CN103940238A - Annular sleeve kiln - Google Patents
Annular sleeve kiln Download PDFInfo
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- CN103940238A CN103940238A CN201410203546.7A CN201410203546A CN103940238A CN 103940238 A CN103940238 A CN 103940238A CN 201410203546 A CN201410203546 A CN 201410203546A CN 103940238 A CN103940238 A CN 103940238A
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- kiln
- sleeve
- combustion chamber
- lower sleeve
- upper bush
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Abstract
The invention discloses an annular sleeve kiln which comprises a kiln housing, an upper sleeve provided with a cooling interlayer, a lower sleeve provided with a cooling interlayer, a material distributing system arranged at the upper end of an annular channel, an upper combustion chamber, a lower combustion chamber and nozzles arranged at the outer ends of the upper combustion chamber and the lower combustion chamber. The upper sleeve and the lower sleeve are arranged in the kiln housing. The annular channel is formed among the upper sleeve, the lower sleeve and the kiln casing. The upper combustion chamber and the lower combustion chamber are arranged on the periphery of the outer side of the kiln casing and distributed at interval. The upper sleeve is smaller than the lower sleeve in outer diameter. Due to the fact that the upper sleeve is smaller than the lower sleeve in outer diameter, the size of a pre-heating tape annular space between the upper sleeve and the kiln casing is increased, accordingly the pre-heating tape limestone amount is increased, the heat transfer efficiency of kiln top smoke and limestone is improved, the temperature of smoke discharged from the kiln top is reduced, and the purposes of reducing heat consumption and saving energy are achieved.
Description
Technical field
The present invention relates to a kind of annular lime kiln, especially a kind of non-constant section annular lime kiln, belongs to calciner technical field.
Background technology
The typical structure of existing annular lime kiln is as disclosed in US4431407 United States Patent (USP), and design conditions when this type of sleeve kiln is introduced are at first that fuel value requires 1800kCal/Nm
3(7537kJ/Nm
3), the further improvement design through domestic sleeve kiln industry specialists, can make sleeve kiln be low to moderate 1400kCal/Nm at calorific value of gas
3(5862kJ/Nm
3) condition assign product.But the entrained heat of excessive flue gas that low-heat value gas combustion produces can not fully be absorbed by the bed of material, often makes the exhaust gas temperature of sleeve kiln too high.The air inducing amount of having to limit exhaust gas fan for controlling the exhaust gas temperature of sleeve kiln, makes so again lime cooling-air suck not enough, causes ash discharge temperature drift.The exhaust gas temperature of sleeve kiln and ash discharge excess Temperature not only make the hear rate of sleeve kiln increase and also entail dangers to the safe handling of kiln top equipment and ash discharge equipment.
For overcoming above-mentioned shortcoming, the method that lengthens preheating zone can increase the heat exchange area and the amount of stored heat that increases lime stone between flue gas and lime stone, it is the effective way that reduces lime shaft kiln exhaust gas temperature, but increased flue gas by the resistance of the bed of material, certainly will strengthen the load of air inducing equipment, lengthen preheating zone has also increased construction cost simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of non-constant section annular lime kiln, thereby do not increasing on the basis of annular lime kiln construction cost, reduce kiln top temperature, ash discharge temperature, the UTILIZATION OF VESIDUAL HEAT IN that strengthens flue gas, makes kiln top equipment and the stable operation under the environment of safety of ash discharge equipment.The technical solution used in the present invention is: a kind of annular lime kiln, comprising: kiln shell; Be placed in the upper bush with cooling sandwith layer, lower sleeve in kiln shell, between described upper bush, lower sleeve and kiln shell, form circular passage; Be placed in the cloth system of upper end, described circular passage; Be arranged on kiln shell outer circumference and upper combustion chamber and lower combustion chamber spaced apart; Be arranged on the burner of described upper combustion chamber and lower combustion chamber outer end; The external diameter of wherein said upper bush is less than the external diameter of lower sleeve.
The present invention further technical characterictic is:
The magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.7～0.9D.
The magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.7D.
The magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.75D.
The magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.8D.
The magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.9D.
The invention has the beneficial effects as follows:
1, because upper bush external diameter is less than lower sleeve external diameter, annular space between upper bush and kiln shell increases comparatively speaking, be that preheating zone annular space strengthens, thereby increase the amount that preheating zone can hold lime stone, increase heat exchange area and the amount of stored heat that increases lime stone between flue gas and lime stone, finally can reduce the temperature of kiln top flue gas.
2, because flue gas enters heat exchanger to driving the heat reclaiming after air heat directly to heat lime stone lower than flue gas through upper bush, preheating zone sectional area expands to increase and enters the ratio that preheating zone exhaust gas volumn accounts for total exhaust gas volumn, the obstruction that is conducive to reduce hear rate He delays heat exchanger.
3, preheating zone annular space strengthens, and the lime stone in preheating zone moves more smooth and easy, and the probability that dross is stopped up obviously reduces.
4, after preheating zone annular space increases, increase the capacity of preheating zone unit height lime stone, the while can reduce flue gas by the resistance of the preheating zone bed of material, so SR decline, can reduce accordingly the load of exhaust gas fan.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
1 cloth system, the 4th in figure, kiln shell, the 5th, upper bush, the 6th, lower sleeve, the 9th, upper combustion chamber, 10Shi lower combustion chamber, 12 discharging openings, the 15th, recyclegas entrance, the 17th, cooling-air duct, the 18th, cooling-air endless tube, the 19th, playpipe, the 20th, upper burner, the 21st, lower burner, the 23rd, heat exchanger, the 24th, drives air endless tube, the 25th, and circulation gas channel, F1 are that cooling blower, F2 are that driving blower fan, F3 are exhaust gas fans.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Embodiment mono-
The annular lime kiln of the present embodiment as shown in Figure 1, comprising: kiln shell 1; Be placed in the upper bush 2 with cooling sandwith layer, lower sleeve 3 in kiln shell 1, between described upper bush 2, lower sleeve 3 and kiln shell 1, form circular passage 4; Be placed in the cloth system 5 of 4 upper ends, described circular passage; Be arranged on kiln shell 1 outer circumference and upper combustion chamber 6 and lower combustion chamber 7 spaced apart; Be arranged on the burner 8 of described upper combustion chamber and lower combustion chamber outer end; The outside diameter d of wherein said upper bush 2 is less than the outer diameter D of lower sleeve 3.In the present embodiment, the outside diameter d of upper bush 2 is 70% of lower sleeve 3 outer diameter D.
During annular lime kiln work, come the normal temperature air of self-driven blower fan F1 to enter that heat exchanger 9 is rear is preheated to 450 ℃ by the high-temp waste gas from upper bush 2 bottoms, shown in the driving air of 450 ℃ first enter and drive air endless tube 10 then to send into the interior working fluid as injector of playpipe 11 for injection recyclegas, drive air to enter lower combustion chamber 7 together with recyclegas and participate in burning, the flue gas that burning produces the effect that drives power flow downward and ejector action at injector under from recyclegas import 12, enter lower sleeve 3 inside.Under the effect of lime cooling-air negative pressure in kiln, from kiln bed material storehouse, 13 suctions enter cool lime, and enter lower sleeve 3 inside from lower sleeve 3 recyclegas imports 12.
Under the effect of exhaust gas fan F2, the high-temperature flue gas producing from the part high-temperature flue gas of lower combustion chamber 7 and upper combustion chamber's 6 burnings circular passage 4 interior on flow, at upper bush, 2 places, bottom shunt, part enters exhaust gas fan F2 after entering and entering heat exchanger 9 heat exchange behind upper bush 2 inside, most of circular passage 4 interior on the preheating of flowing by cloth system 1, distribute and enter the lime stone in circular passage 4, then from kiln top exhaust piping, directly enter exhaust gas fan F2.
Because upper bush 2 inner space resistance coefficients are less, after reduced outside diameter, smoke gas flow is less through the pressure loss of upper bush 2 inside, and the impact that the flow that enters heat exchanger waste gas that reduces to cause because of external diameter reduces can be ignored.Because upper bush 2 external diameters reduce, annular space between kiln shell 1 and upper bush 2 is that space, lime stone preheating zone increases, the lime stone flow that enters this space increases, thereby the heat transfer area of preheating zone flue gas and lime stone heat convection expands, heat convection efficiency is strengthened, can effectively utilize the waste heat of waste gas, reduce kiln top flue-gas temperature.Because entering 9 pairs, heat exchanger through upper bush 2, flue gas drive the heat reclaiming after air heat directly to heat lime stone heat used lower than flue gas, preheating zone sectional area expands to increase and enters the ratio that preheating zone exhaust gas volumn accounts for total exhaust gas volumn, the obstruction that is conducive to reduce hear rate He delays heat exchanger 9.Meanwhile, preheating zone annular space strengthens, and the lime stone in preheating zone moves more smooth and easy, and the probability that dross is stopped up obviously reduces.And after the increase of preheating zone annular space, increasing the capacity of preheating zone unit height lime stone, the while can reduce flue gas by the resistance of the preheating zone bed of material, so SR decline, can reduce accordingly the load of exhaust gas fan F2.
Embodiment bis-:
Other structures of the present embodiment are with embodiment mono-, and in the present embodiment, the outside diameter d of upper bush is 75% of lower sleeve outer diameter D.The annular lime kiln of daily output 500t lime of take is example, former design kiln shell diameter 8m, and upper and lower sleeve outer diameter 4.46m, adopts low heat value (1400kCal/Nm
3) in coal gas calcined limestone process, kiln top temperature basic controlling is at 220-230 ℃, ash discharge temperature is within the scope of 100-120 ℃; Upper bush external diameter is reduced to 3.345m, i.e. d=0.75D, when other conditions remain unchanged, kiln top temperature can be controlled within the scope of 150-180 ℃, and ash discharge temperature basic controlling is at 80-100 ℃; The daily output of sleeve kiln is brought up to 550t by 500t simultaneously, overfulfils a production target 10%.
Embodiment tri-:
Other structures of the present embodiment are with embodiment mono-, and in the present embodiment, the outside diameter d of upper bush is 80% of lower sleeve outer diameter D.
Embodiment tetra-:
Other structures of the present embodiment are with embodiment mono-, and in the present embodiment, the outside diameter d of upper bush is 90% of lower sleeve outer diameter D.
Above-mentioned is only description to specific embodiment, and coverage of the present invention is not limited to above-described embodiment, and on the contrary, all technical schemes of falling in fact within the scope of the claims under all instructions on literal or in equivalents are contained in the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (6)
1. an annular lime kiln, comprising:
Kiln shell;
Be placed in the upper bush with cooling sandwith layer, lower sleeve in kiln shell, between described upper bush, lower sleeve and kiln shell, form circular passage;
Be placed in the cloth system of upper end, described circular passage;
Be arranged on kiln shell outer circumference and upper combustion chamber and lower combustion chamber spaced apart;
Be arranged on the burner of described upper combustion chamber and lower combustion chamber outer end;
It is characterized in that: the external diameter of described upper bush is less than the external diameter of lower sleeve.
2. annular lime kiln according to claim 1, is characterized in that: the magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.7～0.9D.
3. annular lime kiln according to claim 2, is characterized in that: the magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.7D.
4. annular lime kiln according to claim 2, is characterized in that: the magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.75D.
5. annular lime kiln according to claim 2, is characterized in that: the magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.8D.
6. annular lime kiln according to claim 2, is characterized in that: the magnitude relationship of the outside diameter d of described upper bush and the outer diameter D of lower sleeve is d=0.9D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410203546.7A CN103940238A (en) | 2014-05-14 | 2014-05-14 | Annular sleeve kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410203546.7A CN103940238A (en) | 2014-05-14 | 2014-05-14 | Annular sleeve kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103940238A true CN103940238A (en) | 2014-07-23 |
Family
ID=51188011
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410203546.7A Pending CN103940238A (en) | 2014-05-14 | 2014-05-14 | Annular sleeve kiln |
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|---|---|
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Citations (8)
| 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 |
| CN2937979Y (en) * | 2006-06-28 | 2007-08-22 | 南京中圣园机电设备有限公司 | Ring-shaped sleeve kiln of burning low heat value gas |
| CN201193927Y (en) * | 2008-01-23 | 2009-02-11 | 南京中圣园机电设备有限公司 | Circular sleeve type kiln waste gas and residual heat utilizing apparatus |
| CN201434585Y (en) * | 2009-07-21 | 2010-03-31 | 宋君成 | Annular shaft opposite burning kiln |
| CN201449130U (en) * | 2009-07-16 | 2010-05-05 | 南京中圣园机电设备有限公司 | Exhaust recirculating calcining kiln |
| CN102072648A (en) * | 2011-01-20 | 2011-05-25 | 江苏中圣园科技股份有限公司 | Flameless combustion annular sleeve kiln |
| CN102620563A (en) * | 2012-04-10 | 2012-08-01 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln capable of realizing flameless combustion |
| CN203848676U (en) * | 2014-05-14 | 2014-09-24 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln |
-
2014
- 2014-05-14 CN CN201410203546.7A patent/CN103940238A/en active Pending
Patent Citations (8)
| 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 |
| CN2937979Y (en) * | 2006-06-28 | 2007-08-22 | 南京中圣园机电设备有限公司 | Ring-shaped sleeve kiln of burning low heat value gas |
| CN201193927Y (en) * | 2008-01-23 | 2009-02-11 | 南京中圣园机电设备有限公司 | Circular sleeve type kiln waste gas and residual heat utilizing apparatus |
| CN201449130U (en) * | 2009-07-16 | 2010-05-05 | 南京中圣园机电设备有限公司 | Exhaust recirculating calcining kiln |
| CN201434585Y (en) * | 2009-07-21 | 2010-03-31 | 宋君成 | Annular shaft opposite burning kiln |
| CN102072648A (en) * | 2011-01-20 | 2011-05-25 | 江苏中圣园科技股份有限公司 | Flameless combustion annular sleeve kiln |
| CN102620563A (en) * | 2012-04-10 | 2012-08-01 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln capable of realizing flameless combustion |
| CN203848676U (en) * | 2014-05-14 | 2014-09-24 | 江苏中圣园科技股份有限公司 | Annular sleeve kiln |
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Application publication date: 20140723 |