RESEARCH OF TRANSPORTATION OF FINELY DIVIDED MATERIAL TO THE COPPER AIR DUCT

Results of pneumotransportation of finely divided material to a copper air duct by means of the developed batcher

STUDY OF TRANSPORTATION OF A FINE DISPERSED MATERIAL TO THE COPPER AIR DUCT

Results of pneumotransportation of fine dispersed material to a copper air duct by means of the developed batcher

Influence of elements thickness of separation devices on the finely dispersed particles collection efficiency

This article presents a rectangular separator, developed by the authors, for purification of a multiphase gas flow from the finely dispersed particles with a diameter of up to 10 µm. In order to increase the separation process efficiency, a research was conducted to determine the optimum thickness of I-beam elements within the separator at different values of the flow inlet rate and length of I-beam elements. It was found that change in the wall thickness of elements leads to a change in the flow structure, which causes a decrease in the dust particles collection efficiency

Collecting of finely dispersed particles by means of a separator with the arc-shaped elements

This paper includes the description of a separator, developed by the authors for the gas flow purification from the finely dispersed particles. The authors also studied the influence of the separator dimensions and the dusty gas flow rate on the degree of its purification from the finely dispersed particles, as well as on the change in the hydraulic resistance of this apparatus. This paper also shows that the main forces that make the greatest contribution to the purification of the gas flow from the finely dispersed particles are centrifugal and inertial. Moreover, the dependencies of the purification efficiency on the Stokes numbers are shown in this paper. The authors studied the change in the hydraulic resistance coefficient of this apparatus from the Reynolds numbers as well

Сleaning of gas emissions of boiler installations of solids

High performance cleaning of a gas stream of solids of small diameter at small pressure losses in the device is one of key indicators at the choice of the abstersive device. In article, the rectangular separator developed by authors for efficient cleaning of gas emissions of boiler installations of solids is offered. The comparative analysis of a separator with the cyclone СN-11-400 is made. The dependence of hydraulic resistance coefficient from dimensionless geometric factor, it determined the global minimum and the ratio of beam separation elements, which are achieved with minimal energy costs. Results on the efficiency of the proposed separation device are obtained for different values of the length of I-beam elements. In particular, it is shown that with a decrease in the length of I-beam elements, the efficiency of separation of small-diameter particles increases. As a result of the numerical experiment, it was determined that when the length of I-beam elements is equal to 13 mm, the highest efficiency is achieved. At a volume flow rate of Q = 0.444 m3/s, the efficiency of the separator is on average 52% higher than that of the cyclone CN-11-400 when separating gas from particles up to 8 microns in diameter

Classification of bulk material from the gas flow in a device with coaxially arranged pipes

The paper deals with the problem of classification of bulk material, based on silica gel, larger than 30 µm, from dusty gas flow. In order to solve this problem, the design of a classifier with coaxially arranged pipes is proposed. According to the conducted studies, it is more efficient to use a classifier with an inner conical pipe to solve the problems of separating the particles from the gas flows of various sizes, since a greater value is achieved for the centrifugal, inertial, gravitational and other forces acting on the dusty flow, that contribute to knocking the particles out of its structure, than in a classifier with a cylindrical inner pipe. On average, the efficiency of a classifier with a conical inner pipe is by 35.3% higher than that of a classifier with a cylindrical inner pipe. Classification of particles of bulk material, based on silica gel, larger than 30 µm from the dusty gas flows is solved most effectively by using a classifier with a conical inner pipe and hd parameter of 50 mm and a classifier with a cylindrical inner pipe and hd parameter of –10 mm

Modeling of Erosion in a Cyclone and a Novel Separator with Arc-Shaped Elements

Modeling of the separation of catalyst particles from gas using two devices, a cyclone and a novel separator with arc-shaped elements, was performed for fluidized-bed dehydrogenation of C4–C5 paraffins to isoolefins as an example. The proposed dust collector allows one to reduce erosive wear by several times (~6.5-fold) in identical regimes and at identical parameters of the process. The effect of particle size on erosive wear was analyzed under near-industrial conditions; the regions most susceptible to wear in the analyzed devices were identified, as well as the functions describing the dependence between the erosive wear rate and particle diameter for the cyclone and separator with arc-shaped elements, making it possible to predict wear in the devices were obtained

Separation of Fine Particles from Gas in Paint-Spraying Booths

Nowadays, at production facilities with paint-spraying booths that use paint and varnish materials to cover the surfaces of product, the problem of gas flow contamination with finely dispersed solid particles of dust and rubbish, which negatively affect the quality of products, is increasingly being raised. In order to minimize the content of solid particles in the gas flow, coarse and fine filters are installed in the paint-spraying booths, which prevent dust particles from entering the surface of products. However, the existing purification devices have a number of disadvantages that affect the efficiency of collecting finely dispersed particles from the gas flow with a size of 0.5-5 microns. The authors of article developed a square separator to increase the efficiency of collecting finely dispersed particles from gas flows in the paint-spraying booths. The installation of proposed separation device in the paint-spraying booths affects not only the quality of collecting solid particles, but also increases the service life of fine and coarse filters In the course of numerical studies, the results of impact of structural and technological parameters, namely, the impact of inlet rate and scale of separation device on the efficiency of collecting solid particles from the gas flow, were obtained

The gas flow dynamics in a separator with coaxially arranged pipes

In order to increase the efficiency of gas purification from the particles of up to 20 microns and to increase the service life of bag and electrostatic filters, the authors propose to use a centrifugal separation device with coaxially arranged pipes to be installed before the fine purification devices. The numerical studies of gas dynamics in a separation device were conducted in ANSYS Fluent software package. As a result of conducted numerical studies, it was found that the pressure loss in the centrifugal separation device is not more than 70 Pa at the inlet gas flow rate from 1 to 15 m/s and the width of rectangular hole within the range from 10 to 15 mm. The low pressure losses are caused by the design features; in particular, the resulting vortices in the inter-cylindrical space practically do not contact the wall surfaces of device. The equations of pressure loss depending on the width of rectangular holes and the hydraulic resistance coefficient of separation device depending on the inlet gas flow rate were obtained. The design coefficient of hydraulic resistance of separation device was equal to 0.45