Air pollution in industrial enterprises

Airborne pumps

basic principle of ventilation

Centrifugal exhaust veshilyatory

Determination of air exchange

dust control

Exhaust System

Forced ventilation on confectionery

Hourly values

mist of water vapor

pressure loss in the flare emissions

radioactive dust

scheme of the central pressure inlet system

Special prechamber

temperature gradient

Ventilation at bakeries

Ventilation in the Confectionery Factory

ventilation when dealing with heat

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Cleaning exhaust air from the dust

Extractors remove the sometimes very large amounts of dust. In large enterprises the amount of dust removed by aspiration, measured in tons per hour. Throw dust out is impossible because it would polluted air basin near the industrial site.

Sanitary standards (A 1215 - 03 as follows regulate the need for air purification from dust.

The degree of purification emissions containing dust, determined according to the maximum permissible concentration of dust in the working area of industrial premises: Emissions are removed by the atmosphere and containing dust in an amount not exceeding the above allowable limit, is not permitted to be cleaned.

Selecting a device for cleaning exhaust air from the dust should be carried out depending on the initial pylesoderzhaniya, dispersion of dust and the allowable dust emissions into the atmosphere.

The content of dust in the air, removed aspiration systems are very different. It depends on the properties of dust, perfect cover, humidity of the material, the presence or absence gidroobespylivaniya. Amount of dust in the exhaust air usually varies between 500 and 20 000zhg/zh3 (sometimes even goes up to 30 000 mg/m3). Dust content rarely falls below-mentioned limit, which should be guided as a minimum, conducting settlements on dedusting.

Here are some details on the contents of dust in the air (mg/m3), exhausted from the equipment (according to MIOT and other sources):

from knockout cast and arrays of the bunkers. . .............. 1000-2500
from the casing elevator in the casting .... 1000
However, the crushing plant .... 8000
from shelters peresypok ......... 2000-4000
crushing and grinding equipment
in the dry process .......... 20 000
from the rolling mills .......... 2500-3000
blast drum ........ 2000
cleaning drum .......... 4000-7000
Continuum shelter belt conveyors .................. 1000-2000
of runners ............... 1000-2000
reel ball and tube mills .................. 15 000
from the casing-cover ball mill .500-800
sandblasting large chambers .... 4000-8000
However, small .............. 25 000
agitators, augers, hoppers ..... 500-1000
Rough, grinding and polishing laps ........... 500-800
from Belleville nutritious ........ 2000-3000
from tables obrubschikov in foundries. . . 1000
blastrooms ......... 2000-3000
after pneumatic products - trap ................. 10 000
with suction holes and slotted
suction devices ............... 200-400

These figures refer to dry material in the absence of gidroobespylivaniya. With wet materials and the presence of pnevmogidroobespylivaniya dust content in the exhaust air is reduced (according to some authors 10 - 15 times). The absence of audited information about the content of dust in the air is evacuated from gidroobespylnvanii can not give specific figures.