CN104864707A - Shaft kiln for calcining loose materials - Google Patents
Shaft kiln for calcining loose materials Download PDFInfo
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- CN104864707A CN104864707A CN201410799818.4A CN201410799818A CN104864707A CN 104864707 A CN104864707 A CN 104864707A CN 201410799818 A CN201410799818 A CN 201410799818A CN 104864707 A CN104864707 A CN 104864707A
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Abstract
The invention relates to a shaft kiln for calcining loose materials. The shaft kiln comprises a hot airflow guiding device which is arranged on the outer side of a kiln body and comprises an air collection device and a power device, and further comprises an upper-layer combustion chamber and a lower-layer combustion chamber, wherein the air collection device is connected with the kin body at the lower part of the lower-layer combustion chamber through a first pipeline; high-temperature air in the kiln body at the lower part of the lower-layer combustion chamber enters the air collection device; combustion air of lower-layer burners guides high-temperature air in the air collection device into the kiln body through the power device; part of the led-in high-temperature air enters the lower-layer combustion chamber to form a parallel-flow calcining zone, and the other part of the led-in high-temperature air forms a contra-flow calcining zone together with hot airflow generated by combustion of upper-layer burners, so that the interior of the kiln is effectively balanced to form in-kiln negative-pressure operation. The shaft kiln for calcining loose materials is simple in structure, can be conveniently manufactured and installed on site, is high in combustion efficiency, can utilize low-heat-value fuels, reduces the investment and the manufacturing cost, meanwhile, can realize production equipment maximization and improves the production capacity.
Description
Technical field
The present invention relates to kiln, more particularly, relate to a kind of roasting shaft kiln of bulk material.
Background technology
At present, be used for the bulk materials such as roasting lime shaft furnace have the MAERZ lime kiln of Switzerland, the sleeve kiln of Germany, gondola oil cooling beam type kiln, high pressure periphery burner gas-burned vertical limekiln and central burner nozzle gas-burned vertical limekiln etc.
MAERZ lime kiln is the lime roasting shaft kiln that Austrian Si meter Te and Huo Foer developed in nineteen fifty-seven, therefore this kiln is also known as Si meter Te-Huo Foer kiln.MAERZ lime kiln is current one of state-of-the-art lime roasting shaft kiln in the world, and this kiln is made up of two identical kiln thoraxes, and during a thorax roasting, another thorax preheating, its major advantage hear rate is low, is generally 850-900x4.3kj/kg, and finished product activity of lime height is 350ml.But the kiln body of MAERZ lime kiln is complicated, and burner arranges too much, easy burn-out, and equipment is many, investment is large, and power consumption is high.
Gondola oil cooling beam type shaft furnace is also Fu Kasi kiln, and this kiln arranges several and inserts in kiln with the oil cooled beam of heat conduction, and under the protection of beam, several burners reach in kiln and carry out roasting to material in material, therefore this kiln also claims beam type kiln.The operation of this kiln advantage is comparatively simple, and Product Activity degree is greater than 330ml, but burner arranges many, beam easy burn-out, and beam cost is high, and product hear rate is higher, is greater than 1200x4.3kj/kg.
The nineties in last century, China have developed periphery burner gas-burned vertical limekiln, and this kiln is provided with multiple high-pressure gas burner at its periphery, and under high pressure, flame sprays in material and carries out roasting.Gas-burned vertical limekiln kiln body is simple, and easy to operate, cost is low, and activity of lime can reach more than 310ml, but its hear rate is high, and especially use during blast furnace gas and reach more than 1500x3kj/kg, in kiln, section temperature is uneven.This kiln can only use gaseous fuel, and fuel tolerance is very little.
Central burner nozzle gas-burned vertical limekiln is the gas combusting limestone kiln of the development beginning of this century, a burner is established at the gas-burned vertical limekiln center that this kiln is using at present, to solve the uneven problem of material section temperature, makes gas-burned vertical limekiln section temperature in kiln more even, but central burner nozzle complex structure, not easily changes.Other pluses and minuses of central burner nozzle gas-burned vertical limekiln are the same with gas-burned vertical limekiln.
Double shell shaft kiln is the lime roasting shaft kiln that German Ka Er and Beckenbach were developed in nineteen sixty, therefore this kiln is also known as Ka Er-Beckenbach kiln.Sleeve kiln is current one of state-of-the-art lime roasting shaft kiln in the world, and this kiln is made up of two circular concentric kiln thoraxes, the in-built materials of sleeve of two circular compositions, and inner circle walks the waste gas of cooling-air and fuel combustion generation.Roasting band is half inverse half same flow operation, preheating zone is counter-current operation.Its major advantage hear rate is low, is generally 950x4.3kj/kg, and finished product activity of lime is at more than 330ml.But the kiln body of double shell shaft kiln is very complicated with operation, investment is large, and power consumption is high.As shown in Figure 1, the kiln thorax of cylindrical is made up of steel construction kiln shell 2' and outer ring kiln lining 1' the partial structurtes of double shell shaft kiln, and inner sleeve protects the 6' of resistance to material to form by inner sleeve 3', inner sleeve supporting member 5' and supporting member under inner ring kiln lining 4', interlayer.Under interlayer, inner sleeve 3' and inner sleeve supporting member 5' must adopt the heat-resisting steels of the high trade mark to make, and the accuracy of manufacture requires high, and production cost is high.Under interlayer, inner sleeve 3' and inner sleeve supporting member 5' is in hot environment, for preventing temperature too high, need pass into cooling air cooling, can cause to a certain degree energy loss like this in inner sleeve 3' under interlayer and inner sleeve supporting member 5'.In roasting process, the blower fan passing into cooling air under interlayer in inner sleeve 3' and inner sleeve supporting member 5' need adopt emergency power supply, otherwise, once the great device security accident that power-off stops sending cooling air to cause inner sleeve 3' and inner sleeve supporting member 5' under interlayer to produce distortion because of high temperature.The maximum production capacity of double shell shaft kiln is 600t/ days, if the diameter of inner sleeve 3' under the kiln thorax that continuing enhances production capacities must increase cylindrical and interlayer simultaneously, under causing interlayer like this, inner sleeve 3' cannot transport, and therefore wants the production capacity expanding double shell shaft kiln very difficult.It is inner that existing inner sleeve is positioned at kiln body, if inner sleeve is damaged, cannot overhaul at all, and whole shaft furnace will face the risk of paralysing and scrapping.
Summary of the invention
The technical problem to be solved in the present invention is, the complex structure existed for existing roasting shaft kiln, low calorie fuels cannot be used, and making in site difficulty is large, be difficult to the problem realizing the maximization of roasting shaft kiln production capacity, there is provided a kind of structure relatively simple, facilitate making in site to install, and the roasting shaft kiln of the bulk material of low calorie fuels can be used.
The technical solution adopted for the present invention to solve the technical problems is: the roasting shaft kiln constructing a kind of bulk material, comprise the thermal current guiding device being arranged on the external side of kiln, described thermal current guiding device comprises gas collecting apparatus and power set, roasting shaft kiln also comprises the combustion chamber, upper strata and lower floor combustion chamber that are arranged on kiln body inside, described upper strata arranges upper strata burner in combustion chamber, described lower floor arranges lower floor's burner in combustion chamber, fuel air mixture enters in kiln body by upper strata burner and lower floor's burner, described gas collecting apparatus is connected with the kiln body of bottom, described lower floor combustion chamber by the first pipeline, high-temperature gas in the kiln body of bottom, lower floor combustion chamber enters gas collecting apparatus, the combustion air of lower floor's burner is through entering in kiln body by power set by the high-temperature gas guiding in gas collecting apparatus, a part for the high-temperature gas introduced enters lower floor combustion chamber and is formed and flow burning zone, the thermal current that another part and upper strata burner combustion produce forms adverse current burning zone, make the preheating zone in kiln, roast area, cooling zone reaches active balance, form negative-pressure operation in kiln.
In such scheme, also comprise the external circulating current heat-exchanger rig being arranged on the external side of kiln, described external circulating current heat-exchanger rig is connected with the kiln body on top, combustion chamber, described upper strata by the second pipeline, the outside of kiln body is provided with the air heat exchanger be connected with combustion fan and the gas change heater be connected with coal gas pipe valve, and the high-temperature gas in the kiln body on top, combustion chamber, described upper strata is entered in air heat exchanger and gas change heater by the second pipeline and external circulating current heat-exchanger rig successively.
In such scheme, described gas change heater also connects sack cleaner, main smoke discharging blower fan and chimney successively, and described upper strata top of combustion chamber is also provided with the gas vent be connected with described sack cleaner.
In such scheme, described power set are injector or high-temperature blower.
In such scheme, described upper strata burner and lower floor's burner are evenly provided with multiple, and upper strata burner and lower floor's burner shift to install.
In such scheme, the cross section of described kiln body is fan-shaped, and multiple fan-shaped kiln body is centered by the thermal current guiding device of external, and uniform ring is around being arranged in outside it.
In such scheme, the cross section of described kiln body is U-shaped, and the thermal current guiding device of described external is positioned at U-shaped kiln body inside.
In such scheme, the cross section of described kiln body is rectangle, and two rectangle kiln bodies are symmetricly set on the both sides of the thermal current guiding device of external.
Implement the roasting shaft kiln of bulk material of the present invention, there is following beneficial effect:
1, the combustion air of lower floor's burner is through entering in kiln by power set by the high-temperature gas guiding in gas collecting apparatus, and a part is formed and flows burning zone, and another part forms adverse current burning zone.The effect of material through the top of combustion chamber, upper strata and lower floor combustion chamber allows material roll full and uniform roasting.The present invention greatly improves the treatment effeciency of the roasting shaft kiln of bulk material by arranging thermal current guiding device, therefore the fuel scope of application is wide, can use solid fuel, liquid fuel and gaseous fuel, the particularly use of low-calorie fuel, can reach the product quality of other kinds advanced roasting shaft kiln kiln type equally.
2, the structure relative simplicity of thermal current guiding device and kiln body, facilitates making in site to install, and reduces the difficulty of refractory material laying simultaneously, and thermal current guiding device can adopt lower resistance to material kind and common iron, reduces cost of investment.
3, because thermal current guiding device is positioned at outside kiln body, convenient maintenance or replacing, and can by multiple kiln body centered by external thermal current guiding device, can be formed and to be arranged symmetrically with or trisection is fan-shaped and above decile arranged in form, thus realize the maximization of production equipment, improve production capacity.
4, the structure of thermal current guiding device simplifies and is arranged on after outside kiln body, eliminates the cooling air system of operator guards part and the emergency power supply system of cooling air system, thus reduces cost of investment and run production cost, enhances the security of apparatus.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the partial structurtes schematic diagram of prior art middle sleeve formula shaft furnace;
Fig. 2 is the structural representation of the roasting shaft kiln of bulk material of the present invention;
The schematic diagram of Tu3Shi lower floor burner;
The schematic diagram of Tu4Shi lower floor burner;
Fig. 5 a-Fig. 5 c is three kinds of arrangement schematic diagrames of fan-shaped kiln body;
Fig. 6 is the arrangement schematic diagram of rectangular kiln body;
Fig. 7 is the arrangement schematic diagram of U-shaped kiln body.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in figs 2-4, the roasting shaft kiln of bulk material of the present invention comprises thermal current guiding device 2, combustion chamber, upper strata 5 and lower floor combustion chamber 4, and wherein thermal current guiding device 2 is positioned at outside kiln body 1, and it is inner that combustion chamber, upper strata 5 and lower floor combustion chamber 4 are positioned at kiln body 1.Thermal current guiding device 2 comprises gas collecting apparatus 2.1 and power set 2.2.
Arrange upper strata burner 7 in combustion chamber, upper strata 5, arrange lower floor's burner 6 in lower floor combustion chamber 4, fuel air mixture is entered in kiln body 1 by upper strata burner 7 and lower floor's burner 6.Upper strata burner 7 and lower floor's burner 6 are evenly provided with multiple, and upper strata burner 7 and lower floor's burner 6 shift to install.
Gas collecting apparatus 2.1 is connected with lower floor combustion chamber 4 by the first pipeline 8, and the first pipeline 8 in the present embodiment is the gas channels between the kiln body 1 of bottom, lower floor combustion chamber 4 and gas collecting apparatus 2.1.High-temperature gas in the kiln body 1 of bottom, lower floor combustion chamber 4 enters gas collecting apparatus 2.1 by the first pipeline 8.The combustion air of lower floor's burner 6 is through producing negative pressure by power set 2.2, again being guided by high-temperature gas in gas collecting apparatus 2.1 enters in kiln body 1, a part enters lower floor combustion chamber 4 downwards and is formed and flow burning zone, another part upwards enters combustion chamber, upper strata 5, adverse current burning zone is formed with upper strata burner 7 thermal current produced that burns, make the preheating zone in kiln body 1, roast area, cooling zone reach active balance, form negative-pressure operation in kiln.Power set 2.2 can be injector or high-temperature blower, are preferably injector.In a preferred embodiment, the top of combustion chamber, upper strata 5 and lower floor combustion chamber 4 is arch.The effect of material through the top of combustion chamber, upper strata 5 and lower floor combustion chamber 4 allows material roll full and uniform roasting, and the material after roasting is discharged bottom kiln body 1.Upper strata burner 7 and lower floor's burner 6 shift to install, and can further improve the effect of material rolling roasting.The present invention greatly improves the treatment effeciency of the roasting shaft kiln of bulk material by the thermal current guiding device 2 arranging external, therefore the fuel scope of application is wide, can use solid fuel, liquid fuel and gaseous fuel, the particularly use of low-calorie fuel, can reach the product quality of other kinds advanced roasting shaft kiln kiln type equally.
Further, the roasting shaft kiln of the present embodiment bulk material also comprises external circulating current heat-exchanger rig 3, external circulating current heat-exchanger rig 3 is connected by the kiln body 1 of the second pipeline 9 with top, combustion chamber, upper strata 5, and the outside of kiln body 1 is provided with the air heat exchanger 11 be connected with combustion fan 13 and the gas change heater 12 be connected with coal gas pipe valve 14.High-temperature gas in top, combustion chamber, upper strata 5 kiln body 1 enters in air heat exchanger 11 and gas change heater 12 by the second pipeline 9 and external circulating current heat-exchanger rig 3 successively, utilize high-temperature gas to carry out preheating to air and fuel, improve the efficiency of combustion of mist.
Through a part of combustion air as upper strata burner 7 of air that air heat exchanger 11 heats, another part is as the guiding wind of power set 2.2.Owing to there is thermal loss, when the air that air heat exchanger 11 heats enters the combustion-supporting chamber of combustion chamber, upper strata 5, its temperature is generally 300 ~ 400 DEG C, and the hot-gas temperature in the thermal current guiding device 2 that power set 2.2 are introduced is 700 ~ 800 DEG C, greatly improves efficiency of combustion.Pass into outside air in the present embodiment bottom kiln body 1, improve the oxygen content of the high-temperature gas in thermal current guiding device 2.
Further, gas change heater 12 also connects sack cleaner 15, main smoke discharging blower fan 16 and chimney 17 successively, and top, combustion chamber, upper strata 5 is also provided with the gas vent 10 be connected with sack cleaner 15.Flue gas in combustion chamber, upper strata 5 is discharged from chimney 17 after dust removal process.
Further, the section of thermal current guiding device 2 of the present invention can be the various shape such as circle, ellipse, polygon, and it is placed in outside kiln body 1, can have multiple arrangement:
As shown in Fig. 5 a-Fig. 5 c, the cross section of kiln body 1 is fan-shaped.Kiln body 1 can be one, two or more.Two fan-shaped kiln bodies 1 are symmetrical centered by thermal current guiding device 2, and multiple fan-shaped kiln body 1 is centered by thermal current guiding device 2, and uniform ring is around being arranged in outside it.
As shown in Figure 6, the cross section of kiln body 1 is rectangle, and two rectangle kiln bodies 1 are symmetricly set on the both sides of thermal current guiding device 2.
As shown in Figure 7, the cross section of kiln body 1 is U-shaped, and thermal current guiding device 2 is positioned at the inner side of U-bend.
The arrangement of kiln body 1 of the present invention is various, is easy to the maximization realizing production capacity, facilitates making in site to install, and reduces the difficulty of refractory material laying simultaneously, adopts lower resistance to material kind and common iron, reduces cost of investment.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (8)
1. the roasting shaft kiln of a bulk material, it is characterized in that, comprise the thermal current guiding device (2) being arranged on kiln body (1) outside, described thermal current guiding device (2) comprises gas collecting apparatus (2.1) and power set (2.2), roasting shaft kiln also comprises the combustion chamber, upper strata (5) and lower floor combustion chamber (4) that are arranged on kiln body (1) inside, upper strata burner (7) is set in combustion chamber, described upper strata (5), described lower floor arranges lower floor's burner (6) in combustion chamber (4), fuel air mixture enters in kiln body (1) by upper strata burner (7) and lower floor's burner (6), described gas collecting apparatus (2.1) is connected with the kiln body (1) of described lower floor combustion chamber (4) bottom by the first pipeline (8), high-temperature gas in the kiln body (1) of lower floor combustion chamber (4) bottom enters gas collecting apparatus (2.1), the combustion air of lower floor's burner (6) is through entering in kiln body (1) by power set (2.2) by the high-temperature gas guiding in gas collecting apparatus (2.1), a part for the high-temperature gas introduced enters lower floor combustion chamber (4) and is formed and flow burning zone, another part and upper strata burner (7) thermal current produced that burns forms adverse current burning zone.
2. the roasting shaft kiln of bulk material according to claim 1, it is characterized in that, also comprise the external circulating current heat-exchanger rig (3) being arranged on kiln body (1) outside, described external circulating current heat-exchanger rig (3) is connected with the kiln body (1) on combustion chamber, described upper strata (5) top by the second pipeline (9), the outside of kiln body (1) is provided with the air heat exchanger (11) be connected with combustion fan (13) and the gas change heater (12) be connected with coal gas pipe valve (14), high-temperature gas in the kiln body (1) on combustion chamber, described upper strata (5) top is entered in air heat exchanger (11) and gas change heater (12) by the second pipeline (9) and external circulating current heat-exchanger rig (3) successively.
3. the roasting shaft kiln of bulk material according to claim 2, it is characterized in that, described gas change heater (12) also connects sack cleaner (15), main smoke discharging blower fan (16) and chimney (17) successively, and combustion chamber, described upper strata (5) top is also provided with the gas vent (10) be connected with described sack cleaner (15).
4. the roasting shaft kiln of bulk material according to claim 1, is characterized in that, described power set (2.2) are injector or high-temperature blower.
5. the roasting shaft kiln of bulk material according to claim 1, it is characterized in that, described upper strata burner (7) and lower floor's burner (6) are evenly provided with multiple, and upper strata burner (7) and lower floor's burner (6) shift to install.
6. the roasting shaft kiln of bulk material according to claim 1, it is characterized in that, the cross section of described kiln body (1) is fan-shaped, and multiple fan-shaped kiln body (1) is centered by the thermal current guiding device (2) of external, and uniform ring is around being arranged in outside it.
7. the roasting shaft kiln of bulk material according to claim 1, is characterized in that, the cross section of described kiln body (1) is U-shaped, and the thermal current guiding device (2) of described external is positioned at U-shaped kiln body (1) inside.
8. the roasting shaft kiln of bulk material according to claim 1, it is characterized in that, the cross section of described kiln body (1) is rectangle, and two rectangle kiln bodies (1) are symmetricly set on the both sides of the thermal current guiding device (2) of external.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410799818.4A CN104864707A (en) | 2014-12-19 | 2014-12-19 | Shaft kiln for calcining loose materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410799818.4A CN104864707A (en) | 2014-12-19 | 2014-12-19 | Shaft kiln for calcining loose materials |
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| Publication Number | Publication Date |
|---|---|
| CN104864707A true CN104864707A (en) | 2015-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410799818.4A Pending CN104864707A (en) | 2014-12-19 | 2014-12-19 | Shaft kiln for calcining loose materials |
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| Country | Link |
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| CN (1) | CN104864707A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118310309A (en) * | 2024-06-05 | 2024-07-09 | 辽宁鑫泰钼业有限公司 | Molybdenum concentrate two-section roasting device |
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|---|---|---|---|---|
| GB990521A (en) * | 1960-12-30 | 1965-04-28 | Polysius Gmbh | Improvements in or relating to the burning and sintering of cement and similar substances, and shaft furnaces therefor |
| CN86103744A (en) * | 1985-05-29 | 1986-12-17 | 戴维·D·达格罗萨 | The method for calcinating of solid materials and used single column calcining furnace thereof |
| CN2545553Y (en) * | 2002-05-29 | 2003-04-16 | 于国强 | Light-burned magnesia kiln |
| CN2745012Y (en) * | 2004-11-04 | 2005-12-07 | 程万钢 | Heat accumulation type calcinations vertical kiln |
| CN2916548Y (en) * | 2006-01-13 | 2007-06-27 | 上海嘉德环境能源科技有限公司 | Double-chamber annular shaft kiln |
| CN203007148U (en) * | 2012-12-25 | 2013-06-19 | 石家庄新华能源环保科技股份有限公司 | Low-heat-value fuel lime kiln |
| CN204329602U (en) * | 2014-12-19 | 2015-05-13 | 武汉艾蒙窑炉技术有限公司 | The roasting shaft kiln of bulk material |
-
2014
- 2014-12-19 CN CN201410799818.4A patent/CN104864707A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB990521A (en) * | 1960-12-30 | 1965-04-28 | Polysius Gmbh | Improvements in or relating to the burning and sintering of cement and similar substances, and shaft furnaces therefor |
| CN86103744A (en) * | 1985-05-29 | 1986-12-17 | 戴维·D·达格罗萨 | The method for calcinating of solid materials and used single column calcining furnace thereof |
| CN2545553Y (en) * | 2002-05-29 | 2003-04-16 | 于国强 | Light-burned magnesia kiln |
| CN2745012Y (en) * | 2004-11-04 | 2005-12-07 | 程万钢 | Heat accumulation type calcinations vertical kiln |
| CN2916548Y (en) * | 2006-01-13 | 2007-06-27 | 上海嘉德环境能源科技有限公司 | Double-chamber annular shaft kiln |
| CN203007148U (en) * | 2012-12-25 | 2013-06-19 | 石家庄新华能源环保科技股份有限公司 | Low-heat-value fuel lime kiln |
| CN204329602U (en) * | 2014-12-19 | 2015-05-13 | 武汉艾蒙窑炉技术有限公司 | The roasting shaft kiln of bulk material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118310309A (en) * | 2024-06-05 | 2024-07-09 | 辽宁鑫泰钼业有限公司 | Molybdenum concentrate two-section roasting device |
| CN118310309B (en) * | 2024-06-05 | 2024-08-06 | 辽宁鑫泰钼业有限公司 | Molybdenum concentrate two-section roasting device |
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Application publication date: 20150826 |
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