JP3848783B2 - Ash pusher structure of ash melting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention heats and melts the surface of ash, which is a material to be melted, such as incineration ash and fly ash discharged from municipal incinerators and industrial waste incinerators, and ash discharged from coal fired boilers, etc. The present invention relates to the structure of an ash pusher of an ash melting furnace that discharges molten ash as slag.
[0002]
[Prior art]
The burner-type ash melting furnaces generally used include a circular rotary surface melting furnace and a square fixed surface melting furnace. For the sake of simplicity, an outline function will be described using a square fixed surface melting furnace. .
As shown in FIG. 5, the ash melting furnace 51 includes an inclined furnace bottom 55 that descends obliquely, an ash supply part 53 provided on one end side of the furnace body, a discharge port 57 provided on the other end side, The fixed burner 52 is provided on the furnace ceiling 56. The ash supply unit 53 includes an ash storage unit 60 having an ash supply port 54 at the lower end, and the ash storage unit 60 stores an object to be melted such as incinerated ash and is an ash that is the material to be melted stored from below. 50 is extruded toward the discharge port 57, and the ash supply layer 59 is formed along the inclined surface of the furnace bottom 55.
[0003]
The fixed burner 52 is provided on the central axis of the furnace ceiling 56 of the ash melting furnace 51. The liquid fuel pumped into the burner is atomized by high-pressure air or steam from the exhaust heat boiler, and injected. The atomized fuel is burned by mixing with high-temperature combustion air supplied together, and the flame radiant heat heats and melts the surface of the ash supply layer 59.
Then, the furnace bottom end on the discharge port 57 side is disposed so as to enter the flame radiation region of the burner 52, and the outer surface of the ash supply layer 59 that continues to move toward the discharge port 57 is heated and melted, and molten ash is obtained. 25 is formed and dropped as a slag from the discharge port 57 and discharged to the outside through a lower water-sealed conveyor (not shown).
[0004]
Further, the ash supply layer 59 is formed in a laminated form directly at the angle of repose of the ash by natural fall from the ash supply port 54 of the ash reservoir 60 or along the furnace bottom 55 at the entrance of the furnace bottom 55. A pusher 58, which is a pusher device provided, pushes out the ash 50 of the ash storage section 60 toward the discharge port 57 on the other end side of the furnace body and supplies it.
[0005]
[Problems to be solved by the invention]
The state of heat melting of the ash on the ash supply layer surface by the burner 52 in the ash melting furnace 51 is shown in FIG. 6A because the heat melting burner 52 is installed on the furnace ceiling of the furnace center axis. As shown in the AA view of FIG. 5, a substantially circular flame radiation region 35 is formed on the central axis of the surface of the ash supply layer 59, and the ash in the surrounding heating and melting region 35 a including the region 35. Is melted by heating to form a molten ash pool, and molten ash 25 is dropped from the discharge port 57 as a slag from the pool.
[0006]
However, as shown in FIG. 6A and FIG. 6B BB view shown in FIG. 6A, the structure of the pressing portion 58a of the conventional pusher 58 is a rectangular cross section having a thickness t. Therefore, the ash in the case of using the above-described conventional pusher 58 is pushed out equally and uniformly over the entire width of the furnace bottom 55.
Eventually, ash is supplied to the area outside the heating area 35a as well as the heating and melting area 35a. The ash supplied to the outside of the heating area 35a is pushed out from the ash supply port 54 toward the discharge port 57 in an undissolved state, and unmelted ash is also included in the molten ash 25 dripping from the discharge port 57. Mixing slag will reduce the quality.
[0007]
The present invention has been made to solve the above-mentioned problems, and devised the shape of the pressing portion of the pusher that sends ash to the discharge port while forming the ash supply layer along the furnace bottom, and the pusher sends out the ash. The present invention is to provide an ash pusher structure for an ash melting furnace that can suppress the supply of ash to a region other than the adjacent heating and melting region including the flame radiation region of the burner as low as possible.
[0008]
[Means for Solving the Problems]
Accordingly, the present invention provides an ash supply port on one end side of the furnace body, forms an outlet for molten slag on the other end side, and follows the furnace bottom inclined by the ash pusher device for the ash supplied from the ash supply port. In an ash melting furnace that is heated and melted by a burner provided in the center of the furnace ceiling while being pushed and moved to the discharge port side,
The ash-pressing surface shape of the pusher tip of the ash pusher device corresponds to the central portion corresponding to the melting and heating region heated and melted by the burner and the non-melting heating region located on both sides of the heating region in the furnace bottom width direction. The both sides of the central part are made different, the central part is formed in a flat shape in the width direction of the furnace bottom, and both side parts are moved backward at a deep angle so that the supply of ash at both side parts is advanced on both sides of the pusher. The first invention is formed so as to be left behind .
According to a second aspect of the present invention, the height of the ash pressing surface at the tip of the pusher of the ash pusher device is set such that a center portion corresponding to a melting and heating region heated and melted by the burner, and both sides of the heating region in the furnace bottom width direction Different from the both sides of the central portion corresponding to the non-melting heating region located at the center, the tall height of the central portion is formed higher than both sides, the ash supply to the central portion is thickened, and the ash on both sides It is characterized by keeping the supply amount low.
[0009]
A third invention is concave so as to direct the ash pusher device of the pressing force of the ash layer caused by ash pressing surface of the pusher's distal end of the pusher corresponding to the center of the flame radiation region of the burner always ash pressing direction central upper shaft An arcuate concave pressing surface is formed so that the ash layer supplied by the pusher can be supplied toward the center of the flame radiation area.
[0010]
[Action]
According to the present invention, in the ash pressing surface structure at the tip of the ash pusher, the shape of the pressing portion at the tip of the pusher having a conventional rectangular cross section and a constant amount of extrusion in the width direction is changed, so that Since the amount of extrusion is increased, the amount of ash supplied to the furnace center can be increased to minimize the amount of ash supplied to both sides.
[0011]
According to the first aspect of the present invention, the tip of the ash pusher is made taller at the center, or the center is formed in a flat shape, and both sides thereof are inclined backward and inclined at a deep angle. As a result, the ash supply at both sides excluding the heating area including the burner flame radiation area at the central part is in the shape of a swept-back wing formed so as to be left behind from both sides of the pusher moving forward. As the ash in the central protrusion is pushed forward, the ash in the swept wings on both sides is left behind, and as a result, the ash can be supplied only to the center of the furnace.
[0012]
According to a third aspect of the present invention, both sides of the pusher tip protrude, and a pressing surface is formed by a concave notch in the center of the protruding portion, and the pressing direction of the pressing surface is the central axis of the burner flame radiation region. Since the target configuration is adopted, the supply of ash to the center of the furnace can be made thick and the ash supply amount on both sides can be kept low.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the form of the Example of this invention is demonstrated with the example of illustration. However, the dimensions, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Absent. In addition, the same code | symbol is used about the same member as drawing which shows a prior art example.
[0014]
FIG. 1 shows the first embodiment of the ash pusher structure of the present invention, and shows the shape of a pusher pressing portion and the supply state of ash formed by the pusher to a nearby heating region including the flame radiation region of the burner. It is a schematic diagram shown.
As shown in FIG. 1, the pressing portion 10 of the pusher shown in the first embodiment has a width that is narrower than the entire width of the furnace bottom 55 at the base, and has a central tip (ash pressing surface) formed in a flat shape, and both sides thereof are rearward. More specifically, it is formed in the shape of a front-cut type piece, and both sides are formed with arc-slope lines with deep receding angles. Therefore, the lump of ash that is pressed by the tip of the pressing portion 10 by the reciprocating motion of the appropriate depth indicated by the arrow and moves forward forms the ash supply layer 10a that moves while narrowing the tip portion for a while as it advances, and the burner It moves toward the heating area 35a in the vicinity of the flame radiation area 35.
Thus, if the width S of the tip portion (ash pressing surface) and the tip stop position of the pressing portion 10 are appropriately set, the melting ash required by the flame radiation region 35 is efficiently supplied and the non-heating region. Ashes can be kept low.
[0015]
FIG. 2 is a schematic diagram illustrating the shape of the pressing portion of the pusher and the state of movement of the ash supply layer formed by the pressing portion according to the second embodiment of the present invention.
As shown in FIG. 2, the pressing portion 11 of the pusher shown in the second embodiment is formed by a member having a width close to the entire width of the furnace bottom 55, and the center is recessed in a concave arc shape to form a concave ash pressing surface 11a. The ash supply layer 11d is formed so that the pressing force formed by the pressing surface 11a is always directed on the central axis.
Therefore, ash can be supplied toward the center of the flame radiation area 35 on the central axis.
[0016]
The shape of the concave ash pressing surface may be a semicircular concave shape shown in FIG. 4 (A) or a parabolic concave shape shown in FIG. 4 (B).
[0017]
FIG. 3 (A) is a schematic diagram showing the shape of the pressing portion of the pusher showing the third embodiment of the present invention and the state of movement of the ash supply layer formed by the pressing portion.
As shown in FIG. 3A, the pressing portion 12 of the pusher shown in the third embodiment is formed so as to have a convex cross-sectional shape by a member having a width close to the full width of the furnace bottom 55, and the central convex shape. A large amount of ash can be supplied from the low hills on both sides by the partial ash pressing surface , and a substantially convex ash supply layer 12d is formed to supply sufficient ash to the heating region 35a that receives a large amount of heating heat. It is what I did.
In addition, you may make it form with the press part 12b which inclined the rising surface of the convex part shown in FIG.3 (B) as a convex cross-sectional shape, and has a more gentle ash supply surface.
[0018]
【The invention's effect】
As described above, according to the present invention, in the structure of the tip of the ash pusher , the shape of the pressing portion at the tip of the pusher having a conventional rectangular cross-section and a constant amount of extrusion in the width direction is changed to the center of the furnace. Since the amount of extrusion is increased, the amount of ash supplied to the furnace center can be increased to minimize the amount of ash supplied to both sides.
[0019]
Further, the invention of claim 1, wherein, to protrude forward ash pressing surface central portion of the pusher's distal end to the frame shape, the left and right sides retracts deep angle inclined, heated region including a burner flame radiation area of the central portion Since the supply of ash at both sides except for the shape of the wing is formed so that it is left behind from both sides of the pusher that moves forward, the ash on the protruding part of the central ash pressing surface is pushed forward as the pusher advances, but both sides The swept wing ash is left behind, and as a result, the ash can be fed only to the center of the furnace.
[0020]
Further, the invention of claim 3, is projected to both sides of the ash pressing surface of the pusher's distal end to form a concave arc-shaped concave pressing surface in the center than its projecting portion, more ash pressing direction burner flame in pressing pressure surface Since the configuration is aimed at the central axis that passes the center of the radiation region, the supply of ash to the furnace center can be made thicker, the supply amount can be increased, and the supply amount on both sides can be minimized.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a shape of a pressing portion and a state of movement of an ash supply layer according to a first embodiment of a pusher structure of the present invention.
FIG. 2 is a schematic diagram showing a shape of a pressing portion and a state of movement of an ash supply layer showing a second embodiment of the pusher structure of the present invention.
FIG. 3A is a schematic view showing the shape of a pressing portion and the state of movement of an ash supply layer according to a third embodiment of the pusher structure of the present invention, and FIG. 3B is a modified example of FIG. .
4A and 4B are diagrams showing another embodiment of FIG. 2, wherein FIG. 4A is a schematic view showing a pressing portion formed in a parabolic shape, with a concave pressing surface formed in a semicircular shape. is there.
FIG. 5 is a schematic diagram showing the state of ash extrusion in a conventional ash melting furnace.
6A is an AA view of FIG. 5, and FIG. 6B is a BB view of FIG.
[Explanation of symbols]
10, 11, 12, 13, 14, 12b Press part 10a, 11d, 12d Ash supply layer 11a, 13a, 14a Press surface 25 Molten ash 35 Flame radiation area 35a Heating area

Claims (3)

An ash supply port is provided on one end side of the furnace body, a discharge port for molten slag is formed on the other end side, and the ash supplied from the ash supply port is disposed on the discharge port side along the furnace bottom inclined by an ash pusher device. In an ash melting furnace that is heated and melted by a burner provided in the center of the furnace ceiling while being extruded and moved,
The ash-pressing surface shape of the pusher tip of the ash pusher device corresponds to the central portion corresponding to the melting and heating region heated and melted by the burner and the non-melting heating region located on both sides of the heating region in the furnace bottom width direction. The both sides of the central part are made different, the central part is formed in a flat shape in the width direction of the furnace bottom, and both side parts are moved backward at a deep angle so that the supply of ash at both side parts is advanced on both sides of the pusher. An ash pusher structure for an ash melting furnace, which is formed so as to be left behind . An ash supply port is provided on one end side of the furnace body, a discharge port for molten slag is formed on the other end side, and the ash supplied from the ash supply port is disposed on the discharge port side along the furnace bottom inclined by an ash pusher device. In an ash melting furnace that is heated and melted by a burner provided in the center of the furnace ceiling while being extruded and moved,
The height of the ash-pressing surface at the tip of the pusher of the ash pusher device is set at the center corresponding to the melting and heating region heated and melted by the burner, and the non-melting heating located on both sides of the heating region in the furnace bottom width direction. Different at both sides of the central portion corresponding to the region, the tall height of the central portion is formed higher than both side portions, the ash supply to the central portion is thickened, and the ash supply amount on both sides is kept low. An ash pusher structure for an ash melting furnace characterized by An ash supply port is provided on one end side of the furnace body, a discharge port for molten slag is formed on the other end side, and the ash supplied from the ash supply port is disposed on the discharge port side along the furnace bottom inclined by an ash pusher device. In an ash melting furnace that is heated and melted by a burner provided in the center of the furnace ceiling while being extruded and moved,
A concave pressing surface having a concave arc shape is formed so that the pressing force of the ash layer by the ash pressing surface at the pusher tip of the ash pusher device is always directed on the central axis of the ash pressing direction of the pusher corresponding to the center of the flame radiation area of the burner. An ash pusher structure for an ash melting furnace , wherein the ash layer supplied by the pusher can be supplied toward the center of the flame radiation region .

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