Although the structure of the hazardous waste treatment rotary kiln is similar to that of the cement rotary kiln, they are both called rotary kilns, but when masonry, because the hazardous waste treatment rotary kiln is relatively small, the method is different from the cement rotary kiln, and it mainly adopts the ejector rod method of refractory brick wet masonry. In the process of masonry, the following 10 aspects need to be paid attention to:
1) Using wet masonry, the brick joint gap between the refractory bricks is required to be no more than 2mm, and the gap between each ring is 15 2mm, the longitudinal clearance of the same ring is 1 15mm;All brick joints should be soaked in mud, the surface of the joints, the purpose is to compact the mud, to prevent the appearance of gaps, only allowed to use a wooden hammer or rubber hammer for alignment, after the mud is dry, shall not be beaten again, to prevent the refractory bricks from being shaken loose;The extruded refractory mud should be cleaned in time to keep the surface of the refractory bricks clean.
2) Every interval of 1m (about 4 rings), add a layer of 3mm cardboard or ceramic rock wool or other specified filling materials as expansion joints;The specific position of the expansion joint should be in accordance with the design regulations, and the stressed part should be avoided in general.
3) When masonry, it is necessary to ensure that the refractory bricks are close to the inner wall of the kiln, and the sides of the refractory bricks (circumferential) are close to each other, and the rubber hammer or wooden hammer is used to strike at any time to ensure that these two items are tightly attachedFrom time to time, check whether each ring joint is parallel to the ring reference line, whether the radial direction line of the refractory bricks is concentric with the kiln body, there can be no "step" phenomenon between the ring refractory bricks, and the brick joints can not appear wedge-shaped brick joints.
4) When masonry at the weld, you can cut off the brick corners or use refractory mud (fire clay) leveling to ensure that the refractory bricks are close to the inner wall of the kiln, when masonry is built at the deformation of the kiln body, because the refractory bricks can not be attached to the kiln body, the masonry is carried out after leveling with refractory mud, and the side of the refractory bricks with axial skew can not be tightened, and the refractory mud is used to increase the ceramic fiberboard.
5) when using the top bar method masonry, should be from the bottom at the same time to both sides (circumferential direction) balanced masonry, more than half a circumference of 1 2 layers of bricks, with wood square and spiral ejector rod compaction, with appropriate force to tighten the ejector rod, to prevent excessive force caused by the deformation of the kiln body, each section of the bottom length, and then from the bottom to the horizontal masonry, compaction, it should be noted that when locking bricks, need to leave 4 6 layers of bricks, and rotate the lock area to the o'clock direction, convenient for locking bricks;
6) each ring lock area masonry needs to pay attention, to carry out the pre-combination of bricks, to ensure that the rear brick can be reasonably driven, the lock area using special lock bricks, when it is really necessary to process bricks, its thickness can not be less than 2 3 of the original brick thickness, and can not be driven into the masonry;
7) When using lock bricks and steel plate lock mouths, it is necessary to pay attention to the brick joints after arranging the lock bricks and standard bricks, pay attention to observe the brick joints, if the brick joints are horizontal, then the steel plate is driven into the side of the standard bricks, and the steel plate shall not be driven into the side of the lock bricks, if the brick joints are wedge-shaped, the refractory bricks will be damaged by stress concentration and need to be reworked.
8) Both sides of the same brick can not be driven into the steel plate, each brick joint can only be driven into a steel plate, the thickness of the lock joint steel plate is generally not more than 3mm;When there are 2 or more ring lock bricks, the lock bricks should not be used next to each other, and the lock bricks between different rings should be staggered with each other.
9) In the process of masonry, it is necessary to use amorphous refractory materials, and it should be noted that the mixing time and mixing method of the material are different due to the grade and quantity of the material, and the mixing time and mixing method and temperature should be strictly in accordance with the instructions for stirringThe mixing water is pure water, and the hydrogen ion content is required to be 300g l. The use of refractory mud should pay attention to the system with the masonry, the amount of each stirring should not be too much, and the initial setting shall not be used in the use of refractory castables need to vibrate and compact, and when using the vibrating rod, pay attention not to act directly on the anchors and use a suitable vibrator for vibration compaction.
10) After the masonry is completed, the refractory bricks of each ring need to be inspected and fastened;After the tightening is completed, the oven work should be carried out, and it is not appropriate to rotate the kiln body at this time.