CN201172676Y - Process wind system of drying grate-rotary kiln-circular cooler for producing acid pellet - Google Patents

Process wind system of drying grate-rotary kiln-circular cooler for producing acid pellet Download PDF

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Publication number
CN201172676Y
CN201172676Y CNU2008200197594U CN200820019759U CN201172676Y CN 201172676 Y CN201172676 Y CN 201172676Y CN U2008200197594 U CNU2008200197594 U CN U2008200197594U CN 200820019759 U CN200820019759 U CN 200820019759U CN 201172676 Y CN201172676 Y CN 201172676Y
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China
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grate
drying
air
central cooler
drying grate
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Expired - Fee Related
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CNU2008200197594U
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张允茂
顾玲
李东浩
孟凡义
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顾玲
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Abstract

The utility model discloses a technique air system of a chain grate machine-rotary kiln-rotating annular cooler for producing oxidized pellets. The utility model comprises a multi-tube dust cleaner, a heat resisting fan, an electric dust cleaner, a main exhaust fan and multi-section air pipes, wherein the multi-tube dust cleaner and the heat resisting fan are connected in series into an air return system between the tail and the front ends of the chain grate machine through the air pipes, the electric dust cleaner and the main exhaust fan are connected in series into an air exhaust system of the chain grate machine through the air pipes, and an air return system is arranged between the chain grate machine and the rotating annular cooler. The technique air system of the utility model needs few devices, has convenient arrangement, compact structure among each device and small occupied area, and is suitable for the assembly line of the chain grate machine-rotary kiln-rotating annular cooler with small scale yield (smaller than or equal to 600 thousands tons/year), is much suitable for small and medium-sized mines, steel works and the improvement of vertical furnaces, and is more suitable for private enterprises, and saves investment. The air system has simple flow and convenient maintenance.

Description

Produce the technology wind system of the grate kiln-central cooler of acid pellet
(1) technical field
The utility model relates to a kind of technology wind system of production system of acid pellet, particularly a kind of technology wind system of producing the grate kiln-central cooler of acid pellet.
(2) background technology
Pellet has had the production history of decades as the high furnace charge of a kind of fine in China.Pellet has the ferrous grade height, and metallurgical performance is good, is fit to commercialization advantages such as long period storage and remote transportation.Use with agglomerate collocation, can effectively reduce blast furnace coke ratio and improve furnace processor, can make the blast furnace burden structure rationalization, finally make blast furnace reach high-quality, high yield, low consumption, efficient purpose.
Just be subjected to great attention abroad the seventies in 20th century, various pelletizing technologies have also obtained popularization and development energetically, and are wherein remarkable with the development of grate kiln pellet production line.Because that it has is strong to material condition adaptability, good product quality, energy consumption are low, pollution-free, and the characteristics of suitable scale operation.
At present the acid pellet production technique mainly contain three kinds: shaft furnace, belt type roasting machine, grate kiln.For a long time, China's pellet formation is mainly based on shaft furnace production, and shaft furnace is produced pelletizing, and quality is inhomogeneous, raw material difference bad adaptability, factors such as maximization difficulty, and restricted the development of China's pelletizing, also restrict the big proportioning of China's blast furnace and used pellet.
The seventies in last century, China's high basicity sinter rises, and pellet cooperates with it as iron-smelting raw material as acid burden material, and development has faster just been arranged.Shaft furnace can be made fuel with blast furnace gas, so grow up in each big steel factory, from nineteen sixty-eight since first 8m2 shaft furnace of Jinan Steelworks builds up, built up 76 shaft furnaces to 2004.Up to last century end, Shoudu Iron and Steel Co mining company will produce the equipment of sponge iron in the mine, Qian'an, be transformed into the coal dust is the grate kiln of fuel, produce the successful implementation of 1,200,000 tons of pellets per year, lay a good foundation for China's development grate kiln pelletizing process, also provide model in mine construction pelletizing plant for China.After this, Anshan iron and steel plant section chief mountain range iron ore, Wuhan Iron and Steel Plant Cheng Chao iron ore have been built up large-scale grate kiln pelletizing plant in succession, and to 2006, national grate kiln rose to 44 covers rapidly, also has a collection of grate kiln to build.Technology equipment of the big-and-middle-sized pelletizing plant of this batch and output are higher, and environmental protection is also better, and quality is also good, the pellet TFe of pelletizing plant>65% that has, and ultimate compression strength reaches more than the 2500N/ ball.The design, device fabrication and the production that indicate China grate kiln pelletizing plant step has gone up a new step, has formed the situation of shaft furnace pelletizing to the conversion of grate kiln pelletizing method.
The table 1-1 grate kiln that China builds over nearly 5 years
Throughput (ten thousand tons/year) ?500 ??240 ??200 ??120 ??80 ??60 ??40
Quantity (cover) ?1 ??5 ??3 ??6 ??11 ??12 ??6
The grate kiln pelletizing process is produced, technology advanced person, and the secondary energy utilization is abundant, clean environment; Pellet quality height, energy consumption are low, and economic benefit and environmental benefit are good.Grate kiln is produced pellet, because the superiority of its product, quite general abroad, domestic a lot of Steel Plant build up rotary kiln pellet production line in succession.The about 45kg mark of the acid pellet process energy consumption that chain grate machine-rotary kiln is produced coal/ton, and the agglomerating process energy consumption is marked coal/ton at 65kg, pellet per ton is than agglomerate saving mark coal 20kg, and reducing emission of carbon dioxide and sulfurous gas are about 20%, so and environmental protection be closely connected together.
Grate kiln pelletizing process flow process comprises material flow and gas flow process (see figure 1).By cloth green-ball drying and preheating on drying grate, solidify at the revolution roasting in kilns, in central cooler, cool off.Therefore selecting which kind of drying, preliminary heating device, roasting apparatus is the core of material flow; How the useless flue gas recirculation utilization of the heat of cooling pelletizing, farthest effectively utilizing is the key of gas flow process on drying, preheating and the sinter process of green-ball., all be important in the configuration of air quantity no matter from the design selection of technological design, Thermal Equipment.Chain grate machine-rotary kiln technology is able to fast development at home at present, and the technology wind system has played crucial effects.
Technological process adopts rational thermal regulation, makes full use of the backheat wind of pelletizing oxidation liberated heat and cooling pelletizing, to reduce burnup.From 950 ℃~1100 ℃ the high-temperature hot-air that one cold section of central cooler returns, to kiln hood, promptly do the incendiary secondary air by the rotary kiln head-shield, increase the kiln tail again and return to the oxygen level of drying grate preheating section, improve the degree of oxidation of pelletizing.About 500 ℃ the hot blast that returns from secondary cooling zone passes through the backheat wind system to the dry II section of drying grate, further makes the green-ball drying and dehydrating.Simultaneously about 350 ℃ hot blast returning of drying grate preheating section bellows to the dry I section of drying grate petticoat pipe, carries out drying to green-ball through fly-ash separator and heat resisting exhauster.The hot flue gas of rotary kiln is introduced in the preheating section preheating pelletizing of chain grate machine.Hot flue gas is recycled three utilizations, has reduced the discharging of dust on the one hand, and the utilization again of waste heat is annual energy-conservation more than 20%.
At present the wind system of chain grate machine-rotary kiln technology all is that bilateral is arranged: 2 multi-tube dust cleaners, 2 heat resisting exhausters, 2 electric precipitator, 1 bulging dry-air blast machine, 1 main exhauster and connect the process pipe of these equipment.This kind decoration form floor space is big, investment is big, is unsuitable for small-scale production.
(3) summary of the invention
The technical problems to be solved in the utility model is: a kind of technology wind system of producing the grate kiln-central cooler of acid pellet is provided, makes it need few, the convenient layout of equipment, be suitable for small-scale grate kiln-central cooler production line.
In order to solve the problems of the technologies described above, the utility model comprises a multi-tube dust cleaner, heat resisting exhauster, electric precipitator, main exhauster and multistage airduct, a described multi-tube dust cleaner, heat resisting exhauster are concatenated into air return system between the drying grate head and the tail by airduct, a described electric precipitator and main exhauster are concatenated into the outlet system of air of drying grate by airduct, are provided with air return system between drying grate and central cooler.
In order to improve dust removing effects, the air return system between described drying grate head and the tail also comprises a gravitational precipitator that is connected in series mutually with described multi-tube dust cleaner.
Use in order to be suitable for three sections drying grate systems, described drying grate is a three stage structure, comprise dry I section, dry II section and preheating section, air return system between described drying grate and central cooler is communicated with the dry II section of drying grate and the secondary cooling zone of central cooler, air return system between the drying grate head and the tail is communicated with preheating section and dry I section, and the outlet system of air of drying grate is communicated with the waste gas outlet and the chimney of dry I section and dry II section.
Use in the drying grate system in order to be suitable for four sections, described drying grate is the four-part form structure, comprise blasting drying period, down-draft drying zone, preheating I section and preheating II section, air return system between described drying grate and central cooler is communicated with the preheating I section of drying grate and the secondary cooling zone of central cooler, air return system between the drying grate head and the tail is communicated with preheating II section and down-draft drying zone and blasting drying period, and the outlet system of air of drying grate is communicated with the waste gas outlet and the chimney of blasting drying period, down-draft drying zone and preheating I section.
In order to regulate the temperature that enters blasting drying period gas, make it be fit to produce the rhombohedral iron ore acid pellet, air return system between described drying grate head and the tail is provided with the branch road (having saved bulging dry-air blast machine) towards blasting drying period, and is provided with on this branch road and converts cold blast valve and regulate the wind-warm syndrome that enters blasting drying period.
In order to purify the return air effect between drying grate and central cooler, be provided with a multi-tube dust cleaner and a heat resisting exhauster in the air return system between described drying grate and central cooler.
The beneficial effects of the utility model are: 1, the utility model technology wind system needs equipment few, the convenient layout, compact construction between each equipment, floor space is little, relatively is fit to the chain grate machine-rotary kiln-central cooler production line of output (smaller or equal to 600,000 tons/year) on a small scale.Relatively be fit to middle-size and small-size mine, Steel Plant and shaft furnace transformation, be more suitable for private enterprise.2, save investment.3, the wind system flow process is simple, and maintenance is convenient.
(4) description of drawings
Fig. 1 is the schema of the utility model specific embodiment one; Fig. 2 is the schema of the utility model specific embodiment two;
(5) embodiment
Specific embodiment one
As shown in Figure 1, this specific embodiment comprises air return system, the air return system between the drying grate head and the tail and the outlet system of air of drying grate between air-blast system, drying grate and the central cooler that connects central cooler.Drying grate in this specific embodiment is a three stage structure, comprises dry I section, dry II section and preheating section.Air return system between drying grate and central cooler comprises the airduct of the secondary cooling zone of the dry II section that is communicated with drying grate and central cooler, and a multi-tube dust cleaner and a heat resisting exhauster can be set on this airduct, also can not be provided with.Air return system between drying grate head and the tail comprises the airduct that is communicated with preheating section and dry I section, is arranged on a multi-tube dust cleaner and a heat resisting exhauster in this airduct, can join a heavy fly-ash separator in this air return system again.The outlet system of air of drying grate comprise the waste gas outlet that is communicated with dry I section and dry II section and chimney airduct, be arranged on an electric precipitator and a main exhauster in this airduct.
The green-ball of making carries out drying and forewarm by cloth system cloth on 1 drying grate, carry out fixed and roasting in 1 rotary kiln, cools off on 1 central cooler.From 950 ℃~1100 ℃ the high-temperature hot-air that one cold section of central cooler returns, to kiln hood, promptly do the incendiary secondary air by the rotary kiln head-shield, increase the kiln tail again and return to the oxygen level of drying grate preheating section, improve the degree of oxidation of pelletizing.About 500 ℃ the hot blast that returns from secondary cooling zone passes through backheat wind system (multi-tube dust cleaner and heat resisting exhauster) to the dry II section of drying grate, further makes the green-ball drying and dehydrating.Simultaneously about 350 ℃ hot blast returning of drying grate preheating section bellows to the dry I section of drying grate petticoat pipe, carries out drying to green-ball through multi-tube dust cleaner and heat resisting exhauster.The waste gas that dry I, II section are come out enters atmosphere through dedusting, main exhauster, chimney.
Specific embodiment two
As shown in Figure 2, this specific embodiment comprises air return system, the air return system between the drying grate head and the tail and the outlet system of air of drying grate between air-blast system, drying grate and the central cooler that connects central cooler.The drying grate of this specific embodiment is the four-part form structure, comprises blasting drying period, down-draft drying zone, preheating I section and preheating II section.Air return system between drying grate and central cooler comprises the airduct of the secondary cooling zone of the preheating I section that is communicated with drying grate and central cooler, and a multi-tube dust cleaner and a heat resisting exhauster can be set on this airduct, also can not be provided with.Air return system between drying grate head and the tail comprises the airduct that is communicated with blasting drying period, down-draft drying zone and preheating II section, is arranged on a multi-tube dust cleaner and a heat resisting exhauster in this airduct, a multi-tube dust cleaner can be joined a heavy fly-ash separator again in this air return system, and the branch road that enters blasting drying period of the airduct of this air return system is provided with converts cold blast valve.The outlet system of air of drying grate comprise the waste gas outlet that is communicated with blasting drying period, down-draft drying zone and preheating I section and chimney airduct, be arranged on an electric precipitator and a main exhauster in the airduct.
The green-ball of making carries out drying and forewarm by cloth system cloth on 1 drying grate, carry out fixed and roasting in 1 rotary kiln, cools off on 1 central cooler.From 950 ℃~1100 ℃ the high-temperature hot-air that one cold section of central cooler returns, to kiln hood, promptly do the incendiary secondary air by the rotary kiln head-shield, increase the kiln tail again and return to the oxygen level of drying grate preheating section, improve the degree of oxidation of pelletizing.About 500 ℃ the hot blast that returns from secondary cooling zone passes through backheat wind system (multi-tube dust cleaner and heat resisting exhauster) to drying grate preheating I section, further makes the green-ball drying and dehydrating.Simultaneously about 350 ℃ hot blast returning of drying grate preheating section bellows through multi-tube dust cleaner and heat resisting exhauster to drying grate down-draft drying zone top petticoat pipe and forced air drying pars infrasegmentalis petticoat pipe, cracking temperature of green pellet according to the pelletizing test, add cold wind to regulate the temperature of forced air drying by converting cold blast valve, the waste gas that comes out enters atmosphere through dedusting, main exhauster, chimney.

Claims (6)

1. technology wind system of producing the grate kiln-central cooler of acid pellet, it is characterized in that: comprise a multi-tube dust cleaner, heat resisting exhauster, electric precipitator, main exhauster and multistage airduct, a described multi-tube dust cleaner, heat resisting exhauster are concatenated into air return system between the drying grate head and the tail by airduct, a described electric precipitator and main exhauster are concatenated into the outlet system of air of drying grate by airduct, are provided with air return system between drying grate and central cooler.
2. the technology wind system of the grate kiln-central cooler of production acid pellet according to claim 1 is characterized in that: the air return system between described drying grate head and the tail also comprises a gravitational precipitator that is connected in series mutually with described multi-tube dust cleaner.
3. the technology wind system of the grate kiln-central cooler of production acid pellet according to claim 1 and 2, it is characterized in that: described drying grate is a three stage structure, comprise dry I section, dry II section and preheating section, air return system between described drying grate and central cooler is communicated with the dry II section of drying grate and the secondary cooling zone of central cooler, air return system between the drying grate head and the tail is communicated with preheating section and dry I section, and the outlet system of air of drying grate is communicated with the waste gas outlet and the chimney of dry I section and dry II section.
4. the technology wind system of the grate kiln-central cooler of production acid pellet according to claim 1 and 2, it is characterized in that: described drying grate is the four-part form structure, comprise blasting drying period, down-draft drying zone, preheating I section and preheating II section, air return system between described drying grate and central cooler is communicated with the preheating I section of drying grate and the secondary cooling zone of central cooler, and the outlet system of air of drying grate is communicated with the waste gas outlet and the chimney of blasting drying period, down-draft drying zone and preheating I section.
5. the technology wind system of the grate kiln-central cooler of production acid pellet according to claim 4 is characterized in that: the air return system between described drying grate head and the tail is provided with the branch road towards blasting drying period, and this branch road is provided with converts cold blast valve.
6. the technology wind system of the grate kiln-central cooler of production acid pellet according to claim 1 and 2 is characterized in that: be provided with a multi-tube dust cleaner and a heat resisting exhauster in the air return system between described drying grate and central cooler.
CNU2008200197594U 2008-04-14 2008-04-14 Process wind system of drying grate-rotary kiln-circular cooler for producing acid pellet Expired - Fee Related CN201172676Y (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101650127B (en) * 2009-06-26 2011-01-05 中冶长天国际工程有限责任公司 Blast device, grate and pellet preparation device
CN102121786A (en) * 2011-03-08 2011-07-13 中冶北方工程技术有限公司 Hot air system of grate-rotary kiln-circular cooler
CN102296175A (en) * 2011-09-16 2011-12-28 山东瑞拓球团工程技术有限公司 Method for producing oxidized pellets by using gold ore tailing and limonite
CN101650126B (en) * 2009-06-26 2012-06-06 中冶长天国际工程有限责任公司 Grate, pellet preparation device and green pellet preheating method
CN102586592A (en) * 2012-03-28 2012-07-18 柳州钢铁股份有限公司 Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation
CN103322818A (en) * 2013-05-29 2013-09-25 中信重工机械股份有限公司 Cement clinker cooling system and method
CN104913652A (en) * 2015-05-20 2015-09-16 中南大学 Shaft furnace pellet clinker waste heat recycling method and device
CN105441670A (en) * 2015-11-25 2016-03-30 北京首钢国际工程技术有限公司 Technology for producing high-proportion hematite pellets through chain-loop-ring system
CN106288803A (en) * 2015-06-12 2017-01-04 中冶长天国际工程有限责任公司 The bellows distribution method of drying grate and device
CN107300327A (en) * 2017-07-05 2017-10-27 鞍钢集团矿业有限公司 A kind of drying and preheating new method of pelletizing production
CN109373767A (en) * 2018-09-27 2019-02-22 中冶长天国际工程有限责任公司 A kind of ultralow NO of pelletizing flue gasxThe production technology and system of discharge

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101650127B (en) * 2009-06-26 2011-01-05 中冶长天国际工程有限责任公司 Blast device, grate and pellet preparation device
CN101650126B (en) * 2009-06-26 2012-06-06 中冶长天国际工程有限责任公司 Grate, pellet preparation device and green pellet preheating method
CN102121786A (en) * 2011-03-08 2011-07-13 中冶北方工程技术有限公司 Hot air system of grate-rotary kiln-circular cooler
CN102296175A (en) * 2011-09-16 2011-12-28 山东瑞拓球团工程技术有限公司 Method for producing oxidized pellets by using gold ore tailing and limonite
CN102296175B (en) * 2011-09-16 2012-10-03 山东瑞拓球团工程技术有限公司 Method for producing oxidized pellets by using gold ore tailing and limonite
CN102586592A (en) * 2012-03-28 2012-07-18 柳州钢铁股份有限公司 Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation
CN102586592B (en) * 2012-03-28 2013-09-25 柳州钢铁股份有限公司 Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation
CN103322818A (en) * 2013-05-29 2013-09-25 中信重工机械股份有限公司 Cement clinker cooling system and method
CN104913652A (en) * 2015-05-20 2015-09-16 中南大学 Shaft furnace pellet clinker waste heat recycling method and device
CN104913652B (en) * 2015-05-20 2016-11-30 中南大学 A kind of method of Shaft Furnace Pelletizing Process grog waste heat recovery and device thereof
CN106288803A (en) * 2015-06-12 2017-01-04 中冶长天国际工程有限责任公司 The bellows distribution method of drying grate and device
CN106288803B (en) * 2015-06-12 2018-10-19 中冶长天国际工程有限责任公司 The bellows distribution method and device of drying grate
CN105441670A (en) * 2015-11-25 2016-03-30 北京首钢国际工程技术有限公司 Technology for producing high-proportion hematite pellets through chain-loop-ring system
CN107300327A (en) * 2017-07-05 2017-10-27 鞍钢集团矿业有限公司 A kind of drying and preheating new method of pelletizing production
CN109373767A (en) * 2018-09-27 2019-02-22 中冶长天国际工程有限责任公司 A kind of ultralow NO of pelletizing flue gasxThe production technology and system of discharge

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