CN103045848B - Preheating device for siderite magnetizing and calcinating rotary kiln and method for preheating lump ore - Google Patents
Preheating device for siderite magnetizing and calcinating rotary kiln and method for preheating lump ore Download PDFInfo
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- CN103045848B CN103045848B CN201210552447.0A CN201210552447A CN103045848B CN 103045848 B CN103045848 B CN 103045848B CN 201210552447 A CN201210552447 A CN 201210552447A CN 103045848 B CN103045848 B CN 103045848B
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Abstract
The invention relates to a preheating device for a siderite magnetizing and calcinating rotary kiln and a method for preheating lump ore. The reheating device is an equilateral polygon vertical preheating device, and the preheating device comprises a feed port, a storage warehouse, a discharge pipe, a preheating chamber, a push rod device, a discharge chute, a smoke outlet and a smoke circular pipe. The invention further provides a siderite magnetizing and calcinating rotary kiln comprising the preheating device. In addition, the invention further provides a method for preheating lump ore based on the siderite magnetizing and calcinating rotary kiln. According to the invention, the preheating device can effectively improve the heat transfer efficiency of the whole device, reduce the length dimension of the rotary kiln, reduce the covering area of the kiln body, reduce the heat consumption and the power consumption of the working procedures, reduce the difficulty of production operations and improve the production operation efficiency.
Description
Technical field
The present invention relates to rotary structure technical field, particularly preheating device and lump ore pre-heating mean for a kind of siderite magnetizing roast rotary kiln.
Background technology
Siderite is as a kind of important iron ore deposit, and its iron taste is low, ore dressing difficulty.Siderite main component is weakly alkaline ferrous carbonate (FeCO
3), under about 650-900 DEG C of temperature atmosphere condition, can generate ferromagnetic magnetic iron ore (Fe
3o
4), then after magnetic concentration, can produce ferrous grade and meet the metallurgical iron ore concentrate requiring.
3FeCO
3=Fe
3O
4+2CO
2+CO
Existing siderite magnetic roasting process has shaft furnace and kiln process.Shaft furnace process is used for the lump ore roasting of 30-70mm grade, and production capacity is on the low side.And lump ore multiselect kiln process explained hereafter below 25mm grade has larger production capacity.
The structure of existing siderite magnetizing roast rotary kiln is as shown in Figure 1: rotary kiln 11 can be divided into roast area (near kiln hood end) and preheating zone (close kiln tail end) at length direction, rotary kiln 11 is by 10 heat supplies of kiln hood burner, by 18 temperature adjustments of kiln body Secondary Air blower fan, sparring lump ore is directly sent in kiln by the emission of baiting chute 12 of kiln tail, after the high-temperature flue gas of kiln tail preheating zone 300-350 DEG C is lowered the temperature by metallic recuperator 13 heat exchange, enter deduster 14, process by chimney 17 and enter atmosphere through waste gas air-introduced machine 15.The combustion-supporting air blast 16 of kiln hood burner 10, blasts the interior preheating of metallic recuperator 13 by natural wind, then burns for kiln hood burner 10.
Kiln process magnetizing roast sparring lump ore technique, is that the lump ore below granularity 25mm is directly imported from kiln tail, and lump ore motion, completes successively preheating and magnetizing roast course of reaction from kiln tail toward kiln hood direction in kiln.Due to needs in kiln to lump ore carry out the pre-heat treatment and and magnetizing roast reaction treatment two procedures, therefore the kiln body of rotary kiln is longer, draw ratio is generally between 20:1-12:1.In addition, for make full use of kiln exit gas waste heat, meet the requirement of deduster to entrance flue gas temperature simultaneously, before kiln exit gas dedusting discharge, the metallic recuperator of one larger heat exchange area need be set, this heat exchanger is generally used for the combustion air of preheating for kiln hood burner, a corresponding supporting high pressure positive blower and the pipe-line system of arranging.
Existing kiln process magnetizing roast siderite technique, utilizes the preheating and the roasting two procedures that complete sparring lump ore compared with this equipment of the rotary kiln of big L/D ratio, has following outstanding problem:
(1) rotary kiln heat transfer efficiency is lower, for complete the warm of sparring lump ore in kiln, and the time of staying that need to be longer, thereby the length of rotary kiln is longer, floor space is large; Very easily there is ring formation in kiln in rotary kiln, the rotary kiln of longer size can cause ring formation probability to increase, and production operation difficulty is strengthened, and affects production operational availability; The kiln of longer size has also increased area of dissipation.
(2) kiln tail high-temperature flue gas waste heat recovery, needs to adopt large-area metallic recuperator, and its floor space is larger, though waste heat is recovered, but the hot-blast pipe line and the high pressure positive blower that increase have increased cost of investment, pipeline heat radiation has also reduced heat utilization efficiency, and blower fan power consumption also increases.Heat exchanger belongs to indirect heat exchange technique, compares with direct heat transfer technique, and indirect heat exchange technique exists heat transfer efficiency low, and floor space, construction investment are relatively large, the problem that equipment operation rate is relatively low.
Summary of the invention
(1) technical problem that will solve
The object of this invention is to provide a kind of siderite magnetizing roast rotary kiln preheating device and lump ore pre-heating mean, described preheating device can effectively improve the heat transfer efficiency of integral device; Reduce rotary kiln device length dimension, reduce kiln body floor space; Reduce operation hear rate and power consumption; Reduce production operation difficulty, improve production operational availability.
(2) technical scheme
Siderite magnetizing roast rotary kiln preheating device of the present invention is the vertical preheating device of regular polygon, described preheating device comprises charging aperture, storage bin, emission of baiting chute, preheating chamber, push rod device, feeding chute, exhanst gas outlet and flue gas ring pipe, described charging aperture is connected with storage bin, described storage bin bottom is evenly provided with the emission of baiting chute equating with regular polygon limit quantity, the preheating chamber of the corresponding inner lining refractory of each emission of baiting chute, push rod device of arranged outside of each preheating chamber, the outlet of each preheating chamber is connected with feeding chute, each preheating chamber top correspondence arranges an exhanst gas outlet, exhanst gas outlet is connected with flue gas ring pipe.
In described preheating device plane, be regular polygon multicell even distribution type structure, described preheating chamber is that regular polygon multicell even distribution type distributes in the horizontal direction.
The limit number of described regular polygon is no less than five.
Preferably, described regular polygon is regular pentagon, regular hexagon, octagon or dodecagon.
Described preheating chamber is vertical preheating furnace.Between described preheating chamber, with laying fireproof bricks, mutually isolate, the quantity of preheating chamber equates with regular polygon limit quantity.
Described push rod device is push rod device or the air-leg device of surging.
Another object of the present invention is to provide the siderite magnetizing roast rotary kiln that contains described preheating device.
Described siderite magnetizing roast rotary kiln also comprises kiln hood burner, combustion-supporting air blast, kiln body Secondary Air blower fan, deduster, waste gas air-introduced machine and chimney, described preheating device is positioned at the afterbody top of rotary kiln, the feeding chute of preheating device is connected with the kiln tail of rotary kiln, the flue gas ring pipe of preheating device is connected with deduster entrance, deduster is connected with waste gas air-introduced machine, waste gas air-introduced machine is connected with chimney, described kiln hood burner is connected with combustion-supporting air blast, and described kiln body Secondary Air blower fan is connected with rotary kiln body.
Described combustion-supporting air blast is fan with low voltage.
The draw ratio of described rotary kiln is not more than 10:1.
Preferably, the draw ratio of described rotary kiln is 10:1-7:1.
Another object of the present invention is to provide a kind of lump ore pre-heating mean based on described siderite magnetizing roast rotary kiln.Described method is that sparring lump ore enters storage bin by charging aperture, enter in the preheating chamber corresponding with it by emission of baiting chute again, enter in adverse current under 500-600 DEG C of high-temperature flue gas effect of preheating chamber, carry out the pre-heat treatment, the push rod device of preheating chamber arranged outside successively pushes the sparring lump ore of the pre-heat treatment in each preheating chamber in feeding chute to alternate cycles, send in rotary kiln, in rotary kiln, the high-temperature flue gas of 650-850 DEG C magnetizes siderite complete roasting.
The exhanst gas outlet that flue gas in described preheating chamber is provided with by preheating chamber top is drawn in flue gas ring pipe, enters deduster, then enters atmosphere through waste gas air-introduced machine and chimney.
Wherein, described in enter preheating chamber 500-600 DEG C of high-temperature flue gas be kiln tail high-temperature flue gas under the effect of described waste gas air-introduced machine, enter the high-temperature flue gas preheating chamber from feeding chute.
Wherein, the temperature of the corresponding exhanst gas outlet arranging in each preheating chamber top is controlled at higher than the above 40-50 DEG C of acid dew point.
Preferably, the temperature of the high-temperature flue gas in described rotary kiln is 750 DEG C.
Preferably, the high-temperature flue-gas that enters preheating chamber described in is 550 DEG C.
The temperature of described exhanst gas outlet is 150-220 DEG C.
(3) beneficial effect
Siderite magnetizing roast rotary kiln of the present invention has following advantage with preheating device and lump ore pre-heating mean:
(1) siderite magnetizing roast rotary kiln of the present invention is positioned at the afterbody top of rotary kiln with preheating device, is directly connected with rotary kiln, can directly utilize the waste heat of kiln tail high-temperature flue gas, effectively improves Whole Equipment heat transfer efficiency, and process energy consumption is reduced.
(2) the siderite magnetizing roast rotary kiln that contains described preheating device of the present invention, siderite preheating and magnetization reduction two procedures are separated in two autonomous devices and are completed, can effectively shorten rotary kiln length, make its draw ratio be not more than 10:1, reduce Whole Equipment floor space, economize the land resource, simultaneously, reduce ring formation of rotary kiln probability, reduce operation easier, improve operating rate.
(3) pre-heating mean of the present invention adopts direct heat transfer technique, has reduced operation hear rate and power consumption, saves the energy.
Brief description of the drawings
Fig. 1 is the structure chart of existing siderite magnetizing roast rotary kiln;
Fig. 2 is the structure chart of siderite magnetizing roast rotary kiln preheating device in the embodiment of the present invention;
Fig. 3 is the top view of the preheating device of Fig. 2;
Fig. 4 is that the preheating device of Fig. 2 is along the cutaway view of A-A direction;
Fig. 5 is that the preheating device of Fig. 2 is along the cutaway view of B-B direction;
Fig. 6 is the structure chart of the siderite magnetizing roast rotary kiln of the embodiment of the present invention;
In figure: 10 is kiln hood burner; 11 is rotary kiln; 12 is emission of baiting chute; 13 is metallic recuperator; 14 is deduster; 15 is waste gas air-introduced machine; 16 is combustion-supporting air blast; 17 is chimney; 18 is kiln body Secondary Air blower fan; 22 is preheating device; 221 is charging aperture; 222 is storage bin; 223 is emission of baiting chute; 224 is preheating chamber; 225 is push rod device; 226 is feeding chute; 227 is flue gas ring pipe; 228 is exhanst gas outlet.
Detailed description of the invention
Below in conjunction with drawings and Examples, siderite magnetizing roast rotary kiln of the present invention is described in further detail with preheating device and lump ore pre-heating mean.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
In description of the invention, it should be noted that, term " " center ", " ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of instructions such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " be only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
In addition,, in description of the invention, except as otherwise noted, the implication of " multiple " is two or more.
As shown in Figure 2-5, siderite magnetizing roast rotary kiln of the present invention is the vertical preheating device of regular polygon with preheating device 22, described preheating device 22 comprises charging aperture 221, storage bin 222, emission of baiting chute 223, preheating chamber 224, push rod device 225, feeding chute 226, exhanst gas outlet 228 and flue gas ring pipe 227, described charging aperture 221 is connected with storage bin 222, storage bin 222 bottoms are evenly provided with the emission of baiting chute 223 equating with regular polygon limit quantity, the preheating chamber 224 of each emission of baiting chute 223 corresponding inner lining refractories, push rod device 225 of arranged outside of each preheating chamber 224, the outlet of each preheating chamber 224 is connected with feeding chute 226, each preheating chamber 224 top correspondences arrange an exhanst gas outlet 228, exhanst gas outlet 228 is connected with flue gas ring pipe 227.
In described preheating device 22 planes, be regular polygon multicell even distribution type structure, described preheating chamber 224 is that regular polygon multicell even distribution type distributes in the horizontal direction.
The regular polygon of described preheating device 22 is octagon.
Described preheating chamber 224 is vertical preheating furnace.Between described preheating chamber 224, with laying fireproof bricks, mutually isolate, the quantity of preheating chamber 224 equates with regular polygon limit quantity.
Described push rod device 225 is push rod device or the air-leg device of surging.
As shown in Figure 6, siderite magnetizing roast rotary kiln 11 of the present invention contains above-mentioned preheating device 22, also comprise kiln hood burner 10, combustion-supporting air blast 16, kiln body Secondary Air blower fan 18, deduster 14, waste gas air-introduced machine 15 and chimney 17, described preheating device 22 is positioned at the afterbody top of rotary kiln 11, the feeding chute 226 of preheating device 22 is connected with the kiln tail of rotary kiln 11, the flue gas ring pipe 227 of preheating device 22 is connected with deduster 14 entrances, deduster 14 is connected with waste gas air-introduced machine 15, waste gas air-introduced machine 15 is connected with chimney 17, described kiln hood burner 10 is connected with combustion-supporting air blast 16, described kiln body Secondary Air blower fan 18 is connected with rotary kiln 11 kiln bodies.
Described combustion-supporting air blast 16 is fan with low voltage.
The draw ratio of described rotary kiln 11 is not more than 10:1.
Preferably, the draw ratio of described rotary kiln 11 is 10:1-7:1.
A kind of lump ore pre-heating mean based on described siderite magnetizing roast rotary kiln of the present invention is that sparring lump ore enters into storage bin 222 by charging aperture 221, sparring lump ore in storage bin 222 enters in the preheating chamber corresponding with it 224 by emission of baiting chute 223, make the filling of sparring lump ore be full of preheating chamber 224, the high-temperature flue gas of rotary kiln 11 kiln tails is under 15 effects of waste gas air-introduced machine, enter preheating chamber 224 from feeding chute 226 adverse currents, the high-temperature flue-gas that enters preheating chamber 224 is 500-600 DEG C, high-temperature flue gas air-flow in preheating chamber 224 with sparring lump ore countercurrent heat-transfer, with locellus heat exchange mode, complete heat transfer, the push rod device 225 of preheating chamber 224 arranged outside is worked in priority alternate cycles mode, the sparring lump ore of each preheating chamber 224 interior the pre-heat treatment successively circulation is pushed in feeding chute 226 in an orderly manner, finally send into rotary kiln 11.
Rotary kiln 11 heat supplies are completed by kiln hood burner 10, combustion-supporting air blast 16 is fan with low voltage, burns for kiln hood burner 10, and kiln body overfire air fan 18 regulates rotary kiln 11 internal temperatures, in rotary kiln 11, be 650-850 DEG C of high-temperature flue gas, siderite complete roasting is magnetized.The temperature of the corresponding exhanst gas outlet 228 arranging in each preheating chamber 224 tops is controlled at higher than the above 40-50 DEG C of acid dew point, flue gas is drawn into flue gas ring pipe 227 from exhanst gas outlet 228, enter deduster 14, the waste gas after dedusting enters atmosphere through waste gas air-introduced machine 15 and chimney 17.
Preferably, the temperature of the high-temperature flue gas in described rotary kiln is 750 DEG C.
Preferably, the high-temperature reductibility flue-gas temperature that enters preheating chamber 224 described in is 550 DEG C.
The temperature of described exhanst gas outlet 228 is 150-220 DEG C.
Siderite magnetizing roast rotary kiln of the present invention is positioned at the afterbody top of rotary kiln with preheating device, be directly connected with rotary kiln, can directly utilize kiln tail high-temperature flue gas waste heat, effectively improve Whole Equipment heat transfer efficiency, process energy consumption is reduced, and the rotary kiln length that can effectively shorten, makes its draw ratio be not more than 10:1 simultaneously, reduce Whole Equipment floor space, economize the land resource, reduce the operation easier of rotary kiln, reduce ring formation of rotary kiln probability, reduce operation easier, improve operating rate.
The limit number of the regular polygon of described preheating device is no less than 5, can be the regular polygon of other octagon in the present embodiment.
Above embodiment is only for illustrating the present invention, and be not limitation of the present invention, the those of ordinary skill in relevant technologies field, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all technical schemes that are equal to also belong to category of the present invention.
Claims (9)
1. a siderite magnetizing roast rotary kiln that contains preheating device, it is characterized in that: described rotary kiln comprises kiln hood burner, combustion-supporting air blast, kiln body Secondary Air blower fan, deduster, waste gas air-introduced machine and chimney, the afterbody top of described rotary kiln is provided with preheating device;
Wherein, described preheating device is the vertical preheating device of regular polygon, described preheating device comprises charging aperture, storage bin, emission of baiting chute, preheating chamber, push rod device, feeding chute, exhanst gas outlet and flue gas ring pipe, described charging aperture is connected with storage bin, described storage bin bottom is evenly provided with the emission of baiting chute equating with regular polygon limit quantity, the preheating chamber of the corresponding inner lining refractory of each emission of baiting chute, push rod device of arranged outside of each preheating chamber, the outlet of each preheating chamber is connected with feeding chute, each preheating chamber top correspondence arranges an exhanst gas outlet, exhanst gas outlet is connected with flue gas ring pipe,
The feeding chute of described preheating device is connected with the kiln tail of rotary kiln, the flue gas ring pipe of preheating device is connected with deduster entrance, deduster is connected with waste gas air-introduced machine, waste gas air-introduced machine is connected with chimney, described kiln hood burner is connected with combustion-supporting air blast, and described kiln body Secondary Air blower fan is connected with rotary kiln body.
2. rotary kiln according to claim 1, is characterized in that: described preheating chamber is in the horizontal direction for regular polygon multicell even distribution type distributes.
3. rotary kiln according to claim 2, is characterized in that: the limit number of described regular polygon is no less than five.
4. rotary kiln according to claim 3, is characterized in that: described regular polygon is regular pentagon, regular hexagon, octagon or dodecagon.
5. according to the rotary kiln described in claim 1-4 any one, it is characterized in that: described preheating chamber is vertical preheating furnace.
6. according to the rotary kiln described in claim 1-4 any one, it is characterized in that: described push rod device is push rod device or the air-leg device of surging.
7. rotary kiln according to claim 1, is characterized in that: the draw ratio of described rotary kiln is not more than 10:1.
8. the lump ore pre-heating mean of the siderite magnetizing roast rotary kiln based on described in claim 1-7 any one, it is characterized in that: described method is that sparring lump ore enters storage bin by charging aperture, enter in the preheating chamber corresponding with it by emission of baiting chute again, enter in adverse current under 500-600 DEG C of high-temperature flue gas effect of preheating chamber, carry out the pre-heat treatment, the push rod device of preheating chamber arranged outside successively pushes the sparring lump ore of the pre-heat treatment in each preheating chamber in feeding chute to alternate cycles, send in rotary kiln, in rotary kiln, the high-temperature flue gas of 650-850 DEG C magnetizes siderite complete roasting,
Wherein, described in enter preheating chamber 500-600 DEG C of high-temperature flue gas be kiln tail high-temperature flue gas under the effect of described waste gas air-introduced machine, enter the high-temperature flue gas preheating chamber from feeding chute.
9. method according to claim 8, is characterized in that: described in enter preheating chamber high-temperature flue-gas be 550 DEG C; The temperature of the high-temperature flue gas in described rotary kiln is 750 DEG C.
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|---|---|---|---|
| CN201210552447.0A CN103045848B (en) | 2012-12-18 | 2012-12-18 | Preheating device for siderite magnetizing and calcinating rotary kiln and method for preheating lump ore |
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| CN104004904B (en) * | 2014-06-16 | 2016-08-17 | 中南大学 | A kind of method of the magnetizing roast of high ferro waste residue or mineral |
| CN105586498B (en) * | 2016-03-14 | 2017-09-26 | 李宾 | The method of efficient step fork fraction rotary reduction furnace direct-reduction production ferronickel |
| CN108955237B (en) * | 2017-05-17 | 2020-06-12 | 赫章县黎明矿业有限公司 | Anaerobic magnetization reduction roasting system of siderite rotary kiln and roasting process thereof |
| CN113203291A (en) * | 2021-04-23 | 2021-08-03 | 中国恩菲工程技术有限公司 | Spodumene concentrate preheating device |
| CN116294570B (en) * | 2023-04-03 | 2023-12-01 | 内蒙古景蕾实业有限公司 | Medium-low grade manganese ore pretreatment rotary kiln and feeding system |
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