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


Choice dust collector

When you select a dust collector in each particular case must take into account a number of circumstances, chief among them - dust properties and the required degree of cleaning plays an important role worth of dust and the need to return to production. Essentially the presence or absence of water and the possibility shlamoudaleniya. And finally, do not always care about size of dust collector and the cost of its operation.

With a lack of water for scrubbing and labored shlamootvode sometimes possible to filter the slurry and return the clarified water again on the wet cleaning. Keki gets wet or is used in the production or released to the dump. Ready to give advice on the choice of purification method and type of dust collector is difficult. Only speak of the fundamental blueprint.

If pylevydelyayuschy process proceeds in an unheated room, obviously, wet cleaning is eliminated. She is also eliminated in the presence of dust-setting, such as cement. Unsuitable for wet cleaning and dust, which reacts with water, such as aluminum. And finally, wet cleaning is not suitable for dry aching need to return to production.

On the other hand, dry cleaning is absolutely acceptable for a large dusty air humidity, eg in the presence of foci gidroobespylivaniya dusting. Dry cleaning is of little use for sticky dusts (eg, dust, fiberglass) and is ineffective for fine dust (with the exception of cloth filters). In addition, unloading and transportation of the dry scrubber dust - the operation extremely difficult.

For a fine treatment as a second or third stage is sometimes used filters that serve to clean the incoming air - oil, paper, fabric FPP. Listed as malopyleemki filters that can be used only for cleaning small - dusty air, with a residual pylesoderzhany 20-40 mg/m3. They are suitable as the last stage only after the dry dust collectors. When wet almost inevitable entrainment, negatively affecting the work of fine filters.

Of special filters, which filter material is fibrous tissue, which creates an electrostatic effect, consider a filter fabric FPP-15, the so-called filter "Lyke. The cell of this filter is shown in Fig. 29. Performance of the cell - from 2000 to 2500 m3 / h with resistance of 20-25 kg/m2. Weight cell 14 kg of fabric FPP-15 is about 22 m in a single layer.

Options and other design filter fabric FPP-15. Cells of these filters by the factory has not yet produced.

By using such filters are usually uchitozhayutsya n replaced by new ones. When radioactive dust cells to be buried.

Speaking about the effectiveness of various dust collectors, it should be noted that the references cited in the coefficients of purification are often overstated. This applies particularly to a dry cyclone. Virtually their effectiveness should not take more than 80-85% for the cyclone with a diameter up to 700 mm and 65-75% for the rest. Exceptions are cyclones with a reverse cone, whose effectiveness is somewhat higher.