Raising steel to wrap liner to use a number is steely cost is reduced in production, raise high yield can one of crucial step. Steel bag liner bears below high temperature condition the concussion of molten steel, chemistry is eroded and thermal stress, accordingly its service life affects the success of steelmaking process directly. Include the use number of liner to raise steel, the following kinds of measure can prolong its life effectively:
1.The chooses fireproof material property that optimizes fireproof material decided steel surrounds the service life of liner directly. The working environment of different area and demand are diverse, should the fireproof material that specific aim ground chooses to suit. Of working layer material optimize: Working layer is steel bag liner is outer, contact with molten steel directly. The material such as brick of pointed spar of tall aluminous brick, magnesian carbon brick, magnesian calcic brick, aluminium magnesium is commonly used at working layer, have sex of exceedingly good the corrode that fight broken bits and heatproof shake sex, can prolong the service life of liner. The promotion of intermediate layer material: Intermediate layer offers the whole that steel wraps to prop up, use the fireproof data that sends density high (like tall aluminous brick or argillaceous brick) the stability that can increase liner, reduce the attaint rate of working layer. Use magnesian carbon brick: Carbolic brick has magnesium to fight molten steel exceedingly goodly to erode function and thermal shock stability, because this is in layer of steel bag job,apply extensively, conduce to the service life that prolongs steel bag.
2.Undertake regularly " heat repairs " heat repairs a technology: Below the case that includes not complete refrigeration in steel, to liner attaint place undertakes local repair, working especially a local damage or erode relatively serious place, use fireproof gush filling makings, daub makings to wait repair a technology can in time repair liner, avoid local attaint broaden the scope. Mechanization repairs: The spray that uses automation fills equipment, can improve the uniformity that repair and efficiency, reduce shutdown time, the waste that also can reduce liner at the same time and material are used up.
3.Control molten steel is pouring when temperature of temperature molten steel is exorbitant, to liner erode aggravate, bring about liner service life to shorten. Accordingly, the heat that can reduce liner through optimizing the control of molten steel temperature is eroded. Temperature of reasonable control molten steel: Avoid molten steel temperature exorbitant or wave motion is too big, as far as possible will pouring temperature control is inside reasonable range, can reduce molten steel so the thermal shock to liner, prolong service life.
4.Decrease to erode steel slaggily inside the bag slaggy have stronger caustic, fall in high temperature especially, slaggy meeting and liner happening chemistry react, bring about liner to corrode. Adjust the alkalinity of slag: Through controlling the alkalinity of slag, especially alkalescent and fireproof material (be like magnesian qualitative firebrick) when using, those who retain residue is alkalescent conduce to reduce broken bits to liner erode. Join protective broken bits: The protective broken bits of certain amount is added in molten steel surface, can keep apart molten steel and airy contact effectively, reduce the aggressivity of broken bits, protect liner.
5.The working environment that improves steel to wrap use environment steel has bigger effect to the life of liner, pass reasonable operation to be able to reduce the loss of liner effectively. Reduce pouring speed: Be in pouring in the process, molten steel is right of liner erode effect is bigger, pouring the wear awaying that speed can quicken liner too quickly. Accordingly, what reduce molten steel appropriately is pouring speed and method of air entire flow, can reduce liner erode. Reduce empty package time: When buy of the sky between steel Bao Changshi, liner is in abominable high temperature or microtherm environment falls, get easily the influence of thermal stress. Accordingly, optimize technological process, the sky that reduces steel bag includes time, can prolong liner life effectively.
6.Improve firebrick build by laying bricks or stones to build craft to change construction subtly: The step that includes liner in steel builds a course in, must ensure the build by laying bricks or stones of firebrick builds mass, the brick is seamed should even, build by laying bricks or stones builds a layer to answer firm joint. Strict control brick is seamed width and expand seam a setting, reduce build by laying bricks or stones to build stress concentration, prevent the craze that liner causes because of thermal stress. Prefabricated component uses: The crucial area that includes in steel (if wrap bottom or Bao Bi) use fireproof prefabricated component, can make sure build by laying bricks or stones builds quality consistency, increase the structural stability of liner, prolong service life.
7.Steel wraps the thermal shock stability that increases liner to bearing in use process frequent temperature changes, poor fireproof material is in thermal shock stability easily to craze happens in temperature wave motion or flake. Use pointed spar brick or magnalium brick: These material have superior heatproof shake performance, can reduce the liner damaged that causes because of thermal shock, below the circumstance that the bag heats quickly and cools in steel especially, can improve service life effectively.
8.Check regularly and safeguard detect regularly liner condition: In steel the bag is used every time hind, the wear out condition that answers liner undertakes checking, the area that is damaged easily especially, if wrap bottom of wall, bag to wait, discover the problem is handled in time. Introduce the online system that monitor: Modern steel bag is safeguarded can use temperature sensor, heat to become wait for the online equipment that monitor like appearance, steel of real time monitoring includes the use case of liner, prevent ahead of schedule and handle liner attaint.
9.The structural design that optimizes steel to wrap design steel also can affect the service life of liner. Through optimizing the geometrical form that steel includes and design, can reduce molten steel and broken bits to be mixed to the immediate impact of liner wear away. Improve way of going from place to place: Through optimizing molten steel method of going from place to place is designed, the onflow that reduces molten steel and to liner erode, include mouth and bag bottom area in steel especially. Reduce extent of local tall stress: Avoid to produce section of local tall stress when the design, wrapping bottom and bag wall boundary especially, in order to reduce the liner damage that stress brings centrally.
The choice that sums up the measure that raises steel to wrap liner to use a number to include to optimize fireproof material, fixed undertake heat is repaired, reasonable control molten steel is pouring temperature, decrease slaggy erode, ameliorative use environment, raise build by laying bricks or stones to build the quality, thermal shock that strengthens firebrick stability, fixed detect liner condition and optimize steel. Integrated these measure, can lengthen steel effectively to surround the service life of liner, reduce manufacturing cost, promote the efficiency of steel-making.
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