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


Hourly values

In ventilation technology always operate with the hourly mean values. To this we can also resort to calculate flare emissions, taking into account the maximum speed is not "ripple" of wind, and some average. For most areas the maximum speed "pulsing" the wind can be assumed to be 5 m / sec. Consequently, the average settlement rate is equal to 2,5 m / sec. Such speed and are recommended in the calculation of air emissions plume.

Height of lifting hazards of the mouth nozzle is not purely geometrical quantity. This value is conditional, which takes into account not only the actual elevation of the jet (or more precisely the part that contains the greatest number of hazards), but by a significant reduction in pollutant concentration in the jet due to its erosion. Consequently, given the total number of hazards, an action taken outside this exhaust (g / h), it is logical to assume the value of height, higher than its actual geometric quantities.

And finally, this last point that should be taken into account when calculating the jet ejection. Experiments show that the highest concentration of harmful substances in the fuzzy jet is not on its axis, and just there where the most stable currents, ie,. PACE surface by the incoming flow. Hence, if we talk about often blurred scab, which is approaching the horizontal position, the highest concentration of harmful substances is on the upper boundary of the plume. A is, in turn, increases the value, as even in purely geometric height is not up to the jet axis (as some researchers), and to its upper limits.

Given the above, based on the treatment of the available experimental material the author suggests the following formula to determine the heights of pollutant emission in the flare (estimated wind speed 2.5 m / sec):

In a strong wind having velocity of 10-15 m / sec, the torch itself is not formed and can not speak about any appreciable rise over the mouth of the jet nozzle. For when this wind jet is so blurred that the concentration of harmful substances are reduced by hundreds of times. Thus, the flare emission is effective and in windy conditions.