CN204714535U - A kind of high-temperature calcination Alpha-alumina cyclone preheating device - Google Patents
A kind of high-temperature calcination Alpha-alumina cyclone preheating device Download PDFInfo
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Abstract
The utility model relates to the technical field of the supplementary unit of high-temperature calcination Alpha-alumina, be specially a kind of high-temperature calcination Alpha-alumina cyclone preheating device, comprise at least two stage cyclone preheater, described cyclone preheater comprises cylindrical tube and is positioned at the cone of bottom, is provided with side air admission cylinder and middle air-out vertical tube in the upper end of cylindrical tube; The side air admission cylinder of upper level cyclone preheater is connected by airduct with the middle air-out vertical tube of next stage cyclone preheater, airduct is provided with opening for feed, the lower cone body of upper level cyclone preheater connects the opening for feed on the airduct of next stage cyclone preheater, the opening for feed inside of junction airduct establishes the lower cone body of the most final stage cyclone preheater of spreading plate to enter kiln chute for being connected in rotary kiln smoke-box, the side air admission cylinder of most final stage cyclone preheater connects rotary kiln smoke-box flue gas expelling tube by airduct, realizes energy-saving and emission-reduction.
Description
Technical field
The utility model relates to the technical field of the supplementary unit of high-temperature calcination Alpha-alumina, be specially a kind of high-temperature calcination Alpha-alumina cyclone preheating device, for when carrying out high-temperature calcination Alpha-alumina with aluminium hydroxide and commercial alumina as raw material, carry out heat exchange preheating colleague to raw material greatly to reduce exhaust temperature and maximize heat energy when reclaiming product cooling, realize energy-saving and emission-reduction.
Background technology
High-temperature calcination Alpha-alumina is as a kind of type material and environment-friendly materials, purposes is more and more extensive, it is worth an also road hurricane, be subject to people from all walks of life's favorable comment and selection, its main application is ceramic industry, refractory materials and Abrasive Industry, can hard mass be processed in addition, the fields such as aviation, guided missile, military affairs can also be used for.No matter for which kind of industry, when its final transformation of crystal is Alpha-alumina, all high-temperature calcination must be carried out.Current China high-temperature calcination Alpha-alumina production method mainly contains:
1) down-draft kiln: this kiln type belongs to periodic kiln.Raw material is loaded saggar, and enter kiln and once calcine and form, be subject to kiln type structural limitations, temperature is generally no more than 1400 DEG C, and because kiln space is large, temperature controls there is larger difficulty, and upper and lower, inside and outside have comparatively big error, and therefore quality is uneven.
2), tunnel furnace: this kiln type belongs to continuity kiln.Raw material is loaded saggar, enters through fully calcined from kiln hood, from kiln tail removal, the clinkering zone designing technique of this kiln is comparatively ripe, and section temperature is little, and temperature control effect is good, and calcining temperature can reach 1600 DEG C, and thus temperature is easy to control.Shortcoming: energy consumption is high, efficiency is low, not easily maximizes.
3) hollow rotary kiln: this kiln type belongs to continuity kiln.Raw material has kiln tail to enter, from kiln hood removal after calcining, enter cooler cooling, it is combustion-supporting that the secondary hot-air of cooler enters rotary kiln, and this kiln temperature degree is easy to control, and burning zone temperature regulates as required, substantially the production requirement of different calcining system can be met, this kiln type production capacity is large, and production cost is low, is applicable to the product that production lot is larger.Shortcoming is that energy consumption is high, and its exhaust temperature more than 400 DEG C, used heat cannot utilize.
And, calcined product is through rotary kiln end cooling zone temperature about 900 DEG C, need to be cooled to less than 80 DEG C to pack, China's Traditional Method adopts single cylinder cooling machine, owing to avoiding reentrainment of dust in cooler (material airborne dust affects quality product along with secondary air enters rotary kiln burning), material delivering plate is not established in cooler, the outer spraying cooling water of cylindrical shell is adopted to lower the temperature, about the 60% heat energy water-band that is cooled is walked, cause energy consumption to increase, therefore exploitation power-saving technology realizes energy-saving and emission-reduction has far reaching significance to the nonmetal novel material industry development of China.
Traditional processing technology process description (see accompanying drawing 1): what China's high temperature Alpha-alumina production was more advanced is exactly that hollow rotary kiln calcination method (compares down-draft kiln, tunnel kiln is advanced), its technical process is, raw aluminum hydroxide driving is sent into lift and is carried in weighing hopper, rotary kiln is entered through metering screw, rotary kiln employing Sweet natural gas or coal gas do fuel and burn at kiln hood, temperature controls about 1400 DEG C, material is under rotary kiln rotates, flow from kiln Caudad kiln hood high-temperature zone, complete in proper order when temperature is raised to 110-120 DEG C and slough mechanical water, slough two crystal water when temperature is raised to 200-250 DEG C and become boehmite, the 3rd crystal water anhydrous r-aluminum oxide is sloughed when temperature of charge is raised to about 550 DEG C, temperature of charge reaches more than 850 DEG C and starts by anhydrous r-alumina conversion Alpha-alumina, temperature reaches more than 1300 DEG C transformation efficiencys and reaches more than 95%, enter monotubular to cool without material delivering plate cooler, cooler adopts the outer cooling water circulation cooling down of cylindrical shell, the product being cooled to 80 DEG C is packed through transfer roller feeding packaging storehouse, inspection is dispatched from the factory.The heat smoke of about about 400 DEG C of kiln discharge, through two stage cyclone fly-ash separator dedusting cooling, enters bagroom and purifies further and gather dust, then emptying through induced draft fan.
For the processing mode of kiln discharge heat smoke, do not utilize fully, cause the waste of resource; The rotary kiln of temperature when on the other hand entering to(for) raw material is lower, does not have preheating.
Utility model content
The purpose of this utility model is exactly the wasting of resources for above-mentioned kiln discharge heat smoke and raw material preheating problem, a kind of high-temperature calcination Alpha-alumina cyclone preheating device is provided, this device is by texture improvement and connect setting, achieve and rotary kiln inner exhaust gas is carried out effective heat exchange, raw material is heated, both saved the energy, reduce vent gas treatment difficulty, turn improve material temperature, ensure that the stability of quality, i.e. not airborne dust but also reclaim the energy-conservation object of heat.
The technical solution of the utility model is:
A kind of high-temperature calcination Alpha-alumina cyclone preheating device, it is characterized in that, comprise at least two stage cyclone preheater, described cyclone preheater comprises cylindrical tube and is positioned at the cone of bottom, be provided with side air admission cylinder and middle air-out vertical tube in the upper end of cylindrical tube, be provided with blanking lock wind flap valve in the bottom of cone; The side air admission cylinder of upper level cyclone preheater is connected by airduct with the middle air-out vertical tube of next stage cyclone preheater, airduct is provided with opening for feed, the lower cone body of upper level cyclone preheater connects the opening for feed on the airduct of next stage cyclone preheater, and spreading plate is established in the opening for feed inside of junction airduct; The middle air-out vertical tube of first step cyclone preheater is for connecting bagroom, the lower cone body of most final stage cyclone preheater enters kiln chute for being connected in rotary kiln smoke-box, and the side air admission cylinder of most final stage cyclone preheater connects rotary kiln smoke-box flue gas expelling tube by airduct.
Feature of the present utility model also has:
Described cyclone preheater adopts 2-4 level.
Described cyclone preheater adopts 3 grades, and what preheater is just made up of the cyclone preheater of several monomer, has heat exchange and gas-solid separation of double function.
The gas speed of described side air admission cylinder is 18-20m/s.
It is 3-5m/s that described middle air-out vertical tube discharges gas speed.
Monomer cyclone preheater principle of work is: the heat smoke containing powder material enters cylindrical tube through side air admission cylinder and prolongs tangential rotation, prolong cylindrical tube after speed reduction after solid phase powder material encounters cylindrical tube and be slipped to lower cone body, material is locked wind flap valve by lower cone body through blanking and is discharged, and heat smoke is discharged by middle air-out vertical tube after tangentially rotating and falling low gas velocity.
Airduct is had to connect between two cyclone preheaters, facade is arranged as: most upper level is called the first step, most next stage is called N level, the middle air-out vertical tube of second stage preheater connects the side air admission cylinder of first step preheater, the middle air-out vertical tube of first step preheater connects bagroom, opening for feed on first step cyclone preheater airduct is for connecting original feed device, as feeding packing auger, the middle air-out vertical tube of third stage preheater connects the side air admission cylinder of second stage preheater, the lower cone body of first step preheater is connected on the middle air-out vertical tube of third stage preheater and the side air admission cylinder connecting tube of second stage preheater, junction pipe interior establishes spreading plate, its objective is and taken away dispersed for solid powder by heat smoke, and material carries out quick heat exchange in by heat smoke dispersion course of conveying, reach the object of material evaporation and preheating.
Material lock wind flap valve is set in preheater blanking cone bottom, its objective is that the material controlled in cyclone preheater lower cone body has certain material level, both ensured that the material of lower cone body can not descend sky to cause heat smoke short circuit to enter from lower cone body and affect gas solid separation, ensured again that the level of filler material of lower cone body can not too highly cause cyclone preheater to block.
The side air admission cylinder of most final stage cyclone preheater connects rotary kiln smoke-box flue gas expelling tube, and the lower cone body of preheater is connected to and enters kiln chute in rotary kiln smoke-box, and the material completing preheating enters people's calcined by rotary kiln.
The beneficial effects of the utility model are: this high-temperature calcination Alpha-alumina cyclone preheating device, comprise at least two stage cyclone preheater, arranged by texture improvement and connection, achieve and rotary kiln inner exhaust gas is carried out effective heat exchange, raw material is heated, both saved the energy, reduce vent gas treatment difficulty, turn improve material temperature, ensure that the stability of quality, i.e. not airborne dust but also reclaim the energy-conservation object of heat.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is cyclone preheater structural representation;
Fig. 3 is A-A sectional view in Fig. 2;
Fig. 4 is spreading plate installation site schematic diagram;
Fig. 5 is the structural representation of spreading plate;
Wherein, 1-side air admission cylinder, air-out vertical tube in the middle of 2-, 3-cylindrical tube, 4-cone, 5-blanking lock wind flap valve, 6-airduct, 7-opening for feed, 8-bagroom, 9-rotary kiln, 10-feeding packing auger, 11-first step preheater, 12-second stage preheater, 13-third stage preheater, 11-spreading plate.
Embodiment
Below by specific embodiment, the technical solution of the utility model is described in detail.
embodiment 1 three grades of cyclone preheaters
A kind of high-temperature calcination Alpha-alumina cyclone preheating device, comprise three grades of cyclone preheaters, described cyclone preheater comprises cylindrical tube 3 and is positioned at the cone 4 of bottom, be provided with side air admission cylinder 1 and middle air-out vertical tube 2 in the upper end of cylindrical tube, be provided with blanking lock wind flap valve 5 in the bottom of cone 4; The side air admission cylinder 1 of upper level cyclone preheater is connected by airduct 6 with the middle air-out vertical tube 2 of next stage cyclone preheater, airduct 6 is provided with opening for feed 7, the lower cone body 4 of upper level cyclone preheater connects the opening for feed 7 on the airduct of next stage cyclone preheater, and spreading plate is established in the opening for feed inside of junction airduct; The middle air-out vertical tube 2 of first step cyclone preheater is for connecting bagroom 8, the lower cone body of most final stage cyclone preheater enters kiln chute for being connected in rotary kiln 9 kiln tail smoke-box, and the side air admission cylinder of most final stage cyclone preheater connects rotary kiln smoke-box flue gas expelling tube by airduct.
Be arranged as at facade: most upper level is called the first step, most next stage is called 3rd level, the middle air-out vertical tube 2 of second stage preheater 12 connects the side air admission cylinder 1 of first step preheater, the middle air-out vertical tube 2 of first step preheater connects bagroom 8, opening for feed 7 on first step cyclone preheater 11 airduct 6 is for connecting original feed device, as feeding packing auger 10, the middle air-out vertical tube 2 of third stage preheater 13 connects the side air admission cylinder 1 of second stage preheater, the middle air-out vertical tube 2 that the lower cone body 4 of first step preheater is connected to third stage preheater is connected opening for feed 7 place on airduct 6 with the side air admission cylinder 1 of second stage preheater, spreading plate is established in pipeline opening for feed 7 inside, junction, its objective is and taken away dispersed for solid powder by heat smoke, and material carries out quick heat exchange in by heat smoke dispersion course of conveying, reach the object of material evaporation and preheating.
Material lock wind flap valve is set in preheater blanking cone bottom, its objective is that the material controlled in cyclone preheater lower cone body has certain material level, both ensured that the material of lower cone body can not descend sky to cause heat smoke short circuit to enter from lower cone body and affect gas solid separation, ensured again that the level of filler material of lower cone body can not too highly cause cyclone preheater to block.
The side air admission cylinder 1 of third stage cyclone preheater connects rotary kiln 9 kiln tail smoke-box flue gas expelling tube, and the lower cone body 4 of third stage cyclone preheater is connected to and enters kiln chute in rotary kiln 9 kiln tail smoke-box, and the material completing preheating enters people's calcined by rotary kiln.
The gas speed of described side air admission cylinder is 18-20m/s.
It is 3-5m/s that described middle air-out vertical tube discharges gas speed.
Monomer cyclone preheater principle of work is: the heat smoke containing powder material enters cylindrical tube through side air admission cylinder and prolongs tangential rotation, prolong cylindrical tube after speed reduction after solid phase powder material encounters cylindrical tube and be slipped to lower cone body, material is locked wind flap valve by lower cone body through blanking and is discharged, and heat smoke is discharged by middle air-out vertical tube after tangentially rotating and falling low gas velocity.
Adopt high-temperature calcination Alpha-alumina cyclone preheating device of the present utility model, carry out in raw material and rotary kiln exhaust gas heat exchange step, raw aluminum hydroxide and commercial alumina enter first step cyclone preheater group material feeding mouth, tail gas from rotary kiln enters third stage cyclone preheater side air admission cylinder, and material and tail gas carry out counter-current gas-solid heat exchange in cyclone preheater group; Material is after the heat exchange of cyclone preheater device, and temperature reaches 550-650 DEG C and enters rotary kiln, after rotary kiln exhaust gas heat exchange temperature be down to 220-160 DEG C enter bagroom purification after through induced draft fan qualified discharge.
Raw material and tail gas heat exchange concrete steps are: enter first step cyclone preheater opening for feed after raw aluminum hydroxide and commercial alumina measure, enter third stage preheater side air admission cylinder from the tail gas of rotary kiln 650-750 DEG C, in three grades of cyclone preheaters, carry out counter-current gas-solid heat exchange respectively with the material from first step preheater; First step cyclone preheater side air admission cylinder input gas temperature 380-420 DEG C, middle air-out vertical tube exit gas temperature 200-240 DEG C, second stage cyclone preheater side air admission cylinder input gas temperature 530-570 DEG C, middle air-out vertical tube exit gas temperature 380-420 DEG C, third stage cyclone preheater side air admission cylinder input gas temperature 680-720 DEG C, middle air-out vertical tube exit gas temperature is about 530-570 DEG C; Material is after the heat exchange of cyclone preheater device, and temperature reaches 550-650 DEG C and enters rotary kiln, after rotary kiln exhaust gas heat exchange temperature be down to 220-160 DEG C enter bagroom purification after through induced draft fan qualified discharge.
Material sloughs mechanical water when temperature is raised to 110-120 DEG C in first step cyclone preheater, sloughs two crystal water and become boehmite when temperature is raised to 200-250 DEG C; Material enters second stage cyclone preheater to be continued to purify two crystal water; Material enters to be sloughed the 3rd crystal water when third stage cyclone preheater temperature is raised to 550 DEG C and becomes anhydrous r-aluminum oxide.
example 1 produces the three grades of cyclone preheater application of 150,000 tons of Alpha-alumina devices per year
1) main equipment specification
Three grades of cyclone preheaters:
First step cyclone preheater diameter 3960*4000mm, central tube diameter 1650mm;
Second stage cyclone preheater diameter 3960*4000mm, central tube diameter 1650mm;
Third stage cyclone preheater diameter 3960*4000mm, central tube diameter 1650mm.
2) operation index
Consume aluminium hydroxide 31.9t/h, output 18.75t/h.
First step cyclone preheater side air admission cylinder input gas temperature about 400 DEG C, middle air-out vertical tube exit gas temperature about 220 DEG C;
Second stage cyclone preheater side air admission cylinder input gas temperature about 550 DEG C, middle air-out vertical tube exit gas temperature about 400 DEG C;
Third stage cyclone preheater side air admission cylinder input gas temperature about 700 DEG C, middle air-out vertical tube exit gas temperature about 550 DEG C.
Rotary kiln end temperature 900 DEG C of burning zone temperature 1350-1450 DEG C kiln end temperatures 700 DEG C.
Main absorbing quantity: 43150-45000Nm3/h, enters rotary kiln material temperature about 600 DEG C, goes out rotary kiln (entering cooler) temperature of charge about 890 DEG C, goes out cooler temperature of charge 80 DEG C, Alpha-alumina transformation efficiency >95%.
3) energy-saving effect
Rotary kiln amount of energy saving: (400 DEG C-220 DEG C) × 1.3kj/kg. DEG C × 1.1kg/ Nm
3× 1726Nm
3/ t=444401.1 kj/t.
Cooler energy-saving effect:
1.23kj/kg.℃×1000kg×（890℃-100℃）=971700 kj/t，
971700 kj/t×60%=583020 kj/t。
The energy-conservation 444401.1+583020=1027421.1kj/ t of amounting to of product per ton rolls over Sweet natural gas and reduces consumption 28.6 m3/t.
Spring Festival holidays gas consumption 4290000 m3/t, considerable benefit.
Claims (6)
1. a high-temperature calcination Alpha-alumina cyclone preheating device, it is characterized in that, comprise at least two stage cyclone preheater, described cyclone preheater comprises cylindrical tube and is positioned at the cone of bottom, be provided with side air admission cylinder and middle air-out vertical tube in the upper end of cylindrical tube, be provided with blanking lock wind flap valve in the bottom of cone; The side air admission cylinder of upper level cyclone preheater is connected by airduct with the middle air-out vertical tube of next stage cyclone preheater, airduct is provided with opening for feed, the lower cone body of upper level cyclone preheater connects the opening for feed on the airduct of next stage cyclone preheater, and spreading plate is established in the opening for feed inside of junction airduct; The middle air-out vertical tube of first step cyclone preheater is for connecting bagroom, the lower cone body of most final stage cyclone preheater enters kiln chute for being connected in rotary kiln smoke-box, and the side air admission cylinder of most final stage cyclone preheater connects rotary kiln smoke-box flue gas expelling tube by airduct.
2. high-temperature calcination Alpha-alumina cyclone preheating device according to claim 1, is characterized in that, described cyclone preheater adopts 2-4 level.
3. high-temperature calcination Alpha-alumina cyclone preheating device according to claim 2, it is characterized in that, described cyclone preheater adopts 3 grades.
4. high-temperature calcination Alpha-alumina cyclone preheating device according to claim 1, is characterized in that, the gas speed of described side air admission cylinder is 18-20m/s.
5. high-temperature calcination Alpha-alumina cyclone preheating device according to claim 4, is characterized in that, the gas speed of described side air admission cylinder is 20m/s.
6. high-temperature calcination Alpha-alumina cyclone preheating device according to claim 1, is characterized in that, it is 3-5m/s that described middle air-out vertical tube discharges gas speed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107151570A (en) * | 2017-07-03 | 2017-09-12 | 山西新唐工程设计股份有限公司 | Pulverized coal pyrolysis gas high-temperature dust removal device and its dust removal method |
| CN112174175A (en) * | 2020-09-22 | 2021-01-05 | 河南华慧有色工程设计有限公司 | Energy-concerving and environment-protective type aluminium hydroxide suspension calcination equipment |
| CN112174176A (en) * | 2020-09-28 | 2021-01-05 | 沈阳鑫博工业技术股份有限公司 | Device and method for preparing alpha-alumina by using aluminum hydroxide |
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2015
- 2015-05-21 CN CN201520331546.5U patent/CN204714535U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107151570A (en) * | 2017-07-03 | 2017-09-12 | 山西新唐工程设计股份有限公司 | Pulverized coal pyrolysis gas high-temperature dust removal device and its dust removal method |
| CN112174175A (en) * | 2020-09-22 | 2021-01-05 | 河南华慧有色工程设计有限公司 | Energy-concerving and environment-protective type aluminium hydroxide suspension calcination equipment |
| CN112174176A (en) * | 2020-09-28 | 2021-01-05 | 沈阳鑫博工业技术股份有限公司 | Device and method for preparing alpha-alumina by using aluminum hydroxide |
| CN112174176B (en) * | 2020-09-28 | 2022-11-15 | 沈阳鑫博工业技术股份有限公司 | Device and method for preparing alpha-alumina by using aluminum hydroxide |
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