CN202048779U - Reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues - Google Patents
Reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues Download PDFInfo
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- CN202048779U CN202048779U CN2011201057530U CN201120105753U CN202048779U CN 202048779 U CN202048779 U CN 202048779U CN 2011201057530 U CN2011201057530 U CN 2011201057530U CN 201120105753 U CN201120105753 U CN 201120105753U CN 202048779 U CN202048779 U CN 202048779U
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- rotary kiln
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Abstract
The utility model provides a reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues, comprising two supporting wheels with rolling bearings and a rotary kiln cylinder that is erected on the supporting wheels and can rotate, wherein the material outlet end of the rotary kiln cylinder is provided with a heat storage dam; the heat storage dam is a retaining wall that is formed by inwards extending the wall surface of the rotary kiln cylinder and is built by steel framework materials wrapped by fireproof materials, with the height of 200 to 300mm and the thickness of 100 to 150mm; the heat storage dam can always store certain quantities of high-temperature clinkers and can radiate the heat to the combustion area of a burner so that the ignition speed of the fuel is improved, the problem that the temperature of the secondary air for reduction, calcination and combustion supporting is lower can be solved and the combustion of the coal dusts can be accelerated; by adopting two supporting wheels with the ball bearings, the friction resistance is reduced, the transmission efficiency is improved, the assembling precision of the supporting wheels is higher, and the running and maintaining of the kiln are more benefited.
Description
Technical field:
The utility model belongs to building materials and environmental protection and toxic waste and administers the field, is specifically related to the reduction calcination rotary kiln in chromic slag dry method detoxication, the special cement production technology.
Background technology:
Because the carcinogenesis of chromic strong oxidizing property and calcium chromate, the chromium slag is classified as hazardous waste by national departments concerned.The dry detoxified technology of chromium slag rotary kiln is the maturation process of a kind of chromium residue detoxifying that is widely adopted and chromium slag recycling.But the quality instability of chromic slag dry method detoxication system, output is on the low side, and the problem that thermal power consumption is high is the recycling treatment of difficult problem puzzlement chromic salts enterprise carries out effective, harmlessization, to(for) the chromium slag all the time.
Chromium slag rotary kiln is dry detoxified, is to utilize rotary kiln and supporting with it cooling device, through reduction calcining and cooling, changes Cr VI poisonous in the chromium slag into nontoxic trivalent chromium.Original chromium slag rotary kiln is dry detoxified all to be equipment and the flow processs that adopt original chromium salt production line, the high temperature reduction chromium slag that has detoxified is directly put into a single cylinder cooling machine cylindrical shell through water spray cooling or detoxification chromium slag is directly fallen into the pond cool off, and the result causes a large amount of evaporations of cooling water to enter rotary kiln by vomit pipe again.Water vapour causes the rising significantly of the useless exhaust gas volumn of kiln system as not going into kiln by combustion-supporting inert gas, causes the raising of system's hear rate and power consumption; Water vapour go into kiln, also postponed the ignition point of coal burner in the dry detoxified system of chromium slag rotary kiln, the interior salband of rotary kiln has extended, high temperature chromium slag prolonged with the time of contact of the combustion air that is oxidizing atmosphere substantially, the trivalent chromium that has reduced has been strengthened be oxidized to poisonous chromic trend again.The useful space that the rotary kiln reduction is calcined has also been compressed in the prolongation of salband, has reduced the output of production line significantly.
The utility model content:
In order to address the above problem, the utility model proposes a kind of combustion-supporting but chromic slag dry method detoxication reduction calcination rotary kiln that burner is effectively got angry of high temperature secondary wind that do not have.
Its concrete technical scheme is as follows:
A kind of chromic slag dry method detoxication reduction of the utility model calcination rotary kiln, comprise the cylinder of rotary kiln that support support roller and frame rotate under transmission system drives on this support support roller, the discharging port of described cylinder of rotary kiln is established the accumulation of heat dam, the barricade that this accumulation of heat dam extends internally for the cylinder of rotary kiln wall.
The height 200-300mm on described accumulation of heat dam.Described accumulation of heat dam thickness 100-150mm.
Described accumulation of heat dam is built by laying bricks or stones by refractory material parcel steel skeleton material and is formed, and wherein steel skeleton comprises integrated attachment strap and the baffle plate vertical with attachment strap, attachment strap and the parallel and overlap joint of the peripheral steel plate of cylinder of rotary kiln, and baffle plate extends internally; Build the flame retardant coating that forms the accumulation of heat dam by laying bricks or stones and the refractory masses of cylinder of rotary kiln is connected as a single entity by refractory material, it wraps baffle plate and forms described barricade.
The steel skeleton on described accumulation of heat dam also comprises bent plate, and by the baffle plate 50-100mm that stretches out vertically, the 50-100mm that radially extends internally again forms.
Described support support roller bottom is the support roller seat, and the revolute pair that supports between support roller and the support roller seat is a rolling bearing.If two are supported support roller, with the stage casing of simple beam structure balanced arrangement at cylinder of rotary kiln.
The rotating speed of described cylinder of rotary kiln is 0.4-4rpm, adopts the mode of speed governing to rotate.The draw ratio of described cylinder of rotary kiln is 13-16.
Owing to adopted technique scheme, the cylinder of rotary kiln of the utility model reduction calcination rotary kiln is rotating on two retaining rolling bearing support rollers under the driving of transmission system, the sliding bearing that differs from general rotary kiln is arranged, greatly reduce frictional resistance, improved transmission efficiency; What the assembling process of rolling bearing need not to be provided with at the scene bearing shell manually scrapes a watt processing link, and the assembly precision of support roller is higher, more helps operation maintenance; The accumulation of heat dam of discharge end is formed with the material pond of a constant volume in the cylinder of rotary kiln rotation process, material contains a certain amount of high temperature chamotte in the pond all the time, the heat that high temperature chamotte carries can be radiated the burner combustion zone, thereby improved the firing speed of fuel effectively, remedied the combustion-supporting lower problem of secondary air temperature degree of reduction calcining, quicken the burning of coal dust (or fuel), thereby make the fire coal and the AIR MIXTURES that are oxidizing atmosphere, be converted into the reduction flame under the anoxycausis condition rapidly, grog was among a kind of useful reducing atmosphere before cooling off rapidly.
The utlity model has following advantage:
1, the heat that high temperature chamotte carries in the accumulation of heat dam of discharge end can be radiated burner ignition zone, thereby has improved the firing speed of fuel effectively, has remedied the combustion-supporting lower deficiency of secondary air temperature degree of reduction calcining, quickens the burning of coal dust (or fuel);
2, the fire coal and the AIR MIXTURES that are oxidizing atmosphere are converted into the reduction flame under the anoxycausis condition rapidly, make grog be among a kind of useful reducing atmosphere before cooling off rapidly;
3, use the rotary kiln of two retaining support rollers of stable simple beam structure, supports stressed clearer and more definite, the support load variation is little, investment cost is low, Installation and Debugging are easy, fault rate is low.
4, the support roller of this kiln adopts rolling bearing, thereby greatly reduces frictional resistance, has improved transmission efficiency.The assembling process of rolling bearing need not to be provided with at the scene the hand scraping processing link of bearing shell, and the assembly precision of support roller is higher, more helps operation maintenance.
Description of drawings:
Fig. 1 is the overall structure figure of reduction calcination rotary kiln of the present utility model.
Fig. 2 is the structure chart on I part accumulation of heat dam among Fig. 1 and shows duty herein.
Fig. 3 is the structure chart of II part rolling bearing support roller among Fig. 1.
The specific embodiment:
As Fig. 1, Fig. 2 and shown in Figure 3, reduction calcination rotary kiln of the present utility model comprises cylinder of rotary kiln 1, supports support roller 2, accumulation of heat dam 3 and rolling bearing support roller 4.Wherein:
Referring to shown in Figure 1, the draw ratio of cylinder of rotary kiln 1 is 13-16, place on the support support roller 2 by the rolling ring 11 that is fixed on the cylindrical shell 1, support support roller 2 and establish two, balanced arrangement is in cylinder of rotary kiln 1 stage casing, and cylinder of rotary kiln 1 is established two grades and supported support roller 2, uses the rotary kiln of two retaining support rollers of stable simple beam structure, the operation of the sedimentation of brace foundation and rotary kiln is changed insensitive, the basis changes, operation changes little to the influence of support load.Cylinder of rotary kiln 1 is rotatable, and under the driving of the transmission system that buncher and reductor are formed, cylinder of rotary kiln 1 supports rotation on the support rollers 2 at two grades, and its rotating speed is 0.4-4rpm, can realize the continuous stepless speed governing.
Referring to Fig. 3, the rolling bearing pedestal 4 that supports support roller 2 is seated on the support roller seat 21, and the revolute pair that supports between support roller 2 and the support roller seat 21 is a rolling bearing 41.
Accumulation of heat dam 3 is located at the discharging port of cylinder of rotary kiln 1, the barricade that extends internally for cylinder of rotary kiln 1 wall, make to possess all the time in the barricade and be used for to the photothermal high temperature chamotte of ignition point, the height on accumulation of heat dam 3 is 200-300mm, thickness is 100-150mm, build by laying bricks or stones by refractory material parcel steel skeleton material and to form, referring to shown in Figure 2, the steel skeleton 31 on accumulation of heat dam 3 has integrated attachment strap 33, baffle plate 34 and the bent plate 35 vertical with attachment strap 33, attachment strap 33 and cylinder of rotary kiln 1 peripheral steel plate 12 parallel and overlap joints, baffle plate 34 respectively inwardly and stretch out, the thickness of the part that extends internally greater than cylinder of rotary kiln 1 refractory masses 13, the part that stretches out forms the bent plate 35 of support flame retardant coating 32, and bent plate 35 is by baffle plate 34 50-100mm that stretches out vertically, and the 50-100mm that radially extends internally again forms; The flame retardant coating 32 on accumulation of heat dam 3 is built by laying bricks or stones by refractory material and is formed, and is connected as a single entity with the refractory masses 13 of cylinder of rotary kiln 1, wraps attachment strap 33, baffle plate 34 forms the barricade that extends to cylinder of rotary kiln 1 axis direction.The height on accumulation of heat dam 3 is guaranteed through having the grog of certain thermal capacity to accumulate in the dam after the calcining, constantly to the burner nozzle radiations heat energy.
Accumulation of heat dam 3 in the utility model is equivalent to one and uses refractory material to build the material pond that forms certain material capacity by laying bricks or stones at cylinder of rotary kiln 1 discharge end.In the running, material contains a certain amount of high temperature chamotte in the pond all the time.The heat that high temperature chamotte carries can be radiated the burner combustion zone, thereby improved the firing speed of fuel effectively, remedied the combustion-supporting lower deficiency of secondary air temperature degree of reduction calcining, quicken the burning of coal dust (or fuel), thereby make the fire coal and the AIR MIXTURES that are oxidizing atmosphere, be converted into the reduction flame under the anoxycausis condition rapidly, make the reduction grog before cooling off rapidly, be among a kind of useful reducing atmosphere; Second effect on accumulation of heat dam is: " dam " can be used as one good " windbreak ", caused combustion air to be of value to the well distributed of reduction calcining at kiln hood, avoid or alleviated contacting of the combustion air that contains a large amount of oxygen and high temperature chamotte, thus the oxidation again that has alleviated the reduction grog.
Assembling process of the present utility model: rolling bearing 41 and support roller 2 are assembled; Bearing block 4 is fixed on the support roller seat 21; The support roller 2 that is equipped with rolling bearing 41 is assemblied on the bearing block 4; Cylinder of rotary kiln 1 is supported on the support roller 2 by rolling ring 11; Accumulation of heat dam steel skeleton 31 is connected with the peripheral steel plate 12 of cylindrical shell; Build refractory material 13 and 32 by laying bricks or stones.
Working procedure of the present utility model is as follows:
1, reduction calcination rotary kiln material is imported continuously from feed end, rotary kiln has constant slope and rotation continuously, material draws off from discharge end continuously under the acting in conjunction of revolution lifting and gravity, and the burner of discharge end setting is calcined (referring to Fig. 1) to material simultaneously;
2, because the stopping of accumulation of heat dam, although discharge end in continual discharging, always has and a certain amount ofly is with hot grog to be accumulated under the dam, this part " unnecessary " heat that is carried by grog will be radiated the ignition zone (referring to Fig. 2) of burner;
3, the revolute pair that supports between support roller and the pedestal is used rolling bearing, and lubricant uses the lubricating grease of periodic replacement;
4, cylinder of rotary kiln supports on the support roller at two groups and rotates.
Utilize reduction calcination rotary kiln of the present utility model, the accumulation of heat on accumulation of heat dam and can solve the combustion-supporting burner that causes of the no high temperature secondary wind of reduction calcining and get angry difficult problem to getting angry the heat radiation effect in zone; Cylinder of rotary kiln adopts two retainings to support the structures of support rollers, and that stressed clearer and more definite, support load changes is little, investment cost is low, Installation and Debugging are easy, fault rate is low; The revolute pair that supports support roller adopts rolling bearing, greatly reduces frictional resistance, has improved transmission efficiency, and what the assembling process of rolling bearing need not to be provided with at the scene bearing shell manually scrapes a watt processing link, and the assembly precision of support roller is higher, more helps operation maintenance.
Claims (10)
1. chromic slag dry method detoxication reduction calcination rotary kiln, comprise the cylinder of rotary kiln that support support roller and frame rotate under transmission system drives on this support support roller, it is characterized in that: the discharging port of described cylinder of rotary kiln is established the accumulation of heat dam, the barricade that this accumulation of heat dam extends internally for the cylinder of rotary kiln wall.
2. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 1 is characterized in that the height 200-300mm on described accumulation of heat dam.
3. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 1 is characterized in that described accumulation of heat dam thickness 100-150mm.
4. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 1, it is characterized in that, described accumulation of heat dam is built by laying bricks or stones by refractory material parcel steel skeleton material and is formed, wherein steel skeleton comprises integrated attachment strap and the baffle plate vertical with attachment strap, attachment strap and the parallel and overlap joint of the peripheral steel plate of cylinder of rotary kiln, baffle plate extends internally; Build the flame retardant coating that forms the accumulation of heat dam by laying bricks or stones and the refractory masses of cylinder of rotary kiln is connected as a single entity by refractory material, it wraps baffle plate and forms described barricade.
5. chromic slag dry method detoxication according to claim 4 reduction calcination rotary kiln is characterized in that the steel skeleton on described accumulation of heat dam also comprises bent plate, and by the baffle plate 50-100mm that stretches out vertically, the 50-100mm that radially extends internally again forms.
6. according to the arbitrary described chromic slag dry method detoxication reduction calcination rotary kiln of claim 1 to 5, it is characterized in that described support support roller bottom is the support roller seat, the revolute pair that supports between support roller and the support roller seat is a rolling bearing.
7. chromic slag dry method detoxication according to claim 6 reverts back rotary kiln, it is characterized in that, establishes two and supports support roller, with the stage casing of simple beam structure balanced arrangement at cylinder of rotary kiln.
8. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 7 is characterized in that the rotating speed of described cylinder of rotary kiln is 0.4-4rpm.
9. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 6 is characterized in that the draw ratio of described cylinder of rotary kiln is 13-16.
10. chromic slag dry method detoxication reduction calcination rotary kiln according to claim 8 is characterized in that described cylinder of rotary kiln adopts the mode of speed governing to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201057530U CN202048779U (en) | 2011-04-12 | 2011-04-12 | Reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201057530U CN202048779U (en) | 2011-04-12 | 2011-04-12 | Reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202048779U true CN202048779U (en) | 2011-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201057530U Expired - Lifetime CN202048779U (en) | 2011-04-12 | 2011-04-12 | Reduction and calcination rotary kiln for dry-detoxification treatment on chromium residues |
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| CN (1) | CN202048779U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901117A (en) * | 2012-10-11 | 2013-01-30 | 中国科学院广州能源研究所 | Novel shaftless inclined rotary heat storage device |
| CN104140185A (en) * | 2014-08-06 | 2014-11-12 | 江西省广德环保科技有限公司 | Harmless recycling method for high-iron-chromium sludge |
-
2011
- 2011-04-12 CN CN2011201057530U patent/CN202048779U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901117A (en) * | 2012-10-11 | 2013-01-30 | 中国科学院广州能源研究所 | Novel shaftless inclined rotary heat storage device |
| CN104140185A (en) * | 2014-08-06 | 2014-11-12 | 江西省广德环保科技有限公司 | Harmless recycling method for high-iron-chromium sludge |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111123 |
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| CX01 | Expiry of patent term |