JP3169162B2 - Humidifying kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a humidifying kneader,
More particularly, the present invention relates to a humidifying kneader that humidifies and kneads powdery combustion ash produced by burning heavy oil in which super heavy oil is emulsified, thereby granulating the combustion ash to reduce the volume.

[0002]

BACKGROUND OF THE INVENTION A basin called the Orinoco Belt located in the northern basin of the Orinoco River in Venezuela, South America, has abundant ultra-heavy oil (commonly referred to as Orinoco Tar). This super-heavy oil has the property of solidifying at room temperature and has a problem in handling. However, recently, a technology for emulsification has been developed and problems in handling have been solved, so that it has been used as a fuel for thermal power plants and the like.

In a thermal power plant, combustion ash generated when fuel such as heavy oil is burned is usually collected by an electric dust collector. When transporting the collected powdered combustion ash to a processing plant, the volume is reduced by humidifying and kneading with a humidifying kneader to reduce the volume, thereby increasing the transport efficiency. However, the powdery combustion ash produced by burning the fuel obtained by emulsifying the orinoco tar generates heat when humidified and kneaded, and the humidified humidified ash tends to solidify when cooled.
Furthermore, the humidified combustion ash has a troublesome property that the tackiness is remarkably increased particularly in an excessively humidified state, and the ash easily adheres to and solidifies on a screw blade, a rotating shaft and the like.

Heretofore, as a humidifying and kneading machine for humidifying and kneading this kind of combustion ash, a humidifying and kneading machine in which a spray nozzle for humidifying is added to a screw conveyor has been generally used.

[0005]

However, the conventional screw conveyor type humidifying and kneading machine has a large conveying capacity but a small kneading ability, so that the humidification unevenness in the combustion ash (excessive moisture in the combustion ash and insufficient water in the combustion ash). Is formed), and the portion having excessive moisture tends to adhere to the screw blades and the rotating shaft, so that troubles are apt to occur, and the humidification accuracy is poor.

That is, a humidifying kneader for handling combustion ash which easily adheres and solidifies when humidified and kneaded like combustion ash produced by burning fuel emulsified with super heavy oil such as orinoco tar,
It is important to equalize the amount of water humidified with respect to the combustion ash per unit amount while keeping the conveyance amount of the combustion ash, and to prevent the occurrence of uneven humidification. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a humidifying and kneading machine suitable for handling combustion ash which easily adheres and solidifies to an apparatus by humidifying and kneading.

[0007]

In order to achieve the above object, the present invention provides a humidifying kneader for humidifying and kneading powdery combustion ash produced by burning heavy oil emulsified with super heavy oil. And
A cylindrical casing having a supply port for the combustion ash at one end and a discharge port for humidified and kneaded humidified combustion ash at the other end; a screw blade rotatably provided in the casing; And a kneading unit, and a kneading unit is composed of a paddle conveyor in which a propeller having a plurality of blades is arranged and fixed at predetermined intervals on the rotating shaft, and a rotating power for rotating the rotating shaft. A source and a spray nozzle for spraying water onto the combustion ash conveyed in the casing by the composite conveyor, wherein the paddle blade of the propeller is formed by cutting out the original shape of the screw blade, and the adjacent The paddle blades of the propeller are arranged so as to partially overlap each other when viewed from the axial direction of the rotation shaft.

According to the first aspect of the present invention, a predetermined conveying capacity and kneading are achieved by using a screw conveyor having a large conveying capacity but a small kneading capacity and a paddle conveyor having a large kneading capacity but a small conveying capacity. The paddle blades constituting the propeller of the paddle conveyor are formed by cutting out the original shape of the screw blades, and the paddle blades of the adjacent propellers partially overlap when viewed from the axial direction of the rotating shaft. Was placed. This allows the paddle conveyor to increase the transfer capacity while maintaining the kneading capacity, thereby reducing the difference in transfer capacity between the screw conveyor and the paddle conveyor. Accordingly, the transport balance of the combustion ash from the supply port to the discharge port of the casing is improved, and the transport amount of the combustion ash in the casing can be made constant. As a result, the humidification amount per unit amount of the combustion ash conveyed in the casing is equalized, and the humidification unevenness does not occur due to the kneading ability of the paddle conveyor. Makes it difficult to adhere.

According to the second aspect of the present invention, the composite conveyor comprises a front screw conveyor, a paddle conveyor, and a rear screw conveyor in order from the supply port side of the casing, and the conveying capacity of the paddle conveyor is supplemented by the front and rear screw conveyors. Therefore, the transport amount of the combustion ash can be made more constant. According to the third aspect, water is intermittently sprayed from the spray nozzle, and the humidified humidified combustion ash and the non-humidified combustion ash are kneaded. As a result, the dry combustion ash is kneaded so as to enclose the dry combustion ash that is not humidified with the humidified combustion ash.

According to the present invention, an air nozzle is provided at the front stage of the screw conveyor, and the blowing of air from the air nozzle is interlocked with the intermittent spraying of the spray nozzle. That is, to increase the throughput of the humidifying kneader, it is necessary to increase the diameter, pitch, and number of rotations of the screw blades of the screw conveyer constituting the transfer section, and the humidifying kneader becomes large. However, by pressurizing from the supply port side with the pressurized air from the air nozzle as in claim 4, the excess capacity of the transport capacity generated by humidification of the combustion ash to reduce the volume is filled, and the transport efficiency is increased. Therefore, the transport capacity of the humidifying kneader becomes large.

According to the fifth aspect, since the baffle plate is provided at the boundary position between the front screw conveyor and the paddle conveyor, the combustion ash becomes full in the casing area of the front screw conveyor and is compacted. The compacted combustion ash is sent out from the screw conveyor to the paddle conveyor at a constant bed height equal to the height of the baffle plate. As a result, a certain amount of combustion ash can be sent from the first screw conveyor to the paddle conveyor, so that the humidification accuracy can be further improved regardless of whether the humidification is performed by the first screw conveyor or the paddle conveyor, and adhesion of the humidification combustion ash. If it becomes difficult.

According to the sixth aspect of the present invention, there is provided a nozzle for directly spraying the combustion ash conveyed in the casing from above, and a nozzle for spraying the side surface in the casing to increase the humidity atmosphere in the casing. Thereby, the water directly hitting the screw blade, the paddle blade, or the rotating shaft can be reduced and the humidification accuracy can be improved, so that the humidified combustion ash hardly adheres to the screw blade, the paddle blade, or the rotating shaft. .

According to the seventh aspect, since the humidification is performed in the area of the paddle conveyor having a large kneading capacity, the humidification can be easily performed uniformly. This is because the paddle conveyor has the above-described structure, so that the conveying capacity can be increased in addition to the kneading capacity, so that combustion ash does not stay on the paddle conveyor even if the paddle conveyor is lengthened to secure a conveying distance for humidification. It is achieved by what can be done.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a humidifying kneader according to the present invention will be described below in detail with reference to the accompanying drawings.
The humidifying and kneading machine according to the present invention is particularly for humidifying and kneading powdery combustion ash produced by burning a fuel obtained by emulsifying a super heavy oil such as orinoco tar.

As shown in FIG. 1, the humidifying and kneading machine 10 mainly includes a conveying / kneading means 1 provided in a casing 12.
4 and humidifying means 16 for humidifying the combustion ash conveyed in the casing 12. The casing 12 has a top plate 12A formed in a flat plate shape and a bottom portion 12B formed in a curved cylindrical shape, and is installed on a gantry 18 sideways. A supply port 20 for supplying combustion ash into the casing 12 is formed at one upper end of the casing 12, and a discharge port 22 for discharging humidified and kneaded humidified combustion ash from the casing 12 is formed at the lower end of the other end. . A plurality of openings are formed in the top plate 12A of the casing 12 so that the inside of the casing 12 can be seen, and lids 24, 24, 24
Is covered.

The conveying / kneading means 14 includes a front screw conveyor 26 from the supply port 20 side to the discharge port 22 side.
It is mainly composed of a composite conveyor connected to one in the order of the paddle conveyor 28 and the subsequent screw conveyor 30, and a motor 34 for rotatingly driving the rotating shaft 32 of the composite conveyor. One end of the rotating shaft 32 is supported by a bearing 35 via a gland seal 33, and the other end is a gland seal 3.
3. Motor 34 having a built-in speed change function via bearing 35
Linked to A paddle conveyor 28 is arranged between the screw conveyors 26 and 30 to compensate for the shortcomings of the screw conveyor having a large conveying capacity but a small kneading capacity and a paddle conveyor having a large kneading capacity but a small conveying capacity, and a predetermined conveying capacity and kneading. The ability was secured.

The screw conveyors 26 and 30 have a general structure in which a screw blade 36 is fixed to a rotating shaft 32. On the other hand, as shown in FIG. 2, the paddle conveyor 28 has, for example, three paddle blades 40A to 48A, 40A to 40A.
48A, propellers 40-4 composed of 40A-48A
8 are arranged at a predetermined pitch (P) in the axial direction of the rotating shaft 32, and the propellers 40 to 48 are formed by cutting out the original shape of the screw blade to form three paddle blades 40A, 40A, 40A. . In addition, the paddle blades of the adjacent propellers 40 to 48 partially overlap each other when viewed from the axial direction of the rotary shaft 32 as shown in FIG. 3 (a diagram viewed from the right side of the paddle conveyor) (the hatched portion in FIG. 3). ). That is, the propeller 40 located on the drawing front side of FIG.
Of three paddle blades 40A, 40A, 40A
Are disposed at angular positions of 0 °, 90 °, and 225 °, and constitute a propeller 41 located second from the drawing table side.
The paddle blades 41A, 41A, 41A are 45 °, 18
It is arranged at the positions of 0 ° and 315 °. The three paddle blades 42A, 42A, 42A constituting the propeller 42 located third from the drawing table side are 135 °, 270 °.
° and 0 °. Similarly, propeller 4
The three paddle blades 3 to 48 are also arranged such that the paddle blades of the adjacent propellers partially overlap. When the overlap between the paddle blades increases, the humidified combustion ash easily adheres to the paddle blades, and when the overlap decreases, the transfer capability of the combustion ash decreases. Therefore, the overlap between the paddle blades is determined by the overlapping angle in FIG. (Θ) is 15 ° to 3
About 0 ° is appropriate, and preferably 20 ° to 25 °. By forming the paddle conveyor 28 in the above-described structure, the kneading ability of the paddle conveyor can be maintained and the transfer capacity can be improved. Therefore, the portions of the screw conveyors 26 and 30 to which the humidified combustion ash easily adheres are shortened, A humidifying and kneading machine mainly composed of the paddle conveyor 28 having a longer paddle conveyor 28 can be configured. As shown in FIG. 1, the humidifying means 16 includes a plurality of spray pipes with nozzles 50, 50, 50 provided above the screw conveyor 26 in the front stage in the casing 12, and a plurality of spray pipes provided above the paddle conveyor 28. .. And a water supply device 55 for supplying water to each of the spray pipes 50, 52 via a pipe 54. The spray pipes 50, 52 each have a spray / spray. Valves 56 for stopping and adjusting the spray amount are provided. The spray pipes 50 and 52 with nozzles are
As shown in FIG. 5, there are two types: one that sprays downward from the nozzle 58, and one that sprays from the nozzle 58 toward the side wall surface inside the casing 12 as shown in FIG. 6. The two types of spray pipes with nozzles 50 and 52 are alternately arranged along the axial direction of the rotating shaft 32. Further, the spray pipes 50 and 52 with nozzles are provided with a timer mechanism (not shown) so as to perform intermittent spraying.

Further, as shown in FIG.
A first partition plate 60 is provided in the supply port 20 in the vertical direction up to the vicinity of the front screw conveyor 26, and the combustion ash supplied from the supply port 20 into the casing 12 is supplied to the first screw conveyor 60 by the first baffle plate 60. 26. Further, the second baffle plate 6 is also provided at the boundary between the screw conveyor 26 and the paddle conveyor 28 in the vertical direction.
2 are provided (see FIG. 4).

Also, as shown in FIG.
Nozzle 3 facing the inside of casing 12 at supply port 20 of
8 is provided, and the compressor 3 is
1 connected. The air opening / closing valve 29 is connected to a timer mechanism (not shown) of the spray pipes 50 and 52,
The spray pipes 50 and 52 are opened in conjunction with the intermittent spray.

Next, the operation of the humidifying kneader configured as described above will be described. The powdered combustion ash (having an apparent specific gravity of about 0.1) is supplied from the supply port 20 into the casing 12 at a constant supply amount. Usually, the supply amount at this time is supplied to be smaller than the transport capacity of the humidifying kneader 10. The combustion ash supplied into the casing 12 is guided by the first baffle plate 60, falls, is taken into the front screw conveyor 26, and is conveyed in a state of being compacted by the resistance action of the first baffle plate 60. You. Front screw conveyor 26
Of the combustion ash conveyed in the screw conveyor is filled with the combustion ash in the screw conveyor due to the resistance effect of the second baffle plate 62 provided at the boundary position between the preceding screw conveyor 26 and the paddle conveyor 28, and is compacted. . The condensed combustion ash is sent from the first screw conveyor 26 to the paddle conveyor 28 at a fixed layer height equal to the height of the second baffle plate 62.

Next, the combustion ash sent to the paddle conveyor 28 is kneaded while spraying water from a spray pipe 52 with nozzles, so-called humidification kneading is performed. The humidification rate for the combustion ash (weight of added water / weight of added water + weight of combustion ash) was set to be about 25%. At this time, intermittent spraying is performed from the spray pipe 52 with nozzles, for example, spraying for 1 second and stopping spraying for 3 seconds. Pressurized air is sprayed from the air nozzle 38 in conjunction with the intermittent spraying. Thereby, the pressurized air from the air nozzle 38 pressurizes the combustion ash in the casing 12 from the supply port side, thereby humidifying the combustion ash to reduce the volume, thereby filling a marginal portion of the transport capacity, and transporting the ash. The efficiency is increased, and the transfer capacity of the humidifying kneader 10 is increased. That is, when trying to increase the throughput of the humidifying kneader 10 without the air nozzle 38,
It is necessary to increase the diameter, pitch, and number of rotations of the screw blades 36 of the screw conveyors 26 and 30 constituting the transfer unit, and the humidifying kneader 10 becomes large.

Thus, the humidified and kneaded humidified combustion ash is granulated (average particle size of about 7 mm) and reduced in volume to about 1/5 of the volume of the powdered combustion ash before being humidified. . By the way, the first screw conveyor 26, paddle conveyor 2
8. When the rear screw conveyor 30 is arranged, if the paddle conveyor is a normal paddle conveyor having a small conveying capacity, it is general to humidify the front screw conveyor 26, but the humidified combustion ash is added to the front screw conveyor 26. There is a problem that it easily adheres. Therefore, in the present embodiment, the humidification is performed by the paddle conveyor 28 to which the humidified combustion ash is less likely to adhere as compared with the screw conveyor 26. Is large, paddle conveyor 2
This is because the humidified combustion ash can be prevented from staying in the paddle conveyor 28 even if the length 8 is lengthened, so that the transport distance for spraying can be secured.

Next, the humidified combustion ash humidified and kneaded in the paddle conveyor 28 is sent out from the paddle conveyor 28 to the subsequent screw conveyor 30 and discharged from the outlet 22. As described above, according to the humidifying kneader of the present invention, it is possible to equalize the humidification amount of water with respect to the combustion ash per unit amount while keeping the conveyance amount of the combustion ash, and to prevent the occurrence of uneven humidification. Since the humidification and kneading can be performed, the humidification accuracy is improved, and the humidified and kneaded humidified combustion ash hardly adheres in the casing.

Further, since the humidified and kneaded humidified combustion ash hardly adheres to the inside of the casing, a long-time continuous operation is possible. Further, since the air nozzle 38 is provided to increase the transfer power of the humidifier, the transfer capacity does not decrease even if the humidifier is made compact. Also, humidification was performed in the area of the paddle conveyor 28, but the screw conveyor 26 in the first stage was humidified.
When the second baffle plate 62 is provided, a fixed amount of humidified combustion ash can be sent out to the paddle conveyor, so that the humidification accuracy is improved.

In this embodiment, the humidification and kneading of combustion ash produced by burning a fuel obtained by emulsifying a super heavy oil such as orinoco tar is described. The present invention is also applicable to humidifying and kneading not only combustion ash but also highly adhesive tacky substances. In the present embodiment, two types of spray pipes with nozzles are alternately arranged, but the present invention is not limited to this arrangement, and can be changed as appropriate according to the interval between the spray pipes with nozzles, the spray amount, and the like.

[0026]

As described above, according to the humidifying kneader according to the present invention, the amount of combustion ash per unit amount of water can be equalized while keeping the amount of combustion ash conveyed constant. In addition, humidifying and kneading can be performed so that uneven humidification does not occur. Thereby, the humidification accuracy can be improved, and the humidified and kneaded humidified combustion ash can be hardly adhered in the casing.

Therefore, like combustion ash generated by burning fuel emulsified with super heavy oil such as orinoco tar,
It is extremely effective as a humidifier and kneader for combustion ash, which has a property of being easily adhered and solidified to blades, rotating shafts and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of a humidifying kneader according to the present invention.

FIG. 2 is a perspective view illustrating the structure of a paddle conveyor.

FIG. 3 is a view seen from the right side of FIG. 2 and is an explanatory diagram illustrating the arrangement of paddle blades of a paddle conveyor.

FIG. 4 is a sectional view taken along the line AA of FIG. 1;

FIG. 5 is an explanatory diagram for explaining downward spraying by a spray pipe with a nozzle.

FIG. 6 is an explanatory view for explaining spraying toward a casing side wall surface by a spray pipe with a nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Humidifying kneader 12 ... Casing 14 ... Conveying and kneading means 16 ... Humidifying means 20 ... Supply port 22 ... Discharge port 26 ... Front screw conveyor 28 ... Paddle conveyor 30 ... Rear screw conveyor 32 ... Rotating shaft 34 ... Motor 38 ... Air nozzle 40-48 ... Propeller of paddle conveyor 40A-48A ... Paddle blade 50, 52 ... Spray pipe with nozzle 60 ... First baffle plate 62 ... Second baffle plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kozo Handa 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Company (72) Inventor Seiji Hikichi 1-1-1 Uchikanda, Chiyoda-ku, Tokyo No. Hitachi Plant Construction Co., Ltd. (72) Inventor Kazunori Morita 1-1-14 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (72) Toshimasa Ushizawa 1-1-1, Uchikanda, Chiyoda-ku, Tokyo No. 14 Inside Hitachi Plant Construction Co., Ltd. (72) Inventor Sadao Sakakibara 1-1-14 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Plant Construction Co., Ltd. (56) References JP-A-7-88459 (JP, A) 7-256074 (JP, A) JP 58-166829 (JP, U) JP 2-5136 (JP, B2) JP 37-17443 (JP, B1) Sho 3 6-25563 (JP, Y1) Jikken 48-41247 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01F 3/00-3/22 B01F 7/00-7 / 32 B01J 2/10 B09B 3/00

Claims (2)

(57) [Claims] 1. A humidifying and kneading machine for humidifying and kneading powdery combustion ash produced by burning heavy oil in which super heavy oil is emulsified, wherein said humidifying and kneading machine has a supply port for said combustion ash at one end and the other end. A cylindrical casing having a discharge port for humidified combustion ash that has been humidified and kneaded, and a screw conveyor that is rotatably provided in the casing and has a screw blade fixed to a transport shaft as a rotating shaft, and a plurality of kneading units. A paddle conveyor in which propellers having blades are arranged and fixed at predetermined intervals on the rotating shaft, and the paddle blades of the propeller
The original shape of the wings is cut out and created before being adjacent
The paddle blades of the propeller are arranged in the axial direction of the rotation shaft.
One composite conveyor arranged so as to partially overlap with each other, a rotary power source for rotating the rotating shaft, a spray nozzle for spraying water to combustion ash conveyed in the casing by the composite conveyor, The composite conveyor is arranged in order from the supply port side of the casing,
Screw conveyor, paddle conveyor, rear screw
-Conveyor and inside the casing
Boundary between screw conveyor and paddle conveyor
Above the position, substantially perpendicular to the direction of transport of the combustion ash
A humidifying kneader characterized by having a baffle plate . 2. A humidifying and kneading machine for humidifying and kneading powdery combustion ash produced by burning heavy oil obtained by emulsifying super heavy oil, comprising a combustion ash supply port at one end and another end. A cylindrical casing having a discharge port for humidified combustion ash that has been humidified and kneaded, and a screw conveyor that is rotatably provided in the casing and has a screw blade fixed to a transport shaft as a rotating shaft, and a plurality of kneading units. A paddle conveyor in which propellers having blades are arranged and fixed at predetermined intervals on the rotating shaft, and the paddle blades of the propeller
C to co When you create by cutting the original shape of the wings, adjacent before
The paddle blades of the propeller are arranged in the axial direction of the rotation shaft.
One composite conveyor arranged so as to partially overlap with each other, a rotary power source for rotating the rotating shaft, a spray nozzle for spraying water to combustion ash conveyed in the casing by the composite conveyor, A plurality of spray nozzles, and a plurality of spray nozzles.
The nozzle is a nozzle that sprays in the lateral direction inside the casing and the nozzle
And a nozzle that sprays in the direction of the rotation axis of the composite conveyor.
Humidifier kneader, characterized in that it is.