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WO2024043187A1 - Élément foyer, procédé de production d'élément foyer - Google Patents

Élément foyer, procédé de production d'élément foyer Download PDF

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Publication number
WO2024043187A1
WO2024043187A1 PCT/JP2023/029843 JP2023029843W WO2024043187A1 WO 2024043187 A1 WO2024043187 A1 WO 2024043187A1 JP 2023029843 W JP2023029843 W JP 2023029843W WO 2024043187 A1 WO2024043187 A1 WO 2024043187A1
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WO
WIPO (PCT)
Prior art keywords
mass
protective layer
hearth component
hearth
component according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/029843
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English (en)
Japanese (ja)
Inventor
創 村末
栄司 石川
正実 香島
俊介 瀧川
健太 宇山
雄介 福士
徹 呉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Ebara Environmental Plant Co Ltd
Original Assignee
Ebara Corp
Ebara Environmental Plant Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Corp, Ebara Environmental Plant Co Ltd filed Critical Ebara Corp
Priority to JP2024542796A priority Critical patent/JPWO2024043187A1/ja
Priority to CN202380061648.7A priority patent/CN119790267A/zh
Publication of WO2024043187A1 publication Critical patent/WO2024043187A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • B23K26/342—Build-up welding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23H—GRATES; CLEANING OR RAKING GRATES
    • F23H17/00—Details of grates
    • F23H17/12—Fire-bars

Definitions

  • the present disclosure relates to hearth components and methods of manufacturing hearth components.
  • the grate is a hearth component placed at the bottom of the incinerator, and by moving it back and forth, it has the role of stirring and transporting waste while incinerating it.
  • the material of the grate is usually SCH2, which is a heat-resistant cast steel, and is mainly manufactured by casting.
  • Japanese Patent No. 6730814 proposes a fire grate manufactured by joining plate materials having a first alloy layer and a second alloy layer to each other by welding.
  • Incinerators contain a mixture of incinerated ash and non-combustible materials, and the grate thins due to corrosion due to chlorine in the garbage and wear due to contact with hard non-combustible materials.
  • the lifespan of a grate is said to be about 3 to 6 years. In order to continue using an incinerator, it is necessary to replace the grate periodically, but since each grate is quite heavy, the cost of replacing it is high. Therefore, there is a need to extend the life of the grate.
  • the grate body is made of cast iron or high Cr cast steel, and the surface of the hanging part of the grate body that hangs down from at least one end of the flat part for transporting garbage is made of Co-based alloy. It has been proposed to perform plasma overlay welding of wear-resistant materials.
  • a hearth component includes: A hearth component having an in-furnace exposed surface exposed in an incinerator, The in-furnace exposed surface has a front surface and a top surface, At least the front surface is provided with a protective layer having grooves formed on its surface.
  • a method for manufacturing a hearth component includes: A hearth component having an in-furnace exposed surface exposed in an incinerator, wherein the in-furnace exposed surface has a front surface and an upper surface, and at least the front surface has a protective layer with grooves formed on the surface.
  • a method for manufacturing a hearth component comprising: The method includes the step of forming the protective layer on the main body made of a casting or a plate material by laser overlay welding.
  • FIG. 1A is a schematic diagram showing the configuration of an incineration facility according to an embodiment.
  • FIG. 1B is a diagram showing a schematic configuration of the bottom of an incinerator according to an embodiment.
  • FIG. 2 is a perspective view showing a schematic configuration of hearth components according to an embodiment.
  • FIG. 3 is a photograph of a hearth component according to one embodiment taken from diagonally above the front.
  • FIG. 4 is an enlarged photograph of the front surface of the hearth component according to one embodiment.
  • FIG. 5 is a diagram showing a cross section of the protective layer of the hearth component according to one embodiment, taken along a plane perpendicular to the direction in which the grooves extend.
  • FIG. 6 is a graph showing the test results of a corrosion wear resistance test on the protective layer of the hearth component.
  • FIG. 7 is a perspective view showing a schematic configuration of a hearth component according to a modified example of an embodiment.
  • FIG. 8 is an enlarged view of the protector in the hearth component shown in FIG. 7.
  • FIG. 9 is a perspective view showing a modified example of the hearth component shown in FIG. 2.
  • FIG. 10 is a perspective view showing a modified example of the hearth component shown in FIG. 7.
  • the hearth component according to the first aspect of the embodiment is: A hearth component having an in-furnace exposed surface exposed in an incinerator,
  • the in-furnace exposed surface has a front surface and a top surface, At least the front surface is provided with a protective layer having grooves formed on its surface.
  • the protective layer is provided on at least the front surface of the exposed inside of the hearth component, the front surface of the hearth component main body is protected from corrosive gases and non-combustible materials in the incinerator. This prevents thinning due to corrosion caused by chlorine in garbage or wear caused by contact with hard, non-combustible materials.
  • grooves are formed on the surface of the protective layer, and corrosion products are peeled off due to wear on the ridge line between the grooves, but the peeled off microparticles, ash, small-sized incombustibles, etc.
  • the inner surface of the groove By depositing on the inner surface of the groove, the inner surface of the groove is no longer directly exposed to corrosive gas in the incinerator or large incombustible materials that affect wear, making it difficult for thinning due to corrosion and wear to occur. Therefore, the amount of thinning of the entire protective layer can be suppressed. Therefore, it is possible to extend the life of the hearth components.
  • the protective layer By combining the protective layer with an air-cooled or water-cooled structure that cools the hearth components, the protective layer becomes below the metal temperature at which thinning due to corrosion or wear hardly occurs, making it possible to further extend the life.
  • the amount of thinning of hearth components it is generally difficult to measure the amount of thinning of hearth components, and the amount of thinning relative to other hearth components is basically evaluated, but corrosion resistance and Hearth component parts overlaid with abrasive alloys have a small amount of thinning, and it is difficult to judge by relative evaluation how much thinning has occurred in the overlaid layer.
  • the grooves are formed on the surface of the protective layer, the amount of thinning can be visually confirmed, and the rough lifespan of the hearth components can be determined.
  • the depth of the groove it becomes possible to easily determine the timing of replacement or repair.
  • the hearth component according to the second aspect of the embodiment is the hearth component according to the first aspect,
  • the protective layer is also provided on at least a portion of the upper surface on the front side.
  • the protective layer since the protective layer is also provided on the upper surface of the furnace-exposed surface of the hearth component, the protective layer prevents thinning of the grate body also on the upper surface.
  • the protective layer since the protective layer has grooves formed on its surface, the overall amount of thinning of the protective layer can be suppressed. This makes it possible to further extend the life of the hearth components.
  • the hearth component according to the third aspect of the embodiment is the hearth component according to the first or second aspect,
  • the width of the groove is 5 mm or less.
  • the average size of non-combustible materials (hard non-combustible materials, etc.) that affect wear is about 5 mm. Therefore, if the width of the groove is wider than 5 mm, not only will it be difficult for microparticles, ash, small incombustibles, etc. to accumulate in the groove, but also it will be easy to collide with hard incombustibles, etc. on the entire surface. On the other hand, according to the third aspect, since the width of the groove is 5 mm or less, hard incombustible materials are less likely to collide with the inner surface of the groove, and the inner surface of the groove is less likely to be worn out. This makes it possible to further extend the life of the hearth components.
  • the hearth component according to the fourth aspect of the embodiment is the hearth component according to any one of the first to third aspects,
  • the protective layer contains, when the entire protective layer is 100% by mass, Cr from 10% by mass to 50% by mass, Fe from 0% by mass to 50% by mass, Mo from 0% by mass to 10% by mass, Si: 0 mass% to 5 mass%, C: 0.05 mass% to 1 mass%, Cu: 0 mass% to 5 mass%, Co: 0 mass% to 1 mass%, B: 0 mass% % or more and 7% by mass or less, with the remainder being Ni and unavoidable impurities.
  • the corrosion resistance and wear resistance of the protective layer are improved, so that the life of the hearth component can be further extended.
  • the hearth component according to the fifth aspect of the embodiment is the hearth component according to any one of the first to fourth aspects,
  • the thickness of the protective layer is 1.0 to 1.2 mm.
  • the hearth component according to the sixth aspect of the embodiment is the hearth component according to any one of the first to fifth aspects,
  • the depth of the groove is 0.2 to 0.4 mm.
  • the hearth component according to the seventh aspect of the embodiment is the hearth component according to any one of the first to sixth aspects,
  • the protective layer is formed by laser overlay welding.
  • the amount of heat input is smaller than in plasma build-up welding or arc build-up welding, so (base material) thermal deformation and dilution can be suppressed.
  • the material of the main body (base metal) made of cast iron is SCH2, which has poor weldability, the base metal will crack in plasma build-up welding or arc build-up welding unless it is preheated. The problem is that it takes time and cost.
  • the protective layer by laser overlay welding, we can omit the normally necessary preheating and suppress cracks in the cast body (base metal) and the protective layer (overlay material). can do. Furthermore, grooves can be easily formed on the surface of the protective layer during construction, and there is no need for machining after construction.
  • the hearth component according to the eighth aspect of the embodiment is the hearth component according to any one of the first to seventh aspects, It has a main body made of cast metal, or a main body made of a plate material whose front and upper surfaces have a first alloy layer and a second alloy layer.
  • the material of the main body made of casting may be SCH2.
  • the material of the first alloy layer of the main body made of a plate material is, for example, a 5-6C-28-32Cr-2-3Nb-3-5W alloy, which has higher heat resistance, corrosion resistance, and/or wear resistance than the second alloy layer. It may be an alloy with properties.
  • the material of the second alloy layer may be a general structural rolled steel plate or a stainless steel plate that has excellent weldability.
  • the hearth component according to the ninth aspect of the embodiment is the hearth component according to any one of the first to eighth aspects, having a side surface in contact with the front surface and the top surface,
  • the protective layer is also provided on at least a portion of the front side of the side surface,
  • the thickness of the protective layer on the side surface is thinner than the thickness of the protective layer on the front surface.
  • the hearth component according to the tenth aspect of the embodiment is the hearth component according to any one of the first to ninth aspects,
  • the protective layer is formed directly on the surface of the main body made of cast metal or plate material.
  • the hearth component according to the eleventh aspect of the embodiment is the hearth component according to any one of the first to eighth aspects, It further includes a removable protector on the front and top surfaces of the main body made of cast metal or plate material, The protective layer is formed on the surface of the protector.
  • the hearth component according to the twelfth aspect of the embodiment is the hearth component according to the eleventh aspect,
  • the material of the protector is SUS.
  • the grate according to the thirteenth aspect of the embodiment is a grate made of the hearth component according to any one of the first to twelfth aspects.
  • the side grate according to the fourteenth aspect of the embodiment is a side grate made of the hearth component according to any one of the first to twelfth aspects.
  • the seal block according to the fifteenth aspect of the embodiment is a seal block made of the hearth component according to any one of the first to twelfth aspects.
  • the protector according to the sixteenth aspect of the embodiment is A hearth component having an in-furnace exposed surface exposed in an incinerator, wherein the in-furnace exposed surface has a front surface and an upper surface, and at least the front surface has a protective layer with grooves formed on the surface.
  • the incineration facility includes the hearth component according to any one of the first to twelfth aspects.
  • the method for manufacturing a hearth component according to the eighteenth aspect of the embodiment includes: A hearth component having an in-furnace exposed surface exposed in an incinerator, wherein the in-furnace exposed surface has a front surface and an upper surface, and at least the front surface has a protective layer with grooves formed on the surface.
  • a method for manufacturing a hearth component comprising: The method includes the step of forming the protective layer on the main body made of a casting or a plate material by laser overlay welding.
  • FIG. 1A is a schematic diagram showing the configuration of an incineration facility 10 according to an embodiment.
  • the incineration facility 10 includes a platform 21 on which a transport vehicle (garbage collection vehicle) 22 loaded with waste stops, a garbage pit 3 in which the waste input from the platform 21 is stored, and a garbage pit 3 where the waste is stored.
  • a crane 5 that stirs and transports the waste stored in the pit 3, a hopper 4 into which the waste transported by the crane 5 is thrown, and an incinerator 1 that incinerates the waste thrown from the hopper 4.
  • the incinerator 1 includes an exhaust heat boiler 2 that recovers exhaust heat from exhaust gas generated within the incinerator 1.
  • the structure of the garbage pit 3 is not limited to a single-stage pit as shown in FIG. 1A, but also includes a two-stage pit.
  • the waste loaded on the transport vehicle 22 is thrown into the garbage pit 3 from the platform 21 and stored in the garbage pit 3.
  • the waste stored in the garbage pit 3 is stirred by the crane 5 and transported to the hopper 4 by the crane 5, and is thrown into the incinerator 1 through the hopper 4. Disposed of by incineration.
  • FIG. 1B is a diagram showing a schematic configuration of the bottom of the incinerator 1.
  • the type of incinerator 1 is a stoker furnace. 14 are arranged alternately and in a step-like manner along the flow direction of the waste. Note that in FIG. 1B, only one furnace wall 11 is depicted. An end grate 16 is disposed at the upstream ends of these grates 12, 14.
  • the fixed grate 12 is fixed to a fixed frame 18, and the movable grate 14 is fixed to a movable frame 26 which reciprocates via wheels 22 and rails 24 in response to the operation of a hydraulic cylinder 20.
  • a scraper 28 is attached to the fixed grate 12 and the movable grate 14, which slides on the upper surface of the fixed grate 12 or the movable grate 14 located below.
  • a pair of side grates 30 are arranged at positions facing each of the end faces of the fixed grate 12, the movable grate 14, and the end grate 16 of the furnace wall 11, and a seal is placed above each side grate 30.
  • a block 32 (also referred to as a side seal) is arranged. In FIG. 1, only one side grate 30 and one seal block 32 arranged above this grate are depicted.
  • the movable grate 14 As a result, as the movable grate 14 reciprocates, the waste (garbage) input from the waste hopper 4 (see FIG. 1A) is stirred and sequentially sent downward to be burned. At this time, the end faces of the fixed grate 12, the movable grate 14, and the end grate 16 come into pressure contact with the surface of the side grate 30 to seal it, and the gap between the side grate 30 and the furnace wall 11 is The seal block 32 is designed to seal.
  • the grates 12, 14, the side grates 30, and the seal block 32 each have an in-furnace exposed surface that is exposed in the incinerator 1, and the in-furnace exposed surface is the front surface 61a. and an upper surface 61b (see FIG. 2 described later).
  • the front surface of the side grate 30 faces the end surfaces (side surfaces) of the grate 12 and 14.
  • one or more of the fire grates 12, 14, the side grate 30, and the seal block 32 may be comprised of the hearth component 6 described later. good.
  • the hearth component 6 may be air-cooled or water-cooled.
  • the air-cooling or water-cooling structure for cooling the hearth component 6 for example, the structure described in Japanese Patent No. 3838639 can be adopted.
  • the hearth component 6 that constitutes the grates 12 and 14 will be explained as a representative.
  • the hearth component has an exposed surface inside the incinerator 1, The technology according to this embodiment can be applied without being limited to.
  • FIG. 2 is a perspective view showing a schematic configuration of the hearth component 6 according to the present embodiment.
  • FIG. 3 is a photograph of the hearth component 6 taken diagonally from above, and
  • FIG. 4 is a photograph of the front surface of the hearth component 6 enlarged.
  • the hearth component 6 has a main body 61 made of cast metal or plate material, and a protective layer 62.
  • heat-resistant cast steel such as SCH2 may be used as the material of the main body 61 made of a cast metal.
  • the plate material may have a second alloy layer and a first alloy layer located closer to the in-furnace exposed surface than the second alloy layer.
  • a 5 ⁇ 6C-28 ⁇ 32Cr-2 ⁇ 3Nb-3 ⁇ 5W alloy may be used as the material of the second alloy layer.
  • a general structural rolled steel plate or a stainless steel plate having excellent weldability may be used.
  • the protective layer 62 is provided on at least the front surface 61a of the main body 61 made of cast metal or plate material. Since the protective layer 62 is provided on the front surface 61a of the main body 61 made of cast metal or plate material, the portion of the front surface 61a of the grate main body 61 covered with the protective layer 62 is protected against corrosive gas in the incinerator 1. It is not directly exposed to non-combustible materials and prevents thinning due to corrosion caused by chlorine in garbage or wear caused by contact with hard non-combustible materials.
  • the protective layer 62 is provided so as to cover the entire front surface 61a of the main body 61 made of cast metal or plate material, but the protection layer 62 is not limited to this. 9, it may be provided except for the lower part of the front surface 61a.
  • the protective layer 62 covers a range of 50% or more from the top (excluding a range of less than 50% from the bottom) when the entire front surface 61a of the main body 61 made of casting or plate material is taken as 100%. It may be provided in the range of 80% or more (i.e., excluding the range less than 20% from the bottom), or it may be provided in the range of 90% or more (i.e., excluding the range less than 10% from the bottom).
  • the protective layer 62 may be provided in a range of 95% or more (that is, excluding a range of less than 5% from the bottom).
  • the protective layer 62 is provided on the entire front surface 61a of the hearth component 6, the lower end of the protective layer 6 comes into contact with the upper surface of the hearth component 6 below. As it is moved back and forth, the top surface of the lower hearth components can be scraped.
  • the protective layer 62 is provided on the front surface 61a of the hearth component 6 except for the lower part, the lower end of the protective layer 6 is connected to the upper surface of the lower hearth component. Since they do not contact each other, thinning of the upper surface of the lower hearth component can be suppressed.
  • the protective layer 62 may also be provided on at least a portion of the upper surface 61b of the main body 61 made of cast metal or plate material on the front surface 61a side.
  • the upper surface 61b of the grate body 61 is also not directly exposed to corrosive gas or incombustibles in the incinerator 1, and thinning due to corrosion or wear is prevented.
  • the "portion on the front surface 61a side" may be a range of 15% or less from the front surface 61a side, or a range of 10% or less, when the entire upper surface 61b is taken as 100%. The range may be 8% or less.
  • grooves 63 are formed on the surface of the protective layer 62.
  • a plurality of linear grooves 63 parallel to the left-right direction are formed in a line so as to be adjacent to each other in the vertical direction, and are formed so as to cover the surface of the protective layer 62.
  • planar pattern of the grooves 63 is not limited to this, for example, a plurality of wavy grooves 63 meandering along the left-right direction may be formed side by side so as to be adjacent to each other in the vertical direction, A plurality of grooves 63 having a rectangular shape with gradually different sizes may be formed concentrically, or one groove 63 may be formed in a rectangular spiral shape extending from the center to the outer edge. good.
  • FIG. 5 is a diagram showing a cross section of the protective layer 62 taken along a plane (line AA in FIG. 4) perpendicular to the direction in which the grooves extend.
  • the grooves 63 are formed on the surface of the protective layer 62, corrosion products are peeled off due to wear at the ridge line 64 between the grooves 63, but the peeled off minute particles As particles, ash, small-sized noncombustibles, etc. accumulate on the inner surface of the groove 63, the inner surface of the groove 63 is also directly exposed to corrosive gas in the incinerator 1 and large-sized noncombustibles that affect wear. This prevents thinning due to corrosion and wear. Therefore, the amount of thinning of the entire protective layer 62 can be suppressed.
  • the amount of thinning of hearth components In general, it is difficult to measure the amount of thinning of hearth components, and the amount of thinning relative to other hearth components is basically evaluated, but corrosion resistance and wear resistance The amount of thinning of the hearth components overlaid with the alloy having the above-mentioned properties is small, and it is difficult to determine how much the overlaid layer has thinned by relative evaluation.
  • the grooves 63 since the grooves 63 are formed on the surface of the protective layer 62, the amount of thinning can be visually confirmed, and the rough lifespan of the hearth component 6 can be determined. It has the advantage of being possible. Further, by adjusting the depth D2 of the groove 63, it becomes possible to easily determine the timing for replacing or repairing the grate 6.
  • the time when the groove 63 disappeared is 6 years. Assuming that, it can be determined that the useful life is about 10 years remaining.
  • the thickness D1 of the protective layer 62 may be, for example, 1.0 to 1.2 mm.
  • the depth D2 of the groove 63 can be adjusted as appropriate depending on the timing of replacement or repair, and may be, for example, 0.2 to 0.4 mm.
  • the width D3 of the groove 63 may be 5 mm or less.
  • the width D3 of the groove 63 refers to the distance between two adjacent ridgelines 64.
  • the width D3 of the groove 63 is equal to the center distance between two adjacent grooves 63.
  • the width D3 of the groove 63 is 5 mm or less as in this embodiment, the incombustibles in the garbage are less likely to collide with the inner surface of the groove 63, so that the inner surface of the groove 63 is more likely to be worn out. It becomes difficult.
  • the grate body 61 has a side surface 61c in contact with the front surface 61a and the upper surface 61b, and the protective layer 62 may also be provided on at least a portion of the side surface 61c of the grate body 61 on the front surface 61a side.
  • the thickness of the protective layer 62 on the side surface 61c may be thinner than the thickness of the protective layer 62 on the front surface 61a.
  • the material of the protective layer 62 is not particularly limited as long as it has corrosion resistance and wear resistance, but for example, when the entire protective layer is 100% by mass, Cr is 10% by mass or more and 50% by mass.
  • Fe is 0 mass% to 50 mass%
  • Mo is 0 mass% to 10 mass%
  • Si is 0 mass% to 5 mass%
  • C is 0.05 mass% to 1 mass%
  • Cu is An alloy composition consisting of 0 mass% or more and 5 mass% or less, Co containing 0 mass% or more and 1 mass% or less, B 0 mass% or more and 7 mass% or less, and the balance consisting of Ni and unavoidable impurities (hereinafter referred to as the first alloy composition). ).
  • the reason for each element in the first alloy composition will be explained below.
  • Cr 10% by mass or more and 50% by mass or less
  • the content of Cr may be 10% by mass or more and 50% by mass or less, preferably 10% by mass or more and 35% by mass or less, and more preferably 15% by mass or more and 25% by mass or less.
  • Cr is an essential element for maintaining corrosion resistance at high temperatures, and if it is less than 10% by mass, sufficient corrosion resistance cannot be exhibited. Cr forms precipitates (Cr boride and Cr carbide) with B and C, thereby increasing the hardness of the protective layer 63 and improving its wear resistance.
  • the upper limit is preferably 50% by mass.
  • Ni 0 mass% or more and 70 mass% or less
  • the content of Ni may be 0% by mass or more and 70% by mass or less, preferably 50% by mass or less.
  • Ni is known to have excellent corrosion resistance, especially high-temperature chloride corrosion properties, and it is generally believed that the higher the Ni content, the better the material properties.
  • Ni since Ni is expensive, it is desirable to reduce the amount added from the viewpoint of cost. Based on the corrosion test results of Ni-Fe-Cr alloys, the applicant found that when the partial pressure of chlorine is low, the corrosion resistance is improved when Ni is included, and when the Ni content exceeds 70% by mass, the corrosion resistance is improved. was found to be significantly reduced. Therefore, the upper limit of the Ni content is 70% by mass.
  • Mo 0% by mass or more and 10% by mass or less
  • the content of Mo may be 0% by mass or more and 10% by mass or less, preferably 0% by mass or more and 3% by mass or less, or 3% by mass or more and 5% by mass or less.
  • Alloy 625 containing 9% by mass of Mo exhibits excellent corrosion resistance in a chloride corrosive environment such as a garbage incinerator.
  • the Mo content exceeds 10% by mass, the corrosion resistance deteriorates.
  • workability also deteriorated.
  • reducing the Mo content resulted in suppressing the amount of thinning, albeit slightly.
  • the Mo content When attaching importance to workability and corrosion and wear resistance, it is preferable to suppress the Mo content to 0 mass% or more and 3 mass% or less, and when emphasis is placed on corrosion resistance, it is preferably 3 mass% or more and 5 mass% or less. preferable.
  • C 0.05% by mass or more and 1% by mass or less
  • the content of C may be 0.05% by mass or more and 1% by mass or less, preferably 0.3% by mass or more and 0.7% by mass or less.
  • C forms hard Cr carbide, it is generally used to improve the hardness of the protective film.
  • a precipitated phase mainly composed of Cr carbides protrudes and contributes to improving corrosion and wear resistance by alleviating the wear experienced by the base material. If the C content is less than 0.05% by mass, precipitation of the Cr carbide phase will be insufficient, but if it exceeds 1% by mass, Cr in the base material will be consumed too much as carbide, and corrosion resistance may deteriorate. be.
  • Cu 0% by mass or more and 5% by mass or less
  • the content of Cu may be 0% by mass or more and 5% by mass or less.
  • Corrosion resistance can be improved by adding Cu to a Ni-based self-fusing alloy.
  • Co 0% by mass or more and 1% by mass or less
  • the Co content may be 0% by mass or more and 1% by mass or less.
  • the parent phase ⁇ Ni can be strengthened.
  • the upper limit is preferably 1% by mass.
  • B 0% by mass or more and 10% by mass or less
  • the content of B may be 0% by mass or more and 10% by mass or less, preferably 2% by mass or more and 7% by mass or less, and more preferably 5% by mass or more and 6% by mass or less.
  • B is an essential element for workability (remelting property), and also forms Cr boride in the base alloy to contribute to hardening of the alloy.
  • the alloy in which the Cr boride is formed is exposed to a corrosive environment, corrosion products are formed on the metal base material.
  • wear involved here, the corrosion products are damaged, the corrosion rate increases, and as a result, the thinning of the base material is accelerated.
  • Cr boride which is hard and has excellent wear resistance, protrudes and is preferentially bombarded with ash and incombustibles, which is thought to alleviate the wear conditions on the base metal and suppress the amount of thinning of the base metal. It will be done. However, if the content of B is too high, Cr will be consumed as boride, which will reduce the corrosion resistance of the base material and make the base material too hard and brittle. Therefore, it is preferable to keep the upper limit at 10% by mass. . Although Cr carbide has a similar function, it is Cr boride that plays a major role in the above alloy composition.
  • Si 0 mass% or more and 5 mass% or less
  • the content of Si may be 0 mass% or more and 5 mass% or less, preferably more than 0 mass% and 2 mass% or less, and more preferably 0.1 mass% or more and 1.5 mass% or less. It is known that Si contributes to improving oxidation resistance. However, it has been found that when the content of Si is high, the corrosion and wear resistance decreases, and the corrosion resistance decreases in an environment containing a trace amount of chlorine. As described above, it is preferable not to contain Si from the viewpoints of corrosion resistance, wear resistance, and corrosion resistance. Therefore, it is preferable to add Si to an upper limit of 5%.
  • the protective layer 62 is formed directly on the surface of the main body 61 made of cast metal or plate material.
  • the protective layer 62 may be formed on the main body 61 made of a casting or a plate material by laser overlay welding (also referred to as laser cladding).
  • laser overlay welding also referred to as laser cladding
  • thermal deformation and dilution of the main body 61 (base material) made of a cast or plate material can be suppressed.
  • the material of the main body 61 (base metal) made of cast metal is SCH2, which has poor weldability, the base metal will crack in plasma build-up welding or arc build-up welding unless it is preheated.
  • the problem is that it is time consuming and costly.
  • the protective layer 62 by forming the protective layer 62 by laser overlay welding, the normally necessary preheating can be omitted, while the main body 61 (base metal) made of cast metal and the protective layer 62 (overlay material) can be formed by laser overlay welding. Cracking can be suppressed.
  • the protective layer 62 is formed by laser overlay welding, the grooves 63 can be easily formed on the surface of the protective layer 62 during construction, so additional machining is required to form the grooves 63 after construction. The advantage is that you don't have to.
  • the hearth component 6 further includes a protector 65 that is removable from the front surface 61a and top surface 61b of the main body 61 made of cast metal or plate material.
  • the layer 62 may be formed on the surface of the protector 65.
  • the material of the protector 65 may be, for example, SUS material.
  • the protective layer 62 may be formed on the surface of the protector 65 by laser overlay welding (laser cladding). In this case, since the amount of heat input is smaller than in plasma build-up welding or arc build-up welding, thermal deformation and dilution of the protector 65 (base material) can be suppressed.
  • the protective layer 62 is formed by laser overlay welding, the grooves 63 can be easily formed to cover the surface of the protective layer 62 during construction. The advantage is that there is no need for mechanical processing.
  • a method for manufacturing the hearth component 6 according to a modified example will be described. First, as shown in FIG. 8, a protective layer 62 is formed on the surface of the protector 65. Next, as shown in FIG. 7, the protector 65 and the main body 61 made of cast metal or plate material are connected by welding. In this way, the hearth component 6 according to a modified example is manufactured.
  • the hearth component 6 according to the first modification when the protective layer 62 is thinned, the hearth component 6 can be removed from the incinerator 1 by cutting out the welded portion and replacing it with a new protector 65. There is an advantage that the protective layer 62 can be replaced without any need for replacement.
  • the protective layer 62 is formed to cover the entire front surface 61a of the protector 65, but the protection layer 62 is not limited to this, and for example, as shown in FIG. , may be formed except for the lower part of the front surface 61a.
  • the protective layer 62 may be provided in a range of 50% or more from the top (i.e., excluding a range of less than 50% from the bottom) when the entire front surface 61a of the protector 65 is taken as 100%.
  • the protective layer 62 When the protective layer 62 is provided on the entire front surface 61a of the protector 65, the lower end of the protective layer 6 comes into contact with the upper surface of the lower hearth component, thereby preventing the hearth to which the protector 65 is attached. When the component 6 is moved back and forth, the top surface of the underlying hearth component may be scraped.
  • the protective layer 62 is provided on the front surface 61a of the protector 65 except for the lower part, the lower end of the protective layer 6 does not come into contact with the upper surface of the hearth component below. Therefore, thinning of the upper surface of the lower hearth component can be suppressed.
  • the protective layer 62 is provided on at least the front surface 61a of the surfaces exposed in the furnace of the hearth component 6, the front surface 61a of the main body 61 made of casting or plate material is There is no direct exposure to corrosive gas or non-combustible materials in the incinerator 1, and thinning due to corrosion caused mainly by chlorine in the garbage or wear due to contact with hard non-combustible materials is prevented.
  • grooves 63 are formed on the surface of the protective layer 62, and corrosion products are peeled off due to wear at the ridge line 64 between the grooves 63, but the peeled off microparticles, ash, and size As small incombustibles and the like accumulate on the inner surface of the groove 63, the inner surface of the groove 63 is no longer directly exposed to corrosive gas in the incinerator 1 and large incombustibles that affect wear. Since thinning due to wear and tear is less likely to occur, the amount of thinning in the entire protective layer 62 can be suppressed. Therefore, the life of the hearth component 6 can be extended.
  • the grooves 63 are formed on the surface of the protective layer 62, the amount of thinning can be visually confirmed, and the rough lifespan of the hearth component 6 can be determined. There are advantages. Furthermore, by adjusting the depth D2 of the groove 63, it becomes possible to easily determine the timing of replacement or repair.
  • Ni-based developed material SFNi4, Inconel (registered trademark) 625, Stellite (registered trademark) 21, and DHECR-TB2 (registered trademark)
  • overlay materials Powder
  • a protective layer 62 having grooves 63 formed to cover the surface was formed.
  • the Ni-based material is an alloy having the composition described in claim 1 of Patent No. 6745735.
  • the alloy composition of SFNi4 is specified in JIS H8303:2010.
  • DHECR-TB2 is an alloy having the composition described in claim 1 of Patent No. 7044328.
  • the Ni-based developed materials, SFNi4 and DHECR-TB2 are materials that satisfy the above-mentioned first alloy composition.
  • the corrosion and wear resistance of the protective layer 62 made of various materials was measured using the following method. That is, a grate made of five types of castings with each of the five types of materials mentioned above deposited by laser as a protective layer 62 on the exposed surface inside the furnace, and a grate made of a new existing material (SCH2) (a grate without a protective layer).
  • the incinerator was operated with two of each grate placed irregularly in the combustion zone where damage to the grate was particularly severe in an actual incinerator. The trial period was half a year. After the test was completed, the amount of weight change (i.e., the amount of thinning) before and after the test was measured for each grate.
  • FIG. 6 is a graph showing the measurement results of the amount of thinning of each type of grate (the average value of the amount of thinning of each of two grates for each type of grate).
  • the amount of thickness loss for the grate without a protective layer (conventional product) is approximately 1.4 kg, while the amount of thickness loss for the grate with the protective layer 62 is 0 for any material. It was confirmed that the amount of thinning can be significantly suppressed by providing the protective layer 62 on the exposed surface of the grate in the furnace.
  • the inventors of the present invention operated the incinerator with the grate made of plate material on which DHECR-TB2 was laser-plated placed in the combustion zone where the grate was particularly damaged. I let it happen. The trial period was half a year. After the test, we measured the amount of weight change (i.e., the amount of thinning) for each grate before and after the test, and found that the amount of thinning was the same as above, and the thinning was suppressed regardless of the material of the base material. This was confirmed.
  • the amount of weight change i.e., the amount of thinning

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Abstract

Cet élément foyer est pourvu d'une surface exposée dans l'incinérateur qui est exposée à l'intérieur d'un incinérateur. La surface exposée dans l'incinérateur comprend une surface avant et une surface supérieure, et au moins la surface avant est pourvue d'une couche de protection comportant des rainures formées sur sa surface.
PCT/JP2023/029843 2022-08-26 2023-08-18 Élément foyer, procédé de production d'élément foyer Ceased WO2024043187A1 (fr)

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CN202380061648.7A CN119790267A (zh) 2022-08-26 2023-08-18 炉床构成部件、炉床构成部件的制造方法

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54103079U (fr) * 1977-12-29 1979-07-20
JPS608615A (ja) * 1983-06-28 1985-01-17 Hitachi Zosen Corp 都市ゴミ焼却炉用火格子
JP2004116884A (ja) * 2002-09-26 2004-04-15 Ebara Corp ストー力式焼却炉用燃焼装置
JP3180720U (ja) * 2012-10-22 2013-01-10 日立造船株式会社 火格子
JP2017003251A (ja) * 2015-06-04 2017-01-05 荏原環境プラント株式会社 火格子及び火格子の製造方法
US20190316771A1 (en) * 2016-07-11 2019-10-17 Clean Thermodynamic Energy Conversion Limited Combustion kiln system and method of operating the same
WO2020199099A1 (fr) * 2019-04-01 2020-10-08 深圳市能源环保有限公司 Segment de grille anti-feu basculante d'incinérateur d'ordures intégré doté d'une couche de soudure de cordon

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54103079U (fr) * 1977-12-29 1979-07-20
JPS608615A (ja) * 1983-06-28 1985-01-17 Hitachi Zosen Corp 都市ゴミ焼却炉用火格子
JP2004116884A (ja) * 2002-09-26 2004-04-15 Ebara Corp ストー力式焼却炉用燃焼装置
JP3180720U (ja) * 2012-10-22 2013-01-10 日立造船株式会社 火格子
JP2017003251A (ja) * 2015-06-04 2017-01-05 荏原環境プラント株式会社 火格子及び火格子の製造方法
US20190316771A1 (en) * 2016-07-11 2019-10-17 Clean Thermodynamic Energy Conversion Limited Combustion kiln system and method of operating the same
WO2020199099A1 (fr) * 2019-04-01 2020-10-08 深圳市能源环保有限公司 Segment de grille anti-feu basculante d'incinérateur d'ordures intégré doté d'une couche de soudure de cordon

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
XU GUOJIAN, KUTSUNA MUNAHARU, HANEDA MITSUAKI, KOIDE HIROO: "Plasma Cladding and High-Efficient CO 2 Laser Cladding of Nickel Based Alloy Powder on the Machinery Parts", PREPRINTS OF THE NATIONAL MEETING OF JAPAN WELDING SOCIETY. SESSION ID : 214, 1 April 2005 (2005-04-01), XP093142217, DOI: 10.14920/jwstaikai.2005s.0.27.0 *

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