Flue gas là gì



Recently, air pollution legislations such as the Clean Air Act lớn reduce the amount of air pollution are increasing worldwide. The Clean Air Act address numerous air chất lượng problems. One of these problems is acid rain caused by sulfur dioxide & nitrogen oxide emissions from fossil-fueled power plants và other industrial & transportation sources. Sulfur oxides and nitroren oxides (NOx) are recognized as harmful pollutants and great efforts are underway lớn remove sầu these toxic gases. Under emission regulatory requirements và legislation khổng lồ reduce the emission of these air pollutants, power plants in particular have installed "flue gas desulfurization systems" also known as scrubbers.quý khách vẫn xem: Flue gas là gì


Flue Gas Desulfurization


Wet flue gas desulfurization or scrubber systems are an excellent way of reducing the sulfur dioxide emissions caused by coal combustion boilers. The flue gas discharged from the boiler is fed inkhổng lồ the absorber. In the absorber, a mixture of water and pulverized limestone is sprayed on the flue gas. The limestone slurry absorbs the sulfur dioxide (SO2) contained in the flue gas reducing the emission of sulfur. The limestone reacts with the SO2 khổng lồ produce calcium sulfite. The calcium sulfite then reacts with oxygen & is then finally removed as gypsum. The limestone slurry and gypsum slurry are very abrasive. Magnetic flowmeters are normally used khổng lồ measure & control the flow of the limestone slurry to lớn the sprayers.

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Conventional style PTFE-lined magnetic flowmeters used in such applications normally have a short life expectancy, due lớn the abrasiveness of the slurry. The use of non-retained liners & electrodes that expose their seal lớn the process fluid/slurry make the meters prone khổng lồ fail. Once the liner wears away or the seal around the electrode is eroded, the process fluid can then attachồng the meter's internals (coils & electrode wiring).


Also, the use of electrodes that protrude inlớn the process can create an increase in slurry noise as the limestone or gypsum collide with the electrode. In slurries, noise (voltage) is generated when solid substances collide with the electrode. Conventional electronics cannot distinguish the noise from the true flow signal and thus the flowmeter's output is erratic and the signal is not suitable for control purposes.


The ADMAG AXF magnetic flowmeter is an excellent choice for this application. Since luyenkimmau.com.vn uses a retained liner và an insertion style electrode that removes the sealing surface from the process fluid, service life is dramatically increased. The potential for slurry noise due khổng lồ the limestone & gypsum colliding with the electrode is reduced due to lớn ADMAG's flush electrode kiến thiết.

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In addition, ADMAG's dual-frequency excitation và further optional enhanced dual frequency excitation provides a stable and more accurate measurement than conventional style meters due to lớn its high frequency sampling rate và its ability to filter out slurry noise.

An ideal installation for the measurement of a limestone slurry is to have sầu the flow running up and khổng lồ have the operating velocity between 1.5 khổng lồ 3 m/sec (5 to 10 ft/sec). This keeps the limestone suspended in the water và the wear on the liner to a minimum. The use of a metal hat earth ring can also reduce erosion of the liner by protecting the leading edge of the liner. Where these installation recommendations cannot be met, a ceramic-lined meter should be considered. The ADMAG ceramic meter would be well suited for such applications due to lớn the abrasion resistance of its liner & the reduction of slurry noise due lớn the flush & fused platinum electrode.

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Further the ADMAG CA, capacitance type magnetic flowmeter, which is ceramic lined và has no wetted electrodes provide ultimate solutions of abrasion resistant & immune to slurry noise.


Molded, mechanically retained PFA linerFlush electrode designNo exposed electrode seal(Enhanced) Dual-frequency excitationExcellent slurry performance