JPS5830209B2 - Separation and transportation method of powder and granular materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for separating and transporting granular materials such as coal, ore, and limestone.

Conventionally, a cyclone as shown in FIG. 1 has been used to separate the gas-transported powder and granular material.

In FIG. 1, gas a mixed with powder and granules enters the main body from the tangential direction, and the powder and granules are scattered toward the inner wall of the main body by centrifugal force due to rotational force within the main body.
The powder falls due to gravity along the inner wall and is taken out from the powder outlet C, while the separated gas is discharged into the atmosphere from the upper gas outlet d.

However, in the above-mentioned cyclone, 1) the granular material collides with the inner wall of the main body, causing severe damage to the device;

11) Separation performance of the cyclone decreases due to an increase in the amount of powder in the gas.

111) Gas mixed with powder and granules flows horizontally into the cyclone, so when sending gas from below to above, a bent pipe is always required before the cyclone entrance, and the transport pipe at the bent pipe part Severe wear.

There are drawbacks such as.

The present invention has been made with the aim of eliminating the above-mentioned drawbacks of the conventional means, and involves transporting gas mixed with powder and granules through a straight transport pipe, and transporting the gas mixed with powder and granules from below. A powder body of the same material as the powder body contained in the separation tank and mixed in the gas is fluidized to form a fluidized bed, and the powder body is sent from the lower side to the upper side. Particles in the gas are separated from the gas by being captured by a fluidized bed, the gas discharged from the fluidized bed is sent to a cyclone to separate fine powder, and the fine powder separated in the separation tank is transferred to the separation tank side. At the same time, the fine powder separated by the cyclone is also sent to the overflow pipe, and the powder and fine powder are transported together from the overflow pipe to the next process. It is characterized by:

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, a separation tank 3 having a cross-sectional area suitable for forming a fluidized bed 2 with powder and gas is connected above the transport pipe 1 extending in the vertical direction. An overflow pipe 4 facing diagonally downward is connected to a side part of the fluidized bed 2 slightly below the upper surface thereof, and a flow control valve 5 is installed in the middle of the overflow pipe 4 to control the discharge amount of powder and granules. A cyclone 6 is installed above the interior 0 of the separation tank 3, a gas outlet pipe 7 is attached to the upper part of the modified cyclone 6 so that gas can be introduced into the cyclone 6 from the direction of arrow X, and a cyclone 6 is installed in the lower part of the cyclone 6. Connect a fine powder overflow pipe 8 for discharging the fine powder separated by
The fine powder overflow pipe 8 is connected to the upstream side of the part of the overflow pipe 4 where the flow rate control valve 5 is provided.

Gas G mixed with powder and granules passes through a transport pipe 1 and enters a fluidized bed 2 in a separation tank 3 from below.

Then, the flow rate of the gas decreases and the gas passes through the particles forming the fluidized bed 2 and rises while maintaining the fluidized state of the fluidized bed 2.

Further, while the gas passes through the fluidized bed 2, the powder and granules mixed in the gas collide with the powder and granules of the fluidized bed 2 and are captured, and the powder and granules become part of the fluidized bed 2. .

The gas that has been separated from the powder and granules and exits to the upper part of the fluidized bed 2 enters the cyclone 6 from the upper part of the separation tank 3, where the cyclone 6 separates the fine powder, and the gas is discharged to the outside from the gas outlet pipe 7.

The fine powder separated by the cyclone 6 is sent to the overflow pipe 4 through a fine powder thermoflow pipe 8.

As the amount of powder and granules captured in the fluidized bed 2 increases, the level of the fluidized bed 2 tends to rise, but by opening the flow rate control valve 5, the powder and granules are transferred to the overflow pipe 4 so that the level remains approximately constant. and discharged to the outside.

The fine powder separated by the cyclone 6 and sent to the fine powder heat flow tube 8 is also discharged to the outside through the overflow tube 4 together with the powder and granules forming the fluidized bed.

FIG. 3 shows an example in which the device shown in FIG. 2 is actually applied to a high-temperature dry desulfurization device that removes hydrogen sulfide in fuel gas by reacting it with an absorbent 9.
An overflow pipe 11 having a flow rate control valve 12 is attached diagonally downward to the side of the transport fluidized bed 1.
A conduit 15 having a powder valve 16 is connected to the lower part of the intermediate base 14, and a flow rate control valve 18 is connected to the side of the conduit 15. The lower end of the transport pipe 1 is connected above the intermediate base 14, and the lower end of the overflow pipe 4 is connected to the side of the regeneration tower 19.

In addition, 20 in the figure is the dispersion plate installed in the separation tank 3, and 20 in the figure
The same reference numerals as those shown in the figures indicate the same elements.

Although not shown in the drawings, the fluidized absorption tower 10 is supplied with fuel gas from below and an absorbent.The absorbent is fluidized by the fuel gas, and the hydrogen sulfide in the fuel gas is absorbed by the absorbent and sulfurized. The fuel gas from which hydrogen has been removed is sent from the fluidized absorption tower 10 to fuel consuming equipment.

On the other hand, the absorbent that has absorbed hydrogen sulfide in the fluidized absorption tower 10 rises to the attachment part of the overflow pipe 11, flows out into the overflow pipe 11, flows down the overflow pipe 11, and reaches the intermediate group 14. be introduced.

Further, a transport gas such as an inert gas is supplied to the intermediate base 14 from the transport gas pipe 17, and the layer height of the absorbent in the intermediate base 14 fluctuates drastically due to the transport gas, making it fluid.

Therefore, the absorbent that has reached the lower end of the transport pipe 1 is introduced into the transport pipe 1 together with the transport gas, ascends the transport pipe 1, and enters the lower part of the separation tank 3.

The flow rate of the gas mixed with the absorbent introduced from the transport pipe 1 into the separation tank 3 decreases within the separation tank 3.

While passing between the absorbents forming the fluidized bed 2, the absorbent in the gas collides with the fluidized bed 2 and is captured.

The gas flows into the cyclone 6 from the upper part of the fluidized bed 2, where the fine absorbent in the gas is separated, the purified gas is discharged to the outside, and the fine absorbent overflows from the fine powder overflow pipe 8. It is sent to flow tube 4.

In addition, the absorbent separated in the separation tank 3 forms a fluidized bed 2 with the gas mixed with the absorbent that is continuously sent, rises through the dispersion plate 20 while being fluidized, and flows into the overflow pipe 4. It flows out and is sent to the regeneration tower 19 together with the fine absorbent sent from the fine powder overflow pipe 8, where it is regenerated and used again.

Note that the embodiments of the present invention are not limited to the above-described embodiments, and it goes without saying that various changes may be made within the range without departing from the gist of the present invention.

Since the method for separating and transporting granular materials of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

■) Powder in the gas is captured by a fluidized bed made of the same powder as the powder, so the powder in the gas rarely hits the equipment directly, resulting in wear and tear on the equipment. becomes less.

■) Due to its simple structure, it can be used at high temperatures and high pressures.

■) Since the transport pipe can be made straight without any bends, there is less wear and damage to the transport pipe.

(2) The captured fine powder is combined with the powder outside the fluidized bed, so there is no recirculation within the fluidized bed.

[Brief explanation of drawings]

Figure 1 A 2 is an explanatory diagram of the conventional example, 2 @ is an explanatory diagram of the present invention, and Figure 3 is the one in Figure 2 used for separating and transporting an absorbent that absorbs hydrogen sulfide in fuel gas. FIG. In the figure, 1 is a transport pipe, 2 is a fluidized bed, 3 is a separation tank, 4 is an overflow pipe, 6 is a cyclone, and 8 is a fine powder overflow pipe.

Claims (1)

[Claims] 1. Transport the gas mixed with powder and granules through a straight transport pipe, feed the gas mixed with the powder and granules from below into a separation tank, and store the gas in the separation tank and mix it into the gas. The powder and granules made of the same material as the powder and granules are fluidized to form a fluidized bed, and the powder and granules in the gas sent from the bottom to the top are captured by the fluidized bed and separated from the gas. The gas discharged from the tank is sent to a cyclone to separate fine powder, and the fine powder separated in the separation tank is flowed out to an overflow pipe that is attached to the side of the separation tank and faces diagonally downward, and is separated by the cyclone. A method for separating and transporting powder and granular material, characterized in that the resulting fine powder is also sent to an overflow pipe, and the powder and granule are transported together from the overflow pipe to the next process.