Device and method for cooling fume intakes
Inactive Publication Date: 2001-11-08
DANIELI & C OFF MEC SPA
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Problems solved by technology
Such phenomena are in particular a contaminants in scrap or during melting operations.
In addition, fluid dynamic phenomena of turbulence are generated in the intake which are assumed to increase the erosive effect of the fumes on the walls of the cooling tubes.
Another factor increasing the damage caused by the corrosive phenomenon is the presence of irregularities caused by the corrosion due to pitting, which results in a localized and perforating form of damage.
The corrosion due to pitting can perforate the tubes causing leakages of water, which still further accelerate the kinetics of corrosion, also in relatively new tubes.
Stainless steels are not recommended for applications in environments where it is necessary to combat the effects of sulphuric acid.
These steels are very costly and offer good resistance to corrosion only at low temperatures and when the corrosive solutions are very diluted.
However, such alloys have low surface hardness, and hence low resistance to erosion, as well as a high cost.
Cobalt-based steel alloys, in particular Co--Cr ones, yield good results, but their cost, which is even higher than that of nickel-based steel alloys, renders their use far from economic.
The use of refractory material for protecting the tubes, albeit a relatively low-cost solution, has failed to yield good results because it involves a big reduction in the capacity for transfer of the heat of the coolant.
The disadvantage of the latter solution is its higher cost, and the increase in overall dimensions, weight and costs that it involves for the fume-abatement system, as well as the reduced capacity for transfer of thermal energy.
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[0024] With particular reference to FIG. 1 above, a cooling device for fume intakes according to the invention, designated as a whole by the reference number 1, comprises an intake or pipe 2 for the evacuation of the fumes generated in a foundry furnace of the electric-arc ladle type or the like (not illustrated), and a tube or pipe 3 containing the coolant 9, in general water, which circulates in the direction indicated by the arrows 10.
[0025] The tube 3 is wound in a spiral and extends advantageously throughout the length of the intake 2. The spirals of the tube may be made with a suitable pitch to obtain the best cooling effect, or may also be set in contact with one another. The tube 3 is provided with an inlet 4 for the liquid and with an outlet 5 by means of which it is connected to a system for supplying forced circulation of water (not illustrated). The current of the fumes evacuated from the furnace enters the intake from the inlet 6 and comes out from the outlet 7, followi...
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Abstract
A cooling device for fume intakes for exhausted gases from foundry furnaces comprises a flue pipe for extracting the fumes produced in premises containing a source of fumes, a cooling system consisting of a tube made of steel lined in appropriate areas of its surface and length and wound in a spiral. In the tube there circulates cooling water with a temperature of the water at entry and in operation kept constantly between 50 and 120° C., with a temperature variation between the inlet and the outlet of the tube in a range of 10-30° C. The lining of the tube may be made of special martensitic stainless steel, or of glassy alloy, or of Ni / Cr cermet.
Description
SCOPE OF THE INVENTION[0001] The present invention refers to a cooling device for fume intakes of the water-tube type, in particular for exhausted fumes from foundry furnaces, and to the corresponding method of use.STATE OF THE ART[0002] In intakes or pipes for extraction of high-temperature fumes generated in the furnaces of foundries, forced-cooling systems are provided consisting of pipes or ducts which are set in the intakes and in which water under forced circulation is made to flow. These ducts, which in general are made of steel, are wound in spirals, or else arranged in another way, and are enveloped by the current of fumes that comes out of the furnace.[0003] The fumes are rich in CO and also contain ot components, such as sulphates and chlorides, whic conditions, produce corrosive substances, such as acid. Consequently, the intakes for discharging furn of foundry plants that are very subject both to erosio phenomena. Such phenomena are in particular a contaminants in scrap...
Claims
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Login to View More IPC IPC(8): F23J15/06F24B9/00F27B9/24F27D9/00F27D17/00F27D21/00
CPCF23J15/06F23J2213/203F23J2213/30F24B9/006F27B9/2415F27D17/002F27D21/0014F27D2009/0018Y02E20/363
InventorPOLONI, ALFREDOLARA, ALEJANDRO SANZ
OwnerDANIELI & C OFF MEC SPA