What are the latest achievements or directions in the field of increasing resistance to burnout of air tuyeres of blast furnaces and reducing heat losses?
The most widespread wind protection systems are with ceramic layers deposited on plasma jet hooking layers. This measure is doubled by the periodic change for the restoration of these protections and their reuse. Usually this replacement is made at 8 weeks half of their number and the replacement with others where this layer has been repaired. Basically the lifetime of these mouthwashes can be 3 to 5 years. The wind holes to which we applied the protections made by us with metal carbides and graphite - copper composite layers increased the durability of the tuyeres on average at 300 - 400 days at blast furnaces of 2700 and 3500 m3 without being replaced. Best regards Hritac M
Dear Mircea. Your answer is very interested in us. Are you really removing tuyere from the furnace to restore the protective layer? And then install tuyere back into the furnace?
The two solutions made by us result in an increase of the durability in operation of about 8 - months -1 year if we refer to large furnaces 2700 - 3500 cubic meters. As a rule, the replaced tuyeres did not reuse because they had perforations on the wall. Working variants with the replacement of the preventive vent holes are practiced by plants where the protections are made with the ceramic deposited in the plasma jet. We have made some such structures but without good results. In some cases when the windmill extracted from the furnace if did not have the perforated wall and still had some of the metal carbides protection they were reused immediately without repairs. In the attachment you have the picture of such a tuyere.
Dear Mircea. Is natural gas or pulverized coal fed into such a tuyere?
The generation of tuyeres with this protections we have achieved has a history of 6 years of operation of methane gas injected in blast furnaces, and from 1996 to present (we have given information only until 2012) the blast furnaces have worked with coal dust blown through double lances with oxygen jet on the outer spear. Best regards , H Mircea
Dear Mircea, are methane gas and coal dust being fed to tuyere at the same time?
I do not know such tests performed on furnaces at the industrial scale or in the laboratory. The combustion behavior of the two fuels is totally different and therefore difficult to control. So the answer is : нет !
Dear Mircea. In Russia there is a plant where methane gas and coal dust are fed to tuyere at the same time.
OK ! But the reduction of coke consumption corresponds to the cumulative effect of the two components ?
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