Boiler liner is easy wear away to have very big concern with select material, construction, drying-out, fireproof material can reduce the wear-resisting with right choice maintenance frequency, furnace letting kiln produces more economic value.
Furnace is to use coal to make fuel for the most part, minority uses heavy oil or gas, basically be in charge of the composition such as system, firebox, flue, dust collector by boiler. As a result of the abrasion of fireproof material, make the operating mode inside the furnace of the material that add fire is: The ℃ of working temperature 900~1050 inside ① boiler the chamber of a stove or furnace; There is oxidation reducing atmosphere inside ② the chamber of a stove or furnace; ③ flue gas erodes, bump: The chamber of a stove or furnace is general 3~6m/s, segregator is 20-30m/s. Soot is erosive, it is to point to what angle pounds material surface and cause to fluid or solid grain are mixed with fixed rate wear away. Erosive wear away: Of grain and solid surface bump angle small, be close to parallel. When perpendicular cent fast when as joint as tangent cent speed action, grain produces dig to cut action to solid surface, make fireproof material is destroyed gradually. Collision wears away: Concussion part is large, adjacent and perpendicular. Particle bumps solid surface with fixed rate, cause crackle and be out of shape. Pound surface of broken bad solid for long, be out of shape the layer falls off.
Of fireproof material wear away its destroy means to basically have: ① heat comes off; ② structure comes off; ③ mechanical stress comes off. When boiler starts, stop the temperature when machine change is sharp, be heated not all, make fireproof material interior produces temperature rise difference, produce stress thereby, cause fireproof craze, flake. The organization comes off is when showing boiler is used for long, data varies into cent happening (qualitative change) , exterior material falls off. As a result of fireproof material and metallic structure (measure component of lukewarm, pressure, fireproof material to catch a hammer to wait) hot coefficient of expansion is different, brought about fireproof material craze.
When the boiler below 1400~1600 ℃ burns, furnace wall bears high temperature thermic load. High temperature airy is erosive with wear away, chemistry of broken bits dirt is corroded. So, firebox liner uses build by laying bricks or stones of brick of one class clay to build commonly, others uses three-layer clay brick and flue job layer. As a result of the development of craft, at present a few boiler are used between 1710~1790 ℃ fireproof but plastic or fireproof pouring makings. Flue scaleboard uses clay earth of qualitative tall aluminous cement is pouring makings mould. Be in to specific work temperature of 1300~1400 ℃ before arch, binder of usable tall aluminous cement, phosphate or tall aluminium are qualitative pouring makings make.
Tall aluminous cement or phosphate are fireproof and pouring makings, others uses silicate cement or earth of tall aluminous cement and binder have line step. To the microtherm place of general boiler, usable pledge gently fireproof and pouring makings or warming plate serve as lining. Layer of heat insulation of the build by laying bricks or stones outside high temperature area. It is the boiler of fuel with gangue, because gangue contains ash more, calorific quantity is inferior, use fluidized-bed combustion boiler. When high temperature, gangue particle reachs furnace wall to conduit heating surface wear away very serious. Run one year, fireproof material wears away 60~2mm, surface of conduit be heated wears away 60~2mm. Can not burn build by laying bricks or stones of tall aluminous brick to build wall of boiling layer week with water glass or phosphate. Carborundum of phosphate of besmear of wall of conduit of face shape be heated or covering layer of fire prevention of aluminous earth grog, general ply is 40mm. Such, can make life times add.
In a word, use adventitious fireproof material regards boiler as lining, its service life can raise 3~5 commonly times. Additional, can be in the spot is pouring, also but prefab assemble, construction rate is rapid, quality is good, if whole is pouring, integral sex is strong, air-tightness is tall; Layer of integral sex heat insulation, adiabatic effect is good, fall coal consumption, energy-saving source.
What part needs furnace is wear-resisting fireproof material? Right bear press a component to fight wear away fireproof material also has the wear-resisting of the design at the same time inferior and adiabatic function, accordingly, of boiler conduct heat insusceptible. Should fight grind fireproof material cladding to basically be used at firebox and segregator of wind of steam Leng Xuan. In the close look area of firebox, fuel of stock, fill and limestone mix, next liquefaction, among them air current be ascendanted takes away lesser grain; Heavier grain falls wind board surface, and here grain has intense abrasiveness, so of fireproof material cover range only then Yu Bufeng board, be down outspread the boundary of the perpendicular wall to firebox and inclined wall.
Will change direction in screen heating surface to direction of inhomogenous going from place to place as a result of the grain on the bed and tilt, cause wear and tear thereby, below this kind of circumstance, prevent through increasing grind the method such as pin is added to achieve inside lid, cover prevent grind a purpose. When collecting the chamber of a stove or furnace to export as a result of soot, carry what not directional particle will produce certain level to the chamber of a stove or furnace inevitably to wear away, standing by the two side of exit so, on, issue each to have fireproof covering layer. Overheat screen, heat screen and evaporate screen bottom bends and as perpendicular as direction of smoke screen flow, wear away heavier, this area also should be enclothed wear-resisting, fireproof wait for material. In addition, in wind cold broken bits implement in, cold broken bits implement lumen reachs wall to wait to all use wear-resisting fireproof material is enclothed.
Fireproof material occurrence craze, fall off, easy how to wear away to do? Flourish Cheng Naicai is dug from germ, the analysis gives real reason, travel of destiny of birthday of furnace letting kiln is longer! Zhengzhou flourish fills kiln furnace fireproof data limited company is engaged in be able to bear or endure service of timber production, research and development is old, welcome communication of technology of broad new old friend to reach seek advice.
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