CN109654882A - A method of recycling cast waste sand is utilized based on compound roasting apparatus - Google Patents
A method of recycling cast waste sand is utilized based on compound roasting apparatus Download PDFInfo
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- CN109654882A CN109654882A CN201811381354.XA CN201811381354A CN109654882A CN 109654882 A CN109654882 A CN 109654882A CN 201811381354 A CN201811381354 A CN 201811381354A CN 109654882 A CN109654882 A CN 109654882A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/08—Arrangements of devices for charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/10—Arrangements of air or gas supply devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/14—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/16—Arrangements of cooling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Abstract
The invention discloses a kind of method utilized based on compound roasting apparatus to recycling cast waste sand, include the following steps: that S1. material is entered in blow tank by equal flitch, enters charging protective device subsequently into horizontal combustion chamber using impeller；S2. material is burned room bottom hot wind and advertises boiling, flows from combustion chamber one end to opposite other end, during which successively carries out three-level roasting, and the temperature of level-one roasting is 300-400 DEG C, time 10-20s；The temperature of second level roasting is 600-800 DEG C, time 180-240s；The temperature of three-level roasting is 850-900 DEG C, time 10-20s；S3. material enters wind preheating chamber after having roasted, and the material discharge after heat exchange is cooled to 200-300 DEG C with cold wind, and high-temp waste gas is discharged after also exchanging heat.Regeneration method drop temperature of the invention is lower than 300 DEG C, and furnace temperature heating rate is fast, is raised to the maturing temperature of material lower than 30 minutes, and the exhaust gas temperature being discharged is low, harmful substance is few.
Description
Technical field
The invention belongs to material roasting technology fields, and in particular to one kind is based on compound roasting apparatus to recycling cast waste sand
The method utilized.
Background technique
About 90% casting is produced using the technique of sand casting in casting industry.Manufacture the basic former material of sand mold
Material is casting model powder and moulding sand binder, common moulding sand binder can be divided into organic type (such as: phenolic resin, cold-box tree
Rouge etc.) and inorganic type (such as: clay, waterglass etc.), and common casting model powder is silica sand (20-140 mesh particle), it is general to produce
1 ton of casting can generate 1-1.5 tons of cast waste sand, and a large amount of silica sand derives from nature, and the scale development of foundry industry is necessarily led
Cause the discarding of a large amount of exploitations and the antiquated sand that largely contains hazardous substance of natural silica Sand resource.For the sustainable development of casting industry,
It is necessary to recycling utilization be carried out to cast waste sand, to protect our earth resource and environment.
A kind of method of presently disclosed cast waste sand thermal reclamation is to be heated to 700- in the roaster of vertical structure
Antiquated sand is roasted under the conditions of 800 DEG C, the impurity on silica sand surface is burnt out and is removed, to reach the regenerated purpose of demoulding.It is existing
Thermal reclamation method cast waste sand and waste gas burning are not enough, discharge amount of exhaust gas is big, and environment protecting is bad, heat waste dephasing
To higher.The main reason is that vertical roasting stove feeding manner is that from top to bottom, combustion chamber casts useless in bottom, fill process
Sand is heated, and the temperature of burning is not achieved, and the organic matter being sticked on cast waste sand just volatilizees discharge, and exhaust gas is without heat exchange
Direct outlet, heat loss is big, and temperature of shaking out is high, and energy consumption is high.Such as CN201620006956.7 discloses a kind of horizontal old sand roasting
Furnace is burnt, CN201710427201.3 then discloses another vertical roasting stove, both are two kinds of roastings commonly used in the prior art
Furnace is burnt, there is above-mentioned deficiencies.
Summary of the invention
It is an object of the invention to aiming at the problems existing in the prior art, design one kind based on compound roasting apparatus to casting
The method for making antiquated sand regeneration has the advantages that energy consumption is lower, efficiency of combustion is higher, more energy efficient, more environmentally friendly.
To achieve the above object, The technical solution adopted by the invention is as follows:
A method of recycling cast waste sand is utilized based on compound roasting apparatus,
The compound roasting apparatus is equipped with horizontal combustion chamber, and the horizontal combustion chamber is divided into combustion chamber and selection by winnowing impurity elimination room,
Combustion chamber with selection by winnowing impurity elimination room is mutually transverse is connected to；
One end outside combustion chamber far from selection by winnowing impurity elimination room is equipped with feeding mechanism, and feeding mechanism is for conveying object into combustion chamber
Material；Combustion chamber side is equipped with multiple combustion guns, and combustion gun is towards combustion chamber spray combustion flame；Bottom of combustion chamber is arranged with
Multiple blast caps, the lower end of blast cap are communicated with hot wind bellows, and hot wind bellows include the first air inlet, hot wind from the first air inlet into
After entering hot wind bellows, it is blown into combustion chamber through blast cap；
Heat Room is communicated with above selection by winnowing impurity elimination room, Heat Room upper end is equipped with the first air outlet, the height generated after roasting
Warm exhaust gas is discharged after entering Heat Room from the first air outlet；It is equipped with heat exchanger in Heat Room, is provided with multiple heat exchange on heat exchanger
Pipe；Heat exchanger includes the second air inlet and the second air outlet, and cold wind enters heat exchanger from the second air inlet, with high-temp waste gas heat
Become hot wind after exchange to be discharged from the second air outlet；Second air outlet is connect with the first air inlet, the hot wind of the second air outlet
Enter in hot wind bellows from the first air inlet；
Wind preheating chamber is communicated with below selection by winnowing impurity elimination room, wind preheating chamber lower end is equipped with discharge nozzle, the high temperature substrate after roasting
After material falls into wind preheating chamber, the discharge nozzle discharge through wind preheating chamber lower end drops into collection hopper, and is discharged from discharge port；Wind preheating
Interior is equipped with several spiral heat exchange tubes, and the upper end of spiral heat exchange tube is equipped with tuyere, and lower end is connected to cold wind bellows, cold wind bellows packet
Containing third air inlet, cold wind sequentially enters cold wind bellows and spiral heat exchange tube from third air inlet, passes through in wind preheating chamber
After high-temperature material heat exchange after spiral heat exchange tube and roasting, it is blown into selection by winnowing impurity elimination room from tuyere；
It is described that the method that recycling cast waste sand utilizes is included the following steps: based on compound roasting apparatus
S1. material is entered in blow tank by equal flitch, enters charging protective device subsequently into horizontal using impeller
The combustion chamber of combustion chamber；
S2. material is burned room bottom hot wind and advertises boiling, flows from combustion chamber to selection by winnowing impurity elimination room, during which passes through burning
Rifle successively carries out three-level roasting, and the temperature of level-one roasting is 300-400 DEG C, time 10-20s；Second level roasting temperature be
600-800 DEG C, time 180-240s；The temperature of three-level roasting is 850-900 DEG C, time 10-20s；
S3. wind preheating chamber is fallen into from selection by winnowing impurity elimination room after material has roasted, preheats the cold of indoor spiral heat exchange tube with wind
Wind heat exchange discharges after being cooled to 200-300 DEG C, and the hot wind that spiral heat exchange tube is got in return is blown into selection by winnowing impurity elimination room by tuyere, makes to roast
Material afterwards is in fluidized state, and the friction increased between material and material reaches further impurity elimination effect；The roasting of sundries material
It is discharged after the exhaust gas of generation and the cold wind heat exchange cooling of the heat exchanger on wind preheating chamber top, the hot wind that heat exchanger is got in return enters hot wind
In bellows.
The present invention is provided with equal flitch above dispenser, and material is by equal flitch even into falling into burning after dispenser
Room can make material be uniformly distributed, material accumulation is avoided can not boil together in this way.Into after combustion chamber, material is had
Two kinds of motion states, and the reason of generating both motion states, is because the structure of roasting apparatus is different: horizontal Duan Yuli
Formula section.Horizontal section mainly makes material boil in the combustion chamber by high pressure blower or compressed air, then to the casting of boiling
Antiquated sand and exhaust gas carry out three-level roasting, and the temperature of level-one roasting is 300-400 DEG C, time 10-20s；The temperature of second level roasting
It is 600-800 DEG C, time 180-240s；The temperature of three-level roasting is 850-900 DEG C, time 10-20s.It is roasted by three-level
It burns, makes cast waste sand and exhaust gas full combustion, no harmful, organic gas volatilization substantially increases the demolding rate of cast waste sand, goes
Miscellaneous effect and stability.Vertical section mainly enters wind preheating chamber by material from top to bottom, and high-pressure blast is by being embedded in material
Spiral heat exchange tube and the material of high temperature exchange heat, obtain hot wind, on the one hand guarantee that temperature will not reduce in roasting apparatus, one
Aspect cools down material.Sufficient heat exchange, so that the drop temperature of material is at 200-300 DEG C, and other castings are useless
The drop temperature of sand thermal reclamation is at 500-600 DEG C.Heat exchanger is connected to above wind preheating chamber, due to the air outlet at the top of heat exchanger
The exhaust gas of the negative pressure of generation, high temperature rises, and carries out heat exchange with the cold wind advertised on heat exchanger, and cold wind is preheated,
The waste heat of exhaust gas is reduced also by heat exchanger.By above-mentioned heat exchange twice, the hot wind after preheating is supplied to burning
Boil material and preheating material on room；Heat insulation effect is good, and heating rate is fast when making to open furnace, is raised to the maturing temperature of material lower than 30
Minute, and other cast waste sand thermal reclamations produce heating and need 90-120 minutes.The present invention greatly reduces the energy consumption of roaster,
Energy conservation and environmental protection.
Preferably, the temperature of the level-one roasting is 400 DEG C, time 15s；The temperature of second level roasting is 700 DEG C, the time
For 240s；The temperature of three-level roasting is 850 DEG C, time 10s.
Preferably, it is connected to heat exchanger above the wind preheating chamber, it is high due to the negative pressure that the air outlet at the top of heat exchanger generates
The hot wind of temperature rises, and carries out heat exchange with the cold wind advertised on heat exchanger, and cold wind is preheated；The hot wind after preheating
It is supplied to combustion chamber use.
Preferably, the combustion chamber and selection by winnowing impurity elimination room were raised to the maturing temperature of material lower than 30 minutes.
Preferably, insulating layer is provided with outside the Heat Room.
Preferably, the side wall of the combustion chamber and selection by winnowing impurity elimination room is followed successively by heat resistant and wear resistant material, heat preservation from inside to outside
Layer and shell.
Preferably, the top of the combustion chamber and selection by winnowing impurity elimination room is followed successively by heat resistant and wear resistant material, heat preservation from inside to outside
Layer and shell.
Preferably, the combustion chamber is equipped with far from the one end side of selection by winnowing impurity elimination room and repairs into hole.
Preferably, the discharge nozzle is located at the part in collection hopper equipped with pneumatic blowing material system, and pneumatic blowing material system is from out
The export direction of the inside of expects pipe towards discharge nozzle is blown.
Preferably, the impeller is driven by driving motor, and the lower part of impeller is feed inlet, feed inlet and combustion chamber
Between be equipped with charging protective device.
Compared with prior art, beneficial effects of the present invention:
1, by heat exchange twice, keep material and hot air heat exchange effect stronger, heat loss is small, and the abundant energy consumption of heat energy utilization is more
It is low.The gas that the tuyere that the upper end of spiral heat exchange tube is set is produced by boasting also makes sand be in fluidized state, rubs between sand and sand,
Enhance impurity elimination effect.
2, multi-stage baking and channel space limitation make material and exhaust gas obtain more fully roasting, and substantially increase material
Demolding rate, impurity elimination effect and reduce discharge amount of exhaust gas, it is more environmentally friendly.
3, duplex makes material preheat from one end to opposite other end flowing by the hot wind obtained by heat exchange, is multistage
Roasting exchanges heat twice, and drop temperature is lower than 300 DEG C, and furnace temperature heating rate is fast, and the maturing temperature for being raised to material is lower than 30 minutes,
And the exhaust gas temperature of discharge is low, harmful substance is few, and the energy consumption of generation is lower, more environmentally friendly.
Detailed description of the invention
Fig. 1 is the side structure schematic diagram of the compound roasting apparatus of the present invention；
Fig. 2 is the overlooking structure diagram of the compound roasting apparatus of the present invention；
Fig. 3 is the cross-sectional view of B-B in Fig. 1；
Fig. 4 is the cross-sectional view of C-C in Fig. 2；
Fig. 5 is the cross-sectional view of A-A in Fig. 1；
Fig. 6 is the schematic perspective view of the compound roasting apparatus of the present invention；
Each label meaning in figure are as follows: 1. driving motors, 2. blow tanks, 3. impellers, 4. feed inlets, 5. charging protective devices,
6. shell, 7. heat preservation rocks, 8. refractory brick, 9. hot wind bellows, 10. blast caps, 11. repair into hole, 12. combustion guns, 13. horizontal combustions
Burn room, the combustion chamber 13-1., 13-2. selection by winnowing impurity elimination room, 14. Heat Rooms, 15. second air outlets, 16. second air inlets, 17. wind
Mouth, 18. spiral heat exchange tubes, 19. wind preheating chambers, 20. cold wind bellows, 21. third air inlets, 22. discharge nozzles, 23. collection hoppers,
24. discharge port, 25. pneumatic blowing material systems, 26. first air outlets, the air inlet of 27. pneumatic blowing material systems, 28. first air inlets
Mouthful, 29. supports.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment and
Attached drawing, the present invention is described in more detail, but the present invention claims protection scope be not limited to embodiment.
Embodiment 1:
A method of recycling cast waste sand is utilized based on compound roasting apparatus, is included the following steps:
S1. material is entered in blow tank by equal flitch (being not drawn into attached drawing), enters charging protection dress using impeller
Set the combustion chamber subsequently into horizontal combustion chamber；
S2. material is burned room bottom hot wind and advertises boiling, flows from combustion chamber to selection by winnowing impurity elimination room, during which passes through burning
Rifle successively carries out three-level roasting, and the temperature of level-one roasting is 300 DEG C, time 10s；The temperature of second level roasting is 600 DEG C, the time
For 240s；The temperature of three-level roasting is 850 DEG C, time 10s；
S3. wind preheating chamber is fallen into from selection by winnowing impurity elimination room after material has roasted, preheats the cold of indoor spiral heat exchange tube with wind
Wind heat exchange discharges after being cooled to 200 DEG C, and the hot wind that spiral heat exchange tube is got in return is blown into selection by winnowing impurity elimination room by tuyere, after making roasting
Material is in fluidized state, and the friction increased between material and material reaches further impurity elimination effect；Material roasting generates useless
It is discharged after gas and the cold wind heat exchange cooling of the heat exchanger on wind preheating chamber top, the hot wind that heat exchanger is got in return enters in hot wind bellows.
The compound roasting apparatus is equipped with horizontal combustion chamber, and the horizontal combustion chamber is divided into combustion chamber and selection by winnowing impurity elimination room,
Combustion chamber with selection by winnowing impurity elimination room is mutually transverse is connected to；
One end outside combustion chamber far from selection by winnowing impurity elimination room is equipped with feeding mechanism, and feeding mechanism is for conveying object into combustion chamber
Material；Combustion chamber side is equipped with multiple combustion guns, and combustion gun is towards combustion chamber spray combustion flame；Bottom of combustion chamber is arranged with
Multiple blast caps, the lower end of blast cap are communicated with hot wind bellows, and hot wind bellows include the first air inlet, hot wind from the first air inlet into
After entering hot wind bellows, it is blown into combustion chamber through blast cap；
Heat Room is communicated with above selection by winnowing impurity elimination room, Heat Room upper end is equipped with the first air outlet, the height generated after roasting
Warm exhaust gas is discharged after entering Heat Room from the first air outlet；It is equipped with heat exchanger in Heat Room, is provided with multiple heat exchange on heat exchanger
Pipe；Heat exchanger includes the second air inlet and the second air outlet, and cold wind enters heat exchanger from the second air inlet, with high-temp waste gas heat
Become hot wind after exchange to be discharged from the second air outlet；Second air outlet is connect with the first air inlet, the hot wind of the second air outlet
Enter in hot wind bellows from the first air inlet；
Wind preheating chamber is communicated with below selection by winnowing impurity elimination room, wind preheating chamber lower end is equipped with discharge nozzle, the high temperature substrate after roasting
After material falls into wind preheating chamber, the discharge nozzle discharge through wind preheating chamber lower end drops into collection hopper, and is discharged from discharge port；Wind preheating
Interior is equipped with several spiral heat exchange tubes, and the upper end of spiral heat exchange tube is equipped with tuyere, and lower end is connected to cold wind bellows, cold wind bellows packet
Containing third air inlet, cold wind sequentially enters cold wind bellows and spiral heat exchange tube from third air inlet, passes through in wind preheating chamber
After high-temperature material heat exchange after spiral heat exchange tube and roasting, it is blown into selection by winnowing impurity elimination room from tuyere.
Heat exchanger is connected to above the wind preheating chamber, due to the negative pressure that the air outlet at the top of heat exchanger generates, the heat of high temperature
Wind rises, and carries out heat exchange with the cold wind advertised on heat exchanger, and cold wind is preheated；Hot wind after preheating is supplied to combustion
Room is burnt to use.Insulating layer is provided with outside the Heat Room.
The combustion chamber and selection by winnowing impurity elimination room were raised to the maturing temperature of material lower than 30 minutes.
Embodiment 2:
A method of recycling cast waste sand is utilized based on compound roasting apparatus, is included the following steps:
S1. material is entered in blow tank by equal flitch (being not drawn into attached drawing), enters charging protection dress using impeller
Set the combustion chamber subsequently into horizontal combustion chamber；
S2. material is burned room bottom hot wind and advertises boiling, flows from combustion chamber to selection by winnowing impurity elimination room, during which passes through burning
Rifle successively carries out three-level roasting, and the temperature of level-one roasting is 400 DEG C, time 20s；The temperature of second level roasting is 800 DEG C, the time
For 180s；The temperature of three-level roasting is 900 DEG C, time 20s；
S3. wind preheating chamber is fallen into from selection by winnowing impurity elimination room after material has roasted, preheats the cold of indoor spiral heat exchange tube with wind
Wind heat exchange discharges after being cooled to 300 DEG C, and the hot wind that spiral heat exchange tube is got in return is blown into selection by winnowing impurity elimination room by tuyere, after making roasting
Material is in fluidized state, and the friction increased between material and material reaches further impurity elimination effect；Material roasting generates useless
It is discharged after gas and the cold wind heat exchange cooling of the heat exchanger on wind preheating chamber top, the hot wind that heat exchanger is got in return enters in hot wind bellows.
The compound roasting apparatus is equipped with horizontal combustion chamber, and the horizontal combustion chamber is divided into combustion chamber and selection by winnowing impurity elimination room,
Combustion chamber with selection by winnowing impurity elimination room is mutually transverse is connected to；
One end outside combustion chamber far from selection by winnowing impurity elimination room is equipped with feeding mechanism, and feeding mechanism is for conveying object into combustion chamber
Material；Combustion chamber side is equipped with multiple combustion guns, and combustion gun is towards combustion chamber spray combustion flame；Bottom of combustion chamber is arranged with
Multiple blast caps, the lower end of blast cap are communicated with hot wind bellows, and hot wind bellows include the first air inlet, hot wind from the first air inlet into
After entering hot wind bellows, it is blown into combustion chamber through blast cap；
Heat Room is communicated with above selection by winnowing impurity elimination room, Heat Room upper end is equipped with the first air outlet, the height generated after roasting
Warm exhaust gas is discharged after entering Heat Room from the first air outlet；It is equipped with heat exchanger in Heat Room, is provided with multiple heat exchange on heat exchanger
Pipe；Heat exchanger includes the second air inlet and the second air outlet, and cold wind enters heat exchanger from the second air inlet, with high-temp waste gas heat
Become hot wind after exchange to be discharged from the second air outlet；Second air outlet is connect with the first air inlet, the hot wind of the second air outlet
Enter in hot wind bellows from the first air inlet；
Wind preheating chamber is communicated with below selection by winnowing impurity elimination room, wind preheating chamber lower end is equipped with discharge nozzle, the high temperature substrate after roasting
After material falls into wind preheating chamber, the discharge nozzle discharge through wind preheating chamber lower end drops into collection hopper, and is discharged from discharge port；Wind preheating
Interior is equipped with several spiral heat exchange tubes, and the upper end of spiral heat exchange tube is equipped with tuyere, and lower end is connected to cold wind bellows, cold wind bellows packet
Containing third air inlet, cold wind sequentially enters cold wind bellows and spiral heat exchange tube from third air inlet, passes through in wind preheating chamber
After high-temperature material heat exchange after spiral heat exchange tube and roasting, it is blown into selection by winnowing impurity elimination room from tuyere.
The side wall and top of the combustion chamber and selection by winnowing impurity elimination room are followed successively by heat resistant and wear resistant material, insulating layer from inside to outside
And shell.
Embodiment 3:
A method of recycling cast waste sand is utilized based on compound roasting apparatus, which comprises the steps of:
S1. material is entered in blow tank by equal flitch (being not drawn into attached drawing), enters charging protection dress using impeller
Set the combustion chamber subsequently into horizontal combustion chamber；
S2. material is burned room bottom hot wind and advertises boiling, flows from combustion chamber to selection by winnowing impurity elimination room, during which passes through burning
Rifle successively carries out three-level roasting, and the temperature of level-one roasting is 400 DEG C, time 15s；The temperature of second level roasting is 700 DEG C, the time
For 240s；The temperature of three-level roasting is 850 DEG C, time 10s；
S3. wind preheating chamber is fallen into from selection by winnowing impurity elimination room after material has roasted, preheats the cold of indoor spiral heat exchange tube with wind
Wind heat exchange discharges after being cooled to 250 DEG C, and the hot wind that spiral heat exchange tube is got in return is blown into selection by winnowing impurity elimination room by tuyere, after making roasting
Material is in fluidized state, and the friction increased between material and material reaches further impurity elimination effect；Material roasting generates useless
It is discharged after gas and the cold wind heat exchange cooling of the heat exchanger on wind preheating chamber top, the hot wind that heat exchanger is got in return enters in hot wind bellows.
The compound roasting apparatus is equipped with horizontal combustion chamber, and the horizontal combustion chamber is divided into combustion chamber and selection by winnowing impurity elimination room,
Combustion chamber with selection by winnowing impurity elimination room is mutually transverse is connected to；
One end outside combustion chamber far from selection by winnowing impurity elimination room is equipped with feeding mechanism, and feeding mechanism is for conveying object into combustion chamber
Material；Combustion chamber side is equipped with multiple combustion guns, and combustion gun is towards combustion chamber spray combustion flame；Bottom of combustion chamber is arranged with
Multiple blast caps, the lower end of blast cap are communicated with hot wind bellows, and hot wind bellows include the first air inlet, hot wind from the first air inlet into
After entering hot wind bellows, it is blown into combustion chamber through blast cap；
Heat Room is communicated with above selection by winnowing impurity elimination room, Heat Room upper end is equipped with the first air outlet, the height generated after roasting
Warm exhaust gas is discharged after entering Heat Room from the first air outlet；It is equipped with heat exchanger in Heat Room, is provided with multiple heat exchange on heat exchanger
Pipe；Heat exchanger includes the second air inlet and the second air outlet, and cold wind enters heat exchanger from the second air inlet, with high-temp waste gas heat
Become hot wind after exchange to be discharged from the second air outlet；Second air outlet is connect with the first air inlet, the hot wind of the second air outlet
Enter in hot wind bellows from the first air inlet；
Wind preheating chamber is communicated with below selection by winnowing impurity elimination room, wind preheating chamber lower end is equipped with discharge nozzle, the high temperature substrate after roasting
After material falls into wind preheating chamber, the discharge nozzle discharge through wind preheating chamber lower end drops into collection hopper, and is discharged from discharge port；Wind preheating
Interior is equipped with several spiral heat exchange tubes, and the upper end of spiral heat exchange tube is equipped with tuyere, and lower end is connected to cold wind bellows, cold wind bellows packet
Containing third air inlet, cold wind sequentially enters cold wind bellows and spiral heat exchange tube from third air inlet, passes through in wind preheating chamber
After high-temperature material heat exchange after spiral heat exchange tube and roasting, it is blown into selection by winnowing impurity elimination room from tuyere.
The combustion chamber is equipped with far from the one end side of selection by winnowing impurity elimination room and repairs into hole.
The discharge nozzle is located at the part in collection hopper equipped with pneumatic blowing material system, and pneumatic blowing material system is out of discharge nozzle
The export direction of portion towards discharge nozzle is blown.
Comparative example 1:
Recycling cast waste sand is utilized using vertical roasting stove, being warming up to maturing temperature needs 90-120 minutes, drop temperature
500-600 DEG C, and the exhaust gas temperature being discharged is high, harmful substance contents are high.
Comparative example 2:
Compared with Example 1, three-level roasting technique is not used, directly primary roasting, since material and exhaust gas is not abundant
Burning, demolding rate, the impurity elimination effect of material are substantially reduced, and the exhaust gas harmful substance contents of generation are high.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to the one of invention
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in present specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (10)
1. a kind of method utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The compound roasting apparatus is equipped with horizontal combustion chamber, and the horizontal combustion chamber is divided into combustion chamber and selection by winnowing impurity elimination room, burns
Room with selection by winnowing impurity elimination room is mutually transverse is connected to；
One end outside combustion chamber far from selection by winnowing impurity elimination room is equipped with feeding mechanism, and feeding mechanism is for conveying material into combustion chamber；
Combustion chamber side is equipped with multiple combustion guns, and combustion gun is towards combustion chamber spray combustion flame；Bottom of combustion chamber is arranged with more
A blast cap, the lower end of blast cap are communicated with hot wind bellows, and hot wind bellows include the first air inlet, and hot wind enters from the first air inlet
After hot wind bellows, it is blown into combustion chamber through blast cap；
Heat Room is communicated with above selection by winnowing impurity elimination room, Heat Room upper end is equipped with the first air outlet, and the high temperature generated after roasting is useless
Gas is discharged after entering Heat Room from the first air outlet；It is equipped with heat exchanger in Heat Room, is provided with multiple heat exchanger tubes on heat exchanger；It changes
Hot device includes the second air inlet and the second air outlet, and cold wind enters heat exchanger from the second air inlet, with high-temp waste gas heat exchange
Become hot wind later to be discharged from the second air outlet；Second air outlet is connect with the first air inlet, and the hot wind of the second air outlet is from
One air inlet enters in hot wind bellows；
Wind preheating chamber is communicated with below selection by winnowing impurity elimination room, wind preheating chamber lower end is equipped with discharge nozzle, and the high-temperature material after roasting is fallen
After inlet air preheating chamber, the discharge nozzle discharge through wind preheating chamber lower end drops into collection hopper, and is discharged from discharge port；In wind preheating chamber
Equipped with several spiral heat exchange tubes, the upper end of spiral heat exchange tube is equipped with tuyere, and lower end is connected to cold wind bellows, and cold wind bellows include
Third air inlet, cold wind sequentially enter cold wind bellows and spiral heat exchange tube from third air inlet, pass through spiral in wind preheating chamber
After high-temperature material heat exchange after heat exchanger tube and roasting, it is blown into selection by winnowing impurity elimination room from tuyere；
It is described that the method that recycling cast waste sand utilizes is included the following steps: based on compound roasting apparatus
S1. material is entered in blow tank by equal flitch, enters charging protective device subsequently into horizontal burning using impeller
The combustion chamber of room；
S2. material be burned room bottom hot wind advertise boiling, from combustion chamber to selection by winnowing impurity elimination room flow, during which pass through combustion gun according to
Secondary progress three-level roasting, the temperature of level-one roasting are 300-400 DEG C, time 10-20s；The temperature of second level roasting is 600-800
DEG C, time 180-240s；The temperature of three-level roasting is 850-900 DEG C, time 10-20s；
S3. wind preheating chamber is fallen into from selection by winnowing impurity elimination room after material has roasted, the cold wind for preheating indoor spiral heat exchange tube with wind changes
Heat discharges after being cooled to 200-300 DEG C, and the hot wind got in return through spiral heat exchange tube is blown into selection by winnowing impurity elimination room by tuyere, after making roasting
Material be in fluidized state, the friction increased between material and material reaches further impurity elimination effect；Material roasting generates
It is discharged after exhaust gas and the cold wind heat exchange cooling of the heat exchanger on wind preheating chamber top, the hot wind that heat exchanger is got in return enters hot wind bellows
It is interior.
2. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The temperature of the level-one roasting is 400 DEG C, time 15s；The temperature of second level roasting is 700 DEG C, time 240s；Three-level roasting
Temperature be 850 DEG C, time 10s.
3. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
Heat exchanger is connected to above the wind preheating chamber, due to the negative pressure that the air outlet at the top of heat exchanger generates, the hot wind of high temperature rises, again
Heat exchange is carried out with the cold wind advertised on heat exchanger, cold wind is preheated.
4. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The combustion chamber and selection by winnowing impurity elimination room were raised to the maturing temperature of material lower than 30 minutes.
5. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
Insulating layer is provided with outside the Heat Room.
6. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The side wall of the combustion chamber and selection by winnowing impurity elimination room is followed successively by heat resistant and wear resistant material, insulating layer and shell from inside to outside.
7. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The top of the combustion chamber and selection by winnowing impurity elimination room is followed successively by heat resistant and wear resistant material, insulating layer and shell from inside to outside.
8. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The combustion chamber is equipped with far from the one end side of selection by winnowing impurity elimination room and repairs into hole.
9. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, which is characterized in that
The discharge nozzle is located at the part in collection hopper equipped with pneumatic blowing material system, and pneumatic blowing material system goes out from the inside of discharge nozzle direction
The export direction of expects pipe is blown.
10. the method according to claim 1 utilized based on compound roasting apparatus to recycling cast waste sand, feature are existed
In the impeller is driven by driving motor, and the lower part of impeller is feed inlet, and charging is equipped between feed inlet and combustion chamber
Protective device.
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| CN110252943A (en) * | 2019-06-12 | 2019-09-20 | 南通凯斯辛普森机械科技有限公司 | Antiquated sand thermal reclamation equipment and antiquated sand thermal reclamation technique |
| CN114562881A (en) * | 2022-03-01 | 2022-05-31 | 广西兰科资源再生利用有限公司 | Method for recycling casting waste sand based on vertical energy-saving roasting furnace |
| CN114799043A (en) * | 2022-03-31 | 2022-07-29 | 广西兰科资源再生利用有限公司 | Energy-saving circulating system for heat exchange and grinding of sand |
| CN114812183A (en) * | 2022-04-22 | 2022-07-29 | 驻马店市新创业管桩附件有限公司 | Precoated sand regenerating furnace capable of utilizing heat |
| CN115415477A (en) * | 2022-11-03 | 2022-12-02 | 托普工业(江苏)有限公司 | 3D prints casting sand mould recovery processing system |
| CN114562881B (en) * | 2022-03-01 | 2024-04-26 | 广西兰科资源再生利用有限公司 | Method for recycling foundry waste sand based on vertical energy-saving roasting furnace |
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| CN114799043A (en) * | 2022-03-31 | 2022-07-29 | 广西兰科资源再生利用有限公司 | Energy-saving circulating system for heat exchange and grinding of sand |
| CN114799043B (en) * | 2022-03-31 | 2024-01-26 | 广西兰科资源再生利用有限公司 | Energy-saving circulation system for grinding sand-to-sand heat exchange |
| CN114812183A (en) * | 2022-04-22 | 2022-07-29 | 驻马店市新创业管桩附件有限公司 | Precoated sand regenerating furnace capable of utilizing heat |
| CN115415477A (en) * | 2022-11-03 | 2022-12-02 | 托普工业(江苏)有限公司 | 3D prints casting sand mould recovery processing system |
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Denomination of invention: A method for recycling foundry waste sand based on compound roasting equipment Effective date of registration: 20220510 Granted publication date: 20200110 Pledgee: Bank of Guilin Co.,Ltd. Yulin Branch Pledgor: GUANGXI LANCO RESOURCES RECYCLING CO.,LTD. Registration number: Y2022450000069 |
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