During the drying operation, the discharged gas or liquid may sometimes cause pollution to the environment, and measures can be taken to eliminate the pollution.
Dust pollution The discharged gas contains dust, which may exceed the standards of environmental protection regulations and cause pollution to the environment. At this time, a two-stage dust removal method can be used, that is, the first stage uses a cyclone separator and the second stage uses a bag filter, and the dust removal efficiency can reach 99%. If the second stage uses wet dust removal, such as venturi tube, foam tower, spray tower, etc., when the washing liquid reaches a certain concentration, it can be sent back to the spray drying tower for spraying, or recrystallized, filtered, and dried , In this way, there is no liquid pollution problem.
Gas pollution sometimes emits odorous gas. At this time, wet dust removal can be used in the second stage to scrub (absorb) the odor of gas. Or adopt a semi-closed cycle method, burning 15% of the total exhaust gas and then emitting, and the remaining 85% is recycled in the system, which can reduce the amount of exhaust gas treatment.
Noise pollution in the double cone rotary vacuum dryer, such as spray drying with a rotary atomizer, the noise generated by the friction between the high-speed rotating atomizer and the air is very large, which may exceed 95dB. Therefore, when installing the mist When the carburetor is installed, a sound insulation device should be added. For large-scale installations, the noise of blowers and induced draft fans cannot be ignored. Sound insulation rooms should be installed and fans should be installed to reduce environmental noise.
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