CN217210224U - Lump ore pretreatment system based on rotary kiln - Google Patents
Lump ore pretreatment system based on rotary kiln Download PDFInfo
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- CN217210224U CN217210224U CN202120608539.0U CN202120608539U CN217210224U CN 217210224 U CN217210224 U CN 217210224U CN 202120608539 U CN202120608539 U CN 202120608539U CN 217210224 U CN217210224 U CN 217210224U
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Abstract
A lump ore pretreatment system based on a rotary kiln comprises a lump ore raw material conveying device (1), a rotary kiln (2), a primary dried material conveying device (3) and a lump ore drying bin (4); wherein: a discharge hole of the lump ore raw material conveying device (1) is connected to a feed hole (201) at the tail of the rotary kiln (2), and a discharge hole (202) at the head of the rotary kiln (2) is connected to a feed hole (401) of the lump ore drying bin (4) through the material conveying device (3) after primary drying; a rotary kiln heat medium inlet (203) and a rotary kiln heat medium outlet (204) are arranged on the rotary kiln (2); the lump ore drying bin (4) is provided with a lump ore drying bin heat medium inlet (402) and a lump ore drying bin heat medium outlet (403). Adopt the utility model discloses a system can furthest reduce lump ore moisture, increases the ratio of lump ore in the furnace charge is gone into to the blast furnace, has apparent effect to the blast furnace direct motion and improvement steel mill economic benefits.
Description
Technical Field
The utility model relates to a lump ore pretreatment systems, concretely relates to pretreatment systems based on rotary kiln to moisture content, lump ore powder belongs to steel smelting technical field.
Background
The consumption of steel as an irreplaceable structural and functional material in the process of industrialization occupies more than 95 percent of the total consumption of metal in a quite long time. The raw pig iron materials required by the iron and steel industry are mainly provided by blast furnace smelting, and the improvement of the blast furnace smelting technology and the reduction of the cost have profound significance for promoting the development of iron and steel enterprises. The basic link of blast furnace intensified smelting is fine material operation, natural lump ore is used as one of main components of charging material, the addition amount of the natural lump ore can reach 20% at most, and as the lump ore contains a large amount of powder with the grain size smaller than 8mm and more moisture, airflow distribution in the furnace is abnormal after the lump ore enters the blast furnace, so that fuel ratio, coke ratio and ore consumption are improved.
Common furnace charging materials for blast furnaces include sintered ores, pellets and natural lump ores. The reasonable blast furnace charging material structure is that the optimum matching proportion of different types of iron-containing ores is found by adjusting the proportion of sintered ores, pellets and natural lump ores in the charged iron ores, so that various economic and technical indexes of blast furnace smelting under the charging material structure are relatively ideal, and the consumption cost of unit pig iron smelting is relatively lowest. Research shows that the cost expenditure of iron ore and other raw material links accounts for about 60 percent of the total cost of the pig iron. Lump ore is a main raw material used in metallurgical industry production, and is a raw ore with a certain particle size obtained by crushing, screening and processing after mining, the lump ore usually needs to be watered and subjected to dust suppression treatment in the mining process, dust formed in the mining process can be adhered to the surface of the ore after being soaked in water and is not easy to be screened and removed, so that a large amount of powder can be entrained to enter the metallurgical reduction process, and finally the air permeability of furnace burden can be deteriorated. Obviously, increasing the charging ratio of lump ore is an effective measure for reducing the raw material cost of the blast furnace. At present, the charging proportion of lump ore is generally 5-15%, and the proportion is low, because the charging of lump ore has the following main problems: (1) the water content of the lump ore is high, generally 8-15%, and the water content of the lump ore in rainy season of individual port steel mills even exceeds 20%. After the high-moisture lump ore is fed into the furnace, energy is consumed for moisture drying, a certain time is needed in the drying process, and the coke ratio of the blast furnace is improved; (2) the lump ore powder content is high, and the amount of the lump ore powder which is not subjected to screening treatment is about 30 percent. After the high-powder lump ore is fed into the furnace, the air permeability level of the blast furnace is reduced, the normal production of the blast furnace is influenced, and the influence on the smooth operation of the steel process and the economic benefit of a steel mill is obvious.
At present, due to the fact that the powder material is high in viscosity and high in dust rate, effective grading and granule finishing of lump ore are difficult to achieve through a pre-iron screening technology. As the water content of the lump ore reaches 12 percent, the screening effect is not ideal, and the powder ore adhered to the surface of the lump ore finally enters the blast furnace, thereby influencing the air permeability of the blast furnace, increasing the smelting cost of the blast furnace and influencing the stability of the furnace condition. (1) The lump ore is directly fed into the furnace without being pretreated. Because the lump ore has large moisture and high powder content, the lump ore which is not pretreated directly enters the furnace, which not only consumes energy, improves the coke ratio of the blast furnace, but also reduces the air permeability level of the blast furnace, influences the normal production of the blast furnace, and has obvious influence on the smooth steel process and the economic benefit of a steel mill. (2) And (4) screening and pretreating the lump ore, and directly feeding the lump ore into a furnace. The moisture content of the lump ore after the screening pretreatment is high, energy is consumed for moisture drying after the lump ore is directly fed into the blast furnace, a certain time is required in the drying process, and the coke ratio of the blast furnace is improved. (3) Drying and pretreating lump ore by a cylinder, and directly feeding into a furnace. After the lump ore is subjected to cylinder drying treatment, the moisture content of the lump ore still reaches 2% -6%, energy is consumed for moisture drying, a certain time is needed in the drying process, the coke ratio of the blast furnace is improved, and the normal production of the blast furnace is influenced. Moreover, the content of lump ore powder after cylinder drying pretreatment is still high, and after the high-powder lump ore is fed into the furnace, the air permeability level of the blast furnace is reduced, the normal production of the blast furnace is influenced, and the influence on smooth steel flow and the economic benefit of a steel mill is obvious.
Therefore, the reduction of the water content and the dust content in the lump ore has important significance for controlling the iron-making cost and enhancing the stability of the furnace condition. At present, lump ore drying systems have the difficult problems of high construction cost, low drying efficiency, high energy consumption and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses carry out the preliminary treatment of pertinence to the high moisture problem that the lump ore was gone into the stove, the technical problem who plans to solve as follows: (1) the utility model firstly adopts the drying procedure of the rotary kiln, utilizes the characteristics of abundant resources such as blast furnace gas in the steel process, introduces the blast furnace gas into a drying system of the rotary kiln, dries the materials in the rotary kiln through high temperature, and reduces the moisture of lump ore to 2-6%; (2) and then, a drying procedure of a lump ore drying bin is adopted, and the characteristics of abundant resources such as hot waste gas in the steel process and the like are utilized, so that the hot waste gas is introduced into the lump ore drying bin nearby, the materials are directly dried in the bin, and the moisture of the lump ore is reduced to below 1%. The utility model discloses a two steps of drying processes reduce lump ore moisture to furthest, and the lump ore need not the drying in the blast furnace, and the ratio of multiplicable lump ore in the furnace charge is gone into to the blast furnace, has apparent effect to the blast furnace direct motion and improvement steel mill economic benefits.
The utility model discloses a system simple and easy, practical, reliable, the abundant characteristics of resources such as the hot waste gas of make full use of steel plant effectively reduce lump ore preliminary treatment cost, solve the lump ore and go into a stove difficult problem, improved blast furnace lump ore and gone into stove proportion and gas permeability level, effectively reduced blast furnace manufacturing cost, improved the blast furnace level of going forward.
According to the utility model discloses an embodiment provides a lump ore pretreatment systems based on rotary kiln.
A lump ore pretreatment system based on a rotary kiln comprises a lump ore raw material conveying device, the rotary kiln, a primary dried material conveying device and a lump ore drying bin. Wherein: the discharge hole of the lump ore raw material conveying device is connected to the feed inlet at the tail of the rotary kiln, and the discharge hole at the head of the rotary kiln is connected to the feed inlet of the lump ore drying bin through the once dried material conveying device. The rotary kiln is provided with a rotary kiln heat medium inlet and a rotary kiln heat medium outlet. And a heat medium inlet and a heat medium outlet of the lump ore drying bin are arranged on the lump ore drying bin.
Preferably, the system further comprises a screening device. And a dried material outlet is formed in the bottom of the lump ore drying bin. The dry material export is connected to the feed inlet of screening plant upper reaches through secondary drying back material conveyor.
Preferably, the system further comprises a blast furnace. And an oversize material outlet is arranged at the downstream of the screening device and is connected with a feed inlet of the blast furnace through a conveying device.
Preferably, the system further comprises a sinter batch system. And a screen underflow discharge port is formed at the bottom of the screening device. The screen underflow discharge port is connected to the sintering batching system through a conveying device.
The utility model discloses in, the screening device is one of powerful sieve, ripple sieve, cantilever sieve.
Preferably, a heat medium flow guide device is arranged in the lump ore drying bin. The heat medium guide device is provided with a heat medium guide inlet and a heat medium guide outlet. And a heat medium inlet of the lump ore drying bin is communicated with the heat medium diversion inlet.
Preferably, 1-20 heat medium diversion devices, preferably 2-5 heat medium diversion devices are arranged in the lump ore drying bin. And the heat medium diversion inlets of all the heat medium diversion devices are communicated with the heat medium inlet of the lump ore drying bin.
Preferably, each heat medium flow guiding device is provided with 1-200 heat medium flow guiding outlets, preferably 2-100 heat medium flow guiding outlets.
The utility model discloses in, the kiln tail of rotary kiln is set up to the rotary kiln heat medium entry, and the kiln head of rotary kiln is set up to the rotary kiln heat medium export.
The utility model discloses in, dry feed bin heat medium entry of lump ore sets up in the middle part or the lower part of dry feed bin of lump ore, and the export of dry feed bin heat medium of lump ore sets up on the upper portion or the top of dry feed bin of lump ore.
The utility model discloses in, be equipped with the high temperature exhaust outlet on the blast furnace, the high temperature exhaust outlet is through first hot medium pipeline and rotary kiln hot medium entry intercommunication.
Preferably, the high-temperature waste gas outlet is communicated to the heat medium inlet of the lump ore drying bin through a second heat medium conveying pipeline.
The utility model discloses in, screening plant's sieve mesh size is 5 ~ 30mm, and preferably 5 ~ 10 mm.
Preferably, a moisture detection device is arranged at a dried material outlet of the lump ore drying bin.
The utility model provides a lump ore deposit pretreatment systems based on rotary kiln. The utility model discloses to the big difficult problem of moisture that natural lump ore exists, provided the interior dry preliminary treatment method of dry + lump ore drying feed bin of rotary kiln. The utility model discloses in, the piece ore deposit is at first through the moisture in the rotary kiln drying process desorption piece ore deposit, and wet piece ore deposit is added by the feed inlet of rotary kiln tail, and wet piece ore deposit descends from the upper portion slope and enters into the kiln in with the hot wall contact of rotary kiln, and the heat that gets into the hot medium in the rotary kiln (like blast furnace gas) passes to the outer wall by the inner wall of cylinder, passes the piece ore deposit on adhering to the outer wall of cylinder to reduce the moisture in the piece ore deposit rapidly. And further removing the moisture of the lump ore after primary drying through a drying procedure in the lump ore drying bin, wherein a heat source required by secondary drying in the lump ore drying bin comes from resources such as hot waste gas of an iron and steel plant. Because lump ore is through the rotary kiln drying process after, moisture content probably still exists the condition not up to standard, for example, after the rotary kiln is dry, the moisture content of lump ore still is up to 2% -6%, consequently, the utility model discloses introduce the secondary drying in the dry feed bin of lump ore on the dry basis of rotary kiln, further reduce lump ore moisture to below 1%, effectively solve the dry problem that moisture content is still higher inadequately of lump ore to ensure that the blast furnace normally produces. In addition, the lump ore drying bin is used as a storage bin of the lump ore, the lump ore is directly further dried in the bin, a new device does not need to be added, and the construction cost of the drying system is effectively controlled. The utility model discloses a rotary kiln is once dry + two steps of drying processes of secondary drying in the dry feed bin of lump ore, furthest has reduced the moisture level of lump ore, and the lump ore need not the drying in the blast furnace, and the ratio of multiplicable lump ore in the furnace charge is gone into to the blast furnace has apparent effect with improvement steel mill economic benefits in the same direction as going with the blast furnace.
The utility model provides a pretreatment methods is simple and easy, practical, reliable, does benefit to the engineering and popularizes and applies, compares with current dry flow technology, the utility model discloses a dry pretreatment techniques in dry feed bin of rotary kiln + lump ore, the moisture desorption of lump ore is efficient, has solved a lump ore and has gone into a stove difficult problem, has improved blast furnace lump ore and has gone into a stove proportion, has effectively reduced blast furnace manufacturing cost, has improved blast furnace direct-moving level. The popularization of the utility model has good economic, social and environmental benefits, and is expected to open up a more stable and efficient way for the development of the lump ore pretreatment process in China.
As preferred scheme, the utility model discloses a dry + screening process, the rotary kiln is dry once promptly + secondary is dry + screening in the dry feed bin of lump ore. The method comprises the steps of firstly removing moisture in lump ore to be treated through a rotary kiln drying procedure, introducing blast furnace gas and the like into a rotary kiln drying system by utilizing the characteristic of abundant resources of the blast furnace gas and the like in the steel process, and carrying out primary drying pretreatment on the lump ore in a rotary kiln to reduce the moisture of the lump ore (for example, reducing the moisture of the lump ore to 2% -6%). Conveying the lump ore subjected to primary drying to a lump ore drying bin, introducing hot waste gas into the lump ore drying bin nearby by utilizing the characteristic of abundant hot waste gas resources in the steel process, directly performing secondary drying on the materials in the bin, and further reducing the moisture of the lump ore to below 1%. And conveying the lump ore subjected to secondary drying to a screening device, and removing powder attached to the lump ore through a screening process. And directly feeding oversize products obtained in the screening process into a blast furnace for smelting, and returning undersize products to a sintering batching system.
It should be noted that, because natural lump ore moisture content is high, the powder viscosity is big, directly sieve the lump ore and handle and be difficult to realize effective grading, the whole grain to the lump ore, the lump ore can produce about 10% new powder again through the process of picking up, unrestrained of rotary kiln drying process in rotary kiln drying process, dry in-process also can further produce new powder in the dry feed bin of lump ore, consequently the utility model discloses select earlier through drying process in rotary kiln and the dry feed bin of lump ore to the preliminary treatment of lump ore, then get into the screening process. The lump ore after double drying is sieved again, the sieving efficiency is higher, the grading effect is better, and new powder generated in the drying process in the rotary kiln and the lump ore drying bin can be sieved together.
The utility model discloses in, the powerful sieve comprises sieve and bracket, thereby relies on the flexible sieve horizontal vibration of messenger's sieve lower part spring to realize the screening to lump ore deposit. In the screening process, the amplitude range of the bottom spring is 15-20mm, and small-particle-size lump ores are separated through the openings in the screen plate. In the actual production, a multi-section screen surface vibration mode is adopted, so that the grading separation of lump ores with different grain diameters is realized, and the processing capacity can reach 800 t/h.
The utility model discloses in, the exciting device of ripple sieve can be according to the technological parameter of the physical characteristic adjustment exciting force of screening lump ore deposit to make the material loose and separate under the acceleration of gravity effect. During the screening process, the screen plate is continuously vibrated within the range of 15-20mm, so that fine particles smaller than 8mm in the lump ore reach the openings of the screen holes and pass through the screen. In the operation process, the screening of lump ore is realized by adjusting the opening size and the opening rate of the screen plate, and the processing capacity can reach 500 t/h.
The utility model discloses in, the shale shaker of cantilever sieve comprises the straight excellent grizzly strip of upper strata and lower floor's net stick grizzly strip, and wherein the clearance of straight excellent grizzly strip is 8.0-12.0mm, and lower floor's net stick grizzly strip clearance is 6.5-8.0mm, and the separation of its double screen cloth can make lump ore deposit obtain more accurate control. The screening process is completed through two steps, firstly, materials with the particle size of less than 12.0mm fall to the lower layer of net-shaped screen bars through the upper layer of straight bar screen bars, then the materials with the particle size of less than 6.5mm are further separated through the net-shaped screen bars, fine particles with the particle size of less than 8mm in the materials are separated through the synergistic vibration of the upper layer of screen bars and the lower layer of screen bars, the maximum feeding particle size can reach 300mm, the screening efficiency can reach more than 85%, and the processing capacity can reach 700 t/h.
The utility model discloses in, the required heat source of rotary kiln drying and lump ore drying feed bin drying is produced hot waste gas or blast furnace gas, converter gas and the burning of coke oven gas in iron and steel plant self production process, iron and steel plant waste gas such as the hot waste gas that the blast furnace produced etc.. That is, the heat medium in the present invention may be hot exhaust gas having a relatively high temperature, or may be hot air subjected to heat treatment. Generally, the temperature of the heat medium is higher than 100 ℃.
The utility model discloses in, the drying temperature of rotary kiln stoving process is 100 ~ 900 ℃, and preferred 400 ~ 800 ℃. The drying time is 10-300 min, preferably 20-60 min. The hot air flow is 10000-300000 m 3 Preferably 100000-200000 m 3 /h。
The temperature of hot waste gas in the drying process in the lump ore drying bin is 100-300 ℃, and preferably 150-250 ℃. The drying time is 1-10 h, preferably 2-5 h. The hot air flow is 100000-300000 m 3 Preferably 150000 to 200000m 3 /h。
According to the block ore pretreatment system provided by the utility model, natural block ore is conveyed to the rotary kiln through the block ore raw material conveying device, the block ore is dried in the rotary kiln for one time, and gas-solid heat exchange is carried out with a heat medium, so that the moisture content in the block ore is reduced; conveying the lump ore dried in the rotary kiln to a lump ore drying bin through a material conveying device after primary drying, storing the lump ore in the lump ore drying bin, and performing secondary drying in the lump ore drying bin to further reduce the moisture content in the lump ore; and conveying the dried lump ore in the lump ore drying bin to a screening device through a material conveying device after secondary drying, screening the lump ore after secondary drying according to the particle size or the particle diameter through the screening device, and conveying oversize materials (namely the dried large-particle-diameter lump ore subjected to secondary moisture reduction and particle diameter screening) meeting the particle diameter requirement on the screen to a blast furnace to enter a smelting process.
The utility model discloses in, the piece ore deposit is after sieving the device, and screening plant's undersize thing can be carried to sintering feed proportioning system, and the undersize thing gets into the sintering process.
The utility model discloses in, be equipped with heat medium guiding device in the dry feed bin of lump ore for heat medium distributes evenly in the dry feed bin of lump ore, and the contact of lump ore and heat medium is more abundant, thereby the moisture content in the more effectual reduction lump ore.
The utility model discloses in, the dry feed bin of lump ore utilizes the dry feed bin of lump ore as the storage feed bin to the dry process's of lump ore place and device, make full use of current equipment resource, only need set up hot-medium entry and hot-medium export on original dry feed bin of lump ore, can realize the secondary dehydration process of lump ore.
As a preferred scheme, a heat medium flow guide device is arranged in a lump ore drying bin, so that lump ore is fully contacted with a heat medium, the dehydration effect of the lump ore is improved, the moisture content in the lump ore before entering the blast furnace meets the requirement, the energy consumption of the blast furnace is reduced, the normal operation of blast furnace procedures is ensured, the quality of blast furnace products is improved, and meanwhile, the production cost is saved.
Compared with the prior art, the technical scheme of the utility model following beneficial technological effect has:
1. the water removal effect is good. The utility model discloses a rotary kiln + dual stoving process of dry feed bin of lump ore utilizes the abundant characteristics of resources such as the hot waste gas of steel process, introduces rotary kiln and the dry feed bin of lump ore with hot waste gas etc. and carries out the drying to the material that gets into in the drying system through the gas-solid heat exchange, reduces the moisture content of lump ore rapidly, can reduce the moisture of lump ore to below 1%.
2. The powder removal rate is high. The utility model discloses a screening process utilizes the screen frame of special material and shape, the powder in the dry back lump ore deposit of high-efficient screening according to the characteristics that lump ore material powder is in large quantity, granularity range is wide, viscidity is strong. Lump ore is firstly through the dual drying in rotary kiln and the dry feed bin of lump ore, then sieves, can sieve the processing with the new powder that produces in the drying process in the lump, and its screening efficiency is higher after the lump ore is dried moreover, and grading effect is better.
3. The utility model discloses a system simple and easy, practical, reliable, do benefit to the engineering and popularize and apply, the utility model discloses combine the dry + dry in the dry feed bin of rotary kiln + lump ore + the preprocessing technique of screening, the moisture desorption effect of lump ore is good, the powder desorption rate is high, solves the lump ore and goes into a stove difficult problem, has improved blast furnace lump ore and has gone into stove proportion and gas permeability level, has effectively reduced blast furnace manufacturing cost, has improved blast furnace direct-moving level.
Drawings
Fig. 1 is a schematic structural diagram of a lump ore pretreatment system based on a rotary kiln of the present invention;
FIG. 2 is a schematic structural view of the lump ore pretreatment system of the present invention with a screening device;
FIG. 3 is a schematic structural view of the lump ore pretreatment system of the present invention, in which a blast furnace, a sintering proportioning system and a moisture detection device are arranged;
fig. 4 is a top view of the heat medium guiding device in the lump ore pretreatment system of the present invention.
Reference numerals are as follows:
1: a lump ore raw material conveying device; 2: a rotary kiln; 201: a feed inlet of the rotary kiln; 202: a discharge port of the rotary kiln; 203: a rotary kiln heat medium inlet; 204: a rotary kiln heat medium outlet; 3: a material conveying device after primary drying; 4: drying a bulk ore bin; 401: a feed inlet of a lump ore drying bin; 402: a hot medium inlet of a lump ore drying bin; 403: a heat medium outlet of the lump ore drying bin; 404: a dried material outlet of the lump ore drying bin; 405: a thermal medium flow guide device; 40501: a heat medium flow guide inlet; 40502: a heat medium diversion outlet; 5: a screening device; 501: a feed inlet of a screening device; 502: an oversize material outlet of the screening device; 503: a screen underflow outlet of the screening device; 6: a material conveying device after secondary drying; 7: a blast furnace; 701: a high-temperature waste gas outlet; 8: a sintering batching system; 9: a moisture detection device; l1: a first heat medium transport pipe; l2: a second thermal medium delivery conduit.
Detailed Description
The technical solution of the present invention is illustrated below, and the claimed invention includes but is not limited to the following embodiments.
According to the utility model discloses an embodiment provides a lump ore pretreatment systems based on rotary kiln.
A lump ore pretreatment system based on a rotary kiln comprises a lump ore raw material conveying device 1, a rotary kiln 2, a primary dried material conveying device 3 and a lump ore drying bin 4. Wherein: the discharge hole of the lump ore raw material conveying device 1 is connected to the rotary kiln feed hole 201 at the tail of the rotary kiln 2, and the discharge hole 202 at the head of the rotary kiln 2 is connected to the lump ore drying bin feed hole 401 of the lump ore drying bin 4 through the primary drying material conveying device 3. The rotary kiln 2 is provided with a rotary kiln heat medium inlet 203 and a rotary kiln heat medium outlet 204. The lump ore drying bin 4 is provided with a lump ore drying bin heat medium inlet 402 and a lump ore drying bin heat medium outlet 403.
Preferably, the system further comprises a screening device 5. And a dried material outlet 404 is arranged at the bottom of the lump ore drying bin 4. The dried material outlet 404 is connected to the feed inlet screening device upstream of the screening device 5 by the post-secondary-drying material conveying device 6.
Preferably, the system further comprises a blast furnace 7. An oversize material outlet 502 is arranged at the downstream of the screening device 5, and the oversize material outlet 502 is connected to the feed inlet of the blast furnace 7 through a conveying device.
Preferably, the system further comprises a sinter batch system 8. The bottom of the screening device 5 is provided with a screen underflow outlet 503. The undersize discharge 503 is connected to the sinter batching system 8 by a conveying device.
The utility model discloses in, screening plant 5 is one of brute force sieve, ripple sieve, cantilever sieve.
Preferably, a heat medium diversion device 405 is arranged in the lump ore drying bin 4. The heat medium flow guide device 405 is provided with a heat medium flow guide inlet 40501 and a heat medium flow guide outlet 40502. The heat medium inlet 402 of the lump ore drying bin is communicated with the heat medium diversion inlet 40501.
Preferably, 1 to 20 heat medium diversion devices 405, preferably 2 to 5 heat medium diversion devices 405 are arranged in the lump ore drying silo 4. The heat medium diversion inlets 40501 of all the heat medium diversion devices 405 are communicated with the heat medium inlet 402 of the lump ore drying bunker.
Preferably, each heat medium guiding device 405 is provided with 1 to 200 heat medium guiding outlets 40502, preferably 2 to 100 heat medium guiding outlets 40502.
The utility model discloses in, rotary kiln hot medium entry 203 sets up the kiln tail at rotary kiln 2, and rotary kiln hot medium export 204 sets up the kiln head at rotary kiln 2.
The utility model discloses in, dry feed bin heat-medium entry 402 of lump ore sets up in the middle part or the lower part of dry feed bin 4 of lump ore, and dry feed bin heat-medium export 403 of lump ore sets up on the upper portion or the top of dry feed bin 4 of lump ore.
The utility model discloses in, be equipped with high temperature exhaust outlet 701 on the blast furnace 7, high temperature exhaust outlet 701 communicates with rotary kiln hot-medium inlet 203 through first hot-medium conveying pipe way L1.
Preferably, the high temperature exhaust gas outlet 701 is communicated to the lump ore drying bunker thermal medium inlet 402 through a second thermal medium conveying pipeline L2.
The utility model discloses in, screening plant 5's sieve mesh size is 5 ~ 30mm, and the preferred is 5 ~ 10 mm.
Preferably, a moisture detection device 9 is arranged at the dried material outlet 404 of the lump ore drying bunker 4.
Example 1
As shown in fig. 1, the lump ore pretreatment system based on the rotary kiln comprises a lump ore raw material conveying device 1, a rotary kiln 2, a primary dried material conveying device 3 and a lump ore drying bin 4. Wherein: the discharge hole of the lump ore raw material conveying device 1 is connected to the rotary kiln feed hole 201 at the tail of the rotary kiln 2, and the discharge hole 202 at the head of the rotary kiln 2 is connected to the lump ore drying bin feed hole 401 of the lump ore drying bin 4 through the once dried material conveying device 3. The rotary kiln 2 is provided with a rotary kiln heat medium inlet 203 and a rotary kiln heat medium outlet 204. The lump ore drying bin 4 is provided with a lump ore drying bin heat medium inlet 402 and a lump ore drying bin heat medium outlet 403.
Example 2
As shown in fig. 2, the lump ore pretreatment system based on the rotary kiln comprises a lump ore raw material conveying device 1, a rotary kiln 2, a primary dried material conveying device 3 and a lump ore drying bin 4. Wherein: the discharge hole of the lump ore raw material conveying device 1 is connected to the rotary kiln feed hole 201 at the tail of the rotary kiln 2, and the discharge hole 202 at the head of the rotary kiln 2 is connected to the lump ore drying bin feed hole 401 of the lump ore drying bin 4 through the primary drying material conveying device 3. The rotary kiln 2 is provided with a rotary kiln heat medium inlet 203 and a rotary kiln heat medium outlet 204. The lump ore drying bin 4 is provided with a lump ore drying bin heat medium inlet 402 and a lump ore drying bin heat medium outlet 403. The system further comprises a screening device 5. And a dried material outlet 404 is arranged at the bottom of the lump ore drying bin 4. The dried material outlet 404 is connected via the post-secondary drying material conveying device 6 to the screening device feed inlet 501 upstream of the screening device 5.
Example 3
As shown in fig. 3, the lump ore pretreatment system based on the rotary kiln comprises a lump ore raw material conveying device 1, a rotary kiln 2, a primary dried material conveying device 3 and a lump ore drying bin 4. Wherein: the discharge hole of the lump ore raw material conveying device 1 is connected to the rotary kiln feed hole 201 at the tail of the rotary kiln 2, and the discharge hole 202 at the head of the rotary kiln 2 is connected to the lump ore drying bin feed hole 401 of the lump ore drying bin 4 through the primary drying material conveying device 3. The rotary kiln 2 is provided with a rotary kiln heat medium inlet 203 and a rotary kiln heat medium outlet 204. The rotary kiln heat medium inlet 203 is arranged at the tail of the rotary kiln 2, and the rotary kiln heat medium outlet 204 is arranged at the head of the rotary kiln 2. The lump ore drying bin 4 is provided with a lump ore drying bin heat medium inlet 402 and a lump ore drying bin heat medium outlet 403. A lump ore drying bin thermal medium inlet 402 is provided at the lower portion of the lump ore drying bin 4, and a lump ore drying bin thermal medium outlet 403 is provided at the top of the lump ore drying bin 4.
The system further comprises a screening device 5. And a dried material outlet 404 is arranged at the bottom of the lump ore drying bin 4. The dried material outlet 404 is connected via the post-secondary drying material conveying device 6 to the screening device feed inlet 501 upstream of the screening device 5.
The system also comprises a blast furnace 7. An oversize material outlet 502 is arranged at the downstream of the screening device 5, and the oversize material outlet 502 is connected to the feed inlet of the blast furnace 7 through a conveying device.
The system also includes a sinter batch system 8. The bottom of the screening device 5 is provided with a screen underflow outlet 503. The undersize discharge 503 is connected to the sinter batching system 8 by a conveying device.
Example 4
Example 3 was repeated except that the screening device 5 was a heavy duty screen.
Example 5
Example 3 was repeated except that the screening device 5 was a corrugated screen.
Example 6
Example 3 was repeated except that the screening device 5 was a cantilever screen.
Example 7
As shown in fig. 4, example 4 is repeated except that a heat medium guiding device 405 is provided in the lump ore drying silo 4. The heat medium flow guide device 405 is provided with a heat medium flow guide inlet 40501 and a heat medium flow guide outlet 40502. The heat medium inlet 402 of the lump ore drying bin is communicated with the heat medium diversion inlet 40501.
Example 8
Example 7 was repeated except that 4 of the heat medium guiding devices 405 were provided in the lump ore drying silo 4. The heat medium diversion inlets 40501 of all the heat medium diversion devices 405 are communicated with the heat medium inlet 402 of the lump ore drying bunker. Each of the heat medium guiding devices 405 is provided with 15 heat medium guiding outlets 40502.
Example 9
Example 8 was repeated except that the blast furnace 7 was provided with a high-temperature exhaust gas outlet 701, and the high-temperature exhaust gas outlet 701 was communicated with the rotary kiln heat medium inlet 203 via a first heat medium conveying piping L1.
Example 10
Example 9 is repeated except that the high temperature off-gas outlet 701 is communicated to the lump ore drying bunker thermal medium inlet 402 through a second thermal medium transfer piping L2.
Example 11
Example 10 is repeated except that a moisture detection device 9 is arranged at the dried material outlet 404 of the lump ore drying bunker 4.
Example 12
Example 11 was repeated except that the screening device 5 had a mesh size of 8 mm.
Claims (15)
1. A lump ore pretreatment system based on a rotary kiln is characterized in that: the system comprises a lump ore raw material conveying device (1), a rotary kiln (2), a material conveying device (3) after primary drying and a lump ore drying bin (4); wherein: a discharge hole of the lump ore raw material conveying device (1) is connected to a rotary kiln feed hole (201) positioned at the tail of the rotary kiln (2), and a discharge hole (202) positioned at the head of the rotary kiln (2) is connected to a lump ore drying bin feed hole (401) of a lump ore drying bin (4) through the once-dried material conveying device (3); a rotary kiln heat medium inlet (203) and a rotary kiln heat medium outlet (204) are arranged on the rotary kiln (2); the lump ore drying bin (4) is provided with a lump ore drying bin heat medium inlet (402) and a lump ore drying bin heat medium outlet (403).
2. The system of claim 1, wherein: the system further comprises a screening device (5); a dried material outlet (404) is formed in the bottom of the lump ore drying bin (4); the dried material outlet (404) is connected to a screening device feed inlet (501) at the upstream of the screening device (5) through a secondary dried material conveying device (6).
3. The system of claim 2, wherein: the system also comprises a blast furnace (7); and an oversize material outlet (502) is arranged at the downstream of the screening device (5), and the oversize material outlet (502) is connected to a feed inlet of the blast furnace (7) through a conveying device.
4. The system of claim 3, wherein: the system further comprises a sintering batching system (8); a screen underflow discharge port (503) is formed in the bottom of the screening device (5); the undersize discharge port (503) is connected to the sintering batching system (8) through a conveying device.
5. The system of claim 2, wherein: the screening device (5) is one of a strong screen, a corrugated screen and a cantilever screen.
6. The system according to any one of claims 1-5, wherein: a heat medium flow guide device (405) is arranged in the lump ore drying bin (4); the heat medium flow guide device (405) is provided with a heat medium flow guide inlet (40501) and a heat medium flow guide outlet (40502); and a heat medium inlet (402) of the lump ore drying bin is communicated with the heat medium diversion inlet (40501).
7. The system of claim 6, wherein: 1-20 heat medium diversion devices (405) are arranged in the lump ore drying bin (4), and heat medium diversion inlets (40501) of all the heat medium diversion devices (405) are communicated with a heat medium inlet (402) of the lump ore drying bin.
8. The system of claim 7, wherein: 2-5 heat medium diversion devices (405) are arranged in the lump ore drying bin (4).
9. The system of claim 7, wherein: each heat medium flow guide device (405) is provided with 1-200 heat medium flow guide outlets (40502).
10. The system of claim 7, wherein: each heat medium flow guide device (405) is provided with 2-100 heat medium flow guide outlets (40502).
11. The system of any one of claims 1-5, 7-9, wherein: the rotary kiln heat medium inlet (203) is arranged at the kiln tail of the rotary kiln (2), and the rotary kiln heat medium outlet (204) is arranged at the kiln head of the rotary kiln (2); and/or
The lump ore drying bin heat medium inlet (402) is arranged in the middle or the lower part of the lump ore drying bin (4), and the lump ore drying bin heat medium outlet (403) is arranged in the upper part or the top of the lump ore drying bin (4).
12. The system of claim 6, wherein: the rotary kiln heat medium inlet (203) is arranged at the kiln tail of the rotary kiln (2), and the rotary kiln heat medium outlet (204) is arranged at the kiln head of the rotary kiln (2); and/or
The lump ore drying bin heat medium inlet (402) is arranged in the middle or the lower part of the lump ore drying bin (4), and the lump ore drying bin heat medium outlet (403) is arranged in the upper part or the top of the lump ore drying bin (4).
13. The system of claim 3, wherein: a high-temperature waste gas outlet (701) is formed in the blast furnace (7), and the high-temperature waste gas outlet (701) is communicated with the rotary kiln heat medium inlet (203) through a first heat medium conveying pipeline (L1); and/or
The high-temperature waste gas outlet (701) is communicated to a heat medium inlet (402) of a lump ore drying bin through a second heat medium conveying pipeline (L2).
14. The system according to any one of claims 2-5, wherein: the sieve mesh size of the sieving device (5) is 5-30 mm; and/or
And a moisture detection device (9) is arranged at a dried material outlet (404) of the lump ore drying bin (4).
15. The system of claim 14, wherein: the sieve mesh size of the screening device (5) is 5-10 mm.
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| CN202120608539.0U CN217210224U (en) | 2021-03-25 | 2021-03-25 | Lump ore pretreatment system based on rotary kiln |
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| CN202120608539.0U CN217210224U (en) | 2021-03-25 | 2021-03-25 | Lump ore pretreatment system based on rotary kiln |
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