CN108675655A - A kind of lime kiln device using hot wind - Google Patents
A kind of lime kiln device using hot wind Download PDFInfo
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- CN108675655A CN108675655A CN201810686601.0A CN201810686601A CN108675655A CN 108675655 A CN108675655 A CN 108675655A CN 201810686601 A CN201810686601 A CN 201810686601A CN 108675655 A CN108675655 A CN 108675655A
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- Prior art keywords
- lime
- kiln
- hot wind
- kiln body
- burner
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
Abstract
The present invention relates to a kind of lime kiln device of hot wind calcining and the methods for producing lime using it, the hot wind calcined limestone that burner generates outside kiln is used when producing lime, for waste heat wind after calcining for being preheated to lime stone mineral aggregate, the waste heat wind discharge kiln body after preheating is used further to preheating gas and combustion air after dedusting.By the present invention in that with hot wind calcined limestone, lime quality can be significantly improved, lime yield rate is improved, improves productivity, limekiln proposed by the present invention does not configure buner system, burner apparatus of the hot wind of high-temperature calcination outside kiln, burner apparatus can utilize the blast furnace gas of low heat value to do fuel, hot wind can be the heat smoke that burner generates, thus is conducive to simplify kiln structure, reduces limekiln operating cost.
Description
Technical field
The present invention relates to a kind of limekiln that the hot wind inputted outside for fuel, using kiln using gas is calcined and utilizations
The limekiln produces the process of lime.
Background technology
Lime, that is, calcium oxide (CaO), is widely used in the works such as steel and iron industry, calcium carbide industry, aluminum oxide industry, refractory material
One of raw materials for production necessary to industry and these large-scale industry fields, such as in metallurgical industry, often produce 1 ton of steel
Just need about 70 kilograms of lime.The primary raw material for producing lime is lime stone, and lime stone main component is calcium carbonate
(CaCO3), the basic principle of lime calcining is exactly by high temperature, Decomposition of Calcium Carbonate in lime stone at calcium oxide and titanium dioxide
Carbon.
Fundamental reaction formula：CaCO3+ 42.5Kcal=CaO+CO2
Lime reparation technology process is broadly divided into preheating, calcining, cooling and unloads ash.Based on existing lime preparation technique
Process is：Lime stone and solid fuel are packed into limekiln, or while lime stone is packed into limekiln, gas is fired
Material, combustion air are sent into kiln body burning, the high-temperature flue gas that fuel generates after being mixed and burned with combustion air through pipeline and burner
For being heated, being calcined to lime stone；Lime stone is heated to 800 DEG C~850 DEG C and starts to decompose, and is forged to 1200 DEG C of completions
It burns, generates lime finished product；The lime of generation unloads after supercooling outside kiln discharge, that is, completes the production of quick lime product.Existing
In lime production technique, since combustion process is completed inside kiln body, negative pressure or micro-positive pressure can only be used inside kiln body,
Heat entrained by combustion flame and high-temperature flue gas is unevenly distributed and is difficult to control, and longer calcination time is needed just to can guarantee
Lime stone mineral aggregate inside kiln body all decomposes, and the productivity that this allows for limekiln is relatively low, and underburnt and burning rate are higher, institute
Meaning underburnt is exactly that the part calcium carbonate in mineral aggregate does not decompose, and so-called burning is exactly lime finished product and the pasc reaction in mineral aggregate impurity
Calcium silicates is generated, this can all seriously affect the quality of lime finished product, activity of lime is caused to reduce.
Existing limekiln is by fuel point：There is multifuel combustion kiln (i.e. to bake based on fluid fuel, including coke, coke powder, coal etc.)
With gas burning kiln (i.e. based on burn gas fuel, such as high coke mixed gas, coke-stove gas, coal gas of converter, calcium carbide tail gas, generation
Producer gas, natural gas etc.), wherein because lime quality is high, gas burning kiln application is more extensive；By kiln shape point：There are shaft furnace, revolution
Kiln, sleeve kiln, co-current heat accumulated kiln with double shafts (Maers Kiln, also referred to as mayer hereby kiln), Fu Kasi kilns (Italy) etc., wherein
Using being more widely annulus shaft furnace, Maers Kiln；By mode of operation point：Having negative-pressure operation kiln, (such as annulus is perpendicular
Kiln) and positive pressure (micro-positive pressure) operation kiln (such as co-current heat accumulated kiln with double shafts).
No matter the limekiln of any form, be by kiln body, feeding device, distribution device, burner, unload grey dress
It sets, the components composition such as electric appliance, instrument control device, dust-extraction unit, kiln body all includes preheating section, calcining section, cooling section.It is existing
The shared feature of limekiln technology, especially various gas burning kilns is to be required for configuration buner system, the burner system of gas burning kiln
It is made of multiple rows of, multigroup burner distribution as unified, is configured with gaseous fuel pipeline and comburent air duct, nozzle etc..
In order to illustrate more clearly of the popular feature of various forms of gas burning kiln technologies, below to apply commonplace ring
It is illustrated for shape sleeve shaft kiln, cocurrent regenerator kiln (Maers Kiln).
Such as attached drawing 1, annulus shaft furnace system includes：In 1- furnace bodies, 1a- cooling airs, 2- feeding systems, 3-1- are upper
Inner sleeve, 4- exhaust emission systems, 4a- wholes exhaust gas, 5- burners, 5a- combustion gas+burner under sleeve, 3-2- heat exchangers, 3-3
Air, 6- discharge systems；Have in furnace body 1：The preheating zones 1-1-, 1-2- burning zones, 1-3- cooling zones.
In the 1-1 of preheating zone, lime stone is heated to its calcination temperature.The heat of preheating zone 1-1 comes from burning zone 1-2
Flue gas, a part of flue gas that burning zone 1-2 is generated is upwardly into preheating zone 1-1, after being preheated to mineral aggregate cooling enter useless
Gas system 4；Another part exhaust gas with extra heat enters heat exchanger 3-2 by upper inner sleeve 3-1, is helped for heating
It is discharged through waste gas system 4 after firing air, the combustion air after being heated then is sent to burner 5 for burning by pipeline.
Calcination process is carried out in burning zone 1-2, and combustion gas and combustion air enter kiln body in burner 5 and burn after mixing,
Its high-temperature flue gas is used for limestone calcination, and lime finished product enters cooling zone 1-3 in the bottoms burning zone 1-2.
In cooling zone 1-3, the cold air 1a of hot lime and kiln bottom sucking carries out heat exchange, by going out after temperature reduction
Kiln body is discharged in material system 6.Cooling air 1a enters from the lower parts cooling zone 1-3 in kiln, in lower inner sleeve 3-3 with burner 5
A part of flue gas is mixed into high temperature off-air, burner 5 is discharged into from the tops lower inner sleeve 3-3, as combustion air
Participate in burning.
Compared with rotary kiln, double thorax kilns, the major technique advantage of annular lime kiln includes：The thermal efficiency is high, floor space is small,
Negative pressure operation etc..But the common problem of this type of furnace is that system complex, production capacity are relatively low, and single stove day production capacity maximum at present is difficult to surpass
600 tons are crossed, maintenance cost is higher, followed by lime quality stability problem, and it is even higher that underburnt burning rate is generally 3-5%.
Cocurrent regenerator kiln (Maers Kiln) is also at present using one of more extensive kiln type.There are two types of forms at present
Lime shaft kiln, i.e., single thorax are reverse-flow and more thorax parallel types limekiln (being usually pair kiln thorax).The cocurrent heat accumulating type limekiln of standard
It is the general structure shape using round double thoraxes by double bore type limekilns of burning kiln thorax and the non-combustible mutual switchover operation of firing thorax
Formula, centre are connected by channel, and i.e. rotation calcining is primary at regular intervals.While a kiln thorax is calcined, burn cigarette
Gas is flowed into another kiln thorax out of burning kiln thorax by the channel, is preheated to raw material limestone.This cocurrent accumulation of heat
Formula kiln furnitures have the advantages that the thermal efficiency is high, low energy consumption, the quality of lime product is higher, but because more a set of exchange system, equipment
It is more complicated and invest larger.Similarly, the yield rate of cocurrent regenerator kiln technology is not significantly improved.
The double thorax lime shaft kiln operation principle schematic diagrams of cocurrent regenerator kiln (Maers Kiln) such as attached drawing 2.Including：7- fires
Burn thorax, 7-1- burning wind, 7-2- burning zones, 7-3 cooling zones, 8- exhaust thoraxes, the preheating zones 8-1-, 8-2 exhaust gas, the channels 9-, 8-3
Cooling zone, 10- cooling winds.
It burns for formula limekiln, structure type and forges as described previously for the relatively extensive various forms of gas of application
Although burning form different from, technological process, capital equipment composition are substantially similar, and the feature of general character is all to use to be mounted on
Burner in kiln body carries out heating and calcining to mineral aggregate, and calcination time is longer, and equipment investment is big, operating cost is high, maintenance cost
Height, productivity is relatively low, it is difficult to eliminate " underburnt " or " burning " phenomenon.Although engineers and technicians have carried out many significant improvements,
But above-mentioned common problem is not solved still.
Invention content
For the above-mentioned prior art the problem of, the present invention provides a kind of using the limekiln for inputting hot wind outside kiln
Device, and the process of industrial lime is produced using the device, the device or method be using hot wind to mineral aggregate into
Row calcining, hot wind do not have flame, temperature to stablize, can obtain high-grade lime finished product, avoid burning situation, thermostatic hot-air
Effect be to completely eliminate " underburnt " and " burning ", shorten calcination time.
In order to achieve the above objectives, present invention employs following technical solutions：
A kind of lime kiln device using hot wind, including kiln body and burner are provided with calcining section in the kiln body, fire
It burns device and provides heat smoke as hot wind to being calcined in the lime stone mineral aggregate for calcining section, heat smoke cooling heel row goes out kiln body
For to burner combustion gas and combustion-supporting gas preheat.
The heat smoke that the burner provides is the heat smoke of set temperature.
Ranging from 800 DEG C -1250 DEG C of the set temperature.
Also there is kiln body preheating section, preheating section to be located at before calcining section, and hot wind is after completing to calcine to positioned at preheating section
Lime stone mineral aggregate is preheated, and cooling heel row goes out kiln body.
Also there is kiln body cooling section, cooling section to be located at after calcining section, and the lime stone finished product for calcining completion is cold through cooling section
But it is discharged from kiln body after.
Cooling section cools down lime stone finished product using air.
Also there is dust-extraction unit, heat smoke cooling heel row to go out kiln body after dust-extraction unit dedusting for the combustion to burner
Gas and combustion-supporting gas are preheated.
The kiln body is various vertical limekiln, or the rotary kiln for lime calcining.
The combustion gas is coal gas, and combustion-supporting gas is combustion air.
A method of lime is produced using hot wind, burner is set outside kiln body, the heat provided using burner
Flue gas calcines the lime stone mineral aggregate in kiln body as hot wind, and the heat smoke discharge kiln body after cooling is used after dust removal process
Combustion gas in preheated burning device and combustion-supporting gas.
The technique effect that the present invention has：
1) mineral aggregate is calcined using hot wind in the limekiln；Kiln body burner is eliminated, is inputted by burner
The heat smoke of kiln body calcines lime stone mineral aggregate, can be precisely controlled the temperature of hot wind to increase substantially heating efficiency,
To improve the burning quality of lime, is conducive to shorten calcination time, can significantly be carried in the case where not increasing kiln body volume
High production capacity.Inventor's experiments are conducted on this verification, it was demonstrated that with the hot wind calcined limestone of certain temperature, calcination time shortens
30-50% is more, and it is not reacted with impurity with lime finished product, lime finished product is caused to be lived to select rational calcination temperature
Property degree reduce premised on.
2) by accurately controlling the temperature of hot wind, it is possible to prevente effectively from burning, lime stone block is heated evenly, lime finished product
Rate improves, the finished activated degree of lime improves.
3) kiln body burner is eliminated, kiln structure is substantially simplified, system is more stablized, is reliable, convenient for safeguarding,
Reduce system maintenance cost；
4) blast furnace gas compared with low heat value is used as fuel, substantially instead of expensive coal gas of converter or coke
Producer gas or other exotic fuels, compared to present various limekiln technologies, limekiln fortune is greatly reduced in the present invention
Row cost.
Description of the drawings
The following further describes the present invention with reference to the drawings：
Fig. 1 is one of the prior art described in background technology structural schematic diagram；
Fig. 2 is two structural schematic diagrams of the prior art described in background technology；
Fig. 3 is the lime kiln device operation principle schematic diagram in the embodiment of the present invention；
Specific implementation mode
The invention will be further described with specific implementation mode for explanation below in conjunction with the accompanying drawings：
Embodiment 1
Fig. 3 shows that the typical case of the lime kiln system composition of the present invention calcined using hot wind and work are former
Reason figure, wherein 100- kiln bodies, 103- preheating sections, 104- calcine section, 105- cooling sections, 101- feeding mechanisms, 102- discharging machines
Structure, 200- combustion furnaces, 201- heat exchangers, 202- gaseous fuels, 203- combustion airs, 204- combustion furnace heat smokes, 205- dedustings
Device, the useless wind of 206- discharges, 207 cooling airs.
A kind of lime kiln device calcined using hot wind, including kiln body 100 and burner, wherein kiln body 100 is from upper
Include under and：Feeding mechanism 101, preheating section 103 calcine section 104, cooling section 105 and discharging mechanism 102, in the present embodiment,
Burner is combustion furnace 200.The calcining section 104 of kiln body is provided with hot wind inlet, is arranged on 103 top of preheating section of kiln body
There is useless wind to export, the hot wind inlet of kiln body 100 is connected with combustion furnace 200 by hot air duct.
Mineral aggregate enters kiln body 100 from feeding mechanism 101, and calcining section 104, combustion furnace are entered after the preheating of preheating section 103
The combustion furnace heat smoke 204 that 200 burnings generate is calcined from the 104 pairs of lime stone mineral aggregates of calcining section for entering kiln body 100, mine
Material generates lime in calcining section 104 through high-temperature calcination, and the lime of generation enters the cooling of cooling section 105, the lime finished product after cooling
It is discharged from the lower part discharging mechanism 102 of kiln body 100；Mixed flue gas after calcining enters the preheating section 103 of kiln body 100 to lime
Stone ore material is preheated, and the useless wind after cooling exports discharge kiln body 100 from useless wind and enters deduster 205, the useless wind warp after dedusting
Heat exchanger 201 becomes discharging useless wind after exchanging heat to be discharged；
Wherein, combustion air 203 and gaseous fuel 202 (such as blast furnace gas) enter combustion furnace after the preheating of heat exchanger 201
200 burn, and the heat smoke 204 of discharge enters the calcining section 104 of kiln body 100 through hot air duct；Cooling air 207 is from kiln body
The cooling section 105 of 100 lower parts enters kiln body, completes to mix with the hot wind inputted outside kiln upwards after cooling down lime finished product；
Wherein, combustion furnace preferably ceramic burner, the gaseous fuel 202 that combustion furnace 200 uses can be low calorie fuels,
Such as blast furnace gas；
Wherein, the temperature range of combustion furnace heat smoke 204 is within the scope of 800 DEG C~1250 DEG C, preferred scope is 850 DEG C~
1200℃。
For attached drawing 3 there is no some auxiliary equipment and equipment that those of display is not related to the present invention, it is not intended to this
A little affiliated facilities and equipment are for realizing what the present invention was not necessarily to, and purpose, inventor suggest adopting as far as possible to realize the present invention
With ripe these necessary affiliated facilities of technical configuration and equipment.
It will be recognized by those skilled in the art, can be to above-mentioned under the premise of without departing from protection scope of the present invention
Embodiment is carry out various modifications, changes and is combined, and thinks that this modification, variation and combination are the models in originality thought
Within enclosing.
Claims (10)
1. a kind of lime kiln device using hot wind, including kiln body and burner, which is characterized in that be provided in the kiln body
Section is calcined, burner provides heat smoke and calcined to the lime stone mineral aggregate in calcining section as hot wind, heat smoke cooling
Heel row goes out kiln body for being preheated to the combustion gas of burner and combustion-supporting gas.
2. a kind of lime kiln device using hot wind as described in claim 1, which is characterized in that the burner provided
Heat smoke is the heat smoke of set temperature.
3. a kind of lime kiln device using hot wind as claimed in claim 2, which is characterized in that the range of the set temperature
It is 800 DEG C -1250 DEG C.
4. a kind of lime kiln device using hot wind as claimed in claim 2, which is characterized in that kiln body also has preheating section,
Preheating section is located at before calcining section, and hot wind preheats the lime stone mineral aggregate positioned at preheating section after completing to calcine, after cooling
Kiln body is discharged.
5. a kind of lime kiln device using hot wind as claimed in claim 3, which is characterized in that kiln body also has cooling section,
Cooling section is located at after calcining section, and the lime stone finished product for calcining completion is discharged after cooling section cools down from kiln body.
6. a kind of lime kiln device using heat smoke as claimed in claim 5, which is characterized in that cooling section uses air pair
Lime stone finished product is cooled down.
7. a kind of lime kiln device using hot wind as claimed in claim 2, which is characterized in that also have dust-extraction unit, heat
Flue gas cool-down heel row goes out kiln body after dust-extraction unit dedusting for being preheated to the combustion gas of burner and combustion-supporting gas.
8. a kind of lime kiln device using hot wind as described in claim 1, which is characterized in that the kiln body is various erects
Formula limekiln, or the rotary kiln for lime calcining.
9. a kind of lime kiln device using hot wind as described in claim 1, which is characterized in that the combustion gas is coal gas, is helped
Combustion gas is combustion air.
10. a kind of method for producing lime using hot wind, which is characterized in that burner is arranged outside kiln body, is filled using burning
The heat smoke for setting offer calcines the lime stone mineral aggregate in kiln body as hot wind, and kiln body is discharged through removing in the heat smoke after cooling
Combustion gas for preheated burning device and combustion-supporting gas after dirt processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810686601.0A CN108675655A (en) | 2018-06-28 | 2018-06-28 | A kind of lime kiln device using hot wind |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810686601.0A CN108675655A (en) | 2018-06-28 | 2018-06-28 | A kind of lime kiln device using hot wind |
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| CN108675655A true CN108675655A (en) | 2018-10-19 |
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| CN201810686601.0A Pending CN108675655A (en) | 2018-06-28 | 2018-06-28 | A kind of lime kiln device using hot wind |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485277A (en) * | 2018-12-14 | 2019-03-19 | 邯郸钢铁集团有限责任公司 | A kind of natural gas calciner and method for limekiln |
| CN110937828A (en) * | 2019-12-15 | 2020-03-31 | 怀化鑫崀峰钙业有限公司 | Lime shaft kiln |
| CN111217542A (en) * | 2020-03-23 | 2020-06-02 | 南京威普粉体工程有限公司 | Sleeve shaft kiln for horizontal flow lime calcination |
| CN111544971A (en) * | 2020-04-30 | 2020-08-18 | 南京赤博环保科技有限公司 | Gas low-nitrogen low-dust combustion purification method and system |
| CN113336457A (en) * | 2021-07-10 | 2021-09-03 | 阳泉恒跃兴钙业有限公司 | Self-feedback calcination control method and device for lime fired by rotary kiln |
| CN114105499A (en) * | 2021-11-21 | 2022-03-01 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-chamber kiln |
| CN114873935A (en) * | 2022-03-17 | 2022-08-09 | 洛阳展腾科技有限公司 | Quick lime sintering method capable of reducing flue gas purification cost |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485277A (en) * | 2018-12-14 | 2019-03-19 | 邯郸钢铁集团有限责任公司 | A kind of natural gas calciner and method for limekiln |
| CN109485277B (en) * | 2018-12-14 | 2023-10-03 | 邯郸钢铁集团有限责任公司 | Natural gas calcination equipment and method for lime kiln |
| CN110937828A (en) * | 2019-12-15 | 2020-03-31 | 怀化鑫崀峰钙业有限公司 | Lime shaft kiln |
| CN111217542A (en) * | 2020-03-23 | 2020-06-02 | 南京威普粉体工程有限公司 | Sleeve shaft kiln for horizontal flow lime calcination |
| CN111217542B (en) * | 2020-03-23 | 2024-02-06 | 南京威普粉体工程有限公司 | Sleeve shaft kiln for calcining lime in advection manner |
| CN111544971A (en) * | 2020-04-30 | 2020-08-18 | 南京赤博环保科技有限公司 | Gas low-nitrogen low-dust combustion purification method and system |
| CN113336457A (en) * | 2021-07-10 | 2021-09-03 | 阳泉恒跃兴钙业有限公司 | Self-feedback calcination control method and device for lime fired by rotary kiln |
| CN114105499A (en) * | 2021-11-21 | 2022-03-01 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-chamber kiln |
| CN114105499B (en) * | 2021-11-21 | 2023-08-15 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-hearth kiln |
| CN114873935A (en) * | 2022-03-17 | 2022-08-09 | 洛阳展腾科技有限公司 | Quick lime sintering method capable of reducing flue gas purification cost |
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Address after: Room 1809, Machinery Building, 248 Guang'anmen Wai Street, Xicheng District, Beijing 100055 Applicant after: Wang Changchun Applicant after: Zhang Zihao Applicant after: Ao Wenqing Address before: Room 1809, Machinery Building, 248 Guang'anmen Wai Street, Xicheng District, Beijing 100055 Applicant before: Wang Changchun Applicant before: Zhang Zihao Applicant before: Ao Wenqing |
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| CB03 | Change of inventor or designer information |
Inventor after: Wang Changchun Inventor after: Zhang Zihao Inventor after: Ao Wenqing Inventor after: Ren Dejin Inventor after: Jia Bing Inventor before: Wang Changchun Inventor before: Zhang Zihao Inventor before: Ao Wenqing Inventor before: Ren Dejin Inventor before: Jia Bing |