CN102786235B - Active lime predecomposition furnace apparatus - Google Patents
Active lime predecomposition furnace apparatus Download PDFInfo
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- CN102786235B CN102786235B CN201210255546.2A CN201210255546A CN102786235B CN 102786235 B CN102786235 B CN 102786235B CN 201210255546 A CN201210255546 A CN 201210255546A CN 102786235 B CN102786235 B CN 102786235B
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Abstract
The invention discloses an active lime decomposition furnace apparatus which is used for preheating and predecomposition of the raw material limestone before limestone enters into a rotary kiln for calcination. The active lime decomposition furnace apparatus comprises a furnace body; a combustion chamber, heat exchanging zones and limestone stay zones are arranged inside the furnace body; the bottom of the furnace body is provided with a gas material channel; the combustion chamber is arranged in the furnace body and located above the gas material channel; the mutually independent heat exchanging zones are uniformly arranged around the periphery in the furnace body, and the top of each heat exchanging zone is provided with a flue gas outlet which enables the outside environment to be communicated with the interior of the furnace body; corresponding mixed flue gas channels are respectively provided between the heat exchanging zones at the periphery and the combustion chamber and enable the combustion chamber to be communicated with the heat exchanging zones; and the limestone stay zones are arranged below the heat exchanging zones, and an outer side wall of the limestone stay zone is provided with a pusher device. The active lime decomposition furnace apparatus provided by the invention can substantially improve heat exchange efficiency of an active lime calcining system and reduce a heat rate of the system.
Description
Technical field
The present invention relates to a kind of active lime calciner plant, be specifically related to a kind of active lime predecomposition furnace device, for the preheating of active lime calcination system and the predecomposition active lime of rotary kiln.
Background technology
At present, rotary kiln active lime calcination system with shaft preheater is high with its output, active lime calcination quality is good and stable, can calcine the advantage such as lime stone of the little grade of 10～40mm, is widely used in the industries such as steel-making, magnesium smelting, calcium carbide, papermaking.Shaft preheater can only be preheating to lime stone 900 ℃ of left and right in this system, and by the predecomposition to 20% of lime stone～25%, and the decomposition of 75%～80% lime stone enters in rotary kiln and completes.Because the limestone calcination in rotary kiln is mainly the radiation heat transfer that the thermal efficiency is not high, the surface radiating of cylinder of rotary kiln is excessive, causes system energy consumption to increase.And the preheating device of rotary kiln active lime calcination system is mainly take heat convection as main, lime stone and flue gas contact gear ratio surface area are large, and heat exchange efficiency is high, but flue gas is relatively large by the resistance of lime stone.Therefore, how to avoid the hear rate in active lime calcination process high, the resistance of flue gas to lime stone while reducing heat exchange, is problem demanding prompt solution in prior art.
Summary of the invention
In order to solve problems of the prior art, the object of this invention is to provide a kind of active lime predecomposition furnace device, can greatly improve the heat exchange efficiency in active lime calcination system, reduce system hear rate.
In order to realize foregoing invention object, the present invention adopts following technical scheme:
A kind of active lime predecomposition furnace device, enter preheating and the predecomposition before calcined by rotary kiln for lime stone raw material, comprise body of heater, body of heater inside is provided with combustion chamber, heat exchange zone and lime stone stacking area, the bottom of body of heater offers gas material passage, in body of heater and be positioned at gas material passage above be provided with combustion chamber, the uniform independently heat exchange zone that is provided with each other of surrounding in body of heater, the top of heat exchange zone is provided with the exhanst gas outlet that is communicated with extraneous and body of heater inside; Between the heat exchange zone of surrounding and combustion chamber, be respectively arranged with corresponding mixed flue gas passage, mixed flue gas passage is used for being communicated with combustion chamber and heat exchange zone, under heat exchange zone, be provided with lime stone stacking area, on the lateral wall of lime stone stacking area, be provided with push rod device.
For implementing better the present invention, the top of described heat exchange zone is also provided with charging aperture.
Owing to adopting technique scheme, the present invention has following superiority:
1, simple in structure, in the high-temperature flue gas producing in predecomposition furnace of the present invention and rotary kiln, flue gas is first in the mixed flue gas passage in body of heater, to mix, and then lime stone is carried out to preheating.With respect to first preheating lime stone respectively of above-mentioned two kinds of flue gases, after mix again common preheating lime stone version, when this structure can guarantee the high predecomposition rate of predecomposition furnace sodalime stone, structure is more simple.
2, the resistance of mixed flue gas does not significantly increase, the flue gas producing in the rotary kiln mixing in mixed flue gas passage in body of heater and the high-temperature flue gas producing after the combust fuel of the combustion chamber of body of heater inside significantly do not improve by the height of the bed of material of lime stone, and therefore the mobile resistance of mixed flue gas does not significantly increase.Therefore predecomposition furnace device of the present invention is not the reduction that significantly increases flow of flue gas resistance and exchange for system hear rate, but by the structural change of predecomposition furnace device is reduced to system hear rate.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
In figure: 1-gas material passage; 2-combustion chamber; 3-mixed flue gas passage; 4-heat exchange zone; 5-charging aperture; 6-exhanst gas outlet; 7-push rod device; 8-lime stone stacking area.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
In conjunction with Fig. 1, a kind of active lime predecomposition furnace device, enter preheating and the predecomposition before calcined by rotary kiln for lime stone raw material, comprise body of heater, body of heater inside is provided with combustion chamber 2, heat exchange zone 4 and lime stone stacking area 8, the bottom of body of heater offers gas material passage 1, in body of heater and be positioned at gas material passage 1 above be provided with combustion chamber 2, the uniform independently heat exchange zone 4 that is provided with each other of surrounding in body of heater, the top of heat exchange zone 4 is provided with the exhanst gas outlet 6 that is communicated with extraneous and body of heater inside; Between the heat exchange zone 4 of surrounding and combustion chamber 2, be respectively arranged with corresponding mixed flue gas passage 3, mixed flue gas passage 3 is for being communicated with combustion chamber 2 and heat exchange zone 4, under heat exchange zone 4, be provided with lime stone stacking area 8, on the lateral wall of lime stone stacking area 8, be provided with push rod device 7.The top of described heat exchange zone 4 is also provided with charging aperture 5.
The action principle of predecomposition furnace device of the present invention is: utilize the flue gas producing in the rotary kiln entering in body of heater and the high-temperature flue gas producing after 2 combust fuel of the combustion chamber of body of heater inside, two kinds of flue gases enter heat exchange zone 4 after the interior mixing of mixed flue gas passage 3, then carry out preliminary convective heat exchange with the lime stone raw material entering from charging aperture 5, mixed flue gas after heat exchange is discharged from exhanst gas outlet 6, lime stone raw material after preliminary heat exchange drops to lime stone stacking area 8 and does further preheating and predecomposition, lime stone is mainly heat conduction and the lime stone heat conduction from outside to inside itself between lime stone in the heat exchange form of stacking area, by the further heat exchange in lime stone stacking area, can make lime stone raw material self obtain sufficient preheating and predecomposition, finally by push rod device, the lime stone raw material after preheating and predecomposition is pushed to air inlet material passage and enters in rotary kiln and calcine via gas material passage.
The principal character that predecomposition furnace device of the present invention is different from traditional shaft preheater is:
1, this device band combuster itself is to heat is directly provided in predecomposition furnace, and it and the flue gas that enters from rotary kiln first mix, then jointly to lime stone preheating.The flue gas that the heat of tradition preheater all comes from rotary kiln is supplied with, and these flue-gas temperatures are not high especially.After the flue gas of supplying with in the flue gas of combustion chamber and rotary kiln mixes, flue-gas temperature significantly improves, and can significantly improve lime stone and enter the front temperature of rotary kiln and predecomposition rate;
2, in pre-heating cabin, there is lime stone not participate in and the dwell regions of flue gas heat exchange.Although lime stone is not participated in the heat exchange with flue gas in this section of region, it contributes to the expansion of limestone surfaces heat ecto-entad, and the temperature of lime stone core is improved, and is conducive to the calcining of lime stone.Mixed flue gas, not by this region, avoids increasing flue gas by the resistance of the bed of material simultaneously.
Claims (2)
1. an active lime predecomposition furnace device, enter preheating and the predecomposition before calcined by rotary kiln for lime stone raw material, comprise body of heater, it is characterized in that: body of heater inside is provided with combustion chamber (2), heat exchange zone (4) and lime stone stacking area (8), the bottom of body of heater offers gas material passage (1), in body of heater and be positioned at gas material passage above be provided with combustion chamber (2), the uniform independently heat exchange zone (4) that is provided with each other of surrounding in body of heater, the top of heat exchange zone is provided with the exhanst gas outlet (6) that is communicated with extraneous and body of heater inside; Between the heat exchange zone (4) of surrounding and combustion chamber (2), be respectively arranged with corresponding mixed flue gas passage (3), and mixed flue gas passage (3) is and is horizontally disposed with, mixed flue gas passage is used for being communicated with combustion chamber and heat exchange zone, enter into after the flue gas producing in the rotary kiln in body of heater and the high-temperature flue gas producing after the combust fuel of the combustion chamber of body of heater inside are mixed in mixed flue gas passage and enter heat exchange zone, under heat exchange zone (4), be provided with lime stone stacking area (8), on the lateral wall of lime stone stacking area, be provided with push rod device (7).
2. active lime predecomposition furnace device according to claim 1, is characterized in that: the top of heat exchange zone (4) is also provided with charging aperture (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210255546.2A CN102786235B (en) | 2012-07-24 | 2012-07-24 | Active lime predecomposition furnace apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210255546.2A CN102786235B (en) | 2012-07-24 | 2012-07-24 | Active lime predecomposition furnace apparatus |
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| Publication Number | Publication Date |
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| CN102786235A CN102786235A (en) | 2012-11-21 |
| CN102786235B true CN102786235B (en) | 2014-05-28 |
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| CN201210255546.2A Active CN102786235B (en) | 2012-07-24 | 2012-07-24 | Active lime predecomposition furnace apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1172156C (en) * | 2000-07-25 | 2004-10-20 | 宝山钢铁股份有限公司 | Preheating heater |
| CN201034313Y (en) * | 2007-04-04 | 2008-03-12 | 长葛市天润有色金属研究所 | Air and fuel double-preheating exchange type combustion furnace |
| CN201106926Y (en) * | 2007-08-29 | 2008-08-27 | 鞍钢集团设计研究院 | Apparatus for preheating hot-air furnace |
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