Notes About Fire Bricks Laying During Furnace Construction

1. Construct the furnace either by one kind of brick or by two kinds of brick, the required matching percentage of brick in theory may differ from the actual percentage affected by distortion of cylinder. So there is no need to use bricks totally as the theoretical required amount while constructing the furnace. It’s a key point to lay the big side of brick close to the cylinder when doing the construction, and the bricks should be laid straightly and there had better no gaps between each two bricks. Fill the gaps and distortion with mortar, the repair seam line should not be too hard in case of breaking of bricks.

2. Abandon the twisted bricks which are out of distortion standard, making sure that the bricks are tightly bonded and no looseness. While construct the furnace by bricklaying machine, the upper brick especially alkaline brick can not be given too much pressure, because alkaline brick’s strength at normal temperature is relatively lower. Avoid bricks broken by uneven compression, so that to avoid kiln body falling off while working.

3. While laying alkaline bricks, watering or grouting the brick upper surface is prohibited. The well up cement mortar should be cleaned before it hardens.

4. Construct the furnace strictly according to each brick matching method to avoid distortion of brick block and kiln body working out of balance, furthermore to avoid affecting working cycle.

5. During the construction, check carefully and immediately both annular flatness and axial flatness according to the datum line in every circle and section. Parallel vertical seam line with furnace axis, parallel annular seam lines with each other, and make the parallel annular seam line vertical with the furnace axis. If the furnace body distorts or the bricks are irregular, adjust the body by steel plate and the bricks by cement mortar. The steel plates should just fit with the bricks (the length and height of steel plate should be 5mm smaller than those of brick).

6. When finish semicircle construction of the furnace, firstly check the deviation of vertical seam line with datum line and annular seam line with datum line, then lay one tier or two tiers of bricks, set up the mandrel and turn the furnace by 90⁰. Construct the left half furnace on the other side, set up another mandrel while finishing one section. Turn the furnace after the mortar hardens.