JPH10129839A - Pyrite discharging device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To surely discharge pyrite in a pyrite hopper without causing a bridge phenomenon. SOLUTION: A pyrite hopper 19 provided with a cone part 23 for storing pyrite P, a gate valve 24 provided at a lower part of the cone part 23, and a jet water from a jet water pump 26 are supplied to the pyrite P discharged from the gate valve 24. 28
And a high-pressure water pipe 34 for branching the jet water 28 from the jet water pump 26, and a tilt angle α downward along the inside of the cone portion 23 and with respect to the axis S of the cone portion 23. And a first opening and connected to the high-pressure water pipe 34 via the first opening / closing valve 39a.
And the nozzles 37a, 37a 'are opened in the cone portion 23 with an inclination angle -α in the opposite direction to the nozzles 37a, 37a', and connected to the high-pressure water pipe 34 via a second on-off valve 39b. And second ejection nozzles 37b and 37b '.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pyrite discharging device.

[0002]

2. Description of the Related Art In raw coal pulverized by a pulverized coal machine,
It contains pyrite such as stones and iron flakes, but the pyrite cannot be pulverized by a pulverizer. For this reason, conventionally, a foreign matter discharge pipe is provided on the bottom of the casing located below the roller table of the pulverized coal machine, and the pyrite discharged from the foreign matter discharge pipe is supplied to a pyrite hopper constituting a part of the pyrite processing apparatus, Thereafter, the water is supplied to a post-processing step by jet water.

FIG. 7 is an overall configuration diagram of a conventionally used pulverized coal machine and a pyrite processing apparatus, wherein 1 is a pulverized coal machine and 2 is a pyrite processing apparatus.

In a casing 3 of the pulverized coal machine 1, a roller table 5 horizontally rotated by a driving device 4 and a plurality of circumferential positions of the roller table 5 arranged in contact with a coal pulverizing section on the upper surface of the roller table 5. And a pulverizing roller 6 for pulverizing coal in cooperation with the roller table 5 to obtain pulverized coal.

The lower end of the coal feed pipe 7 extending vertically through the upper surface of the casing 3 is located above the roller table 5, and the upper end is connected to a coal feeder 8.

A driving device 9 is provided in the upper part of the casing 3.
A rotary classifier 10 which is rotatable in the horizontal direction to separate coarse coal in the pulverized coal is arranged so as to be concentric with the outer periphery of the coal feed pipe 7 and is provided on the outer periphery of the rotary classifier 10. On the other hand, a hopper 11 having a plurality of slits (not shown) extending circumferentially along the slope is provided so as to be concentric.

The lower portion of the casing 3 has a primary air blowing pipe 1 positioned below the upper surface of the roller table 5.
The primary air 13 blown into the casing 3 from the primary air blowing pipe 12 is connected to a primary air nozzle 14 provided between the outer periphery of the roller table 5 and the inner periphery of the casing 3.
And can flow upward.

At the upper end of the casing 3, a slit (not shown) provided in the hopper 11 is crushed by the cooperation of the roller table 5 and the crushing roller 6, and rises with the primary air 13. The pulverized coal pipe 15 for feeding the pulverized coal that has passed through the rotary classifier 10 to the boiler burner is connected.

A foreign matter discharge pipe 16 extending downward to discharge the pyrite P dropped on the bottom of the casing 3 is connected to the bottom surface of the casing 3 so as to be inclined from a vertical state. A gate 18 is provided in the vicinity of the lower end portion so that the drive device 17 can open and close the passage in the foreign matter discharge pipe 16.

A pressure vessel-shaped pyrite hopper 19, which is one of the main components of the pyrite processing apparatus 2, is disposed below the foreign matter discharge pipe 16.
In the vicinity of the upper mirror 20 of the 9, a short pipe 21 inclined at substantially the same angle as the angle on the lower end side of the foreign matter discharge pipe 16 is connected, and the pyrite hopper 19 is connected to the lower end of the foreign matter discharge pipe 16 via the short pipe 21. ing.

The upper part of the pyrite hopper 19 is cylindrical,
The lower portion has an inverted truncated cone-shaped cone portion 23, and the cone portion 2
At the lower end of 3, a pyrite hopper discharge pipe 22 is formed.

The pyrite hopper discharge pipe 22 of the pyrite hopper 19 is provided with a gate valve 24, and the lower end of the pyrite hopper discharge pipe 22 is connected to a jet plunger pump 25.

A jet water pipe 27 provided with a jet water pump 26 is connected to the upstream side of the jet pulsation pump 25 in the fluid flow direction. A pipe 29 for transporting the pyrite mixed water 30 to a downstream treatment step by jet water 28 supplied from a pump 26 is connected.

FIG. 8 shows the pyrite hopper 19 of FIG.
9 and FIG. 1 are shown in a diametrical position in the cone portion 23 of the pyrite hopper 19.
As shown in FIG. 0, a pair of injection nozzles 31a whose tip portions open downward with the same inclination angle α in the same direction as viewed from the outside with respect to the axis S of the cone portion 23 when viewed from the outside with respect to the axis S of the cone portion 23 , 31b.

Pyrite P is a substance having a very poor fluidity, so that the water supply valve 3 is provided in the pyrite hopper 19.
The water 33 is supplied and stored from a water supply pipe 32 provided with a nozzle 2a.
As shown in FIG. 10, downward jet flow R is formed along the inner surface of the cone portion 23, and pyrite P having poor fluidity is fluidized by this jet flow 28 to discharge the pyrite hopper. The liquid is discharged to a pipe 22.

As shown in FIG. 8, the jet water pump 26
A high-pressure water pipe 34 for branching and extracting the jet water 28 from the nozzle. The high-pressure water pipe 34 is connected to the rear of each of the jet nozzles 31a and 31b. Is provided with an on-off valve 35.

In the figure, reference numeral 36 denotes opening and closing of the gate 18 by the driving device 17, starting and stopping of the jet water pump 26, opening and closing of the gate valve 24, opening and closing of the on-off valve 35, and water supply valve 32a.
Is a controller that controls the discharge of the pyrite P by opening and closing the P / I.

In the apparatus shown in FIG. 7, coal cut out from a hopper (not shown) is introduced into a coal feed pipe 7 by a coal feeder 8, falls down the coal feed pipe 7, and falls into a casing 3 of the pulverized coal machine 1. Falls on the roller table 5 inside. Since the roller table 5 is driven to rotate horizontally by the driving device 4, the coal dropped on the roller table 5 is pulverized by the cooperation of the roller table 5 and the pulverizing roller 6.

The pulverized coal is blown into the casing 3 from the primary air blowing pipe 12, and rises inside the casing 3 along with the primary air 13 rising above the roller table 5 through the primary air nozzle 14. Then, the hopper 11 enters the hopper 11 from a slit (not shown) provided in the hopper 11.

The coarse-grained coarse coal which has not been finely pulverized is supplied to a rotary classifier 10 driven by a driving device 9.
And fall again on the roller table 5 by sliding down the inner peripheral surface of the hopper 11 and further pulverized.

The pulverized coal which has not been classified by the rotary classifier 10 is supplied from the rotary classifier 10 to the pulverized coal pipe 15, and is supplied to the boiler burner through the pulverized coal pipe 15.

As described above, the coal is pulverized by the cooperation of the roller table 5 and the pulverizing roller 6. At this time, pyrite P such as stones and iron chips mixed in the coal is pulverized. Instead, the roller table 5 moves to the outer peripheral side of the roller table 5 due to the centrifugal force at the time of rotation and falls, and is pushed into the foreign matter discharge pipe 16 by a discharge plate (not shown) attached to the lower part of the roller table 5. At this time, since the gate 18 is open, the pyrite P that has fallen into the foreign matter discharge pipe 16 is introduced into the water 33 in the pyrite hopper 19 through the foreign matter discharge pipe 16 and is stored in the cone part 23 and in the upper part thereof. You.

When the pyrite P is stored in the pyrite hopper 19, the gate valve 24 is closed as described above, and the jet water pump 26 is stopped.

When discharging the pyrite P accumulated in the lower portion of the pyrite hopper 19, the driving device 17 is driven by the controller 36 shown in FIG. 8 to close the gate 18, the gate valve 24 is opened, and the jet water pump 26 is opened. , The jet water 28 is introduced from the jet water pump 26 through the jet water pipe 27 to the jet plunger pump 25, and the pyrite P is sucked by the ejector effect of the jet plunger pump 25, and the pyrite P is sucked together with the jet water 28. The mixed water 30 is transported to the downstream processing step through the pipe 29.

At this time, by opening the on-off valve 35 by the controller 36, a part of the jet water 28 is
Is supplied to the injection nozzles 31a and 31b via the fins to form a downward swirling flow R in the cone portion 23, thereby preventing the pyrite P from becoming difficult to be discharged due to the bridge phenomenon.

When the discharge of the pyrite P in the pyrite hopper 19 is completed, the controller 36 closes the gate valve 24 and the opening / closing valve 35, stops the jet water pump 26, opens the water supply valve 32a, and opens the water 33 from the water supply pipe 32. Is supplied and the gate 18 is opened.
Is taken into the pyrite hopper 19.

[0027]

In the conventional pyrite discharging apparatus described above, when the pyrite P is discharged, the jet water 28 is jetted from the injection nozzles 31a and 31b to form a swirling flow R, thereby forming the pyrite P. Although the fluidity is enhanced to prevent the problem that the pyrite P is not discharged due to the bridge phenomenon, the pyrite P has a very poor fluidity, and therefore, the injection nozzle 31
Even if the jet water 28 is jetted by the a and 31b, a flow path of the jet water 28 is formed, and a bridging phenomenon occurs due to the non-flow of the pyrite P in the other part. Had occurred.

In order to cope with the problem of the bridging phenomenon, various methods such as providing a close pressure prevention plate or the like in the cone portion 23 have been studied, but a very effective method has not been realized.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a pyrite discharging apparatus capable of reliably discharging pyrite in a pyrite hopper without causing a bridging phenomenon. It is the purpose.

[0030]

According to the first aspect of the present invention, there is provided a pyrite hopper having an inverted truncated conical cone portion at a lower portion for storing pyrite, a gate valve provided at a lower portion of the cone portion, A jet pulsation pump for transporting the pyrite discharged from the gate valve by the ejector effect by the jet water from the jet water pump, a high-pressure water pipe for branching the jet water from the jet water pump, and a tip portion inside the cone portion. A first injection nozzle which opens downward at an inclination angle with respect to the axis of the cone portion and has a rear portion connected to the high-pressure water pipe via a first on-off valve; A second opening, which is open downward at an angle of inclination opposite to that of the first injection nozzle with respect to the axis of the cone portion and whose rear portion is connected to the high-pressure water pipe via a second on-off valve, Those of the pyrite discharge device, characterized in that a jet nozzle.

According to a second aspect of the present invention, there is provided a pyrite hopper having an inverted truncated conical cone portion at a lower portion for storing pyrite, a gate valve provided at a lower portion of the cone portion, and a gas discharged from the gate valve. Jet jet pump for transporting pyrite by jet water from a jet water pump by an ejector effect, a high-pressure water pipe that branches jet water from the jet water pump and has an open / close valve at a base end, and A rotary injection nozzle rotatably penetrating through the cone portion and opening along the inner lower side of the cone portion and having a rear portion connected to the high-pressure water pipe via a rotary joint; and driving the rotation of the injection nozzle. The present invention relates to a pyrite discharging device comprising an ejection direction switching actuator.

According to the first aspect of the present invention, since the first jet nozzle and the second jet nozzle having different jet directions are provided in the cone portion of the pyrite hopper, jet water is jetted by the first jet nozzle. By repeating the operation of switching the jet water injection by the second injection nozzle,
The occurrence of the bridge phenomenon can be prevented, and the pyrite can be reliably discharged.

According to the second aspect of the present invention, the cone portion of the pyrite hopper is provided with the rotary jet nozzle that can switch the jet direction by the operation of the jet direction switching actuator. By repeating the operation of switching the jet water jet direction by
The occurrence of the bridge phenomenon can be prevented, and the pyrite can be reliably discharged.

[0034]

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

FIGS. 1 and 2 show an embodiment of the first aspect of the present invention. In the drawings, the same portions are denoted by the same reference numerals, and description thereof will be omitted.

In the embodiment shown in FIGS. 1 and 2, the cone 23 of the pyrite hopper 19 is
A pair of first injection nozzles 37 whose tip portions are open downward at the same inclination angle α in the same direction as viewed from the outside with respect to the axis S of the cone portion 23 and downwardly along the inside of the cone portion 23.
a, 37a ', and the first injection nozzles 37a, 37a
The connecting pipes 38a communicating with the rear portions of the respective a's are connected to the high-pressure water pipe 34 branched from the jet water pipe 27 downstream of the jet water pump 26 via a first on-off valve 39a.

On the other hand, the first injection nozzles 37a, 37
a ′ is a position shifted from the diametric position by 90 degrees,
The first injection nozzle 37a, the tip of which is directed downward along the inside of the cone portion 23 and with respect to the axis S of the cone portion 23,
A pair of second injection nozzles 37b and 37b 'which are opened at the same inclination angle -α in the opposite direction to 37a' are provided, and communicate with the rear portions of the second injection nozzles 37b and 37b '. The communication pipe 38b is connected to the high-pressure water pipe 34 via a second on-off valve 39b.

The first on-off valve 39a and the second on-off valve 3
9b can be opened and closed separately by the controller 36.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.

When discharging the pyrite P accumulated in the lower part of the pyrite hopper 19, the controller 36 drives the driving device 17 to close the gate 18, opens the gate valve 24 and drives the jet water pump 26. . Then, the jet water 28 is introduced from the jet water pump 26 to the jet plunger pump 25 through the jet water pipe 27, and the pyrite P is sucked by the ejector effect of the jet plunger pump 25, and the pyrite mixed water is jetted together with the jet water 28. It becomes 30 and is transported to a downstream processing step through a pipe 29.

At this time, the controller 36 controls the first on-off valve 3
When 9a is opened, the jet water 28 from the high-pressure water pipe 34 receives the first injection nozzles 37a, 37a 'through the connecting pipe 38a.
Spray nozzle 3 which is supplied to
7a and 37a ', the jet water 28 is injected so as to form a downward swirling flow R in the cone portion 23 as shown by a solid arrow in FIG. It is discharged from the discharge pipe 22.

On the other hand, the first injection nozzles 37a, 37
After the jetting of the jet water 28 by a ′, the controller 36 closes the first opening / closing valve 39a and opens the second opening / closing valve 39b. Have the same inclination angle -α as that of the second injection nozzle 3a.
As shown by the dashed arrows in FIG. 2, the swirling flow R ′ in the opposite direction is caused by the jet water 28 injected from the nozzles 7b and 37b ′.
Is formed.

Therefore, the first injection nozzles 37a, 37
Even if the jetting of the jet water 28 from 7a 'creates a flow path, for example, causing a bridge phenomenon and not discharging the pyrite P, the next second injection nozzle 3
The bridge is broken by the injection of the jet water 28 from 7b and 37b '.

Therefore, the first injection nozzles 37a, 37
The jetting of the jet water 28 by the a ′ and the jetting of the jet water 28 by the second jet nozzles 37b, 37b ′ are appropriately switched and repeated, so that the pyrite P is fluidized without causing a bridging phenomenon and is reliably discharged. Can be done.

FIGS. 3 to 6 show an embodiment of the second aspect of the present invention.
At the diametrical position of the cone portion 23, as shown in FIG. 5, the cone portion 23 is rotatably penetrated through the seal packing 40 and the bearing 41 so that the tip portion extends along the lower side inside the cone portion 23. Rotating injection nozzles 42a and 42b that are open are provided.

Further, the rear portions of the rotary injection nozzles 42a and 42b are connected via a rotary joint 43 to a high-pressure water pipe 34 provided with an on-off valve 35 at the base end as in FIG.

A rotary arm 44 is integrally provided outside the cone portion 23 of the rotary injection nozzles 42a and 42b, and the rotary arm 44 is rotated on a table 45 fixed outside the cone portion 23. Ejection direction switching actuators 46a and 46b comprising hydraulic or pneumatic cylinders or the like to be driven are provided, and the injection direction can be switched at a required rotation angle β as shown in FIG. Like that. Further, a support member 47 for supporting the rotary joint 43 is provided on the table 45.

Further, the controller 36 can switch the injection direction of the rotary injection nozzles 42a and 42b and open and close the on-off valve 35 by the injection direction switching actuators 46a and 46b.

The operation of the embodiment shown in FIGS. 3 to 6 will be described.

When discharging the pyrite P accumulated in the lower portion of the pyrite hopper 19, the driving device 17 is driven by the controller 36 to close the gate 18, the gate valve 24 is opened, and the jet water pump 26 is driven. . Then, the jet water 28 is introduced from the jet water pump 26 to the jet plunger pump 25 through the jet water pipe 27, and the pyrite P is sucked by the ejector effect of the jet plunger pump 25, and the pyrite mixed water is jetted together with the jet water 28. It becomes 30 and is transported to a downstream processing step through a pipe 29.

At this time, the opening / closing valve 35 is opened by the controller 36, and the injection direction switching actuators 46a and 46b shown in FIGS. 5 and 6 are reduced so that the rotary injection nozzles 42a and 42b as shown by solid lines in FIG. Is inclined so that the jet water 28 is injected from the rotary injection nozzles 42a and 42b so as to form a downward swirling flow R in the cone portion 23 as shown by the solid arrow. Thus, the pyrite P is fluidized and discharged from the pyrite hopper discharge pipe 22.

On the other hand, after the jet water 28 is jetted from the rotary jet nozzles 42a and 42b so as to form the swirling flow R, the jetting direction switching actuators 46a and 46b are extended by the controller 36, as shown in FIG. By rotating the rotary injection nozzles 42a and 42b by the angle β as shown in FIG.
4A and 4B by jet water 28 injected from
As shown by the dashed arrow, a swirling flow R 'in the opposite direction to that described above is formed.

Therefore, even if a flow path is formed due to the swirling flow R indicated by the solid arrow in FIG. 4 and a bridging phenomenon occurs and the pyrite P is not discharged, the reverse swirling flow R 'indicated by the broken arrow next occurs. , The bridge can be broken.

Therefore, the operation of the ejection direction switching actuators 46a and 46b causes the rotation of the rotary ejection nozzle 42.
By repeating the operation of switching the jetting direction of the jet water 28 by a and 42b, the pyrite P can be fluidized and reliably discharged without causing a bridging phenomenon.

It should be noted that the present invention is not limited to the above-described embodiment, and the injection nozzles 37a, 37a ',
37b, 37b 'and the number of rotary jet nozzles 42
The numbers of a and 42b can be arbitrarily changed.

[0056]

According to the first aspect of the present invention, the first jet nozzle and the second jet nozzle having different jet directions are provided in the cone portion of the pyrite hopper. By repeating the operation of switching the jet water injection and the jet water injection by the second injection nozzle, the occurrence of the bridge phenomenon can be prevented, and the pyrite can be reliably discharged.

According to the second aspect of the present invention, since the cone portion of the pyrite hopper is provided with the rotary injection nozzle capable of switching the injection direction by the operation of the injection direction switching actuator, the rotary nozzle is rotated. By repeating the operation of switching the jetting direction of the jet water by the jetting nozzle, the occurrence of the bridge phenomenon can be prevented, and the pyrite can be reliably discharged.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the invention described in claim 1;

FIG. 2 is a view as seen in the direction of arrow II in FIG.

FIG. 3 is a side view showing an embodiment of the invention described in claim 2;

FIG. 4 is a view taken in the direction of arrow IV in FIG. 3;

FIG. 5 is a side view showing details of a rotary injection nozzle unit in FIG. 4;

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

FIG. 7 is an overall configuration diagram of a conventional pulverized coal machine and a pyrite processing apparatus.

FIG. 8 is a side view showing an example of a conventional pyrite discharging device.

FIG. 9 is a view taken in the direction of arrows IX-IX in FIG. 8;

FIG. 10 is a view in the direction of the arrow X in FIG. 8;

[Explanation of symbols]

 Reference Signs List 19 Pyrite hopper 23 Cone section 24 Gate valve 25 Jet plunger pump 26 Jet water pump 28 Jet water 34 High-pressure water pipe 35 On-off valve 37a, 37a 'Injection nozzle 37b, 37b' Injection nozzle 39a On-off valve 39b On-off valve 42a, 42b Rotation Injection nozzles 46a, 46b Injection direction switching actuator P Pyrite R swirl flow R 'swirl flow S axis α inclination angle -α inclination angle

Claims (2)

[Claims] 1. A pyrite hopper having an inverted truncated conical cone portion at a lower portion for storing pyrite, a gate valve provided at a lower portion of the cone portion, and a pyrite discharged from the gate valve being supplied from a jet water pump. A jet plunger pump for transporting the jet water from the jet water pump by the ejector effect, a high-pressure water pipe for branching the jet water from the jet water pump, and a tip portion of which is directed downward along the inside of the cone and inclined at an angle to the axis of the cone. A first injection nozzle having an opening and a rear portion connected to the high-pressure water pipe via a first on-off valve, and a tip portion directed downward along the inside of the cone portion and with respect to an axis of the cone portion, A second injection nozzle having an opening angle opposite to that of the first injection nozzle and having a rear end connected to the high-pressure water pipe through a second on-off valve. Illite discharge device. 2. A pyrite hopper having an inverted truncated conical cone portion at a lower portion for storing pyrite, a gate valve provided at a lower portion of the cone portion, and a pyrite discharged from the gate valve being supplied from a jet water pump. A jet plunger pump that transports the jet water from the jet water pump by the ejector effect, a high-pressure water pipe having a switching valve at a base end thereof, and a tip part capable of rotating the cone part. A rotary spray nozzle that penetrates and opens along the inner lower side of the cone portion and has a rear portion connected to the high-pressure water pipe via a rotary joint, and a spray direction switching actuator that drives the rotation of the spray nozzle. A pyrite discharging device, comprising: