CN104496207A - Heat accumulating type lime rotary kiln - Google Patents

Heat accumulating type lime rotary kiln Download PDF

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Publication number
CN104496207A
CN104496207A CN201410750043.1A CN201410750043A CN104496207A CN 104496207 A CN104496207 A CN 104496207A CN 201410750043 A CN201410750043 A CN 201410750043A CN 104496207 A CN104496207 A CN 104496207A
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China
Prior art keywords
rotary kiln
kiln
thorax
gas
heat storage
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CN201410750043.1A
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CN104496207B (en
Inventor
贾会平
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/40Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

Abstract

The invention relates to a heat accumulating type lime rotary kiln. The heat accumulating type lime rotary kiln comprises two rotary kilns, a cooler, a cooling fan, a charging device, an air blower and a waste gas emitting system, wherein the charging device comprises a charger, a charging trolley and a material pit; each rotary kiln comprises a kiln head and a kiln tail cover; the cooling fan is connected with the cooler; the cooler is connected with the rotary kilns via the kiln tail covers; each kiln head is provided with a nozzle and an auxiliary nozzle; each rotary kiln is provided with a pre-forger or a heat accumulating type pre-heater, the upper part of which is connected with the charging device, and the lower part of which is connected with the corresponding rotary kiln via each kiln head; the upper part of each pre-forger or each heat accumulating type pre-heater is provided with a gas inlet and outlet which is connected with the air blower via a No.1 three-way valve and is connected with the waste gas emitting system via a No.2 three-way valve. According to the invention, the heat accumulating type pre-heaters or the pre-forgers are arranged for preheating auxiliary combustion air; residual heat is utilized fully, and the production cost is reduced; dividing walls are used for heating and forging lime, so that high-purity carbon dioxide can be collected, and resources are utilized fully.

Description

Heat storage type lime rotary kiln
Technical field
The invention belongs to chemical materials production unit technical field, relate to a kind of rotary kiln, be specifically related to a kind of Heat storage type lime rotary kiln.
Background technology
Rotary kiln refers to rotary calcining kiln, belongs to production of construction materials kind equipment.Rotary kiln can be divided into cement kiln, chemical metallurgy kiln and limestone kiln by material handling difference.Cement kiln is mainly used in calcination of cement clinker, point dry production cement kiln and the large class of wet production cement kiln two.Chemical metallurgy kiln is then mainly used in the poor iron ore magnetic roasting of metallurgy industry Steel Plant.Lime rotary kiln uses the kiln calcining small particles material more widely, be applicable to being applied to iron and steel, calcium carbide, nonferrous production enterprise, can the fine fraction raw material limestone of dinectly bruning 10-40mm or rhombspar, there is the features such as adaptability to raw material is good, output is large, product is even, activity degree is high, production operation is stable.
The flue gas that in rotary kiln, fuel combustion produces is through calcining materials from kiln thorax, and the objectionable impurities in fuel is attached on calcined material, and the dust produced that simultaneously burns drops on material, affects the quality of calcination product.Together with the carbon dioxide mix that flue gas in addition after burning and decomposition of limestone produce, be unfavorable for recovery and the utilization of limestone calcination byproduct carbonic acid gas.Publication number is that open " one can reclaim CO to the Chinese invention patent application of CN 102786234 A 2u-shaped internal combustion rotary lime kiln, principal feature is that rotary kiln body is horizontal, U-shaped muffle process furnace and U-shaped are calcined the alternate neighbour in chamber and are arranged in rotary kiln body, on muffle process furnace inwall and on calcining cavity wall, be laid with blade, be also communicated with calcining chamber and charging limestone mouth be provided with Carbon dioxide collector, compared with existing muffle rotary lime kiln, have rational in infrastructure, energy-saving and emission-reduction, recycle, the remarkable advantages such as quality product raising ".But the rotary kiln of the non-above-mentioned large-scale production of this internal combustion rotary lime kiln, can not make full use of fume afterheat, reduce energy consumption and make full use of resource.
Summary of the invention
The object of this invention is to provide a kind of Heat storage type lime rotary kiln, by warm-up combustion-supporting air, the waste heat making full use of lime production, reduce energy consumption and production costs.By partition heating and calcining Wingdale, fuel combustion and decomposition of limestone are carried out in different spaces, is beneficial to collect highly purified carbonic acid gas, reduce the energy expenditure of rotary kiln, improve thermo-efficiency, make full use of resource.
Technical scheme of the present invention is: Heat storage type lime rotary kiln, comprises two rotary kilns, water cooler, cooling blower, charging equipment, gas blower and exhaust emission systems.Charging equipment comprises feeder, feeding cart and material hole.Rotary kiln is provided with kiln hood and kiln hood, and cooling blower is connected with water cooler, and water cooler is connected with rotary kiln by kiln hood, and kiln hood is provided with burner or auxiliary burning nozzle.Rotary kiln is provided with precalciner or heat accumulation type preheater, and the top of precalciner or heat accumulation type preheater is connected with charging equipment, and bottom is connected with rotary kiln by kiln hood.The top of calcinatory or heat accumulation type preheater is provided with gas inlet and outlet, and gas inlet and outlet is connected with gas blower by No. 1 T-valve, is connected with exhaust emission system by No. 2 T-valve.
Rotary kiln is dividing wall type structure, and the rotary kiln of dividing wall structure is made up of inner core and urceolus, and be kiln thorax in the middle of inner core, the annular space formed between inner core and urceolus is material thorax, and material thorax is provided with pillar stiffener.Dividing wall structure rotary kiln is provided with reinforced ring and discharging ring, and water cooler is provided with material channel and gas passage.Material thorax is connected with feeding-passage by reinforced ring, and be connected with water cooler with material channel by discharging ring, water cooler is connected with kiln thorax by gas passage.The filling tube be connected with reinforced ring is provided with decomposition gas and exports, and material thorax is connected with decomposition gas processing unit by decomposition gas outlet.
Be provided with material flight in reinforced ring, material flight is arranged on the inwall of reinforced ring, is positioned at the ingress of material falling hole.Annular materials thorax is provided with material baffle, and material baffle is arranged on the exit of material falling hole.Decomposition gas processing unit comprises purifying carbon dioxide device and carbon dioxide storage tank, and connects successively.Precalciner is provided with 5 ~ 30 insert burners, and the length of insert burner is 1 ~ 5 meter.The height of precalciner is 3 ~ 10m.Burner and auxiliary burning nozzle are geseous fuel burner, liquid fuel burner or solid fuel burner, or the combination of above-mentioned burner.Material can be Wingdale, rhombspar and coal.Rotary kiln is provided with pushing device.
Heat storage type lime rotary kiln of the present invention, by arranging heat accumulation type preheater or precalciner, makes full use of the waste heat warm-up combustion-supporting air of flue gas, reduces rotary kiln energy consumption and lime production cost.By partition heating and calcining Wingdale, fuel combustion and decomposition of limestone are carried out in different spaces, is beneficial to collect highly purified carbonic acid gas, reduce the energy expenditure of rotary kiln, improve thermo-efficiency, make full use of resource.
Accompanying drawing explanation
Fig. 1 is the structural representation of Heat storage type lime rotary kiln of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 be another embodiment of the present invention structural representation;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the structural representation of reinforced ring;
Fig. 6 is the structural representation of discharging ring.
Wherein:
1-exhaust emission system, 2-heat accumulation type preheater, 2a-the first heat accumulation type preheater, 2b-the second heat accumulation type preheater, 3-decomposition gas processing unit, 4-kiln hood, 5-gas passage, 6-water cooler, 7-cooling blower, 8-material channel, 9-rotary kiln, 9a-the first rotary kiln, 9b-the second rotary kiln, 10-material thorax, 11-pillar stiffener, 12-decomposition gas exports, 13-kiln thorax, 14-kiln hood, 15-burner, 16-support, 17-feeder, 18-feeding cart, 19-material hole, 20-discharging ring, 21-reinforced ring, 22-gas inlet and outlet, 23-No. 1 T-valve, 24-gas blower, 25-No. 2 T-valve, 26-material bed, 27-precalciner, 27a-the first precalciner, 27b-the second precalciner, 28-insert burner, 29-material flight, 30-material baffle, 31-material falling hole, 32-filling tube, 33-discharge port, 34-auxiliary burning nozzle.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.Scope is not limited to embodiment, and those skilled in the art make any change and also belong to the scope of protection of the invention in the scope that claim limits.
Embodiment 1
Heat storage type lime rotary kiln of the present invention as shown in Figure 1 and Figure 2, comprises two rotary kilns 9, water cooler 6, cooling blower 7, charging equipment, precalciner 27, gas blower 24 and exhaust emission system 1.Charging equipment comprises feeder 17, feeding cart 18 and material hole 19.Rotary kiln is provided with kiln hood 14 and kiln hood 4, and cooling blower is connected with water cooler, and water cooler is connected with rotary kiln by kiln hood, and kiln hood is provided with auxiliary burning nozzle 34, and auxiliary burning nozzle is geseous fuel burner.The top of precalciner or heat accumulation type preheater is connected with charging equipment, bottom is connected with rotary kiln by kiln hood, the top of calcinatory or heat accumulation type preheater is provided with gas inlet and outlet 22, gas inlet and outlet is connected with gas blower 24 by No. 1 T-valve 23, is connected with exhaust emission system by No. 2 T-valve 25.Precalciner is provided with 5 ~ 30 insert burners 28, and the length of insert burner is 2 meters.The height of precalciner is 6m.
The operating process of Heat storage type lime rotary kiln of the present invention is, limestone material enters precalciner 27 through charging equipment, drops to material bed 26, and insert burner 28 sprays fuel gas buring, the material in precalcining first precalciner.Material after precalcining enters the first rotary kiln 9a through kiln hood 14, and auxiliary burning nozzle ejection fuel continues calcined limestone.Lime after calcining is through kiln hood 4 to water cooler 6, and the cooling air that cooling blower bloats cools the lime in water cooler, and after cooling, lime is through discharging equipment kiln discharge, and the cooling air after cool lime is converged by the flue gas of kiln hood and the first rotary kiln.Material in flue gas after converging to the second rotary kiln 9b preheating second rotary kiln, flue gas is preheating lime stone material in kiln hood to the second precalciner 27b, and exothermic flue gas arrives exhaust emission system through gas inlet and outlet 22.The combustion air that same gas blower 24 bloats enters the first precalciner 27a through No. 1 T-valve 23 and carries out combustion-supporting burning, the flue gas produced enters the first rotary kiln 9a, after calcined limestone, flue gas and high temperature cooling wind one play the second rotary kiln 9b preheating material, then discharge to blowdown system through gas inlet and outlet 22 and No. 2 T-valve 25 after the raw material that the second precalciner 27b preheating has just entered.Then switch operation, the rotary kiln of both sides hockets and calcines or preheating, and realize switch operation by the action of No. 1 T-valve and No. 2 T-valve, the timed interval of commutation is 10 ~ 15 minutes, and the concrete timed interval is determined according to processing requirement.
Embodiment 2
Another embodiment of the present invention as shown in Figure 3, Figure 4, comprises two rotary kilns 9, water cooler 6, cooling blower 7, charging equipment, heat accumulation type preheater 2, gas blower 24 and exhaust emission system 1.Rotary kiln is dividing wall type structure, and the rotary kiln of dividing wall structure is made up of inner core and urceolus, and be kiln thorax 13 in the middle of inner core, the annular space formed between inner core and urceolus is material thorax 10, and material thorax is provided with pillar stiffener 11.The rotary kiln of dividing wall structure is provided with reinforced ring 21 and discharging ring 20.Rotary kiln is provided with kiln hood 14 and kiln hood 4, and cooling blower is connected with water cooler, and water cooler is connected with rotary kiln by kiln hood, and kiln hood is provided with burner 15, and burner is geseous fuel burner.Water cooler is provided with material channel 8 and gas passage 5.Material thorax is connected with feeding-passage by reinforced ring, and be connected with water cooler with material channel by discharging ring, water cooler is connected with kiln thorax by gas passage.The filling tube 32 be connected with reinforced ring is provided with decomposition gas and exports 12, and described material thorax is connected with decomposition gas processing unit 3 by decomposition gas outlet.
Decomposition gas processing unit 3 comprises purifying carbon dioxide device and carbon dioxide storage tank, and connects successively.As shown in Figure 5, be provided with material flight 29 in reinforced ring 21, material flight is arranged on the inwall of reinforced ring, is positioned at the ingress of material falling hole 31.Material thorax 10 is provided with material baffle 30, and material baffle is arranged on the exit of material falling hole.As shown in Figure 6, the outer shroud of rotary kiln is provided with material falling hole 31, and discharging ring is connected with water cooler by material channel.Other structure is identical with embodiment 1.
Present embodiment operating process be, limestone material enters the-heat accumulation type preheater 2a through charging equipment, the material thorax 10 of the first rotary kiln 9a is entered through reinforced ring 21, the material in burner ejection fuel combustion muffle heating and calcining first rotary kiln material thorax after smoke pre-heating.Lime after calcining arrives water cooler 6 through discharging ring 20 and material channel 8, the cooling air that cooling blower bloats cools the lime in water cooler, after cooling, lime is through discharging equipment kiln discharge, and the cooling air after cool lime converges through the flue gas of gas passage 5 and the first rotary kiln.Converge material in rear flue gas to the second rotary kiln 9b preheating second rotary kiln, flue gas is preheating lime stone material in kiln hood to the second heat accumulation type preheater 2b, and exothermic flue gas arrives exhaust emission system through gas inlet and outlet 22.The combustion air that same gas blower 24 bloats enters the-heat accumulation type preheater 2a through No. 1 T-valve 23 and carries out preheating, air after preheating is to the combustion-supporting burning of the first rotary kiln 9a, flue gas after muffle heating and calcining Wingdale and high temperature cooling wind one play the second rotary kiln 9b preheating material, again after the raw material that the second heat accumulation type preheater 2b preheating has just entered, discharge to blowdown system through gas inlet and outlet 22 and No. 2 T-valve 25.Then switch operation, the rotary kiln of both sides hockets and calcines or preheating, and realize switch operation by the action of No. 1 T-valve and No. 2 T-valve, the timed interval of commutation is 10 ~ 15 minutes, and the concrete timed interval is determined according to processing requirement.

Claims (8)

1. a Heat storage type lime rotary kiln, comprise two rotary kilns (9), water cooler (6), cooling blower (7), charging equipment, gas blower (24) and exhaust emission system (1), described charging equipment comprises feeder (17), feeding cart (18) and material hole (19); Described rotary kiln is provided with kiln hood (14) and kiln hood (4), described cooling blower is connected with water cooler, described water cooler is connected with rotary kiln by kiln hood, described kiln hood is provided with burner (15) or auxiliary burning nozzle (34), it is characterized in that: described rotary kiln is provided with precalciner (27) or heat accumulation type preheater (2), the top of described precalciner or heat accumulation type preheater is connected with charging equipment, and bottom is connected with rotary kiln by kiln hood; The top of described calcinatory or heat accumulation type preheater is provided with gas inlet and outlet (22), and described gas inlet and outlet is connected with gas blower (24) by No. 1 T-valve (23), is connected with exhaust emission system by No. 2 T-valve (25).
2. Heat storage type lime rotary kiln according to claim 1, it is characterized in that: described rotary kiln is dividing wall type structure, the rotary kiln of described dividing wall structure is made up of inner core and urceolus, be kiln thorax (13) in the middle of inner core, the annular space formed between inner core and urceolus is material thorax (10), and material thorax is provided with pillar stiffener (11); Described dividing wall structure rotary kiln is provided with reinforced ring (21) and discharging ring (20), and described water cooler is provided with material channel (8) and gas passage (5); Described material thorax is connected with feeding-passage by reinforced ring, and be connected with water cooler with material channel by discharging ring, described water cooler is connected with kiln thorax by gas passage; The filling tube (32) be connected with reinforced ring is provided with decomposition gas and exports (12), and described material thorax is connected with decomposition gas processing unit (3) by decomposition gas outlet (12).
3. Heat storage type lime rotary kiln according to claim 2, is characterized in that: be provided with material flight (29) in described reinforced ring (21), described material flight is arranged on the inwall of reinforced ring, is positioned at the ingress of material falling hole (31); Described annular materials thorax (10) is provided with material baffle (30), and described material baffle is arranged on the exit of material falling hole.
4. Heat storage type lime rotary kiln according to claim 2, is characterized in that: described decomposition gas processing unit (3) comprises purifying carbon dioxide device and carbon dioxide storage tank.
5. Heat storage type lime rotary kiln according to claim 1, is characterized in that: described precalciner (27) is provided with 5 ~ 30 insert burners (28), and the length of described insert burner is 1 ~ 5 meter.
6. Heat storage type lime rotary kiln according to claim 4, is characterized in that: the height of described precalciner (27) is 3 ~ 10m.
7. Heat storage type lime rotary kiln according to claim 1, is characterized in that: described burner (15) and auxiliary burning nozzle (34) are geseous fuel burner, liquid fuel burner or solid fuel burner, or the combination of above-mentioned burner.
8. Heat storage type lime rotary kiln according to claim 1, is characterized in that: described rotary kiln is provided with pushing device.
CN201410750043.1A 2014-12-10 2014-12-10 Heat storage type lime rotary kiln Active CN104496207B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105698524A (en) * 2016-02-17 2016-06-22 石家庄新华能源环保科技股份有限公司 Regenerative multistage heating rotary kiln device
JP2018513344A (en) * 2015-04-03 2018-05-24 シジアチュアン・シャンファ・エネルギー・エンバイロメンタル・テクノロジー・カンパニー・リミテッドShijiazhuang Xinhua Energy Environmental Technology Co., Ltd Partition wall rotary kiln equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03164453A (en) * 1989-11-22 1991-07-16 Sumitomo Metal Ind Ltd Production of quick lime for sintering raw material
CN103043936A (en) * 2012-12-17 2013-04-17 天津英康科技发展有限公司 Expanded perlite ore preheating furnace and working method thereof
CN103058536A (en) * 2012-11-26 2013-04-24 石家庄新华能源环保科技股份有限公司 Heat-accumulation dividing-wall heating rotary kiln device
CN203144295U (en) * 2013-03-09 2013-08-21 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating rotary lime kiln
CN104119003A (en) * 2014-07-04 2014-10-29 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating industrial furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03164453A (en) * 1989-11-22 1991-07-16 Sumitomo Metal Ind Ltd Production of quick lime for sintering raw material
CN103058536A (en) * 2012-11-26 2013-04-24 石家庄新华能源环保科技股份有限公司 Heat-accumulation dividing-wall heating rotary kiln device
CN103043936A (en) * 2012-12-17 2013-04-17 天津英康科技发展有限公司 Expanded perlite ore preheating furnace and working method thereof
CN203144295U (en) * 2013-03-09 2013-08-21 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating rotary lime kiln
CN104119003A (en) * 2014-07-04 2014-10-29 石家庄新华能源环保科技股份有限公司 Heat accumulating type dividing-wall heating industrial furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018513344A (en) * 2015-04-03 2018-05-24 シジアチュアン・シャンファ・エネルギー・エンバイロメンタル・テクノロジー・カンパニー・リミテッドShijiazhuang Xinhua Energy Environmental Technology Co., Ltd Partition wall rotary kiln equipment
CN105698524A (en) * 2016-02-17 2016-06-22 石家庄新华能源环保科技股份有限公司 Regenerative multistage heating rotary kiln device
CN105698524B (en) * 2016-02-17 2018-07-06 石家庄新华能源环保科技股份有限公司 Heat accumulating type multistage heating rotary kiln device

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