CN104119006B - A kind of lime shaft kiln of built-in combustion room - Google Patents

A kind of lime shaft kiln of built-in combustion room Download PDF

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Publication number
CN104119006B
CN104119006B CN201410316012.5A CN201410316012A CN104119006B CN 104119006 B CN104119006 B CN 104119006B CN 201410316012 A CN201410316012 A CN 201410316012A CN 104119006 B CN104119006 B CN 104119006B
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carbon dioxide
entrance
air
kiln
built
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CN104119006A (en
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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 present invention relates to a kind of lime shaft kiln of built-in combustion room, comprise waste heat boiler, carbon dioxide treatment unit, power generation assembly, feeder apparatus, air feed system and fuel feed system.The preheating zone of kiln body is provided with suction bar, and the top of cooling zone is provided with lower suction bar.Calcining zone is provided with combustion chamber, and one of combustion chamber is provided with burner, and other end is communicated with waste heat boiler.Burner is provided with coal powder entrance, First air entrance and secondary air entrance, First air entrance with gas blower or/and oxygen pipeline is connected.The outlet of upper suction bar is connected with carbon dioxide treatment unit by induced draft fan, and the outlet of lower suction bar is connected to secondary air entrance or induced draft fan entrance, and cooling blower entrance is connected with carbon dioxide treatment unit or is communicated with air.The present invention adds the material in heating kiln body by heat conduction brick structures muffle, improve the quality of calcination product, reclaims high-pureness carbon dioxide, utilizes waste-heat power generation, make full use of heat resource, improves limestone kiln overall economic efficiency.

Description

A kind of lime shaft kiln of built-in combustion room
Technical field
The invention belongs to industrial furnace technical field, relate to a kind of lime shaft kiln of built-in combustion room.
Background technology
Lime kiln afterheat is recycled, can save energy consumption, reduces lime production cost, reduces the discharge of pollutent simultaneously.Limestone kiln is large-scale high energy consuming devices, and along with the fast development of national economy, the waste heat of industrial furnace is very abundant, availablely has a high potential.The industry of Iron And Steel Industry, calcium carbide, aluminum oxide industry and refractory industry are lime consumption rich anies influential family, and the quick growth of above-mentioned industry, has driven the high speed development in limestone kiln.In process of production, smog discharge temperature is high for large-scale active lime production line, is about 240 ~ 260 DEG C.This part fume afterheat is effectively utilized, can energy dissipation be reduced, increase economy and the feature of environmental protection in limestone kiln.Decomposition of limestone produce carbonic acid gas be precious resources, due to decompose carbonic acid gas and combustion product gases mix, be unfavorable for recovery and the utilization of carbonic acid gas.
The applicant is that openly " equipment that a kind of low temperature heat of lime kiln is recycled mainly comprises limestone kiln, working medium storage tank, working medium preheater, vapour generator, steam setting device, steam turbine, generator, transmitter and condenser in the application for a patent for invention of CN102338565A at publication number.By the cryogenic gas in working medium preheater limestone kiln by working medium preheating, by vapour generator thermal oil liberated heat, the working medium after preheating is converted into steam, recycling steam turbine drives electrical power generators, the electricity produced can be used for and uses to lime kiln device electrical equipment, also can be incorporated to the total net of electric power ".The present invention is the improvement in above-mentioned patented technology.
Summary of the invention
The object of this invention is to provide a kind of lime shaft kiln of built-in combustion room, adopt the outer hot mode calcined limestone of external combustion, combustion chamber and decomposition of limestone room are separated, be beneficial to the cogeneration of collecting highly purified carbonic acid gas He utilizing combustion product gases, reduce the energy expenditure in limestone kiln, improve limestone kiln overall economic efficiency.
The lime shaft kiln of built-in combustion room of the present invention, comprises waste heat boiler, carbon dioxide treatment unit, power generation assembly, kiln body, induced draft fan, cooling blower, feeder apparatus, air feed system and fuel feed system.Kiln body is provided with opening for feed, discharge port and cooling air inlet, and cooling blower is connected to cooling air inlet.Be divided into preheating zone, calcining zone and cooling zone in kiln body, preheating zone is provided with suction bar, and cooling zone is provided with lower suction bar.Calcining zone is provided with combustion chamber, and the quantity of combustion chamber is determined according to the scale of lime shaft kiln.One of combustion chamber is provided with burner, and other end is communicated with waste heat boiler.Burner is provided with coal powder entrance, First air entrance and secondary air entrance, First air entrance with gas blower or/and oxygen pipeline is connected.Waste heat boiler is provided with steam coils, and steam coils is connected to power generation assembly, and the bottom of waste heat boiler is provided with molten slag bath, and molten slag bath is provided with slag notch.The outlet of upper suction bar is connected with carbon dioxide treatment unit by induced draft fan, and the outlet of lower suction bar is connected to secondary air entrance or induced draft fan entrance, and cooling blower entrance is connected with carbon dioxide treatment unit or is communicated with air.
Carbon dioxide treatment unit comprises purifying carbon dioxide equipment, carbonic acid gas cooling apparatus and carbon dioxide storage tank, and connects successively.First air entrance is that tangential way is connected with burner.Waste heat boiler is provided with venting port, and venting port is connected with exhaust emission system or carbon dioxide treatment unit.The top of combustion chamber is provided with cone, and the wall of combustion chamber and cone are built by laying bricks or stones by heat conduction brick structures and to be formed or metallic substance is made, and said metal material comprises cast iron, cast steel or high temperature steel.Power generation assembly comprises steam turbine and generating set, and steam coils is connected with steam turbine, and steam turbine is connected with generating set.
The combustion-supporting gas of combustion chambers burn is air, oxygen-rich air or oxygen, if oxygen makes combustion-supporting gas firing, burning after produce flue gas through venting port to carbon dioxide treatment unit.If air, oxygen-rich air make combustion-supporting gas firing, burning after produce flue gas through venting port to exhaust emission system.The cooling air of cool lime selects air or carbonic acid gas, if make cooling air with air, cooled high temperature air enters combustion chamber through lower suction bar and secondary air entrance and makes secondary combustion-supporting wind.If make cooling gas with carbonic acid gas, cooled gas through lower suction bar and induced draft fan to the recycle of carbon dioxide treatment unit.
Shaft furnace for the production of lime, coal carbonization and coking, the dry-distillation incineration of rubbish, the calcining of pelletizing or reduction iron production, the blue charcoal of coal carbonization production high-quality and can be used as the blue charcoal tail gas of high-quality of raw material of LNG.
The lime shaft kiln of built-in combustion room of the present invention adds the material in heating kiln body by heat conduction brick structures muffle, be conducive to the quality improving calcination product, reclaim high-pureness carbon dioxide.The flue gas of combustion chamber enters waste heat boiler, and steam driven electric power generation occurs, and improves thermo-efficiency, makes full use of heat resource.High-temperature gas after cooling zone cool lime product enters combustion chamber and makes secondary combustion-supporting wind, is conducive to the temperature improving combustion air, reduces the energy expenditure in limestone kiln.Adopt the outer hot mode calcined limestone of external combustion, combustion chamber and decomposition of limestone room are separated, be beneficial to collect high-pureness carbon dioxide and high-temperature waste flue gas cogeneration respectively, not only reduce the energy consumption in limestone kiln, and this valuable industrial chemicals of high-purity carbon dioxide can be obtained, improve limestone kiln overall economic efficiency.The carbonic acid gas produced after doing combustion-supporting gas burning with pure oxygen reclaims carbonic acid gas by carbon dioxide treatment unit, and the medium circulation making cool lime with carbonic acid gas utilizes, and is conducive to reducing exhaust gas emission, environment protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lime shaft kiln of built-in combustion room of the present invention;
Fig. 2 is that the A of Fig. 1 is to figure;
Fig. 3 is the structural representation of another program of the present invention;
Fig. 4 is that the B of Fig. 3 is to figure.
Wherein:
1-opening for feed, 2-upper suction bar, 3-kiln body, 4-cone, 5-combustion chamber, 6-burner, 7-lower suction bar, 8-cooling air inlet, 9-discharge port, 10-induced draft fan, 11-preheating zone, 12-calcining zone, 13-cooling zone, 14-cooling blower, 15-purifying carbon dioxide equipment, 16-carbonic acid gas cooling apparatus, 17-carbon dioxide storage tank, 18-First air entrance, 19-coal powder entrance, 20-secondary air entrance, 21-slag notch, 22-molten slag bath, 23-steam coils, 24-waste heat boiler, 25-carbonic acid gas induced draft fan.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Embodiment 1
The lime shaft kiln of built-in combustion room of the present invention, as shown in Figure 1 and Figure 2, comprise waste heat boiler 24, carbon dioxide treatment unit, power generation assembly, kiln body 3, induced draft fan 10, cooling blower 14, feeder apparatus, air feed system and fuel feed system, kiln body is provided with opening for feed 1, discharge port 9 and cooling air inlet 8, and cooling blower is connected to cooling air inlet.Be divided into preheating zone 11, calcining zone 12 and cooling zone 13 in kiln body, preheating zone is provided with suction bar 2, and the top of cooling zone is provided with lower suction bar 7.Power generation assembly comprises steam turbine and generating set, and steam turbine is coaxially connected with generating set.Carbon dioxide treatment unit comprises purifying carbon dioxide equipment 15, carbonic acid gas cooling apparatus 16 and carbon dioxide storage tank 17, and purifying carbon dioxide equipment, carbonic acid gas cooling apparatus are connected successively with carbon dioxide storage tank.Calcining zone is provided with 1 ~ 5 combustion chamber 5, and one of combustion chamber is provided with burner 6, and other end is communicated with waste heat boiler.The top of combustion chamber 5 is provided with cone 4, and the wall of combustion chamber and cone are built by laying bricks or stones by heat conduction brick structures and formed.Burner is provided with coal powder entrance 19, First air entrance 18 and secondary air entrance 20, and First air entrance is connected with oxygen pipeline, does First air with pure oxygen.First air entrance is that tangential way is connected with burner, and now secondary air entrance is closed state.Waste heat boiler is provided with steam coils 23 and venting port, and steam coils is connected to steam turbine, and the bottom of waste heat boiler is provided with molten slag bath, and molten slag bath is provided with slag notch.The outlet of upper suction bar is connected with carbon dioxide treatment unit by induced draft fan 10, and the outlet of lower suction bar is connected to induced draft fan entrance.Cooling blower entrance is connected with the carbon dioxide storage tank 17 of carbon dioxide treatment unit, makes cooling air with carbonic acid gas.The venting port of waste heat boiler is connected with carbon dioxide treatment unit.
The operation scheme of the lime shaft kiln of built-in combustion room of the present invention is, limestone material enters in the kiln body of shaft furnace through feeder apparatus, opening for feed 1, through preheating zone 11 preheating, goes downwards to calcining zone 12.To be burnt the material of heat muffle heating and calcining band produced by combustion chamber 5, Wingdale thermolysis is lime and carbonic acid gas, and carbonic acid gas upwards to run after the material of preheating preheating zone through upper suction bar 2 and induced draft fan 10 to carbon dioxide treatment unit.High-temperature lime runs down to cooling zone 13, and the cooling air bloated by cooling blower 14 enters cooling zone through cooling air inlet 8 and cools lime, and cooled lime is through discharge port 9 kiln discharge.Coal dust enters burner 6 through coal powder entrance 19, and the pure oxygen of oxygen pipeline enters burner 6 as First air through First air entrance and carries out combustion-supporting burning.Carbonic acid gas after cool lime enters carbon dioxide treatment unit through lower suction bar 7 and induced draft fan, and the venting port of waste heat boiler is also connected to carbon dioxide treatment unit.The slag of the molten state that combustion chambers burn produces enters molten slag bath 22, discharges after releasing heat through slag notch 21.The useless flue gas that burning produces enters waste heat boiler 24, by steam coils 23 heat-obtaining, utilizes the waste heat generation steam of flue gas, and steam driven steam turbine drive electrical generators generates electricity.Because the heating of Wingdale muffle is calcined, decomposition of limestone obtains fat lime and high temperature carbon dioxide decomposition gas, decomposition gas enters carbon dioxide treatment unit, store to carbon dioxide storage tank 17 after cooling through purifying carbon dioxide equipment 15 purifying and dedusting, carbonic acid gas cooling apparatus 16, the medium that a part of carbonic acid gas is used as cool lime circulates.
Embodiment 2
As shown in Figure 3, Figure 4, First air entrance 18 is connected with gas blower another embodiment of the present invention, makes combustion air with air.Cooling blower 14 entrance is communicated with air, makes lime cooling air with air.Upper suction bar 2 is exported and is connected with carbon dioxide treatment unit by induced draft fan 10, and the venting port of waste heat boiler is connected to exhaust emission system.The carbonic acid gas that decomposition of limestone produces and the carbonic acid gas that pure oxygen and fuel combustion produce together enter carbon dioxide treatment unit.The outlet of lower suction bar 7 is connected to secondary air entrance 20 by carbonic acid gas induced draft fan 25, makes the secondary combustion-supporting wind of combustion chambers burn with the high temperature air after cool lime.Other structure is identical with embodiment 1 with operation.

Claims (6)

1. the lime shaft kiln of a built-in combustion room, comprise waste heat boiler (24), carbon dioxide treatment unit, power generation assembly, kiln body (3), induced draft fan (10), cooling blower (14), feeder apparatus, air feed system and fuel feed system, kiln body is provided with opening for feed (1), discharge port (9) and cooling air inlet (8), and cooling blower is connected to cooling air inlet; Be divided into preheating zone (11), calcining zone (12) and cooling zone (13) in kiln body, preheating zone is provided with suction bar (2), and cooling zone is provided with lower suction bar (7); It is characterized in that: described calcining zone is provided with combustion chamber (5), one of combustion chamber is provided with burner (6), and other end is communicated with waste heat boiler; Described burner is provided with coal powder entrance (19), First air entrance (18) and secondary air entrance (20), described First air entrance with gas blower or/and oxygen pipeline is connected; Described waste heat boiler is provided with steam coils (23), and steam coils is connected to power generation assembly, and the bottom of waste heat boiler is provided with molten slag bath (22), and molten slag bath is provided with slag notch (21); The outlet of described upper suction bar is connected with carbon dioxide treatment unit by induced draft fan (10), and the outlet of described lower suction bar is connected to secondary air entrance or induced draft fan entrance, and described cooling blower entrance is connected with carbon dioxide treatment unit or is communicated with air.
2. the lime shaft kiln of built-in combustion room according to claim 1, is characterized in that: described carbon dioxide treatment unit comprises purifying carbon dioxide equipment (15), carbonic acid gas cooling apparatus (16) and carbon dioxide storage tank (17), and connects successively.
3. the lime shaft kiln of built-in combustion room according to claim 1, is characterized in that: described First air entrance (18) is connected with burner (6) for tangential way.
4. the lime shaft kiln of built-in combustion room according to claim 1, is characterized in that: described waste heat boiler (24) is provided with venting port, and described venting port is connected with exhaust emission system or carbon dioxide treatment unit.
5. the lime shaft kiln of built-in combustion room according to claim 1, it is characterized in that: the top of described combustion chamber (5) is provided with cone (4), the wall of combustion chamber and cone are built by laying bricks or stones by heat conduction brick structures and to be formed or metallic substance is made, and described metallic substance comprises cast iron, cast steel or high temperature steel.
6. the lime shaft kiln of built-in combustion room according to claim 1, is characterized in that: described power generation assembly comprises steam turbine and generating set, steam coils (23) is connected with steam turbine, and steam turbine is connected with generating set.
CN201410316012.5A 2014-07-04 2014-07-04 A kind of lime shaft kiln of built-in combustion room Active CN104119006B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104891831B (en) * 2015-06-28 2017-03-22 刘树钢 Energy-saving environment-friendly active lime roasting shaft kiln

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101323505A (en) * 2007-06-11 2008-12-17 余经炎 Direct combustion type lime carbonate calcination method
DE102009014026A1 (en) * 2008-12-03 2010-06-10 Ernest Stangl Method for generating thermal energy as e.g. electrical energy, in distributed power plant, involves burning fuel in container in heat- or power plant using oxygen source, and supplying carbon dioxide and oxygen mixture for burning fuel
CN102338565B (en) * 2011-07-22 2013-05-15 石家庄新华能源环保科技股份有限公司 Equipment for recycling low-temperature heat of lime kiln
CN102951859B (en) * 2012-10-24 2014-08-06 石家庄新华能源环保科技股份有限公司 Heat accumulating type lime kiln
CN204022688U (en) * 2014-07-04 2014-12-17 石家庄新华能源环保科技股份有限公司 The lime shaft kiln of a kind of built-in combustion chamber

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