Abstract:
A device (10) for distributing charge material into a shaft furnace comprises a main housing (12), a distribution chute, a suspension rotor (18) and an adjustment rotor (26), which are rotatable about a substantially vertical axis. The chute (32) is suspended to the suspension rotor (18) to rotate therewith for circumferential distribution of charge material and adjustable in orientation through the adjustment rotor (26) for radial distribution of charge material. A differential gear (72) interconnects the suspension rotor (18) and the adjustment rotor (26) and is configured to transmit to the adjustment rotor the same speed of rotation that is imparted to the suspension rotor by a main rotation drive (60) unless an adjustment drive (80) imparts differential rotation to the adjustment rotor. According to the invention, the device includes: - a first gear casing (50) arranged on the main housing (12) and enclosing a gear mechanism (52) that connects the main rotation drive (60) to a first output shaft (54) that protrudes into the main housing (12) where it is connected to a gearwheel (62) that meshes with a first gear ring (64) on the suspension rotor (18); - a second gear casing (70) arranged on the main housing (12) and enclosing the differential gear (72) that connects the adjustment drive (80) to a second output shaft (74) that protrudes into the main housing (12) where it is connected to a gearwheel (82) that meshes with a second gear ring (84) on the adjustment rotor (26); and - a shaft arrangement (90; 190) equipped with a compensating coupling (92, 94, 95; 192) and connecting the differential gear (72) in the second gear casing (70) to the gear mechanism (52) in the first gear casing (50).
Abstract:
Annular swivel joint (300), especially for use in a shaft furnace charging device (10) that is equipped with a cooling system (12) with a stationary and a rotary circuit portion (30, 32). The annular swivel joint (300) comprises an annular fixed part (312) and an annular rotary part (310) and include an annular trough that defines an annular volume, via which the circuits portions (30, 32) communicate. The annular swivel joint (300) is characterized by: a stationary forward connection (302) for receiving cooling fluid from the stationary circuit portion (32); a rotary forward connection (304) for supplying cooling fluid to the rotary circuit portion (30); a rotary return connection (306) for receiving cooling fluid from the rotary circuit portion (30); and a stationary return connection (308) for returning cooling fluid to the stationary circuit portion (32); a partition (320) dividing the annular volume into an annular external cavity (322) and an annular internal cavity (324) so that the forward connections (302, 304) are coupled via one of the external and internal cavities (322 / 324) and the return connections (306, 308) are coupled via the other cavity (324 / 322), so that the internal cavity (324) is at least partially surrounded by the external cavity (322). The cavities (322, 324) are in double leakage-permitting communication between the external and internal cavities through annular first and second clearances (350, 352) provided to allow relative rotation between the fixed and rotary parts (310, 312); and annular flow restrictors (360, 362) provided in the first and second clearances (350, 352) respectively to reduce leakage between the cavities (322, 324).
Abstract:
A device (10) for distributing charge material into a shaft furnace comprises a main housing (12), a distribution chute, a suspension rotor (18) and an adjustment rotor (26), which are rotatable about a substantially vertical axis. The chute (32) is suspended to the suspension rotor (18) to rotate therewith for circumferential distribution of charge material and adjustable in orientation through the adjustment rotor (26) for radial distribution of charge material. A differential gear (86) interconnects the suspension rotor (18) and the adjustment rotor (26) and is configured to transmit to the adjustment rotor the same speed of rotation that is imparted to the suspension rotor by a main rotation drive (60) unless an adjustment drive (96) imparts, through the differential gear, a differential rotation to the adjustment rotor. According to the invention, the device includes: a first casing (50) arranged on the main housing (12) and enclosing an angular transmission (52) between a substantially vertical output shaft (54), which protrudes from the first casing (50) into the main housing and is connected to a gearwheel (62) that meshes with a first gear ring (64) on the suspension rotor (18), and a connecting shaft (56), which protrudes from the first casing (50) at an angle, in particular perpendicularly, with respect to the output shaft (54); a second casing (70) arranged on the main housing (12) and enclosing an angular transmission (72) between a substantially vertical output shaft (74), which protrudes from the second casing (70) into the main housing and is connected to a gearwheel (78) that meshes with a second gear ring (80) on the adjustment rotor (26), and a connecting shaft (76(, which protrudes from the second casing (70) at an angle, in particular perpendicularly, with respect to the output shaft (74); a third casing (84) that is spaced apart from the first and second casings (50, 70) and encloses the differential gear (86), the differential gear being connected to a first shaft (88), which is coupled to the connecting shaft (56) of the first casing (50), and to a second shaft (90), which is coupled to the connecting shaft (76) of the second casing (70).
Abstract:
A blast furnace installation comprises a blast furnace (10), a gas cleaning unit and lateral top gas extraction tubes connected between an upper topcone (14) of the blast furnace (10) and the gas cleaning unit. According to an aspect of the present invention, the blast furnace installation further comprises a central gas uptake conduit (22) with an uptake opening (26) arranged in the vicinity of a vertical axis of the blast furnace in an upper portion of the blast furnace (10) for extracting gas from an axial region of the blast furnace (10); and an auxiliary gas cleaning unit (24) connected to the central gas uptake conduit (22) for cleaning gas extracted via the central gas uptake conduit (22).
Abstract:
The present invention proposes a method for feeding hot gas to a shaft furnace, in particular into a blast furnace. The method comprises providing a tuyere stock arrangement comprising a bustle pipe (56) arranged for receiving hot gas form a gas main (58) and a plurality of tuyere stocks (18) for feeding hot gas from said bustle pipe (56) into said shaft furnace, said tuyere stocks (18) being arranged around the circumference of said shaft furnace, each tuyere stock (18)comprising a downleg section (39) for connection to a bustle pipe; a blowpipe (34) for feeding the hot gas to the shaft furnace through a tuyere arranged in an opening in a shell (12) of the shaft furnace; and an elbow (37) arranged between the downleg section (39) and the blowpipe (34). According to an aspect of the invention, a Laval type restriction (40, 40', 40'') is arranged in the tuyere stock (18).
Abstract:
A cooling stave (100) for a metallurgical furnace, in particular for a blast furnace, has a metallic plate body (110) with a front face (112) and a rear face (114), and at least one internal coolant passage (120). A set of heat pipes (130) is associated to the coolant passage in the plate body (110) to improve heat transfer from the front face (112) to the associated coolant passage (120). According to the invention, each heat pipe (130) of the set is arranged within the plate body (110) with its condensation end portion (132) enclosed in metallic material of the plate body (110) contiguous to the associated coolant passage (120). Heat transfer from the condensation end portion (132) to the associated coolant passage (120) occurs through this region of metallic material.
Abstract:
A rotary charging device (10) for a shaft furnace commonly comprises a rotary distribution means (12) for distributing charge material on a charging surface in the shaft furnace. A rotatable structure supports (16) the rotary distribution means and a stationary support (18) rotatably supports the rotatable structure. According to the invention, the charging device (10) is equipped with an inductive coupling device (30) including a stationary inductor (34) fixed to the stationary support and a rotary inductor (36) fixed to the rotatable structure. The stationary inductor (34) and the rotary inductor (36) are separated by a radial gap and configured as rotary transformer for achieving contact-less electric energy transfer from the stationary support (18) to the rotatable structure (16) by means of magnetic coupling trough the radial gap for powering an electric load arranged on the rotatable structure (16) and connected to said rotary inductor (36).
Abstract:
The invention concerns a charging installation for a shaft furnace, in particular for a blast furnace, and especially the lower sealing valve assembly thereof. The installation comprises at least two hoppers (22, 24) acting as lock hoppers for intermediate storage of charge material to be charged into the furnace. The lower sealing valve includes a lower sealing valve housing (100) arranged below the hoppers. The lower sealing valve housing (100) has at least two inlets (104, 106) respectively communicating with one of the hoppers and an outlet (107) for passing charge material into the furnace. Each inlet has a respective associated valve seat (112, 114) providing gas-tight sealing of the hoppers downstream. The lower sealing valve assembly further includes a sealing valve mechanism (140, 146, 150) for sealing the inlets, more specifically for closing the seats in technically gas-tight manner. According to the invention, the sealing valve mechanism (140, 146, 150) comprises a one-sided shutter (140) having a single sealing face (142) that cooperates with both of the at least two valve seats (112, 114), by virtue of the sealing valve mechanism being configured to bring the sealing face (142) of the one-sided shutter (140) into sealing contact in turn with each of the at least two valve seats (112, 114) for sealing the associated inlet (104, 106).
Abstract:
A rotary charging device for a shaft furnace, in particular a blast furnace, is disclosed. The charging device is equipped with a cooling system. The rotary charging device comprises a rotatable support for rotary distribution means as well as a stationary housing for the rotatable support. The cooling system comprises a rotary cooling circuit fixed in rotation with the rotatable support as well as a stationary cooling circuit on the stationary housing. A heat transfer device is provided which includes a stationary heat transfer element configured to be cooled by a cooling fluid flowing through the stationary cooling circuit and which includes a rotary heat transfer element configured to be heated by a separate cooling fluid circulated in the rotary cooling circuit. These heat transfer elements are arranged in facing relationship and have there between a heat transfer region for achieving heat transfer by convection and/or radiation through the heat transfer region without mixing of the separate cooling fluids of the rotary and stationary cooling circuits.
Abstract:
The present invention proposes a charging device (10) for charging a shaft furnace, comprising a rotary distributor (12) and a variable drive (14) for rotating the rotary distributor (12) about an essentially vertical axis of rotation (A). The rotary distributor (12) comprises a plurality of guiding members (40, 42, 44, 46), which form sliding channels for charge material. According to an important aspect of the invention, the rotary distributor (12) comprises a junction slide (50) from which each guiding member (40, 42, 44, 46) issues and which is arranged such that a flow of charge material slides via one specific guiding member (40, 42, 44, 46) in function of the velocity and/or the sense of rotation of said rotary distributor (12).