in the process of measuring the impact and wear cause pressure pump and other measuring advocate complementary equipment is easy to damage. 1. 2 coal-water slurry medium characteristics influence on the measurement of coal water slurry and mud liquid and solid two-phase mixture conductivity medium flow rate, the solid particles or fiber brush electrode surface, on the surface of the electrode contact electrochemical potential changes suddenly, causing the electrode from the sensor output signal spike pulse slurry ( Interference) Noise, it will cause display and signal output volatility, volatility amount and sensor of exciting current frequency spectrum characteristics of 1 f. Metal particles friction produces more severe instantaneous peak pulse interference, * end signal interference by electromagnetic flow caused by severe unstable measurement. 1. The influence of the three pump pump work is an oscillating flow is inevitable. Made in coal water slurry and ordinary boiler combustion pressure link basically adopt & other; Screw pump & throughout; , because of its structure and working mode under different rotational speed pulsating flow fluctuation quantity is small ( The amount of fluctuation in 0. 5% ~ 5%) , usually does not affect the measurement and control applications. While & other; Texaco & throughout; CWS gasifier due to its technical requirements, the need to pump the coal-water slurry pressurized to 6 ~ 9. 6 mpa can achieve ZUI better atomization effect, even higher in the future, so use & other; Piston pump & throughout; Or & other Diaphragm pump & throughout; , because of its working principle and structure of even in the case of full pressure with the pulsation of the fluid flow fluctuation quantity is very big, Fluctuations in 6% ~ 15%) , coal slurry pump after long-term job if one cavity work appear problem, will further strengthen its pulsating quantity, and each work condition of the working chamber can't monitor in the central control room, can only be reflected in the instantaneous flow meter display and signal output fluctuations. 1. 4 the influence of coal slurry pipeline gasifier device of the coal water slurry pipeline generally USES 20 carbon steel material. In stop stage of coal slurry transportation pipeline wall can produce lots of oxidation rust, oxidation of coal water slurry pipeline wall friction will fall off of tiny carbon steel clever grain, wrapped in coal slurry. Electromagnetic flowmeter at work when the sensor measuring chamber of magnetization of the magnetic field can make the metal particles, allowing the slurry of metal particles adsorption near the measuring electrode, the electrode polarization voltage formation, raises the accuracy of measurement of the electromagnetic flowmeter itself and further increasing the volatility. The stainless steel pipes basic does not exist the problem. 2. The application of slurry type electromagnetic flowmeter study 2. 1 special installation requirements of electromagnetic flowmeter electromagnetic flow meter installed in strict accordance with the requirements of installation, and as much as possible to install the 3 sets of electromagnetic flowmeter in the stove top. Extended straight pipe flowmeter, a former is caused when solving the coal slurry pump work ZUI preferred way of pulsation.

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