CN201885553U - Energy-saving efficiency-improving rotary kiln with double temperature fields - Google Patents

Energy-saving efficiency-improving rotary kiln with double temperature fields Download PDF

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Publication number
CN201885553U
CN201885553U CN2010206478137U CN201020647813U CN201885553U CN 201885553 U CN201885553 U CN 201885553U CN 2010206478137 U CN2010206478137 U CN 2010206478137U CN 201020647813 U CN201020647813 U CN 201020647813U CN 201885553 U CN201885553 U CN 201885553U
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CN
China
Prior art keywords
temperature
rotary kiln
combustion
preheater
kiln
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Expired - Fee Related
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CN2010206478137U
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Chinese (zh)
Inventor
刘显龙
蔺江宁
郭任哲
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ANSHAN HUAJIE BUILDING MATERIAL TECHNOLOGY DEVELOPMENT Co Ltd
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ANSHAN HUAJIE BUILDING MATERIAL TECHNOLOGY DEVELOPMENT Co Ltd
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Abstract

An energy-saving efficiency-improving rotary kiln with double temperature fields solves the problems of excessive kiln scale, low heat efficiency, high energy consumption, poor preheating and the like in the prior art, and comprises a rotary kiln, a cooler, a preheater, a kiln heat combustor, an internal combustor and the like. The energy-saving efficiency-improving rotary kiln is technically characterized in that fuel is proportionally distributed to the two temperature fields, combustion air and first temperature field fuel are mixed with secondary air for combustion via the kiln head combustor after heat exchange and temperature rise of the secondary air are realized by the aid of the cooler, so that the first temperature field for secondary roasting of materials in the kiln is realized, and a part of the secondary air which passes through a second temperature field combustion air pipe after heat exchange and temperature rise of the secondary air are realized by the aid of the cooler (or the secondary air is supplied by an auxiliary combustion air supply system) and second temperature field fuel passing through a second temperature field fuel pipe are sprayed into the preheater for combustion via the internal combustor, so that the second temperature field for primary roasting of materials in the preheater is realized. Compared with existing equipment and process, the energy-saving efficiency-improving rotary kiln has the advantages of scientific and reasonable distribution of a heat source, small occupied space, high heat efficiency, low energy consumption, fine preheating effect and capability of improving yield and quality of products.

Description

Energy efficiency type two temperature field rotary kiln
Technical field
The utility model relates to a kind of shape material roasting apparatus of being made up of preheater, rotary kiln, cooler, kiln hood burner, built-in combustion device, particularly a kind of energy efficiency type two temperature field rotary kiln that is mainly used in lump materials such as roasting active lime, light dolomite, magnesite, bauxite.This equipment is particularly suitable for the production line of production capacity greater than 1000t/d, is the optimal selection of unit maximization production line.
Background technology
At present, the rotary kiln baking equipment of forming by shaft preheater, rotary kiln, shaft cooler of widespread usage in the lump material roasting process such as active lime, light dolomite, magnesite, bauxite, become the disseminate technology of energy-saving active lime production operation, and on some documents, also made report.As patent publication No. is " coal dust injects the method and the burner of rotary kiln and produces the method and apparatus of CaO " of CN1753843A and " a kind of calcined dolomite production machine " that patent publication No. is CN101659522A etc., wherein, the former provides by using coal dust to produce the method and apparatus of lime, the latter provides and has adopted efficient preheater, can utilize kiln tail high-temperature flue gas that material is carried out preheating, and then enter calcined by rotary kiln, the waste heat of high-temperature flue gas is fully used.The document that also has has proposed corresponding improvement respectively to the defective that devices such as the shaft preheater in the existing rotary kiln baking equipment, rotary kiln, shaft cooler exist, and makes this top technology ripe more.The material that the applicant just once existed at existing shaft preheater is heated inhomogeneous, flowing resistance is big and inhomogeneous, local dead band crust, the heat exchange state such as can not adjust at problem, designing a kind of patent publication No. is CN101382392A " calandria preheater ", advantages such as it has reliable, and hot gas is evenly distributed, material is heated evenly, material integral body moves down no dead band, material operation is unobstructed, the even wind partially of resistance in the flue gas process of circulation, and exhaust gas temperature in service is adjustable.But in the lump material rotary kiln baking equipment such as existing all active limes, light dolomite, magnesite, bauxite, thermal source is just supplied with by multicenter combustor one place that is arranged on rotary kiln end.This multicenter combustor is the thermal source of material roasting in the rotary kiln, it is again the thermal source of kiln tail shaft preheater material preheating, show slightly the under-supply and thermal source irrational distribution of heat energy, the thermal efficiency is low, main cause is that the thermal source of kiln tail preheater is provided by the multicenter combustor that is arranged on kiln hood, the hot flue gas that multicenter combustor produces, be delivered to shaft preheater by rotary kiln, the problem of existence mainly comprises the following aspects:
1. owing to be subjected to the restriction of kiln tail exhaust outlet high-temperature flue gas by speed, rotary kiln output is big more, and its diameter is big more, the kiln body is long more simultaneously, thereby occupation space is just many more, thereby has increased equipment cost;
2. the kiln body diameter of rotary kiln and kiln body length increase, and kiln body heat radiation increase, the thermal efficiency are reduced;
3. the kiln body diameter of rotary kiln and kiln body increase, and the rotary kiln drive power required is increased, and power consumption increases;
4. hot flue gas is delivered to the process of kiln tail from kiln hood, and temperature descends 300 ~ 500 ℃, makes into the heat energy of the pre-thermal material of preheater obviously not enoughly, has a strong impact on the pre-heat effect of material in the preheater and the output and the product quality of rotary kiln.
Summary of the invention
The purpose of this utility model provides a kind of energy efficiency type two temperature field rotary kiln, the kiln scale that exists in the solution prior art is excessive, heat source configurations is unreasonable, the thermal efficiency is low, problem such as energy consumption height, preheating are low, compare with same category of device, its heat source configurations distribution science, reasonable occupies little space thermal efficiency height, pre-heat effect is good, has improved rotary kiln output and product quality significantly.
The technical scheme that the utility model adopted is: the energy efficiency type two temperature field rotary kiln of employing, comprise rotary kiln, be arranged on rotary kiln end multicenter combustor and cooler, be arranged on the preheater of rotary kiln, its technical essential is: the built-in combustion device is set in described preheater, be provided with the second temperature field fuel conduit and the second temperature field combustion air pipeline at described rotary kiln afterbody, the described second temperature field fuel conduit, one end links to each other with described built-in combustion device, and the other end links to each other with the described second temperature field fuel system; Described second temperature field combustion air pipeline one end links to each other with described built-in combustion device, and the other end links to each other with cooler that is arranged on rotary kiln end or auxiliary combustion air air feed system.
The described multicenter combustor that is connected with the first temperature field fuel system with wind air feed system, after combustion air and fuel fully mixed, infiltrate the row burning with described cooler through the combustion-supporting wind facies of secondary of heat exchange intensification again, as first temperature field of supplying with the material after baking, fuel used 30 ~ 70% of the total amount of fuel that accounts for; Described preheater adopts the tubulation preheater that has the built-in combustion device, described built-in combustion device is connected with the second temperature field fuel conduit with the described second temperature field combustion air pipeline, to heat up after the secondary combustion air of output and fuel fully mixes through described cooler heat exchange, spray into described tubulation preheater internal combustion, as second temperature field of supplying with material bakes to burn the article in described tubulation preheater, fuel used 70 ~ 30% of the total amount of fuel that accounts for.
The described calandria preheater top that has the built-in combustion device is a feed bin, a plurality of independently feed pipes evenly distribute along described feed bin bottom circumference respectively, described feed pipe bottom has the shell and tube of independent exhaustion pipe preheating chamber to link to each other with having, in described shell and tube preheating chamber bottom, the center of being provided with goes out feed bin, go out feed bin at described center and over against the discharging opening place of described shell and tube preheating chamber material-pulling device is set, the bottom that described center goes out feed bin is communicated with rotary kiln by transfer slide and sealing device.
Described built-in combustion device is arranged on the outer wall of described preheating chamber.
Described built-in combustion device is arranged on the sidewall of described transfer slide.
Described built-in combustion device is arranged on the center that described center goes out the top of feed bin.
Advantage and the good effect that the utlity model has are: since the utility model be produce on the basis of cooking technique at the existing energy-saving active lime of forming by shaft preheater, rotary kiln, shaft cooler improved, so be easy to realization.It carries out the distribution of science according to the thermochemical process of material in whole system with the roasting heat source structure of material, is about to fuel and adopts the appropriate design scheme that is divided into two, and realizes the purpose of the utility model task.
At first by adopting the distribution of heat source configurations of setting up the process improving material roasting of built-in burner at rotary kiln.The design that employing is divided into two fuel is about to fuel and is assigned as the first temperature field fuel and the second temperature field fuel.The primary air and the first temperature field fuel are after the kiln hood burner of described rotary kiln end mixes, with the secondary combustion air mixed combustion after described cooler heat exchange intensification, as first temperature field of supplying with material after baking in described rotary kiln.Make material in rotary kiln, finish roasting process for the second time.So just reduce the hot exhaust gas volumn of the generations such as fuel combustion in the rotary kiln, reduced its space shared in rotary kiln.Help reducing rotary kiln body diameter, thereby reach the purpose that reduces the radiation loss of rotary kiln body and improve the rotary system thermal efficiency.The secondary combustion air of part after described cooler heat exchange heats up (or the combustion air that is provided by auxiliary combustion air air feed system) sprays into described preheater internal combustion by the second temperature field combustion-aid air pipe and the second temperature field fuel by the second temperature field cartridge through the described built-in combustion device that is arranged on rotary kiln, as second temperature field of supplying with material bakes to burn the article in described preheater, so, preheater is interior except that the hot flue gas of first temperature field by the rotary kiln conveying of accepting the rotary kiln supply, utilize newly-installed built-in combustion device as the second temperature field thermal source, for carrying out finishing in the heat exchange for the first time roasting process in preheater, material created good condition, thereby improved the resolution ratio of material in preheater, reduced the rotary kiln body length, reached and reduced the radiation loss of kiln body, improved the rotary system thermal efficiency, the purpose of output and product quality.
Next adopts the applicant's patented technology of " calandria preheater " of successful Application (patent publication No. is CN101382392A), and the built-in combustion device is set in calandria preheater.Improve the ability that calandria preheater utilizes the waste heat of elevated temperature heat flue gas, significantly increase the predecomposition ability of preheater, thereby significantly improve the output and the product quality of rotary kiln.
Therefore, the utility model has solved fundamentally that the kiln body specification that prior art exists is big, the thermal efficiency is low, problems such as big energy-consuming, pre-heat effect difference.Practice examining proves, is example to produce lime, and it is compared with the lime rotary kiln calciner of same specification, and output can improve 50 ~ 80%; Energy-conservation 35 ~ 50%; The finished product activity degree improves 30 ~ 50ml.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is a kind of concrete structure schematic diagram of the present utility model.
Fig. 2 is the I type structural representation of a kind of preheater among Fig. 1.
Fig. 3 is the II type structural representation of a kind of preheater among Fig. 1.
Fig. 4 is the III type structural representation of a kind of preheater among Fig. 1.
Sequence number explanation among the figure:
1 feed bin, 2 feed pipes, 3 preheating chambers, 4 transfer slides, 5 sealing devices, 6 blast pipes, 7 centers go out feed bin, 8 material-pulling devices, 9 built-in combustion devices, 10 preheaters, 11 refractory materials, 12 rotary kilns, 13 coolers, 14 secondary wind air feed systems, 15 wind air feed systems, 16 multicenter combustors, 17 second temperature field combustion air pipelines, 18 second temperature field fuel conduits, 19 first temperature field fuel systems, 20 second temperature field fuel systems, 21 raw material supply systems, 22 finished product induction systems, 23 smoke processing systems, 24 auxiliary combustion air air feed systems, 25 control valves.
The specific embodiment
Describe concrete structure of the present utility model in detail according to Fig. 1~4.This energy efficiency type two temperature field rotary kiln is improved on the basis of the mature technology of the existing energy-saving active lime rotary kiln of being made up of shaft preheater, rotary kiln, shaft cooler, preheater can adopt the applicant the patent publication No. of successful Application be " calandria preheater " patented technology of CN101382392A.Energy efficiency type two temperature field rotary kiln comprises rotary kiln (comprising its auxiliary device) 12, be arranged on the multicenter combustor 16 and the cooler 13 of rotary kiln 12 kiln hoods, be arranged on the preheater that has built-in combustion device 9 10 of rotary kiln 12 kiln tails, a wind air feed system 15, secondary wind air feed system 14, the first temperature field fuel system 19, the second temperature field fuel system 20, the second temperature field cartridge 18, the second temperature field combustion-aid air pipe 17, raw material supply system 21, finished product induction system 22, smoke processing system 23, auxiliary combustion air air feed system 24 compositions such as grade.Wherein the control valve 25 of rotary kiln 12, cooler 13 and multicenter combustor 16, preheater 10 and the secondary combustion air that heats up through cooler 13 heat exchange is the common apparatus that adopts prior art to make, and its specification, model should be selected according to actual instructions for use.The second temperature field fuel conduit 18 is set and the second temperature field combustion air pipeline, 17, the second temperature field fuel conduits, 18 1 ends link to each other with built-in combustion device 9 at the rotary kiln afterbody, the other end links to each other with the second temperature field fuel system.Second temperature field combustion air pipeline 17 1 ends link to each other with built-in combustion device 9, and the other end links to each other by the outlet and the auxiliary combustion air air feed system 24 of the secondary combustion air that the control valve 25 and the heat exchange of the cooler 13 that is arranged on rotary kiln 12 kiln hoods heat up.Cooler 13 is connected with auxiliary air air feed system 14, be discharged into finished product induction system 22 after the secondary combustion air cooling that the high-temperature material that rotary kiln 12 generates is blown into by the secondary air feed system in cooler 13, be warming up to about 600 ~ 700 ℃ through secondary combustion air high-temperature material heat exchange in cooler 13 that secondary air feed system 14 is blown into, connect the second temperature field combustion-aid air pipe 17 by control valve 25.
The multicenter combustor 16 that is arranged on rotary kiln 12 kiln hoods is connected with the first temperature field fuel system 19 with an air feed system 15, the combustion air that air feed system 15 is blown into by multicenter combustor 16 and after the fuel that the first temperature field fuel system 19 provides fully mixes, infiltrate the row burning with the secondary combustion air after cooler 13 heat exchange intensification again, as first temperature field of supplying with material after baking in rotary kiln 12.Fuel used 30 ~ 70% of the total amount of fuel that accounts in first temperature field.Preheater 10 in the present embodiment adopts the tubulation preheater that has built-in combustion device 9.The built-in combustion device 9 that is arranged on rotary kiln 12 kiln tails is connected with an end of the second temperature field cartridge 18, the second temperature field combustion air pipeline 17.The other end of the second temperature field fuel conduit 18 is connected with the second temperature field fuel system 20, and the other end of the second temperature field combustion air pipeline 17 is connected with auxiliary combustion air air feed system 24 or cooler 13.To heat up after the secondary combustion air of output and fuel fully mixes through cooler 13 heat exchange, spray into tubulation preheater internal combustion by built-in combustion device 9, as second temperature field of supplying with material bakes to burn the article in the tubulation preheater, fuel used 70 ~ 30% of the total amount of fuel that accounts for.
The structure of the preheater 10 in the present embodiment is basic identical with the structure of " calandria preheater (patent publication No. is CN101382392A) ".Its specification, model should be selected according to the requirement of the actual production capacity of rotary kiln 12.It is mainly gone out parts such as feed bin 7, material-pulling device 8 and built-in combustion device 9 and forms by feed bin 1, feed pipe 2, preheating chamber 3, transfer slide 4, sealing device 5, blast pipe 6, center.Preheater 10 in the present embodiment is provided with the difference of position by built-in combustion device 9, can be made into different version.Being provided with as built-in combustion device 9 on the housing of preheating chamber 3, then is I type structure, as shown in Figure 2.Built-in combustion device 9 is arranged on the sidewall of transfer slide 4, then is II type structure, as shown in Figure 3.As shown in Figure 4, built-in combustion device 9 is arranged on the center and goes out the feed bin top center, then is III type structure etc.Wherein feed bin 1 has guaranteed to be full of material in the feed pipe 2 in buffering raw material supply system 21 supply materials, promptly guarantees the material envelope effect of feed pipe 2.A plurality of independently feed pipes 2 evenly distribute along feed bin 1 bottom circumference respectively, when evenly adding the material in the feed bin 1 in the preheating chamber 3, the flue gas in the preheating chamber 3 are played the effect of material envelope.The below of the preheating chamber that has independent exhaustion pipe 63 that is communicated with feed pipe 2, the center of setting goes out feed bin 7.The hot flue gas that imports into from rotary kiln 12 kiln tails is after the center goes out feed bin 7 finish heat exchange and decomposable process in preheating chamber 3, and self temperature significantly reduces, and the flue gas after the cooling enters smoke processing system by blast pipe 6.Go out feed bin 7 at the center and over against the discharging opening place of preheating chamber 3 material-pulling device 8 is set, the bottom that the center goes out feed bin 7 is communicated with rotary kiln 12 by transfer slide 4 and sealing device 5.The material that preheating and part are decomposed is under the effect of material-pulling device 8 and gravity, in transfer slide 4 enters rotary kiln 12.Sealing device 5 is attaching parts of transfer slide 4 and rotary kiln 12, when realizing transfer slide 4 and rotary kiln 12 is connected, to guarantee the sealing effectiveness of 12 in transfer slide 4 and rotary kiln.In the center goes out feed bin 7, preheating chamber 3 and transfer slide 4, lay refractory material 11 thermal insulation layers respectively,, make preheater 10 housings avoid the erosion of high-temperature flue gas by the heat-blocking action of refractory material 11.When improving 10 service lifes of preheater, reduce the radiation loss of preheater 10, improve the thermal efficiency of preheater 10.

Claims (6)

1. energy efficiency type two temperature field rotary kiln, comprise rotary kiln, be arranged on rotary kiln end multicenter combustor and cooler, be arranged on the preheater of rotary kiln, it is characterized in that: the built-in combustion device is set in described preheater, be provided with the second temperature field fuel conduit and the second temperature field combustion air pipeline at described rotary kiln afterbody, the described second temperature field fuel conduit, one end links to each other with described built-in combustion device, and the other end links to each other with the described second temperature field fuel system; Described second temperature field combustion air pipeline one end links to each other with described built-in combustion device, and the other end links to each other with cooler that is arranged on rotary kiln end or auxiliary combustion air air feed system.
2. energy efficiency type two temperature according to claim 1 field rotary kiln, it is characterized in that: the described multicenter combustor that is connected with the first temperature field fuel system with wind air feed system, as first temperature field of supplying with the material after baking, described preheater adopts the tubulation preheater that has the built-in combustion device, described built-in combustion device is connected with the second temperature field fuel conduit with the described second temperature field combustion air pipeline, as second temperature field of supplying with material bakes to burn the article in described tubulation preheater.
3. energy efficiency type two temperature according to claim 2 field rotary kiln, it is characterized in that: the described top that has the tubulation preheater of built-in combustion device is a feed bin, circle distribution along described feed bin bottom has independent feed pipe, the below of the preheating chamber that has the independent exhaustion pipe that is communicated with described feed pipe is provided with the center and goes out feed bin, go out feed bin at described center and over against described preheating chamber discharging opening place material-pulling device is set, the bottom that described center goes out feed bin is communicated with described rotary kiln by transfer slide and sealing device.
4. according to the described energy efficiency type of claim 1 two temperature field rotary kiln, it is characterized in that: described built-in combustion device is arranged on the outer wall of described preheating chamber.
5. energy efficiency type two temperature according to claim 1 field rotary kiln, it is characterized in that: described built-in combustion device is arranged on the sidewall of described transfer slide.
6. energy efficiency type two temperature according to claim 1 field rotary kiln, it is characterized in that: described built-in combustion device is arranged on the center that described center goes out the top of feed bin.
CN2010206478137U 2010-12-08 2010-12-08 Energy-saving efficiency-improving rotary kiln with double temperature fields Expired - Fee Related CN201885553U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984319A (en) * 2010-12-08 2011-03-09 鞍山市华杰建材技术开发有限公司 Energy-saving and efficiency-improvement double-temperature-field rotary kiln system
CN104110958A (en) * 2013-04-19 2014-10-22 天瑞集团水泥有限公司 Method and device for supplying primary air for kiln head of cement kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984319A (en) * 2010-12-08 2011-03-09 鞍山市华杰建材技术开发有限公司 Energy-saving and efficiency-improvement double-temperature-field rotary kiln system
CN104110958A (en) * 2013-04-19 2014-10-22 天瑞集团水泥有限公司 Method and device for supplying primary air for kiln head of cement kiln

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Granted publication date: 20110629

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