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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suction ducts exhaust systems

Suction ducts exhaust systems are usually grouped in several pieces and displayed in the upper technical floor, where they are connected to the exhaust fan coming through the floor ducts easily decorated, especially if they are near the step and partitions. Plaster channels are not recommended because they are only used for the extraction of the auxiliary facilities - restrooms, closets, etc.

In systems with clean air from dust, aerosols and gas cleaning devices - filters, bubblers, etc. - are set close to the equipment they serve. Thus, through the overlying floors are just as ducts, conveying clean air. Upper technical floor or part thereof, designed to accommodate the exhaust installations performed with enhanced soundproofing and massive overlap. Especially when you want to fully repay the vibration from the fans, are arranged so-called "floating" floor, where concrete slabs are not connected firmly with the building designs, and lie on an elastic foundation. Sometimes these overlap replace heavy slabs simply supported on a cush n lying on the floor slabs of the ordinary.

When the vibration is not allowed, exhaust installations are located on the ground in the basement of the building. When placing the exhaust systems in the basement of the exhaust pipes were forced to appear above the top of the facade of the building. In this case, the pipe starts at the ground, lie groups, and relatively easily decorated.

Exhaust systems placed in the technical floor, installed in isolated areas with appropriate zvukozaglusheniem. These machine rooms should be bright, reasonably spacious and specially ventilated in the presence of toxic pollutant (air exchange of 3 to 5). There shall be piped to the drain condensation and precipitation of the fan casing. Exhausts are held flare, with the conclusion of the mouth of the pipe to a height of not less than 2-3 m above the ridge of the roof. Exhaust pipes are produced through the roof as possible without death, they are placed in pairs and symmetrically. This location is convenient for fixing pipes to the roof and it is desirable from the standpoint of aesthetics.

Supply plant to stir in the basement, if any, has a height of not less than 3,5 m, or in the ground floor. Premises inlet chambers should have a good sound insulation. Fan installation mounted na foundations that are unrelated to building structures. Installation of foundations in the pits. Air intake may be through the window openings PLI through openings in the walls of the special booths.

Supply plant serving the building under consideration is usually carried out with air filtration. Sometimes added, and flushing, especially if you want full or partial air-conditioning.

An indispensable element of supply plant is a muffler, removed the aerodynamic noise. Can be used silencers of any type: chamber, plate, cellular, etc. As a main muffler inlet risers performed by non-metallic and covered the inside sound-absorbing plaster.

Not recommended for the main air supply risers of metal. This may be allowed only in exceptional cases, where the air ducts should be constructed of steel no less than 1 mm (better than 2 3 mm) with stiffeners. Air velocity in the riser is not. exceed 6-7 m / sec. Malozhestkie metal ducts with significant rates of air vibrate and create a very unpleasant noise.