CN103394308B - A kind of constant temperature adopting fused salt to heat turns round roasting system and technique thereof - Google Patents
A kind of constant temperature adopting fused salt to heat turns round roasting system and technique thereof Download PDFInfo
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- CN103394308B CN103394308B CN201310271919.XA CN201310271919A CN103394308B CN 103394308 B CN103394308 B CN 103394308B CN 201310271919 A CN201310271919 A CN 201310271919A CN 103394308 B CN103394308 B CN 103394308B
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Abstract
A kind of constant temperature adopting fused salt to heat turns round roasting system and technique thereof, fusion tank top is provided with molten salt circulating pump, molten salt circulating pump connects molten salt heater, fused salt connects cylinder reactor inlet header from molten salt heater, cylinder reactor outlet header is connected with fusion tank, cylinder reactor heat exchanger tube is provided with in cylinder reactor, cylinder reactor content is connected with material comminutor to entrance, the cylinder reactor other end is provided with grog outlet and heat exchanger exhaust outlet, utilize material continual violent rolling in cylinder, collision, be conducive to the being heated evenly property of material, Reaction time shorten, effectively avoid the wall bonding phenomenon occurred in material roasting process in conjunction with granulating technique simultaneously, technique adopts fused salt to be heat transferring medium, and utilize the better heat endurance of fused salt, higher heat transfer coefficient, better index drum reactor temperature uniformity, products obtained therefrom extraction efficiency is high, and grog quality is better.
Description
Technical field
The invention belongs to chemical industry solid material heat exchange reaction technology field, be specifically related to a kind of constant temperature adopting fused salt to heat and turn round roasting system and technique thereof.
Background technology
Flyash is the solid waste that coal-burning boiler is discharged with flue gas, and it is coal impurity melting when high-temp combustion, the glassy solids particulate formed through quenching.Flyash main chemical compositions is Al
2o
3and SiO
2, both reach more than 80% at sum.Comprehensive utilization flyash, extracting aluminium oxide, is a kind of high value added utilization of secondary resource.The research, at present from theoretical and experimental study, turn to pilot scale and industrial test research, but the technology path that can be used for suitability for industrialized production is still very limited.
Alkali roasting method is simple because of technique, and industrial applications makes some progress, but causes whole technique to have jejune or uneconomic place because of its intrinsic defect, makes to produce hard to carry on; Acidleach is followed the example of because it is high to the requirement of equipment corrosion resistant, and cost of investment is huge, and be in research that is theoretical and laboratory stage, the road of industrialization is also veryer long always; And reacting phase does not also realize suitability for industrialized production to the ammonium sulfate method that gentle, the quantity of slag also can obtain controlling, mainly this technique cannot solve ammonium sulfate and flyash baking mixed generation aluminum sulfate or the not high problem of alum production rate always: the fusing point of ammonium sulfate, alum is lower, molten condition is formed very soon in course of reaction, easily be adhered to reactor wall, and ammonium sulfate also easily decomposes, after decomposition cannot with Al in flyash
2o
3react, cause Al
2o
3recovery rate not high.Therefore, how can solve ammonium sulfate and flyash roasting problem preferably, be only the key on the road of ammonium sulfate method industrialization.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, a kind of constant temperature adopting fused salt to heat is the object of the present invention is to provide to turn round roasting system and technique thereof, utilize the heat-transfer character of fused salt and the kinetic characteristic of cylinder, reasonable Arrangement heat-transfer surface, realize constant temperature in cylinder, this device effectively can control the roasting time of material simultaneously, and that effectively avoids occurring in roasting is bonding, and can remote control, have reaction efficiency high, can continuously, stable, efficient, a large amount of material handling and the stable advantage of quality of finished.
In order to solve the problems of the technologies described above, the technical solution used in the present invention:
A kind of constant temperature revolution roasting system adopting fused salt to heat, comprise fusion tank 1, fusion tank 1 top is provided with molten salt circulating pump 2, the inlet duct of molten salt circulating pump 2 is deeply to fusion tank 1, the outlet conduit of molten salt circulating pump 2 connects molten salt heater 3 inlet duct, fused salt is connected to the cylinder reactor inlet header 4 of cylinder reactor 5 from molten salt heater 3 outlet conduit, the cylinder reactor outlet header 7 of cylinder reactor 5 is connected with fusion tank 1, cylinder reactor heat exchanger tube 6 is provided with in cylinder reactor 5, the cylinder reactor content of cylinder reactor 5 one end is connected to the outlet of entrance 9 with material comminutor 8.Cylinder reactor 5 other end is provided with grog outlet 10 and heat exchanger exhaust outlet 11, and cylinder reactor content exports 10 to entrance 9 horizontal level higher than grog.
Based on the roasting technique adopting the constant temperature of fused salt heating to turn round roasting system, it is characterized in that, comprise the following steps:
In step one, fusion tank 1, heating fused salt is to molten state, and deliver to molten salt heater 3 through circulating pump 2, fused salt is heated to 400 DEG C ~ 450 DEG C by molten salt heater 3;
Fused salt after step 2, heating enters into the cylinder reactor inlet header 4 of cylinder reactor 5, after heat exchanger tube 6 heat exchange, discharges be recycled to fusion tank 1 from the cylinder reactor outlet header 7 of cylinder reactor 5.
Step 3, flyash and ammonium sulfate are after by the mass ratio of 3:1, through comminutor 8, to be a granulated into granularity be the mixed material of 40 ~ 50mm; send in cylinder reactor 5 by cylinder reactor content to entrance 9; at the roasting temperature of 400 DEG C; control to ensure that material stops the reaction time and controls at 150 ~ 200 minutes in cylinder by drum rotation speed simultaneously; gained grog is discharged from grog discharge gate 10; the gas simultaneously generated in roasting process is reclaimed, for subsequent technique by heat exchanger exhaust outlet 11.
Can carry out after above-mentioned three step runnings working properly simultaneously.
Compared with prior art, advantage of the present invention is:
1) reactor adopts drum-type, can effectively control material roasting time by regulating rotation speed of drum; Simultaneously
In conjunction with granulating technique, control the suitable particle size of roasting material, can effectively avoid occurring bonding phenomenon in material roasting process.
2) roasting adopts indirect heat exchange baking modes, is convenient to the collection of grog; The off-gas recovery secondary being simultaneously convenient to generate in roasting process utilizes.
3) by regulating the output of molten salt circulating pump to change fused salt internal circulating load, in conjunction with drum reactor feature, can effective index drum reactor temperature distribution evenness along its length, guarantee that material has suitable reaction temperature in reactor overall process interval.
4) device adopts fused salt to be heat transferring medium, utilizes fused salt to have good heat endurance, heat transfer characteristic etc.;
In sum, the present invention have effectively avoid occurring in roasting that bonding phenomenon, temperature homogeneity are good, reaction efficiency is high, can continuous feeding and discharging, treating capacity is large, quality of finished is stable, the cycle of operation is long, be easy to grog collects, is easy to off-gas recovery and utilizes, be easy to that operation controls, the advantage such as energy-conservation.
Accompanying drawing explanation
Accompanying drawing is system schematic of the present invention.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of constant temperature revolution roasting system adopting fused salt to heat, described system comprises fusion tank 1, fusion tank 1 top is provided with molten salt circulating pump 2, the inlet duct of molten salt circulating pump 2 is deeply to fusion tank 1, the outlet conduit of molten salt circulating pump 2 connects molten salt heater 3 inlet duct, fused salt is connected to the cylinder reactor inlet header 4 of cylinder reactor 5 from molten salt heater 3 outlet conduit, the cylinder reactor outlet header 7 of cylinder reactor 5 is connected with fusion tank 1, cylinder reactor heat exchanger tube 6 is provided with in cylinder reactor 5, the cylinder reactor content of cylinder reactor 5 one end is connected to the outlet of entrance 9 with material comminutor 8.Cylinder reactor 5 other end is provided with grog outlet 10 and heat exchanger exhaust outlet 11, and cylinder reactor content exports 10 to entrance 9 horizontal level higher than grog.
Based on the roasting technique adopting the constant temperature of fused salt heating to turn round roasting system, it is characterized in that, comprise the following steps:
In step one, fusion tank 1, heating fused salt is to molten state, and deliver to molten salt heater 3 through circulating pump 2, fused salt is heated to 400 DEG C ~ 450 DEG C by molten salt heater 3;
Fused salt after step 2, heating enters into the cylinder reactor inlet header 4 of cylinder reactor 5, after heat exchanger tube 6 heat exchange, discharges be recycled to fusion tank 1 from the cylinder reactor outlet header 7 of cylinder reactor 5.
Step 3, flyash and ammonium sulfate are after by the mass ratio of 3:1, through comminutor 8, to be a granulated into granularity be the mixed material of 40 ~ 50mm; send in cylinder reactor 5 by cylinder reactor content to entrance 9; at the roasting temperature of 400 DEG C; control to ensure that material stops the reaction time and controls at 150 ~ 200 minutes in cylinder by drum rotation speed simultaneously; gained grog is discharged from grog discharge gate 10; the gas simultaneously generated in roasting process is reclaimed, for subsequent technique by heat exchanger exhaust outlet 11.
Reaction system of the present invention, take fused salt as heat transfer medium, utilize fused salt within the scope of 350 DEG C ~ 550 DEG C, have better heat endurance, feature compared with high heat transfer coefficient, fused salt is heated to uniform temperature by heater, drum reactor is delivered to by circulating pump, the mixed material of fused salt and ammonium sulfate and flyash is by indirect heat exchange mode, and heating mixed material reaches desired reaction temperature.
Fused salt enters cylinder reactor, is arranged and guarantees that cylinder has good temperature homogeneity along its length, provide good reaction environment to mixed material by rational heating surface; Simultaneously by the control of drum rotation speed, ensure that material stops the reaction time and controls more than 150 minutes in cylinder.
Ammonium sulfate and flyash adopt granulating technique, obtain the mixed material of suitable particle size, improve ammonium sulfate and the mutual contact of flyash, promote reacting to each other of storeroom.Drum reactor is in conjunction with granulating technique, and material rolls each other in cylinder, collision, can effectively avoid occurring bonding phenomenon in material roasting process.Fused salt after heat exchange is recycled to fused salt groove, reheats and recycles.
Core of the present invention is that one is adopt fused salt to be heat transfer medium, utilizes fused salt within the scope of 350 DEG C ~ 550 DEG C, have better heat endurance, advantage compared with high heat transfer coefficient; It two is the reaction unit of mixed material for selecting cylinder, and utilize the kinetic characteristic of cylinder, one is conducive to material is heated evenly, and improves the reactivity that material is mutual, shortens roasting time.Two carry out the tumbling motion by cylinder, and can effectively avoid material to occur in reactor materials from bonding that chemical reaction occurs simultaneously is in the phenomenon of cylinder reactor wall.
Fusion tank 1 of the present invention is for fused salt heating and store.
Roasting heat transferring medium of the present invention adopts fused salt, utilizes the good heat endurance of fused salt and higher heat transfer property.
Cylinder reactor 5 of the present invention utilizes drum proper, can effectively avoid occurring bonding in material roasting, is conducive to strengthening heat exchange simultaneously, shortens roasting time.
Cylinder reactor 5 of the present invention has certain angle of inclination, and cylinder reactor content designs at high point to entrance 9, and grog outlet 10 design, at lower, is guaranteed that material is discharged from grog outlet 10 smoothly, obtained required grog.
Cylinder reactor 5 of the present invention adopts gateway, two ends header+intermediate heat transfer pipe straight pipe type to arrange, avoids molten salt pipeline to occur dead band.
In the present invention, employing fused salt is heat transferring medium, gives full play to fused salt and have good heat endurance within the scope of 350 DEG C ~ 550 DEG C, and higher heat transfer coefficient advantage, adopts indirect heat exchange baking modes, is convenient to the collection of grog and generates the recovery of flue gas.Adopt drum reactor, control material and constantly carry out violent rolling, collision in cylinder, the heat transfer being conducive to material is even, Reaction time shorten; Simultaneously in conjunction with granulating technique, control the bonding phenomenon that material suitable particle size can effectively be avoided occurring in material roasting process.By regulating the output of molten salt circulating pump to control fused salt internal circulating load, can effective index drum reactor temperature distribution evenness along its length, guarantee that material has suitable reaction temperature interval in reactor overall process; Simultaneously by index drum rotating speed, effectively control the time of material roasting in reactor.Molten salt pipeline whole process adopts companion's heat, plays emptying effect before the preheating before startup and blowing out.This technique can realize continuous feed, discharging, exerts oneself large; The advantages such as the time of staying of material in reactor is longer and there is not dead band, and quality of finished is stable, extraction efficiency is high, the cycle of operation is long, be easy to operation control, energy-conservation.
Claims (2)
1. the constant temperature revolution roasting technique adopting fused salt to heat, utilize following system, described system comprises fusion tank (1), fusion tank (1) top is provided with molten salt circulating pump (2), the inlet duct of molten salt circulating pump (2) is deeply to fusion tank (1) bottom, the outlet conduit of molten salt circulating pump (2) connects molten salt heater (3) inlet duct, fused salt is connected to the cylinder reactor inlet header (4) of cylinder reactor (5) from molten salt heater (3) outlet conduit, the cylinder reactor outlet header (7) of cylinder reactor (5) is connected with fusion tank (1), cylinder reactor heat exchanger tube (6) is provided with in cylinder reactor (5), the cylinder reactor content of cylinder reactor (5) one end is connected to the outlet of entrance (9) with material comminutor (8), cylinder reactor (5) other end is provided with grog outlet (10) and heat exchanger exhaust outlet (11), cylinder reactor content exports (10) to entrance (9) horizontal level higher than grog, it is characterized in that, comprise the following steps:
In step one, fusion tank (1), heating fused salt is to molten state, and deliver to molten salt heater (3) through circulating pump (2), fused salt is heated to 400 DEG C ~ 450 DEG C by molten salt heater (3);
Fused salt after step 2, heating enters into the cylinder reactor inlet header (4) of cylinder reactor (5), after heat exchanger tube (6) heat exchange, discharge from the cylinder reactor outlet header (7) of cylinder reactor (5) and be recycled to fusion tank (1);
Step 3, flyash and ammonium sulfate are after by the mass ratio of 3:1, through comminutor (8), to be a granulated into granularity be the mixed material of 40 ~ 50mm; send in cylinder reactor (5) by cylinder reactor content to entrance (9); at the roasting temperature of 400 DEG C; control to ensure that material stops the reaction time and controls at 150 ~ 200 minutes in cylinder by drum rotation speed simultaneously; gained grog is discharged from grog outlet (10); the gas simultaneously generated in roasting process is reclaimed, for subsequent technique by heat exchanger exhaust outlet (11).
2. roasting technique according to claim 1, is characterized in that, described three steps can be carried out after system works runs well simultaneously.
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| CN103394308B true CN103394308B (en) | 2016-01-13 |
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| CN105366699A (en) * | 2014-08-28 | 2016-03-02 | 北京航天动力研究所 | Calcination and activation method and device for high-aluminum pulverized coal furnace flyash |
| CN106430142A (en) * | 2016-05-11 | 2017-02-22 | 湖北鑫固久技术装备有限公司 | Carbon microspheres obtained through salt bath heating production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3227891A1 (en) * | 1982-07-26 | 1984-01-26 | Peter 7869 Holzinshaus Voelskow | Rotary drum for the thermal treatment of loose materials |
| CN2869723Y (en) * | 2006-02-08 | 2007-02-14 | 孙学忠 | Novel multi-return-stroke drum heating apparatus |
| CN102636021A (en) * | 2012-04-11 | 2012-08-15 | 中钢集团马鞍山矿山研究院有限公司 | Efficient and energy-saving magnetizing roasting rotary kiln |
| CN203540498U (en) * | 2013-07-01 | 2014-04-16 | 中国华能集团清洁能源技术研究院有限公司 | Constant-temperature rotary roasting device |
-
2013
- 2013-07-01 CN CN201310271919.XA patent/CN103394308B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3227891A1 (en) * | 1982-07-26 | 1984-01-26 | Peter 7869 Holzinshaus Voelskow | Rotary drum for the thermal treatment of loose materials |
| CN2869723Y (en) * | 2006-02-08 | 2007-02-14 | 孙学忠 | Novel multi-return-stroke drum heating apparatus |
| CN102636021A (en) * | 2012-04-11 | 2012-08-15 | 中钢集团马鞍山矿山研究院有限公司 | Efficient and energy-saving magnetizing roasting rotary kiln |
| CN203540498U (en) * | 2013-07-01 | 2014-04-16 | 中国华能集团清洁能源技术研究院有限公司 | Constant-temperature rotary roasting device |
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