JPH0518578Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hearth ash discharging device for a pulverized coal furnace for discharging ash deposited on the hearth of the pulverized coal furnace.

[Prior Art] As shown in Fig. 3, the conventional technology injects pulverized coal into the furnace body a from a nozzle or the like and burns it.
It was designed to heat a plurality of heating tubes b disposed inside. A part of the ash c of the pulverized coal burned in the furnace body a is discharged outside the furnace through the exhaust gas pipe d, but the other part falls and is provided as a hearth below the furnace body a. It is deposited on the hopper e. This hotsupa e
The lower part of is connected to a discharge pipe g via a rotary valve f. With such a configuration, the ash c that has fallen into the hopper e is transferred to the rotary valve f.
It was designed to be discharged to the discharge pipe g through the discharge pipe g, and discharged out of the furnace through the discharge pipe g. The rotary valve f prevents outside air from entering the furnace body a when the ash c is discharged outside the furnace body a, and also maintains the pressure inside the furnace constant.

[Problems to be solved by the invention] In the case of the above-mentioned furnace, since the hopper e is provided below the furnace body a, the height of the furnace becomes high, and the construction space is limited, and the construction It was expensive and uneconomical.

In view of the above-mentioned problems, the present invention aims to provide a hearth ash discharging device for a pulverized coal-fired furnace that can lower the furnace height of the pulverized-coal-fired furnace to make it more economical.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a method for discharging hearth ash of a pulverized coal-burning furnace that discharges ash accumulated on the hearth of a pulverized coal-burning furnace to the outside of the furnace. In the apparatus, a plurality of swirling vanes for scraping up the accumulated ash are arranged closely on the hearth so that their orbits intersect with each other, and these swirling vanes are arranged so that the scraped ash is directed outward in the radial direction. Fine powder formed in a curved manner so as to move, and characterized in that the hearth is provided with an ash discharge port at the peripheral edge within the trajectory range of the swirling vanes, at least at a location where the trajectory of the swirling vanes intersects. This was used as a hearth ash discharge device for a charcoal furnace.

[Function] Since the plurality of swirling vanes are densely arranged so that their orbits intersect with each other and are curved, most of the ash in the hearth is caused by the swirling vanes, and the swirling vanes are arranged in a curved manner. Since the ash is scraped outward, the ash collects on the periphery within the orbit of the swirling blades. Since the ash discharge port is provided at least at the peripheral edge where the loci of the swirling vanes intersect, that is, at the location where a large amount of ash is collected by the plurality of swirling vanes, the ash can be discharged efficiently. Therefore, the ash in the hearth is scraped up and collected by the swirling blades and then discharged from the ash discharge port, making it possible to actively and efficiently discharge the ash.Furthermore, it is necessary to provide a hopper below the hearth. This allows the furnace to be built with a low height.

[Example] An embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, 1 indicates the furnace body of a pulverized coal furnace, and 2 indicates the hearth. A plurality of discharge ports 3 are provided in the hearth 2 at required locations or at predetermined intervals, and a rotary valve 4 is provided below the discharge ports 3.
A discharge pipe 5 is connected thereto. The hearth 2
A plurality of swirling blades 6 are arranged along the upper surface of the hearth 2 so that their swirling trajectories intersect with each other, and part of the blades 6 passes over any of the discharge ports 3. They are provided so that they can be rotated and do not interfere with each other while turning. Specifically, the exhaust ports 3 of the hearth 2 are provided at the peripheral edge within the locus range of the swirl vane 6, and are spaced approximately 90 degrees apart in the circumferential direction, and three or more of these exhaust ports are provided. The outlet 3 is arranged at a location where the trajectories of the swirl vanes intersect. 7
is a driving machine for the swirl vane 6. Further, each of the swirling vanes 6 is formed to be curved so that its longitudinal direction bulges out in the swirling direction, so that the collected ash moves outward in the radial direction. With such a configuration, when discharging the ash 8 deposited on the hearth 2, when each of the swirling blades 6 is rotated, the ash 8 on the floor is scraped up by the swirling blades 6, and the ash 8 is collected as desired. It is discharged downward from the discharge port 3. At this time, a plurality of swirl vanes 6
The ash on the hearth 2 is scraped outward in the radial direction by the swirling blades 6 because the ash on the hearth 2 is densely arranged so that their swirling trajectories intersect with each other and are curved. Since the ash is gathered together, the ash collects on the peripheral portion within the trajectory range of the swirling vane 6. In the illustrated example, four ash discharge ports 3 are provided on the peripheral edge thereof, and ash discharge ports are also provided at locations where the trajectories of a plurality of swirl vanes 6 intersect, that is, locations where more ash is collected by the swirl vanes 6. 3, the ash can be efficiently discharged.

Therefore, the ash on the hearth 2 is scraped up and collected by the swirling blades 6 and then discharged from the ash discharge port 3, so that most of the ash deposited on the hearth 2 is actively and efficiently discharged. be able to.

In addition, as shown in FIG. 1, a retention space is provided between the discharge port 3 and the rotary valve 4 to retain a predetermined amount of ash scraped by the swirling blades 6, so that the rotary valve 4 can be placed in the space. It is configured so that it can be operated intermittently to discharge the ash depending on the amount of ash being scraped up inside.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but a chain wheel is attached to each of the rotating shafts of the swirl vanes, a chain is wound around these wheels, and the chain is also wound around a drive machine. It is also possible to swivel the swivel vanes by means of a small number of drives. Various other changes may be made without departing from the gist of the present invention.

[Effects of the invention] In summary, the present invention exhibits the following effects.

(1) A plurality of curved swirl vanes are densely arranged on the hearth so that their orbits intersect with each other, and the orbits of the swirl vanes intersect at least at the peripheral edge within the orbit range of the swirl vanes. Since ash discharge ports are provided at certain locations, most of the ash that accumulates on the hearth can be actively and efficiently discharged.

(2) These eliminate the need to provide a hopper below the furnace body, so the furnace body can be built low, making it economical.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a plan view of a part of FIG. 1, and FIG. 3 is a sectional view showing a conventional example. In the figure, 1 is a furnace body, 2 is a hearth, 3 is a discharge port, 4 is a rotary valve, 5 is a discharge pipe, 6 is a swirl vane, 7
is the driving machine, and 8 is the ash.

Claims (1)

[Scope of utility model registration request] In a hearth ash discharging device for a pulverized coal-burning furnace that discharges ash accumulated on the hearth of a pulverized coal combustion furnace to the outside of the furnace, a swirling vane that scrapes up the accumulated ash on the hearth is arranged so that the trajectory of its rotation is A plurality of swirling vanes are arranged densely so as to intersect with each other, and these swirling vanes are curved so that the ash being scraped up moves outward in the radial direction. A hearth ash discharge device for a pulverized coal furnace, characterized in that an ash discharge port is provided at least at a location where the loci of the swirling blades intersect at the peripheral edge of the furnace.