JPH0216123Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to an improvement of an intrusion ash discharge device attached to a parallel rocking hollow stoker used, for example, in a municipal waste incinerator. (Conventional technology) In recent years, municipal waste thrown into waste incinerators includes
It includes miscellaneous items such as kitchen waste, paper, plastic, metal, earth and sand. Therefore, parallel oscillating hollow stokers, which can incinerate the municipal waste uniformly and quickly, are now widely used in waste incinerators. This hollow stoker has a structure in which hollow movable rostles and hollow fixed rostles each having a combustion air hole are alternately arranged in parallel, and the hollow movable rostles are swung back and forth by a hydraulic cylinder or the like. However, the parallel oscillating hollow stoker has a problem in that during operation, incinerated ash enters into each roost through the combustion air holes. Therefore, the applicant has developed an intrusion ash discharge device (Japanese Patent Publication No. 53-2268) which solves the above-mentioned problems with the conventional hollow stoker. That is, as shown in FIG. 6, the infiltrated ash discharge device is provided with a cleaning nozzle 21 at the starting end of the hollow rooster 20, a discharge port 22 and a discharge door 23 which can be opened and closed at the rear end, and a side wall. The cleaning nozzle 21 removes the ash that has entered the hollow rostre 20 from the combustion air hole 24 formed in the
The pressure fluid injected from the outlet is blown away toward the terminal end, and the discharge door 23 is opened to discharge the fluid from the discharge port 22. In addition, 25 is a combustion air duct, 26 is a flexible pipe, and 27 is a hydraulic cylinder. However, in the case of the above-mentioned intruded ash discharge device, if the hollow rostre 20 is quite long, or if there is a large amount of infiltrated ash, or if the specific gravity of the intruded ash is high, the intruded ash cannot be completely discharged. , there was a problem that it remained inside the hollow rooster 20. As a result, the passage of combustion air in the hollow roistle 20 is blocked, the cooling effect on the upper surface of the hollow roostle 20 is reduced, and various problems have arisen, such as causing a burnout accident of the hollow roostle 20. (Problems to be solved by the invention) The present invention was devised to solve the above-mentioned problems, and its purpose is to provide a hollow stoker that can reliably and quickly discharge the ash that has entered the hollow rostre. To provide an intrusion ash evacuation device that (Means for Solving the Problems) The intruded ash discharge device of the present invention has a nozzle main pipe for discharging intruded ash disposed along the longitudinal direction in a hollow rostrum having a vertically elongated box shape. Discharge nozzles for discharging the invading ash in the hollow roost to the terminal side are installed in the nozzle main pipe for use at appropriate pitches, and the intruding ash in the hollow roost is stirred between each discharge nozzle and in the discharge nozzle main pipe. It is characterized in that stirring nozzles are provided at appropriate pitches, and a discharge door that can be opened and closed and a discharge port for intruding ash are provided at the end of the hollow rooster. (Function) The ash that has entered the hollow rooster is strongly stirred by the pressure fluid injected from the stirring nozzle, and the frictional resistance with the inner surface of the hollow rooster is removed. On the other hand, the agitated infiltrated ash is blown away by the pressure fluid injected from the discharge nozzle to the terminal end side of the hollow roistle and discharged from the discharge port. At this time, the discharge door is in an open state due to the pressure fluid injected from the discharge nozzle. (Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view showing an example of a parallel rocking type hollow stoker provided with an infiltrated ash discharge device according to the present invention, and the hollow stoker includes hollow movable rostles 1a and hollow fixed rostles 1b alternately arranged in parallel. Each hollow movable rotor 1a is configured to swing in the front-rear direction (in the direction of the arrow) via a push rod 2, a shaft 3, a lever 4, a hydraulic cylinder 5, and the like. Further, a protruding strip 6 is provided at the center of each rooster 1a, 1b, and a large number of combustion air holes are provided in the side wall thereof along the longitudinal direction.
Incidentally, the combustion air is supplied from the common air duct 8 through the distribution flexible tube 9 into each of the roosts 1a and 1b, and is injected from the combustion air holes. FIGS. 2 and 3 are cross-sectional views of a hollow rostrum 1 constituting a hollow stoker with an infiltrated ash discharge device installed. It consists of a vertically long H-shaped grate bar 10 and a grate board 11 placed and fixed above it. Further, the grate board 11 is formed with a bulging strip 6 projecting upward in the center thereof,
A large number of combustion air holes 7 are formed along the longitudinal direction in the side wall of the bulging strip 6 at a constant downward inclination angle with respect to the horizontal plane. Incidentally, combustion air is supplied into the hollow rooster 1 via a common air duct 8 and a flexible distribution pipe 9. On the other hand, a nozzle main pipe 12 for discharging intruded ash is disposed in the hollow rostrum 1 along the longitudinal direction, and a discharge nozzle 13 for discharging intruded ash and a nozzle main pipe 12 for discharging intruded ash are provided in the discharge nozzle main pipe 12. A stirring nozzle 14 for stirring is provided respectively. That is, in this embodiment, as shown in FIG. 3, the discharge nozzle main tube 12 is disposed along the longitudinal direction while being in contact with the side wall of the grate bar 10, and has one end that is in contact with the side wall of the grate bar 10. A flexible pipe 15 for supplying pressure fluid such as steam is connected. In this embodiment, as shown in FIG. 5, the discharge nozzles 13 are provided at regular intervals, for example, at a pitch of 1 m or less, and direct the pressure fluid in the axial direction of the discharge nozzle main pipe 12 and into the hollow space. It is designed to eject toward the terminal end of the rostol 1. Further, as shown in FIG. 3, the discharge nozzle 13 is provided in the discharge nozzle main pipe 12 in an inclined state at an α angle (0 to 15 degrees) with respect to the vertical direction. In this embodiment, as shown in FIG. 5, the stirring nozzles 14 are provided between the respective discharge nozzles 13 and in the discharge nozzle main pipe 12 at an appropriate pitch of, for example, 150 to 200 mm, and are used to supply pressure fluid. fire bar 10
It is designed to eject onto the bottom wall. Further, as shown in FIG. 4, the stirring nozzle 14 is provided in the discharge nozzle main pipe 12 in a state of being inclined at a β angle (0 to 45 degrees) from the vertical direction. Note that the reason why the discharge nozzle 13 and the stirring nozzle 14 are inclined with respect to the vertical direction is that it has been found through experiments that the stirring effect and the discharge effect of the invading ash can be promoted. A discharge port 16 for invading ash is formed at the end of the hollow rooster 1, and a discharge door 17 for opening and closing the discharge port 16 is provided so as to be swingable by a shaft 18. The discharge door 17 is installed at an angle of γ (3 to 15 degrees) with respect to the vertical direction, as shown in FIG.
It is equipped with The weight of this weight 19 is set so that the discharge door 17 is opened by pressure fluid when the intruded ash is being discharged, and the discharge port 16 is closed at times other than when the intruded ash is being discharged. This is because if the exhaust port 16 is always open, combustion air will leak from the exhaust port 16, resulting in a reduction in the combustion effect. When intruding ash enters through the combustion air holes 7 and accumulates on the bottom wall of the grate bar 10, pressurized fluid such as air and steam is introduced into the discharge nozzle main pipe 12 through the flexible pipe 15. do. Then, the pressure fluid is injected into the hollow rooster 1 from the stirring nozzle 14 and the discharge nozzle 13. The pressure fluid injected from the stirring nozzle 14 causes a turbulent flow inside the hollow roaster 1, strongly stirring the intruding ash accumulated on the bottom wall of the grate bar 10, and removing the frictional resistance between the intruding ash and the bottom wall. . On the other hand, the pressure fluid injected from the discharge nozzle 13 blows away the agitated intruded ash toward the discharge port 16 side. At this time, since the discharge nozzle main pipe 12 is in contact with the side wall of the grate bar 10, it does not become an obstacle to the discharge work of the intruded ash. In addition, the discharge nozzle 13 on the terminal side
The discharge door 1 is opened by the pressure fluid injection pressure and wind speed from
7 in the direction of the arrow in FIG. Therefore, the intruded ash will be discharged to the outside of the hollow rooster 1 through the discharge port 16. Incidentally, the operation for discharging the intruded ash is automatically controlled by a timer so that it is performed at regular intervals. Table 1 below shows the results of a comparative test between the intruded ash discharging device of the present invention and the conventional intruded ash discharging device.
However, ○ mark in the evaluation column of Table 1 indicates approximately complete discharge, △
A mark indicates that some amount remains but can be removed by the next blow, and an x mark indicates that the remaining amount may become a nucleus and grow.

【table】

[Table] (Effects of the invention) As mentioned above, the infiltrated ash discharge device of the present invention has a nozzle main pipe for discharging intruded ash arranged in the hollow rostrum,
Since the discharge nozzle main pipe is provided with a discharge nozzle for discharging the ash that has entered the hollow rostle and a stirring nozzle that stirs the ash that has entered the hollow rostle, the ash that has entered the hollow rostle is stirred by the stirring nozzle and the ash that has entered the hollow rostle is stirred by the stirring nozzle. Frictional resistance with the inner surface is removed, and the discharge nozzle allows the discharge nozzle to easily discharge the product to the outside of the hollow rooster.
As a result, even if the hollow rostrum is long, or even if there is a large amount of infiltrated ash, or if the specific gravity of the intruded ash is high, the intruded ash can be discharged reliably and quickly.
This provides various effects such as not interfering with the supply of combustion air.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a parallel swing type hollow stoker equipped with an infiltrated ash discharging device according to the present invention, Fig. 2 is a longitudinal sectional view of a hollow stoker equipped with an infiltrated ash discharging device, and Fig. 3 is a vertical sectional view of a hollow stoker equipped with an infiltrated ash discharging device. FIG. 4 is a sectional view taken along the line - in FIG. 2, FIG.
FIG. 6 is a longitudinal cross-sectional view of a hollow roistle equipped with a conventional intruded ash discharge device. 1 is a hollow rostle, 12 is a nozzle main tube for discharging intruded ash, 13 is a discharge nozzle, 14 is a stirring nozzle,
16 is the discharge port, and 17 is the discharge door.

Claims (1)

[Scope of utility model registration request] An ash discharge nozzle main pipe 12 enters the hollow rostol 1 having a vertically long box shape along its longitudinal direction.
The discharge nozzle main pipe 12 is provided with discharge nozzles 13 at appropriate pitches for discharging the invading ash in the hollow rostrum 1 to the terminal end side, and each discharge nozzle 13
Stirring nozzles 14 for stirring the invading ash in the hollow rostrum 1 are provided at appropriate pitches between the discharge nozzle main pipe 12 and a discharge door 17 that can be opened and closed at the end of the hollow rostrum 1 and a discharge port for the intruded ash. A device for discharging infiltrated ash in a hollow stoker, characterized in that a hollow stoker is provided with an intrusion ash discharge device.