CN211204876U - Calcination rotary kiln for producing special alumina - Google Patents
Calcination rotary kiln for producing special alumina Download PDFInfo
- Publication number
- CN211204876U CN211204876U CN201922164799.9U CN201922164799U CN211204876U CN 211204876 U CN211204876 U CN 211204876U CN 201922164799 U CN201922164799 U CN 201922164799U CN 211204876 U CN211204876 U CN 211204876U
- Authority
- CN
- China
- Prior art keywords
- kiln
- kiln body
- rotary
- rotary kiln
- shield
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000001354 calcination Methods 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 57
- 230000002829 reductive effect Effects 0.000 abstract description 11
- 239000002817 coal dust Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 2
- 244000309464 bull Species 0.000 abstract 2
- 238000000034 method Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000000338 in vitro Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model provides a special type alumina production is with calcining rotary kiln, relates to the rotary furnace field, including the rotary kiln that the slope was placed, the rotary kiln is kiln head, the kiln body and kiln tail by low side to the high-end in proper order, kiln head intercommunication has coal injection pipe, kiln body below is provided with the riding wheel, and the fixed bull gear that is equipped with on the kiln body, the bull gear meshing has drive mechanism, its characterized in that, kiln body overcoat is equipped with hollow guard shield, and the guard shield rotates with the kiln body to be connected, the guard shield is equipped with fixed mount outward, and the fixed miniature combustor that is equipped with on the mount, the spray tube of combustor stretches into in the guard shield, coal injection pipe spouts to kiln body middle part, the guard shield is located kiln body and is close to kiln tail department. The amount of the coal dust of the coal injection pipe is dispersed, the condition of insufficient combustion is made on the premise of ensuring the calcination quality, the nitrogen oxide is reduced, and the generation of the nitrogen oxide is reduced from the source; the upstream burner is arranged to prolong the firing section area, so that the alumina is more fully calcined.
Description
Technical Field
The utility model relates to the field of rotary furnaces, in particular to an enthusiasm aluminum oxide production calcining rotary kiln.
Background
The special alumina is non-metallurgical alumina, a large amount of nitrogen oxides can be generated in the calcination stage of the special alumina, the nitrogen oxides are main pollutants discharged in the calcination process of the alumina, and the SCR denitration process is mainly adopted for controlling the discharge of the nitrogen oxides in the prior art.
The SCR denitration process has two problems in the using process, firstly, the application temperature of the technology is required to be 300-420 ℃ generally, the temperature of flue gas discharged by a calcining rotary kiln is 260-290 ℃ generally, and a good catalytic effect cannot be achieved; second, the cost of the SCR denitration process is very expensive.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a calcination rotary kiln for special oxidation production, which reduces nitrogen oxides by reducing the reductive components generated by the burning rate of pulverized coal.
The calcining rotary kiln for producing the special alumina comprises a rotary kiln which is obliquely placed, wherein a kiln head, a kiln body and a kiln tail are sequentially arranged on the rotary kiln from a low end to a high end, the kiln head is communicated with a coal injection pipe, supporting wheels are arranged below the kiln body, a large gear ring is fixedly arranged on the kiln body, and a transmission mechanism is meshed with the large gear ring.
Preferably, the fixing frame is of a mouth shape, the rotary kiln position is transmitted into the fixing frame, a circular bracket is fixedly arranged on the fixing frame, the shield is fixed in the bracket, a fixing plate extends inwards from the fixing frame, and the burner is fixed on the fixing plate.
Preferably, the shield and the kiln body are connected by a high-temperature-resistant bearing.
Preferably, the inner surface of the shield is paved with refractory bricks.
Preferably, the number of the burners is three, the burners are uniformly distributed on the periphery of the kiln body, and the injection direction of each burner is tangential to the kiln body.
Preferably, the kiln tail is connected with a first cyclone collector, a second cyclone collector and a metal filter bag in sequence.
The utility model has the advantages that: the amount of the coal dust of the coal injection pipe is dispersed, the condition of insufficient combustion is made on the premise of ensuring the calcination quality, the nitrogen oxide is reduced, and the generation of the nitrogen oxide is reduced from the source; the upstream burner is arranged to prolong the firing section area, so that the alumina is more fully calcined.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a burner installation;
fig. 3 is a schematic view of the internal structure of the shield.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
The calcining rotary kiln for producing the special alumina comprises a rotary kiln which is obliquely arranged, wherein a kiln head 1, a kiln body 2 and a kiln tail 3 are sequentially arranged on the rotary kiln from the low end to the high end, the kiln head 1 is communicated with a coal injection pipe, a supporting wheel 4 is arranged below the kiln body 2, a large gear ring 5 is fixedly arranged on the kiln body 2, the large gear ring 5 is meshed with a transmission mechanism, the supporting wheel 4 is arranged on a base, the kiln body 2 is obliquely arranged on the supporting wheel 4, a motor drives the large gear ring 5 to rotate through a belt mechanism, and further drives the whole kiln body 2 to rotate, the calcining rotary kiln is characterized in that a hollow shield 6 is sleeved outside the kiln body 2, the shield 6 is rotatably connected with the kiln body 2, a fixed fixing frame 7 is arranged outside the shield 6, a small-sized combustor 8 is fixedly arranged on the fixing frame 7, a spray pipe of the combustor 8 extends into the shield 6, and the coal injection pipe is sprayed to the middle part of the kiln body, the shield 6 is positioned on the kiln body 2 near the kiln tail 3. The nitrogen oxides mainly come from high-temperature reaction of nitrogen and oxygen in the air, a kiln head 1 to a kiln tail 3 in the rotary kiln are sequentially divided into a cooling zone A, a burning zone B and a preheating zone C according to different temperatures, the higher the temperature is, the higher the generation rate of the nitrogen oxides is, and the overhigh temperature of the burning zone B can generate a large amount of nitrogen oxides; originally, the total coal quantity heated in the rotary kiln with only the coal injection pipe is M, after the combustor 8 is added, the total coal quantity of the coal injection pipe is set to be M1, M1 is 70% M, the coal injection quantity of the combustor 8 is set to be M2, and M2 is 40% M, so that the temperature output by the coal injection pipe is reduced, the shield 6 is positioned on the kiln body 2 near the kiln tail 3, the area of the burning zone B is prolonged, the area of the preheating zone C is shortened, the burner 8 is injected in the shield 6 to heat the kiln body 2 in vitro, in consideration of heat loss caused by heating outside the kiln, in order to ensure that the temperature in the burning zone B maintains the normal calcining temperature, therefore, the coal injection amount M2 of the burner 8 is set to 40% M, the total coal amount after the burner 8 is added is M1+ M2=110% M, and the extra 10% M is the preset loss amount of heating outside the kiln, so as to ensure that the temperature of the burning zone B can maintain normal calcination.
In conclusion, the burner 8 is opposite to the pulverized coal sprayed into the shield 6, the position of the shield 6 enables the heating area of the burner 8 to be connected with the area related to the coal spraying pipe, the original burning zone B is prolonged towards the direction of the kiln tail 3, the alumina entering the burning zone B in advance is calcined, the alumina is burnt and calcined more thoroughly due to proper prolonging of the burning zone B, the quality is better, meanwhile, the nitrogen oxide can be generated in the burning zone B, the coal spraying amount of the coal spraying pipe is reduced, the air in the kiln is excessive relatively, therefore, the pulverized coal is insufficiently burnt to generate carbon monoxide and hydrocarbon substances, the carbon monoxide and the hydrocarbon substances have reducibility, the nitrogen oxide can be reduced, and the emission of the nitrogen oxide is reduced from the source.
The fixing frame 7 is of a mouth shape, the rotary kiln position is transmitted into the fixing frame 7, a round bracket 71 is fixedly arranged on the fixing frame 7, the shield 6 is fixed in the bracket 71, a fixing plate 72 extends inwards and is fixed on the fixing frame 7, and the combustor 8 is fixed on the fixing plate 72. The fixed mount 7 and the riding wheel 4 are placed on the foundation or directly fixed on the bottom surface, so that the stability of the fixed mount 7 is ensured, and the shield 6 is fixed by the bracket 71.
The shield 6 is connected with the kiln body 2 by a high temperature resistant bearing. The protective cover 6 is rotatably connected with the kiln body 2 through a bearing, the kiln body 2 is obliquely arranged, the bearing bears axial force and radial force, and a self-aligning ball bearing is preferably selected as a high-temperature-resistant bearing.
The inner surface of the shield 6 is paved with refractory bricks. Because the burner 8 in the shield 6 heats the kiln body 2 in vitro, the temperature of the surface of the shield 6 is very high, and the temperature generated by the burner 8 can be diffused too fast by the shield 6 alone, so the firebrick is arranged to increase the heat preservation effect of the shield 6.
The three burners 8 are uniformly distributed on the periphery of the kiln body 2, and the injection direction of each burner 8 is tangent to the kiln body 2. The heat of the burners 8 forms a circulating flow along the tangential direction of the kiln body 2, so that the temperature in the shield 6 is rapidly raised, and the three burners 8 are uniformly distributed to uniformly distribute the heat.
The kiln tail 3 is sequentially connected with a first cyclone collector, a second cyclone collector and a metal filter bag. The smoke discharged from the kiln tail 3 contains alumina particles, and the alumina particles need to be collected by the first cyclone collector and the second cyclone collector, so that the loss of raw materials and air pollution are prevented; the temperature of the flue gas discharged from the kiln tail 3 reaches 260-290 ℃, the common bag-type dust collector cannot work for a long time at the temperature, and the bag-type dust collector and the high-temperature bag are easy to burn, so that a metal filter bag is adopted to improve the flue gas filtering effect.
The utility model discloses when using, the aluminium oxide raw materials gets into the rotary kiln from kiln tail 3, preheat by the temperature that comes down to rush in the preheating zone C of kiln tail 3, the rotary kiln constantly rotates, the aluminium oxide raw materials drops and removes to kiln head 1 direction at the rotation in-process, because burning zone B is prolonged, just begin to be calcined after the aluminium oxide gets into the region that guard shield 6 covered, the air in the kiln body 2 can produce a large amount of nitrogen oxides under the high temperature simultaneously, but the burning temperature of aluminium oxide can only be guaranteed to the coal-injection pipe injection region's in low reaches temperature, because the pulverized coal burning does not fully produce reducing substance, reducing substance is with the nitrogen oxide reduction in upper reaches, and then realize reducing the purpose that nitrogen oxide discharged.
The utility model has the advantages that: the amount of the coal dust of the coal injection pipe is dispersed, the condition of insufficient combustion is made on the premise of ensuring the calcination quality, the nitrogen oxide is reduced, and the generation of the nitrogen oxide is reduced from the source; the upstream burner is arranged to prolong the firing section area, so that the alumina is more fully calcined.
The above-mentioned embodiments are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design concept of the present invention should be included in the protection scope defined by the claims of the present invention.
Claims (6)
1. The calcining rotary kiln for producing the special alumina comprises a rotary kiln which is obliquely arranged, wherein a kiln head 1, a kiln body 2 and a kiln tail 3 are sequentially arranged on the rotary kiln from a low end to a high end, the kiln head 1 is communicated with a coal spraying pipe, supporting wheels 4 are arranged below the kiln body 2, a large gear ring 5 is fixedly arranged on the kiln body 2, and the large gear ring 5 is meshed with a transmission mechanism.
2. The rotary calcining kiln for producing the special alumina as claimed in claim 1, wherein the fixing frame 7 is of a mouth shape, the rotary kiln position is transmitted into the fixing frame 7, a circular bracket 71 is fixedly arranged on the fixing frame 7, the shield 6 is fixed in the bracket 71, a fixing plate 72 is fixed on the fixing frame 7 in a protruding manner, and the burner 8 is fixed on the fixing plate 72.
3. The calcination rotary kiln for producing the special alumina as claimed in claim 2, wherein the shield 6 is connected with the kiln body 2 by a high temperature bearing.
4. The rotary calcining kiln for producing special alumina as claimed in claim 3, characterized in that the inner surface of the shield 6 is laid with refractory bricks.
5. The calcination rotary kiln for producing the special alumina as claimed in claim 1 or 2, wherein the number of the burners 8 is three, the burners are uniformly distributed on the periphery of the kiln body 2, and the injection direction of each burner 8 is tangential to the kiln body 2.
6. The calcination rotary kiln for producing the special alumina as claimed in claim 1, wherein the kiln tail 3 is connected with a first cyclone collector, a second cyclone collector and a metal filter bag in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922164799.9U CN211204876U (en) | 2019-12-06 | 2019-12-06 | Calcination rotary kiln for producing special alumina |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922164799.9U CN211204876U (en) | 2019-12-06 | 2019-12-06 | Calcination rotary kiln for producing special alumina |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211204876U true CN211204876U (en) | 2020-08-07 |
Family
ID=71884092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922164799.9U Active CN211204876U (en) | 2019-12-06 | 2019-12-06 | Calcination rotary kiln for producing special alumina |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211204876U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112023834A (en) * | 2020-11-03 | 2020-12-04 | 小跃科技(北京)有限公司 | High-temperature carbon dioxide collecting furnace |
| CN113865335A (en) * | 2021-10-26 | 2021-12-31 | 万和花 | Cement rotary kiln |
-
2019
- 2019-12-06 CN CN201922164799.9U patent/CN211204876U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112023834A (en) * | 2020-11-03 | 2020-12-04 | 小跃科技(北京)有限公司 | High-temperature carbon dioxide collecting furnace |
| CN113865335A (en) * | 2021-10-26 | 2021-12-31 | 万和花 | Cement rotary kiln |
| CN113865335B (en) * | 2021-10-26 | 2024-05-10 | 南雄市彤置富水泥建材投资有限公司 | Cement rotary kiln |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106892578B (en) | A kind of full recycling CO2Lime kiln device | |
| CN211204876U (en) | Calcination rotary kiln for producing special alumina | |
| CN111450681B (en) | Denitration, desulfurization and dust removal integrated system for supercritical carbon dioxide coal-fired boiler | |
| CN204648216U (en) | A kind of Problem of Biomass Fuel Gas Combustion installment with UTILIZATION OF VESIDUAL HEAT IN | |
| CN208860109U (en) | A kind of manufacture of cement rotary kiln | |
| KR100897659B1 (en) | Method and plant for manufacturing cement clinker | |
| CN206683420U (en) | A kind of hypoxemia flameless combustion nitrogen rejection facility for cement kiln tail smoke-box | |
| WO2018058929A1 (en) | Gas water heater | |
| CN202361375U (en) | Combustor for combustion in multihole cone with quick swirling flow mixing device | |
| CN206113624U (en) | Be applied to overall process low -nitrogen combustion device that cement kiln reduces cement kiln NOx emission | |
| CN211373194U (en) | Novel rotary kiln system and oxy-fuel combustion pellet production system | |
| CN104496207B (en) | Heat storage type lime rotary kiln | |
| CN104727976B (en) | A kind of combustion heating system of Stirling engine | |
| JPS5839790B2 (en) | Cement clinker firing equipment | |
| CN213179369U (en) | Double-cylinder rotary kiln for burning back tail gas | |
| CN206361927U (en) | A kind of many spray orifice type hot-blast stoves | |
| CN113072310B (en) | Lime kiln and lime preparation method | |
| CN201184742Y (en) | Pre-heating device for secondary air and tertiary air of rotary kiln | |
| CN111450682B (en) | Deep denitration process for supercritical carbon dioxide coal-fired boiler | |
| CN110425872B (en) | Pulse type combustion rotary hearth furnace | |
| CN210229579U (en) | System for utilize dry process production technology to realize green denitration | |
| CN201232055Y (en) | Pressurized entrained-bed gasifying device for high ash fusion temperature coal | |
| CN106766153A (en) | A kind of many spray orifice type hot-blast stoves | |
| CN207975657U (en) | A kind of rotary kiln | |
| CN201621692U (en) | Special chromium residue dry-detoxification pulverized coal burner and rotary kiln assorted with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A calcination rotary kiln for the production of special alumina Granted publication date: 20200807 Pledgee: China Construction Bank Corporation Zhengzhou Jinshui sub branch Pledgor: HENAN TIANMA NEW MATERIAL CO.,LTD. Registration number: Y2024980012368 |