CZ20031190A3 - Device for distributing mass of air within a transient part having great cross section in a short section of a pipeline - Google Patents

Abstract

A device for splitting air mass in a large transition piece by changing the cross section on the short section of the pipeline route it consists of the transition part (2) with a shaped partition wall (5) of Perforated sheet in the shape of truncated cone; or quadrilateral pyramid with only a smaller base, located at the entrance to the transition piece (2) is larger an open base to the supply line (1), while being the side surfaces (6) form an angle α < 180 ° with the central part (7). On the end of the transition piece (2) is located equal to the distributor wall (4) also made of perforated sheet. Before Shape the distribution wall (5) may be directly in the inlet part a rectifying element (13) is located in the intermediate part (2) in the form of a circular or quadrilateral collar or in the form rectifier vanes. Into the interior (8) before the shaped distribution wall (5) can be incorporated a distribution grid (14) formed by a set of vertical plates. To the space (9) between the partition walls (5) and (4) may be a further shaped partition wall, equal to the partition wall or other rectifying elements

Description

Device for air distribution in transition part with large cross-section change on short section of pipeline route.

Technical field

BACKGROUND OF THE INVENTION The invention relates to a device for distributing air in a transition section with a large cross-sectional change over a short section of a duct. In particular, it relates to the installations in the transition parts for the sharp distribution of gases and dust in the devices following these transition parts, for example in electrostatic precipitators.

BACKGROUND OF THE INVENTION

Up to now, the transition portions, which have a large cross-sectional increase in the short section of the pipeline and which are most often used for the inlets of the various separators, are usually equipped with three vertical dividing walls, perpendicular to the longitudinal axis of the connecting device. The first two dividing walls and the center of the third dividing wall in the direction of gas flow are formed with the same free surface, while the circumference of the third dividing wall is formed with a smaller free surface. However, the use of such a transition element results in an inadequate velocity distribution of gases and dust along the entire cross-section of the subsequent device, thereby reducing the degree of its utilization. Insufficient use of the entire cross-section has a negative effect on the operation of this downstream device, for example an electrostatic precipitator. The pressure loss of the equipment increases and its efficiency decreases due to the flow of more gases and dust through the center of the cross-section and the underutilization of its outermost regions.

SUMMARY OF THE INVENTION

The aforementioned drawbacks of the prior art are largely overcome by a device for distributing air in the transition section with a large cross-sectional change over a short section of the duct according to the invention, which is characterized by the fact that the first perforated sheet manifold wall located in the transition section is

-2 ························· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · if the supply line has a circular cross-section, or in the form of a frustum-shaped pyramid with an upper smaller base in case the supply line has a quadrangular cross-section. In both cases, the distribution wall, with its larger open base, faces the supply line so that it forms a broken wall in each section. Perforated sheet metal with a different open area of the openings than in the part of the vertical base may be used on the sides of the partition wall thus formed, thereby achieving better directing of gases and dust to the walls of the transition piece. The side portions of the partition wall according to the invention are also better adapted to the velocities of gas and dust flow vectors, which increases its efficiency. To further uniformize the velocity profile downstream of the transition member, it is possible to complement the shaped distribution wall with a second distribution wall that is perpendicular to the longitudinal axis of the adjoining device and is located in front of the end of the transition member. This second (straight) partition wall is also made of perforated sheet metal. If a very uniform flow downstream of the transition piece is required, it is also possible to add more dividing walls or dividing elements beyond the shaped dividing wall.

In a preferred embodiment of the invention, the intermediate piece device may be supplemented by a further deflector element located at the inlet of the intermediate piece in front of the manifold and formed in the form of a circular or quadrilateral collar depending on the shape of the feed line. This baffle element is located narrower to the supply line space and expanding side to the transition space and directs a portion of the supplied gases and dust directly to the walls of the transition, thereby reducing the load on the central part of the partition wall. At the same time, lower pressure regions are created behind this element, into which a part of the gases and dust from the incoming stream is drawn, thereby increasing the distribution effect of the shaped partition wall.

In a further preferred embodiment, especially in the case of a narrower and at the same time high device behind the transition piece, the shaped distribution wall can be combined with a vertical distribution grid. This vertical distribution grid for distributing the gas stream in the horizontal direction is built into the space in front of the shaped manifold wall, which in this case is shaped only at the top and bottom and at the sides extends straight up to the walls of the adapter.

• ·· ·

-3Overview of figures in drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in greater detail in the drawings, in which: FIG. 1 is a longitudinal cross-sectional view of a transition panel with a shaped partition wall and a straight partition wall; FIG. Fig. 4 is a longitudinal cross-sectional view of the same transition portion supplemented by an arc-shaped rectifying element; Fig. 4 is a cross-sectional view of the transition portion along line B-B of Fig. 3; Fig. 6 is a cross-sectional view of the transition portion along line C-C of Fig. 5, and Fig. 7 is a detail of a manifold wall showing an angle α enclosing the lateral and central portions of the manifold. partition walls.

DETAILED DESCRIPTION OF THE INVENTION

The air distribution device in the transition section with a large cross-sectional change over a short section of the duct is, according to FIG. 1, in longitudinal section and FIG. 2 in plan view, formed by a transition section 2 connected by its inlet to the inlet duct and its outlet to the device 3, e.g. for electrostatic dust separator. In the transition piece 2, a perforated sheet-shaped shaped distribution wall 5 is provided which has the shape of a frusto-conical casing with only a smaller base or a frustum-shaped pyramid with a smaller base depending on whether the supply line 1 has a circular or quadrangular cross section. The shaped distribution wall 5, with its larger open base, faces the inlet duct 1, so as to form an angled distribution wall in each section. Downstream of the shaped distribution wall 5 downstream of the gas flow, there is a straight distribution wall 4, also made of perforated sheet metal, at the end of the transition piece 2.

FIGS. 3 and 4 show a longitudinal and plan view of a similar transition piece 2, the internal configuration of which is complemented by a deflection element 13 formed in the form of a circular or quadrilateral collar with arcuate side surfaces. The deflector element 13 is located in the transition piece 2 in front of the manifold wall 5 with a narrower neck to the supply line 1 and an expanding neck to the space 11 behind the transition piece 2.

-4 ·· · 445

4 4

4 4

4 4 4 • 44

A further preferred embodiment of the invention is shown in FIGS. 5 and 6, wherein the internal configuration of the transition piece 2 is supplemented by a distribution grid 14 formed by a system of vertical sheets and built into the space 8 in front of the manifold 5. The manifold 5 is kinked in this case. only at the top and bottom of the sides continues straight up to the walls of the transition piece 2.

By the above-described device and its arrangement in the transition section with a large cross-sectional change over a short section of the pipeline, a uniform distribution of gas and dust velocity field behind the transition section is achieved, thereby increasing efficiency and efficiency of operation behind the transition section of connected devices, especially electrostatic precipitators and other similar equipment.

Claims (5)

PATENTOVÉ Claims Apparatus for distributing air in a large cross-sectional transition section over a short section of a duct, comprising a transition section with internally distributed dividing walls and elements, characterized in that a proximal portion of the transition section (2) is shaped. a frustoconical or quadrilateral pyramid-shaped perforated sheet wall (5) with only a smaller base, with its larger open base facing the supply pipe (1), its side surfaces (6) forming an angle of rotation with the central part (7) Z 180 ° and downstream of the shaped distribution wall (5) downstream of the gas flow direction, a straight distribution wall (4), also made of perforated sheet metal, is located at the end of the transition piece (2). Apparatus according to claim 1, characterized in that a rectifying element (13) in the shape of a round or quadrilateral collar with straight lines is located at the entrance to the transition part (2) in the transition part (2) in front of the shaped partition wall (5). cranked or arcuate side faces, oriented narrower to the inlet pipe (1); and. with an expanding neck to the space (11) behind the transition piece (2). Device according to claim 2, characterized in that the deflecting element (13) is in the form of one or more vanes with a straight, bent or arcuate cross-section. Device according to claim 1-3, characterized in that the internal arrangement of the transition piece (2) is complemented by a distribution grid (14) formed by a system of vertical sheets and built into the space in front of the manifold (5), the manifold (5) is angled only at the top and bottom and extends directly to the sides of the transition piece (2) on the sides. Device according to claim 1 - 4, characterized in that the internal arrangement of the transition piece (2) is complemented by a further partition wall in the form or straight or by other rectifying elements (straight, angled or arcuate) located in the space (2). Between the partition walls (5) and