JPH06320055A - Centrifugal dust collector - Google Patents

Abstract

PURPOSE:To improve the separation efficiency of dust by giving curvature downward to the advancing direction of gas to the piping of a gas introducing part. CONSTITUTION:Curvature downward to the advancing direction of gas is given to an introducing line 2 of dust contg. gas. Thus, dust 5 contained in gas is given centrifugal force upward to the advancing direction of gas at a curved part of the introducing line 2 and flows in a separation vessel 1 from the lower part of a gas inflow port 6. Since when the dust flows in from the lower part of the inflow port 6, the flow rate of gas flowing in the axial direction is increased compared with the upper part, the dust 5 has a large axial velocity component and is transported to below an internal pipe 3 before it reaches the vicinity of the wall surface of the internal pipe 3. Since below the internal pipe 3, the turning velocity becomes highest, the dust 5 is given strong centrifugal force and hits the wall surface of a separation vessel 1. The hit dust 5 loses its velocity and falls along the wall surface and is recovered in a dust bunker 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal dust collector, and more particularly to a dust collector having high dust collection efficiency.

[0002]

2. Description of the Related Art Centrifugal force dust collectors that use centrifugal force to separate dust particles from dust-containing gas flow tangentially into the vertically standing cylindrical or conical separation container to rotate the dust-containing gas. Generate ingredients. The dust, which has a higher density than the gas, is carried toward the wall surface of the separation container by the centrifugal force generated by the swirling, and is separated from the gas flowing out from the center of the circle.

In the conventional dust collecting apparatus, for example, the Aerodyne CYCLONE EVALUA (1980.
As described on page 1-14 of TIONVOLUME A (1980, GENERAL ELECTRIC), connect a horizontal conduit to the gas inlet of the separation container, and use this horizontal conduit to collect dust-containing gas in the separation container. It has a structure that leads to.

[0004]

When the gas is introduced through a horizontal pipe line as in the conventional case, the dust in the gas is distributed almost uniformly in the cross section of the pipe line. Therefore, dust having a uniform concentration flows into the gas inlet of the separation container regardless of the cross-sectional position.

By the way, in the upper part of the gas inlet of the separation container, the radial velocity component is much larger than the vertical velocity component of the gas, and the inflowing dust is entrained in the gas flow in the radial direction and is separated. Move toward the center of. In the vicinity of the center of the separation container, since the swirling speed is slow, the centrifugal force acting on the dust is small, and the dust flows out from the gas outlet at the center.

Therefore, the conventional method has a problem that the dust entering from the upper part of the gas inlet is not separated and the separation efficiency is lowered.

[0007]

The above-mentioned problems can be solved by providing a pipe line connected to the gas inlet of the separation container with a downward curvature with respect to the traveling direction of the gas.

[0008]

By providing the pipe with a downward curvature with respect to the gas advancing direction, an outward centrifugal force acts on the dust in the pipe in the flow direction. Due to the action of this centrifugal force, the dust moves, so that the dust concentration in the upper part of the gas inlet is low and the concentration in the lower part is high. This increases the dust separation efficiency.

[0009]

EXAMPLE An example of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a centrifugal dust collector according to the present invention.

In FIG. 1, 1 is a dust separating container, 2
Is a gas introduction line for guiding the dust-containing gas to the separation container 1,
Reference numeral 3 is an inner tube for discharging the gas from which dust has been separated. Further, 4 is a dust bunker for collecting the separated dust, and 5b is the separated dust. Further, 6 is an inflow port for the dust-containing gas, which is provided offset from the central axis of the separation container 1 in the radial direction so that the inflowing gas swirls.

In the present invention, as shown in FIG. 1, the introduction line 2 for the dust-containing gas is provided with a downward curvature with respect to the traveling direction of the gas. Therefore, the dust 5 contained in the gas is subjected to an upward centrifugal force with respect to the traveling direction at the curved portion of the introduction conduit 2, and flows into the separation container 1 from the lower portion of the gas inlet 6 as shown in FIG. .

The inflowing gas swirls in the separation container 1, separates dust by the action of centrifugal force, and then flows out through the inner tube 3. The separated dust slides down the wall surface of the separation container 1 and is stored in the dust bunker 4.

[0014]

The effect of the present invention will be described with reference to FIG.

FIG. 2 is a diagram showing the behavior of dust flowing into the separation container in a two-dimensional axisymmetric section.

Since the dust that has flowed into the separation container 1 from the upper part of the inlet has almost no axial velocity component Vz, it is carried to the vicinity of the wall surface of the inner tube 2 by the radial velocity component Vr in a short time. In the vicinity of the wall surface of the inner tube 2, the turning speed is small due to the wall surface frictional resistance, and the centrifugal force acting on the dust becomes weak. Therefore, the dust is not separated from the gas and follows the locus shown by 7 and flows out to the outside.

On the other hand, when the gas flows in from the lower part of the inlet, the flow rate of the gas flowing in the axial direction is larger than that in the upper part, so that the axial velocity component Vz is large. Therefore, the dust is carried to the lower portion of the inner pipe 3 before reaching the vicinity of the wall surface of the inner pipe 3. In the lower part of the inner tube 3, since the swirling speed is the highest, the dust receives a strong centrifugal force and collides with the wall surface of the separation container 1. The dust that collides with the wall surface loses speed and falls along the wall surface and is collected.

For this reason, in the conventional method in which the dust enters at a uniform concentration in the inlet cross section, the dust entering from the upper part of the inlet cannot be separated from the gas. On the other hand, in the present invention, by providing a curvature to the gas introduction pipe and changing the trajectory of the dust downward, the dust concentration at the lower part of the inlet where the separation is easy is increased, and the upper part of the inlet where the separation is difficult is made. The concentration becomes low. Thereby, the separation efficiency of dust can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an explanatory view showing the effect of the present invention.

[Explanation of symbols]

1 ... Dust separation container, 2 ... Gas introduction line, 3 ... Inner pipe, 5
… Dust, 5b… separated dust, 6… gas inlet.

Claims (1)

[Claims] 1. In a dust collector for separating dust in a gas by giving a swirling motion to the dust-containing gas and centrifugal force acting on the dust, the pipe of the gas introducing part is provided with a downward curvature with respect to the traveling direction of the gas. A centrifugal force dust collector characterized by being provided.