CN1837118A - Method for producing lightly fired dolomite by shaft kiln - Google Patents
Method for producing lightly fired dolomite by shaft kiln Download PDFInfo
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- CN1837118A CN1837118A CN 200610034984 CN200610034984A CN1837118A CN 1837118 A CN1837118 A CN 1837118A CN 200610034984 CN200610034984 CN 200610034984 CN 200610034984 A CN200610034984 A CN 200610034984A CN 1837118 A CN1837118 A CN 1837118A
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Abstract
The invention discloses a shaft kiln producing caustic-burned dolomite method, which is characterized by the following: the purified B gas with the caloric value of 3000-3600kJ/m is adopted for fuel; the dolomite is produced with good quality, when the MgO content is lower; the percentage of weight content of CaO and MgO of caustic-burned dolomite completed product is lower than 1%; the activity degree is higher than 200ml/10min; the weight percentage content is lower than 1%; The shaft kiln availability ratio is hjher than 1.0t/m3 .d; energy-output ratio is lower 4.5kJ/kg; the out-kiln product relizes the unbruising and unbolting craft. The production adopting the invention consists of high activity and low impurity content.
Description
[technical field]
The present invention relates to a kind of technology of producing light dolomite, especially relate to a kind of method of utilizing low-heat value gas for the producing lightly fired dolomite by shaft kiln of fuel.
[background technology]
Along with the raising of steel-smelting technology level and the maximization of steel-making equipment, for improving the work-ing life of furnace lining, STEELMAKING PRODUCTION has had new requirement to the kind and the quality of slag making, residue adjustment material, except that a large amount of high-quality metallurgy limes of needs, also need a certain amount of light dolomite, be used to adjust slag basicity, improve slag flowability with extending furnace lining life, and the carrying out of improving desulfurization, dephosphorisation reaction.
Domestic each Iron And Steel Company is that fuel is fired light dolomite or outsourcing earth kiln product with coke or coal dust after mostly old-fashioned machine shaft kiln being transformed.Because solid fuel and rhombspar can not pre-fully mixings before going into kiln, layering or mixing when filling with substance can produce bigger particle segregation, make coke or the coal dust can not be with the rhombspar uniform mixing, fuel distribution inequality on the kiln section, the excessive temperature differentials that causes same section causes the big-difference of crossing of decomposition condition, the higher generation burning of local temperature, local temperature is on the low side and give birth to burning, and the product activity degree is reduced; Present coke or coal dust on the high side causes product cost higher in addition, and the ash in coke or the coal dust and sulphur content are all higher, can mix a large amount of P, SiO
2, Al
2O
3, impurity such as S, the efficient oxidation Mg content of light dolomite itself is reduced.
Of the prior artly go into kiln rhombspar raw material and do not pass through necessary pre-treatment, not only rubble is many, and surface adhesion has a large amount of sial impurity, as mud, sand etc., it is frequent that silt particle more and impurity that cause in surface increases, tie technology accident such as kiln, and it is excessive that quality product is fluctuateed.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of method of utilizing low-heat value gas for the producing lightly fired dolomite by shaft kiln of fuel.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of producing lightly fired dolomite by shaft kiln mainly comprises the steps:
A, pack the rhombspar raw material into kiln from shaft furnace top in, the clear height producer gas that acts as a fuel is through boosting and utilizing more than the sensible heat pre-heating temperature elevation to 180 ℃ of kiln discharge waste gas, the combustion air of air feed system also more than synchronous pre-heating temperature elevation to 250 ℃ back and above-mentioned heating gas send into synchronously in the shaft furnace, cooling air is then directly sent in the shaft furnace by air feed system;
B, rhombspar raw material in kiln from top to bottom through the preheating zone, divide ungird, cooling zone, the preheating zone temperature is controlled in 500 ℃～900 ℃ scopes, divide the temperature that ungirds to be controlled in 900 ℃～1050 ℃ scopes, the cooling zone temperature is controlled in 900 ℃～100 ℃ scopes, all is MgCO from the bottom, preheating zone to cooling zone top
3The decomposition region, by cooling zone bottom kiln discharge, promptly obtain the light dolomite finished product then, kiln discharge waste gas then enters residual neat recovering system.
The clear height producer gas is the low clear height producer gas of dustiness in the described steps A, and its calorific value is 3000～3600kJ/m
3
Rhombspar raw material in the described steps A carries out sufficient sieve classification and washing before going into kiln, it is 30～80mm that rhombspar is gone into the kiln particle diameter, and surface cleaning.
Air feed system adopts big air quantity operating duty in the described steps A, makes furnace air coefficient of excess α reach 1.6, to reduce the CO of airstream in kiln
2Dividing potential drop.
The kiln discharge flue gas of shaft furnace is handled through residual neat recovering system among the described step B, and this residual neat recovering system includes 220m
2Above bimetal tubular type interchanger, utilize high temperature kiln discharge flue gas that clear height producer gas and the combustion air that acts as a fuel carried out synchronous preheating, make the kiln temperature of going into of blast furnace gas bring up to 250 ℃, the kiln temperature of going into of combustion air reaches more than 180 ℃, and the temperature of kiln discharge flue gas is from more than 450 ℃, reduces to that after effluxes below 200 ℃.
Disposable load reaches 600mm among the described step B, reduces material in the thermal zone residence time.
Positively effect of the present invention is: because the clear height producer gas that is adopted is Steel Plant's generation maximum, minimum, the cheap by-product gas of calorific value, belong to utilization of waste material, environmental pollution also reduces, and has produced bigger social benefit and economic benefit; In addition, the blast furnace gas that adopt to purify, having overcome with coke or coal dust is that fuel is when firing light dolomite, because of the fuel distribution inequality on the kiln section, cause the excessive temperature differentials of same section, cause the big-difference of crossing of decomposition condition, the higher generation burning of local temperature, local temperature is on the low side and living the burning; Fuel is brought a large amount of P, SiO into
2, Al
2O
3, S impurity, the efficient oxidation Mg content of light dolomite itself is reduced, a series of defectives such as foreign matter content is higher, activity degree is low, production cost height.
As everyone knows, guarantee MgCO in the rhombspar
3When decomposing fully, also guarantee CaCO wherein
3Resolution, and the high reactivity in the maintenance degradation production, calcining belt temperature must be stabilized in 900 ℃～1050 ℃ scopes, and the calorific value of clear height producer gas is lower, is 3000～3600kJ/m
3, be difficult to reach this requirement.For calcining belt temperature being stabilized in 900 ℃～1050 ℃ scopes, the present invention has utilized the sensible heat of kiln discharge flue gas to blast furnace gas and the synchronous preheating of combustion air, thereby guaranteed that calcining belt temperature is stabilized in 900 ℃～1050 ℃ scopes, and then guaranteed the quality of kiln discharge product.
With particle diameter is 30～80mm, the rhombspar of surface cleaning is a raw material, making into, the foreign matter content of stove is effectively controlled, and guaranteed ventilation property in the kiln, thereby stably produce the light dolomite of good quality, in the gained light dolomite finished product weight percent content of CaO and MgO greater than 90%, activity degree is greater than 200ml/10min, detrimental impurity total amount 1%, shaft furnace utilization coefficient are up to 1.0t/m
3More than the d, product energy consumption is lower than 4.5kJ/kg, and the kiln discharge product can realize not having broken no sieving technology; Adopt products obtained therefrom of the present invention to have product activity degree height, foreign matter content is low, the efficient oxidation magnesium is high advantage, it is low and can use the secondary energy, the i.e. technical characteristic of low combustion value furnace gas inferior that the present invention simultaneously has a production cost.
[description of drawings]
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a technical process block diagram of the present invention;
Fig. 2 is a shaft furnace fundamental diagram of the present invention.
[embodiment]
Referring to Fig. 1 and Fig. 2, a kind of technology of producing lightly fired dolomite by shaft kiln at first is the rhombspar of 0～80mm is transported to stock yard by automobile transitional storehouse with lumpiness; Sieving wherein through the garden bucket, the rock screen of 0～30mm goes, rubble and silt particle enter the minus mesh recovery system and recycle, and the silt particle of the rhombspar surface attachment of 30～80mm is rinsed the former feed bin (being the preceding storehouse of kiln) that enters after clean before the shaft furnace, is then packed in the shaft furnace by the material loading facility; The clear height producer gas that acts as a fuel then boosts and sends in the kiln after residual neat recovering system makes its temperature be elevated to more than 180 ℃ through gas pressure system, combustion air from air feed system is also sent in the kiln with heating gas after residual neat recovering system makes its temperature be elevated to more than 250 ℃ synchronously, and this residual neat recovering system includes 220m
2Above bimetal tubular type interchanger utilizes high temperature kiln discharge flue gas that clear height producer gas and the combustion air that acts as a fuel carried out synchronous preheating, and cooling air is then directly sent in the kiln by air feed system; The kiln discharge flue gas through through the residual neat recovering system temperature by more than 450 ℃, be reduced to that after effluxes below 200 ℃.
Rhombspar raw material after above-mentioned processing enters in the kiln from shaft furnace top, in kiln from top to bottom through the preheating zone, divide ungird, cooling zone, the preheating zone temperature is controlled in 500 ℃～900 ℃ scopes, divide the temperature that ungirds to be controlled in 900 ℃～1050 ℃ scopes, the cooling zone temperature is controlled in 900 ℃～100 ℃ scopes, all is MgCO from the bottom, preheating zone to cooling zone top
3The decomposition region, by cooling zone bottom kiln discharge, promptly obtain the light dolomite finished product then.Adopt big air quantity operating duty, make furnace air coefficient of excess α reach 1.6, to reduce the CO of airstream in kiln
2Dividing potential drop.Because the MgCO in the rhombspar
3Middle and lower part in the shaft furnace preheating zone has promptly begun to take place decomposition reaction, has arrived the calcining zone bottom and has then reached complete decomposing state, for guaranteeing the MgCO in the rhombspar
3When decomposing fully, also guarantee CaCO wherein
3Higher resolution is arranged, adopt that big dress goes out greatly, big air quantity operating duty, to reduce material, prevent MgO thickization of crystal grain and cause active decline, and help accelerating CaCO in the thermal zone residence time
3Decomposition.Owing to adopted the working method of big air quantity, made CO in the kiln
2Dividing potential drop reduces, and helps accelerating the decomposition of carbonate, but the increase of kiln discharge exhaust gas volumn, its sensible heat of taking out of also increases, and therefore adopts the larger area interchanger with abundant recovery waste heat.
The thermal degradation characteristic that the present invention is directed to rhombspar is different with Wingdale: promptly rhombspar is that its decomposition course of double salt is to carry out stage by stage, the different of the height of temperature, the length of time and atmosphere are played conclusive effect to its decomposition rate and resolution, CaCO wherein
3Begin to decompose about 900 ℃, its optimum calcinating temperature is between 950 ℃～1150 ℃, and MgCO
3Then promptly begin the characteristic of decomposing about 700 ℃, the temperature control when producing light dolomite is adopted the lower low combustion value furnace gas of theoretical combustion temperature, its caloric power of gas: 3000～3600kJ/m as one of gordian technique
3, with 220m
2Reach above bimetal tubular type interchanger and utilize high temperature kiln discharge flue gas to carry out synchronous preheating, calcining belt temperature is stabilized between 900 ℃～1050 ℃, thereby makes the MgCO in the rhombspar going into wind of kiln and blast furnace gas
3When decomposing fully, also guaranteed CaCO wherein
3Resolution, and kept the high reactivity of degradation production MgO, CaO.
The present invention has that production cost is low, good product quality and can to use the secondary energy inferior be the low heat value blast furnace The technical characteristic of coal gas.
Claims (7)
1, a kind of method of producing lightly fired dolomite by shaft kiln is characterized in that: mainly comprise the steps:
A, pack the rhombspar raw material into kiln from shaft furnace top in, the clear height producer gas that acts as a fuel is through boosting and utilizing more than the sensible heat pre-heating temperature elevation to 180 ℃ of kiln discharge waste gas, the combustion air of air feed system also more than synchronous pre-heating temperature elevation to 250 ℃ back and above-mentioned heating gas send into synchronously in the shaft furnace, cooling air is then directly sent in the shaft furnace by air feed system;
B, rhombspar raw material in kiln from top to bottom through the preheating zone, divide ungird, cooling zone, the preheating zone temperature is controlled in 500 ℃～900 ℃ scopes, divide the temperature that ungirds to be controlled in 900 ℃～1050 ℃ scopes, the cooling zone temperature is controlled in 900 ℃～100 ℃ scopes, all is MgCO from the bottom, preheating zone to cooling zone top
3The decomposition region, by cooling zone bottom kiln discharge, promptly obtain the light dolomite finished product then, kiln discharge waste gas then enters residual neat recovering system.
2, the method for producing lightly fired dolomite by shaft kiln according to claim 1 is characterized in that: the clear height producer gas is the low clear height producer gas of dustiness in the described steps A, and its calorific value is 3000～3600kJ/m
3
3, the method for producing lightly fired dolomite by shaft kiln according to claim 1 and 2 is characterized in that: the rhombspar raw material in the described steps A carries out sufficient sieve classification and washing before going into kiln, and it is 30～80mm that rhombspar is gone into the kiln particle diameter, and surface cleaning.
4, the method for producing lightly fired dolomite by shaft kiln according to claim 1 and 2 is characterized in that: air feed system adopts big air quantity operating duty in the described steps A, makes furnace air coefficient of excess α reach 1.6, to reduce the CO of airstream in kiln
2Dividing potential drop.
5, the method for producing lightly fired dolomite by shaft kiln according to claim 3 is characterized in that: air feed system adopts big air quantity operating duty in the described steps A, makes furnace air coefficient of excess α reach 1.6, to reduce the CO of airstream in kiln
2Dividing potential drop.
6, the method for producing lightly fired dolomite by shaft kiln according to claim 1 is characterized in that: the kiln discharge flue gas of shaft furnace is handled through residual neat recovering system among the described step B, and this residual neat recovering system includes 220m
2Above bimetal tubular type interchanger, utilize high temperature kiln discharge flue gas that clear height producer gas and the combustion air that acts as a fuel carried out synchronous preheating, make the kiln temperature of going into of blast furnace gas bring up to 250 ℃, the kiln temperature of going into of combustion air reaches more than 180 ℃, and the temperature of kiln discharge flue gas is from more than 450 ℃, reduces to that after effluxes below 200 ℃.
7, according to the method for claim 1 or 6 described producing lightly fired dolomite by shaft kiln, it is characterized in that: disposable load reaches 600mm among the described step B, reduces material in the thermal zone residence time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610034984 CN1837118A (en) | 2006-04-14 | 2006-04-14 | Method for producing lightly fired dolomite by shaft kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610034984 CN1837118A (en) | 2006-04-14 | 2006-04-14 | Method for producing lightly fired dolomite by shaft kiln |
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| CN1837118A true CN1837118A (en) | 2006-09-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100560527C (en) * | 2006-10-24 | 2009-11-18 | 昆明钢铁集团有限责任公司 | The technology and the system of comprehensive utilization soft-burned dolomite fines |
| CN101269919B (en) * | 2008-05-08 | 2010-06-09 | 贾会平 | Vertical kiln apparatus for materials calcination |
| CN106495508A (en) * | 2016-10-13 | 2017-03-15 | 辽宁劲达华杰工程技术有限公司 | A kind of environmental protection and energy saving light calcined magnesia calcining kiln |
| CN113233794A (en) * | 2021-06-01 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Light calcined dolomite and method for reducing calcined powder rate of high-iron aluminum dolomite |
| CN116217100A (en) * | 2023-01-09 | 2023-06-06 | 广西柳钢新材料科技有限公司 | Method for stably controlling ash temperature of finished product by double-hearth kiln |
-
2006
- 2006-04-14 CN CN 200610034984 patent/CN1837118A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100560527C (en) * | 2006-10-24 | 2009-11-18 | 昆明钢铁集团有限责任公司 | The technology and the system of comprehensive utilization soft-burned dolomite fines |
| CN101269919B (en) * | 2008-05-08 | 2010-06-09 | 贾会平 | Vertical kiln apparatus for materials calcination |
| CN106495508A (en) * | 2016-10-13 | 2017-03-15 | 辽宁劲达华杰工程技术有限公司 | A kind of environmental protection and energy saving light calcined magnesia calcining kiln |
| CN113233794A (en) * | 2021-06-01 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Light calcined dolomite and method for reducing calcined powder rate of high-iron aluminum dolomite |
| CN116217100A (en) * | 2023-01-09 | 2023-06-06 | 广西柳钢新材料科技有限公司 | Method for stably controlling ash temperature of finished product by double-hearth kiln |
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