Metallurgical apparatus – With control means responsive to sensed condition – By treated material sampling means
Patent
1992-09-08
1994-09-06
Kastler, Scott
Metallurgical apparatus
With control means responsive to sensed condition
By treated material sampling means
266 80, C21C 552
Patent
active
053441222
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns devices for sampling and analyzing fumes and more particularly, it relates to a tubular rod for sampling fumes in a duct for the evacuation of fumes, typically at the outlet of a furnace for the treatment of materials, such as in metallurgy.
A device and a tubular rod of this type are described in the document GB-A-1,370.658.
The reliability of such a device depends largely on the mechanical resistance as well as the resistance to plugging due to the dusts which are present in the fumes of the sampling rod. As a matter of fact, in particular with metallurgical furnaces, the sampling of the fumes is carried out in a gas flow whose temperature varies, during one cycle, by a multiple of ten minutes in metallurgy, between room temperature and very high levels, sometimes higher than 1600.degree. C. Moreover, the sampled fumes are extremely loaded with metallic dusts, at rates which can reach 250 g per Nm.sup.3, as well as water (up to 20% in certain applications). For these reasons, presently, no device for the continuous analysis of fumes is available on the market in spite of their immediate interest for the study and optimization of the effects
on the environment of emission of fumes, to provide a better knowledge of the process which generates fumes, while enabling its optimization, and making it possible to control process parameters as a function of the analysis, such as the injection of post-combustion oxygen in arc furnaces for the production of steel or ferro-alloys.
It is a first object of the invention to propose a construction of sampling tubular rod of simple and strong design, having a long life span and a limited susceptibility to plugging.
For this purpose, according to a characteristic of the invention, the tubular rod includes an extractor tube extending in a closed sleeve having a main part provided with an axis and comprising an inlet and outlet for cooling fluid, the extractor tube having an end part leading through an opening outside the sleeve and a connecting part extending outside the main part of the sleeve, at least the connecting part being typically coaxial with respect to the axis of the main part of the sleeve.
It is another object of the present invention to provide a device for sampling and analyzing fumes of increased reliability incorporating such a sampling tubular rod.
According to a characteristic of the invention, such a device for sampling and analyzing fumes in an exhaust duct for fumes defining a fumes trajectory, includes at least one tubular rod as defined above, mounted on the duct, with the opening leading into the trajectory of the fumes, the device typically including at least a suction means connected to the extractor tube of the tubular rod and to a system of analysis.
It is another object of the present invention to provide an apparatus for the production of steel or ferro-alloys enabling an optimized control of the production process.
For this purpose, according to a characteristic of the invention, such an apparatus comprises an arc furnace provided with a duct for the exhaust of fumes, and a device for sampling and analyzing fumes such as defined above, and typically means for injecting oxygenated gas into the furnace and adjustable means for feeding oxygenated gas associated with the analyzing device.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will appear from the description which follows of embodiments, given by way of illustration but without limitation, with reference to the annexed drawings, in which:
FIG. 1 is a schematic illustration of an apparatus for the production of steel or ferro-alloys according to the invention;
FIG. 2 is a longitudinal cross-section view of a first embodiment of a sampling tubular rod according to the invention;
FIG. 3 is a vertical cross-section view of an embodiment for mounting a tubular rod according to FIG. 2, in a system of extracting fumes from a furnace;
FIG. 4 is a partial view of a variant of an embodiment of the tubular rod of FIG. 2;
F
REFERENCES:
Patent Abstracts of Japan, vol. 11, No. 268, Apr. 4, 1987, 62-74020, Mitsubishi.
Devaux Michel
Perrin Nicolas
Vuillermoz Jean-Claude
Kastler Scott
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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