The cylindrical chrome corundum brick is a chrome corundum body pressed as a hollow cylinder instead of a rectangular block, and it is made specifically for regenerator checkerwork. The round section gives the regenerator stack a higher heat-exchange surface and a more open gas path, while the...
The cylindrical chrome corundum brick is a chrome corundum body pressed as a hollow cylinder instead of a rectangular block, and it is made specifically for regenerator checkerwork. The round section gives the regenerator stack a higher heat-exchange surface and a more open gas path, while the chrome corundum chemistry resists the alkali and sulphate attack that destroys softer checker materials in the condensation zone.
XZK produces cylindrical chrome corundum bricks in the same Cr2O3 ladder as our flat chrome corundum range — XZK-CC10, CC12, CC15 and CC30 — with the geometry adapted to the regenerator chamber and its zoning.
A cylindrical checker brick changes the way gas moves through the regenerator. Gases pass around and through the cylinders instead of rising through straight vertical flues, so flow is distributed across the whole cross-section rather than channelling through the largest openings in the stack. The result is a more uniform temperature profile and steadier heat recovery, and an open structure that is slower to block when sulphate condensate or batch dust begins to accumulate between the bricks.
Because the wall section of a cylinder is thinner than the equivalent solid rectangular block, the shape is also more tolerant of thermal shock — which it needs to be, since the regenerator alternates between flue gas and combustion air every 20 to 30 minutes for the life of the campaign. The chrome corundum body supplies the chemical resistance. Chromia in solid solution in the corundum lattice holds the refractoriness under load above 1700°C, keeps cold crushing strength at 100 MPa or more, and resists the wetting and dissolution that sulphate condensates cause at the brick surface. Apparent porosity is held to 17% or below so that condensate cannot penetrate deep into the body.
Regenerator duty is zoned, and the cylindrical brick is placed to match. Above about 1100°C the checker faces thermal shock plus high-velocity alkali and batch dust. Between 800 and 1100°C, alkali vapour reacts with sulphur oxides to form sulphates that condense, expand and block the flues. Below 800°C the packing simply carries the accumulated dead weight of everything above it under continuous thermal cycling. Chromia content is raised as the condensation chemistry becomes more aggressive, and the cylindrical section keeps the whole bed open against the blockage that is the usual reason a regenerator loses performance before it loses structure.
| Technical Properties | XZK-CC10 | XZK-CC12 | XZK-CC15 | XZK-CC30 |
| Al₂O₃ (%) | ≥ 83.0 | ≥ 80.0 | ≥ 78.0 | ≥ 62.0 |
| Cr₂O₃ (%) | ≥ 10.0 | ≥ 12.0 | ≥ 14.5 | ≥ 30.0 |
| Fe₂O₃ (%) | ≤ 0.3 | ≤ 0.3 | ≤ 0.3 | ≤ 0.3 |
| Bulk Density (g/cm³) | ≥ 3.25 | ≥ 3.25 | ≥ 3.25 | ≥ 3.40 |
| Apparent Porosity (%) | ≤ 17 | ≤ 17 | ≤ 17 | ≤ 17 |
| Cold Crushing Strength (MPa) | ≥ 100 | ≥ 100 | ≥ 100 | ≥ 100 |
| Refractoriness Under Load (0.2MPa, ℃) | ≥ 1700 | ≥ 1700 | ≥ 1700 | ≥ 1700 |
| Thermal Shock Resistance (950℃ air-cooled, cycles) | ≥ 12 | ≥ 12 | ≥ 12 | - |
Test methods follow GB/T and ISO practice; ASTM equivalents and full certificates of analysis are issued with every shipment.
Grade selection in a regenerator is a zoning exercise: the same chamber takes different chrome corundum grades at different heights, and the cylindrical shape is the constant across all of them.
XZK supplies the full set of regenerator refractories from a single production line, so the cylindrical checkerwork, the flat chrome corundum courses, the rider arch and the outer wall can be ordered as one coordinated package with matching chemistry and tolerances.
The cylindrical chrome corundum brick is a regenerator component, and its grades are positioned according to the temperature zone and the chemistry each zone imposes on the checkerwork.
Manufacturing is controlled from raw material through to finished brick. Four automatic batching lines feed 20 CNC presses ranging from 630 to 2000 tonnes, so density is set by press force rather than operator judgement, and firing runs through four 108-metre fully automatic tunnel kilns and five ultra-high-temperature shuttle kilns for a uniform soak.
Every batch is tested for bulk density, apparent porosity, cold crushing strength and refractoriness under load, and ships with a certificate of analysis. XZK Group holds ISO 9001, ISO 14001, ISO 45001 and ISO 50001 certification and operates the Henan Provincial Engineering Technology Research Center for Sintered Refractories for Glass Furnaces.
Cylindrical chrome corundum bricks are the core of a complete regenerator package, supplied with flat chrome corundum bricks, sillimanite bricks and andalusite bricks for rider arches, magnesia bricks for the hottest top courses, high alumina bricks for outer courses and low porosity fire clay bricks for the outer wall. See the regenerator refractory range or browse all refractory products.
Al₂O₃:≥80%;
Bulk Density:≥2.75g/cm³;
Cold Crushing Strength:≥85MPa;
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