Converter is the main smelt container of steel-making, its furnace life is affecting the manufacturing organization of steel-making directly, because this converter furnace life is,measure economic norms of a of converter steel-making omnibus technology. From 1991 American LTV steely company is used splash broken bits to protect furnace technology, since our country used this technology 1995, converter steel-making production produced qualitative leap, furnace life had rise substantially, ton steel lining is used up also reduce substantially. But produce in domestic iron and steel can considerably superfluous today, tall furnace life of one-sided pursuit converter is worth while, it is a problem that is worth deliberate.
Furnace life of some steelworks converter and splash broken bits + the comparative figure that furnace compiles time
Graph furnace life of converter of 1 some steelworks and splash broken bits + the comparative figure that furnace compiles time
Cost of labor of furnace of some steelworks converter and furnace life relation pursue
Graph cost of labor of furnace of converter of 2 some steelworks and plan of furnace life concern
Graph 1 with the graph 2 gave out respectively some converter furnace life and splash broken bits + the comparative figure that furnace compiles time and furnace labor cost and plan of furnace life concern. Can see by the graph, no matter be in working hours the respect still is in,fireproof material uses cost field, converter has economic furnace life (it is cost the furnace life) with low, great benefit, continue to improve furnace life again, can increase cost of filling makings of the cost that splash broken bits and gush, vulcanize makings and furnace to build time substantially, make fireproof material uses cost to rise and increase of furnace life as converter thereby.
Graph 3 gave out the temperature that the condition that splash broken bits is not to fall after some steelworks ends through measuring tapping actually drops curve, the condition that splash broken bits falls to drop to the temperature after splashing broken bits to end from tapping about 300 ℃ , ambitious Yu Fei splashs the 200 ℃ Wen Jiang below broken bits condition. Steel-making regards high-energy bad news as the industry, splash broken bits to protect heat technique to be opposite energy-saving decreasing is adverse however for the platoon, it is to throw the stuff that splash broken bits no matter, still carry a gun on the head to blow gas to splash broken bits to be able to make converter Wen Jiang is accelerated, increase the hot loss of converter, cause loss of the sources of energy secondhand thereby. In the meantime, splash broken bits to protect furnace to need to use a large number of splashing broken bits guards furnace data, basically be to burn dolomite material gently, cause waste of many natural resources and environment to destroy.
Be not change of temperature of lining of the converter below the condition that splash broken bits
Graph 3 blame splash change of temperature of lining of the converter below broken bits condition
In metallurgy effect and cost respect, a few viscosity in splashing broken bits to protect furnace process are big slaggy stay in hearth, cause hearth to rise. Hearth rises easy jam the bottom is blown breathe freely brick, right answer play metallurgy effect the impact is very big. Use normally after splashing broken bits to protect furnace technology, the bottom is blown breathe freely bricky life all 3000 furnace of ≤ . This is meant from 3000 furnace later, answer play the effect greatly abate do not have completely even. Steelworks of beautiful country land is being used after splashing broken bits to protect furnace technology, of terminus of blowing mild steel [%C] · [%O] is on average 0.0043, this can think to be withheld basically no longer answer blow converter the sort of apparent metallurgy feature. This namely why Japan and European major steel mill do not want to adopt the prime cause that splashs broken bits to protect furnace technology. Additional, after splashing broken bits, because broken bits is medium TFe content is high, the meeting when treating refine causes the scale that burns steel to rise to blow oxygen blandly to rise, in bringing about molten steel [O] rises, affect molten steel quality thereby. Additional, wait for harmful element rich market because of the S in broken bits, P, smelt difficulty increases in the meeting when smelt, increase relevant the affiliation of complementary makings is measured. Cause cost to increase, especially the steel of extremely low to smelt P and extremely low S is planted for, the adverse effect that brings possibly because of the S in broken bits and P, the smelt difficulty that increases steel to plant directly or cannot succeed smelt.
Converter produces an organization to want to consider Tiegang to balance. When steelworks is designed, use 1 or when 2 converter are produced, the Tiegang when furnace is repaired builds what accomplish very hard evenly, splashing broken bits to protect furnace technology still is significant. If timing consideration is set in steelworks 3 or 4 converter production, when furnace of a converter is repaired, other converter produces completely OK and contented Tiegang to balance. Accordingly, to the steelworks that gives priority to with rolled steel of smelt high-quality goods, converter splashs broken bits to protect furnace craft is not need. Can serve as what circumstance of a kind of lash-up falls to remedy a method only, but when the design must splash broken bits to protect furnace equipment to consider to go in.
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