JP4173025B2 - Dust supply device and fluidized bed furnace system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust supply device that supplies garbage to a fluidized bed furnace and a fluidized bed furnace system including the dust supply device.
[0002]
[Prior art]
For example, as shown in FIG. 6, the conventional dust supply device includes a waste hopper 1, a vertical pipe 2 in which the lower part of the waste hopper 1 is connected to the upper part thereof, and a front pusher installed at the lower part of the pipe 2. 3 and an intermediate receiving tank 4 connected to the lower side of the pipe 2 in the horizontal push-in direction of the front pusher 3, and an upper receiving end connected to the lower part of the intermediate receiving tank 4. The screw part 5, the cutoff damper part 7 whose side part of the upper end is connected to the horizontal end part of the screw part 5 away from the intermediate receiving tank 4, and the lower part and the upper part of the cutoff damper part 7 are connected to each other. The supplied feeder unit 8 is provided.
[0003]
Garbage received by the garbage hopper 1 passes through the pipe 2 and accumulates on the upper part of the front pusher 3. The accumulated dust is intermittently pushed out in the horizontal direction by the front pusher 3 and sent to the intermediate receiving tank 4. Garbage sent to the intermediate receiving tank 4 is stored there. The stored waste is conveyed to the blocking damper portion 7 by the screw 5 a of the screw portion 5. Here, the rotational speed of the screw 5a is adjusted by the screw driver 6 so that the amount of the carried-out garbage becomes quantitative. Garbage that has passed through the shut-off damper unit 7 is pushed out by the supply feeder 8a of the supply feeder unit 8 and supplied to a waste incinerator (not shown). In the dust supply device, the waste is temporarily stored in the intermediate receiving tank 4 so that the waste blocks the flow of air from the waste hopper 1 to the incinerator.
[0004]
Moreover, in the conventional dust supply apparatus, the side wall of the screw part 5 is a moving wall, and a dust removal device is provided at the screw part outlet to quantitatively supply dust. (For example, refer to Japanese Examined Patent Publication No. 1-56331) Further, a pulverizing and discharging machine that can move to the outlet of the screw portion is provided, and the distance between the outlet and the pulverizing and discharging machine is measured and adjusted, thereby allowing garbage It was set as the structure which supplies stably. (For example, see Japanese Patent Publication No. 11-287423)
[0005]
[Patent Document 1]
Japanese Patent Publication No. 1-56331 (page 3-4, Fig. 1-2)
[Patent Document 2]
Japanese Examined Patent Publication No. 11-287423 (page 3, Fig. 1, Fig. 3-5)
[0006]
[Problems to be solved by the invention]
However, in the conventional dust supply device, when a large amount of waste, particularly crushed waste, is stored in the intermediate receiving tank 4, the dust is consolidated and hardened to form a bridge, and the fall of the dust onto the screw portion 5 is suppressed. As a result, there is a problem that the supply of garbage cannot be performed stably. In addition, a large number of space layers are formed due to the bridge, and there is a problem that the air flow from the waste hopper 1 to the fluidized bed furnace is not blocked. In particular, it is essential to ensure sealing performance in a fluidized bed gasification furnace for gasification purposes, so such a problem must be avoided. Alternatively, when the amount of waste stored in the intermediate receiving tank 4 is small, there is a case where the supply of the waste to the fluidized bed furnace may not be performed continuously, and the operation efficiency of the fluidized bed furnace is reduced.
[0007]
Then, this invention is providing the dust supply apparatus with which waste is supplied quantitatively to a fluidized bed furnace and the flow of the air from a refuse hopper to a fluidized bed furnace is interrupted | blocked effectively.
[Means for Solving the Problems]
[0008]
In order to achieve the above object, a dust supply device according to a first aspect of the present invention includes, for example, as shown in FIG. 1, a garbage hopper 11 that receives garbage; and the garbage received by the garbage hopper 11 downward in the vertical direction. Means 14 for quantitatively transporting; storage unit 15 for storing the waste transported by means 14 for quantitatively transporting downward in the vertical direction; and quantitatively supplying the waste stored in the storage unit 15 to the outside And a fixed quantity supply means 16.
[0009]
With this configuration, the dust received by the waste hopper is quantitatively conveyed downward in the vertical direction by means for quantitatively conveying downward in the vertical direction. Shut off. Further, the transported garbage accumulates in the storage part, and blocks the flow of air from the waste hopper to the fluidized bed furnace. Further, since the dust accumulated in the storage unit is supplied to the outside by the quantitative supply means, the supply of the waste is continuously performed.
[0010]
further , Claims 1 The dust supply device according to the invention of , Example For example, as shown in FIG. 1, a vertical screw portion 14 is provided as means for quantitatively transporting downward in the vertical direction.
[0011]
If comprised in this way, refuse will be conveyed quantitatively downward by the vertical screw part, and the vertical screw part has the effect which interrupts | blocks the flow of the air from a refuse hopper to a fluidized bed furnace.
[0012]
further , Claims 1 In the dust supply apparatus according to the invention, for example, as shown in the schematic cross-sectional view of FIG. 2, the vertical screw portion has a vertical screw 14 a that moves around by rotating around the axis; A level detection device 21 for detecting the level of dust stored in the unit 15; and a vertical screw rotation speed control device 23 for controlling the rotation speed of the vertical screw according to a signal from the level detection device 21.
[0013]
If comprised in this way, according to the quantity of the waste currently stored in the storage part, the rotational speed of a vertical screw will be changed and the quantity of the waste conveyed to a storage part will be adjusted.
[0014]
In order to achieve the object, the claims 2 In the dust supply apparatus according to the invention, for example, as shown in FIG. 1, the fixed amount supply means includes a scraper casing 16 e that receives the dust stored in the storage portion 15; The scraper 16 includes a moving shaft scraping screw 16a that rotates about a moving shaft 16c that moves in the horizontal direction.
[0015]
If comprised in this way, since the waste currently stored in the storage part is scraped off with a scraper and it supplies to the exterior, waste can be supplied reliably.
[0016]
In order to achieve the object, the claims 3 In the dust supply apparatus according to the invention, for example, as shown in FIG. 1, the fixed supply scraping screw 16 b that rotates around the fixed shaft 16 d that does not move positionally with respect to the scraper casing 16 e. It is the scraper 16 which has further.
[0017]
If comprised in this way, since the waste currently stored in the storage part is scraped off with two scraping screws, it can supply more reliably.
[0018]
In order to achieve the object, the claims 4 For example, as shown in FIG. 3, the dust supply device according to the invention includes an electric motor 45 a that drives the scraper, and means 31, 32 that controls movement of the moving shaft 16 c based on a current value signal of the electric motor. 33, 34, and 35 are provided.
[0019]
If comprised in this way, the position of a movement axis | shaft can be controlled by the electric current value signal of the electric motor of a scraping machine, and the dust pinched | interposed in the said scraping screw can be removed, Therefore A dust can be supplied stably. Can do.
[0020]
In order to achieve the object, the claims 5 For example, as shown in FIG. 4, the dust supply apparatus according to the invention includes means 51, 52, 53, and 54 for controlling the rotational speed of the moving shaft 16c in response to a request signal from the fluidized bed furnace.
[0021]
With this configuration, the rotational speed of the moving shaft scraping screw is controlled by a request signal from the fluidized bed furnace to scrape and adjust the amount to be supplied, so that it is suitable for combustion in the fluidized bed furnace. Can supply garbage.
[0022]
Claim 6 The fluidized bed furnace system according to the present invention is, for example, as shown in FIG. 5 The dust supply apparatus of any one of these; and the fluidized-bed furnace which receives the supply of refuse from the said dust supply apparatus.
[0023]
If comprised in this way, refuse will be supplied quantitatively to a fluidized bed furnace, the flow of the air from a refuse hopper to a fluidized bed furnace will be interrupted | blocked, and the operating efficiency of a fluidized bed furnace will become high.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0025]
With reference to the cross-sectional view of FIG. 1, a dust supply apparatus according to a first embodiment of the present invention will be described.
[0026]
The garbage hopper 11 that receives garbage conveyed by a garbage collection truck or the like has a funnel-shaped garbage receiving portion that opens upward and has a funnel-like waste receiving portion. A waste outlet is opened in the sunk portion. A breaker 11a that breaks the bridge when the dust is consolidated in the waste hopper and hardens to form a bridge is attached to the waste discharge port. In addition, the breaker 11a is also used to block the inflow of air and suppress the fire when a fire occurs in the dust in the dust supply device. Further, a pipe 12 that guides the dust vertically downward is connected to the dust discharge port.
[0027]
First, the waste is conveyed to the waste hopper 11, and the waste received by the waste hopper is dropped into the pipe 12.
[0028]
The lower part of the pipe 12 is closed in a plane, and a pusher 13 is installed on the plane. The pusher 13 has a cylinder for pushing dust and moves the cylinder back and forth in the horizontal direction by a hydraulic device.
[0029]
The dust falling on the pipe 12 is deposited on the flat surface and the pusher 13. The pusher 13 intermittently pushes out the accumulated dust in the horizontal direction by moving the cylinder in the horizontal direction.
[0030]
The lower side surface of the tube 12 is opened in the pusher pushing direction, and an inclined chute 13a is connected to the opening. The inclined chute 13a is a tube having an inclination that falls in the direction of the waste flow path, and has a rectangular cross section. The other end of the inclined chute 13 a is connected to the vertical screw part 14. The inclined chute only needs to drop the dust onto the vertical screw portion by inclination, and the cross-sectional shape does not have to be rectangular.
[0031]
The dust pushed out in the horizontal direction by the pusher 13 enters the vertical screw portion 14 through the inclined chute 13a.
[0032]
By providing the pipe 12 and the pusher 13, the dust accumulated in the lower part of the pipe 12 blocks the flow of air from the waste hopper to the fluidized bed furnace, and reliably forms the waste from the waste hopper 11 vertically. Although it can send to the screw part 14, it is good also as a structure which puts garbage directly in the vertical screw part 14 from the garbage hopper 11 by an inclination chute, for example.
[0033]
The vertical screw portion 14 has a coaxial vertical screw 14a in a cylindrical vertical screw casing 14b whose axis is the vertical direction. The vertical screw 14a has a spiral projection plate 14d on a cylindrical surface, and the outer edge of the spiral projection plate 14d is close to the inner wall of the vertical screw casing 14b. The vertical screw 14a is rotated about the vertical axis by a vertical screw driver 14c installed on the upper part of the vertical screw casing 14b.
[0034]
In addition, when calling it a perpendicular direction here, the axis | shaft of the vertical screw part 14 may incline 45 degree | times from the exact | strict vertical direction. However, it is preferable that it is substantially directed in the vertical direction, and the substantially vertical direction means that the inclination from the strict vertical direction is within 10 degrees, more preferably within 5 degrees.
[0035]
With the rotation of the vertical screw 14a, the dust that has entered the vertical screw portion is moved downward as the helical projection plate 14d rotates in a spiral downward direction. Therefore, by changing the rotational speed of the vertical screw 14a, the speed at which the vertical screw 14a moves the waste changes, so that the amount of waste transport can be controlled, and the waste is quantitatively transported. . Further, the dust spreads in the circumferential direction of the spiral projection plate 14d of the vertical screw by the rotation of the vertical screw 14a. Then, the gap between the inner wall of the vertical screw casing 14b and the spiral projection plate 14d is filled with garbage, and the vertical screw portion 14 blocks the flow of air from the garbage hopper 11 to the fluidized bed furnace. Note that the vertical screw may not be used as the means for quantitatively transporting downward in the vertical direction.
[0036]
A storage unit 15, which is a space surrounded by a wall, that receives the waste conveyed from the vertical screw unit 14 is installed below the vertical screw unit 14. The storage unit 15 has a sufficient capacity with respect to the amount of waste to be stored.
[0037]
Garbage conveyed by the vertical screw unit 14 is discharged to the storage unit 15 where it is stored. In the storage unit 15, the stored garbage spreads by discharging from the vertical screw unit 14, and when a sufficient amount of waste is stored in the storage unit 15, the waste is stored in the waste flow path in the storage unit space. Covers a vertical surface. By covering the surface perpendicular to the waste flow path in the storage space, the flow of air from the waste hopper 11 to the fluidized bed furnace can be blocked. The amount of waste stored in the storage unit 15 is adjusted by changing the amount of waste discharged from the vertical screw unit 14 to the storage unit. When the amount of waste stored is the amount in regular operation, there is a margin space above the waste. Since there is a marginal space, the difference between the quantitative conveyance amount by the vertical screw unit 14 and the quantitative supply amount by the scraper 16 can be absorbed here.
[0038]
A scraper 16 is installed in the lower part of the storage unit 15. The scraper 16 includes a scraper casing 16e that is connected to the storage unit 15 and receives garbage stored in the storage unit, and two scraping screws 16a and 16b. In the scraping screw, a flat plate is bent into a chevron shape, and a plurality of claws are attached to a cylindrical surface on a horizontal axis for scraping out dust that becomes higher at the center and lowers toward both ends. The scraping screws 16a and 16b can surely scrape the dust stored in the storage unit 15 because the nail bites into the dust and scratches the dust.
[0039]
As the scraping screw rotates about the central axis, the claw scrapes off the dust stored in the storage unit 15. The shape of the claw may be other than the above, for example, a plurality of flat plates may be fixed on the cylindrical surface in a direction parallel to the axis, or a plurality of round bars may be fixed on the cylindrical surface. You may do it.
[0040]
In the scraper 16, the two scraping screws 16a and 16b rotate in the opposite direction so as to feed the dust in the upper part between the screws from the top to the bottom. Scrap out and feed downward.
[0041]
The moving shaft scraping screw 16a of one of the two scraping screws is fixed to the moving shaft 16c so that the shaft 16c can move in the scraper casing 16e horizontally and vertically to the central axis. It is configured. The fixed shaft scraping screw 16b is fixed to the fixed shaft 16d, and the fixed shaft is fixed so that the position does not move in the scraper casing 16e. As will be described later, the scraper 16 can remove dust sandwiched between the two scraping screws by changing the interval between the two scraping screws.
[0042]
Since the scraper 16 has two scraping screws, the scrap stored in the storage unit 15 can be reliably scraped from a wide range. However, the scraper 16 of the scraper 16 may be one. When the number of the scraping screws is one, the scraper can be made small and the cost can be reduced. Garbage supplied by the scraper 16 falls off the shut-off damper portion 17 having a function of forcibly stopping dust supply, and is supplied to the fluidized bed furnace.
[0043]
Next, the configuration of the screw portion 14 will be described in more detail with reference to the schematic cross-sectional view of FIG. When the amount of waste stored in the storage unit 15 is reduced, the waste does not cover the surface perpendicular to the waste flow path in the storage unit space, and the flow of air from the waste hopper to the fluidized bed furnace cannot be blocked. . Alternatively, the scraping scrap is reduced, and the scraper 16 cannot supply the scrap quantitatively.
[0044]
Therefore, the storage unit 15 is provided with an ultrasonic level meter 21 for detecting the amount of stored waste, that is, the level of waste. As an apparatus for detecting the level of dust, an optical sensor, a limit switch, or a piezoelectric sensor may be used instead of the ultrasonic level meter. The signal from the ultrasonic level meter 21 is transmitted to the vertical screw rotation speed control device 23 through the level signal transmission cable 22.
[0045]
In the vertical screw rotation speed control device 23, if the dust level of the storage unit 15 is lower than the specified value, the rotation speed of the vertical screw 14a is increased, the amount of dust supplied by the vertical screw unit 14 is increased, and the reverse In addition, if the dust level in the storage unit 15 is too high, the rotational speed of the vertical screw 14a is determined so as to slow down the rotational speed of the vertical screw 14a and reduce the amount of dust supplied by the vertical screw part 14. . The rotational speed is transmitted to the vertical screw driver 14c through the rotational speed transmission signal cable 24, and the vertical screw driver 14c rotates the vertical screw 14a at the transmitted rotational speed. Therefore, the vertical screw 14a supplies an appropriate amount of garbage.
[0046]
Next, the configuration of the scraper 16 will be described in detail with reference to the schematic cross-sectional view of FIG. In order to operate the fluidized bed furnace efficiently, it is preferable that an appropriate amount of garbage is stably supplied. The amount of waste supplied to the fluidized bed furnace is the amount that the scraping screw scrapes out the waste and supplies it to the lower part.
[0047]
First, the movement of the moving shaft will be described with reference to a schematic cross-sectional view around the moving shaft scraping screw in FIG.
[0048]
An ammeter 31 for detecting a current value supplied to the electric motor 45a is installed on a power line connecting the electric motor 45a for driving the scraper and the power source 51. The current value detected by the ammeter 31 is transmitted to the movement control device 33 of the movement axis through the current value signal transmission cable 32. A signal from the movement control device 33 is transmitted to the actuator 35 through the movement axis movement signal cable 34.
[0049]
When foreign matter is mixed into the dust between the two scraping screws 16a and 16b and the dust is caught, rotation of the scraping screw is hindered, and a load for rotating the scraping screw increases. That is, the current value of the electric motor 45a for driving the scraper (the current value detected by the ammeter 31) increases. The current value is transmitted to the movement control device 33 through the current value signal transmission cable 32. In the movement control device 33, when the current value exceeds a preset current value, the position of the moving shaft scraping screw 16a is moved away from the fixed shaft scraping screw 16b, and the scraping screws 16a and 16b are moved. A signal is sent to widen the waste flow path 39 between the two. The signal is transmitted to the actuator 35 through the movement axis movement signal cable 34, and the actuator 35 moves the position of the movement axis.
[0050]
The moving shaft cleaning screw 16a moves away from the fixed shaft cleaning screw 16b, and the waste flow path 39 between the two cleaning screws 16a and 16b widens, so that the space between the cleaning screws 16a and 16b is increased. Garbage sandwiched between the two will not be pinched and will fall to the bottom.
[0051]
In the movement control device 33, when it is confirmed that the current value signal is stable at a value lower than the preset current value after a predetermined time, the position of the movement axis is set in a preset normal operation. Send a signal to move to a position. The signal is transmitted to the actuator 35 through the movement axis movement signal cable 34, and the actuator 35 moves the movement axis to the position in the normal operation.
[0052]
With reference to an enlarged view of the bearing portion in FIG. 3B, a configuration in which the moving shaft is moved by the actuator will be described. A bearing 37 of the moving shaft 16 c is supported by a bearing casing 36. The bearing casing 36 is configured to be horizontally movable in the vertical direction with respect to the central axis on a scraping screw cradle 38 fixed to the scraper casing 16e. When the actuator 35 moves the bearing casing 36 in the horizontal direction, the moving shaft 16c moves in conjunction with the movement of the bearing 37. Since the moving shaft scraping screw 16a is fixed to the moving shaft 16c, it moves as the moving shaft 16c moves.
[0053]
FIG. 3B shows only one bearing, but at least two bearings are necessary on both sides of the scraping screw, and both bearings are movable on the screw cradle 38. Supported by the casing, all the bearing casings move in the same way. Therefore, there may be two or more actuators, or all the bearing casings may be moved by one actuator.
[0054]
The movement axis may be moved by a configuration other than the above description. For example, the electric motor that drives the scraper is also fixed to the scraper frame, and the scraper frame can be moved horizontally and perpendicular to the central axis on the scraper casing. The actuator may move all of the scraper frame, the bearing casing supported by the scraper frame, the moving shaft, the moving shaft scraping screw, and the electric motor in the horizontal direction. In this case, a larger force is required to move the scraper frame, but since the distance between the motor and the moving shaft is constant, the transmission of force from the motor to the moving shaft is stable, Further, a larger movement is possible.
[0055]
In addition, without having the fixed shaft cleaning screw 16b, the moving shaft cleaning screw 16a is opposed to the inner wall of the scraper casing 16e, thereby forming a flow path for transporting garbage, and the moving shaft cleaning screw 16a. It is good also as a structure which expands the width | variety of the flow path of garbage by movement of.
[0056]
Next, adjustment of the rotational speed of the scraping screw will be described with reference to a schematic front view showing the moving shaft scraping screw and its surroundings in FIG.
[0057]
The amount of garbage supplied from the dust feeder to the fluidized bed furnace is the amount of waste supplied by the scraper. The amount of dust supplied by the scraper is an amount that the scraping screw scrapes out the dust in the storage part and supplies it to the lower part. Therefore, by changing the rotation speed of the scraping screw, the amount of dust supplied from the dust supply device to the fluidized bed furnace can be adjusted.
[0058]
Here, the adjustment of the amount of dust supplied from the dust supply device to the fluidized bed furnace will be described. A fluidized bed furnace (not shown) is generally operated so as to burn an amount of garbage corresponding to a planned amount. However, when the operation state becomes inappropriate, for example, not only the supply amount of combustion air but also the supply amount of waste is adjusted to maintain an appropriate operation state. Here, the appropriate operation state is typically an operation state that is efficient as a fluidized bed furnace, and is an operation state in which components such as flammable gas and exhaust gas from the furnace and emission amount are appropriate. The fluidized bed furnace is provided with an operation control device for maintaining the operation state. The operation control device grasps the operation state from measurement of various parameters such as the hearth temperature, the furnace top temperature, and the oxygen concentration, and outputs various control signals for maintaining an appropriate operation state. A request signal for requesting an appropriate amount of waste is sent from the operation control device to the dust supply device.
[0059]
The request signal from the operation control device is transmitted to the rotation speed control device 53 through the request signal transmission cable 52. Based on the request signal, the rotation speed control device 53 sends a signal for adjusting the rotation speed of the moving shaft 16c so as to obtain an appropriate amount of dust supply. The signal is transmitted to the power source 51 through the rotational speed signal transmission cable 54, and the voltage of the electric power supplied from the power source to the electric motor 45a is changed. Therefore, the rotational speed of the electric motor 45a is changed.
[0060]
The rotation of the electric motor 45 a is transmitted from the electric motor pulley 43 to the moving shaft pulley 42 via the belt 44. Since the moving shaft scraping screw 16a and the moving shaft pulley 42 rotate in the same manner via the moving shaft 16c supported by the bearing 37, the rotation of the moving shaft scraping screw 16a is caused by a change in the rotation speed of the electric motor. The speed changes. For example, when increasing the amount of waste supply, the voltage of the power source 51 is increased so that the current value of the ammeter 31 increases. Then, the current to the electric motor 45a increases, the rotational speed of the moving shaft scraping screw 16a increases, scrapes more dust, and increases the amount of dust supply.
[0061]
In the above embodiment, it has been described that the force from the electric motor 45a to the moving shaft is transmitted via the belt and the pulley, but may be transmitted by other methods. For example, it may be transmitted via a chain and a sprocket, or may be transmitted via a gear. Transmission through the belt and pulley is simpler and less expensive, but transmission through the chain and sprocket or gear can transmit a larger force. As described above, when only the moving shaft is moved without moving the electric motor, the distance between the two changes, so that the structure is complicated particularly in the method of transmitting via the chain and sprocket or gear.
[0062]
The rotational speed of the fixed shaft cleaning screw 16b is synchronized with the rotational speed of the moving shaft cleaning screw 16a by a synchronization chain or a synchronous gear (not shown). When the rotation speeds of the two scraping screws are synchronized, the dust stored in the storage unit 15 is scraped out evenly, and the frictional force generated by the difference in the moving speed of the dust between the scraping screws is generated. No extra force is required to rotate the scraping screw. The rotational speed of the fixed shaft scraping screw 16b may be adjusted in the same manner as described above. Alternatively, in order to simplify the structure, only the rotational speed of the moving shaft scraping screw 16a or only the rotational speed of the fixed shaft scraping screw 16b may be adjusted.
[0063]
According to the first embodiment of the present invention, the number of devices constituting the dust supply device is reduced as compared with the conventional dust supply device. As a result, the number of flanges connecting the devices is reduced, air leakage from the inside of the dust supply device through the flange surface to the outside is reduced, and waste odor leakage can be prevented. In addition, maintenance is facilitated, and further, the dust supply cost can be reduced by reducing the number of devices, and the operating cost can be reduced. Further, the installation area can be reduced by reducing the number of devices and adopting the vertical screw portion.
[0064]
Next, a fluidized bed furnace system according to a second embodiment of the present invention will be described with reference to the schematic cross-sectional view of FIG. In the fluidized bed furnace 19, a fluidized bed of dredged sand c is formed on the air dispersion plate 19 a provided at the furnace bottom in the fluidized bed furnace 19 by the combustion air b fed into the furnace bottom. By falling into the fluidized bed of cinnabar held at a temperature of 450 to 650 ° C., the waste is quickly pyrolyzed and gasified in contact with the heated cinnabar c and the combustion air b, and thus gas, tar, solid It becomes carbon.
[0065]
Solid carbon is pulverized by the active disturbing motion of the fluidized bed. Combustion air b is also blown into the free board 19b formed in the fluidized bed furnace 19, and tar and solid carbon are gasified at a high temperature of 650 to 850 ° C. The product gas exiting the fluidized bed furnace 19 accompanied by the refined solid carbon is supplied to a swirling melting furnace (not shown) and mixed with preheated combustion air b in a swirling flow, at 1200 to 1500 ° C. High-speed combustion at high temperatures. At the bottom of the furnace, the cinnabar c and the incombustible material d are discharged by the incombustible material discharge device 19c and then classified.
[0066]
In the above gasification furnace, since flammable gas is generated, it is negative pressure to prevent leakage of flammable gas to the outside, and when the generated gas contains a large amount of impure gas such as air. It is necessary to maintain a negative pressure such as gas burning. For this purpose, the dust supply device according to the first embodiment of the present invention is preferable because it effectively blocks the flow of air from the waste hopper to the gasifier.
[0067]
Typically, the fluidized bed furnace 19 includes a fluidized bed gasification furnace used in the above gasification and melting apparatus, a gasification chamber and a combustion chamber, and heat generated by burning carbonized residue (char). An integrated gasification furnace that gasifies combustibles in the gasification chamber is used, but other fluidized bed gasification furnaces may be used.
[0068]
The waste supplied to the fluidized bed furnace 19 is first transported to the waste hopper 11, received by the waste hopper 11, and then deposited on the plane of the bottom of the tube and the pusher 13 through the tube 12. Is pushed in the horizontal direction and sent to the vertical screw unit 14. Garbage sent to the vertical screw unit 14 is quantitatively conveyed downward in the vertical direction by the vertical screw unit 14 and stored in the storage unit 15. The stored waste is quantitatively supplied to the cutoff damper unit 17 by the scraper 16, and is supplied from the cutoff damper unit 17 through the inclined chute 18 to the fluidized bed furnace 19. That is, the dust received by the waste hopper is quantitatively conveyed downward in the vertical direction by the vertical screw unit 14, and the conveyed garbage is accumulated in the storage unit 15 and is transferred from the waste hopper to the fluidized bed furnace 19. Block the air flow. In addition, since the dust accumulated in the storage unit 15 passes through the blocking damper unit 17 and the inclined chute 18 and is quantitatively supplied to the fluidized bed furnace 19 by the scraper 16, the fluidized bed furnace 19 Appropriate amount of garbage is continuously supplied. Therefore, the fluidized bed furnace 19 is operated efficiently.
【The invention's effect】
As described above, according to the present invention, waste is quantitatively supplied to the fluidized bed furnace, and the air flow from the waste hopper to the fluidized bed furnace is effectively interrupted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a dust supply device according to a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view illustrating the configuration of a vertical screw part.
FIG. 3 is a schematic cross-sectional view illustrating a configuration of a scraper.
FIG. 4 is a schematic partial front view around a moving shaft scraping screw.
FIG. 5 is a schematic cross-sectional view of a fluidized bed furnace system according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of a conventional dust supply device.
[Explanation of symbols]
1 Garbage hopper
2 pipes
3 Previous pusher
4 Intermediate tank
5 Screw part
5a screw
6 Dust feeder
7 Blocking damper part
8 Supply feeder section
8a Supply feeder
11 Garbage Hopper
11a breaker
12 tubes
13 Pusher
13a Tilting chute
14 Vertical screw
14a Vertical screw
14b Vertical screw casing
14c Vertical screw drive
14d spiral projection plate
15 Reservoir
16 Scraper
16a Movement axis
16b Fixed shaft
16c Moving shaft scraping screw
16d fixed shaft scraping screw
16e scraper casing
17 Blocking damper part
18 Inclined chute
19 Fluidized bed furnace
19a Air dispersion plate
19b free board
19c Incombustible discharge device
21 level detector
22 level signal transmission cable
23 Vertical screw speed controller
24 Rotational speed transmission signal cable
31 Current value detection device
32 Current value signal transmission cable
33 Movement control device
34 Movement axis movement signal cable
35 Actuator
36 Bearing casing
37 bearings
38 scraping screw cradle
39 Garbage channel
42 Moving shaft pulley
43 Electric pulley
44 Belt
45a electric motor
51 power supply
52 Request signal transmission cable
53 Rotational speed control device
54 Rotational speed signal transmission cable
a Garbage
b Combustion air
c Sand
d Incombustible material

Claims (6)

A waste hopper that accepts garbage;
Means for quantitatively conveying the waste received by the waste hopper vertically downward;
A storage section for storing waste transported by means for transporting quantitatively downward in the vertical direction;
A quantitative supply means for quantitatively supplying the waste stored in the storage unit to the outside;
A vertical screw part as a means for quantitatively conveying the vertically downward portion;
The vertical screw part has a vertical screw that moves around by rotating around an axis;
And a level detection device for detecting the level of garbage stored in the storage unit;
A control device for controlling the rotational speed of the vertical screw according to a signal from the level detection device;
Dust supply device. A scraper casing for receiving the waste stored in the storage unit, the quantitative supply means;
A scraper having a moving shaft scraping screw that rotates about a moving shaft that moves in a horizontal direction relative to the scraper casing;
The dust supply device according to claim 1 . The scraper is a scraper further comprising a fixed shaft scraping screw that rotates about a fixed shaft that does not move relative to the scraper casing;
The dust supply device according to claim 2 . An electric motor for driving the scraper;
Means for performing movement control of the moving shaft according to a current value signal of the electric motor;
The dust supply apparatus of Claim 2 or Claim 3 . Means for controlling the rotational speed of the moving shaft of the scraper according to a request signal from a fluidized bed furnace;
The dust supply device according to any one of claims 2 to 4 . A dust supply device according to any one of claims 1 to 5 ;
A fluidized bed furnace for receiving waste from the dust supply device;
Fluidized bed furnace system.

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