CN210615009U - Waste sand thermal method regeneration equipment - Google Patents
Waste sand thermal method regeneration equipment Download PDFInfo
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- CN210615009U CN210615009U CN201920872557.2U CN201920872557U CN210615009U CN 210615009 U CN210615009 U CN 210615009U CN 201920872557 U CN201920872557 U CN 201920872557U CN 210615009 U CN210615009 U CN 210615009U
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Abstract
The utility model discloses a waste sand thermal method regeneration facility has high-order regenerator, baking system and dust remover, wherein: the high-order regenerator supplies sand materials through a first sending tank, a middle sand hopper and a two-way sending sand material roasting system of the sending tank which are connected in sequence; the roasting system comprises a roasting roller and a gas burner loaded in the roasting roller, and is provided with a cooling roller connected to the discharge end of the roasting roller; the dust remover is respectively connected with the high-order regenerator and the roasting system. The utility model discloses the new sand volume of useless sand thermal method regeneration facility and technological method through reducing the purchase, reduces the useless sand volume of handling and landfill, and the material is recycled, practices thrift new sand purchasing cost, practices thrift solid useless emission landfill expense and to the pollution of environment, and no VOC discharges, reduces the cost of transportation, reduces the quantity of required chemical binder and additive to provide economic and environmental benefit.
Description
Technical Field
The utility model relates to a resin ash that casting chemical bonding machine core sand waste and resin sand produced carries out the regeneration of heat method and retrieves for casting trade technical field especially relates to waste sand heat method regeneration facility and waste sand heat method regeneration technology.
Background
The existing waste sand regeneration process method comprises the following steps: crushing, coarse screening, magnetic separation, roasting, and grading and screening to obtain the reclaimed sand.
Among the above-mentioned processes, the roasting process is an important part of the regeneration process of foundry waste sand. In the prior art, waste sand is heated and roasted by a thermocouple, separated sand is separated by a dust remover, and the separated sand is cooled and screened to obtain reclaimed sand. The process method has large energy consumption, complex structure and direct exhaust of waste gas, and does not meet the requirement of environmental protection.
The method comprises the steps of roasting and heating waste sand of a casting core of a chemical bonding machine to 650 plus 815 ℃, roasting and oxidizing residual chemical bonding resin and a curing agent to remove combustible chemical organic matters from the casting sand (silica sand, ceramsite sand, jewel sand, chromite sand and the like), wherein the LOI (loss of index) ignition loss of the casting core sand is reduced to about 0.1 percent, the standard of core making or new molding sand is met, flame is not directly combusted on the surface of the sand, and the sand is protected from damage caused by overburning.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of above-mentioned prior art, the utility model provides a sending jar one and middle sand fill, sending jar two to sending sand material roasting system supply sand material that have high-order regenerating machine through connecting gradually to roasting system includes roasting drum and loads the gas burner in it, roasting system still has the cooling cylinder who connects in roasting drum discharge end, the dust remover connects high-order regenerating machine and roasting system's useless sand thermal method regeneration facility respectively and because the useless sand thermal method regeneration technology of this equipment. Specifically, the waste sand thermal method regeneration equipment heats the roasting roller from the outside through the roasting roller and the gas burner loaded in the roasting roller, the waste sand is heated to 650-815 ℃ through conduction through the heating structure, the indirect heating can prevent the sand grains from being directly burnt by flame and protect the sand grains from being damaged by over burning, the organic chemical adhesive is completely oxidized in the heat recovery device through evaporating moisture and oxidizing the organic adhesive through roasting, and therefore the quality of the regenerated sand is improved. The dust remover is respectively connected with the high-order regenerator and the roasting system, so that dust in each regeneration link can be timely and effectively removed, and the technical purpose of environmental protection is achieved. The utility model adopts the technical proposal that: the hot method regeneration facility of sand that gives up has high order regenerator, roasting system and dust remover, wherein:
the high-order regenerator supplies sand materials through a first sending tank, a middle sand hopper and a two-way sending sand material roasting system of the sending tank which are connected in sequence;
the roasting system comprises a roasting roller and a gas burner loaded in the roasting roller, and is provided with a cooling roller connected to the discharge end of the roasting roller;
the dust remover is respectively connected with the high-order regenerator and the roasting system.
Furthermore, the discharging end of the roasting roller is provided with an exhaust hood and a discharging chute, and the feeding end of the cooling roller, which is positioned at the bottom of the discharging chute, is provided with a cold air collecting hood so as to convey the material to the cooling roller with higher speed after the material is cooled and collected through hot air in the roasting roller.
Further, the discharge end of the cooling drum screens the reclaimed sand fines into an air classifier through a ring of screens arranged circumferentially along the inner wall of the cooling drum, and the air classifier:
-comprising a distributor with inclined guide plates;
-the inclined material guiding plate is provided with a plurality of material guiding outlets;
-having a recovery conduit to connect a dust separator for dust removal.
Furthermore, the roasting roller feed end is connected at the roasting hopper through a spiral constant feeder to realize the quantitative feeding to the roasting roller, and the purpose of these two devices is to control the burning of the sand in the roasting roller and realize the automatic entering at regular time.
And further, a material guide outlet of the distributing device is connected with the transition hopper and the sending tank III to send the regenerated sand to the finished sand hopper.
Furthermore, the high-level regenerator is also connected with a vibrating conveyor, a large-inclination-angle belt conveyor and an iron remover to automatically provide the raw materials of the regenerated sand materials into the high-level regenerator.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the operation cost is low, the typical fuel gas consumption is that 1 ton of reclaimed sand consumes 14 kg of natural fuel gas, calculated according to 3 yuan/kg, the reclaimed sand directly burns with the cost of 42 yuan/ton.
2. The environment is protected and the energy is saved; the organic chemical binder is completely oxidized in the heat exchanger. The dust collector removes fine particles from the waste gas of the sand extractor and the air classifier, and the harmful substances are circularly and thermally treated, thereby achieving zero emission. The thermal method sand regeneration system adopts a human-computer interface automatic control system, and the labor is less.
3. Reliable design, low maintenance and energy conservation: the burnt sand with high heat of 650-815 ℃ is cooled by using the cooling roller with temperature reduction, a cooling water tower does not need to be matched (the arrangement needs frequent maintenance), and the waste heat of the air of heat exchange is utilized as combustion-supporting air to play a role in saving energy for the combustor.
To sum up, the utility model discloses the new sand volume of useless sand thermal method regeneration facility through reducing the purchase, reduces the useless sand volume of handling and landfill, and the material is recycled, practices thrift new sand purchasing cost, practices thrift solid useless emission landfill expense and to the pollution of environment, and no VOC discharges, reduces the cost of transportation, reduces the quantity of required chemical binder and additive to provide economic and environmental benefit.
Drawings
FIG. 1 is a front view of a thermal reclamation apparatus for spent sand;
FIG. 2 is a structural diagram of a roasting system of a waste sand thermal regeneration facility;
FIG. 3 is a structural view in the A direction of the baking system;
FIG. 4 is a heat recovery flow diagram of a roasting system;
wherein: 1-a vibration conveyor, 2-a large-inclination belt conveyor, 3-a de-ironing separator, 4-a high-position regenerator, 5-a first sending tank, 6-a first electric control cabinet, 7-a middle sand hopper, 8-a second sending tank, 9-a roasting system, 91-an air classifier, 911-an inclined material guide plate, 912-a distributor, 913-a material guide outlet and 914-a recovery pipeline; 92-a spiral constant feeder, 93-a roasting roller, 94-a gas burner and 941-a burner unit; 95-an exhaust hood, 96-a blanking chute, 97-a cold air collecting hood, 98-a cooling roller and 981-a cold air inlet; 99-mesh, 910-discharge end, 915 heat exchanger, 916-roasting hopper; 10-a finished product sand hopper, 11-a dust remover, 12-an electrical control cabinet II, 13-a transition hopper, 14-a sending tank III, 15-a sending tank V, 16-a dust removal induced draft fan and 17-a recovery induced draft fan.
Detailed Description
In order to deepen the understanding of the present invention, the present invention is further explained with reference to the drawings and the embodiments, which are only used to explain the present invention and are not limited to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the combination or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, in the description process of the embodiment of the present invention, the position relationships of the devices such as "up", "down", "front", "back", "left", "right" in all the drawings all use fig. 1 as a standard.
As shown in FIG. 1, the waste sand thermal method regeneration equipment comprises a high-level regenerator 4, a roasting system 9 and a dust remover 11, wherein:
the high-order regenerator 4 supplies sand to a sand-sending roasting system 9 through a first sending tank 5, a middle sand hopper 7 and a second sending tank 8 which are connected in sequence;
a roasting system 9 including a roasting drum 93 and a gas burner 94 loaded therein, having a cooling drum 98 connected to a discharge end of the roasting drum 93;
the dust remover 11 is respectively connected with the high-level regenerator 4 and the roasting system 9.
The exhaust hood 95 and the discharging chute 96 are arranged at the discharging end of the roasting roller 93, and the cold air collecting hood 97 is arranged at the feeding end of the cooling roller 98, which is positioned at the bottom of the discharging chute 96, so that the material is accelerated to be conveyed to the cooling roller 98 after being cooled and collected by hot air in the roasting roller. Fig. 1 shows a first electrical control cabinet 6 and a second electrical control cabinet 12, which are mainly used for centrally installing components such as electrical appliances, circuits and the like of nearby devices, so that centralized control and daily maintenance are facilitated.
As shown in fig. 2, the discharge end 910 of the cooling drum 98 screens the reclaimed sand fines into the air classifier 91 through a ring of screens 99 circumferentially arranged along the inner wall of the cooling drum 98, as shown in fig. 3, and the air classifier 91:
a distributor 912 having an inclined guide plate 911;
the inclined guide plate 911 is provided with a plurality of guide outlets 913;
a recovery duct 914 to connect the dust separator 11 for dust removal.
The roasting roller 93 has its feed end connected to the roasting hopper 916 via the quantitative spiral feeder 92 to feed the roasting roller 93 quantitatively, and these two devices are used to control the burning of sand inside the roasting roller and realize automatic timing.
A material guide outlet 913 of the distributor 912 is connected with the transition hopper 13 and the third sending tank 14 to send the regenerated sand to the finished sand hopper 10.
The high-level regenerator 4 is also connected with the vibrating conveyor 1, the large-inclination-angle belt conveyor 2 and the iron remover 3 to automatically provide the raw materials of the regenerated sand materials into the high-level regenerator.
As shown in fig. 1, the thermal regeneration process of waste sand based on the thermal regeneration equipment of waste sand at least comprises the following steps:
step one, coarse crushing and conveying: crushing and conveying the waste sand which is massive and contains iron by using a vibrating conveyor and a large-inclination-angle belt conveyor;
step two, magnetic separation: before the sand material reaches the high-level regenerator, the waste sand mixed after crushing is magnetically separated by using an iron remover, and ferromagnetic substances are separated and removed from the waste sand;
step three, high-order regeneration: and the waste sand after magnetic separation is sent into a high-level regenerator to be crushed, extruded and rubbed, and is screened in the crushing process, so that the resin adhered to the waste sand is crushed and falls off, and meanwhile, non-ferromagnetic small substances, the crushed resin adhered to the waste sand and dust are removed by induced air, so that the ignition decrement of the next thermal method regeneration equipment is reduced by 30 percent at least, and the next roasting cost is reduced.
Step four, roasting: sending the sand material subjected to the third-step high-order regeneration into a roasting system for roasting and cooling, and heating the sand material to 650-815 ℃ by using a heat conduction heating mode when roasting is carried out on a roasting roller; the residual chemical binder resin and the curing agent are roasted and oxidized to remove the combustible chemical organic substances such as the silica sand, the ceramsite sand, the precious pearl sand, the chromite sand and the like of the casting sand, the flue gas is subjected to reheating treatment after being recovered, the VOC in the flue gas is completely subjected to overheating high-temperature combustion and oxidation treatment, and the dust is recovered through a dust remover.
Specifically, the operation process of the roasting system is that the casting waste sand is sent into a roasting hopper 916 by a second sending tank 8, a screw quantitative feeder 92 sends the sand into a roasting roller 93 at a fixed quantitative speed, the roasting roller is made of heat-resistant stainless steel, a plurality of gas burner units 941 are installed outside the roasting roller, a heat-insulating furnace body (the inside is made of a high-temperature-resistant heat-insulating furnace lining material) is arranged outside the roasting roller 93, the roasting roller 93 is heated from the outside, the waste sand is heated to 650 + 815 ℃ through conduction, the indirect heating can prevent the sand from being directly burned by flame, the sand is protected from being damaged by overburning, and the moisture and the organic binder are evaporated through roasting. The combustor at the exhaust hood 95 reheats the exhausted flue gas to overheat all the VOC in the flue gas and burn and oxidize the VOC at high temperature. The roasted sand passes through the cold air collecting cover 97 from the chute 96 downwards to cool the burnt high-heat sand, and the waste heat of the heat-exchange air is utilized as combustion-supporting air for the burner, thereby saving energy. The final sand temperature is about 5-15 c above ambient temperature as it is conveyed through the cooling drum 98. The reclaimed sand is filtered by an annular screen 99 at the tail end of the cooling roller, materials larger than screen holes are discharged from a discharge end 910, and the reclaimed sand flows through an air classifier 911 to remove dust and fine powder, so that the required reclaimed sand is obtained.
And fifthly, screening and grading, namely screening and grading the regenerated sand material discharged from the cooling roller by using an air classifier, feeding the fine sand material into a dust remover through a pipeline, and sending the regenerated coarse sand material to a finished product sand hopper for storage through a sending tank IV.
The detailed process of screening and grading, shown in fig. 2 and 3, is as follows:
the reclaimed sand with large particles and impurities removed enters an air classifier 911, the reclaimed sand flows downwards along the inclined surface of an inclined material guide plate 911 through a material distributor 912, the air enters the classifier through a material guide outlet 915, the sand flowing in the lamination mode is permeated by the air, the unwanted fine particles are carried to a recovery pipeline 17 by the air flow and discharged to a dust remover, and the recovered reclaimed sand flows out from the bottom of the material guide outlet 915 and the material distributor 912 and is sent to a finished sand hopper through a sending tank.
The better implementation mode is that when the cooling roller of the roasting system cools the sand, the sand at the discharge end in the cooling roller is ensured to be higher than the ambient temperature by 5-15 ℃ and then enters the air classifier for screening, so that the quality of the sand can be better ensured.
As shown in fig. 4, the exhaust hood 95 disposed at the discharge end of the gas burner of the roasting drum collects hot gas exhausted from the burner unit 941 of the gas burner 94, and then exchanges the hot gas with the heat exchanger 915, so that fresh cold air passes through the heat exchanger and enters the gas burner through a pipeline to support combustion, and cooled exhaust gas carries dust and enters the dust remover through a dust removal pipeline to be removed. To achieve this, the heat exchanger 915 recovers the gas introduced from the exhaust hood 95 to the outside of the gas burner 94 and the roasting drum 93 by a recovery induced draft fan 17 or to a single burner unit 941 for auxiliary combustion, as is apparent from fig. 4. As can be seen from fig. 4, the dust collector 11 sucks dust from each device by the induced draft fan 16, removes dust by the dust collector 11, and sends the dust to the baking hopper 915 for secondary treatment via the sending pot five 15 at the bottom of the dust collector.
The working processes of air waste heat utilization, zero discharge of harmful substances and dust removal are as follows:
A. starting a dedusting induced draft fan 16, starting the deduster 11 to work, and starting a recovery induced draft fan 17;
B. the burning system 94 ignites to bake the baking drum 93, the hot air after burning passes through the heat exchanger 915 through the dust removing pipeline, the fresh cold air enters from the air inlet under the action of the recycling induced draft fan 17, passes through the heat exchanger 915 and is used as combustion-supporting air to the burner along the pipeline, and simultaneously, because a gap exists between the two ends of the baking drum and the heat insulating layer, the hot air of the pipeline is used for carrying out air pressure sealing on the two ends.
C. Dust and harmful substances of the waste sand treated in the roasting roller 93 are collected by a dust collector through a dust removal pipeline, sent to a roasting hopper 916 through a pipeline by a sending tank five 15, and conveyed to the roasting roller 93 together with the waste sand for reheating treatment.
D. Cold air enters the cooling roller 98 through a pipeline to cool the materials, and finally enters the dust remover 11 through a pipeline 914, and the cooling roller 98 obtains cold air from a cold air inlet 981 of the cooling roller to cool the reclaimed sand in the working process.
Comprehensively speaking, the utility model discloses a waste sand thermal method regeneration facility and waste sand thermal method regeneration technology, heat 650 + 815 ℃ to the calcination of the casting core waste sand of chemical bonding machine, carry out the calcination oxidation to remaining chemical bond resin and curing agent and get rid of, make casting sand (silica sand, haydite sand, precious pearl sand, chromite sand etc.) get rid of the chemical organic matter part that can burn, it is about 0.1% that the LOI of casting core sand burns the decrement, reach the standard of making the core or molding new sand, flame directly burns to sand surface not, the protection sand grain does not have because the damage of overburning.
The embodiment of the present invention discloses a preferred embodiment, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention according to the above embodiment, and make different extensions and changes, but do not depart from the spirit of the present invention, all of which are within the protection scope of the present invention.
Claims (6)
1. Waste sand thermal method regeneration facility which characterized in that: having a high-level regenerator (4), a roasting system (9) and a dust separator (11), wherein:
the high-order regenerator (4) supplies sand to a sand-sending roasting system (9) through a first sending tank (5), a middle sand hopper (7) and a second sending tank (8) which are connected in sequence;
a roasting system (9) comprising a roasting drum (93) and a gas burner (94) loaded therein, having a cooling drum (98) connected to a discharge end of the roasting drum (93);
the dust remover (11) is respectively connected with the high-order regenerator (4) and the roasting system (9).
2. The apparatus for hot recycling of waste sand according to claim 1, characterized in that: an exhaust hood (95) and a discharging chute (96) are arranged at the discharging end of the roasting roller (93), and a cold air collecting hood (97) is arranged at the feeding end of the cooling roller (98) positioned at the bottom of the discharging chute (96).
3. The apparatus for hot recycling of waste sand according to claim 2, characterized in that: the discharge end (910) of the cooling drum (98) screens the reclaimed sand fines into the air classifier (91) through a ring of screens (99) arranged circumferentially along the inner wall of the cooling drum (98), and the air classifier (91):
-comprising a distributor (912) with an inclined guide plate (911);
-the inclined guide plate (911) is provided with a plurality of guide outlets (913);
-having a recovery duct (914) to connect the dust separator (11) for dust removal.
4. The apparatus for hot recycling of used sand according to claim 2 or 3, wherein: the feeding end of the roasting roller (93) is connected with a roasting hopper (916) through a spiral constant feeder (92).
5. The apparatus for hot recycling of waste sand according to claim 3, characterized in that: a material guide outlet (913) of the distributing device (912) is connected with the transition hopper (13) and the sending tank III (14) to send the regenerated sand to the finished product sand hopper (10).
6. The apparatus for hot recycling of waste sand according to claim 5, wherein: the high-level regenerator (4) is also connected with the vibrating conveyor (1), the large-inclination-angle belt conveyor (2) and the iron remover (3) to automatically provide the raw materials of the regenerated sand materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920872557.2U CN210615009U (en) | 2019-06-12 | 2019-06-12 | Waste sand thermal method regeneration equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920872557.2U CN210615009U (en) | 2019-06-12 | 2019-06-12 | Waste sand thermal method regeneration equipment |
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| CN210615009U true CN210615009U (en) | 2020-05-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2019
- 2019-06-12 CN CN201920872557.2U patent/CN210615009U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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