JPS6182856A - Cyclone - Google Patents

Abstract

PURPOSE:To diminish the pressure drop of a cyclone and to make the cyclone efficient by providing both a couple of inlet pipes of fluid in the circumferential direction and a couple of discharge pipes of fluid to the center of the cyclone symmetrically with each other and providing a plate by which fluid is induced to the discharge pipes. CONSTITUTION:Two pieces of inlet pipes 3 of fluid are fitted to the opposite sides which are opposed in the circumferential direction o a cyclone. Also two pieces of discharge pipes 4 are provided to the eccentric position of point symmetry for the center of cyclone on the upper surface of the cyclone wherein the above position is in the specified relation to the inlet pipes 3 of flow. Furthermore an induction plate 5 by which the rotary fluid is induced to the discharge pipes 4 is provided. When the cyclone is constituted like this method, the pressure drop is diminished and the motive power is remarkably decreased.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to a cyclone that separates solid particles from a fluid containing solid particles such as dust. Regarding cyclones with small pressure loss.

[Conventional technology]

In a cyclone, a conical part is pressed against the lower part of a cylindrical part, and a fluid containing solid particles flows in the tangential direction of the cylindrical part at a speed of about 10 to 20 m/sec to generate a swirling flow, and the solid particles are centrifuged by centrifugal force. This is a device that allows the liquid to flow down along the inner wall and extract it downward from the bottom of the cone, while extracting the separation fluid upward from the center to separate the solid particles and the fluid. Cyclones have a simple structure and no movement mechanism, and are used efficiently as a separation device for solid particles with a particle size of about 5 to 2008 Lm, and are also widely used as the main part of gas-solid heat exchangers in cement manufacturing equipment. .

The drawback of the cyclone is that it has a large pressure loss and requires a high powered fan, and it is desired to reduce the pressure loss without reducing the 4J dust efficiency.

On the other hand, conventionally, two fluid inlet pipes are provided at opposing positions in the circumferential direction, and the number of installed cyclones is reduced.

There are known cyclones designed to improve overall efficiency in terms of compatibility with piping systems and other aspects.

[Problem that the invention seeks to solve]

The present inventor Nagisa focused on such cyclones and conducted research to significantly reduce the pressure loss and improve efficiency.
It has been found that pressure loss can be significantly reduced by making structural changes to such cyclones.

The present invention was developed based on such knowledge, and
The purpose is to provide a cyclone with low pressure loss.

Means for Solving Problem C] The gist of the present invention to achieve the above object is to provide two fluid inlet pipes at opposing positions in the circumferential direction, and to install a fluid discharge pipe on the upper surface of the cyclone at the center of the cyclone. The cyclone is characterized in that two guide plates are provided point-symmetrically with respect to each other, and guide plates for guiding the swirling fluid to the two discharge pipes are suspended within the cyclone body.

The present invention will be described in detail below with reference to one drawing. FIG. 1(a) is a side view of an embodiment of the present invention.

FIG. 1(b) is a plan view, and FIG. 1(C) is a view taken along the line A-A.

The cyclone of the present invention includes two fluid manifold pipes 3 and two fluid discharge pipes 4, and includes a guide plate 5 hanging below the fluid discharge pipes 4 within the cyclone body.

The two fluid inlet pipes 3 are mounted on opposite circumferential sides of the cyclone, ie, with a phase difference of 180 degrees.

The two fluid discharge pipes 4 are provided on the upper surface of the cyclone at eccentric positions that are symmetrical with respect to the center of the cyclone and have a certain relationship with the fluid inlet pipe 3. The relative positions of the fluid discharge pipe 4 and the fluid inlet pipe 3 are as follows.

That is, it is provided at a position where a portion of the fluid flowing in from one fluid inlet pipe is smoothly guided to the discharge pipe 4 by the guide plate 5 immediately before colliding with the fluid flowing in from the other fluid inlet pipe.

The guide plate 5 is for guiding the fluid in the swirling flow of the fluid in the cyclone near the center of the cyclone to the fluid discharge pipe.
The shape is not limited as long as it is suspended in the cyclone, and its shape is not limited as long as it is an appropriate shape from a fluid engineering point of view.1 For example, a circular guide vane-like thing made by dividing a fluid discharge pipe lengthwise into two can be used as a fluid discharge/d. It is preferable to install it so that it is connected to J1i and hang vertically downward.

:iS1 Figure (C) is a view taken along the line A-A in Figure 1 (a), in which a semicircular guide plate 5 of the same size as the fluid discharge pipe is connected to the fluid discharge pipe 4 and hangs down. The above example is shown, but the opening dimensions of the gap between the guide &5 and the cyclone inner wall at the part immediately before the swirling flow inside the cyclone collides with the fluid inlet pipe are as shown in the figure. It is preferable that the width is larger than 1/2 of the horizontal width a of the entrance portion of the pipe.

[Effect]

The cyclones of the present invention have substantially the same dust collection efficiency at substantially the same dimensions and the same processing fluid volume, and have significantly lower pressure drop. The reason for this is not necessarily clear, but in conventional cyclones, a) swirling flow or solid particles are unnecessarily repeated even after separation by centrifugal force, which increases pressure loss, and b) The collision between the swirling flow and the inflow fluid flowing in from the fluid inlet pipe can cause a drop in solid separation performance, and the large collision loss can be pointed out as causes for the increase in pressure loss.

In the present invention, there is a guide plate and a discharge pipe that guide a part of the fluid to the outside of the cyclone just before this merging and prevent deterioration of separation performance and increase in pressure loss due to the merging, so that dust collection is possible as described above. It is believed that this produces an excellent effect of significantly reducing pressure loss without reducing efficiency.

〔Example〕

A gas containing raw material particles for cement firing was supplied to a cyclone with a body diameter of 392 mmφ, and tests were conducted using a conventional cyclone with two fluid inlet pipes and one discharge pipe, and a cyclone of the present invention shown in Fig. 1. As a result, the results shown in Table 1 were obtained.

Dimensions of example Cylindrical part, inner diameter 392mmφX220mmH circle 2D FB
: 362 mm H person's bottom part 1 width 72 mm x height 15
3mmH Discharge pipe: Inner diameter 147mmφ x 2 Gap between guide plate and wall! l: Example 1: 54mm (=3a/4) Example 2:
36mm (= a/2) Comparative example 3: 18mm (
=a/4) Table 1 Dust collection efficiency Pressure loss Conventional shape 89.6% 220mmAq Example 1
91.6% 151mmAq Example 2 90.9
% 107mmAq comparative example 80.2% 9
3 mmAq As is clear from Table 1, the cyclone of the present invention can reduce pressure loss without reducing dust collection efficiency. 1. In the comparative example, the gap between the guide plate and the inner wall is narrowed, and although the pressure loss is greatly reduced, the dust collection efficiency is also reduced, which is not preferable.

〔Effect of the invention〕

Since the cyclone of the present invention is constructed as described above, it has the effect of reducing pressure loss and significantly reducing power consumption.

[Brief explanation of drawings]

FIG. 1(L) is a side view of an embodiment of the cyclone of the present invention, FIG. 1(b) is a plan view thereof, and FIG. 1(C) is a view taken along the line A-A. l... Cylindrical part, 2... Conical part. 3...Fluid inlet pipe, 4...Fluid discharge pipe. 5... Guidance board.

Claims (1)

[Claims] 1 In the cyclone, two fluid inlet pipes are provided at opposing positions in the circumferential direction, two fluid discharge pipes are provided on the top surface of the cyclone symmetrically with respect to the center of the cyclone, and swirling fluid is guided to each of the two discharge pipes. A cyclone characterized by a guiding plate suspended inside the cyclone body.