Forced cooling panel for lining a metallurgical furnace

A forced cooling panel for lining a metallurgical furnace comprising:

• a lining element having a hot face adapted to face a furnace interior and a cold face adapted to face a furnace wall,
• said element comprising a plurality of at least three metal pipes disposed in generally parallel, eccentrically spaced apart non-contacting relation,
• said pipes being interconnected to define a continuous passage for flow of cooling liquid,
• spacer elements disposed between adjacent eccentrically spaced pipes on said cold face, and
• a plurality of spaced apart protuberances projecting from said hot face, said protuberances providing an anchoring system for preapplied refractory material or splashed on solidified slag,
• said protuberances extending generally diagonally of said pipes, and being of generally circular cross-section and welded to said pipes, the protuberances on adjacent eccentrically spaced pipes extending in opposed diagonal directions thereby defining a zig-zag flow path for liquid slag.

A forced cooling metallic lining panel for partial or total lining of a metallurgical furnace, especially a steel scrap and prereduced sponge iron melting Electric Arc or Plasma Arc Furnace, comprising:

• (a) a forced cooling lining element having a hot face and a cold face and comprising at least three seamless boiler type pipes arranged in generally parallel, eccentrically spaced, non-contacting relation;
• (b) said eccentrically spaced pipes of the element being arranged in a non helical arrangement;
• (c) said eccentrically spaced neighbouring pipes of the element being interconnected by welded mitres and elbows in series and series-parallel internal passages;
• (d) said eccentrically spaced neighbouring pipes of the element being separated from each other with circular spacers, located between pipes on said cold face;
• (e) said eccentrically spaced neighbouring pipes of the element and the separating circular spacers being joined together by intermittent and alternating welds;
• (f) said eccentrically spaced neighbouring pipes of the element being mechanically protected by a multitude of spaced apart protuberances disposed diagonally of the pipes of circular cross-section, the protuberances being welded to the individual pipes on said hot face;
• (g) said protuberances defining an anchoring system for initially deposited refractory material or splashed on solidified slag, and
• (h) the protuberances on adjacent eccentrically spaced pipes extending in opposed diagonal directions thereby defining a zig-zag flow path for liquid slag.

A forced cooling metallic lining panel for partial or total lining of a metallurgical furnace, especially a steel scrap and prereduced sponge iron melting Electric Arc or Plasma Arc Furnace, comprising:

• (a) a forced cooling lining element having a hot face and a cold face and comprising at least three seamless boiler type pipes arranged in generally parallel, eccentrically spaced, non-contacting relation;
• (b) said eccentrically spaced pipes of the element being arranged in a non helical arrangement;
• (c) said eccentrically spaced neighbouring pipes of the element being interconnected by welded miters and elbows in series and series-parallel internal passages;
• (d) said eccentrically spaced neighbouring pipes of the element being separated from each other with circular spacers, located between pipes on said cold face;
• (e) said eccentrically spaced neighbouring pipes of the element and the separating circular spacers being joined together by intermittent and alternating welds;
• (f) said eccentrically spaced neighbouring pipes of the element being mechanically protected by a multitude of spaced apart protuberances disposed diagonally of the pipes of circular cross-section, the protuberances being welded to the individual pipes on said hot face;
• (g) said protuberances defining an anchoring system for initially deposited refractory material or splashed on solidified slag,
• (h) an automatic flow control device for variable controlled flow of a liquid coolant;
• (i) said automatic flow control device being adapted to control the variable flow component of the liquid coolant through the internal passages at a point adjacent to the exit port of the element;
• (j) said element having a predetermined size to provide in conjunction with the lowest desired temperature of coolant liquid at the exit port, a constant uncontrolled basic flow in the liquid coolant;
• (k) said automatic flow control device being a bimetallic or expansion material actuated automatic fluid flow control thermostat;
• (l) said automatic fluid flow control thermostat being an integral and constituent component of the element;
• (m) said automatic fluid flow control thermostat having a permanent, uncontrolled and calibrated direct flow-through passage opening for uncontrolled basic flow of liquid coolant through the element;
• (n) said automatic fluid flow control thermostat having a variable by-pass passage for control of the controlled variable flow of the liquid coolant through the element;
• (o) said thermostat being directly controllable by the temperature of the discharge cooling liquid flowing from the element through said direct flow-through passage;
• (p) said variable by-pass passage when fully open being capable of providing supplementary flow of the discharge coolant for assuring safe and adequate heat extraction from the element at maximum thermal loading of the hot face of the element;
• and
• (q) said thermostat being disposed together with a coolant discharge circuit safety relief valve, in one functional unit, the safety relief valve being hydraulically connected between said exit port and said thermostat.

In a metallurgical furnace having a metallic lining comprising at least one lining panel having internal passages for flow of a coolant liquid, the improvement wherein said panel includes an automatic flow control device adapted to provide a variable controlled flow component in said coolant liquid,

• said automatic flow control device being adapted to control the variable flow component of the liquid coolant through the internal passages at a point adjacent to an exit port of the panel;
• the passages having a predetermined size to provide in conjunction with the lowest desired temperature of coolant liquid at the exit port, a constant uncontrolled basic flow in the liquid coolant,
• said automatic flow control device being an automatic fluid flow control thermostat having a permanent, uncontrolled and calibrated direct flow-through passage opening for uncontrolled basic flow of liquid coolant through the panel passages;
• said automatic fluid flow control thermostat having a variable by-pass passage for control of the controlled variable flow of the liquid coolant through the panel passages;
• said thermostat being directly controllable by the temperature of the discharge cooling liquid flowing from the panel through said direct flow-through passage;
• and
• said variable by-pass passage when fully open being capable of providing supplementary flow of the discharge coolant for assuring safe and adequate heat extraction from the panel at maximum thermal loading of a hot face of the panel.