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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Remove hazards from the vicinity of the upper thermal jets

Removal of harmful substances from the vicinity of the upper thermal jets or otherwise, it would seem, can reduce the need for air calculated by the allowable concentration in the working area. For ventilation on a "bottom - up," the concentration of harmful substances in the upper zone (ie, exhaust air) above, sometimes 1,5 times than in the work. If the formula (30) instead of / gdop substitute unhealthy concentration in the exhaust air kYR, then the value of L to get less. Some experts suggest that the air that way.

Since I can not agree. Firstly, we do not have sufficient data on the concentrations of gases in the upper zone at permissible concentrations in the working area. Second, the return of the jet from the upper zone of the working may create in the final against the increased allowable

concentration. Third, improving the air quality of working area due to ash hazards to the upper layers of air can hardly compensate for uneven allocation of pollutant over time, not to mention high concentrations in areas of greatest highlight hazards.

The following are recommended values of the non-uniformity:

a) under the natural removal of harmful substances from the working area due to thermal jets, small specific weight, etc.:

for low-toxic hazards or hazards that do not cause severe consequences in the short-term increase in the concentration (carbon monoxide), regardless of the uneven allocation

r = 1,2: 1,3;

for the toxic pollutant (malovrednye gases, vapors, aerosols) with a relatively uniform allocation of time

? 1,3: 1,4;

the same, but the uneven allocation of

a = 1,4 -=- 1,6;

b) the absence of the natural removal of harmful substances from the working area: for low-toxic hazards or hazards that do not cause severe consequences in the short-term increase in concentrations, regardless of the uneven allocation

? = 1,3 -: - 1,5;

to toxic hazards at a relatively uniform allocation of time

? = 1,5: 1,7;

the same, but the uneven allocation of = 1.7 H-2;

c) at the zonal ventilation with exhaust air from areas of possible allocation of hazards:

for low-toxic pollutant PLI for hazards that do not cause severe consequences in the short-term increase in concentrations, regardless of the uneven allocation

r = 1,1 -1,2;

to toxic hazards at a relatively uniform allocation of time

? 1,2: 1,3;

the same, but the uneven allocation of

> 1,3: 1,4.

The data for the particular hazardous substances not listed because they have general exchange and zonal ventilation is not acceptable.