CN206469679U - One kind exempts from drying direct-reduction rotary hearth furnace - Google Patents

Abstract

Exempt from drying direct-reduction rotary hearth furnace the utility model discloses one kind, cloth is carried out using the chute feeder being arranged on cooling zone and cloth area, and set stomata quickly to cool down metallized pellet in the cooling gas purge passage and chute set by inclination, segment design and in cooling zone, extend the cloth time of green-ball, make full use of the heat of rotary hearth furnace cooling zone metallized pellet and radiant tube, green-ball is further dried, so that the moisture reduction of green-ball, the explosion of pelletizing is avoided, while the effect of preheated pellets can also be reached.Drying direct-reduction rotary hearth furnace is exempted from using the utility model, green pellets need not individually pass through drying device and the furnace roof in rotary hearth furnace cooling zone need not design water-cooling wall, i.e. achievable green-ball is directly distributed into rotary hearth furnace and is reduced directly, thermal state metal pellet is cooled down simultaneously and its heat is comprehensively utilized, improve the efficiency of utilization of rotary hearth furnace, equipment investment and floor space are reduced, production cost is reduce further.

Description

One kind exempts from drying direct-reduction rotary hearth furnace

Technical field

The utility model is related to a kind of rotary hearth furnace, more particularly to one kind exempts from drying direct-reduction rotary hearth furnace, belongs to rotary hearth furnace Apparatus field.

Background technology

Pelletizing or pressure ball-drying-direct-reduction flow being used rotary hearth furnace direct-reduction technique, pelletizing or pressure ball pelletizing are needed more Rotary hearth furnace can be just distributed into after drying, therefore drying plant must be separately provided and is dried；In addition, be reduced directly through rotary hearth furnace Metallized pellet, also needs to discharge outside rotary hearth furnace after supercooling, and the water-cooling wall by being arranged on rotary hearth furnace cooling section Cooled down, this also result in the waste of metallized pellet heat.

Publication No. CN1235268A Chinese utility model patent has opened a kind of for rotary table, especially turns bottom The charging of stove and distribution device；The device includes material feed mechanism (2,3), and material transfer mechanism (304) and material gravity incline Guide groove (4)；The said equipment includes the staticizer of the distribution material for difference, and the mechanism includes toppling over guide groove (4) Cloth leading edge (214), it has profile of substantially curve, and the derivative of the curve is rotary table (10) in workbench The incremental linear function of the radius of part between center and its edge.Topple over guide groove (4) approximately radial with respect to panoramic table (10) Ground is set, and is arranged on one and is nearly parallel in the plane of the plane of the rotary table (10), and with a hopper (5) act together, the outlet edge (205) of the hopper is set close to the surface of workbench, and with toppling over guide groove (4) The substantially similar curved profile of cloth leading edge (214).Guide groove (4) is toppled over by being fixed on the base portion (204) of the guide groove (4) Multiple next doors (114) are separated into multiple passages (104), and guide groove (5) separates multiple passages (105), passage by multiple next doors (115) With the section as the material mouth of the passage (104) of guide groove (4).Feed equipment (103) includes that for manipulation guide groove will be toppled over (4) be separated into the mechanism in the next door (114) of passage (104), the next door can relatively described guide groove (4) base portion (204) it is mobile.Meanwhile, feeding adjusting device includes dynamic mechanism (103), for toppling over the whole cross section of guide groove (4) Differential type feed is carried out, the device is arranged between guide groove (4) and feed arrangement (2,3).Dynamic difference feeding device includes Multiple gates (113), these gates have appropriate separate operation device (123) and are configured to controllable by leading The entrance for each passage (104) that groove is separated into.These gates are all arranged on a top for toppling over guide groove (4) and formed Chute (203) in.Apparatus above is arranged on a support frame (1) by suitable hitch (101), the device institute The major defect of presence is as follows：

(1) have the disadvantage not handling not for the charging of rotary table, especially rotary hearth furnace and one of distribution device The wet bulb group of drying so that wet bulb group directly enters after stove, produces explosion due to being contacted with high temperature furnace bottom, causes dust to increase pollution Environment；

(2) can not be directly using so that heat recovery technique growth, heat loss as the heat entrained by flue gas in rotary hearth furnace Increase, heat recovery efficiency declines；

(3) stoving process adds the scale of technique in pelletizing so that efficiency increases, loss increase.4th has the disadvantage It is single in the way of vibrations as entering to be fed power, require larger for shaking the vibration frequency of equipment.

The Chinese utility model patent of Application No. 201510648755.7 discloses a kind of rotary table and is related to one The cooling being used in the rotary hearth furnace method synchronous with drying is planted, is comprised the following steps that：First, the red ball of rotary hearth furnace is led by first Hopper equably falls on feed end A2 lower floor's carrier bar, while the rotary hearth furnace green-ball is equably fallen by the first distributing device On the feed end B1 upper strata carrier bar；Secondly, by the rotating speed for adjusting the upper strata carrier bar and lower floor's carrier bar, it is ensured that the two Rotation direction is opposite；Then, the red ball that cold air rises and is placed through on lower floor's carrier bar, cools, together to the red ball When air temperature increase transitions into preheated air；Then, the preheated air continues to rise, and is then passed through the life on the upper strata carrier bar Ball, is dried to the green-ball, preheating, while the preheated air temperature declines, is transformed into the hot-air containing certain heat；Most Afterwards, the hot-air is extracted, into falling dust room, then enters the dirt pocket by the falling dust room, and rotary hearth furnace is transferred to by the dirt pocket In air preheating system in use, the major defect present in the system is as follows：

(1) the red ball of rotary hearth furnace could carry out cooling treatment after must being discharged through the first deflector chute outside rotary hearth furnace, not only in row Go out process and cause thermal losses, also need to be separately provided cooling device and cooled down, therefore also need extra land occupation；

(2) cooled down using cold air, easily cause the oxidation of the red ball of rotary hearth furnace, so as to be unfavorable for improving iron product Grade, reduces product quality；

(3) preheated air that the red ball of cooling rotary hearth furnace is produced, continues directly to carry out the green-ball on the carrier bar of upper strata after rising Drying, preheating, because preheated air temperature is higher, easily cause the explosion of green-ball, so as to be unfavorable for the progress of sequential reduction reaction.

The Chinese utility model patent of Application No. 201510649237.7 discloses a kind of for cooling, baking in rotary hearth furnace Synchronous high-performance device is done, it includes：Bearing block, clutch shaft bearing, second bearing, upper network chain/carrier bar, lower network chain/carrier bar, exhausting Machine, casing, upper dividing wall, middle dividing wall, lower dividing wall, maintenance door, bellows, striker plate, support frame, reductor and driving electricity Machine；The two ends of the upper link plate are respectively mounted and connect the clutch shaft bearing, and the lower carrier bar is respectively mounted and connects the second bearing, and And the clutch shaft bearing and second bearing is in overlying relation is fixedly arranged on the bearing block；The casing is placed on the support frame On, the maintenance door is opened up on the casing, and the maintenance door is placed on the support frame, the bellows are located on the casing, and this is taken out Blower fan is located above the bellows；In the casing internal, dividing wall is located on the upper link plate on this；Dividing wall is located on this in this Between network chain/carrier bar and the lower carrier bar；The lower dividing wall is located at the lower section of the lower carrier bar.

In a word, in current rotary hearth furnace process, different set is respectively adopted in the drying of green-ball and the cooling of metallized pellet Standby and technique is handled, and takes up an area face greatly, technological process is long, and efficiency of utilization is low, this not only construction cost increase, can also be caused The problems such as energy consumption index is higher, production cost is higher, has much room for improvement.

Utility model content

The utility model is mainly solving the technical problems that existing rotary hearth furnace flow, and green-ball must could cloth after individually drying Enter rotary hearth furnace and carry out needing to set on reduction roasting and rotary hearth furnace cooling zone technological process length caused by water-cooling wall, equipment investment Greatly, floor space is big and metallized pellet heat can not be utilized, and thermal loss is big, the problems such as high energy consumption；

Technical problem to be solved in the utility model is achieved through the following technical solutions：

One kind exempts from drying direct-reduction rotary hearth furnace, including annular body of heater and rotatable ring-shaped furnace bottom, the annular body of heater by Inner circumferential furnace wall, periphery furnace wall and annular furnace roof composition, inner circumferential furnace wall are coaxially disposed with periphery furnace wall, the inside and outside side of annular furnace roof The top of inner circumferential furnace wall and periphery furnace wall is connected to, annular furnace is formed, described ring-shaped furnace bottom is correspondingly arranged at the annular The lower section of burner hearth；Cloth area, preheating zone, middle warm area, high-temperature region and cooling zone are circumferentially disposed with the annular furnace, And cooling zone and cloth area are adjacent, separated between cloth area and preheating zone, between high-temperature region and cooling zone with the barricade of radial direction, Left between the lower end of the barricade and ring-shaped furnace bottom can at least through one layer of material interval；The preheating zone, middle warm area and Burner is housed on the internal and external circumferential furnace wall of high-temperature region, spiral discharging device is provided between the furnace bottom in cooling zone and cloth area, in chute Close to the internal and external circumferential furnace wall of ring-shaped furnace bottom provided with cooling gas between rotary hearth furnace cooling zone and spiral discharging device below distributing device Body purge passage；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust chimney；Between the cloth area and cooling zone Furnace bottom is provided with channel distributor and channel distributor cross section two ends are located between partition wall；Stove above the channel distributor Top is provided with material inlet corresponding to the side of cooling zone；Multiple radiant tubes are set between channel distributor.

The channel distributor is slipped including first paragraph gravity chute, second segment gravity chute and the 3rd section of tilting Groove, three sections of gravity chute head and the tail are sequentially connected and alternateed in circumferencial direction and staggered, and three sections of gravity chutes pass through two Fixed-link device is connected and fixed to together, and the upper end of fixed-link device is connected with the vibra feeder positioned at furnace roof；Make For preferred structure, one of vibra feeder is located near material inlet；Three sections of gravity chutes are in sector, and it two The radian at end is consistent with the radian on rotary hearth furnace circumferencial direction, and its cross section is parallel with rotary hearth furnace radial direction；First paragraph is tilted Formula chute, second segment gravity chute and each two dividing plates of freedom of the 3rd section of gravity chute and the chute being trapped among in dividing plate Runway is constituted；Discharge flapper is respectively equipped with the head end of the head end of second segment gravity chute and the 3rd section of gravity chute； The head end of the chute runway of first paragraph gravity chute is located at the underface of material inlet；It is preferred that, material inlet along rotary hearth furnace radially Width it is identical with the overall width of the chute runway of first paragraph gravity chute.

The utility model is to a kind of preferred structure of channel distributor, and the angle of first paragraph gravity chute and level is 5~10 °, the angle of second segment gravity chute and level is 8~13 °, and the angle of the 3rd section of gravity chute and level is 10 ~15 °；The center of three sections of gravity chutes is on spiral discharging device, and the tail end of the 3rd section of gravity chute is located at cloth area Surface, and the perigee distance rotary furnace bottom of the 3rd section of gravity chute tail end is highly 40~80mm.Thus, it can be ensured that Channel distributor can pelletizing is uniform, smoothly cloth is to rotary furnace bottom, and farthest reduces pelletizing in falling process In fragmentation phenomenon.

Further improvement of the utility model to channel distributor, sets multiple radiation between three sections of gravity chutes Pipe, the radiant tube set between three sections of gravity chutes is evenly arranged along rotary hearth furnace radial direction, and is traversed in internal and external circumferential stove Between wall；Wherein, between first paragraph gravity chute and second segment gravity chute and in second segment gravity chute and Between 3rd section of gravity chute multiple radiant tubes are uniformly arranged along rotary hearth furnace radial direction；The radiation temperature of the radiant tube is 200~600 DEG C to realize preheating and drying to green pellets in top, lower section chute；It is furthermore preferred that first paragraph tilt chute and The radiation temperature that second segment tilts the radiant tube between chute is 200~300 DEG C, and second segment tilts chute and the 3rd section of inclination is slipped The radiation temperature of radiant tube between groove is 400~500 DEG C.Thus, radiant tube green pellets can be further dried and in advance Heat, and being gradually risen as radiant tube radiation temperature is top-down, green pellets first through low temperature, middle temperature, then through high temperature drying and Preheating, can so effectively improve the drying of pelletizing and the pre- thermal efficiency, while farthest reducing the explosion of pelletizing.

The height of the dividing plate is 80~100mm, while its height is higher by least 40mm than the bed of material；The chute runway Stomata is distributed with bottom even；It is preferred that, the stomata is circular stomata, it is furthermore preferred that the circular stomata be a diameter of 5~ 7mm circular stomata.Thus, qualified pelletizing can be uniformly on cloth to channel distributor, and can ensure blowing gas and heat Smoothly motion upwards.

The utility model to channel distributor further preferably, the channel distributor is in circumferencial direction away from turning bottom The distance of stove both sides furnace wall is 50~100mm.

The cooling gas purge passage injection coal gas, coke-stove gas or blast furnace gas.Due to coal gas, coke-stove gas It is the reducibility gas containing carbon monoxide with blast furnace gas etc., therefore passes through cooling gas purge passage and is blown above-mentioned gas Body, can not only prevent the oxidation of metallized pellet, and also metallized pellet further can be reduced.Thus, realizing While cooling down metallized pellet, also the degree of metalization of metallized pellet can be improved 1%~3%.

It is of the present utility model exempt from drying direct-reduction rotary hearth furnace green pellets operation principle be：By in vibra feeder The batcher set outside upper, rotary hearth furnace is fed, and is slowly moved down via chute, is reached chute end and is passed through discharge flapper To chute, then after slowly being moved down via chute, chute end is reached by discharge flapper to chute, finally via slipping Groove even feeding to the cloth area of rotary furnace bottom completes cloth.Pass through cooling gas purge passage purge gas so that cooling Thermal state metal pellet is further reduced and quickly cooled down, the effect that the heat that cooling gas is taken away passes through barricade, barricade in area Motion, and pass to green pellets by the circular stomata set on chute upwards, radiant tube is by using gas fuel burning The heat of generation is also radiated to green pellets, and green pellets is preheated and dried jointly, further reduction pelletizing moisture, raising ball Group's preheating temperature, drying and pre- thermogenetic flue gas and vapor are then discharged by exhaust chimney.Green pellets is by preliminary preheating After drying, then the feed zone of rotary hearth furnace is distributed into, then sequentially passes through preheating zone, middle warm area, high-temperature region and cooling zone, pelletizing is straight Connecing in reduction process will not occur substantially to burst and complete direct reduction reactor, then through discharging outside spiral discharge rotary hearth furnace, obtain Metallized pellet after cooling.

The utility model carries out cloth using the chute feeder being arranged on cooling zone and cloth area, and by inclining Tiltedly, stomata is set quickly to cool down metallization ball in segment design and the cooling gas purge passage and chute that are set in cooling zone Group, extends the cloth time of green-ball, makes full use of the heat of rotary hearth furnace cooling zone metallized pellet and radiant tube, further do Dry green-ball so that the moisture reduction of green-ball, it is to avoid the explosion of pelletizing, while the effect of preheated pellets can also be reached.Using this reality With Novel free drying direct-reduction rotary hearth furnace, green pellets without individually by drying device and rotary hearth furnace cooling zone furnace roof without Water-cooling wall need to be designed, you can realize that green-ball is directly distributed into rotary hearth furnace and is reduced directly, while thermal state metal pellet obtains cold But and its heat is comprehensively utilized, the efficiency of utilization of rotary hearth furnace is improved, equipment investment and floor space is reduced, enters one Step reduces production cost.

Major advantage of the present utility model includes：

1) problem that green-ball directly enters stove is solved, the technological process of rotary hearth furnace is shortened, equipment investment is reduced and accounts for Ground area, improves production efficiency, reduces production cost；

2) heat of rotary hearth furnace cooling zone metallized pellet is made full use of, the purpose of drying and preheated pellets is reached, enters one Step improves rotary hearth furnace efficiency of utilization, reduces energy consumption；

3) the utility model can be prevented effectively from green-ball in drying and the Decrepitation Phenomena of roasting process, and setting by radiant tube Improve pelletizing with being set effective dry and the pre- thermal efficiency, so as to ultimately facilitate the progress of reduction roasting reaction；

4) coal gas, coke-stove gas and blast furnace gas for being blown in the utility model by cooling gas purge passage etc. are For reducibility gas, this can not only prevent the oxidation of metallized pellet, can also further improve its degree of metalization.Thus, exist While realizing cooling metallized pellet, also the degree of metalization of metallized pellet can be improved 1%~3%.

Brief description of the drawings

One kind that Fig. 1 the utility model is provided exempts from drying direct-reduction rotary hearth furnace inside top figure；

Fig. 2 the utility model exempts from the chute structure top view of drying direct-reduction rotary hearth furnace；

Fig. 3 chute cross-sectional profile schematic diagrames；

Fig. 4 channel distributors are in rotary hearth furnace circumferencial direction structural representation；

Description of reference numerals：1st, cloth area；2nd, preheating zone；3rd, middle warm area；4th, high-temperature region；5th, cooling zone；6th, dividing plate；7th, it is cold But gas purge passage；8th, stomata；9th, discharge flapper；10th, spiral discharging device；11st, chute runway；12nd, chute 1；13rd, chute 2； 14th, chute 3；15th, vibra feeder；16th, fixed-link device；17th, radiant tube；18th, barricade；19th, exhaust chimney；20th, it is fed Mouthful.

Embodiment

With reference to Fig. 1, the utility model exempts from drying direct-reduction rotary hearth furnace there is provided one kind, including annular body of heater and rotatable Ring-shaped furnace bottom, the annular body of heater is made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, and inner circumferential furnace wall and periphery furnace wall are coaxial Set, the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, form annular furnace, it is described Ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Cloth area 1, preheating zone are circumferentially disposed with the annular furnace 2nd, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, between cloth area 1 and preheating zone 2, high-temperature region Separated between 4 and cooling zone 5 with the barricade 18 of radial direction, leave and can at least lead between the lower end of the barricade 18 and ring-shaped furnace bottom Cross the interval of one layer of material；Burner is housed on the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4, in cooling zone Spiral discharging device 10 is provided between 5 and the furnace bottom in cloth area 1, rotary hearth furnace cooling zone 5 and spiral below channel distributor go out Between glassware 10 cooling gas purge passage 7 is provided with close to the internal and external circumferential furnace wall of ring-shaped furnace bottom；Above channel distributor Rotary hearth furnace furnace roof is provided with exhaust chimney 19；Wherein, channel distributor is provided with the furnace bottom between the cloth area 1 and cooling zone 5, And channel distributor cross section two ends are located between partition wall 18a, 18b；Furnace roof above the channel distributor corresponds to cooling The side in area 5 is provided with material inlet 20；Multiple radiant tubes 17 are set between channel distributor.

The injection of cooling gas purge passage 7 coal gas, coke-stove gas or blast furnace gas.

The channel distributor is 50~100mm in distance of the circumferencial direction away from rotary hearth furnace both sides furnace wall.

With reference to Fig. 2-Fig. 3, the channel distributor includes first paragraph gravity chute 12, the and of second segment gravity chute 13 3rd section of gravity chute 14, three sections of head and the tail of gravity chute 12,13,14 are sequentially connected and alternate mistake in circumferencial direction Open, three sections of gravity chutes 12,13,14 are connected and fixed to together by two fixed-link devices 16, fixed-link device 16 upper end is connected with the vibra feeder 15 positioned at furnace roof；It is preferred that, one of vibra feeder 15 is located at material inlet 20 Near；Three sections of gravity chutes 12,13,14 are in sector, and the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, Its cross section is parallel with rotary hearth furnace radial direction；First paragraph gravity chute 12, second segment gravity chute 13 and the 3rd section Two dividing plates 6 of each freedom of gravity chute 14 and chute runway 11a, 11b, 11c composition being trapped among in dividing plate；Incline in second segment The head end of the head end of inclined chute 13 and the 3rd section of gravity chute 14 is respectively equipped with discharge flapper 9a, 9b；First paragraph is tilted The chute runway 11a of formula chute 12 head end is located at the underface of material inlet 20；As preferred structure, material inlet 20 is along rotary hearth furnace The width of radial direction is identical with the chute runway 11a of first paragraph gravity chute 12 width；First paragraph gravity chute 12 and water Flat angle is 5~10 °, and the angle of second segment gravity chute 13 and level is 8~13 °, the 3rd section of He of gravity chute 14 The angle of level is 10~15 °；The center of three sections of gravity chutes 12,13,14 is on spiral discharging device 10, the 3rd section of inclination The tail end of formula chute 13 is located at the surface in cloth area 1, and the perigee distance rotary hearth furnace of the 3rd section of tail end of gravity chute 14 Furnace bottom is highly 40~80mm.

The height of the dividing plate 6 is 80~100mm, while its height is higher by least 40mm than the bed of material；The chute runway Stomata 8 is distributed with 11a, 11b, 11c bottom even；As a kind of preferred structure, the stomata 8 is circular stomata, more It is preferred that, the circular stomata is a diameter of 5~7mm circular stomata.

As a kind of preferred structure of the present utility model, in first paragraph gravity chute 12 and second segment gravity chute Uniformly set along rotary hearth furnace radial direction between 13 and between second segment gravity chute 13 and the 3rd section of gravity chute 14 Put multiple radiant tubes 17；The radiation temperature of the radiant tube 17 is 200~600 DEG C, it is preferred that first paragraph tilts chute 12 and the The radiation temperature of radiant tube 17 between two sections of inclination chutes 13 is 200~300 DEG C, and second segment tilts chute 13 and the 3rd section is inclined The radiation temperature of radiant tube 17 between inclined chute 14 is 400~500 DEG C.

The operation principle that the utility model exempts from drying direct-reduction rotary hearth furnace is as follows：Green pellets passes through in vibra feeder 15 The batcher set outside upper, rotary hearth furnace is fed, and is slowly moved down via chute 12, is reached chute end and is kept off by blanking Plate 9a is given to chute 13, then after slowly being moved down via chute 13, reaches chute end by discharge flapper 9b to chute 14, finally complete cloth via the cloth area 1 of the even feeding of chute 14 to rotary furnace bottom；Pass through cooling gas purge passage 7 Purge gas so that thermal state metal pellet is further reduced and quickly cooled down in cooling zone 5, the heat that cooling gas is taken away leads to The effect for crossing barricade 18 is moved upwards, and passes to green pellets by the circular stomata 8 set on chute 12,13,14, radiation The heat that pipe 17 is produced by using gas fuel burning is also radiated to green pellets, and green pellets is preheated and dried jointly, Further reduction pelletizing moisture, raising pelletizing preheating temperature, dry and pre- thermogenetic flue gas and vapor are then by being vented cigarette Chimney 19 is discharged.Green pellets is after preliminary preheating and drying, then is distributed into the cloth area 1 of rotary hearth furnace, then sequentially pass through preheating zone 2, Middle warm area 3, high-temperature region 4 and cooling zone 5, green pellets will not occur substantially to burst and complete direct-reduction in Direct Reduction Reaction, then discharged through screw processor 10 outside rotary hearth furnace, the metallized pellet after being cooled down.Thus, green pellets is without individually By drying device, and furnace roof in rotary hearth furnace cooling zone need not design water-cooling wall, you can realize that green-ball is directly distributed into rotary hearth furnace It is reduced directly, while thermal state metal pellet is cooled down and its heat is comprehensively utilized, improves the heat of rotary hearth furnace Utilization ratio, reduces equipment investment and floor space, further reduces production cost.

Case is embodied

Embodiment 1

With reference to Fig. 1-4, one kind provided by the utility model is exempted from drying direct-reduction rotary hearth furnace and used in rotary hearth furnace The rotary hearth furnace of chute feeder, furnace roof, the side of vibra feeder 15 in the top of rotary hearth furnace cooling zone 5 are provided with material inlet 20, give Width of the material mouth 20 along rotary hearth furnace radial direction is identical with the width of chute 12；Rotary hearth furnace furnace roof in the top of chute 12 is provided with exhaust cigarette Chimney 19, barricade 18 is provided with the cross section two ends of chute 12,13,14；Rotary hearth furnace cooling zone both sides below chute 14 are provided with cold But gas purge passage 7 is used to be blown coal gas；The wing furnace of rotary hearth furnace two in rotary hearth furnace preheating zone 2, middle warm area 3 and high-temperature region 4 Wall is provided with burner, for the burning of various fuel, to provide heat for rotary hearth furnace reduction process；Set in the middle of channel distributor There is radiant tube 17, for being further dried and preheating to pelletizing.

Wherein, channel distributor is arranged on the cooling zone 5 and cloth area 1 in rotary hearth furnace, including three sections have with horizontal plane Join end to end, and filled by fixed-link between the gravity chute 12,13,14 and radiant tube 17, and three sections of chutes of certain angle Put 16 to be fixed, vibrating feed is carried out by vibra feeder 15.

Wherein, the radiation temperature of the radiant tube 17 between chute 1 and chute 2 is 200~300 DEG C, positioned at the He of chute 2 The radiation temperature of radiant tube 17 between chute 3 is 400~500 DEG C.

Wherein, chute 1 and horizontal sextant angle are 5 °, and chute 2 and horizontal sextant angle are 8 °, and chute 3 and horizontal sextant angle are 10 °, and The center of chute 3 is on spiral discharging device 10, the least significant end of chute 3 apart from rotary furnace bottom is highly 40mm, and chute is centrally located at Discharge directly over spiral 10, and with its keeping parallelism.

Wherein, channel distributor is in circumferencial direction and rotary hearth furnace side wall 50~100mm, and chute is interior by twice dividing plate apart 6 are averagely divided into three chute runways 11, and chute is consistent with the radian on rotary hearth furnace circumferencial direction, chute cross section is with turning bottom Stove radial direction is parallel；The height of the chute internal partition 6 is 80~100mm, while its height is higher by 40mm than bed depth； The bottom even of chute, which is distributed with below a diameter of 5mm circular stomata 8, each chute, a discharge flapper 9, and three Chute and rotary hearth furnace junction are provided with vibra feeder 15 so that pelletizing even feeding, avoid putty.

Green pellets is fed by the material inlet 20 set in rotary hearth furnace furnace roof, via the chute runway 11a of chute 12 Slowly move down, reach chute end and delayed by discharge flapper 9a to chute 13, then via the chute runway 11b of chute 13 Slowly chute end is reached after moving down by discharge flapper 9b to chute 14, finally via the chute runway 11c of chute 14 Even feeding to the cloth area 1 of rotary furnace bottom completes cloth.Coal gas is purged by cooling gas purge passage 7 so that cold But thermal state metal pellet is quickly cooled down in area 5, while preventing metallized pellet from aoxidizing, and can also be improved its degree of metalization 1% so that thermal state metal pellet is further reduced and quickly cooled down in cooling zone 5, the heat that cooling gas is taken away passes through gear Wall 18, the effect of barricade 18 are moved upwards, and pass to green pellets by the circular stomata 8 set on chute 12,13,14, The heat that radiant tube 17 is produced by using coal gas burning is also radiated to green pellets, and green pellets is preheated and done jointly Dry, further reduction pelletizing moisture, raising pelletizing preheating temperature, dry and pre- thermogenetic flue gas and vapor then pass through exhaust Chimney 19 is discharged.Green pellets is after preliminary preheating and drying, then is distributed into the cloth area 1 of rotary hearth furnace, then sequentially passes through preheating zone 2nd, middle warm area 3, high-temperature region 4 and cooling zone 5, pelletizing will not occur substantially to burst and complete direct-reduction in Direct Reduction Reaction, then discharged through spiral discharging device 10 outside rotary hearth furnace, the metallized pellet after being cooled down.

Thus, green pellets need not design water-cooling wall without the furnace roof individually by drying device, and in rotary hearth furnace cooling zone, I.e. achievable green-ball is directly distributed into rotary hearth furnace and is reduced directly, while thermal state metal pellet is cooled down and its heat is obtained Comprehensive utilization, improves the efficiency of utilization of rotary hearth furnace, reduces equipment investment and floor space, and further reduction is produced into This.

Embodiment 2

With reference to Fig. 1-4, one kind provided by the utility model is exempted from drying direct-reduction rotary hearth furnace and used in rotary hearth furnace The rotary hearth furnace of chute feeder, furnace roof, the side of vibra feeder 15 in the top of rotary hearth furnace cooling zone 5 are provided with material inlet 20, give Width of the material mouth 20 along rotary hearth furnace radial direction is identical with the width of chute 12；Rotary hearth furnace furnace roof in the top of chute 12 is provided with exhaust cigarette Chimney 19, barricade 18 is provided with the cross section two ends of chute 12,13,14, and the rotary hearth furnace cooling zone both sides below chute 14 are provided with cold But gas purge passage 7 is used to be blown blast furnace gas；Rotary hearth furnace both sides in rotary hearth furnace preheating zone 2, middle warm area 3 and high-temperature region 4 Furnace wall is provided with burner, for the burning of various fuel, to provide heat for rotary hearth furnace reduction process；In the middle of channel distributor Provided with radiant tube 17, for being further dried and preheating to pelletizing.

Wherein, the radiation temperature of the radiant tube 17 between chute 1 and chute 2 is 250~350 DEG C, positioned at the He of chute 2 The radiation temperature of radiant tube 17 between chute 3 is 450~550 DEG C.

Wherein, it is divided into chute by twice dividing plate 6 on three feeding chutes, and chute radian and rotary hearth furnace circumferencial direction Radian is consistent, chute cross section is parallel with rotary hearth furnace radial direction, three chute inner bottom parts are evenly distributed with a diameter of 6mm circular stomata 8, each chute end is provided with rotary hearth furnace junction and shaken by rectangle blanking channel, and three chutes Dynamic dispenser 15, may be such that pelletizing even feeding, avoids material spilling hole putty.

Wherein, chute 1 and horizontal sextant angle are 8 °, and chute 2 and horizontal sextant angle are 10 °, and chute 3 and horizontal sextant angle are 12 °, and The center of chute 3 is on spiral discharging device 10, the least significant end of chute 3 apart from rotary furnace bottom is highly 60mm, and chute is centrally located at Discharge directly over spiral 10, and with its keeping parallelism.

Wherein, distributing device is in circumferencial direction and rotary hearth furnace side wall 50~100mm, and chute is interior flat by twice dividing plate 6 apart Three chute runways 11 are divided into, and chute radian is consistent with the radian on rotary hearth furnace circumferencial direction, chute cross section is with turning Bottom stove radial direction is parallel.The height of the chute internal partition 6 is 80~100mm, while its height should be than bed depth at least It is higher by 40mm.The bottom even of chute, which is distributed with below a diameter of 6mm circular stomata 8, each chute, a discharge flapper 9, and three chutes are provided with vibra feeder 15 with rotary hearth furnace junction, may be such that pelletizing even feeding, avoid putty.

Green pellets is fed by the material inlet 20 set in rotary hearth furnace furnace roof, via the chute runway 11a of chute 12 Slowly move down, reach chute end and delayed by discharge flapper 9a to chute 13, then via the chute runway 11b of chute 13 Slowly after moving down, chute end is reached by discharge flapper 9b to chute 14, finally via the chute runway 11c of chute 14 Even feeding to the cloth area 1 of rotary furnace bottom completes cloth.Blast furnace gas is purged by cooling gas purge passage 7 so that Thermal state metal pellet is quickly cooled down in cooling zone 5, while preventing metallized pellet from aoxidizing, and can also be carried its degree of metalization It is high by 2% so that thermal state metal pellet is further reduced and quickly cooled down in cooling zone 5, and the heat that cooling gas is taken away passes through The effect of barricade 18 is moved upwards, and passes to green pellets, radiant tube by the circular stomata 8 set on chute 12,13,14 17 heats produced by using blast furnace gas combustion are also radiated to green pellets, and green pellets is preheated and dried jointly, is entered One step reduction pelletizing moisture, raising pelletizing preheating temperature, drying and pre- thermogenetic flue gas and vapor then pass through exhaust chimney 19 discharges.Green pellets is after preliminary preheating and drying, then is distributed into the cloth area 1 of rotary hearth furnace, then sequentially pass through preheating zone 2, in Direct-reduction will not occur substantially to burst and complete in Direct Reduction for warm area 3, high-temperature region 4 and cooling zone 5, pelletizing instead Should, then discharged through spiral discharging device 10 outside rotary hearth furnace, the metallized pellet after being cooled down.

Thus, green pellets need not design water-cooling wall without the furnace roof individually by drying device, and in rotary hearth furnace cooling zone, I.e. achievable green-ball is directly distributed into rotary hearth furnace and is reduced directly, while thermal state metal pellet is cooled down and its heat is obtained Comprehensive utilization, improves the efficiency of utilization of rotary hearth furnace, reduces equipment investment and floor space, and further reduction is produced into This.

Embodiment 3

With reference to Fig. 1-4, one kind provided by the utility model is exempted from drying direct-reduction rotary hearth furnace and used in rotary hearth furnace The rotary hearth furnace of chute feeder, furnace roof, the side of vibra feeder 15 in the top of rotary hearth furnace cooling zone 5 are provided with material inlet 20, give Width of the material mouth 20 along rotary hearth furnace radial direction is identical with the width of chute 12；Rotary hearth furnace furnace roof in the top of chute 12 is provided with exhaust cigarette Chimney 19, barricade 18 is provided with the cross section two ends of chute 12,13,14；Rotary hearth furnace cooling zone both sides below chute 14 are provided with cold But gas purge passage 7, available for injection coke-stove gas；Rotary hearth furnace two in rotary hearth furnace preheating zone 2, middle warm area 3 and high-temperature region 4 Wing furnace wall is provided with burner, for the burning of various fuel, to provide heat for rotary hearth furnace reduction process；In channel distributor Between be provided with radiant tube 17, for being further dried and preheating to pelletizing.

Wherein, the radiation temperature of the radiant tube 17 between chute 1 and chute 2 is 300~400 DEG C, positioned at the He of chute 2 The radiation temperature of radiant tube 17 between chute 3 is 500~600 DEG C；

Wherein, it is divided into chute by twice dividing plate 6 on three feeding chutes, and chute radian and rotary hearth furnace circumferencial direction Radian is consistent, chute cross section is parallel with rotary hearth furnace radial direction, three chute inner bottom parts are evenly distributed with a diameter of 7mm circular stomata 8, each chute end is provided with rotary hearth furnace junction and shaken by rectangle blanking channel, and three chutes Dynamic dispenser 15, may be such that pelletizing even feeding, avoids material spilling hole putty；

Wherein, chute 1 and horizontal sextant angle are 10 °, and chute 2 and horizontal sextant angle are 13 °, and chute 3 and horizontal sextant angle are 15 °, And the center of chute 3 is on spiral discharging device, the least significant end of chute 3 apart from rotary furnace bottom is highly 80mm, chute is centrally located at Discharge spiral directly over and with its keeping parallelism.

Wherein, distributing device is in circumferencial direction and rotary hearth furnace side wall 50~100mm, and chute is interior flat by twice dividing plate 6 apart Three chute runways 11 are divided into, and chute radian is consistent with the radian on rotary hearth furnace circumferencial direction, chute cross section is with turning Bottom stove radial direction is parallel.The height of the chute internal partition 6 is 80~100mm, while its height should be than bed depth at least It is higher by 40mm.The bottom even of chute, which is distributed with below a diameter of 7mm circular stomata 8, each chute, a discharge flapper 9, and three chutes are provided with vibra feeder 15 with rotary hearth furnace junction, may be such that pelletizing even feeding, avoid putty.

Green pellets is fed by the material inlet 20 set in rotary hearth furnace furnace roof, via the chute runway 11a of chute 12 Slowly move down, reach chute end and delayed by discharge flapper 9a to chute 13, then via the chute runway 11b of chute 13 Slowly after moving down, chute end is reached by discharge flapper 9b to chute 14, finally via the chute runway 11c of chute 14 Even feeding to the cloth area 1 of rotary furnace bottom completes cloth.Coke-stove gas is purged by cooling gas purge passage 7 so that Thermal state metal pellet is quickly cooled down in cooling zone 5, while preventing metallized pellet from aoxidizing, and can also be carried its degree of metalization It is high by 3% so that thermal state metal pellet is further reduced and quickly cooled down in cooling zone 5, and the heat that cooling gas is taken away passes through The effect of barricade 18 is moved upwards, and passes to green pellets, radiant tube by the circular stomata 8 set on chute 12,13,14 17 heats produced by using coke-stove gas burning are also radiated to green pellets, and green pellets is preheated and dried jointly, is entered One step reduction pelletizing moisture, raising pelletizing preheating temperature, drying and pre- thermogenetic flue gas and vapor then pass through exhaust chimney 19 discharges.Green pellets is after preliminary preheating and drying, then is distributed into the cloth area 1 of rotary hearth furnace, then sequentially pass through preheating zone 2, in Direct-reduction will not occur substantially to burst and complete in Direct Reduction for warm area 3, high-temperature region 4 and cooling zone 5, pelletizing instead Should, then discharged through spiral discharging device 10 outside rotary hearth furnace, the metallized pellet after being cooled down.

Thus, green pellets need not design water-cooling wall without the furnace roof individually by drying device, and in rotary hearth furnace cooling zone, I.e. achievable green-ball is directly distributed into rotary hearth furnace and is reduced directly, while thermal state metal pellet is cooled down and its heat is obtained Comprehensive utilization, improves the efficiency of utilization of rotary hearth furnace, reduces equipment investment and floor space, and further reduction is produced into This.

Claims (14)

1. one kind exempts from drying direct-reduction rotary hearth furnace, including annular body of heater and rotatable ring-shaped furnace bottom, the annular body of heater is by interior All furnace walls, periphery furnace wall and annular furnace roof composition, inner circumferential furnace wall are coaxially disposed with periphery furnace wall, the inside and outside side point of annular furnace roof The top of inner circumferential furnace wall and periphery furnace wall is not connected to, annular furnace is formed, and described ring-shaped furnace bottom is correspondingly arranged at the annular furnace The lower section of thorax；Cloth area (1), preheating zone (2), middle warm area (3), high-temperature region are circumferentially disposed with the annular furnace (4) and cooling zone (5), and cooling zone (5) and cloth area (1) are adjacent, between cloth area (1) and preheating zone (2), high-temperature region (4) Separated between cooling zone (5) with the barricade (18) of radial direction, being left between the lower end of the barricade (18) and ring-shaped furnace bottom can At least through the interval of one layer of material；It is equipped with the internal and external circumferential furnace wall of the preheating zone (2), middle warm area (3) and high-temperature region (4) Burner, is provided with spiral discharging device (10) between the furnace bottom of cooling zone (5) and cloth area (1), it is characterised in that：In the cloth area (1) furnace bottom between cooling zone (5) be provided with channel distributor, and channel distributor cross section two ends be located at partition wall (18a, Between 18b)；The side that furnace roof above the channel distributor corresponds to cooling zone (5) is provided with material inlet (20)；In chute cloth Internal and external circumferential furnace wall between rotary hearth furnace cooling zone (5) and spiral discharging device (10) below glassware close to ring-shaped furnace bottom is provided with Cooling gas purge passage (7)；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust chimney (19)；In channel distributor Centre sets multiple radiant tubes (17)；

The channel distributor includes first paragraph gravity chute (12), second segment gravity chute (13) and the 3rd section of tilting Chute (14), three sections of gravity chutes (12,13,14) are sequentially connected and alternateed in circumferencial direction and staggered from beginning to end, and three sections are inclined Inclined chute (12,13,14) is connected and fixed to together by two fixed-link devices (16), fixed-link device (16) Upper end is connected with the vibra feeder (15) positioned at furnace roof.

2. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：One of vibra feeder (15) it is located near material inlet (20).

3. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：Three sections of gravity chutes (12, 13,14) in sector, the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, its cross section and rotary hearth furnace radial direction Direction is parallel.

4. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：First paragraph gravity chute (12), second segment gravity chute (13) and two dividing plates (6) of each freedom of the 3rd section of gravity chute (14) and be trapped among every Chute runway (11a, 11b, 11c) composition in plate；In the head end of second segment gravity chute (13) and the 3rd section of tilting The head end of chute (14) is respectively equipped with discharge flapper (9a, 9b)；The head end of first paragraph gravity chute (12) chute runway (11a) Underface positioned at material inlet (20).

5. according to claim 4 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：Material inlet (20) is along rotary hearth furnace footpath To width it is identical with the overall width of first paragraph gravity chute (12) chute runway (11a).

6. according to claim 4 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：The height of the dividing plate (6) is 80~100mm, while its height is higher by least 40mm than the bed of material；The bottom even of the chute runway (11a, 11b, 11c) point It is furnished with stomata (8).

7. according to claim 6 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：The stomata (8) is circular gas Hole.

8. according to claim 7 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：The circular stomata is a diameter of 5~7mm circular stomata.

9. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：First paragraph gravity chute (12) Angle with level is 5~10 °, and the angle of second segment gravity chute (13) and level is 8~13 °, and the 3rd section of tilting is slipped Groove (14) and the angle of level are 10~15 °；The center of three sections of gravity chutes (12,13,14) spiral discharging device (10) it On, the tail end of the 3rd section of gravity chute (13) is located at the surface of cloth area (1), and the 3rd section of gravity chute (14) tail end Perigee distance rotary furnace bottom highly be 40~80mm.

10. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：Three sections of gravity chutes it Between multiple radiant tubes (17) are set.

11. according to claim 10 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：Three sections of gravity chutes it Between the radiant tube (17) that sets be evenly arranged along rotary hearth furnace radial direction, and traverse between internal and external circumferential furnace wall.

12. according to claim 10 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：In first paragraph gravity chute (12) between second segment gravity chute (13) and in second segment gravity chute (13) and the 3rd section of gravity chute (14) multiple radiant tubes (17) are uniformly arranged along rotary hearth furnace radial direction between；The radiation temperature of the radiant tube (17) is 200 ~600 DEG C.

13. according to claim 12 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：First paragraph tilts chute (12) And it is 200~300 DEG C that second segment, which tilts the radiation temperature of the radiant tube (17) between chute (13), second segment tilts chute (13) The radiation temperature of radiant tube (17) between the 3rd section of inclination chute (14) is 400~500 DEG C.

14. according to claim 1 exempt from drying direct-reduction rotary hearth furnace, it is characterised in that：The cooling gas purging is logical Road (7) is used to be blown coal gas, coke-stove gas or blast furnace gas.