CN208776590U - A kind of lime kiln device using hot wind - Google Patents

Abstract

The utility model relates to a kind of lime kiln devices of hot wind calcining, the hot wind calcined limestone that burner generates outside kiln is used when producing lime, for calcined waste heat wind for preheating 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.The utility model is by using hot wind calcined limestone, lime quality can be significantly improved, lime yield rate is improved, improves productivity, the utility model proposes limekiln do not configure buner system, burner apparatus of the hot wind of high-temperature calcination outside kiln, the blast furnace gas that burner apparatus can use low heat value does fuel, hot wind can be the hot fume of burner generation, thus is conducive to simplify kiln structure, reduces limekiln operating cost.

Description

A kind of lime kiln device using hot wind

Technical field

The utility model relates to a kind of limekiln dresses for being fuel using gas, being calcined using the hot wind inputted outside kiln It sets.

Background technique

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, the steel of every 1 ton of production 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 being 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 and combustion air generate after being mixed and burned 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 forges to 1200 DEG C of completions It burns, generates lime finished product；The lime of generation unloads outside kiln discharge after supercooling, 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 lower, 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 the pasc reaction in lime finished product and 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: having 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: having 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 kiln (Italy) etc., wherein answering With being more widely annulus shaft furnace, Maers Kiln；By mode of operation point: there is negative-pressure operation kiln (such as annulus shaft furnace) Kiln (such as co-current heat accumulated kiln with double shafts) is operated with positive pressure (micro-positive pressure).

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 require configuration buner system, the burner system of gas burning kiln It is made of as unified multiple rows of, multiple groups burner distribution, 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: 1- furnace body, 1a- cooling air, 2- feeding system, the upper inner sleeve of 3-1- Inner sleeve, 4- exhaust emission system, 4a- whole exhaust gas, 5- burner, 5a- combustion gas+burner are empty under cylinder, 3-2- heat exchanger, 3-3 Gas, 6- discharge system；Have in furnace body 1: the preheating zone 1-1-, 1-2- burning zone, 1-3- cooling zone.

In the 1-1 of preheating zone, lime stone is heated to its calcination temperature.The heat of preheating zone 1-1 is 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, enters to cooling after mineral aggregate preheating useless Gas system 4；Another part exhaust gas with extra heat enters heat exchanger 3-2 by upper inner sleeve 3-1, combustion-supporting for heating It is discharged after air through waste gas system 4, the combustion air after being heated then passes through pipeline and is sent to burner 5 for burning.

Calcination process is carried out in burning zone 1-2, and combustion gas and combustion air enter kiln body burning after mix in burner 5, Its high-temperature flue gas is used for limestone calcination, and lime finished product enters cooling zone 1-3 in the bottom burning zone 1-2.

In cooling zone 1-3, the cold air 1a of hot lime and kiln bottom sucking carries out heat exchange, and temperature passes through after reducing Kiln body is discharged in material system 6.Cooling air 1a enters in kiln from the lower part cooling zone 1-3, 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 top 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 include: the thermal efficiency is high, occupied area is small, Negative pressure operation etc..But the common problem of this type of furnace is that system complex, production capacity are lower, and single furnace 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 (usually double kiln thoraxes).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 by the channel out of burning kiln thorax, preheats 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- combustion Burning thorax, 7-1- burning wind, 7-2- burning zone, 7-3 cooling zone, 8- exhaust thorax, the preheating zone 8-1-, 8-2 exhaust gas, the channel 9-, 8-3 are cold But band, 10- cooling wind.

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, process flow, 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 lower, 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.

Utility model content

For above-mentioned problems of the prior art, the utility model provides a kind of using the stone for inputting hot wind outside kiln Ash furnace device, the device are to calcine mineral aggregate using hot wind, and hot wind does not have flame, temperature to stablize, and can obtain Gao Pin The lime finished product of position, avoids burning situation, the effect of thermostatic hot-air is to completely eliminate " underburnt " and " burning ", shortens and forges Burn the time.

In order to achieve the above objectives, the utility model adopts the technical scheme that

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 offer hot fume as hot wind to calcine the lime stone mineral aggregate in calcining section, hot fume cooling heel row goes out kiln body For to burner combustion gas and combustion-supporting gas preheat.

The hot fume that the burner provides is the hot fume of set temperature.

The range of the set temperature is 800 DEG C -1250 DEG C.

Kiln body also has preheating section, and preheating section is located at before calcining section, and hot wind is after completing calcining to positioned at preheating section Lime stone mineral aggregate is preheated, and cooling heel row goes out kiln body.

Kiln body also has cooling section, and cooling section is located at after calcining section, and the lime stone finished product for calcining completion is cold through cooling section But it is discharged after from kiln body.

Cooling section cools down lime stone finished product using air.

Also there is dust-extraction unit, hot fume cooling heel row goes 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.

The technical effect that the utility model has:

1, mineral aggregate is calcined using hot wind in the limekiln；Kiln body burner is eliminated, is inputted by burner The hot fume 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 mentioned in the case where not increasing kiln body volume High production capacity.Utility model people experiments are conducted on this verifying, it was demonstrated that with the hot wind calcined limestone of certain temperature, calcination time contracting Short 30-50% is more, and selecting reasonable calcination temperature is not reacted with impurity with lime finished product, lead to lime finished product Premised on activity degree reduces.

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 stable, reliable, and it is convenient for safeguarding, Reduce system maintenance cost；

4, the 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, lime is greatly reduced in the utility model Kiln operating cost.

Detailed description of the invention

The present invention will be further described with reference to the accompanying drawing:

Fig. 1 is one of the prior art described in background technique structural schematic diagram；

Fig. 2 is two structural schematic diagrams of the prior art described in background technique；

Fig. 3 is the lime kiln device operation principle schematic diagram in the utility model embodiment；

Specific embodiment

Explanation and specific embodiment are further described the utility model with reference to the accompanying drawing:

Embodiment 1

Fig. 3 show the utility model relates to using hot wind calcining lime kiln system composition typical case and work Make schematic diagram, wherein 100- kiln body, 103- preheating section, 104- calcining section, 105- cooling section, 101- feeding mechanism, 102- go out Expect mechanism, 200- combustion furnace, 201- heat exchanger, 202- gaseous fuel, 203- combustion air, 204- combustion furnace hot fume, 205- Deduster, 206- discharge useless wind, 207 cooling airs.

A kind of lime kiln device calcined using hot wind, including kiln body 100 and burner, wherein kiln body 100 from upper and Under include: feeding mechanism 101, preheating section 103 calcines section 1tu04, 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 set on 103 top of preheating section of kiln body It is equipped with useless wind outlet, 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 hot fume 204 that 200 burnings generate is calcined from the 104 pairs of lime stone mineral aggregates of calcining section for entering kiln body 100, mineral aggregate Generate lime through high-temperature calcination in calcining section 104, the lime of generation enters that cooling section 105 is cooling, the lime finished product after cooling from The lower part discharging mechanism 102 of kiln body 100 is discharged；Calcined mixed flue gas enters the preheating section 103 of kiln body 100 to lime stone Mineral aggregate is preheated, and the useless wind after cooling exports discharge kiln body 100 from useless wind and enters deduster 205, and the useless wind after dedusting is through changing Hot device 201, which 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 hot fume 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 the hot wind that lime finished product is inputted with kiln outside upwards after cooling；

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 hot fume 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 those of displays not to be related to some auxiliary equipment and equipment of the utility model, and unexpectedly These affiliated facilities of taste and equipment are practical new to realize the utility model aim for realizing what the utility model was not necessarily to Type people suggests configuring these necessary affiliated facilities and equipment using mature technology as far as possible.

It will be recognized by those skilled in the art, can be right under the premise of without departing from the protection scope of the utility model Above embodiment is carry out various modifications, changes and is combined, and thinks that this modification, variation and combination are in originality thought Within the scope of.

Claims (9)

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 hot fume as hot wind and calcines to the lime stone mineral aggregate in calcining section, hot fume cooling Heel row goes out kiln body for preheating 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 Hot fume is the hot fume 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 for being located at preheating section after completing calcining, 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 is cooling from kiln body.

6. a kind of lime kiln device using hot wind as claimed in claim 5, which is characterized in that cooling section is using air to stone 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 preheating 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.