Furnace of kiln of TOP fireproof material applies technical channel begin lecturing, what share to everybody today is reach the knowledge that how prolongs life about reason of general situation of aerification furnace liner, attaint.
1, aerification furnace uses the development general situation of expensive chromic fireproof stuff to be in, what with Gao Ge to furnace of aerification of water coal oar fireproof material undertakes study basically is the United States, Germany, France wait, and main from research coal slaggy character begins, the tall 50~100 of grey melting point that compares coal normally because of the operation temperature of furnace of aerification of water coal oar ℃ , major slag is liquid state in aerification furnace moving process. The alkalinity with slaggy coal is 0.4~1.0 commonly. Lim discovery, slaggy to the coal of this alkalinity limits, the solubility of different oxide amid sees a picture 1, it is with the deliquescent quantity of Cr2O3 least, make clear Cr2O3 material exceedingly good to coal fights aggressivity slaggily to be able to be compared. Reported coal ash broken bits is right in document of the fireproof material of different Cr2O3 content erode rate (2) seeing a picture. As the addition of content of the Cr2O3 in fireproof material, coal ash broken bits is right of fireproof material erode rate to be reduced gradually. Ceng Cai is made for raw material with chromite and agglomeration magnesia take contain Cr2O3 fireproof material, but the experiment that fight broken bits makes clear, of this material fight aggressivity of coal ash broken bits poorer, this basically is the bulk because of the Fe2O3 that contains among them expands effect causes fireproof material to appear serious craze.
20 centuries 80 time are prime, austrian Radex company develops brick of spar of a kind of magnesian chromic needle above all. Differ with groovy magnesian chromic brick, this brick is used high pure Cr2O3 and high pure magnesia replaces chromic mine and agglomeration magnesia. Because was used high pure raw material, the moderate of intensity of normal temperature compression of this brick, high temperature capability is admirable, especially creep of high temperature pressing leads very low; to make clear in the try out on Texaco technology demonstrative unit, rate of caustic of this brick corrode is inferior, but because of,appear easily excessive expand and the phenomenon of craze.
After material of pointed spar of afterwards magnesian chromium, french SAVOIE company developed Cr2O3-Al2O3-ZiO2-SiO2 and Cr2O3-Al2O3- in succession ZiO2 fastens material. Cr2O3-Al2Os-ZrO2-SiO2 material comparatives because of containing quantitative SiO2, changed the aggressivity fighting broken bits of this material infirmly greatly. 20 centuries 80 time later period, begin comprehensive promotion to apply Cr2O3-AI2O3- ZrO2 material, mark of its Cr2O3 quality by 80% raise 85% ~ 90% , basically have CRB-86 and CRB-90 two brands.
Be in our country, as technology of aerification of pressurization of water coal oar a large number of introducing, fireproof material earnestly needs costly entrance tall chromium homebred change. Accordingly, our country is in 20 centuries began to increase aerification furnace to use Cr2O3-Al2O3 at the beginning of 90 time - the strength of research and development of ZrO2 material, and at 20 centuries 90 time evening scores a success, those who realized aerification furnace to use tall chromic fireproof data is completely homebred change. Current, the service life of homebred expensive chromic fireproof stuff amounts to 18000 H Even 20000 H above, the rate that invade caustic (0.004 Mm •h-1) is the 1/7 that imports expensive chromic fireproof stuff only, and the price has 1/2 of entrance product only.
2, the use environment that aerification furnace damages with firebrick case study is aimed at aerification furnace firebrick reachs use situation, to its caustic corrode case study is as follows:
The Si that 1) contains in slaggy eater, Al, Ca, Fe and salt of other minim metal kind the part that made eater, different coal is planted what can form different sort is slaggy, slaggy the osmosis that passes pair of bricks, fuse forms compound of low melting point with the composition of firebrick, changed bricky composition, compound of low melting point is eroded ceaselessly, bring about firebrick ceaseless by fuse, permeate, be denuded gradually thereby, enter by air current carry secretly stimulate cold room, form grey broken bits. The destruction of 2) thermal stress is existing as a result of the norms of firebrick and dimension the inhibition of temperature gradient and furnace casing, make firebrick produces annulus to stress, additional, the different composition of firebrick its coefficient of expansion is different, also can produce different thermal stress in bricky interior, leave often jockey bring about furnace temperature fluctuate considerably, also can make the thermal stress of firebrick produces the sudden appearance that change and causes a brick to produce crackle, make firebrick ceaseless by caustic corrode. If leave often,the influence operation operating mode of 3) operation operating mode is not stabilized jockey, temperature pressure wave motion and error of a few operations also are met the caustic corrode of aggravate firebrick, lift as what operate temperature, the caustic corrode rate of firebrick will increase. What the influence of 4) other element plants as a result of coal is not stable, the part that causes broken bits sends those who give birth to metabolic; burner to assemble dimension unqualified, cause effect of coal oar pulverization bad; burner is using later period, brick of furnace of coil leak; builds mass of build by laying bricks or stones poorer the use state that waits for other element to also change firebrick.
3, how to lengthen aerification furnace the service life of fireproof material? The life that aerification furnace uses fireproof data is main with its the care and maintenance on structure of system of quality, build by laying bricks or stones and construction quality and operation is concerned. Want to lengthen fireproof material service life to want to close good firebrick quality above all. Aerification furnace has diverse use demand each layers with fireproof material, each firebrick should satisfy these requirements below the principle with sound economy. The brick in whole furnace more, dimension of each place firebrick should accord with a design to ask, the surface wants level, reduce the spot to process a volume as far as possible. Structure of system of build by laying bricks or stones wants reasonable, construction wants excellent. It is good that requirement brick seams small stability, bearing structure and expand seam stay appropriately, can undergo the abrupt change of temperature, pressure. Should accomplish on operation management 1, nozzle is applicable. Pulverization horn wants appropriate, lest blaze erodes body of fireproof build by laying bricks or stones and cause damage. 2, warm up strict. The furnace that new step builds wants strict according to warm up curvilinear requirement, control ground warms up stage by stage roast, lest because body of build by laying bricks or stones is acuteness dehydration is acuteness bilge to shrink and damage. 3, decrease to stop. Avoid as far as possible or decrease to leave needlessly stay a time, realize around working procedure balanced production, in order to reduce the firebrick damage that urgent cold urgent heat and pressure change cause. 4, adjust smooth. Of furnace temperature furnace pressure litre fall do one's best is smooth, forbidden overheating exceeds pressure, avoid by all means rises pelt urgently. The temperature change because of each brick always is lag at temperature of the chamber of a stove or furnace, lean more outer temperature change is slower, if temperature of the chamber of a stove or furnace inside short time is acuteness,change, between bricky layer because difference in temperature is too big,can produce immense internal stress and cause firebrick and brick to seam burst. The jump light of pressure can make firebrick has not enough time to balance because of pressure of the gas between each brick, pressure difference increases and be destroyed. Furnace temperature furnace pressure fluctuates badly a collapse that causes system of whole and fireproof build by laying bricks or stones at the likelihood. 5, prevent water to stimulate. The firebrick of red heat suffers water-cooling suddenly to stimulate meeting blowout, should take strict precautions against consequently take water to enter furnace. The account that aerification furnace takes water is roughly: Boiler deputy produce vapour to take water, heavy oil to take water and nozzle refrigeration chuck is slack, urgent cold room or hydrosphere segregator water level are exorbitant, enter furnace when jockeying suddenly inside, aerification furnace exit provides the technological process that uses water-cooling bushing, if exit canal is burned crack, jockey the cooling water when discharge is pressed enters furnace inside.
The place on put together appeals to, TOP is above technology of application of furnace of fireproof material kiln is little make up those who arrange reach about reason of general situation of aerification furnace liner, attaint how to prolong life relevant content, greeting attention is able to bear or endure channel of material manufacturer technology.
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