JPS6139872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid particle separation device, and more specifically, it lowers solid particle groups with different terminal velocities due to differences in particle size or specific gravity, and separates them into an upward airflow. This invention relates to improvements in solid particle separation equipment for classification.

For example, as shown in Fig. 1, air is supplied from a supply pipe a and introduced into a spouted bed c through a vertical pipe b, as shown in Fig. 1. be done. The vertical tube b also serves as a classifying tube, and the wind speed inside the vertical tube b is kept higher than the terminal velocity of the target particles to be classified, and the target particles are taken out as shown by the arrow e. However, since the particles supplied from the spouted bed c to the vertical tube b are highly concentrated and sometimes fall in groups, they cannot be classified sufficiently in the classification zone d of the vertical tube b. Therefore, if the classification zone d is made sufficiently long in the height direction, it is thought that the classification performance will be improved, but making it unnecessarily high is
This is not a good method as it increases the size of the device. In addition, as shown in Fig. 2, instead of a vertical pipe, an inclined pipe f is used and this is folded back, and as shown in Fig. 3, a stepped portion g is formed on the inner surface of the inclined pipe f. By providing this, it is possible to increase the chances of particle groups floating in the airflow and improve separation efficiency, but when performing classification at high temperatures,
The heat resistance and abrasion resistance of the structure become a problem, and the structure becomes complicated.

The present invention aims to eliminate the above-mentioned drawbacks existing in the prior art.According to the present invention, solid particles can be reliably classified and a stable fluidized bed can be inhibited. Therefore, it is possible to classify limestone, lime mud, cement, etc. by calcining or other reaction equipment, glass raw material heating or granulation equipment, and reduce iron and coal gasified residue using the difference in specific gravity. This makes it possible to selectively and continuously extract target particles generated in a fluidized bed in direct steelmaking, etc., during operation.

For this reason, the configuration of the present invention includes an upper fluidized bed forming section and a vertically oriented first section located lower than the upper fluidized bed forming section and provided in communication with the fluidized bed section.
a first fluid supply pipe connected to the middle of the first classification pipe to form an upward airflow in the first classification pipe; a first fluid supply pipe provided below the first fluid supply pipe; a vertically oriented second classification tube communicating with the classification tube; a second fluid supply tube for forming an upward airflow in the second classification tube; and a lower hopper for receiving solid particles from the second classification tube. and a flow state of particles smaller than the target particles is formed in the first classification tube in a portion above the first flow supply tube with the first fluid supply tube as a boundary; The present invention is characterized in that particles larger than the target particles are deposited in the first classification tube and the second classification tube in the lower portion.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 6.

FIG. 4 is a longitudinal sectional elevational view showing the first embodiment of the present invention in which a separation device is attached to a small spouted fluidized bed of a fluidized bed kiln for firing cement raw materials, and FIG.
FIG. 3 is a cross-sectional plan view taken along cutting line A-A in the figure. Fourth
In the figures and FIG. 5, 1 is a first air supply pipe;
2 is a second air supply pipe; 3 is the first air supply pipe 1;
A vertical first classification tube 4 is connected to the upper fluidized bed forming section 6 and communicates with the first classification tube 3, and is provided below the first air supply tube 1 and communicates with the first classification tube 3. A vertically oriented second classification tube 5 is a lower hopper for receiving solid particles from the second classification tube 4;
The air supply pipe 2 is connected to the side of this lower hopper 5. Additionally, 7 is a particle extraction tube.

In the solid particle separation apparatus configured as shown in FIGS. 4 and 5, the first air supply pipe 1
The air from the second air supply pipe 2 enters the lower hopper 5 and flows upward through the second classification pipe 4. That is,
Although not shown, the first air supply pipe 1 and the second air supply pipe 2 are each provided with a pressure regulating device such as a pressure regulating valve, so that the pressure of the air supplied from the first air supply pipe 1 and the The pressure of the air supplied from the second air supply pipe 2 is adjusted to prevent the air from flowing back into the first air supply pipe 1 after rising from the second air supply pipe 2 into the second classification pipe 4. Also, the air from the first air supply pipe 1 is prevented from descending toward the second classification pipe 4. Therefore, the amount of air passing through the first classification tube 3 above the first air supply tube 1 is equal to the amount of air supplied from the first air supply tube 1 and the air supplied from the second air supply tube 2. It becomes the sum of the quantities.

Therefore, the amount of air supplied from the second air supply pipe 2 is adjusted so that the wind speed in the second classification pipe 4 becomes the fluidization start speed of the target particles. Then, while considering the amount of air supplied from the second air supply pipe 2, the amount of air supplied from the first air supply pipe 1 is determined as follows:
The wind speed in the first classification tube 3 is made to be the terminal velocity of the target particles.

Then, first, the particle group in the fluidized bed of the upper fluidized bed forming section 6 falls into the first classification tube 3, where the first
Air from the air supply pipe 1 crosses the particle group and diffuses it, and at the same time most of the fine particles lighter than the separation target particles are returned to the fluidized bed in the upper fluidized bed forming section 6 by the airflow from below. That is, since the wind speed of the rising air in the first classification tube 3 in the upper part of the first air supply tube 1 is set to the terminal velocity of the target particles, a fluid state is formed, and here, the first classification tube 3 will be carried out.

At this time, some of the microparticles that were not classified in the first classification, that is, some of the microparticles that are in the particle group that falls as a particle group at a high concentration, are transferred to the second classification along with the target particles. The fine particles fall into the classification tube 4, where they ride the upstream airflow of the packed layer, where the wind speed is set to the fluidization start speed and a deposited state (filled state) is formed, and are reliably connected to the target particles. separated and pushed up to the first classification tube 3,
The air is returned to the fluidized bed in the upper fluidized bed forming section 6 by the air current. That is, the second classification is performed by the second classification tube 4.

Figure 6 shows an example in which the separator of the present invention is attached to the lower part of a spouted bed type firing apparatus for cement raw materials in order to extract clinker of a predetermined particle size.
Since there is not much difference from the case shown in the figure, the same or equivalent parts are given the same reference numerals as in Fig. 4.

In addition, in the embodiment shown in FIGS. 4 and 6,
Although not shown, the upper fluidized bed forming section 6 forms the bottom of a fluidized firing furnace for firing cement raw materials, and the upper part of the fluidized bed forming section 6 serves as the fluidized firing section. Therefore, the light microparticles that rise inside the first classification tube 3 on the rising air current inside the first classification tube 3 and are returned to the fluidized bed forming section 6 are fired in the fluidized firing section, It becomes viscous and particles stick to each other and are granulated into large particles. Then, since the particles become large and heavy, they descend from the fluidized firing section and reach the first classification tube 3 from the fluidized bed forming section 6, where the first classification is performed as described above.
That is, in the embodiments shown in FIGS. 4 and 6, light particles that rise inside the first classification tube 3 on the rising air current inside the first classification tube 3 and are returned to the fluidized bed forming section 6 As for the fine particles, there is no need to take them out of the system from the fluidized bed forming section 6 as they are.

However, if it is necessary to take out the light fine particles returned to the fluidized bed forming section 6 out of the system as particles as they are, a suitable place on the upper part of the fluidized bed forming section 6 is used for discharging the fine particles. An outlet and an inlet for the solid particles to be supplied may be separately provided, and the fine particles may be discharged from the outlet together with the exhaust gas from the system.

As described above, the solid particle separation apparatus of the present invention includes an upper fluidized bed forming section, and a vertically oriented section located below the upper fluidized bed forming section and communicating with the fluidized bed forming section. a first classification tube; a first fluid supply tube connected to the middle of the first classification tube to form an upward airflow in the first classification tube; A vertically oriented second classification tube communicating with the first classification tube, and a second fluid supply tube for forming an upward airflow in the second classification tube, and a portion above the first fluid supply tube. A fluid state of particles smaller than the target particles is formed in the first classification tube, and particles larger than the target particles are deposited in the first classification tube and the second classification tube in the lower part of the first fluid supply tube. Since the state is created, the following effects are achieved. That is, it is possible to control the flow rate of both the classification tubes by controlling the amount of fluid supplied from both the fluid supply pipes, and therefore, the particle size or specific gravity of the target particles to be discharged can be controlled, and in particular, It is possible to control the particle size of the granulated particles in a granulation furnace using a spouted fluidized bed, maintain a stable fluid state, and increase flexibility in cooler selection, improve efficiency, and downsize the equipment. Energy saving is also possible. Furthermore, since the lower hopper is provided to accommodate the solid particles from the second classification tube, the separated target particles can be accommodated in this hopper and sent to the next process or the like at an appropriate time.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional elevation view showing one example of the conventional type, Figure 2 is a vertical sectional elevation view showing another example of the conventional type, and Figure 3 is a part of the inclined pipe shown in Figure 2. FIG. 4 is a longitudinal sectional elevational view showing the first embodiment of the present invention, FIG. 5 is a cross-sectional plan view taken along cutting line A-A in FIG. 4, and FIG. FIG. 2 is a longitudinal sectional elevational view showing a second embodiment of the present invention. 1...First air supply pipe, 2...Second air supply pipe, 3...First classification pipe, 4...Second classification pipe, 5...
...Lower hopper, 6...Upper fluidized bed forming section, 7...
Particle extraction tube.

Claims (1)

[Claims] 1. An upper fluidized bed forming section, a vertically oriented first classifying tube located below the upper fluidized bed forming section and provided in communication with the fluidized bed forming section, and a first classifying tube located in the middle of this first classifying tube. a first fluid supply pipe that is connected to form an upward airflow in the first classification pipe; and a second vertically oriented fluid supply pipe that is provided below the first fluid supply pipe and communicates with the first classification pipe. It consists of a classification tube, a second fluid supply tube for forming an upward airflow in the second classification tube, and a lower hopper for accommodating solid particles from the second classification tube; At the same time, a fluid state of particles smaller than the target particles is formed in the first classification tube in the upper part of the first fluid supply pipe, and a flow state of particles smaller than the target particles is formed in the first classification pipe in the lower part of the first fluid supply pipe and 2. An apparatus for separating solid particles, characterized in that a state of accumulation of particles larger than the target particles is formed in a classification tube.