01 The masonry of lime kiln lining should be based on the center line of kiln shell. When the verticality tolerance and diameter deviation of the center line of kiln shell meet the requirements of kiln lining inner shape, the kiln shell can be used as the guide surface for masonry, and the thickness of masonry should be checked with a template in time.
02 The mortar in all brick joints of kiln lining masonry should be full and dense, with uniform thickness, and there should be no brick joints with missing mortar. Inspection should be carried out at any time during the masonry process.
03 The thickness of brick joints of kiln lining masonry should be checked with a feeler gauge at 10 places on the surface of every 5m2 of each part of masonry. The number of brick joints with a thickness greater than 50% of the specified brick joint thickness should not exceed 4.
04 When the kiln lining is built, the actual deviation between the height of the masonry layer and the control elevation should be checked frequently so that it can be adjusted in time to eliminate the accumulated masonry errors.
05 The brick joints of the kiln lining after masonry should be horizontal and vertical, uniform and beautiful. The brick joints of adjacent brick layers or the joints of adjacent prefabricated blocks should be staggered and no overlapping joints are allowed. The staggered distance of brick joints should be greater than 12mm; the staggered distance of prefabricated blocks should not be less than 30% of their length. The joints of adjacent ceramic fiberboards should be staggered, and the staggered spacing should not be less than 100mm.
06 The brick joints on the heating surface of the kiln lining must be tightly grouted. The grouting should be carried out when the mud is semi-dry after masonry, and the joints of the heating surface of the prefabricated blocks should not be grouted when the mud is too hard.
07 When laying refractory bricks, wooden hammers or rubber hammers should be used for alignment, and iron hammers should not be used. After the mud in the kiln lining dries up, it is strictly forbidden to correct its quality defects by knocking.
08 When refractory bricks need to be processed during the masonry process, the following requirements shall be met:
① Bricks shall not be directly cut on the masonry;
② The processed surface of the brick shall not be used for the heating surface;
③ The width (thickness) of the processed brick shall not be less than 1/2 (2/3) of the original brick width (thickness). Bricks with cracks shall not be used.
09 Expansion joints shall be left around the thermocouple sleeves installed in the kiln lining, and the joints shall be evenly and densely filled with refractory fiber ceramic fiber blankets.
10 After the kiln lining is completed, the masonry is strictly prohibited from local sinking and cracking of brick joints. The inner wall of the kiln lining after masonry must be flat and smooth, and there should be no reverse misalignment along the direction of material feeding. Individual bricks may be allowed to have a forward misalignment of no more than 2mm.
11 The inner surface of the kiln lining should be flat, and when checked with a 2m long ruler, the allowable deviation of its straightness is ±5mm. When checked with an arc template with a length of 1m in the circumferential direction, the gap should not exceed 2mm.
12 The verticality tolerance of the inner surface of the kiln lining should not exceed 3mm per meter in height, and the verticality tolerance of the full height should not exceed 15mm.
13 The inner wall of the kiln lining should be concentric from top to bottom, and its coaxiality tolerance should not exceed 15mm.
14 After the kiln lining is built, the inner radius on any cross section is measured in the horizontal direction, and its radius tolerance should not exceed ±12mm.
During the construction process, the construction quality should be checked frequently to find problems and solve them at the first time.
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