66results about "Top armourings" patented technology

A loading device for a shaft furnace comprises a chute supported by a suspension rotor (28) in a fixed housing. The rotor (28) is fitted with a cooling circuit, supplied with liquid coolant via a rotating annular joint (44). The latter comprises a fixed ring (60) and a rotating ring (62), and is fitted in an annular leak collecting tank (46) formed by the suspension rotor (28). Fixed ring (60) is supported by the housing (12). Rotating ring (62) is supported entirely by fixed ring (60) via a bearing (64). Selective coupling means (65, 66) connect the rotating ring (62) to the suspension rotor (28) in such a way as to transmit a rotary moment of rotor (28) to rotating ring (62) selectively, while at the same time preventing other forces from rotor (28) being transmitted to rotating ring (62).

A method for operating a blast furnace and a corresponding blast furnace, the method including recovering top gas from the blast furnace, submitting at least a portion of the top gas to a recycling process, and feeding the recycled top gas back into the blast furnace, where the recycling process includes feeding the recovered top gas to a reformer unit, feeding volatile carbon containing material to the reformer unit, proceeding to flash gasification of the volatile carbon containing material in the reformer unit, at a temperature between 1100 and 1300° C., and thereby producing devolatised carbonaceous material and synthesis, and allowing the devolatised carbonaceous material and synthesis gas to react with the recovered top gas.

The chill-pressing titanium block to protect blast furnace comprises: 90~98% titanium powder, 2~10wt% composite adhesive composed of cement, polyvinyl alcohol and phosphodiester by proportion as 4~8:1~5:0~1; wherein, cement: cellulose is 5~10:1~5,epoxy resin:sodium humate is 8~10í†0~2, waste molasses liquid:lime hydrate is 7~10í†0~3, and waterglass:bentonite:silicasol is 7~10í†0~2í†0~1. The preparation method comprises: mixing material with adhesive, rolling, covering tightly the material, pressing to form; screening the crude block to re-press the powder less than 10mmm and form product. Compared with prior art, this invention increases mechanical strength, and reduces greatly the powder rate when screening powder.

A three hopper charging installation for a shaft furnace includes a rotary distribution device for distributing bulk material in the furnace by rotating a distribution member about the furnace central axis and a first, a second and a third hopper arranged in parallel above the rotary distribution device and offset from the central axis. A sealing valve housing is arranged between the hoppers and the distribution device. It has a top part with a first, a second and a third inlet respectively communicating with the first, the second and the third hopper. A first, a second and a third sealing valve are provided in the top part. Each sealing valve includes a flap which is pivotable between a closed sealing position and an open parking position. The sealing valve housing also has a funnel shaped bottom part with an outlet communicating with the distribution device. According to the invention, the top part of the sealing valve housing has a tripartite stellate configuration in horizontal section with a central portion, in which the inlets are arranged adjacently in triangular relationship about the central axis, and with a first, a second and a third extension portion, each sealing valve being adapted such that its flap opens outwardly with respect to the central axis by pivoting into a parking position located in the first, second or third extension portion respectively.

In order to configure a bell and hopper for shaft furnaces, in particular, blast furnaces, comprising a charging bin with a feed tube, a rotating chute carrier with rotary drive, a swiveling chute in the interior of the furnace with drive means arranged external to a housing, in a less failure-prone and a wear resistant way, the drive means for the swivel movement of the chute are to comprise: at least one motor (7) which drives by a respective pinion (8) a crown gear (9), wherein the crown gear (9) engages the spindle gear wheels (11) of at least two spindles (13) distributed about the periphery of the bell and hopper external to the rotating chute carrier (3) for generating a lifting and lowering movement of the spindles, as well as means (14, 15, 17, 21) for transmitting this vertical movement of the spindles onto the tilting shafts (22), which penetrate the inner wall (24) of the chute carrier (3) and from which the chute can be suspended, for generating a swivel and tilting movement of the chute.

A system for producing molten iron from iron ores, including a direct reduction shaft furnace, a melting zone in a melting furnace having a coke bed in its lower portion and a charging and preheating chamber in its upper portion, and at least one reducing gas generation zone in communication with said melting zone.

An integrated and sustainable process is presented for the co-generation of pig iron and electric energy in a blast furnace installation in which dried wood replaces charcoal as the fuel, as the reducing and as the carburizing agent. Furthermore, this application incorporates the process—until now independent—of transforming wood into coal, inside the blast furnace.

An apparatus for observing the interior of a blast furnace system includes a visible light guiding unit which defines a light path along a viewing axis that is radial to an upright axis of a furnace wall body of a blast furnace and which is adapted to be secured to a furnace blowpipe to permit the light path to be in visual communication with a tuyere, a beam splitter which is disposed in an accommodation space in the tubular mount to split a beam of light propagating along the light path into a horizontal component so that the operator can observe furnace condition through a peeping hole, and a vertical component, and a video camera system which includes an elongate casing connected to the tubular mount, and a video camera disposed in a cooling chamber of the casing to capture a light image from the vertical component of the light beam.

An improved blast furnace system for producing molten iron incorporating a preheater to heat the cold blast air used to temper the hot blast temperature is disclosed. The improved blast furnace system comprises a blast furnace, a hot blast main for conveying a supply of hot blast to the blast furnace, a plurality of stoves for heating a supply of cold blast and generating the hot blast, a cold blast main for conveying a supply of cold blast to the plurality of stoves, and at least one cold blast preheater for heating a portion of the cold blast, that has been diverted to the preheater, into heated air and the heated air is mixed with the hot blast to temper the hot blast temperature.

A blast furnace head (11) including a material loading device comprising rotary chute (14) driven in rotation about a first, vertical axis of rotation (16), and a loading chute (15) at the outlet of same, driven in rotation about a second, vertical axis of rotation (17) laterally offset relative to the first axis of rotation (16). The gears (20, 21) assigned to both of the chutes (14, 15) are arranged within a sealing chamber (22). Within this sealing chamber (22), a means (28) is arranged for supplying integrated measuring devices (29 or 30), lubrication points or similar maintenance recipients, with these supply means (28) being drivable by one of the gears (20, 21) assigned to the two chutes, in particular by the gear (20) assigned to the rotary chute (14).

The present invention provides a combination reforming/reducing shaft furnace for the production of direct reduced iron that utilizes one or more burden uniformity enhancers, such as one or more rotating/reciprocating mixing shafts, one or more stationary flow aids, one or more wall structures/variations, one or more agitators, or the like for ensuring that reforming and reducing in the shaft furnace take place evenly across the width of and throughout the depth of the burden in the shaft furnace.

A method for manufacturing a low-oxygen copper wire is provided, in which a dehydrogenating treatment can be performed without requiring a long moving distance of molten copper, and the generation of holes in solidification is suppressed, whereby high quality low-oxygen copper wire can be obtained having superior surface quality. The method for continuously manufacturing ingots of low-oxygen copper from molten copper includes a step of performing combustion in a reducing atmosphere in a melting furnace so as to produce molten copper; a step of sealing the molten copper in a non-oxidizing atmosphere in a casting trough; a step of transferring the molten copper to a turn-dish by using the casting trough; a degassing step of passing the molten copper through a degasser provided in the casting trough so as to dehydrogenate the molten copper; a step of continuously feeding the molten copper to a continuous casting machine so as to continuously produce cast copper; and a step of cutting the cast copper into a predetermined length.

The invention relates to a method for operating a shaft furnace (10). According to said method, an upper region (14) of the shaft furnace (10) is charged with raw materials which sink in the shaft furnace (10) under the influence of gravity. Part of the raw materials is melted and/or at least partially reduced by the action of the atmosphere inside the shaft furnace (10). A treatment gas is introduced in a lower region (18) of the shaft furnace (10) by means of at least one lower admission opening (32), said treatment gas at least partially influencing the atmosphere inside the shaft furnace (10). The introduction of the lower treatment gas is dynamically modulated such that, during the modulation, the operating variables, that is pressure p₁ and/or volume flow (I), are varied at least temporarily over a time span of ≦40 s, especially ≦20 s, preferably ≦5 s and especially preferably ≦1 s. According to the invention, an addition gas is introduced via at least one addition opening (42) at a distance from the lower admission opening (32), the operating variables of the gas, that is pressure p₂ and/or volume flow (II), being at least temporarily varied, and/or a shaft furnace gas is derived by means of a shaft furnace gas line (50) connected to the inside (34) of the shaft furnace (10), for removing gaseous reaction products, the operating variables of the shaft furnace gas, that is pressure p₃ and/or volume flow (III), being at least temporarily varied. The variation of the operating variables of the addition gas and/or the shaft furnace gas is carried out according to the invention in such a way that the pressure p₁ and/or the volume flow (I) inside (34) the shaft furnace (10) is at least partially increased.

It has been reported in the literature that raceway measurement made during the decreasing gas velocity is relevant to operating blast furnaces. However, no raceway correlation is available either for decreasing or increasing gas velocity which is developed based on a systematic study and none of the available correlation take care of frictional properties of the material. Therefore, a systematic experimental study has been carried out on raceway hysteresis. Based on experimental data and using dimensional analysis, two raceway correlations, one each for increasing and decreasing gas velocity, have been developed. Also, in the present study the effect of stresses has been considered along with pressure and bed weight terms mathematically. These three forces are expressed in mathematical form and solved analytically for one-dimensional case, using a force balance approach. Based on the force balance approach a general equation has been obtained to predict the size of the cavity in each case, i.e., for increasing and decreasing velocity. Results of these correlations and model have been compared with the data obtained from literature on cold and hot models and plant data along with some experimental data. An excellent agreement has been found between the predicted (using correlations and model) and experimental values. The proposed theory is applicable to any packed bed systems. It has been shown that hysteresis mechanism in the packed beds can be described reasonably taking into consideration the reversal of sign in frictional forces in increasing and decreasing velocity cases.