System for a non-invasive online continuous measurement of phase levels in converters or pyrometallurgical furnaces

• US 20030209078A1
• Filed: 05/13/2002
• Published: 11/13/2003
• Est. Priority Date: 05/13/2002
• Status: Active Grant

• Current Assignee: Escanaba Holdings Incorporated, Saarland Corporation
• Original Assignee: Escanaba Holdings Incorporated
• Inventors: Rojas, Luis Paredes, Garreton, Alfredo Zolezzi
• Granted Patent: US 6,786,082 B2
• Time in Patent Office: Days
• US Class Current: 73/627
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 29/032 by measuring attenuation of acoustic waves
• CPC Class Codes: G01N 29/0609 Display arrangements, e.g. colour displays indicating or recording in connection with measuring in general G01D
• CPC Class Codes: G01N 29/222 Constructional or flow details for analysing fluids optoacoustic fluid cells G01N29/2425

Abstract

A non-invasive online system for continuous measurements of phase levels in a converter or pyrometallurgical furnace in smelting and conversion processes, consisting in a electrical signal generator, transducers that convert said electrical signals in mechanical waves placed on the outer end of air blowing tuyeres, coupling means between said system and the shell of the converter, transducers placed in the direction of the axis orthogonal to the phases plane for applying mechanical waves that travel in a transversal direction into the converter, a mechanical waves sensor placed around the external wall of the shell of the converter that receives the reflected signal, a crystal local oscillator, means for the preamplification of the signal, an analogous/digital interface, a means for data acquisition, a means for processing the signals so as to determine the power of the reflected signal and the propagation time of the signal between the moment it is emitted by the transducer and the moment in which the reflected signals are received by the sensor, a memory means to store the continuous values of the phase levels and a visualisation means for displaying the continuous values of the phase levels.

Claims

1. - A non-invasive online phase level continuous measurement system in a converter or pyrometallurgical furnace, well defined because it consists in:

a) An electric signal generator;

b) At least one transducer that converts said electrical signals into mechanical waves, placed on the external wall of the shell of said converter or pyrometallurgical furnace;

c) Coupling devices between said system to said shell of said converter or pyrometallurgical furnace;

d) At least one said transducer placed in the direction of the axis orthogonal to the phase plane for applying mechanical waves that travel in a transversal direction with the airflow towards the interior of said converter or pyrometallurgical furnace;

e) At least one mechanical wave sensor placed around the external wall of the shell of said converter or pyrometallurgical furnace that receives the signal reflected by at least one of the different limiting zones between the different phases present inside said converter or pyrometallurgical furnace;

f) A cristal local oscillator;

g) A means for signal preamplification;

h) At least one analogous/digital interface;

i) A means for data acquisition;

j) A means for processing the signals so as to determine the power of the reflected signal, and its propagation time between the moment it is emitted by said transducer and the moment in which the signals are received by said sensor;

k) A memory means to store the continuous values for the phase levels; and

l) A visualising means in which to display the continuous values for the phase levels.

2. - A continuous measurement system of claim 1, well defined because the phases have different densities and consist of metal bath, slag and gases.

3. - A continuous measurement system of claim 1, well defined because the mechanical waves are sonic waves.

4. - A continuous measurement system of claim 1, well defined because the mechanical waves are ultrasonic waves.

5. - A continuous measurement system of claim 1, well defined because the mechanical waves are infrasonic waves.

7. - A continuous measurement system of claim 1, well defined because a sensor, at least one, is installed immediately beside each transducer, at least one.

8. - A continuous measurement system of claim 1, well defined because a sensor, at least one, is integrated to the respective transducer.

9. - A continuous measurement system of claim 1, well defined because the determination of the continuous phase levels is related to the position of the transducers.

6. - A continuous measurement system of any one of the preceeding claims, well defined because said pyrometallurgical converter is a Teniente Converter (CT).