JP2011056392A - Garbage disposal facility and garbage disposal method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a garbage disposal facility and a garbage disposal method by which a magnetic material (iron oxide) in incineration ash subjected to a landfill disposal conventionally can be reused. <P>SOLUTION: The garbage disposal facility includes: a garbage incinerator 2: a magnetic sorter 4 for magnetically sorting the magnetic material from the incineration ash discharged from the garbage incinerator 2; and a reduction furnace 15 for executing reduction metallization treatment of the magnetic material sorted by the magnetic sorter 4. Also, the garbage disposal method includes: a process of executing incineration of combustible garbage in the garbage incinerator; a magnetic sorting process of magnetically sorting the magnetic material from the incineration ash discharged from the garbage incinerator; and a process of executing the reduction metallization treatment of the magnetic material sorted by the magnetic sorting process in the reduction furnace. The iron oxide (magnetic material) which has been conventionally filled in the land is made reusable by executing reduction treatment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a waste treatment facility and a waste treatment method for reusing magnetic substances (iron oxide) magnetically selected from incinerated ash.

  A processing flow of a conventional general waste disposal facility is shown in FIG.

  The bulky waste is separated at the recycling facility 30, the iron and aluminum are sold for reuse as scrap materials, and the combustible residue is incinerated in the waste incinerator 2.

  Waste plastic is separated and compressed at the separation facility 20 and recycled at the recycling facility.

  The combustible waste is incinerated at a high temperature (for example, 800 ° C. to 1000 ° C.) in the waste incinerator 2, and the incinerated ash 3 discharged from the waste incinerator 2 is made nonmagnetic by the magnetic separator (iron oxide) 5. It is separated into the product (incinerated ash) 6. The non-magnetic material (incinerated ash) 6 is heated and reduced at a higher temperature (for example, 1300 to 1400 ° C.) in the melting furnace 7, the organic material is pyrolyzed, gasified and burned, and the inorganic material is melted to form slag 8. The metal which is taken out and remains in the non-magnetic material (incineration ash) is separated from the slag in the specific gravity in the melting furnace and taken out as molten metal. In addition, low boiling point heavy metals and chlorides contained in the non-magnetic material (incineration ash) are volatilized by melting, and are collected as molten fly ash by a dust collector downstream of the melting furnace 7 by cooling and solidification. Slag is mainly recycled and used effectively as civil engineering and construction materials. Molten metal is mainly composed of iron, and is effectively used as a counterway for construction machines. Since molten fly ash contains heavy metals such as lead and zinc in high concentrations, it is recycled by Yamamoto reduction. Moreover, when incineration ash discharged | emitted from a stoker type incinerator is baked, it is baked by a kiln furnace separately from a stoker type incinerator (patent document 1 etc.).

JP 2005-164059 A

  However, the magnetic material (iron oxide) separated from the incineration ash by the magnetic separator is oxidized by high-temperature combustion in the incinerator and is not suitable for a raw material for recycling. Is the actual situation.

  Therefore, an object of the present invention is to provide a waste treatment facility and a waste treatment method that make it possible to reuse magnetic substances (iron oxide) in incinerated ash that has been disposed of in landfills.

  In order to achieve the above object, a waste treatment facility according to the present invention includes a waste incinerator, a magnetic separator for magnetically sorting magnetic materials from the incinerated ash discharged from the waste incinerator, and a magnetic material selected by the magnetic separator. And a reduction furnace that performs a reduction metallization treatment.

  The waste treatment facility according to the present invention preferably further comprises a mixing / molding machine that mixes and molds waste plastic with the magnetic material before the magnetic material is put into a reduction furnace. In this case, it is preferable to include a crusher that crushes the magnetic material before mixing the magnetic material with waste plastic, and a sieve that screens the magnetic material crushed by the crusher to a predetermined particle size or less.

  It is preferable to provide an exhaust gas treatment facility for treating the exhaust gas of the reduction furnace together with the exhaust gas of the waste incinerator. Alternatively, when the waste treatment facility includes a melting furnace, an exhaust gas treatment facility for treating the exhaust gas of the reduction furnace together with the exhaust gas of the melting furnace may be provided.

  The reduction furnace includes a water-cooled stoker provided with a frame-integrated water-cooled grate and a high-temperature reducing gas supplied from a lower part of the grate, and the frame-integrated water-cooled grate extends left and right through the furnace wall. A pair of supporting portions and a connecting portion that connects the pair of supporting portions are integrally formed, a fireproof protective layer is provided on the surface of the connecting portion, and a cooling water flow that communicates the supporting portions and the connecting portions on both sides. It is preferable that a passage is formed inside, and a cooling water inlet / outlet is provided at a portion outside the furnace wall of the support portion.

  In order to achieve the above object, a hybrid stoker furnace that includes a firing stoker having a water-cooled grate integrated with a frame at the rear stage of a combustion stoker having an air-cooled grate and that performs incineration ash firing treatment integrally with the incinerator. The waste treatment facility according to the present invention is provided.

  Furthermore, in order to achieve the above-mentioned object, the waste treatment method according to the present invention includes a step of incinerating combustible waste in a waste incinerator, and a magnetic force separation step of magnetically separating magnetic substances from the incinerated ash discharged from the waste incinerator. And a reduction metallization treatment of the magnetic material selected by the magnetic force selection step in a reduction furnace.

  In the waste treatment method according to the present invention, it is preferable to use waste plastic as a reducing agent in the reduction metallization treatment step. In this case, the waste plastic is preferably mixed with the magnetic material, molded, and pelletized. It is preferable to include a crushing step of crushing the magnetic material with a crusher before mixing the magnetic material with waste plastic, and a sieving step of sieving the crushed magnetic material to a predetermined particle size or less.

  The exhaust gas of the reduction furnace is preferably treated with a common exhaust gas treatment facility in combination with at least one of the exhaust gas of the waste incinerator and the exhaust gas of the melting furnace.

  According to the present invention, it is possible to reduce the amount of landfill disposal, increase the profit on sale of metal, and improve the recycling rate by reducing iron oxide (magnetic material) that has been disposed of in landfill.

  Moreover, waste plastic can be effectively used by using waste plastic in the waste treatment facility as a reducing agent. In particular, waste disposal facilities are generally equipped with waste plastic treatment facilities, making them easy to use.

  Further, the exhaust gas discharged from the reduction furnace can be treated in common with the incinerator and melting furnace exhaust gas treatment equipment in the waste treatment facility, thereby suppressing an increase in equipment costs.

  In addition, by using a stoker-type reducing furnace that supplies high-temperature reducing gas from the lower part of the frame-integrated water-cooled grate, large drop stirring as in the kiln type is not performed, so the amount of fly ash generated can be suppressed. it can.

  Also, a frame-integrated water-cooled grate is incorporated into the post-combustion stage of a typical stoker-type incinerator consisting of a drying stage, a combustion stage, and a post-combustion stage, and a high-temperature reducing gas is introduced from the bottom of the frame-integrated water-cooled grate By supplying the sensible heat, the sensible heat of the incinerated ash that has been incinerated in the combustion stage can be used effectively, and a reduction process with high thermal efficiency can be performed.

It is a block diagram showing one embodiment of a waste disposal facility according to the present invention. It is a vertical side view which shows one Embodiment of the reduction furnace which is a component of the refuse disposal facility which concerns on this invention. It is a top view which shows one Embodiment of the grate which is a component of the reduction furnace of FIG. It is a top view which shows the operating state of the grate of FIG. It is a top view which shows the movable grate which is a component of the grate of FIG. 3 in a partial cross section. It is a longitudinal cross-sectional view which follows the VI-VI line of FIG. It is a top view which shows the fixed grate which is a component of the grate of FIG. 3 in a partial cross section. It is a longitudinal cross-sectional view which follows the VIII-VIII line of FIG. It is a longitudinal cross-sectional view which follows the IX-IX line of FIG. It is a longitudinal cross-sectional view which follows the XX line of FIG. It is a top view which shows other embodiment of a grate. It is a vertical side view which shows one Embodiment of the stoker type compound furnace which is a component of the refuse disposal facility which concerns on this invention. It is a block diagram which shows the conventional waste disposal facility.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol was attached | subjected to the same component through the whole figure.

  An embodiment of a waste treatment facility according to the present invention is shown in a block diagram in FIG. Combustible waste, bulky waste, and waste plastic are transported to the waste treatment facility 1.

  Combustible waste is incinerated in the waste incinerator 2. The incineration ash 3 discharged from the waste incinerator 2 is magnetically sorted by a magnetic separator 4 into a magnetic material 5 (iron oxide) and a non-magnetic material 6 (incineration ash). The non-magnetic material 6 selected by the magnetic separator 4 is melted in the melting furnace 7 as before, the slag 8 and the molten metal discharged from the melting furnace 7 are recycled, and the molten fly ash 9 is reduced to the base. The

  The magnetic material 5 selected by the magnetic separator 4 is crushed by the crusher 10 and then sieved to a desired particle size (for example, 59 mm or less) by the sieve 11, and the material on the sieve is on the upstream side of the crusher 10. Returning to the crusher 10 and re-crushing, fine magnetic material 5 (iron oxide) under the sieve is recovered.

  The waste treatment facility 1 is provided with a waste plastic separation treatment facility 20. Waste plastic from which unsuitable materials such as metal scraps have been removed at the sorting facility 20 is compressed and packaged and recycled, while some waste plastic is subjected to the above-mentioned magnetic separation and classification of magnetic materials (oxidized). (Iron) 5 is mixed (12), and the components are appropriately adjusted and then formed into pellets (13) to obtain reduced iron raw material. The mixing / molding machine for mixing and molding the waste plastic with iron oxide may be a single unit or a separate unit.

A reduction furnace 15 is disposed in the waste treatment facility 1 of the present invention. When the reduced iron raw material is heated at a high temperature (1100 ° C. to 1300 ° C.) in the reduction furnace 15, the plastic component instantaneously becomes a reducing gas (CO, H ₂ ) in the reduction furnace 15 to reduce the iron oxide, Iron is obtained.

  The exhaust gas from the reduction furnace 15 can be treated with exhaust gas using an exhaust gas treatment facility (not shown) of at least one of the waste incinerator 2 and the melting furnace 7. Thereby, since it is not necessary to add an exhaust gas treatment facility, an increase in facility cost can be suppressed.

  As in the past, the waste treatment facility 1 is also provided with a recycle facility 30 for separating and recycling oversized waste, and the iron separated at the recycle facility 30 is sold as a scrap material. The iron obtained by the reduction furnace 15 is sold for reuse as scrap raw material in the same manner as irons separated from bulky waste.

  Generally, waste disposal facilities are equipped with recycling facilities for oversized and non-combustible waste, and since the sales route for scraps has been established, it can also be used to sell iron that has been reduced in the reduction furnace 15. . In the case of a waste treatment facility where the melting furnace 7 does not move continuously, the reduction furnace 15 can be introduced without increasing the number of operators by operating the reduction furnace 15 during the suspension period of the melting furnace 7.

  In the above embodiment, waste plastic is used as a reducing agent for iron oxide, but coal, coke and the like conventionally used as a reducing agent can be added to incineration ash instead of waste plastic, or It can also be used in combination with waste plastic.

  One embodiment of the reduction furnace 15 is shown in FIG. FIG. 2 is a side view showing the internal structure of the stoker type reduction furnace 15A including the frame-integrated water-cooled grate 43. As shown in FIG. This stoker type reduction furnace 15A is different from a structure in which a refractory grate is mounted on a metal frame like a conventional stoker furnace and connected and supported to supply air from below the grate, as will be described later. In addition, the grate is formed integrally with the frame, and the cooling water flow path is formed inside, so that the high-temperature reducing gas can be supplied from the lower part of the grate.

  As shown in the figure, the stoker type reducing furnace 15A includes an inlet 41 for introducing the reduced iron raw material A, a pusher 42 for extruding the supplied reduced iron raw material A, and the reduced iron raw material A extruded thereby. Is provided with a grate 43 or the like.

  In the grate 43, a fixed grate 43A and a movable grate 43B are alternately arranged in an inclined manner in the front-rear direction (the left side in FIG. 2 is the front side) (in FIG. 2, a pair of fixed grate and movable grate are movable). Only the grate is shown.) As the movable grate 43B reciprocates in the forward / backward tilt direction, the reduced iron raw material A is sequentially conveyed downstream (left side in FIG. 2).

  The stoker type reduction furnace 15 </ b> A has a structure suitable for high-temperature reduction treatment of the reduced iron raw material A, and a burner 45 that radiates a flame is installed in a wind box 44 that forms a lower space of the grate 43.

  The wind box 45 has a box shape with an open top so that the high-temperature combustion exhaust gas B can be supplied to the entire lower part of the grate 43 and is not shown in the figure, but the inner surface is lined with a refractory. Yes.

  The burner 45 generates a high-temperature combustion exhaust gas B having a low oxygen concentration by burning fuel such as fossil fuel, COG gas, biogas, etc., and supplies it to the lower part of the grate 43. The low oxygen concentration high temperature combustion exhaust gas B supplied to the lower part of the grate 43 reduces the reduced iron raw material A on the grate 43 in a high temperature reducing atmosphere through the gap between the movable grate 43B and the fixed grate 43A. Can be processed.

  The high-temperature combustion exhaust gas B is preferably supplied while being controlled to an oxygen concentration of 1% or less. For example, the oxygen concentration of the high-temperature combustion exhaust gas B is detected by an oxygen concentration meter (not shown) before being supplied to the lower part of the grate 43, and if the detected oxygen concentration exceeds 1%, the burner The oxygen concentration can be controlled to 1% or less by adjusting the air ratio of the combustion air supplied to 45 and the air-fuel ratio of the fuel gas and the combustion air.

  Referring to FIGS. 3, 4, 7, and 8, the fixed grate 43 </ b> A of the stoker type reduction furnace 15 </ b> A has a rectangular shape in plan view, and a pair of left and right support portions 51 and 52, and these support portions 51. , 52 are connected to each other. The pair of left and right support portions 51 and 52 pass through the through holes 54a and 55a of the left and right furnace walls, that is, the left and right side walls 54 and 55 of the furnace body, and are supported and fixed to the side walls 54 and 55. The side walls 54 and 55 of the furnace body are refractory walls, and in the illustrated example, cooling water flow paths 54c and 55c through which the cooling water C circulates are formed in order to withstand high temperature gas.

  The movable grate 43 </ b> B of the stoker type reduction furnace 15 </ b> A includes a pair of left and right support parts 56, 57 that are L-shaped and a connection part 58 that connects the support parts 56, 57, with reference to FIGS. ing. The L-shaped support portions 56 and 57 include vertical pieces 56a and 57a extending in the front-rear direction and horizontal pieces 56b and 57b extending outward.

  The movable grate 43B is arranged so as to be displaced on the fixed grate 43A. The support portions 56 and 57 of the movable grate 43B pass through the through holes 54a and 55a of the side walls 54 and 55 of the furnace main body, and are connected to guide mechanisms 60 and 61 installed outside the furnace. X direction) is supported so as to be guided.

  The grate 43 is exposed to a hot gas of 1100 ° C. to 1300 ° C. supplied from below. Therefore, each of the fixed grate 43A and the movable grate 43B has cooling water flow paths 63 and 64 communicating with the support part and the connecting part, as shown in a partial cross section in FIGS. Yes. Cooling water inlets 63a, 64a and outlets 63b, 64b of the cooling water flow paths are provided outside the furnace of the support portions 51, 52, 56, 57, and are connected to these cooling water inlets / outlets 63a, 64a, 63b, 64b. The pipes 68a, 68b, 69a to 69e are not exposed to the high temperature gas in the furnace. The grate 43 is preferably made of cast water of a water pipe casting type in which the support portions 51, 52, 56, 57 and the connection portions 53, 58 are integrally cast. Alternatively, in the case where the internal cooling water flow path is formed by a straight through hole as in the fixed grate 43A in the illustrated example, a deep hole process is performed on a solid material (steel material), and both end openings are U-shaped pipes or the like. The flow path of the cooling water may be formed by pipe connection. The cooling water passages 63 and 64 are connected to a cooling water supply device (not shown) via a cooling water pipe, and the cooling water C circulates.

  In order to improve the fire resistance, the connecting portion 53 of the fixed grate 43A is formed thinner than the support portions 51 and 52, and the thinned portion is covered with a fire resistant protective layer 53a such as ceramic. Similarly, the connecting portion 58 of the movable grate 43B is formed thinner than the support portions 56 and 57, and the thinned portion is covered with a fireproof protective layer 58a. The fireproof protective layers 53a and 58a may be made of a ceramic plate or the like and fixed detachably.

  The movable grate 43B slides on the fixed grate 43A. A replaceable shoe 65 is attached to the upper part of the fixed grate 43A in order to cope with wear caused by sliding of the movable grate 43B. The shoe 65 also acts as a spacer that forms a gap between the fixed grate 43 </ b> A and the movable grate 43 </ b> B so that high-temperature gas passes from the bottom to the top of the grate.

  The movable grate 43B moves back and forth in a state where the support portions 56 and 57 at both ends penetrate the through holes 54a and 55a on the furnace side wall. When the movable grate 43B moves back and forth, a structure is employed to prevent leakage of processed materials and high-temperature exhaust gas from the through holes 54a and 55a on the side wall of the furnace.

  When the movable grate 43B moves forward (as shown in FIG. 4), a water cooling wall 67 is attached to the rear of the support portions 56 and 57 of the movable grate 43B in order to close the through holes 54a and 55a behind the movable grate 43B. Yes. The water cooling wall 67 includes a cooling water passage 67a (see FIG. 5). Therefore, when the movable grate 43B moves forward, as shown in FIG. 4, the rear water cooling wall 67 maintains a state where the rear through holes 54a and 55a of the movable grate 43B are closed.

  Further, in order to close the through holes 54a and 55a in front of the horizontal pieces 56b and 57b (below in FIGS. 3 and 4) when the movable grate 43B is retracted, the outer side surfaces of the vertical pieces 56a and 57a of the support portions 56 and 57 On the other hand, the water cooling walls 70 and 71 attached on the fixed grate 43A are arranged close to each other. The refractory blocks 70a and 71a are fixed to the inner side surfaces of the water cooling walls 70 and 71, and a water passage 80 (see FIG. 10) through which the cooling water circulates is formed. The water cooling walls 70 and 71 are attached so that the clearance G (see FIG. 10) between the vertical pieces 56a and 57a of the support portions 56 and 57 can be adjusted. Specifically, long holes 70c and 71c (see FIG. 3) extending in the width direction of the furnace are formed in the angles 70b and 71b for fixing the water cooling walls 70 and 71 on the fixed grate 43A. The water cooling walls 70 and 71 are fixed to the fixed grate 43A by bolts 70d and 71d and nuts not shown through 71c. Therefore, when the bolts 70d and 71d are loosened, the water cooling walls 70 and 71 slightly move the water cooling walls 70 and 71 in the width direction of the furnace (left and right direction in FIG. 3), and the vertical pieces 56a of the support portions 56 and 57 are obtained. , 57a can be adjusted. Moreover, if the bolts 70d and 71d are removed, the water cooling walls 70 and 71 can be removed, and the exchangeable shoe 65 can be replaced from the furnace side wall through the space from which the water cooling walls 70 and 71 are removed.

  The support portions 56 and 57 of the movable grate 43B and the support portions 51 and 52 of the fixed grate 43A are located in the boxes 72 and 73 attached to the side walls 54 and 55 of the furnace. Can be accommodated (FIGS. 3 and 4). The boxes 72 and 73 are purged with an inert gas or a self-exhaust gas, so that intrusion of furnace gas can be prevented.

  3, 4, 9, and 10, the movable grate 43 </ b> B is connected to sliding bodies 60 b and 61 b guided by guide rails 60 a and 61 a fixed in the boxes 72 and 73. Extrusion rods 60c and 61c connected to the sliding bodies 60b and 61b pass through the boxes 72 and 73, and are connected to the driving device 81 (see FIG. 2). The support portions 56b and 57b of the movable grate 43B are connected to the boxes 72 and 73, respectively. Move back and forth in 73. The cooling water pipes 68a and 68b connected to the cooling water flow path 63 of the movable grate 43B extend through the left and right boxes 72 and 73 so as to be slidable.

  According to the reduction furnace 15A having the above-described configuration, the reduced iron raw material A input from the input port 41 is pushed out onto the grate 43 by the pusher 42, and the movable grate 43B moves back and forth by driving the driving device 81. Thus, the reduced iron raw material A is conveyed on the downstream side of the grate 43 and reduced metallized by the high temperature gas B supplied from the lower part of the grate 43 and the reducing gas by the plastic component. In the case of a stoker furnace as shown in FIG. 2, the amount of fly ash generated can be suppressed because large drop stirring is not performed unlike a kiln furnace.

  The water-cooled movable grate used in the reduction furnace is, instead of the above-described form, for example, as shown in FIG. 11, left and right support portions 56 ′, 57 ′ of the movable grate 43B ′ are convex in plan view. It is also possible to adopt a configuration in which water-cooled walls 70 ′ and 71 ′ that are castable and can be adjusted in the furnace width direction and can be removed from the side surfaces 56n and 57n excluding the convex pieces 56m and 57m.

  Further, in place of the stoker-type reducing furnace of the above-described embodiment, a stoker-type combined furnace in which the post-combustion stoker of the final stage (post-combustion stage) of a general stoker incinerator is replaced with the same structure as the stoker-type reducing furnace. Can also be adopted. That is, as shown in FIG. 12, the stoker type combined furnace 100 includes a dry stoker 102 having an air-cooled grate 101 and a water-cooled stoker 104 having a frame-integrated water-cooled grate 43 at the rear stage of the combustion stoker 103, and is air-cooled. The dry stoker 102 and the combustion stoker 103 are supplied with combustion air E from the lower part thereof, and the lower part of the frame-integrated water-cooled grate 43 is supplied with a reducing gas B having a high temperature (about 1100 to 1300 ° C.) and a low oxygen concentration. It is configured to supply. The frame-integrated water-cooled grate can adopt the same configuration as that shown in FIGS. The stoker type combined furnace 100 can include a heating burner 106 for heating the inside of the upper furnace of the water-cooled stalker 104, and a reducing agent supply device 107 for supplying a reducing agent to the upstream portion of the water-cooled stalker 104. Can be provided.

  According to the stoker type combined furnace 100 having such a configuration, combustible waste introduced from the inlet 105 is dried by the dry stoker 102, burned by the combustion stoker 103 to become incinerated ash, and then heated at the water-cooled stoker 104. Iron oxide in the incineration ash is reduced by the reducing gas.

  As described above, the stoker-type combined furnace 100 utilizes the sensible heat of the incinerated ash incinerated by the dry stoker 102 and the combustion stoker 103, and further reduces the temperature of the water-cooled stoker 104 from the bottom of the frame-integrated water-cooled grate 43 at a high temperature. By supplying gas, it is possible to efficiently reduce the magnetic substance (iron oxide) in the incineration ash.

  In the case of the stoker-type combined furnace 100, when firing is intended, the high-temperature gas supplied from the lower part of the frame-integrated water-cooled grate 43 does not have to be a reducing gas. A reduction furnace for reduction treatment is additionally provided. The burning of the incineration ash by the conventional general water-cooled stoker type incinerator is one-way heating from the upper surface of the grate, and the incineration ash becomes a heat insulating layer and has poor heat conduction efficiency, but the stoker type as shown in FIG. In the case of a combined furnace, since gentle stirring and high-temperature gas supply from the lower part of the stoker are added, the burning rate of incineration ash increases, which greatly contributes to the reduction of external fuel.

  The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the spirit of the present invention.

1 Garbage Treatment Facility 2 Garbage Incinerator 3 Incineration Ash 4 Magnetic Sorting Machine 5 Magnetic Material (Iron Oxide)
6 Non-magnetic material (incineration ash)
7 Melting furnace 8 Slag 9 Molten fly ash 10 Crusher 11 Sieve 15, 15A Reduction furnace 20 Sorting treatment facility 30 Recycling facility 43 Frame-integrated water-cooled grate 43A Fixed grate 43B Movable grate 56, 57, 51, 52 53, 58 Connecting portion 53a, 58a Fireproof protective layer 63, 64 Cooling water flow path

Claims (13)

A waste incinerator, a magnetic separator for magnetically sorting magnetic materials from the incinerated ash discharged from the waste incinerator, and a reduction furnace for reducing metallization of the magnetic materials sorted by the magnetic separator Characteristic waste treatment facility. The refuse disposal facility according to claim 1, further comprising a mixing / molding machine that mixes and forms waste plastic with the magnetic material before putting the magnetic material into a reduction furnace. 3. A crusher for crushing the magnetic material before mixing the magnetic material with waste plastic, and a sieve for screening the magnetic material crushed by the crusher to a predetermined particle size or less. Waste treatment facility described in 1. The waste treatment facility according to any one of claims 1 to 3, further comprising an exhaust gas treatment facility for treating the exhaust gas of the reduction furnace together with the exhaust gas of the waste incinerator. The waste treatment facility further includes a melting furnace for melting the non-magnetic material selected by the magnetic separator, and further includes an exhaust gas treatment facility for processing the exhaust gas of the reduction furnace together with the exhaust gas of the melting furnace. The refuse disposal facility according to any one of claims 1 to 4. The reduction furnace includes a water-cooled stoker provided with a frame-integrated water-cooled grate and supplied with high-temperature reducing gas from the lower part of the frame-integrated water-cooled grate,
The frame-integrated water-cooled grate is integrally formed with a pair of left and right support portions that extend through the left and right furnace walls and a connection portion that connects between the pair of support portions, and has a fire resistance on the surface of the connection portion. The protective layer is provided, a cooling water flow path communicating the support portion and the connecting portion is formed inside, and a cooling water inlet / outlet portion is provided in a furnace wall outer side portion of the support portion. Garbage disposal facility described in any one. A drying stoker supplied with air from the lower part of the grate, a combustion stoker arranged at the rear stage of the drying stoker and supplied with air from the lower part of the grate, and a water-cooled grate integrated with a frame arranged at the rear stage of the combustion stoker And a water-cooled stoker supplied with high-temperature gas from the lower part, and a stoker-type combined furnace comprising:
The frame-integrated water-cooled grate is integrally formed with a pair of left and right support portions that extend through the left and right furnace walls and a connection portion that connects between the pair of support portions, and has a fire resistance on the surface of the connection portion. The stoker type combined furnace is provided with a protective layer, a cooling water flow path communicating with the support portion and the connection portion is formed therein, and a cooling water inlet / outlet portion is provided at a portion outside the furnace wall of the support portion. A waste disposal facility. A process for incinerating combustible waste in a waste incinerator, a magnetic separation process for magnetically sorting magnetic materials from the incineration ash discharged from the waste incinerator, and a reduction metallization treatment for magnetic materials selected by the magnetic separation process in a reduction furnace A waste disposal method comprising the steps of: The waste treatment method according to claim 8, wherein waste plastic is used as a reducing agent in the reduction metallization treatment. 10. The waste disposal method according to claim 9, wherein waste plastic is mixed with the magnetic material and molded into pellets. The crushing step of crushing the magnetic material with a crusher before mixing the magnetic material with waste plastic, and a sieving step of sieving the crushed magnetic material to a predetermined particle size or less. 10. The waste disposal method according to 10. The waste treatment method according to any one of claims 8 to 11, further comprising an exhaust gas treatment step of treating the exhaust gas of the reduction furnace together with the exhaust gas of the waste incinerator. A melting treatment step of treating the non-magnetic material magnetically sorted in the magnetic separation step in a melting furnace, and an exhaust gas treatment step of treating the exhaust gas of the reduction furnace together with the exhaust gas of the melting furnace. The garbage disposal method according to any one of claims 8 to 12.