Refractory system for lining the interior walls of high-temperature furnaces or boilers and method of protection

{
  "publication_number": "US10495304B2",
  "country": "US",
  "kind": "B2",
  "title": "Refractory system for lining the interior walls of high-temperature furnaces or boilers and method of protection",
  "abstract": "Refractory tile systems for covering an internal wall of a high temperature furnace or boiler are described. The systems may comprise a base tile having a front face and a back face, and a shielding tile having a front face and a back face. The back face of the base tile may comprise one or more attachment points for mounting the base tile to the internal wall using an anchoring system, wherein the shielding tile is equipped with a protrusion along a first side, extending from the back face of the shielding tile and adapted to stably arrange the shielding tile in a suspended position from the base tile when mounted to the internal wall, and an overhang along a second side opposite the first side and extending from the front side of the shielding tile, such that in a mounted position, the overhang partially covers an adjacent shielding tile.",
  "claims": [
    "1. A refractory tile system for covering an internal wall of a high temperature furnace or boiler, comprising: a base tile having a front face and a back face, and a shielding tile having a front face and a back face, wherein the back face of the base tile comprises one or more attachment points for mounting the base tile to the internal wall using an anchoring system, wherein the shielding tile is equipped with a protrusion along a first side, extending from the back face of the shielding tile and adapted to stably arrange the shielding tile in a suspended position from the base tile when mounted to the internal wall, and an overhang along a second side opposite the first side and extending from the front face of the shielding tile, such that in a mounted position, the overhang covers a portion of an adjacent shielding tile, and wherein the base tile and the shielding tile are connected in a mounted position by a cooperating system, wherein sliding protrusions extending from the entire length of a third side and a fourth side opposite the third side of the shielding tile extend into sliding recesses present along the entire length of the corresponding third and fourth sides of the base tile.",
    "2. The refractory tile system according to claim 1, wherein the base tile and the shielding tile are substantially planar and substantially rectangular.",
    "3. The refractory tile system according to claim 1, wherein the one or more attachment points are one or more recesses.",
    "4. The refractory tile system according to claim 1, wherein the overhang covers the protrusion of a shielding tile mounted directly below.",
    "5. The refractory tile system according to claim 4, wherein the protrusion and the overhang extend along the entire length of the first and second sides, respectively, of the shielding tile.",
    "6. The refractory tile system according to claim 1, wherein the sliding recesses along the third and fourth sides in the base tile define a back portion and a front portion of the base tile, and wherein the edges of the front portion and the back portion on the third side are laterally in line and the edge of the fourth side of the front portion is laterally offset compared to the edge of the fourth side of the back portion in a direction such that the front face of the base tile is narrower than the back face of the base tile.",
    "7. The refractory tile system according to claim 3, wherein the base tile comprises an evacuation channel connecting the recess for mounting the base tile with one of the sides of the base tile, such that air trapped within the recess may escape to the outside.",
    "8. The refractory tile system according to claim 1, wherein the base tile comprises silicon carbide (SiC) or nitride-bonded silicon carbide (nSiC).",
    "9. The refractory tile system according to claim 1, wherein the shielding tile comprises non-porous silicon-infiltrated silicon carbide (SiSiC).",
    "10. The refractory tile system according to claim 8, wherein the base tile consists essentially of silicon carbide (SiC) or nitride-bonded silicon carbide (nSiC), or wherein the shielding tile consists essentially of non-porous silicon-infiltrated silicon carbide (SiSiC).",
    "11. The refractory tile system according to claim 1, wherein, in a repetitive mounted position, the third and fourth sides of the base tile and shielding tile respectively form a labyrinth to inhibit gas transfer between adjacent mounted tile systems.",
    "12. A method for protecting an interior wall of a furnace or boiler from corrosive gases, oxygen, slag, debris, or other objects, comprising mounting a refractory tile system according to claim 1 in a repetitive pattern on the interior wall of the furnace or boiler.",
    "13. The refractory tile system according to claim 9, wherein the base tile consists essentially of silicon carbide (SiC) or nitride-bonded silicon carbide (nSiC), or wherein the shielding tile consists essentially of non-porous silicon-infiltrated silicon carbide (SiSiC).",
    "14. The refractory tile system according to claim 1, wherein the portion of the adjacent shielding tile covered by the overhang is on a front face of the adjacent shielding tile.",
    "15. A refractory tile system comprising: a base tile having a front face and a back face, wherein the back face of the base tile comprises at least one recess for mounting the base tile to a wall using an anchoring system, the back face of the base tile further comprising an evacuation channel in communication with the at least one recess; and a shielding tile having a front face, a back face, a first side, and a second side opposite the first side; wherein the first side of the shielding tile includes a protrusion extending from the back face of the shielding tile, the protrusion being configured to couple to the base tile, such that the shielding tile is suspended from the base tile when the base tile is mounted to the wall; and wherein the second side of the shielding tile includes an overhang extending from the front face of the shielding tile, such that in a mounted position, the overhang covers a portion of an adjacent shielding tile, and wherein the base tile and the shielding tile are connected in a mounted position by a cooperating system, wherein sliding protrusions extending from the entire length of a third side and a fourth side opposite the third side of the shielding tile extend into sliding recesses present along the entire length of the corresponding third and fourth sides of the base tile.",
    "16. The refractory tile system according to claim 15, wherein the base tile comprises at least one of silicon carbide (SiC) or nitride-bonded silicon carbide (nSiC), and wherein the shielding tile comprises non-porous silicon-infiltrated silicon carbide (SiSiC).",
    "17. The refractory tile system according to claim 16, wherein the portion of the adjacent shielding tile covered by the overhang is on a front face of the adjacent shielding tile."
  ],
  "description_excerpt": "This application is a national stage entry under 35 U.S.C. § 371 of PCT International Application No. PCT/EP2015/072533, filed Sep. 30, 2015, and claims the benefit of priority of GB Application No, 1417495.7, filed Oct. 3, 2014, the subject matter of all of which is incorporated herein by reference.\n\nThe present invention relates to refractory systems for lining interior walls of high-temperature furnaces or boilers, such as for example in waste incinerators.\n\nIn waste incineration plants, refractory tiles are applied in order to protect the tube sheets from corrosive gases and temperature. These refractory tiles are suspended from stainless steel anchors which are welded onto the tube sheet. The refractory tiles are made of refractory material with a high content of silicon carbide (SiC). Generally the SiC-content is 85% or higher. On the one hand, SiC has a high heat transfer rate, allowing a maximum amount of energy to flow to the tube sheets. Furthermore, due to the high heat transfer, the hot side of the SiC tile remains relatively cool, such that slag remains from the incinerated waste do not stick easily to the tiles.\n\nBecause SiC is sensitive to oxidation above 900° C., the tiles may be pre-fired in the absence of oxygen and a nitride bond is created. Such tiles are therefore known as nitride-bonded silicon carbide (nSiC) tiles. However, after some time in use, generally after about 3 to 5 years, nSiC-tiles will also become sensitive to oxidation, and at a certain moment they will start to oxidise. One effect of this is a change in volume of approximately 5% on the hot side, which causes damage to the tile.",
  "cpc": [
    "F23M 5/02",
    "C04B 2235/428",
    "C04B 35/565",
    "F23M 2900/05005",
    "F23M 5/04",
    "F23M 5/08",
    "F27D 1/0006",
    "F27D 1/004"
  ],
  "ipc": [
    "C04B 35/565",
    "F23M 5/02",
    "F23M 5/08",
    "F27D 1/00"
  ],
  "assignees": [
    "Imertech SAS"
  ],
  "inventors": [
    "Marinus Rien Boer"
  ],
  "filing_date": "2015-09-30",
  "publication_date": "2019-12-03",
  "grant_date": "2019-12-03",
  "priority_date": "2014-10-03",
  "application_number": "US-201515516565-A",
  "family_id": "51946792",
  "cited_by_count": 4,
  "citations": [
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  ]
}