Fireproof material regards a of cement kiln important construction as material, its build by laying bricks or stones builds the stand or fall of quality, the service life that affects cement kiln directly. Accordingly, regard fireproof material as manufacturer, provide reasonable construction technology support, can highlight oneself actual strength not only, can add oneself product more additional cost; And as construction square, master the technology of cement kiln construction, applicable condition that knows of all kinds and fireproof stuff to also become knowledge wanting equipment.
Besides, as some closer year come of cement kiln technology tell to develop, large the application that exceeds large cement rotary kiln, also brought a lot of challenges to construction, the fireproof material build by laying bricks or stones of certain place constructs cement pit construction state of affairs is unusually intricate, how to resolve the key difficulty of these construction, the article spreads out at this point.
One, the modulation of fireproof mud
The correspondence of firebrick and fireproof mud concerns
Before build by laying bricks or stones is built, should undertake experiment and be buildinged with build by laying bricks or stones to all sorts of fireproof slop, the setting time that decides different slop, piece coagulate time, frustrated consistency and water consumption. To enraging rigid slop, the setting time of refractory products should be controlled inside limits of 1 ～ 5min.
Modulation of every kinds of fireclay should use special mud case, if need modulation when a few kinds of slop, all sorts of slop should hang out his shingle clearly bright show. Change when the slop of an agitate, slimy box should be cleaned thoroughly.
Modulation fireclay should use clean water, water quality should achieve townsman to allow with water gauge. Add the slop of additive to mix into, in water chloric ionic content should under 300ppm.
When air temperature is too low, agitate can heat with water, in order to assure the appropriate temperature of slop.
To enraging rigid fireclay, should assure what fireclay has 30min above what to mix but build by laying bricks or stones builds time. Already amiable rigid fireclay does not use the water rigid with good modulation so that random adds water again, the fireclay that has coagulated first cannot continue to use, determined and deserted. Have the slop of water glass or bittern bond or additive to mix into, meet in air as a result of its gradually caky, should follow along with tone with.
The fireclay that day should not leave buy to arrive to be used the following day normally.
2, wet build by laying bricks or stones is built
Firebrick asks build by laying bricks or stones seams full oar, the brick seams width to should accord with blueprint to design a requirement.
After every firebrick is put, want to use wooden hammer or rubber hammer to beat, so that squeeze an over fireclay, should make sure the brick is seamed stick completely with housing close, surface contact should be between firebrick and union is firm. When beating firebrick, should prevent to be beaten unsuitedly or extruding injures firebrick or injury begins caky fireclay.
Raze answers before the fireclay unfinished that seams in the brick is completely sclerotic redundant fireclay, when if have some of place,still needing fill fireclay, apply new fireclay of fact of drawknife a place of strategic importance,
Ash is seamed want horizontal smooth upend, dambered surface is calm, contact is close, should make sure body of build by laying bricks or stones and each equipment place are denotive measure is consistent.
Straight wall uses a fault to seam build by laying bricks or stones to build, vault and kiln should be used in circumferential clitellum direction direct seam build by laying bricks or stones to build. Build by laying bricks or stones builds comfortable stress to beg a brick to seam flat dambered surface smooth. ensure quality.
Hold bricky board and flange in the palm dish wait for metallic parts of an apparatus to cannot be contacted directly with firebrick, should besmear in parts of an apparatus fill fireclay, hold in the palm should stay below bricky board make an appointment with 10mm to expand seam. Expand fireproof fiber felt can fill in in seaming, hold bricky board in the palm in order to protect. Flange and metallic parts of an apparatus can use fireclay to execute close, avoid metallic parts of an apparatus and contact of high temperature gas.
In the course that produces to investment from construction, should prevent system of build by laying bricks or stones be affected with damp be affected with damp and suffer aspic, also should prevent to appear prematurely exorbitant temperature, the intensity that makes fireproof mud short of due.
3, build by laying bricks or stones of anchorage solid brick is built
Anchorage solid brick can raise the integral sex of straight side wall. Of the metallic housing in equipment in expand and contracting, aperture can appear between metallic housing and fireproof material, farinaceous stock passes firebrick aperture likely gradually fill among them, bring about straight side wall to be in eventually perpendicular the cave in below the action of the force at metope, equipment heats in the process, firebrick expands likely also as a result of inside and outside not divide evenly and cave in. The use of anchorage solid brick can reduce the probability that two kinds of adverse change occur greatly.
Of anchorage solid brick decorate and build by laying bricks or stones builds should follow the following principle:
The platoon cloth of anchorage solid brick should be mixed according to the span of temperature the bulk of frequency and area of straight side wall will decide, should not be less than 6 normally / M2.
Brick of solid of anchor of the microscope before build by laying bricks or stones is built, anchorage solid brick originallies in anchor if aperture place is influential cannot use when the crackle to intensity of whole of anchorage solid brick, answer to discard stoutly.
Build in build by laying bricks or stones when be close to position of anchorage solid brick, should not tire of the its irritated exact position that discharges a brick to decide anchorage solid brick beforehand, it is to use what steel wire brushs housing of thoroughly clean metal to solder place, use the welding rod that suits at weldment photograph, solder firmly canal of very anchorage solid.
Build by laying bricks or stones of anchorage solid brick is built anchorage solid hook is inserted after ending, fill in with air attack of cram of fireproof fiber felt close, with forming certain protection to anchorage firmware.
The thickness that anchorage solid provides has particular demand. When tube wall is too thin, will as a result of inevitable slow burn caustic and bring about inchoate damage. The heat-resisting rolled steel that anchorage solid hooks is qualitative should the factory temperature according to be in the position and calm. The refractory steel that the anchorage firm that cement industry uses normally hooks has Cr18Ni9Ti, Cr25Ni18, Cr25Ni20 to wait.
4, the lock brick inside arch circle
Locking up a brick is to show build by laying bricks or stones of the arch since support builds circle, semicircle or inadequacy when semicircular arch is encircled, build by laying bricks or stones builds after, this arch is eliminated after in order to between the brick inside the circle and brick the brick of clearance. The requirement is as follows:
Build by laying bricks or stones builds vault and round wall, arrive when circuit build by laying bricks or stones return remnant 5 ～ when 6 bricks, should doing of its irritated go ahead of the rest piles up not tire of firebrick, strive for the combination that passes different specifications brick to satisfy the requirement with strict wedge. If cannot achieve a requirement, need to measure the size that machines a brick subtly, do a yard again with the firebrick that machines by dimension, build by laying bricks or stones builds hind the space is the space that 3 former brick place that did not implement cut on ply occupy fitly.
The bricky face that machines a brick does not get front housing, prevent occurrence firebrick and housing between cannot stick effectively close.
The position with lock located brick should be in be apart from treatment brick 2 ～ are in 3 pieces, and lock brick cannot be executed in the coping of arch work. Should in vault the equidistance position of two side fulfils the school assignment that lock up a brick.
The lock brick that uses eventually is to be in the space of two former bricks that did not implement cut on ply, use the former brick that did not undertake machining to fulfil the school assignment that lock up a brick, in order to assure lock brick intensity, reduce the attrition when the wedge that lock up a brick.
5, of arch circle firebrick choose and machine
Arch circle is the gravity in firebrick oneself and action below the balance action of the horizontal thrust on arch foot brick, achieve the stability that arch encircles. For this, arch circle firebrick should bear the extruding that arch encircles, due and particular strength. Brick due and certain wedge is spent, arch encircles bricky face to answer relatively level off, make surface contact maintains between firebrick thereby. Below the condition that can change in temperature so, better, long maintenance the stability that arch encircles. Arch encircles the treatment of firebrick to should follow the following demand:
Firebrick can use hacksaw except the adiabatic brick with inferior intensity outside treatment, other firebrick uses treatment of the machine that cut a brick. Forbidden cut authentic treatment with hand hammer and flat shovel.
Be not answered to be less than the 1/2 of former brick dimension by the length direction of treatment brick, 70% what its ply should not be less than former brick, have enough strength in order to maintain firebrick. If appear,above is less than to set after the brick is machined together, should machine two bricks.
Forbidden in brick of the authentic on body of build by laying bricks or stones, forbidden undertake in body of build by laying bricks or stones knock works, the direct damage that causes firebrick thereby or go sexual attaint.
6, dry method build by laying bricks or stones is built
The cup one hand in the other before the chest that builds with dry method build by laying bricks or stones encircles firebrick, its requirement and wet build by laying bricks or stones is built similar, answer to be tightened with the armor plate wedge after 2mm after. Armor plate should level off, without concave and convex, without burr, without rustily, head application emery wheel is ground piece be less than the wedge horn of 60, so that wedge. A brick is seamed can wedge an armor plate, prohibit a brick seams wedge two armor plate. Armor plate do not answer the brick of whipstitch brick seams wedge, should separate 1 ～ 2 bricks are seamed.
7, expand seam stay set
Because the fireproof material of industrial kiln furnace is chemical of composition and physical structure different, and what build by laying bricks or stones builds method and build by laying bricks or stones to build material is different, after be heated expand the quantity also has certain difference. Accumulate fireproof material roughly to expand seamed setting, answer to decide according to above element. Expand normally seamed span should be between 1.5 ～ 2m. Working temperature the Ⅲ under 800 ℃ kind saggar brick build by laying bricks or stones builds build by laying bricks or stones of body, red brick to build body and diatomite brick build by laying bricks or stones to build system, because expand the volume is minor, oneself absorbs ability stronger, in the length less than of 4m, can not set expand seam. Usually, expand seamed width should be taken heat the 50% ～ that the quantity expands theoretically when face high temperature is spent 100% . Be liner of commonly used and fireproof material below expand the referenced value that seams width (Mm/m) .
1, body of build by laying bricks or stones expands seam width
2, expand seamed position
Expand seamed position should keep away from place getting power, be like the hole of framework of body of heater and liner, affect the integral intensity of fireproof material in order to avoid, expanding seam the premise that maintains reasonable span to issue even setting. Body of firebrick build by laying bricks or stones is in intersect of place expand if plan institute shows,seam a setting:
Of hearth expand seam all answer in a hearth is the same as in fluctuation brick layer crisscross setting.
Of boiler setting expand outside be being seamed inside mix between the layer between fluctuation layer, all answer crisscross setting.
Circular arch wall can stay between body of build by laying bricks or stones and crust set expand seam set in order to fill expand, fill among them with adventitious fireproof material or heat-insulating material. Can expand subsequently to crust, hot to coming loose demand is not high, do not fill fireproof material or heat-insulating material Yi Ke.
Vault expands directly in two upright put apart commonly seam, leave what each way should consider when setting to expand, vault height is more than 2.5m, except stay in two end set expand outside seaming, still answer to grow section according to arch, in vault mid stay set expand seam. The vault that crisscross build by laying bricks or stones builds can stay set expand directly seam, also can leave stagger to expand seam. The vault that direct build by laying bricks or stones builds, should choose stagger to expand seam. Multilayer vault expands seam should crisscross setting. Expand seam on due have certain stiffness enclothe, form add bind round together. Measure to expanding bigger like silica brick, magnesia brick, besides above expand outside seaming, still should be in 3 ～ increase a place of strategic importance between 5 bricks the chipboard with 1 ～ thick 2mm, expand in order to strengthen the compensation of the quantity.
To overhead suspension roof, besides the edge the setting expands all round roof outside seaming, still should consider bottom boiler setting to expand up be answered the clearance of put apart. In wall and top hand in collect place, should install what absorb perpendicular direction to absorb horizontal way again already to expand seam.
Bigger to the diameter furnace top, in carry out fireproof irrigate build of makings irrigate when building, should install control to expand appropriately seam, break up roof the sector that is not more than 2m into diagonal length or arched village, partition is irrigated build.
To a few significant position, affect integral intensity to avoid its craze, the position with can be in not quite significant all round its installs control to seam, absorb the stress that change of significant position bulk produces, avoid significant position craze, with beforehand the generation of the crackle that the break of buy prevents specific place, such beforehand the break of buy also says its are seamed for control normally.
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