SU1414732A1 - Elbow of pipeline for pneumatic conveying of powder material - Google Patents

Abstract

The invention relates to pipeline transport, namely to a pipe elbow for pneumatic conveying of powdered material. The purpose of the invention is to increase the life of the knee. The bend of the pipeline for the pneumatic conveying of powdered material contains a curved pipe 1 that is bent along the radius R and connected to the inlet 2 and outlet 3 of the straight-line pipes. The flow section of the curved pipe 1 in the area adjacent to the outlet pipe 3, and the flow section of the latter are formed by semicircles with a radius r equal to the internal radius of the pipeline along straight lines. The curved pipe I in the area bounded along the axial line from the end of the inlet pipe 2 by the arc of a circle defined as arccosi - is made with a flow section formed by two m semicircles with a radius r adjacent two concentric arcs whose center is in the plane the curvature of the knee from the side opposite to the longitudinal axis of the knee from the center of its curvature, the radius R of the smaller concentric arc and the distance i between the centers of the semicircles are determined respectively from the following expressions; Nd (0.5-4) g and | (1-4) g. 8 il. 2g with cl

Description

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 The invention relates to pipeline-MV transport, namely to a pipe bend for pneumatic transport of powder material.

 The purpose of the invention is to increase the life of the knee.

I FIG. 1 shows a pipeline bend, general view; in fig. 2 - section A (-A in Fig. 1; in Fig. 3 - section B-B in Fig. 1 (static); in Fig. 4 - B-B in Fig. 1; in Fig. 5 - cross section - n | ae D-D in Fig. 1; in Fig. 6 - view And in Fig. 1; in Fig. 7 - view E in Fig. 1; in Fig. 8 - section BB In Fig. 1, in working condition of the piping system.

it makes the magnitude of the forces F7, the uniform distribution of the powder over the cross section of the knee, and the resistance of the knee. Radius cd determines the magnitude of the FT forces and the knee resistance. 5The ratio of 1 / g is in the range

1-4 and depends on the concentration of the powder in the carrier gas, which determines the height of the powder layer during centrifugal separation of the powder-gas stream 10 in the knee.

The ratio is in the range of 0.5-4.

At a ratio of less than 0.5, the specific surface area of the high h segment increases significantly, which causes a rapid bend of the pipeline for the pneumatic transfer of the segment and the termination of the effective material powder content of the RP. At Fl / Fj, curvilinear nozzle 1 curved along the radius R, connected to the inlet 2

thirty

and outlet 3 straight pipes (Fig. 1). The inlet 2 has a 20 g cross-section (Fig. 2). The curvilinear ijfbm pipe 1 has a flow section | ra section adjacent to the inlet 1; 1 tube and bounded by an arc of a circle (b defined as arccos; - (Fig. 3), and in the section adjacent to the output plate 25 flow section shown in Fig. 4.

; The outlet 3 also has a flow area on (Fig. 5).

When a powdered material moves in a flow of a carrier along curvilines: centrifugal forces Fl of this knee arise tangential forces Fl whose components F7 counteract: similar forces FJ promoting concentration of the abrasive effect on the convex wall in the plane of curvature to - Lena. Under the action of FI forces, the powder is more evenly distributed in the cross section on the inner surface of the convex wall, which makes the wear more uniform and increases the durability of the knee. 40

The magnitude of the radius r determines the magnitude of the tangential components F2 of the centrifugal forces acting on the powder particles in the curvilinear pipe 1 and causing abrasion of the knee. The distance 1 between the centers of the semicircles determines the height of the segment of the arc of radius R, the area of the cross section of the knee and, consequently, its aerodynamic resistance, as well as the area of the torch-like powder against the inner surface of the knee. The height of the segment h is definitely small, and the effect of leveling the layer of powders also becomes non-significant.

The radius of semicircles, conjugated with concentric arcs, is equal to the radius of the pipe assembly, since the latter is equal to the radius of the circle inscribed in the cross section of the inlet section, i.e. inscribed with concentric arcs.

Claims (1)

Invention Formula The bend of the pipeline for pneumatic conveying of powdered material containing a straight inlet and outlet nozzle and a curvilinear connection bent along the radius R, the flow area of which in the area adjacent to the output nozzle and the flow section of the latter are formed by a matched semicircle with a radius r equal to the internal radius of the pipeline, characterized in that, in order to increase the service life, the curvilinear pipe in the section bounded along the center line from The inlet nozzle is formed by an arc of a circle defined as an arccos with a flow section formed by two semicircles with radius r, conjugated by two concentric arcs, the center of which is located in the plane of the knee from the opposite to the longitudinal side of its center of curvature of the axis of the knee, with By this, the radius RJ of a smaller concentric arc and the distance 1 between the centers of the semicircles are determined respectively from the following expressions: R (0.5-4) g and 1 (1-4) g. 147322 it makes the magnitude of the forces F7, the uniform distribution of the powder over the cross section of the knee, and the resistance of the knee. Radius cd determines the magnitude of the FT forces and the knee resistance. 5The ratio of 1 / g is in the range 1-4 and depends on the concentration of the powder in the carrier gas, which determines the height of the powder layer during centrifugal separation of the powder-gas stream 10 in the knee. The ratio is in the range of 0.5-4. With a ratio of less than 0.5, the specific surface area of the high h segment significantly increases, which causes rapid segment ejection and the termination of the RP forces. At Fl / Fj, the primitive withdrawal of the segment and the termination of the action of the RP forces. With Fl / Fj 0 5 0 - the mode is small and the leveling effect of the layer of powders also becomes non-significant. The radius of semicircles, conjugated with concentric arcs, is equal to the radius of the pipe assembly, since the latter is equal to the radius of the circle inscribed in the cross section of the inlet section, i.e. inscribed with concentric arcs. Invention Formula The bend of the pipeline for pneumatic conveying of powdered material containing a straight inlet and outlet nozzle and a curvilinear connection bent along the radius R, the flow area of which in the area adjacent to the output nozzle and the flow section of the latter are formed by a matched semicircle with a radius r equal to the internal radius of the pipeline, characterized in that, in order to increase the service life, the curvilinear pipe in the section bounded along the center line from The inlet nozzle is formed by an arc of a circle defined as an arccos with a flow section formed by two semicircles with radius r, conjugated by two concentric arcs, the center of which is located in the plane of the knee from the opposite to the longitudinal side of its center of curvature of the axis of the knee, with By this, the radius RJ of a smaller concentric arc and the distance 1 between the centers of the semicircles are determined respectively from the following expressions: R (0.5-4) g and 1 (1-4) g. / U- / U e X „m“ m,  Type D F. Phases. five view E Fig.b  R .i.v -mv:; v .... - f - - - f-i   pT-: - -: l-: - - . "H I rU city (