pressure loss in the flare emissions
Pressure loss at the flare emission is composed of dynamic pressure at the outlet from the pressure loss in kopfuzore. The latter, referred to the output rate of ~ o0, does not exceed 15% of the dynamic pressure. The total drag coefficient of flare emission.
Besides the basic benefits - removal of harmful substances into the higher layers of the atmosphere, flare emission also has other positive effects. It is compact giving the benefit of the absence of a bulky umbrella and can be removed to a great height above the roof (thanks to lower weight and smaller "sail").
Applying the flare emission may show attachment to the mouth of a large (the limit), the height above the roof - up to 20 m. The pipe such heights due to absence of windage, and relatively light weight is easily installed on a reinforced concrete roof and attached two sets of extensions.
Application of jet ejection is possible not only in industrial ventilation, but ventilation and non-industrial buildings. In other words, it is advisable at all to abandon umbrellas over the exhaust shafts.
Note that for flare release device required for removal of moisture from the fan housing.
Determine the heights of the mouth of unhealthy attachment with sufficient accuracy is possible only when there is no wind. Theoretical method for calculating the wind, based on the laws of the expiration of a submerged crust of a round nozzle was proposed by the author in 1957 for this case calculation formula in accordance with the scheme shown in Fig. 14, has the form:
In the presence of wind phenomenon is extremely complicated, and the effect of flare emission is much worse. Wind hinders the rise of the jet. On the other hand, the wind, eroding the output nozzle, to a large extent dilutes and carries hazards of their place of isolation, which prevents pollution of the surface layers of the atmosphere of industrial site.
Issues of the scattering gas pollutant in the atmosphere, and passing and issues in elevation of the gas jet over the mouth of the pipe occupied many researchers in the late 40's and early 50's. The most serious need to consider the work of BV Shafranov, VD Krantsfelda, L. Glebova, and ES Taratuta dedicated to the study of air emissions in the production of viscose silk, which was published in the journal "Hygiene and sanitationВ», в„– 6 for 1949