Experimental Study On The Separation Performance Of Spherical Cyclone

In order to solve the problem of low separation efficiency and high energy consumption for fine particles in traditional column cone cyclone separator,a new type of spherical column cyclone separator was proposed in this paper.In order to reduce energy loss and improve the efficiency of dust removal,the separation characteristics of the cyclone separator are studied by combining theoretical analysis,numerical simulation and test.Starting with the analysis of the force analysis of the particles,the movement of the particles in the spherical cyclone separator is analyzed.It is found that the velocity of the particles in the radial direction is reduced and the residence time is increased.The velocity of the axial direction increases and the pitch increases,which increases the probability of the particles entering the dust outlet.At the same time,the free vortex region is larger in the lower sphere,reducing the tail of the air flow.The particle back mixing caused by swing is helpful to improve the separation efficiency.Secondly,the numerical simulation of the column cone cyclone and the spherical column cyclone separator is carried out by using software Fluent.The results show that the static pressure of the spherical column cyclone separator is smaller than that of the column cone cyclone cyclone separator,which is helpful to reduce the energy loss.The decrease of velocity and the increase of residence time are beneficial to the separation of particles.For the spherical column cyclone separator,with the increase of inlet velocity,the static pressure and velocity increase,the moving process of particles becomes shorter and the residence time decreases,and the static pressure and tangential velocity decrease with the increase of column height.The particle trajectory becomes longer,but the pitch decreases in the axial direction,and with the increase of the diameter of the exhaust pipe,the static pressure and tangential velocity increase first and then decrease.The axial velocity shows that the phenomenon of back flow and stagflation becomes serious.In addition,the motion trajectory of particles is different even if they enter at the same position.The small particles are easy to follow the airflow from the exhaust pipe,and the large particles are more likely to be arrested because of their larger volume and gravityFinally,the separation performance of the spherical column cyclone separator is tested.The results show that:under the same working condition,compared with the column cone cyclone separator,The pressure drop of the spherical cyclone separator was reduced by 505Pa,the decrease was 38.25%,while the total separation efficiency increased by 3.47%.The separation efficiency of particles with diameter less than 1 ?m was increased by 1.14 percentage points,and the separation efficiency of fine particles was improved,which indicated that the separation efficiency of spherical column cyclone separator was better.With the increase of inlet velocity,the separation efficiency and pressure drop increase,the separation efficiency and pressure drop decrease with the increase of column height,and the separation efficiency and pressure drop decrease with the increase of exhaust pipe diameter.The relationship between pressure drop and inlet velocity and exhaust pipe diameter is fitted respectively.The experimental results are in good agreement with the numerical simulation.By studying the internal flow field and particle movement of the spherical column cyclone separator,the mechanism of solid particle separation is revealed,which has important guiding significance and engineering application value for the development of high efficiency and energy saving dust removal equipment.