F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
38/20, 38/37
F27D 7/00 (2006.01) C21C 5/56 (2006.01) F27D 1/18 (2006.01) F27D 13/00 (2006.01)
Patent
CA 1239536
ABSTRACT OF THE DISCLOSURE The invention relates to a method and a device for scrap preheating by means of hot gases, preferably steel furnace exhaust gases. The preheating is accomplished in a preheating chamber (1) for a scrap bucket (2) having bottom structure permitting passage of gaseous medium there through and a level seating surface (24) at its top edge. The chamber is closed by a cover (3) including an inner hood (28), a depending outer cover plate (36) and a partition wall (42) projecting downwardly between the hood and the plate. The cover engages the chamber with an exterior sealing at the water seal (16,38), a first seat (50) at the hood (28) and a second seat (44) at the partition wall (42) against the seating surface (24) of the scrap bucket (2). The seats delimit an inlet space (A) above a scrap charge (Q), an outlet space (B) outside the scrap bucket (2) and an intermediate annular space (C). The intermediate space is provided with an inlet pipe (54) for a purging medium with a flow control damper (56). The damper is monitored by a pressure regulating device (74), which is connected to a pressure sensing means (66 and 68) below the hood (28) and in the intermediate space (C) respectively. In operation hot gases flow through the scrap charge (Q). There is then a higher absolute pressure in the inlet space (A) than in the outlet space (B). In order to prevent preheating gases from passing through the first seat (50) and consequently bypassing the scrap charge (Q) without giving off their heat content, purging medium is supplied to the intermediate space (C). By means of the damper (56) and the regulating device (74) the pressure is adjusted in the intermediate space (C), in order to make it not substantially less than the pressure in the inlet space (A). Consequently, virtually no leakage between from inlet space (A) into the intermediate space (C) takes place. All leakage consists of purging medium, which leaks out to the outlet space (B) past the second seat (44). According to a particularly preferred embodiment in the inlet pipe for purging medium is connected to the outlet space (B) and includes a fan (60) for pressure elevation, and consequently, a closed circuit is obtained (Figure 2).
509419
Flakt Ab
Gowling Lafleur Henderson Llp
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