JPH0527010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granular material injection system used for charging pulverized coal into a coke oven, injecting pulverized coal in a boiler, and other fluid transportation of granular materials.

As described above, the present invention generally relates to an apparatus for injecting granular material, and as an example, a case will be described in which pulverized coal is charged into a coke oven.

Conventionally, the above-mentioned apparatus generally uses a rotary feeder to charge powdered coal into a furnace (carbonization chamber) in a state of natural fall.

However, since pulverized coal is light and small, its packing density is low when it falls naturally, and the packing density tends to be lower in the upper part of the furnace than in the lower part in the height direction of the furnace. Coke carbonized in a low-density state lacks strength, has a high powder content, and has poor productivity. For this reason, an accelerated charging method has been considered, in which the material is charged together with gas at high speed, but this method has the following drawbacks.

That is, (a) it is difficult to separate the carrier gas and the pulverized coal, and the pulverized coal along with a large amount of gas overflows into the furnace, and is carried out of the furnace, causing a carry-over phenomenon.

(b) The carbonization chamber in the coke oven is cooled by the carrier gas, causing energy loss and causing cracks in the brick joints, causing gas leaks.

(c) Packing density is difficult to increase due to gas inflow.

As described above, in order to overcome the above-mentioned difficulties, the inventor of the present invention has previously invented and separately disclosed a powder injection device. (Japanese Patent Application No. 59-12076) According to the invention, most of the above-mentioned problems can be solved.

The present invention further improves the above disclosed device,
It is an object of the present invention to provide a powder injection system that can save more power than that device and can further reduce the emission of dust-containing gas into the atmosphere.

The present invention will be described with reference to drawings showing one embodiment. In FIG. 1, a cylinder 2 having an end wall 1 at one end has an outflow pipe 3 penetrating through the end wall 1, and the outflow pipe 3 is The suction section 6 of the blower 5 is provided by the first passage 4.
The discharge section 7 of the blower 5 is communicated with one end of the cylinder 2 through a second passage 8. The powder supply device 9 is communicated with the second passage 8. A powder particle characterized in that a device for swirling the fluid brought into the cylinder 2 from the passage 8 in the cylinder 2 is formed, and an end plate 11 is provided at the other end of the cylinder 2 with a slit 10 in between. It is a body injection system.

In the figure, 13 is a flow rate adjustment valve, 14 is a rotary feeder, 15 is a coke oven (carbonization chamber), and 16 is an input port. 17 indicates powdered coal.

Further, as mentioned above, as an example of a device for swirling the fluid (air in this case) brought from the second passage 8 within the cylinder 2, the blower 5 is used.
The end of the second passage 8 communicating with the discharge part 7 of the cylinder 2
It is provided in such a way that it communicates in the tangential direction.

By forming it in this way, the fluid fed into the cylinder 2 is swirled. In addition to the above, this device may be rotated by providing a fan or the like inside the cylinder 2.

The operation of this invention will be explained with reference to FIG.
First, the blower 5 is operated to send air as a fluid into the cylinder 2 through the second passage 8, and the rotary feeder 14 is opened to feed the powdered coal 17 into the second passage 8.
supply to. This pulverized coal 17 is selected by the energized air and fed into the cylinder 2. Inside the cylinder 2, the air is rapidly swirled due to the configuration and moves in the direction of arrow A.

Therefore, the pulverized coal 17 gathers near the circumferential surface of the cylinder 2 due to the centrifugal force of the same rotation, is caused to advance downward in the figure, and is then injected into the carbonization chamber 15 from the slit 10. On the other hand, the air descends as shown in the figure while swirling, hits the end plate 11, reverses itself there, moves upward while swirling as shown by arrow B, exits from the outflow tube 3 to the outside of the cylinder 2, and reaches the first It is sucked into the blower 5 through the passage 4, discharged from the discharge section 7, and thereafter circulated as described above.

Note that the other end of the cylinder 2 is formed in a flared shape, but this is just an example, and there is no problem even if the outer cylinder 2 has the same shape.

Further, as disclosed in Japanese Patent Application No. 59-12076, the cylinder 2 may be made horizontal and the scroll may be placed next to the end plate 11.

Due to the strong free vortex generated in the upper part of the end plate 11, a strong negative pressure is generated in the center of the upper surface of the end plate 11, so that only air flows toward the center of the end plate 11 and reverses. However, the powdered coal 17 is injected from the slit 10 due to the inertial force of the swirling descent.

In Figure 1, pulverized coal 17 is used for ease of understanding.
is shown as being separated on both sides of the cylinder 2, but in reality it is distributed and injected almost circularly.

Next, in FIG. 1, reference numeral 12 denotes a fluid intake section, which is provided in communication with the suction section 6 of the blower 5. This intake part 12 is formed so that a slight amount α of fluid (air in this case) flows in, and this fresh air dilutes the air conveying the powdered coal and removes the fine dust contained in the powdered coal 17. (Pulverized coal) is prevented from becoming high in dust concentration due to circulation and accumulation. Furthermore, the above structure allows air to flow out of the slit 10 in an amount approximately equal to α. The air flowing out from the slit has the advantage of increasing the injection speed of the pulverized coal.

In FIG. 1, if the amount of fluid flowing out from the outflow cylinder 3 is c and the amount of inflow from the fluid intake part 12 is α, the discharge amount of the blower 5 is c+α, and the amount of fluid flowing out from the cylinder 2 is
The fluid flow rate at the inlet 18 is c+α (ignoring the amount of pulverized coal), the flow rate from the slit 10 is approximately α, and the flow rate at the outflow tube 3 is c.

When the appropriate amount of pulverized coal has been charged as described above, the rotary feeder 14 is closed to stop the inflow of pulverized coal, and the flow rate regulating valve 13 of the fluid intake section 12 is completely opened for a while to immediately clean the conveying air. The accumulated pulverized coal powder is discharged from the slit 10.

This invention is constructed as described above, and by communicating the outflow pipe 3 with the suction portion 6 of the blower 5, the power of the blower 5 can be reduced compared to a device not constructed in this manner. Furthermore, compared to a device in which the outflow cylinder 3 is open to the outside, the outflow of the dust-containing fluid to the outside can be greatly reduced. Further, in the case of an apparatus provided with the fluid intake section 12, the injection speed of the propellant such as powdered coal can be further increased, and fine dust can be prevented from circulating and accumulating in the conveying air, resulting in a high dust concentration.

Although the above example shows the case where gas is used as the carrier fluid, this system is not limited to this, and the system uses fluid as the carrier liquid and separates and jets powder or granules from the liquid (for example, for electric power use). It is also highly effective for the separate injection of coal from coal-water slurry, which is currently being developed as a fuel for boilers.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a diagram schematically showing a powder injection system. 1... End wall, 2... Cylinder, 3... Outlet pipe, 4...
...First passage, 5...Blower, 6...Suction part, 7...
...Discharge portion, 8...Second passage, 9...Powder supply device, 10...Slit, 11...End plate.

Claims (1)

[Scope of Claims] 1. An outflow cylinder is provided through the end wall of a cylinder having an end wall at least one end, and the outflow cylinder is communicated with the suction part of the blower through a first passage, and the outflow cylinder is connected to the suction part of the blower through a first passage. a device that communicates with one end of the cylinder through a second passage, a powder supply device that communicates with the second passage, and a device that swirls the fluid brought into the cylinder from the second passage within the cylinder. A granular material injection system characterized in that the cylinder has an end plate formed at the other end thereof with a slit in between. 2 An outflow tube is provided through the end wall of the cylinder having an end wall at least one end, the outflow tube is communicated with the suction part of the blower through a first passage, and a fluid intake part is communicated with the suction part. , a discharge part of the blower is communicated with one end of the cylinder through a second passage, a powder supply device is communicated with the second passage, and the fluid brought from the second passage to the cylinder is connected to the cylinder. What is claimed is: 1. A powder and granular material injection system, characterized in that a device for rotating the cylinder is formed within the cylinder, and an end plate is provided at the other end of the cylinder with a slit in between.