The heat of the object bilges cold shrinking is natural phenomenon, light qualitative silica brick is to be used at furnace of kiln of heating furnace roof, hot-blast stove, glass to wait for roof of industrial kiln furnace or kiln furnace, silicon pledges coefficient of expansion is adiabatic brick ≤ 1.3% .
What is coefficient of expansion? What coefficient of expansion points to is heat expands, it is the circumstance with the constant intensity of pressure outside pointing to falls normally, most material is when temperature is elevatory, its bulk increases, the bulk when thermal drop is small is contractible. Heat expands to be concerned with the physical function such as temperature, thermal capacitance, binding energy and melting point. Influence material expands the main factor of function is change, the influence of material composition and organization, each opposite sex.
Pledge mineral constituent is silica brick gently: The scale quartz of 78%~86% , the Fang Shiying of 13%~15% , still have the quartz of 4%~7% . Unit weight 0.9~1.19g/cm3, compressive strength 2.0~5.9MPa, 0.35~0.42w(mk) of coefficient of thermal conductivity. Normally 35-45% anthracitic or the slop that 30% right-and-left coke add manufacturing light silica brick is medium as combustible additive, its bead diameter is less than 1 millimeter. Choose and join of the binder in slop and mineralizer the amount is basic and as same as production silica brick. Content of 2 oxidation silicon is more than 91% , bulk density is less than the light simple fireproof stuff of 1.2g/cm3. With fine 2 oxidation silicon is raw material, its are critical bead diameter is not more than 1 millimeter normally, the grain that is less than 0.5 millimeter is less than 90% . Combustible material or the method that use aeriform happening are joined to form poriferous structure in burden, fire gets a product. OK also make it not the product of fire.
Coking plant furnace is a kind of structure complex, the hot project device that uses for a long time continuously. This method is in 950-1050 ℃ , keep apart air, undertake dry distillation, get coke etc by-product. Silica brick is good because of its thermal conductivity, laden bate temperature change of bulk of good, high temperature stabilizes intensity of machinery of tall, high temperature, fireproof sex is low, leftover expand small, fight acid slag to erode ability strong and those who become complete Jiao Lu is main and fireproof material.
Light qualitative silica brick is a kind of very special material, there is applied latent capacity in two industry domain only. Light qualitative silica brick and compact silica brick use the small qualitative part that makes structural layer normally. Of vitreous kiln be being changed gently character is commonly used, basically be the heat insolation of kiln vault, in order to reduce loss of quantity of heat, improve the efficiency of fused process. The 2nd domain is used at steel-making industry. In this domain, light qualitative silica brick is used at wall of hot-blast stove furnace and dome to be changed very gently character.
The heat preservation of vault of furnace of kiln of 1. glass industry. Fuse in glass in the process, vaulted bottom reachs high temperature. According to vitreous breed, temperature is controlled in 1600 ℃ . Small amount layer connects standing plan to be layer or two more layer. Light qualitative silica brick basically is exposed fall in these temperature load. Predicting vault monolayer (structure and light qualitative layer) will have identical or expand like the photograph function. Unit weight is 1250kg · M-3 or the silica brick of 1000kg · M-3 can satisfy close layer requirement. Lay a silica brick that uses unit weight 800kgm-3 or 600kgm-3. Light qualitative silica brick can pile up freely go up in furnace arch, also can use felt of silicon qualitative fireclay. During furnace is used (a few years) without chemical bear. Light qualitative silica brick basically is used at chemistry and the line is medium compact silica brick inside mineral composition. 2. Hot-blast stove. Hot-blast stove is used at sirocco normally (call) of blast furnace blast, be linked together with blast furnace pump. According to the appearance of hot-blast stove and position, temperature limits is 1000 ℃ - 1300 ℃ , sirocco limits is 2300-6500m3 · Min-1. Have want computational hot-blast stove (different measurement and the component of use position) be in what different level and load fall to compare with vitreous kiln vault, the key is thermomechanical function. To light qualitative layer, because their intensity is higher,1050kgm-3(basically is) . Be similar to the silica brick of high density, pledge silica brick also is to use fireclay agglutinate gently (basically be Q94 class) . In the meantime, in these component, the whole cycling life that pledges silica brick satisfies hot-blast stove gently (namely 8~12 year) .
The advantage of light qualitative silica brick. Light qualitative silica brick has a lot of advantages. Light clay brick cannot be likened to this. The thermal conductance that hole rate is the light qualitative silica brick of 50% about under brick of light qualitative clay. The load of light qualitative silica brick be out of shape temperature 1620-1640 ℃ , and the load of brick of light qualitative clay is out of shape temperature is 1200-1300 ℃ only, do not contract below high temperature, expand when 1450 ℃ (make an appointment with <0.2%) , volume is steady. But clay pledges the brick contracts gently bigger, make lining easy craze. Carry out a proof, below 1550~1600 ℃ condition, pledge silica brick can be used for a long time gently. But the hot surface that direct laid enrages in osculatory furnace, also can use at big span roof. Light qualitative silica brick can be used at cannot using the high temperature room of brick of light qualitative clay. Pledge gently to using argillaceous brick, heating furnace liner pledges silica brick can shorten gently heat periodic, reduce the specific fuel consumption of 35% . Be in firing kiln (kiln pouring blaze) the service life that coping uses light qualitative silica brick to be able to lengthen kiln to support.
The heat that pledges the coefficient of expansion of silica brick is how many object gently bilges cold shrinking is natural phenomenon, light qualitative silica brick is to be used at furnace of kiln of heating furnace roof, hot-blast stove, glass to wait for roof of industrial kiln furnace or kiln furnace, silicon pledges coefficient of expansion is adiabatic brick ≤ 1.3% .
Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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