CN103936307A - Low-temperature lime production method using sleeve kiln - Google Patents
Low-temperature lime production method using sleeve kiln Download PDFInfo
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- CN103936307A CN103936307A CN201410113866.3A CN201410113866A CN103936307A CN 103936307 A CN103936307 A CN 103936307A CN 201410113866 A CN201410113866 A CN 201410113866A CN 103936307 A CN103936307 A CN 103936307A
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Abstract
The invention relates to a low-temperature lime production method using a sleeve kiln. The method comprises the steps of: (1) employing a jet pipe with a jet nozzle diameter being not more than 48mm; (2) adjusting the pressure of high-speed gas fed into the jet pipe on the basis of production output, wherein the pressure is particularly adjusted to following values: 38kpa when the production output is not more than 250 tons, 39kpa when the production output ranges from 250 tons to 300 tons, 40kpa when the production output ranges from 300 tons to 330 tons, 41kpa when the production output ranges from 330 tons to 350 tons, 42kpa when the production output ranges from 350 tons to 380 tons, 43kpa when the production output ranges from 380 tons to 420 tons and 43kpa when the production output is not less than 420 tons; (3) increasing temperature by at least 5 DEG C on the basis of the present temperature of the recycle gas; (4) setting a cooling air distribution coefficient ranging from 0.49-0.53 on the basis of change of the production output; (5) closing a secondary air inlet of a lower combustion chamber to reduce the air inlet flow by 1000-1500 m<3>/h; and (6) controlling the particle fraction distribution and the cleanliness factor of the raw material limestone to a particle size of the limestone ranging from 40mm ash-outlet temperature, the temperature of the lime can reduce by 30 DEG C with the production method.
Description
Technical field
The present invention relates to a kind of lime production method, especially a kind of sleeve kiln low temperature lime production method, belongs to calcining technology field.
Background technology
Along with development and the structure of industrial society make the transition, extensive Development patterns is also come to be more restricted, and it is further important that the Economic Development Mode of environmental protection intensive style seems; In traditional mass transport, open type flat belt accounts for the overwhelming majority, is replaced by air conveying or tubular belt gradually now.But, because pipe turns the material character of belt self, can not carry high-temperature material, therefore, reduce the temperature that is transferred material and be one and be worth the problem of discussing; Sleeve lime kiln is the one in limestone kiln, is mainly made up of inner core and urceolus, and inner core and urceolus arranged concentric, form an annular space, and Wingdale is just calcined in this annular region; Kiln body is divided into preheating zone from top to bottom, adverse current calcining zone, and flow calcining zone and cooling zone; Preheating zone utilizes the high temperature air preheating limestone material after calcining, and calcining zone utilization burning liberated heat is calcined Wingdale, makes decomposition of limestone become lime and carbonic acid gas, and the lime after cooling zone utilizes freezing air to calcining carries out cooling; The time length that the metallurgy lime ash discharge temperature that sleeve kiln is produced depends on raw burn degree and stops in kiln, recycle gas temperature is the most important parameter of reflection lime quality, and therefore how reasonably reducing tapping temperature and improving recycle gas efficiency becomes a crucial working point; Find that through retrieval authorizing day is 2013.9.18, application number is that 201210124850.3 Chinese patent discloses " a kind of sleeve kiln lime cooling apparatus ", this equipment reaches cooling object by the design of arranging of ventilation hole, but this equipment does not provide concrete design variable and method, can not actually solve the problem existing at present.
Summary of the invention
Technical problem to be solved by this invention is: overcome the problem that prior art exists, the sleeve kiln low temperature lime production method of cooling in a kind of kiln is provided.
The technical scheme that the present invention solves its technical problem is as follows:
A kind of sleeve kiln low temperature lime production method, the kiln body of sleeve kiln includes inner sleeve, be provided with upper and lower combustion chamber with it at kiln, be provided with lime cooling air inlet in the bottom of kiln body, upper and lower burner is installed respectively in outside, upper and lower combustion chamber, upper burner radially connects a wind that is derived from inner sleeve interlayer, the lower burner bright eruption place of lower combustion chamber radially connects the secondary air that is derived from interchanger, the gas channel of combustion chamber in kiln body is connected with inner sleeve bottom, and inner sleeve top is communicated with air-supply assembly through return flow line; In sleeve kiln, be also provided with air-supply assembly, air-supply assembly comprises the outside ventpipe for delivery of high temperature circulation gas and is inserted in the spray tube for delivery of high-speed gas of injector blast inlet; The method comprises the following steps:
(1) make the injection bore≤48mm of spray tube;
Applicant thinks: set the entrance pipe of ventpipe and the pressure of outlet section pipe and be respectively P
4and P
0, the blast inlet of injector and the pressure reduction of air outlet are:
Wherein: P
4-P
0for ventpipe import and export pressure reduction, the Pa of unit; A1 is spray tube exit area, the m2 of unit; A3 is mixing section tube section area, the m2 of unit; The density that ρ 1 is high-speed gas, units/kg/m3; ω 1 is the flow velocity of high-speed gas in spray tube outlet, the m/s of unit.
Formula is known thus, in the situation that other parameter remains unchanged, reducing A1 can impel ω 1 to improve, go deep into practical studies checking through applicant, the injection bore of spray tube is adjusted into 48mm at the most, can reduce driving air flow quantity, improve and drive air pressure and recycle gas flow, make and to flow calcining more abundant, lime is cooling more even, makes full kiln coefficient of excess air more reasonable.
(2) enter the pressure of spray tube according to gas product flow readjustment high-speed gas specific as follows: output≤250 ton, pressure 38kpa; Output 250-300 ton, pressure 39kpa; Output 300-330 ton, pressure 40kpa; Output 330-350 ton, pressure 41kpa; Output 350-380 ton, pressure 42kpa; Output 380-420 ton, pressure 43kpa; Output >=420 ton, pressure 43kpa;
Be greater than after 420 tons at day output, drive the pressure change of wind very little, main two reasons: the one, the security standpoint of equipment itself, the 2nd, drive flow ascensional range comparison slow of wind itself, can no longer improve.
(3) existing recycle gas temperature 760-880 DEG C, 5 DEG C of minimum raisings on the temperature basis of existing recycle gas;
Can reduce like this raw burn rate.
(4) partition ratio of adjustment cooling air is 0.49-0.53, cooling air partition ratio=cooling air flow/kiln hourly output, and cooling air flow unit is m3/h, kiln hourly output unit is kg/h;
Can guarantee like this cooling air that provides enough, the lime after sleeve kiln cooling zone utilizes freezing air to calcining carries out cooling, and cooling zone cooling air is evenly distributed, ash discharge temperature-stable, the quality of raising lime product.
(5) close lower combustion chamber's secondary air, reduce air output 1000-1500m
3/ h;
The object of closing 2 wind reduces exhausted air quantity in kiln exactly, reduces the load of high-temperature blower; This step operation simultaneously can reduce cooling air flow and drive wind flow to increase the impact on air utilization coefficient.
(6) adopt the Wingdale that granularity is 40-70mm, and control ratio sum≤4% that diameter is less than 40mm and is greater than the Wingdale of 70mm;
The apparent cleanliness factor of Wingdale is most important, has influence on the ventilation property in kiln, and produces dross; Therefore needing to control raw material limestone grade distributes and cleanliness factor.
The further technical scheme of the present invention is as follows:
Further, in step (1), the injection bore of spray tube is 48mm; In step (3), the temperature of recycle gas improves 5 DEG C; In step (4), the partition ratio of cooling air is 0.49-0.50; In step (5), reduce air output 1000-1200m
3/ h; In step (6), limestone granularity is 40-50mm, and it is 4% with the ratio sum of the Wingdale that is greater than 70mm that diameter is less than 40mm.
Further, in step (1), the injection bore of spray tube is 47mm; In step (3), the temperature of recycle gas improves 10 DEG C; In step (4), the partition ratio of cooling air is 0.50-0.53; In step (5), reduce air output 1200-1500m
3/ h; In step (6), limestone granularity is 50-70mm, and it is 3% with the ratio sum of the Wingdale that is greater than 70mm that diameter is less than 40mm.
Beneficial effect of the present invention is as follows:
1,400 tons of above sleeve kilns of day output, at present general ash discharge temperature range is probably at 150-200 degree, by the production method that uses above each step to be combined to form, lime temperature can compared with normal ash discharge temperature reduce by 30 DEG C, cooling-down effect is remarkable, effectively realize cooling in kiln, realize the major technological breakthrough of this area;
2, found out by great many of experiments the relation between wind flow and output that drives, under the prerequisite of producing smoothly at product, made the pressure of high-speed gas reach optimum;
3, by the specification of raw material is limited, raw material is dropped to minimum on the impact of producing;
4,, by the theoretical model of air-supply assembly is derived, shown that the best of spray tube is sprayed bore scope.
Brief description of the drawings
Fig. 1 is embodiment of the present invention air-supply unit construction used schematic diagram.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the present invention is described in further detail.But the invention is not restricted to given example.
Embodiment
The sleeve kiln low temperature lime production method of the present embodiment, the kiln body of sleeve kiln includes inner sleeve, be provided with upper and lower combustion chamber with it at kiln, be provided with lime cooling air inlet in the bottom of kiln body, upper and lower burner is installed respectively in outside, upper and lower combustion chamber, upper burner radially connects a wind that is derived from inner sleeve interlayer, the lower burner bright eruption place of lower combustion chamber radially connects the secondary air that is derived from interchanger, the gas channel of combustion chamber in kiln body is connected with inner sleeve bottom, inner sleeve top is communicated with air-supply assembly through return flow line
Carry out as follows:
(1) the injection bore d1≤48mm of spray tube; The air-supply assembly of recycle gas as shown in Figure 1, described air-supply assembly comprises the outside ventpipe for delivery of high temperature circulation gas and is inserted in the spray tube for delivery of high-speed gas of described injector blast inlet, described ventpipe mainly by receive recycle gas bellmouth entrance section pipe, form for the mixing section pipe of mixing two fluids and the outlet section pipe of diffusion speedup; Set the entrance pipe of ventpipe and the pressure of outlet section pipe and be respectively P
4and P
0, the blast inlet of injector and the pressure reduction of air outlet are:
Wherein: P
4-P
0for ventpipe import and export pressure reduction, the Pa of unit; A1 is spray tube exit area, the m2 of unit; A3 is mixing section tube section area, the m2 of unit; The density that ρ 1 is high-speed gas, units/kg/m3; ω 1 is the flow velocity of high-speed gas in spray tube outlet, the m/s of unit.
| Embodiment | Embodiment 1 | Embodiment 2 |
| Spray bore (unit: mm) | 48 | 47 |
(2) enter the pressure of spray tube according to gas product flow readjustment high-speed gas specific as follows: output≤250 ton, pressure 38kpa; Output 250-300 ton, pressure 39kpa; Output 300-330 ton, pressure 40kpa; Output 330-350 ton, pressure 41kpa; Output 350-380 ton, pressure 42kpa; Output 380-420 ton, pressure 43kpa; Output >=420 ton, pressure 43kpa; Be greater than after 420 tons at day output, drive the pressure change of wind very little, main two reasons: the one, the security standpoint of equipment itself, the 2nd, drive flow ascensional range comparison slow of wind itself, can no longer improve;
(3) 5 DEG C of minimum raisings on the temperature basis of existing recycle gas; This is to improve the upper limit in order to reduce raw burn rate;
| Embodiment | Embodiment 1 | Embodiment 2 |
| Recycle gas temperature (unit: mm) | 5 | 10 |
(4) enough cooling airs, according to change of production, the partition ratio of cooling air is at 0.49-0.53; Lime after sleeve kiln cooling zone utilizes freezing air to calcining carries out cooling, and cooling zone cooling air is evenly distributed, ash discharge temperature-stable, the quality of raising lime product;
| Embodiment | Embodiment 1 | Embodiment 2 |
| The partition ratio (unit: nothing) of cooling air | 0.49-0.50 | 0.50-0.53 |
(5) close lower combustion chamber's secondary air, reduce air output 1000-1500m
3/ h, this is in order to reduce cooling air flow and to drive wind flow to increase the impact on air utilization coefficient;
| Embodiment | Embodiment 1 | Embodiment 2 |
| Air output (unit: m 3/h） | 1000-1200 | 1200-1500 |
(6) the apparent cleanliness factor of Wingdale is most important, has influence on the ventilation property in kiln, and produces dross; Therefore need to control raw material limestone grade and distribute and cleanliness factor, limestone granularity is 40-70mm, and diameter is less than 40mm and is greater than ratio sum≤4% of Wingdale of 70mm;
| Embodiment | Embodiment 1 | Embodiment 2 |
| Limestone granularity (unit: mm) | 1000-1200 | 1200-1500 |
| Diameter is less than 40mm and is greater than the ratio of the Wingdale of 70mm | 4% | 3% |
400 tons of above sleeve kilns of day output, at present general ash discharge temperature range is probably at 150-200 degree, by the production method that uses above each step to be combined to form, lime temperature can compared with normal ash discharge temperature reduce by 30 DEG C, cooling-down effect is remarkable, effectively realize cooling in kiln, realize the major technological breakthrough of this area;
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (3)
1. a sleeve kiln low temperature lime production method, the kiln body of described sleeve kiln includes inner sleeve, be provided with upper and lower combustion chamber with it at kiln, be provided with lime cooling air inlet in the bottom of described kiln body, upper and lower burner is installed respectively in outside, described upper and lower combustion chamber, described upper burner radially connects a wind that is derived from inner sleeve interlayer, the lower burner bright eruption place of described lower combustion chamber radially connects the secondary air that is derived from interchanger, the gas channel of combustion chamber in kiln body is connected with inner sleeve bottom, and described inner sleeve top is communicated with air-supply assembly through return flow line; In described sleeve kiln, be also provided with air-supply assembly, described air-supply assembly comprises the outside ventpipe for delivery of high temperature circulation gas and is inserted in the spray tube for delivery of high-speed gas of described injector blast inlet; It is characterized in that, comprise the following steps:
(1) make the injection bore≤48mm of spray tube;
(2) enter the pressure of spray tube according to gas product flow readjustment high-speed gas specific as follows: output≤250 ton, pressure 38kpa; Output 250-300 ton, pressure 39kpa; Output 300-330 ton, pressure 40kpa; Output 330-350 ton, pressure 41kpa; Output 350-380 ton, pressure 42kpa; Output 380-420 ton, pressure 43kpa; Output >=420 ton, pressure 43kpa;
(3) 5 DEG C of minimum raisings on the temperature basis of existing recycle gas;
(4) partition ratio of adjustment cooling air is 0.49-0.53;
(5) close lower combustion chamber's secondary air, reduce air output 1000-1500m3/h;
(6) adopt the Wingdale that granularity is 40-70mm, and control ratio sum≤4% that diameter is less than 40mm and is greater than the Wingdale of 70mm.
2. sleeve kiln low temperature lime production method according to claim 1, is characterized in that: in step (1), the injection bore of spray tube is 48mm; In step (3), the temperature of recycle gas improves 5 DEG C; In step (4), according to output, the partition ratio of cooling air is at 0.49-0.50; In step (5), reduce air output 1000-1200m3/h; In step (6), limestone granularity is 40-50mm, and it is 4% with the ratio sum of the Wingdale that is greater than 70mm that diameter is less than 40mm.
3. sleeve kiln low temperature lime production method according to claim 1, is characterized in that: in step (1), the injection bore of spray tube is 47mm; In step (3), the temperature of recycle gas improves 10 DEG C; In step (4), according to output, the partition ratio of cooling air is at 0.50-0.53; In step (5), reduce air output 1200-1500m3/h; In step (6), limestone granularity is 50-70mm, and it is 3% with the ratio sum of the Wingdale that is greater than 70mm that diameter is less than 40mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113866.3A CN103936307B (en) | 2014-03-25 | 2014-03-25 | A kind of sleeve kiln low temperature lime production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410113866.3A CN103936307B (en) | 2014-03-25 | 2014-03-25 | A kind of sleeve kiln low temperature lime production method |
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| Publication Number | Publication Date |
|---|---|
| CN103936307A true CN103936307A (en) | 2014-07-23 |
| CN103936307B CN103936307B (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851238A (en) * | 2017-11-30 | 2019-06-07 | 南京梅山冶金发展有限公司 | A kind of method of stable annular lime kiln cocurrent burning zone control |
Citations (5)
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|---|---|---|---|---|
| US4431407A (en) * | 1981-10-13 | 1984-02-14 | Ulrich Beckenbach | Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same |
| US4668184A (en) * | 1986-07-08 | 1987-05-26 | Fuller Company | Annular shaft kiln |
| KR100894056B1 (en) * | 2002-10-15 | 2009-04-21 | 주식회사 포스코 | Device for protecting closure of port for recuperator in shaft kiln |
| CN102627417A (en) * | 2012-04-26 | 2012-08-08 | 石家庄市新华工业炉有限公司 | Lime cooling equipment of sleeve kiln |
| CN202836180U (en) * | 2012-08-08 | 2013-03-27 | 南京梅山冶金发展有限公司 | Ring-shaped sleeve kiln |
-
2014
- 2014-03-25 CN CN201410113866.3A patent/CN103936307B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4431407A (en) * | 1981-10-13 | 1984-02-14 | Ulrich Beckenbach | Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same |
| US4668184A (en) * | 1986-07-08 | 1987-05-26 | Fuller Company | Annular shaft kiln |
| KR100894056B1 (en) * | 2002-10-15 | 2009-04-21 | 주식회사 포스코 | Device for protecting closure of port for recuperator in shaft kiln |
| CN102627417A (en) * | 2012-04-26 | 2012-08-08 | 石家庄市新华工业炉有限公司 | Lime cooling equipment of sleeve kiln |
| CN202836180U (en) * | 2012-08-08 | 2013-03-27 | 南京梅山冶金发展有限公司 | Ring-shaped sleeve kiln |
Non-Patent Citations (2)
| Title |
|---|
| 张全生: "低热值煤气煅烧高品质石灰工艺分析", 《现代冶金》, vol. 41, no. 6, 31 December 2013 (2013-12-31), pages 23 - 15 * |
| 王国强: "环型套筒窑结构优势及运行控制", 《梅山科技》, no. 1, 15 July 2008 (2008-07-15), pages 20 - 24 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851238A (en) * | 2017-11-30 | 2019-06-07 | 南京梅山冶金发展有限公司 | A kind of method of stable annular lime kiln cocurrent burning zone control |
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|---|---|
| CN103936307B (en) | 2016-01-20 |
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