Hot-blast stove can use what firebrick, what feature is there?

From 20 centuries since 80 time, the air feed temperature of hot-blast stove is rising all the time, it is ℃ of 1200 ℃ ~1250 commonly, and the ℃ of 200~300 of upside tower above of hot-blast stove and regenerator. Below so high thermic load, the upside of hot-blast stove uses the brick of low creep tall aluminium of silica brick or 1400~1500 ℃ commonly.


Hot-blast stove type is abounded ceaselessly and develop. According to the different form of firebox and regenerator, can divide for inside light, outside outside lighting, be lighted and support light. Hot-blast stove is lighted to already developed from hemisphere roof hot-blast stove inside now, improve inside light hot-blast stove (hot-blast stove is lighted inside roof of catenary of suddenly Ge Wen namely) , lining also has roof of board wall, partition, articulatory brick; Hot-blast stove is lighted to also have a few kinds outside; In recent years, domestic top lights hot-blast stove to also use Kalujin (Wukelan) , 450m3 is the following, the part uses ball hot-blast stove (fireproof ball diameter makes an appointment with 40~60mm) .
The main characteristic of fireproof material is (1) fireproof sex. Fireproof material must have hot-blast stove taller fireproof sex and load bate temperature, be in especially the position with high temperature larger load, fireproof material should have taller fireproof sex and load bate temperature; (2) fights creep. Choosing hot-blast stove when fireproof material, must notice its fight creep index, its creep temperature should prep above works actually temperature 100 ℃ . Silica brick has the good denaturation that fight squirm, apply to high temperature place; Argillaceous brick fights creep sex to differ, use at only commonly in microtherm place. (3) bulk stability. The heat of fireproof material expands on the bulk change that characteristic and direct system spends change to bring in temperature of build by laying bricks or stones now. Inside working temperature span, the hot coefficient of expansion of fireproof material should lesser. (4) thermal conductivity. Thermal conductivity is good, hot exchange ability is strong, fireproof material has good heat-resisting to pound a gender. The position with tall to temperature, big change, should choose the stuff with good thermal conductivity; Fireproof material thermal conductivity differs heat-insulation layer. (5) thermal capacity. Fireproof material has capacity of stronger accumulation of heat strong, checker brick should use the fireproof data with large thermal capacity. (6) compressive strength. Pressure of bottom of hot-blast stove regenerator is greater, should choose the fireproof stuff with expensive compressive strength, if bottom of regenerator of big blast furnace often uses a few tall aluminous bricks. Next watches listed the main character of commonly used and fireproof material mixes hot-blast stove use place.
Hot-blast stove is fireproof structure of system of material build by laying bricks or stones is current structure of system of fireproof material build by laying bricks or stones has hot-blast stove of our country high temperature basically two kinds (arrive from high temperature area microtherm area) : (1) silica brick - brick of low creep tall aluminium (intermediate) - tall aluminous brick - argillaceous brick; (Brick of tall aluminium of 2) low creep (high-grade) - brick of low creep tall aluminium (intermediate) - tall aluminous brick - argillaceous brick. A few hot-blast stove use andalusite brick or brick of silicon line stone in the position that uses brick of low creep tall aluminium. From the point of use effect and investment cost, because rate of silica brick creep is low, high temperature falls to use bulk stability for a long time, thermal stability is good, firebrick is low-cost, high temperature area uses silica brick (ball) better.
Hot-blast stove is fireproof the performance demand foundation of material is current the use circumstance of hot-blast stove, hot-blast stove basically has the following to the requirement of material of accumulation of heat (at 4 o'clock) : 1) have good bulk stability, use in high temperature namely in won't permanent because of the change of structure of in-house brilliant photograph expand and contract, make brick of accumulation of heat and body of build by laying bricks or stones have good bulk stability. It is good that 2) fights function of creep of high temperature load. Performance of 3) accumulation of heat is high, requirement material density is high, specific heat capacity is high. 4) coefficient of thermal conductivity is tall, make body of build by laying bricks or stones of accumulation of heat is mixed with higher rate in heat exchanger cycle efficiency absorbs quantity of heat. The structural type of hot-blast stove and attaint are primitive. Hot-blast stove is type of a kind of accumulation of heat heat exchanger, carry high temperature air for blast furnace ceaselessly, yes. - pillar shape structure, by inside light room and regenerator composition. Tall 25-50m, diametical 6-12m. Have kind of 3 kinds of structures: Light inside, outside light and the top is lighted. Before two kinds are common. Current, one's duty of our country greater part lights hot-blast stove is inside light hot-blast stove. The portion that hot-blast stove burns to damage more easily inside is shade wall, the vault that hot-blast stove is being lighted outside is two rooms and part crossing the bridge. The reason that hot-blast stove damages has a lot of, include thermal stress (hot-blast stove liner and checker brick room are in abrupt refrigeration and abrupt hot change) . Crackle of body of build by laying bricks or stones, crackle and flake, especially sufficient inside the partition that lights hot-blast stove, become loose more likely and body of dump build by laying bricks or stones. Bring about short circuit even, be forced to stop to safeguard; Chemistry erodes combustion (combustion product small ash is little adherent in bricky surface) ; Mechanical load (checker brick strength is great) , body of build by laying bricks or stones is out of shape, crackle and attaint. Hot-blast stove uses fireproof material and development. Hot-blast stove is fireproof material basically depends on hot air temperature. When wind lukewarm under 900 ℃ when, use clay brick; When ℃ of 900-1100 of wind Wen Wei, tall aluminous brick and Mo Laishi brick choose lining brick and checker brick; When ℃ of 110D of wind lukewarm prep above, choose tall aluminous brick, Mo Laishi brick and silica brick to serve as lining and checker brick. After wind temperature rise is fast, lining of high temperature part, furnace is earthed up, checker brick uses silica brick build by laying bricks or stones to build commonly, microtherm part still uses argillaceous brick. Hot-blast stove is lighted to use tall aluminous brick and argillaceous brick build by laying bricks or stones to build commonly inside our country, part of hot-blast stove high temperature is lighted to use silica brick build by laying bricks or stones to build outside, microtherm part still uses tall aluminous brick and argillaceous brick. In addition, fireproof material is using indeterminate form at hot-blast stove gradually.
Fireproof material is in hot-blast stove is other the type of place is fireproof the other part of material is to point to a powerful person of sirocco canal, sirocco, utterance and chimney, they are to carry sirocco and the hot tube that discharge waste gas and establishment. The 3~4 that every blast furnace uses hot-blast stove is common a chimney, the job of every hot-blast stove is controlled by sirocco a powerful person and flue door. (1) sirocco canal uses fireproof data. Include to send wind to raise sirocco of canal, director, blast furnace to surround a canal to wait. Heat-insulation layer liner is the brick of argillaceous heat preservation of 70~300mm, working layer ply is 70~170mm, use argillaceous brick build by laying bricks or stones to build commonly, but tall aluminous brick or application of Mo Laishi brick are exported at sirocco and total wind is in charge of interface. Crawl of blast furnace sirocco and send wind to raise a canal to use tall aluminous cement or phosphate fireproof irrigate build material to irrigate build, service life is 1~3 year. In addition, sirocco pipe fittings or turn partial liner is used fireproof irrigate build material spot to irrigate build, integral amount is good, use effect is good. (2) sirocco a powerful person uses fireproof data. Firebrick is mixed in the function in hot-blast stove of Japanese blast furnace use place. Sirocco a powerful person is double-faced heat, also bear the mechanical vibration, thermal stress that wears away to be caused with temperature change, working condition is poor. Line of a powerful person uses argillaceous brick or build by laying bricks or stones of tall aluminous brick is built, service life is 6~10 month. Line of sirocco a powerful person uses alumina cement commonly fireproof irrigate build prefabricated component, service life can amount to 1.2~2.5 year. (The fireproof material of 3) flue and chimney. Flue and chimney are the passageway that discharges waste gas. Hot-blast stove uses next smoke evacuation means, every hot-blast stove sets flue, waste gas passes total flue from chimney eduction. Flue liner uses argillaceous brick build by laying bricks or stones to become normally. Chimney uses concrete to irrigate commonly build or red brick build by laying bricks or stones is built, next line are covering layer with argillaceous brick.
Hot-blast stove is fireproof material develops the past, fireproof material basically is our country hot-blast stove argillaceous brick, checker brick is a shape flat brick, breed is relatively onefold, satisfy basically the wind of 800~900 ℃ is warm at that time requirement. 20 centuries 60 time, as a result of the application of technology of blast furnace hair drier, wind is warm rise greatly, part of hot-blast stove high temperature begins to use build by laying bricks or stones of tall aluminous brick to build. Checker brick also develops integral perforation brick from board brick, satisfy wind basically the requirement of lukewarm 100~1100 ℃ . 20 centuries 70 time, jiao Lu transplants with silica brick and apply at hot-blast stove, make the fireproof material of hot-blast stove reached a new level. 80 time mix 20 centuries 90 time, fireproof material obtained hot-blast stove to enter particular case newly to be as follows: (1) development develops brick of low creep tall aluminium; (The application of paint of spray of 2) pottery and porcelain; (3) combines the application of brick and abnormity firebrick; (4) replaces the application of checker brick with fireproof ball. As the development of high temperature technology, silica brick replaces vault, on the brick of low creep tall aluminium of the high temperature place such as regenerator of high temperature area, sirocco canal uses brick of low creep tall aluminium or andalusite brick. Meanwhile, hot-blast stove begins to use with firebrick 19 or 37 aperture checker brick replaces a tradition 7 with 9 aperture brick.