| During the production process of the enterprise,operations such as crushing,coal loading,screening and unloading can easily generate floating dust with small particle size.Under the action of the airflow,the dust gradually spreads and spreads,which seriously pollutes the working environment of the workers.Workers who inhale dust for a long time are very susceptible to pneumoconiosis,and explosive dust can easily lead to dust explosion accidents.In order to effectively reduce the dust concentration in the production site and eliminate the harm of dust to workers’ health,life safety and working environment,a simple and easy-to-install liquid-medium ultrasonic nozzle dry mist purification device was developed with the help of the spray dust reduction experimental platform.Using the method of experimental research,the atomization characteristic parameters of six liquid-medium ultrasonic nozzles were measured.The results showed that the air flow of the six nozzles showed a trend of increasing with the increase of the air supply pressure,and the water flow showed a The variation law of continuous decrease with the increase of air supply pressure;with the increase of air supply pressure,the atomization angle of KTZCO30 and ST-47 nozzles gradually decreases,and the atomization angle of KTZCO60,ST-52 and no model nozzles decreases first and then increased;under different water supply pressures,the KTZCO80 nozzle atomization angle is inconsistent with the air supply pressure;except for KTZCO80 nozzle,the range of other nozzles and the air supply pressure show a positive correlation law,the greater the air supply pressure,the higher the range The larger the size of the droplets;the droplet sizes of the six nozzles all show a decreasing law with the increase of the air supply pressure.The rate and range of the droplet size reduction of different nozzles are not consistent,and the droplet size decreases gradually.In order to select the most suitable nozzle for the dry mist purification device,the atomization characteristic parameters of the six nozzles and the variation law of the nozzle droplet size along the axial direction were analyzed.With the increase of the spray axial distance,the variation range of the droplet size of ST-47 nozzle is the smallest and the change is gentle,and the increase of the axial distance has the smallest influence on the droplet size of ST-47 nozzle.ST-47 is preferred as the optimal nozzle for the ultrasonic dry mist purification device.The atomization characteristics and dust reduction performance of the optimal nozzles were studied,and the optimal working parameters of the dry mist purification device were determined.With the increase of air supply pressure,the peak value of droplet size of ST-47 nozzle moves to the left continuously,and the number of small size droplets gradually increases.Keeping the water supply pressure unchanged,after the air supply pressure reaches0.5 MPa,continuing to increase the air supply pressure has little effect on the droplet size of the nozzle.The droplet velocity of ST-47 nozzle increases along the distance of the spray axial direction and gradually decreases,and the droplet velocity at the nozzle outlet is the largest.With the increase of water supply pressure,the droplet velocity first decreased and then increased with a small change range,and changing the water supply pressure had little effect on the droplet velocity.With the fixed water supply pressure,with the increase of air supply pressure,the dust reduction efficiency of ST-47 nozzles for total dust and respiratory dust gradually increases,and the growth rate of respiratory dust dust reduction efficiency is greater than that of total dust reduction efficiency.The optimal working parameters of the dry mist purification device are determined as the water supply pressure of 0.1 MPa and the air supply pressure of 0.5 MPa.On this basis,a simple and easy-to-install dry mist purification device was designed,and the structural parameters of the dry mist purification device were optimized.The distance between the nozzle spray superposition area of ??the dry mist purification device and the spray outlet gradually increases with the increase of the nozzle installation distance,and after the nozzle spray reaches the direct shot section,the distance between the superposition area and the nozzle outlet increases suddenly.It is preferred that the optimal nozzle installation distance of the dry mist purification device is 30 cm,and the nozzles of the dry mist purification device have the same atomization effect and uniform spray.The droplet size of the dry mist purification device increases gradually with the increase of the distance of the spray,and the increase rate decreases continuously.The dry mist purification device is applied to the engineering site,and the engineering application results show that the dust reduction effect of the dry mist purification device is better. |
