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


heat dissipation bakery ovens

Heat of baking ovens are made up of heat from heated surfaces of heat, bursting with oven gases and heat cooling shapes and baked bread. Determine the heat calculation is very complicated, they are taken on the basis of experimental data. Table. 32 shows the total heat from the furnaces in the main hall (or in the bakery department, if it is isolated) and the firing unit. Belt-type furnace PHS set entirely in the main shop and do not require a fuel compartment.

The data presented in Table. 32, does not claim to be accurate. However, for practical purposes they are satisfactory. Furnace heat PHS are approximate, for lack of better data.

Heat from proofing cabinets are relatively small and can be accountability at a rate of 10% of heat release from the furnaces.

In determining the mechanisms of teplopostupleny believe that up to 40% of the installed capacity is converted into heat heat dissipation from the people of solar radiation and light are defined in the usual way. It should be borne in mind that in the main Mr. shop, as in many other areas, artificial lighting is functioning round the clock. Thus, teplopostupleniya from solar radiation and the illumination is powerful add up.

Allocation of water in the main shop is on the test, from the people and the bursting of the cabinets proofing and baking chambers of moist air. The latest source of moisture is most significant, for it is difficult to calculate.

Inside the main shop of heat is so prevalent (slope of more than 3000) that the moisture can not be ignored, and to calculate air only by excessive heat. Vlagovydelenie from the furnace does not affect the status of air pollution, since most of the captured local suction.

Local pumps near the stove, carried umbrellas, canopies or glazed veils. In furnace-type TTF-2 and UDPG are arranged mainly veil. From the front of the furnace curtain should defend at 1,5-2 m, the bottom it is situated at a height of 2,2 m from the floor. Bleeding is usually a natural by mines or vents.

The amount of air removed from beneath the veil, can be calculated from the rate in its horizontal section, which is accepted within 0,1-0,12 m / sec. In the horizontal section of the veil on one oven about 10 m2 exhaust air volume is 4000 m3 / h. In furnace-type CRF for removing gases from landing and unloading boxes set umbrellas, sun visors with the departure of at least 700 mm. The volume of air exhausted minimum 2,000 m3 / h for each umbrella.

In furnace-type PHS arranged umbrellas, visors for both fronts. The volume of extracted air not less than 2000-2500 m3 / h for each umbrella.

We import hearth furnaces with a grid of BN-25 is sucking gases and vapors from the prechamber in planting the front furnace. The volume of extracted air not less than 1200 m3 / h per furnace. Since the temperature of the extracted gas is quite high, it is necessary to dilute them by air suction from the room at about the same volume.

To improve the working conditions of bakery ovens recommended air dushirovanie jobs. The volume of air to one shower 2000-2500 m3 / h. Effective is the air dushirovanie in closets final proofing. The volume of air to one shower 1000-1500 m3 / h. Ventilation flue offices are usually calculated on the removal of excess heat. Gassing negligible air to the excess heat is sufficient to remove them. In combustion units permitted recycling air.