APPLICATION OF WATER CURTAIN FOR RESTRICTION OF HAZARDOUS POLLUTANTS IN THE ATMOSPHERE

In order to limit the emission of chemical, fire and explosive substances in the atmosphere water units, created by using of various engineering means (hose sprayers, spray guns, turbine and fan nozzles and so on), are used the most widely. According to the analysis of published data the greatest effect of their usage is due to the involvement of water jets of air with hazardous impurities with its subsequent mixing and dispersion. The study includes a simple mathematical model to calculate the velocity of air entrainment by rising water jets. We created a program in MathCAD environment by which the numerical simulation of air entrainment by rising water jets, formed from the spray hose, was performed. In addition, the study shows that despite the presence of the air entrainment effect in the spray jet, it can not significantly affect the limitation of the dangerous pollutants emission in the atmosphere to form small velocities. Also the study proposes the method of estimating the amount of stirring air by spraying water jets. Based on the obtained dependence, we carried out the comparative analysis of various means for mixing air with dangerous impurities. As a comparative test we introduced the efficiency ratio of water curtain (water usage ratio). Based on the obtained characteristics of the spray by mixing air atomized water jets, we proposed the method of calculating the required number of nozzles for making water curtain in the aftermath of emergencies caused by spillage of fire, explosion and hazardous chemical substances, we gave an example of the calculation.