CN102688987A - Technology and equipment for recovering and reusing hot sand waste heat from lost foam - Google Patents
Technology and equipment for recovering and reusing hot sand waste heat from lost foam Download PDFInfo
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- CN102688987A CN102688987A CN2012101899326A CN201210189932A CN102688987A CN 102688987 A CN102688987 A CN 102688987A CN 2012101899326 A CN2012101899326 A CN 2012101899326A CN 201210189932 A CN201210189932 A CN 201210189932A CN 102688987 A CN102688987 A CN 102688987A
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Abstract
The invention discloses a technology and equipment for recovering and reusing hot sand waste heat from lost foam. The technology comprises the following steps: performing heat exchange between the hot sand produced by lost foam casting and thermodynamic media inside a first heat exchange set so as to transfer heat to the thermodynamic media; conveying the thermodynamic media heated by the hot sand to a heat sink of a corresponding workshop so as to rise the room temperature of the workshop; and conveying the thermodynamic mediums subjected to the heat emission inside the heat sink to the first heat exchange set again for recycle use. The invention also comprises equipment for realizing the technology. The equipment comprises the first heat exchange set for performing the heat exchange with the hot sand produced by lost foam, the first heat exchange set is communicated with the heat sink of the corresponding workshop through the thermodynamic media, and cycle device is arranged between the first heat exchange set and the heat sink. By using the technology and the equipment, the heat of the hot sand can be recovered, the recovered heat can be used in other technologies in lost foam production, therefore energy conservation and emission reduction can be realized, and the production cost can be reduced.
Description
Technical field
The present invention relates to the lost foam casting technical field, relate in particular to the technology and the equipment thereof of hot sand waste heat recovery of disappearance mould and utilization.
Background technology
In casting industry, the disappearance mould is one of emerging, state-of-the-art casting technique, and paraffin that the lost foam casting process normally earlier will be similar with the casting dimension shape or bubbles model bonding are combined into model; After brushing fireproof coating and oven dry, model is placed sandbox, insert the dry sand vibration molding then; Under negative pressure, pour into a mould at last, make the model gasification, liquid metals occupies modal position; Solidify the cooling back and form foundry goods, after foundry goods took out from sand mold, whole sand mold disappears became the sand that is scattered again; The initial temperature of these sands is very high, has 200-500 ℃ usually, and the temperature of the hot sand that some sand mold produces can be up to thousands of degrees centigrade; These hot sand only are cooled to just can reuse about 50 ℃, and at present the type of cooling to hot sand has three kinds usually: the one, hot sand is placed on the place natural drying of appointment, and let hot sand lower the temperature naturally; This mode is lowered the temperature very slow, thereby in whole disappearance mold technique, needs a large amount of dry sand turnovers, and the hot sand of airing also needs the place of certain area; Cause production cost higher, and very inconvenient; The 2nd, air-cooled, be about to hot sand and be placed on the specific equipment, ventilate to equipment, the heat of hot sand to be taken away, this mode cooling rate is also slow, and can produce the amounts of dust contaminated air, causes working environment very abominable; The 3rd, hot sand to be lowered the temperature through heat-exchanger rig, present heat-exchanger rig generally includes a cylinder that rotates around the axle center of self, and the axle center of cylinder is level or near horizontal direction normally; Hot sand is got into by an end of cylinder, is flowed out by the other end, and the top of cylinder is provided with a sparge pipe; Sparge pipe is to the outer surface water spray of cylinder, thereby the heat that absorbs cylinder makes the hot sand cooling in the cylinder, and present this heat-exchanger rig is lower usually to the cooling effectiveness of hot sand; And the weight of cylinder and hot sand is heavier, so the power that the head roll rotation need be very big, and the energy consumption when causing using is than higher; And water is sprinkled upon that a part forms steam behind the cylinder surface, liquid water then be sprinkled upon cylinder around, cause working environment very poor; The huge heat that these types of cooling to hot sand comprise hot sand has slatterned fully, does not obtain utilizing, and the order according to technological process in the production process of lost foam casting is typically provided with following work workshop: the pattern shop of modeling, be coated with the spray booth coated, will be coated with the drying chamber that the model coated is dried for model; Drying chamber also is divided into white mould drying chamber and Hei Mo drying chamber according to technology usually, and white mould drying chamber needs 25-50 degree centigrade room temperature usually, and black mould drying chamber needs 30-60 degree centigrade room temperature usually; Therefore need great amount of heat to keep the room temperature of drying chamber; When being in that winter, ambient temperature was low, for workman's work comfortable, other work workshop; Like spray booth; Pattern shops etc. all need heating, and used mode is for workshops such as drying chamber are provided with the special heating plant of a cover at present, adopts boiler heat supplying or electric calorifie installation heat supply usually; In whole disappearance mould production technology; The expense that needs for the heat supply in workshops such as drying chamber approximately will account for about 5% of whole technology cost, and the heat that hot sand produced can be supplied the disappearance mould heat that other technical process need fully, now but has no technology and equipment that the heat of hot sand is collected utilization.
Summary of the invention
Technical problem to be solved by this invention is: the technology that hot sand waste heat recovery of a kind of mould that disappears and utilization are provided; The heat of the hot sand that it can produce the disappearance mould reclaims and utilizes; For other links in the disappearance mould production technology provide heat; Practice thrift the energy of whole production technology, thereby reduce production costs.
For solving the problems of the technologies described above, technical scheme of the present invention is: the technology of hot sand waste heat recovery of a kind of mould that disappears and utilization may further comprise the steps:
(1) the hot sand flow that elementary heat recovery, lost foam casting produce is through first heat-exchanger rig, carries out heat exchange with thermodynamic medium in first heat-exchanger rig, with the heat transferred thermodynamic medium;
(2) elementary Btu utilization will be transported in the heat abstractor in corresponding work workshop by the thermodynamic medium after the hot sand heating, is used to improve the room temperature in work workshop;
(3) thermodynamic medium recycles, and the thermodynamic medium after the process heat radiation in the heat abstractor is transported in first heat-exchanger rig again recycle.
Further improvement as above-mentioned technology also comprises following step:
Secondary heat recovery and utilization will be transported to second heat-exchanger rig from the hot sand that first heat-exchanger rig is discharged, and carry out the secondary heat exchange with thermodynamic medium in second heat-exchanger rig, and the thermodynamic medium of second heat-exchanger rig is transported in the designated equipment.
Owing to adopted above-mentioned technology, in first heat-exchanger rig, carried out heat recovery through thermodynamic medium, with the heat transferred thermodynamic medium; Thermodynamic medium is transported to the corresponding work workshop to the heating of work workshop; Thereby realized recovery and utilization, used this technology to have following several benefits thermodynamic medium: from concerning the angle that energy utilizes, this process makes full use the heat that hot sand comprised; Need be through special heating equipment to work workshop heat supplies such as drying chambers; Both practiced thrift the energy, greatly reduced production cost, but also reduced pollution environment; Good effects of energy saving and emission reduction is arranged, have high economic benefit and environmental benefit; From concerning hot sand cooling angle but, to compare with traditional hot sand is cooled off through airing naturally, this technology is accelerated the cooling rate of hot sand, and it is little to take up room; With air-cooled hot sand cooling is compared, this technology does not produce dust basically, and working environment is improved; With through water spray is compared the hot sand cooling in the cylinder on cylinder, the thermodynamic medium of this technology is limited in first heat-exchanger rig and flows, and keeps the drying of working environment.
Lost foam casting is according to the difference of foundry goods, and the temperature range of the hot sand that is produced changes greatly, and common hot sand is about 200 ℃-500 ℃; Hot sand can reach 100 ℃-300 ℃ after through the first heat-exchanger rig heat exchange usually, and hot sand is at the heat that this temperature range discharged, and enough first heat-exchanger rigs are absorbed as the heat supply in all work workshops of lost foam casting; This moment, the temperature of hot sand can't directly be used for making sand mold, and again through second heat-exchanger rig, hot sand temperature can be reduced to about 50 ℃; The sand of this temperature can directly be taken away and made sand mold; Compare with the type of cooling in the past, hot sand cooling speed but accelerates, make the sand mold of isodose required etc. the quantitative change of sand to be cooled few; Shortened the life cycle of hot sand greatly; Improve the utilization rate of sand, also can correspondingly improve the production efficiency of disappearance mould, reduced the expense of buying a large amount of sands.
The present invention has also solved another technical problem; The equipment of hot sand waste heat recovery of a kind of mould that disappears and utilization is provided; The heat that the hot sand of disappearance mould is produced reclaims and utilizes; For other links in the disappearance mould production technology provide heat, practice thrift the energy of whole production technology, thereby reduce production costs.
For solving the problems of the technologies described above; Technical scheme of the present invention is: a kind of equipment of be used to disappear hot sand waste heat recovery of mould and utilization; Comprise first heat-exchanger rig that the hot sand that is used for producing with lost foam casting carries out heat exchange; Said first heat-exchanger rig is connected through thermodynamic medium with the heat abstractor in corresponding work workshop, is provided with EGR between said first heat-exchanger rig and the heat abstractor.
Owing to used the said equipment; Through the hot sand in the thermodynamic medium and first heat-exchanger rig is carried out heat exchange; With the heat transferred thermodynamic medium, heat abstractor is installed in the lost foam casting corresponding work workshop, like places such as drying chamber, spray booths; The thermodynamic medium that has absorbed heat flows into heat abstractor heat supply is carried out in the work workshop; Thereby realized recovery and utilization to hot sand heat, thermodynamic medium circulates between first heat-exchanger rig and heat abstractor through EGR, the process with heat release of constantly absorbing heat; This equipment of use has following several benefits: from the angle that energy is utilized; This equipment has made full use of the heat that hot sand comprised, and need both not practice thrift the energy through special heating equipment to work workshop heat supplies such as drying chambers; Greatly reduced production cost; But also reduced pollution to environment, and good effects of energy saving and emission reduction is arranged, have high economic benefit and environmental benefit; From concerning hot sand cooling angle but, to compare with traditional hot sand is cooled off through airing naturally, this equipment is accelerated the cooling rate of hot sand, and it is little to take up room; With air-cooled hot sand cooling is compared, this equipment does not produce dust basically, and working environment is improved; With through water spray is compared the hot sand cooling in the cylinder on cylinder, the thermodynamic medium of this equipment is limited in first heat-exchanger rig and flows, and keeps the drying of working environment.
As a kind of preferred version, said first heat-exchanger rig comprises heat collector, and said heat collector comprises support; Said support is provided with silt box, and said silt box comprises tank wall, and said tank wall forms container cavity; Said tank wall top forms sand inlet, and the below of said tank wall forms sand export, and the area of said sand export is less than the area of said sand inlet; Be provided with the heat exchanger that is assembled by some heat exchange units in the said container cavity, gapped between the said heat exchange unit, said heat exchange unit comprises feed tube and the drain pipe that is parallel to each other; One end of said feed tube is provided with the feed liquor connecting portion, and the other end is connected with first tube connector, and said first tube connector is communicated with said drain pipe; One end of said drain pipe is provided with the fluid connecting portion; The other end is connected with second tube connector, and said second tube connector is communicated with said feed tube, and the inlet direction of said feed tube and the liquid outlet of said drain pipe are in the opposite direction;
Said heat abstractor comprises some interconnective said heat exchange units, and said heat abstractor connects said first heat-exchanger rig through pipeline;
Said EGR comprises the cooling bay that is connected with heat abstractor, and said cooling bay is positioned at said heat abstractor downstream, is connected with water circulating pump between the said cooling bay and first heat-exchanger rig.
Owing to adopted technique scheme, hot sand is transported to through sand inlet in the container cavity of silt box, hot sand is contacted with heat exchange unit when sand inlet moves by sand export; Thermodynamic medium heat exchange in hot sand and the heat exchange unit; Thermodynamic medium is with the heat absorption of hot sand, and the thermodynamic medium that has absorbed heat flows into heat abstractor, and heat-exchanger rig is installed in work workshops such as drying chamber, spray booth; For disappearance mould production technology provides heat; Thermodynamic medium is ceaselessly flowing between heat collector and heat abstractor under the effect of water circulating pump, and the process of absorbing heat and dispel the heat is delivered to the heat of hot sand in work workshop such as drying chamber and obtains recycling.
As a kind of improvement, also comprise second heat-exchanger rig that the hot sand that is used for discharging with first heat-exchanger rig carries out heat exchange.
Lost foam casting is according to the difference of foundry goods, and the temperature range of the hot sand that is produced changes greatly, and common hot sand is about 200 ℃-500 ℃; Hot sand can reach 100 ℃-300 ℃ after through the first heat-exchanger rig heat exchange usually, and hot sand is at the heat that this temperature range discharged, and enough first heat-exchanger rigs are absorbed as the heat supply in all work workshops of lost foam casting; This moment, the temperature of hot sand can't directly be used for making sand mold, and again through second heat-exchanger rig, hot sand temperature can be reduced to about 50 ℃; The sand of this temperature can directly be taken away and made sand mold; Compare with the type of cooling in the past, hot sand cooling speed but accelerates, make the sand mold of isodose required etc. the quantitative change of sand to be cooled few; Shortened the life cycle of hot sand greatly; Improve the utilization rate of sand, also can correspondingly improve the production efficiency of disappearance mould, reduced the expense of buying a large amount of sands.
As preferred version of the present invention, said second heat-exchanger rig comprises liquid floating heat exchanger, and said liquid floating heat exchanger comprises support; Be rotatablely equipped with the cylinder that drives by power set on the said support; One end of said cylinder is provided with sand inlet, and the other end is provided with sand export, is provided with the propulsive mechanism that sand is moved to sand export by sand inlet in the said cylinder; The below of said cylinder is equipped with cooler bin; Liquid thermodynamic medium is housed in the said cooler bin, and said cylinder bottom is soaked and is located in the said thermodynamic medium, and said cooler bin is provided with the warm hydraulic control system mechanism of control liquid level and thermodynamic medium temperature.
During use; The power set head roll rotates; Hot sand moves to sand export after getting into cylinder by sand inlet, is finally come out by sand export, and hot sand passes to the thermodynamic medium in the cooler bin with heat via cylinder wall in cylinder; Realize the rapid cooling of hot sand, adopt this structure to have following benefit:
(1) speed of hot sand cooling is fast, and radiating efficiency is high, because cylinder gyrates; Thermodynamic medium in the cooler bin is constantly flowed, can take away by the very fast heat that cylinder is come out, warm hydraulic control system mechanism makes the thermodynamic medium maintenance low temperature in the cooler bin; The heat exchange sustainable high efficiency is carried out, and the sand in the effect bottom roll of the rotation of cylinder and pushing mechanism ceaselessly moves, can be delivered to the heat of sand on the cylinder as soon as possible; Thereby accelerate the cooling rate of hot sand; Make the sand reach the temperature that to reuse as early as possible, so just reduced the amount of the dry sand that lost foam casting need have enough to meet the need, thereby practiced thrift the time; Reduce cost, and saved the space of the hot sand of airing.
(2) to rotate required power little for head roll, and energy consumption is low, because the gross weight of cylinder and sand is very big, only receives at cylinder to want the very big power of head roll rotation needs under the situation of gravity; In order to guarantee the transmission smoothly of power, normally through gear transmission power, so the load of gear is very big, damages than being easier to; And in the middle of the present invention, cylinder soaks and is located in the thermodynamic medium, and cylinder receives the buoyancy of thermodynamic medium; Buoyancy and gravity offset, and when the degree of depth of cylinder immersion thermodynamic medium acquired a certain degree, buoyancy of liquid can be offset the gravity of cylinder and sand fully; Thereby the power that the power set head roll is rotated is minimum, has reduced very big energy consumption, thereby has practiced thrift production cost; And the load that the equipment of transferring power receives is also very little, is not easy to damage long service life.
(3) working environment neat and tidy, because thermodynamic medium is positioned at cooler bin, the turnover of thermodynamic medium in cooler bin has special warm hydraulic control system device control, so thermodynamic medium can not overflow in cooler bin, can guarantee the clean and tidy of working environment.
As a kind of improvement of the present invention, an end of said cylinder is provided with air inlet, and the other end is provided with air outlet, and said air outlet is connected with induced-draught fan, and said induced-draught fan is provided with dust arrester.So just can make air get into cylinder in the air outlet air draught through induced-draught fan by air inlet; And the formation air flows in cylinder; Through become popular a part of heat of sand of air fluxion strap, accelerate the cooling rate of hot sand, through dust arrester the dust in the air stream is disposed; Thereby keep indoor air cleaning, prevent dust pollution.
As further improvement of the present invention, be provided with automatic spraying device in the said cylinder, because the temperature range of the hot sand in the entering cylinder is very big according to hot sand temperature thermotropism sand blasting water for cooling; Degree centigrade do not wait from hundreds of to thousands of degrees centigrade; When the temperature of hot sand was higher, automatic spraying device just can thermotropism sand blasting water, takes away heat greatly through direct contact of water and sand; And because the sand temperature is higher; Steam raising soon after water is fallen on the sand, water vapour is discharged from air outlet under the effect of induced-draught fan simultaneously, can sand not got wet to influence and use.
As a kind of preferred version, said automatic spraying device comprises the atomizing spray head of at least 1 thermotropism sand blasting water, and said atomizing spray head connects the water source; Also comprise first temperature detect switch (TDS) of opening or closing said atomizing spray head according to the temperature of the hot sand in sand inlet place, the temperature sensor of said first temperature detect switch (TDS) is positioned at the sand inlet place of said cylinder, when the temperature at sand inlet place is higher; Temperature sensor sends signal to first temperature detect switch (TDS), and first temperature detect switch (TDS) is opened, and the atomizing spray head begins water spray; Be hot sand cooling, when the temperature of the hot sand in sand inlet place is hanged down, in the time of need not using water spray to lower the temperature for hot sand; First temperature detect switch (TDS) cuts out the atomizing spray head; Realize the automatic control of spray, saved manpower, reduce working strength of workers.
As a kind of preferred version; Said temperature hydraulic control system mechanism comprises cooler bin inlet and the cooler bin liquid outlet that is installed on the said cooler bin, and said cooler bin inlet is provided with second temperature detect switch (TDS) of opening or closing said cooler bin inlet according to the temperature of thermodynamic medium, when liquid level rises when surpassing cooler bin liquid outlet position; Thermodynamic medium is discharged to assigned address through the cooler bin liquid outlet; When the temperature of thermodynamic medium surpasses predetermined temperature, during the speed of influence and cylinder heat exchange, through the lower thermodynamic medium of second temperature detect switch (TDS) delivery temperature in cooler bin; Character decision by liquid; The higher liquid quality of temperature gentlier can be above the lower liquid of temperature, and therefore when the lower thermodynamic medium of temperature flowed into, the higher liquid of temperature was discharged through the cooler bin liquid outlet.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the workflow diagram of present device;
Fig. 2 is the structural representation of heat collector of the present invention;
Fig. 3 is the structural representation of heat exchange unit of the present invention;
Fig. 4 is the left view of Fig. 3;
Fig. 5 is the structural representation of liquid floating heat exchanger of the present invention;
Fig. 6 is the schematic diagram of the automatic spraying device of liquid floating heat exchanger of the present invention;
Among the figure: 1, heat exchange unit; 11, feed tube; 111, the feed liquor connecting portion; 12, the first tube connectors; 13, the second tube connectors; 14, drain pipe; 141, the fluid connecting portion; 15, elbow bend; 2, support; 21, tank wall; 22, input duct; 23, the fluid pipeline; 31, advance sand launder; 32, air inlet; 33, the cooler bin inlet; 34, cooler bin; 35, motor; 36, support; 37, housing; 38, guide rail; 39, driven friction pulley; 40, cylinder; 41, air outlet; 42, go out sand launder.
The specific embodiment
Embodiment one:
The technology of hot sand waste heat recovery of disappearance mould and utilization may further comprise the steps:
(1) the hot sand flow that elementary heat recovery, lost foam casting produce is through first heat-exchanger rig, carries out heat exchange with thermodynamic medium in first heat-exchanger rig, with the heat transferred thermodynamic medium;
(2) elementary Btu utilization; To be transported in the heat abstractor in corresponding work workshop by the thermodynamic medium after the hot sand heating; Be used to improve the room temperature in work workshop; Said work workshop comprises black mould drying chamber, white mould drying chamber, spray booth, pattern shop etc., and said thermodynamic medium can also be transported to the bathroom and use;
(3) thermodynamic medium recycles, and the thermodynamic medium after the process heat radiation in the heat abstractor is transported in first heat-exchanger rig again recycle, and adopts water circulating pump to realize the circulation of thermodynamic medium usually.
(4) secondary heat recovery and utilization; To be transported to second heat-exchanger rig from the hot sand that first heat-exchanger rig is discharged; Carry out heat exchange with the thermodynamic medium in second heat-exchanger rig, the thermodynamic medium of second heat-exchanger rig is transported in the designated equipment, be transported in the bathroom usually or as domestic water; Also can thermodynamic medium be transported in the cooling bay and cool off, reuse again after the cooling.
Embodiment two:
The equipment of hot sand waste heat recovery of disappearance mould and utilization; Comprise first heat-exchanger rig that the hot sand that is used for producing with lost foam casting carries out heat exchange; Said first heat-exchanger rig is connected through thermodynamic medium with the heat abstractor in corresponding work workshop; Be provided with EGR between said first heat-exchanger rig and the heat abstractor, also comprise second heat-exchanger rig that the hot sand that is used for discharging with first heat-exchanger rig carries out heat exchange.
Said first heat-exchanger rig comprises heat collector, and is as shown in Figure 2, and said heat collector comprises support 2; Said support 2 is provided with silt box, and said silt box comprises tank wall 21, and said tank wall 21 forms container cavity; Said tank wall 21 tops form sand inlet, and the below of said tank wall 21 forms sand export, and the area of said sand export is less than the area of said sand inlet; Said container cavity is an infundibulate, is provided with the heat exchanger that is assembled by some heat exchange units 1 in the said container cavity, and is gapped between the said heat exchange unit 1; According to the size of the amount of handling hot sand, the gap between the quantity of said heat exchange unit 1 and the heat exchange unit 1 can reasonably be adjusted, like Fig. 3 and shown in Figure 4; Said heat exchange unit 1 comprises the feed tube 11 and drain pipe 14 that is parallel to each other, and an end of said feed tube 11 is provided with feed liquor connecting portion 111, and the other end is connected with first tube connector 12; Said first tube connector 12 is communicated with said drain pipe 14; One end of said drain pipe 14 is provided with fluid connecting portion 141, and the other end is connected with second tube connector 13, and said second tube connector 13 is communicated with said feed tube 11; The inlet direction of said feed tube 11 and the liquid outlet of said drain pipe 14 are in the opposite direction, and said heat exchanger is provided with the input duct 22 that is used for the thermodynamic medium entering and is used for the fluid pipeline 23 that thermodynamic medium flows out;
Said heat abstractor comprises some interconnective said heat exchange units, and said heat abstractor connects said heat collector through pipeline, and said heat abstractor is installed in the work workshops such as black mould drying chamber, white mould drying chamber, spray booth and pattern shop; Said heat exchange unit 1 can adopt following mode to install in drying chamber, and whole heat exchange unit 1 placement parallel to the ground couples together some heat exchange units 1 and forms a row; All heat exchange units 1 are positioned at same plane; Be connected with the higher thermodynamic medium of temperature in the heat exchange unit 1, heat for drying chamber, the model of having brushed fireproof coating is placed on the heat exchange unit 1; Both make things convenient for carrying, also made things convenient for the oven dry of model;
Said EGR comprises the water circulating pump that connects between the heat abstractor and first heat-exchanger rig.
Said second heat-exchanger rig comprises liquid floating heat exchanger, and is as shown in Figure 5, and said liquid floating heat exchanger comprises support 36; Be rotatablely equipped with the cylinder 40 that is driven by power set on the said support 36, said cylinder 40 is horizontally disposed with, and said power set comprise the active friction wheel that is connected with motor 35; Said cylinder 40 is provided with and the said active friction wheel driven friction pulley 39 together that leans, and said driven friction pulley 39 is provided with two, is equipped with protruding ring-shaped guide rail 38 on each driven friction pulley 39; Said ring-shaped guide rail 38 restriction cylinder 40 positions in the axial direction prevent that cylinder 40 is movable in the axial direction, and the outside of said active friction wheel is coated with housing 37; One end of said cylinder 40 is provided with sand inlet, and said sand inlet is connected with into sand launder 31, and the other end of said cylinder 40 is provided with sand export; Said sand export is connected with out sand launder 42, is provided with the propulsive mechanism that sand is moved to sand export by sand inlet in the said cylinder 40, and said pushing mechanism comprises the helical blade that is installed in the said cylinder 40; The below of said cylinder 40 is equipped with cooler bin 34; Liquid thermodynamic medium is housed in the said cooler bin 34, and said cylinder 40 bottoms are soaked and are located in the said thermodynamic medium, and said thermodynamic medium is preferably water; Because specific heat of water holds and density is all bigger; The bigger buoyancy heat more with absorption can be provided, and draw materials conveniently, not pollute; Said cooler bin 34 is provided with the warm hydraulic control system mechanism of control liquid level and thermodynamic medium temperature; Said temperature hydraulic control system mechanism comprises the cooler bin inlet 33 and cooler bin liquid outlet that is installed on the said cooler bin 34; Said cooler bin inlet 33 is provided with second temperature detect switch (TDS) of opening or closing said cooler bin inlet 33 according to the temperature of thermodynamic medium; The temperature sensor of said second temperature detect switch (TDS) is positioned at cooler bin 34 thermodynamic mediums, and is used for the temperature of perception top liquid in the superposed liquid, and an end of said cylinder 40 is provided with air inlet 32; The other end is provided with air outlet 41; Said air outlet 41 is connected with induced-draught fan, and said induced-draught fan is provided with dust arrester, is provided with the automatic spraying device according to hot sand temperature thermotropism sand blasting water for cooling in the said cylinder 40; Said automatic spraying device comprises the atomizing spray head of at least 1 thermotropism sand blasting water; Said atomizing spray head connects the water source, also comprises first temperature detect switch (TDS) of opening or closing said atomizing spray head according to the temperature of the hot sand in sand inlet place, and the temperature sensor of said first temperature detect switch (TDS) is positioned at the sand inlet place of said cylinder 40; Automatic spraying device as shown in Figure 6 has A1, A2 and three first temperature detect switch (TDS)s of A3; Difference corresponding B1, B2 and three atomizing spray heads of B3, atomizing spray head directly supply water in cooler bin 34 through water pump, and the critical-temperature that A1, A2 and A3 can set water spray respectively is 100 ℃, 200 ℃ and 300 ℃.
The workflow of as shown in Figure 1 equipment is:
The hot sand that (1) will from sand mold, produce is transported in the heat collector, and about 200 ℃-500 ℃, hot sand is transported in the container cavity of silt box by the sand inlet of silt box the temperature of hot sand usually at this moment; Thermodynamic medium feeds in the heat exchanger through input duct 22, and hot sand flows to sand export under the gravity effect, and hot sand flow is when heat exchange unit 1; Carry out heat exchange with the thermodynamic medium in the heat exchange unit 1, thermodynamic medium is selected water usually for use, and thermodynamic medium siphons away hot sand heat; And through fluid pipeline 23 thermodynamic medium is transported in the heat abstractor, heat abstractor is work workshop heat supplies such as black mould drying chamber, white mould drying chamber, spray booth and pattern shop, the water in the heat collector can also be transported to the bathroom and use; Through the effect of circulating pump, thermodynamic medium can circulate between heat abstractor and heat collector, the recycling that hot sand heat is continued; Can guarantee the temperature constant in work workshops such as drying chamber thus; Make the present invention have following several benefits: at first, can special firing equipment be set for workshops such as drying chambers, the required construction cost of these equipment is higher; And manufacturing cost of the present invention is lower, therefore greatly reduces the cost of building firing equipment; Secondly the heat of the existing hot sand of heat collector use heats, and need not adopt extra heating energy source, has reduced the cost of buying the energy; Both practiced thrift the energy, reduced environmental pollution again, played a role in energy saving; Therefore the present invention greatly reduces the production cost of whole lost foam casting process, and uses this heat collector that hot sand is lowered the temperature rapidly, and shortened the cool time of hot sand; Can reuse as soon as possible, thereby improve the utilization rate of sand
When (2) hot sand flowed out in heat collector, temperature was greatly about 100 ℃-300 ℃, for hot sand is further cooled off; The heat collector of below above-mentioned heat collector, connecting again; Hot sand exports out the heat collector that the back directly gets into downstream from the heat collector at the upper reaches, further cools off, through the cooling of this step; The temperature of hot sand is usually located at 100 ℃-200 ℃; Thermodynamic medium in the heat collector of downstream is transported to through the fluid pipeline in the cooler bin of liquid floating heat exchanger, use as further cooling, and the hot sand that comes out in the heat collector of downstream is carried to liquid floating heat exchanger through equipment such as elevators;
(3) hot sand is transported in the cylinder 40 via sand inlet through advancing sand launder 31, and cylinder 40 rotates under the effect of motor 35, and to the motion of sand export direction, cylinder 40 is with the hydrothermal exchange in the cooler bin 34 of below under the effect of helical blade for sand; Water ceaselessly flows under the rotation of cylinder 40 drives, and has accelerated heat transfer process, and hot sand is lowered the temperature rapidly, and cooled sand flows out in cylinder 40 through sand export; Be transported to the appointed place by going out sand launder 42, induced-draught fan starts simultaneously, and air constantly flows to air outlet 41 through air inlet 32, and air flows through hot sand takes away great amount of heat; Accelerated but speed of hot sand cooling, dust also gets into induced-draught fan through air outlet 41 simultaneously, and removes through dust arrester, prevents the pollution of air; Working environment is clean and tidy in the assurance, and when the temperature of the hot sand at sand inlet place surpassed 100 ℃, first temperature detect switch (TDS) A1 control atomizing spray head B1 opened thermotropism sand blasting water for cooling; Accelerate the cooling velocity of hot sand, when the temperature of the hot sand at sand inlet place surpassed 200 ℃, first temperature detect switch (TDS) A2 control atomizing spray head B2 opened; Thermotropism sand blasting water for cooling, thus injection flow rate strengthened, accelerate the cooling rate of hot sand; When the temperature of the hot sand at sand inlet place surpassed 300 ℃, then first temperature detect switch (TDS) A3 control atomizing spray head B 3 opened thermotropism sand blasting water for cooling; Atomizing spray head B1, B2 and B 3 work simultaneously at this moment, make hot sand drop to low temperature by high temperature rapidly, accelerate the cooling velocity of hot sand; Water runs into the water vapour of hot sand generation discharges through air outlet 41, and the hot sand after will lowering the temperature after can not condensing is got wet, and influence is used; Can the temperature of a large amount of hot sand be reduced to rapidly about 50 ℃ through this step, the sand of this temperature can directly be taken away and made sand mold, compares with the type of cooling in the past; Hot sand cooling speed but accelerates, make the sand mold of isodose required etc. the quantitative change of sand to be cooled few, shortened the life cycle of hot sand greatly; Improve the utilization rate of sand, also can correspondingly improve the production efficiency of disappearance mould, reduced the expense of buying a large amount of sands; The hot water of the discharge in the cooler bin can be transported to the bathroom and use, and also can be transported in the cooling bay, after supercooling, recycles again.
Claims (10)
1. the technology of hot sand waste heat recovery of disappearance mould and utilization may further comprise the steps:
(1) the hot sand flow that elementary heat recovery, lost foam casting produce is through first heat-exchanger rig, carries out heat exchange with thermodynamic medium in first heat-exchanger rig, with the heat transferred thermodynamic medium;
(2) elementary Btu utilization will be transported in the heat abstractor in corresponding work workshop by the thermodynamic medium after the hot sand heating, is used to improve the room temperature in work workshop;
(3) thermodynamic medium recycles, and the thermodynamic medium after the process heat radiation in the heat abstractor is transported in first heat-exchanger rig again recycle.
2. the technology of hot sand waste heat recovery of disappearance mould as claimed in claim 1 and utilization also comprises following step:
Secondary heat recovery and utilization will be transported to second heat-exchanger rig from the hot sand that first heat-exchanger rig is discharged, and carry out heat exchange with thermodynamic medium in second heat-exchanger rig, and the thermodynamic medium of second heat-exchanger rig is transported in the designated equipment.
3. the equipment of hot sand waste heat recovery of disappearance mould and utilization; It is characterized in that: comprise first heat-exchanger rig that the hot sand that is used for producing with lost foam casting carries out heat exchange; Said first heat-exchanger rig is connected through thermodynamic medium with the heat abstractor in corresponding work workshop, is provided with EGR between said first heat-exchanger rig and the heat abstractor.
4. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 3 and utilization is characterized in that: said first heat-exchanger rig comprises heat collector, and said heat collector comprises support; Said support is provided with silt box, and said silt box comprises tank wall, and said tank wall forms container cavity; Said tank wall top forms sand inlet, and the below of said tank wall forms sand export, and the area of said sand export is less than the area of said sand inlet; Be provided with the heat exchanger that is assembled by some heat exchange units in the said container cavity, gapped between the said heat exchange unit, said heat exchange unit comprises feed tube and the drain pipe that is parallel to each other; One end of said feed tube is provided with the feed liquor connecting portion, and the other end is connected with first tube connector, and said first tube connector is communicated with said drain pipe; One end of said drain pipe is provided with the fluid connecting portion; The other end is connected with second tube connector, and said second tube connector is communicated with said feed tube, and the inlet direction of said feed tube and the liquid outlet of said drain pipe are in the opposite direction;
Said heat abstractor comprises some interconnective said heat exchange units, and said heat abstractor connects said first heat-exchanger rig through pipeline;
Said EGR comprises the water circulating pump that connects between the heat abstractor and first heat-exchanger rig.
5. like the equipment of claim 3 or hot sand waste heat recovery of 4 described disappearance moulds and utilization, it is characterized in that: also comprise second heat-exchanger rig that the hot sand that is used for discharging with first heat-exchanger rig carries out heat exchange.
6. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 5 and utilization is characterized in that: said second heat-exchanger rig comprises liquid floating heat exchanger, and said liquid floating heat exchanger comprises support; Be rotatablely equipped with the cylinder that drives by power set on the said support; One end of said cylinder is provided with sand inlet, and the other end is provided with sand export, is provided with the propulsive mechanism that sand is moved to sand export by sand inlet in the said cylinder; The below of said cylinder is equipped with cooler bin; Liquid thermodynamic medium is housed in the said cooler bin, and said cylinder bottom is soaked and is located in the said thermodynamic medium, and said cooler bin is provided with the warm hydraulic control system mechanism of control liquid level and thermodynamic medium temperature.
7. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 6 and utilization is characterized in that: an end of said cylinder is provided with air inlet, and the other end is provided with air outlet, and said air outlet is connected with induced-draught fan, and said induced-draught fan is provided with dust arrester.
8. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 6 and utilization is characterized in that: be provided with the automatic spraying device according to hot sand temperature thermotropism sand blasting water for cooling in the said cylinder.
9. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 8 and utilization; It is characterized in that: said automatic spraying device comprises the atomizing spray head of at least one thermotropism sand blasting water; Said atomizing spray head connects the water source; Also comprise first temperature detect switch (TDS) of opening or closing said atomizing spray head according to the temperature of the hot sand in sand inlet place, the temperature sensor of said first temperature detect switch (TDS) is positioned at the sand inlet place of said cylinder.
10. the equipment of hot sand waste heat recovery of disappearance mould as claimed in claim 6 and utilization; It is characterized in that: said temperature hydraulic control system mechanism comprises cooler bin inlet and the cooler bin liquid outlet that is installed on the said cooler bin, and said cooler bin inlet is provided with second temperature detect switch (TDS) of opening or closing said cooler bin inlet according to the temperature of thermodynamic medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101899326A CN102688987A (en) | 2012-06-09 | 2012-06-09 | Technology and equipment for recovering and reusing hot sand waste heat from lost foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101899326A CN102688987A (en) | 2012-06-09 | 2012-06-09 | Technology and equipment for recovering and reusing hot sand waste heat from lost foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102688987A true CN102688987A (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101899326A Pending CN102688987A (en) | 2012-06-09 | 2012-06-09 | Technology and equipment for recovering and reusing hot sand waste heat from lost foam |
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| Country | Link |
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| CN (1) | CN102688987A (en) |
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| CN104534890A (en) * | 2014-12-22 | 2015-04-22 | 淄博泉河工贸有限公司 | Method for using waste heat of evanescent mode founding |
| CN107511452A (en) * | 2017-09-30 | 2017-12-26 | 山西好利阀机械制造有限公司 | A kind of waste heat recycling type knockout case |
| CN112191477A (en) * | 2020-08-31 | 2021-01-08 | 同济大学 | System for inhibiting flue gas overflow at outlet of drying chamber |
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Application publication date: 20120926 |