JPH09175632A - Coal supply device of coal crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply coal into a coal crusher securely by feeding coal into a vertical screw securely even if coal charged into a double hopper is high mois ture coal. SOLUTION: A coal supply device of a coal crusher is provided with a vertical screw 12 arranged on an upper side of the coal crusher 11, a double hopper 9 which receives coal 6 from a coal conveyance device 5, an inclined chute 10 which supplies coal 6 in the double hopper 9 to a side of the vertical screw 12 at a required inclination angle, a level detector 29 which detects a level of the coal 6 in the double hopper 9, and a controller 32 which inputs a signal 30 detected by the level detector 29 and a set value 31 and controls conveyance speed of the coal conveyance device 5 so that the level of coal in the double hopper 9 becomes a predetermined level. Press-in force 33 is generated in the coal 6 in the inclined chute 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal feeder for a coal crusher.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a slurry supply device 3 for supplying a slurry fuel 2 to a fluidized bed boiler 1, which is a coal transfer device including a conveyor driven by a transfer drive device 4 or other feeders. The coal 6 carried by 5 is thrown into a double hopper 9 composed of an upper hopper 7 and a lower hopper 8, and the coal 6 thrown into the double hopper 9 further comprises a double crusher via an inclined chute 10. The twin screw type vertical screw 12 (see FIG. 6) provided on the upper side of the crusher 11 is supplied from the side surface, and is fed to the coal crusher 11 at the lower part by the fixed amount downward extrusion feed by the vertical screw 12. It is supposed to be done. In the figure, 13 is a coal transport device 5,
It is a coal supply device including a double hopper 9, an inclined chute 10 and a vertical screw 12.

The coal 6 crushed by the coal crusher 11 is put into a storage hopper 14. A mixing device 15 is provided below the storage hopper 14, and the crushed coal 6 in the storage hopper 14 is supplied to the mixing device 15 via a cutout valve 16 and a water supply valve having a water supply valve 17. Water is supplied from the pipe 18, and the mixing blade 19 provided in the mixing device 15 is driven by the driving device 20 to perform mixing to obtain the slurry fuel 2. The slurry fuel 2 is supplied to the fuel pump 21 and the fuel supply pipe. It is supplied to the fluidized bed boiler 1 via 22.

5 and 6 show the details of the coal feeding device 13, in which a vertical screw 12 vertically provided on the upper side of the coal crusher 11 is provided in parallel in a screw casing 23. Screw blade 24a,
24b is driven to rotate by a single screw driving device 25, and the lower end of the inclined chute 10 is connected to the side surface of the intermediate portion of the screw casing 23 with an inclination angle α of about 60 to 75 °. ing. Reference numeral 26 in the figure denotes a slide gate provided below the lower hopper 8 of the double hopper 9.

In the above-mentioned coal supply device 13, the coal 6 which is conveyed by the coal conveying device 5 and is thrown into the upper hopper 7 of the double hopper 9 falls into the lower hopper 8 and is prevented from forming a bridge, and an inclined chute is formed. 10 is fed to the vertical screw 12 from the lower end of the inclined chute 10 and guided by the screw blades 24a and 24b which are rotating by the driving of the screw driving device 25 to the coal crusher 11 at the lower part for crushing. It has become.

[0006]

However, in the conventional coal feeder 13 of the conventional coal crusher 11 shown in FIGS. 5 and 6, the coal 6 carried by the coal carrier 5 is high due to rainwater or the like. In the case of moist charcoal (normal coal has a surface water content of about 10% or less, the surface water content is about 13 to 18%), wet fine powder adheres to the inner surface of the screw casing 23. As it grows, a spectacle-shaped deposit 27 as shown in FIG. 6 is formed between the screw casing 23 and the screw blades 24a, 24b, and thereby the deposit 27 is put on the inner surface of the lower end of the inclined chute 10. As a result, wet fine powder adheres and grows to form a deposit 28. When the deposit 28 grows, the inside of the inclined chute 10 is blocked and clogging occurs, and the coal feeder 13 is used. It arose a problem that supply of coal 6 into the coal pulverizer 11 becomes impossible.

Therefore, conventionally, in order to prevent such a problem from occurring, the high-moisture coal is not supplied to the coal supply device 13, and therefore the high-moisture coal needs to be dried before being supplied. It required some troublesome work.

[0008] The present invention has been made in view of the above situation, and even if the high-moisture coal is charged into the double hopper, the coal is surely sent to the vertical screw to supply the coal to the coal crusher. It is an object of the present invention to provide a coal supply device for a coal crusher capable of reliably performing the above.

[0009]

A first means of the present invention is as follows.
A vertical screw arranged on the upper side of the coal crusher, a double hopper for receiving coal from a coal carrier, an inclined chute for supplying the coal of the double hopper to a side surface of the vertical screw at a required inclination angle, and the double hopper. A level detector for detecting the level of coal in the hopper, a detection signal from the level detector and a set value are input so that the coal level in the double hopper becomes a predetermined level so that the transfer speed of the coal transfer device The present invention relates to a coal supply device for a coal crusher, which comprises:

The second means of the present invention is a vertical screw arranged above the coal crusher, a double hopper for receiving coal from the coal conveying device, and a vertical hopper for vertically guiding the coal in the double hopper downward. A coal feeder for a coal crusher, comprising: a chute; and a horizontal screw that is connected to a lower end of the vertical chute and horizontally feeds coal from the vertical chute to a side surface of the vertical screw. It is a thing.

In the first means of the present invention, by controlling the transfer speed of the coal transfer device such that the coal of a predetermined level is always present in the upper hopper of the double hopper, the coal in the inclined chute is moved downward by gravity. The indentation force of the can reliably supply the coal in the inclined chute to the vertical screw.

In the second means of the present invention, a vertical chute is provided on the lower side of the double hopper, is connected to the lower end of the vertical chute, and horizontally feeds coal from the vertical chute to the side surface of the vertical screw. Since a screw is provided, the coal fed to the horizontal screw after falling inside the vertical screw is forcibly supplied to the vertical screw by the rotation of the horizontal screw, and the coal is reliably supplied to the vertical screw. You can

Therefore, in the first and second means, even high-moisture coal can be reliably supplied to the vertical screw without causing clogging, so that the high-moisture coal is not conveyed to the coal supply device. It is not necessary to do so or to guide the coal to the coal supply device after drying the high-moisture coal, which is advantageous in operation.

[0014]

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

FIG. 1 shows the conventional coal crusher 11 of FIG.
1 shows an example of an embodiment for carrying out the invention according to claim 1 applied to the coal supply device 13 of No. 1, and those denoted by the same reference numerals in the drawings represent the same.

As shown in FIG. 1, in a structure similar to that of the coal feeder 13 shown in FIG. 5, a level detector for detecting the level of the coal 6 in the upper hopper 7 of the double hopper 9 is provided. 29 is provided. Further, the detection signal 30 detected by the level detector 29 and the set value 31 are input, and the coal driving device 5 is driven so that the coal level in the lower hopper 8 becomes a predetermined level. A controller 32 is provided for adjusting the device 4 to control the transport speed of the coal 6.

According to the configuration shown in FIG. 1, the level detector 2 detects the level of the coal 6 in the upper hopper 7 of the double hopper 9.
9, the transfer speed of the coal transfer device 5 is controlled so that the level of the coal 6 in the upper hopper 7 is always at the predetermined level set by the set value 31. It is always filled with coal 6, which causes a downward pushing force 3 due to gravity.
3 is generated, and the pushing force 33 causes the tilted chute 1
The coal 6 in 0 is surely sent to the vertical screw 12.

Therefore, even if the attachment 27 in the form of glasses as shown in FIG. 6 is formed on the inner surface of the screw casing 23 of the vertical screw 12, the attachment 27 is broken by the shearing force of the pushing force 33. As a result, the coal 6 is surely supplied to the vertical screw 12, the deposit 28 as shown in FIG. 5 does not occur on the inclined chute 10, and the coal is fed into the double hopper 9 by the coal conveying device 5. The coal 6 can be reliably supplied to the vertical screw 12, and thus the coal 6 can be reliably supplied to the coal crusher 11.

FIG. 2 and FIG. 3 show an example of an embodiment for carrying out the invention described in claim 2, in which a vertical chute 34 extending vertically downward is provided below the lower hopper 8 of the double hopper 9. At the lower end of the vertical chute 34, two screw blades 36 parallel to each other are provided in the screw casing 35.
a and 36b are provided, one end of which is connected to an intermediate portion of a biaxial horizontal screw 39 which is rotationally driven by a single screw driving device 37 provided at one end thereof via a power transmission unit 38, and the other end of which is provided. Is connected to the side surface of the vertical screw 12.

According to the structure shown in FIGS. 2 and 3, the coal 6 fed into the double hopper 9 by the coal conveying device 5 is used.
Falls in the vertical chute 34 and falls into the horizontal screw 39.
Since it is supplied to the vertical screw 12 by the forced pushing force 40 by the horizontal screw 39, it is possible to reliably supply the coal 6 to the vertical screw 12 without causing clogging as in the conventional case. You can

At this time, the level detector 29 for controlling the carrying speed of the coal carrying device 5 so that the coal 6 is always present in the upper level hopper 7 of the double hopper 9 at the predetermined level set by the set value 31. With the configuration including the controller 32, the coal 6 charged in the upper hopper 7 is reliably supplied to the horizontal screw by the downward pushing force 33 of the coal 6 filled in the vertical chute 34 due to gravity. be able to.

In the apparatus shown in FIG. 2, since the coal 6 in the upper hopper 7 is supplied vertically to the horizontal screw 39 through the vertical chute 34, the horizontal screw 39
Even if the spectacle-shaped deposit 27 as shown in FIG. 6 is formed, it is destroyed by the shearing force of the coal 6 falling vertically in the vertical chute 34, so that the generation of the deposit 27 is prevented. There is an advantage, so in this case it is possible to dispense with the level detector 29 and the controller 32.

As described above, even if the coal 6 supplied to the double hopper 9 is high-moisture coal containing a large amount of water,
Since it can be surely supplied to the vertical screw 12 and guided to the coal crusher 11 without causing clogging, the high-moisture coal is prevented from being conveyed to the coal supply device 13, or the high-moisture coal is dried before the coal is fed. There is no need to lead to the supply device 13, which is advantageous in operation.

[0024]

According to the coal feeder for the coal crusher of the first aspect of the present invention, the carrier speed of the coal carrier is controlled so that the coal of a predetermined level is always present in the upper hopper of the double hopper. The downward pushing force of the coal in the tilted chute due to gravity can reliably feed the coal in the tilted chute to the vertical screw.

According to the coal feeder of the invention of claim 2, a vertical chute is provided on the lower side of the double hopper, and the coal from the vertical chute is horizontally fed to the side surface of the vertical screw. Because I installed a screw,
The coal dropped into the vertical screw and supplied to the horizontal screw can be forcibly supplied to the vertical screw by the rotation of the horizontal screw, and the coal can be reliably supplied to the vertical screw.

Therefore, according to the first and second aspects of the invention, even high-moisture coal can be reliably supplied to the vertical screw without causing clogging, so that the high-moisture coal is supplied to the coal supply device. It is very advantageous in operation because there is no need to prevent it from being conveyed to the coal supply unit or to guide the high-moisture coal to the coal supply device after drying it.

[Brief description of the drawings]

FIG. 1 is a partially cut side view showing an example of an embodiment for carrying out the invention of claim 1.

FIG. 2 is a partially cut side view showing an example of an embodiment for carrying out the invention of claim 2.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a schematic diagram showing an example of a slurry supply device for supplying slurry fuel to a fluidized bed boiler.

FIG. 5 is a partially cut side view showing an example of a coal supply device of a conventional coal crusher.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

[Explanation of symbols]

 5 coal carrier 6 coal 9 double hopper 10 inclined chute 11 coal crusher 12 vertical screw 13 coal feeder 29 level detector 30 detection signal 31 set value 32 controller 34 vertical chute 39 horizontal screw α inclination angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumi Hirai 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office (72) Inventor Kinji Matsushita 2 Minatojima Nakamachi, Chuo-ku, Kobe-shi, Hyogo Prefecture 3-4 Abe Co., Ltd. Kobe Office

Claims (2)

[Claims] 1. A vertical screw disposed on the upper side of a coal crusher, a double hopper for receiving coal from a coal conveying device, and an inclination for supplying coal of the double hopper to a side surface of the vertical screw at a required inclination angle. A chute and a level detector for detecting the level of coal in the double hopper,
And a controller for inputting a detection signal from the level detector and a set value to control the transfer speed of the coal transfer device so that the coal level in the double hopper becomes a predetermined level. Coal feeder for coal crusher. 2. A vertical screw arranged on the upper side of the coal crusher, a double hopper for receiving coal from the coal carrier, a vertical chute for guiding the coal of the double hopper vertically downward, and a lower end of the vertical chute. A coal supply device for a coal crusher, comprising: a horizontal screw which is connected and horizontally supplies the coal from the vertical chute to a side surface of the vertical screw.