CN101337134B - Recovery method and device of enamelling technique tail-gas - Google Patents
Recovery method and device of enamelling technique tail-gas Download PDFInfo
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- CN101337134B CN101337134B CN2008100540752A CN200810054075A CN101337134B CN 101337134 B CN101337134 B CN 101337134B CN 2008100540752 A CN2008100540752 A CN 2008100540752A CN 200810054075 A CN200810054075 A CN 200810054075A CN 101337134 B CN101337134 B CN 101337134B
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Abstract
The present invention discloses an end gas reclaiming method for a lacquering process including the steps of: A. lacquer liquid being heated; B: organic solvent being heated to volatilizate; C: end gas of lacquer coating process being cooled, condensated, separated and reclaimed. Advantages of this invention are as follows: the organic solvent steam and high temperature air are reclaimed separately from the catalyzed and burnt solvent which is still in use today in lacquer-coating industry by the method of cooling, condensation and separation. The reclaimed liquid turns into reusable organic solvent after a rectifying process while the reclaimed sub-high temperature air is sent back into the hearth to supplement the required energy for heating the lacquer liquid. In the circumferential surface of the inner hearth of the lacquering oven, a plurality of air outlets are arranged in the organic solvent volatilization section,which makes the solvent steam be discharged in time and prevents the black smoke from being formed due to the metamorphism of solvent steam under overheated condition. Compared with the end gas of lacquering process reclaimed by traditional electrothermal and catalysis-burning process, the end gas reclaimed by the process of cooling, condensation and separation has advantages of innocuity, no-exhaust, energy saving, consume reducing and efficiency increasing.
Description
Technical field
The present invention relates to a kind of recovery method of industrial waste gas; Particularly relate to a kind of in Production of Enamel Wires the separation and recovery method and the separating and reclaiming device of process tail gas.
Background technology
Enamel-cover roasting oven is a special equipment of producing enamel-covered wire.Enamel-covered wire is made up of electric conductor and insulation paint film, is used to turn to coil usually, carries out conversion each other between electromagnetism, is widely used in various electronics, the electric equipment products.
The technological process of production of existing enamel-covered wire is: conductor unwrapping wire → annealing → japanning → heat drying → winding displacement take-up (finished product).The japanning process is that insulated paint is coated in conductive surface, and for obtaining the physical dimension paint film that insulate uniformly, insulated paint is made up of basic material of lacquer and organic solvent usually.Organic solvent accounts for the 60-90% of insulated paint gross weight, and mostly organic solvent is poisonous and hazardous cresols, phenol, xylenes or other material; In the heat drying process, lacquer is after liquid is heated, and organic solvent is volatilization gradually in succession, reach uniform temperature after, the lacquer base material generation chemical reaction in the lacquer liquid becomes solid-state high molecular polymer paint film.In process of production, require this reaction to carry out continuously, therefore need certain degree of superheat that reaction is carried out continuously apace.But the existence of the degree of superheat can make the organic polymer paint film that has generated produce a small amount of or micro-low molecular organic cracking steam.
Enamel-cover roasting oven heat drying system is called furnace system, is the core of enamel-cover roasting oven.Early stage enamel-cover roasting oven is the electrothermal enamel-cover roasting oven, and Fig. 1 is the process chart of existing electric heating enamel-cover roasting oven.As shown in Figure 1, organic vapor is not processed, its workflow is following: lacquer liquid is heated → organic vapor+high polymer paint film+organic cracking steam → black smoke; Burner hearth adopts electrically heated method, and solvent is heated back volatilization and since in the burner hearth temperature (vertical machine) go up that relative superiority or inferiority is low, low before the height of (horizontal machine) back; Organic vapor flows under the effect of hot pressing naturally; And constantly be heated, become waste gas until crossing thermal metamorphism, form black smoke; External along smoke discharging pipe discharge baker, all directly enter atmosphere.The method has not only caused the pollution of poisonous and hazardous organic vapor to atmospheric environment, but also has wasted valuable the organic solvent resource and the energy.People develop the catalytic combustion enamel-cover roasting oven on the basis of electrothermal enamel-cover roasting oven, Fig. 2 is the process chart of existing catalytic combustion type enamel-cover roasting oven; As shown in Figure 2; This catalytic combustion enamel-cover roasting oven utilizes organic vapor to contain the characteristics (for example: but cresols and xylenes are in spontaneous combustion more than 450 ℃) of a large amount of available combustions heat; Adopt catalyst to reduce reaction temperature; About 370 ℃, make solvent vapo(u)r and airborne oxygen reaction, generate the nontoxic carbon dioxide G&W that can directly discharge, and discharge a large amount of recuperable heats.The operation principle of catalytic combustion type enamel-cover roasting oven is following:
Lacquer liquid is heated the back and generates organic vapor, high polymer paint film and organic cracking steam; Wherein organic vapor produces heat, carbon dioxide and water under the effect of air and catalyst, and the heat that burning produces is sent back in the burner hearth through blower fan, with the required heat of supplementary heating lacquer liquid, reaches purpose of energy saving; Gas after the burning is discharged in the atmosphere, and when catalyst surface active was abundant, burning back gas only contains carbon dioxide and the water color is white; When catalyst surface active was insufficient, it was then insufficient to burn, and not only contains carbon dioxide and water in the gas, also has unburned organic vapor or cracking steam, and color is a grey; When the catalyst surface active wretched insufficiency or when completely losing, organic vapor or paint film cracking steam content obviously rise in the gas of burning back, gas color even show as black.Catalytic combustion technology makes the combustion heat of solvent obtain the part utilization; When both having practiced thrift the energy; Also alleviated air pollution degree, but this type of enamel-cover roasting oven also has a shortcoming, the high temperature that catalytic combustion produces has also produced side effect to technical process; Make the overheated generation cracking of high polymer paint film steam, and cracking steam is intractable at this type of machine.Though cracking steam seldom, and accumulation in time, after 1 year even the some months; Cracking steam is just attached on the catalyst surface; Catalyst is lost activity, and Catalytic Combustion Effect descends, and the tail gas that enters atmosphere can become ash gradually by white cigarette and become " black smoke " at last; Thereby polluted environment, the utilization of organic solvent is also insufficient simultaneously.The catalytic reaction temperature of this type of enamel-cover roasting oven is lower, and catalyst can only be to burning solvent vapo(u)r generation effect, and just powerless to burning cracking steam.All there is this problem in present homemade catalytic combustion enamel-cover roasting oven majority.
To the problem that the catalytic combustion enamel-cover roasting oven exists, advanced in the world method is to adopt to improve the catalytic combustion temperature even reach 720-750 ℃ method, make solvent vapo(u)r with completing combustion before catalyst contacts; Alleviated the burden of catalyst; Catalyst is worked when catalytic combustion cracking steam, organic steam completing combustion, thus solved environmental pollution problems; Also improved simultaneously production efficiency; But superhigh temperature (more than 800 ℃) not only makes this equipment be difficult to catapepsis, has to cool off with air at room temperature, at last with the high-temperature gas more than 400 ℃ to airborne release.So not only consume valuable film forming matter but also increased the discharging of greenhouse gases; Also wasted simultaneously the energy; Reduced efficiency of energy utilization, the cost of equipment is increased substantially, every enamel-cover roasting oven price is up to more than 1,000,000 dollars; The production cost of making enamel-covered wire is increased, therefore limited promoting the use of of this kind equipment.
In sum, enamel-cover roasting oven all adopts catalytic combustion technology at present; Though this technology part has solved the problem of environmental pollution that enamel-cover tail gas causes, it is partially recycled that the combustion heat of organic vapor has been obtained, and practiced thrift the energy, but still had the problem of greenhouse gases CO2 emission; The high temperature that the back of organic vapor burning simultaneously produces, this equipment itself is difficult to catapepsis, has to reduce energy recovery efficient to the airborne release high-temperature gas; With the substitute of organic solvent, also lose more than gain simultaneously as the energy.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and providing a kind of is not through burn processing tail gas, but enamelling technique tail-gas is carried out the method for cooling condensation Separation and Recovery.
The technical scheme that the present invention adopted is: a kind of recovery method of enamelling technique tail-gas may further comprise the steps:
A. after conductor is coated lacquer liquid, be pulled the entering burner hearth, coat with lacquer liquid in air gets into burner hearth, and be heated the stage;
B. in the enamel-cover burner hearth, after solvent was heated volatilization and finishes, lacquer liquid continued to be heated, and when chemical reaction was temperature required, the lacquer base material in the lacquer liquid generated the solid-state organic polymer paint film material stage:
C. all the basic material complete reaction of lacquer finishes, and through of short duration insulation, paint film is moved out of burner hearth with conductor, gets into the room temperature space, carries out cooling stage;
D. through repeatedly circulation, paint film is issued to the physical dimension of process stipulation in the condition of the basic material of lacquer chemistry sufficient reacting, and the enamel-cover process finishes, and becomes the finished product stage through the winding displacement take-up;
Comprise the cooling condensation Separation and Recovery stage to enamelling technique tail-gas between stage in said heating period and generation organic polymer paint film, the said Separation and Recovery stage may further comprise the steps:
E. work as lacquer liquid in air gets into burner hearth, and be heated, when temperature of paint liquid reached A kind solvent boiling range scope, A kind solvent began volatilization and becomes the solvent vapo(u)r stage;
F. in the enamel-cover burner hearth; By blower fan with A kind solvent vapo(u)r and high temperature air together through draw the air port, A kind solvent is drawn the air channel; The organic vapor A that in time will just evaporate injects A kind solvent cooler condenser continuously; Organic vapor separates in cooler condenser with high temperature air, and organic vapor liquefaction becomes recovery liquid, shifts out cooler condenser by the leakage fluid dram of cooler condenser; The forced convertion air still has higher temperature this moment, under the effect of fan pressure, is discharged by the exhaust outlet of this cooler condenser, is sent back to the inner stage of import of burner hearth through time high temperature air return airway, return air inlet;
G. the continuation with temperature in the enamel-cover roasting oven raises; When temperature of paint liquid reaches B kind solvent boiling range scope; B kind solvent begins volatilization, the same solvent vapo(u)r with the F step and high temperature air together through the B kind draw the air port, B kind solvent is drawn the air channel, the cooler condenser that will in time send into B kind solvent by blower fan is behind condensation liquefaction; Discharge the liquid collecting container of packing into by leakage fluid dram; High temperature air by the cooler condenser exhaust outlet is discharged is sent the inner stage of burner hearth back to along time high temperature air return airway, inferior high temperature air return air inlet;
H. the X kind organic vapor that boiling range is the highest volatilizees at last; The same with the F step by blower fan with X kind solvent vapo(u)r and high temperature air together through the X kind draw the air port, X kind solvent is drawn the air channel; In time inject X kind solvent cooler condenser continuously, organic vapor separates in cooler condenser with high temperature air, the organic vapor condensing and recycling; The high temperature air that this cooler condenser exhaust outlet is discharged; Deliver to the inside of furnace outlet through return airway, return air inlet, a part of gas is along the reverse flow of enamel-covered wire traffic direction, and another part gas is used to seal the furnace outlet stage.
A kind of retracting device that is used to reclaim the described enamelling technique tail-gas of claim 1 comprises baker skeleton, burner hearth, draws the air port, draws the air channel, return airway, return air inlet and blower fan; It is characterized in that: said retracting device also includes cooler condenser; The surrounded surface of said burner hearth is provided with a plurality of said air port, a plurality of said return air inlets of drawing, and the said air port of drawing is communicated with blower fan, cooler condenser, return airway, return air inlet through drawing the air channel successively, constitutes the loop with burner hearth; The said blower fan of Frequency Converter Control injects the organic vapor in the burner hearth cooler condenser of said organic solvent continuously.
Retracting device also includes the transition cooler condenser, and said transition cooler condenser is arranged between the cooler condenser of two kinds of approaching organic solvents of boiling range.
Said cooler condenser that quantity is set is identical with the kind of organic solvent.
The quantity that is provided with of said cooler condenser should be more than the kind of organic solvent.
Said size of drawing the air port according to organic solvent volatile quantity in the lacquer liquid is respectively arranged with the opening that many groups vary in size, do not wait at interval.
Said cooler condenser is respectively equipped with one or more exhaust outlets and leakage fluid dram; Said exhaust outlet is interconnected through the inside of the import or export of return airway and burner hearth, and the inferior high temperature air that exhaust outlet is discharged from cooler condenser is sent burner hearth inside back to along return airway; Condensed organic solvent liquid enters liquid collecting container through the leakage fluid dram of cooler condenser, and said liquid collecting container is connected with rectifying column.
The invention has the beneficial effects as follows: the organic solvent that the catalytic combustion that the enamel-cover industry is used till today falls; The method of separating through cooling condensation reclaims organic vapor and high temperature air respectively; Recovery of Organic Solvent liquid becomes again available organic solvent again after rectification process, the inferior high temperature air of recovery is sent back to burner hearth with the required energy of supplementary heating lacquer liquid.Simultaneously, at the surrounded surface of enamel-cover roasting oven internal furnace, the volatilization section of organic solvent is provided with a plurality of air ports of drawing, and solvent vapo(u)r can in time be discharged, and prevents that solvent vapo(u)r from crossing the black smoke that thermal metamorphism causes and occurring; Through cooling condensation Separation and Recovery enamelling technique tail-gas, handle enamelling technique tail-gas with traditional electrothermal and catalytic combustion type and compare, have five nontoxic, as not have row, energy-conservation, consumption reduction, synergy big advantages.
Description of drawings
Fig. 1 is the process chart of existing electric heating enamel-cover roasting oven;
Fig. 2 is the process chart of existing catalytic combustion type enamel-cover roasting oven;
Fig. 3 the present invention reclaims the flow chart of enamelling technique tail-gas method;
Fig. 4 the present invention reclaims the flow chart that enamelling technique tail-gas is recycled to condenser
The flow chart of the recovery method of Fig. 5 the present invention the 1st embodiment enamelling technique tail-gas;
The retracting device of Fig. 6 enamelling technique tail-gas of the present invention---condensing enamel-cover roasting oven;
Fig. 7 is the process chart of the recovery method of the present invention's the 2nd embodiment enamelling technique tail-gas.
Among the figure:
1. the 1st high temperature air return air 2. the 1st solvent vapo(u)rs that enter the mouth are drawn the air port
3. the 1st solvent vapo(u)r is drawn air channel 4. the 2nd solvent vapo(u)r and is drawn the air port
5. burner hearth 6. baker skeletons
7. the 2nd solvent vapo(u)r is drawn the 2nd the high temperature air return air inlet in air channel 8.
9. the 2nd high temperature air return airway 10. the 2nd cooler condenser
11. the 2nd blower fan 12. the 1st blower fan
13. the 1st cooler condenser 14. the 2nd cooler condenser exhaust outlet
15. the 2nd cooler condenser leakage fluid dram 16. the 1st cooler condenser exhaust outlet
17. the 1st high temperature air return airway of the 1st cooler condenser leakage fluid dram 18.
The specific embodiment
The flow chart of the cooling condensation separation and recovery method of Fig. 3 enamelling technique tail-gas of the present invention.
As shown in Figure 3, the recovery method of enamelling technique tail-gas of the present invention may further comprise the steps: A. lacquer liquid is heated the stage; B. organic solvent is heated the volatilization stage; C. cooling condensation Separation and Recovery stage of enamelling technique tail-gas.
Embodiment 1: Fig. 4 the present invention reclaims the flow chart that enamelling technique tail-gas is recycled to condenser; The flow chart of the recovery method of Fig. 5 the present invention the 1st embodiment enamelling technique tail-gas.Like Fig. 4 and shown in Figure 5; When coating with lacquer liquid in air gets into burner hearth; And be heated; (boiling range was meant in uniform temperature interval when temperature of paint liquid reached A kind solvent boiling range scope; Certain liquid in this temperature range 90% is converted into gas) A kind solvent begins to volatilize gradually, becomes solvent vapo(u)r, and through draw air port, A solvent vapo(u)r drawn A solvent vapo(u)r the organic vapor A that air channel in time will just volatilize continuously inject A kind solvent cooler condenser (to prevent organic vapor cross thermal metamorphism reduce organic efficiency by blower fan this moment; Speed that organic vapor shifts out and flow are controlled blower fan according to this kind Recovery of Organic Solvent rate by frequency converter); Organic vapor separates in cooler condenser with high temperature air, and organic vapor liquefaction becomes recovery liquid, shifts out cooler condenser by the leakage fluid dram of cooler condenser.Reclaiming becomes pure organic solvent A (this operation also can be accomplished by other professional equipment) after liquid is removed impurity through rectifying again, as the raw material for standby or the sale of making lacquer liquid.Still has higher temperature this moment with the organic vapor forced convertion air that separates that together is cooled; Under the effect of fan pressure, discharge by the exhaust outlet of this cooler condenser; The import of being sent back to burner hearth through time high temperature air return airway, return air inlet is inner, with the import that hot blast is sealed burner hearth, prevents that cold air from getting into; And supplementary heating lacquer liquid and the required heat of free convection air, therefore have energy-saving effect.
Drawing the air port is to vary in size by many groups; The opening that does not wait is at interval formed, and form is the venetian blind type structure, sidewall around burner hearth; Size according to this position organic solvent volatile quantity determines the interval of every group of opening and the size of opening; Every group of inner opening is identical with size at interval, in case the high-temperature region is promptly in time shifted out in volatilization, gets into the efficient of cooling heat release state to guarantee to reclaim in order to organic solvent.Prevent organic vapor in the high-temperature region through the time absorb the generation that heat caused the irreversible procedure of thermal metamorphism; Reduce organic efficiency; The speed that shifts out of organic vapor is controlled blower fan according to this kind Recovery of Organic Solvent efficient by frequency converter, when organic efficiency is low, should accelerate the rotating speed of blower fan.
Continuation with temperature raises; When temperature of paint liquid reaches B kind solvent boiling range scope; B kind organic solvent begins volatilization, and the cooler condenser that will in time send into B kind solvent by blower fan with the last kind of B in like manner solvent vapo(u)r is discharged by leakage fluid dram behind condensation liquefaction; The liquid collecting container of packing into obtains pure B kind solvent through rectifying again, also can be used as the raw material of producing this kind lacquer liquid.High temperature air by the cooler condenser exhaust outlet is discharged is sent burner hearth inside back to along time high temperature air return airway, inferior high temperature air return air inlet, the required heat of supplementary heating lacquer liquid.
If the boiling range difference of A, two kinds of organic solvents of B is little or at a distance of very approaching; For the degree of depth that prevents the organic solvent B that a large amount of boiling ranges are high slightly cold excessively (otherwise the low slightly solvent orange 2 A of boiling range can not reclaim); The transition cooler condenser of AB solvent can be set, and said transition condenser is arranged between the cooler condenser of two kinds of approaching organic solvents of boiling range, makes a small amount of organic solvent B degree of depth cold excessively; With a spot of organic solvent A condensing and recycling; To improve Recovery of Organic Solvent efficient, its operation principle is identical with above-mentioned cooler condenser, not only energy savings but also make things convenient for organic solvent A and the rectification and purification of B.
Difference according to organic solvent composition in the lacquer liquid; Can be provided with a plurality of cooler condensers, the relation of the number of cooler condenser and the kind quantity of organic solvent: the number of cooler condenser equates with the kind quantity of organic solvent when no transition cooler condenser is provided with; The number of cooler condenser is greater than the kind quantity of organic solvent, to accomplish all Recovery of Organic Solvent to greatest extent when being provided with the transition cooler condenser and being provided with.
The X kind organic vapor that boiling range is the highest volatilizees at last, with in like manner last, after the organic vapor condensing and recycling, treats that rectification and purification is subsequent use.It is the highest that the high temperature air that the high temperature air that this moment, this cooler condenser exhaust outlet was discharged and other cooler condenser are discharged is compared temperature, delivers to the inside of furnace outlet through return airway, return air inlet, and high-temperature gas is shunted at this.Part gas to offset the air-flow that produces owing to hot pressing, makes organic vapor get into cooler condenser smoothly along the reverse flow of enamel-covered wire traffic direction; Another part gas is used to seal furnace outlet, prevents that aforementioned back draft from causing negative pressure to furnace outlet, and the outer air at room temperature of stove is inhaled into burner hearth inside, absorbs heat, causes energy unnecessary loss.
Treat that all organic solvents almost all after the volatilization, meet the process stipulation requirement along with temperature is increased to, the lacquer base material of lacquer in the liquid begins chemical reaction, under keeping warm mode, accomplish chemical reaction at the appointed time, generates the organic polymer paint film.At this moment, there is not the thermal source of higher temperature in the device systems internal cause, so can not produce the cracking steam of paint film, has both improved the film forming efficiency that coats with lacquer basic material, has prevented the generation of pernicious gas again.
Embodiment 2: the following wire enamel of modulating with the mixed solvent that includes 2 kinds of organic solvents compositions is an example, and its device and recovery method thereof are elaborated.
The retracting device of Fig. 6 enamelling technique tail-gas of the present invention---condensing enamel-cover roasting oven; Fig. 7 is the process chart of the recovery method of the present invention's the 2nd embodiment enamelling technique tail-gas.
Like Fig. 6 and shown in Figure 7, the existing mixed solvent of forming with typical vertical enamel-cover roasting oven, typical wire enamel industry 3 mixed cresol, xylenes is an example, and the typical structure of condensing enamel-cover roasting oven and the separation and recovery method of enamel-cover organic vapor are described.
After conductor is coated lacquer liquid, is pulled and gets into the burner hearth 5 (because the effect of air-flow has the part air and gets in the burner hearth) that is arranged in the baker skeleton 6, when lacquer liquid was heated to 135 ℃, the effusion of xylene solvent from lacquer liquid accelerated, and significantly volatilization of beginning.Burner hearth is in each temperature control district of evaporating area; Size according to lacquer liquid solvent evaporates amount; Be provided with the air port of drawing that varies in size, do not wait at interval, be beneficial to organic vapor and under the blower fan action of negative pressure, leave overheated burner hearth immediately, get into cooler condenser; (prevent organic vapor from crossing thermal metamorphism) improved organic efficiency; Because the 1st solvent vapo(u)r that spreads all over around the burner hearth is drawn air port 2; Drawing air channel 3 through the 1st solvent vapo(u)r links to each other with the 1st blower fan 12; The 1st solvent vapo(u)r is drawn and is respectively equipped with mutually perpendicular minute wind adjusting device in the air channel 3, and the negative pressure of the 1st blower fan 12 is drawn burner hearth 5 equably on demand.Xylene steam is under the 1st blower fan 12 inlet scoop action of negative pressure; Be inhaled into immediately in the 1st cooler condenser 13; Be provided with the comb of the cold water that flows in the 1st cooler condenser 13, xylene steam is emitted latent heat after meeting the cold water comb, outside the cold water comb, condenses into liquid.If sidewall in time is provided with and does not draw the air port around in the burner hearth, steam will lifting get into the high-temperature region under the effect of hot pressing, continue passive heating, and the organic molecule in causing steam is rotten, and organic vapor becomes black smoke, not only waste energy but also contaminated environment.Will adjust the flow of comb inner cold water this moment, makes most xylene steam can be in cooler condenser 13 condense into liquid under 130 ℃ the condition, and the temperature of xylenes liquid can not be low excessively; Because the xylenes liquid under the high temperature; Viscosity is very low, can either hightail the comb surface, and the leakage fluid dram 17 that gets into the 1st cooler condenser is imported into container; Pending distillation is purified, and further facilitates the condensation of follow-up solvent vapo(u)r again.
After the separated discharge of organic solvent xylenes; 130 ℃ high-temperature hot air can also be under the promotion of fan pressure; Be sent back to burner hearth import inside through the 16, the 1st high temperature air return airway 18 of the 1st cooler condenser exhaust outlet, the 1st high temperature air return air inlet 1,, make extraneous cold air be difficult to get into burner hearth in the inner local malleation that forms of burner hearth import; Increased the resistance of cold air entering burner hearth, also just reduced cold air and got into burner hearth absorbed inside heat; The hot blast that imports burner hearth simultaneously can also heat follow-up lacquer liquid, makes follow-up lacquer liquid reduce the absorption to the burner hearth thermal source, has practiced thrift the energy.The importing of the timely discharge of organic steam, high temperature air is that a good environment has been created in the effusion of organic solvent molecule in the follow-up lacquer liquid in addition, has created condition for solvent thoroughly volatilizees, and makes paint film light more, helps improving each item performance of paint film.
The difficulty of from lacquer liquid, overflowing at xylenes volatilization later stage xylenes molecule strengthens; Effusion speed slows down; Thereby need more energy, therefore when lacquer liquid is heated between 145～190 ℃, will have the xylene solvent of trace and the cresols solvent of trace to volatilize together; In the time of subsequently between 190～210 ℃, the 3 mixed cresol solvent begins remarkable volatilization.In like manner; Under the 2nd blower fan 11 inlet scoop action of negative pressure, beginning is the xylenes of trace and the mixed vapour of cresols, progressively carries out the transition to single cresols solvent vapo(u)r later on; The 2nd solvent vapo(u)r through gathering around the burner hearth is drawn air port 4; Draw air channel 7 along the 2nd solvent vapo(u)r and be admitted in the 2nd other cooler condenser 10, the 3 mixed cresol solvent vapo(u)r is reclaimed the importing container by the 2nd cooler condenser 10 through leakage fluid dram 15 in the time of 185 ℃, treat rectification and purification.At this moment about 185 ℃ high temperature air is under the effect of the 2nd blower fan 11 blast; Discharge through the 2nd cooler condenser exhaust outlet 14; Returned to furnace outlet inside through the 2nd high temperature air return airway 9, the 2nd high temperature air return air inlet 8,, and carried out branch wind in the inner formation of baker outlet malleation.The wind direction of part hot blast drives in the wrong direction along the enamel-covered wire traffic direction because in burner hearth on the temperature relative superiority or inferiority low, organic vapor can produce hot pressing under the effect of the temperature difference, low atmospherically high, makes the lifting of organic vapor nature, forms the air-flow that rises.Only if the negative pressure of blower fan inlet scoop is enough powerful, otherwise offset with it like no inverted draft, organic vapor will be difficult to get into cooler condenser, and under hot pressing function, rise to the high-temperature region, absorb heat even cause the rotten black smoke that forms.Because the inner air-flow that drives in the wrong direction with the enamel-covered wire traffic direction that exists of upper furnace outlet; Be easy to the outer air at room temperature of burner hearth is sucked in the burner hearth; Therefore the inner another part of furnace outlet reclaims air-flow, should furnace outlet be sealed, and makes air at room temperature be difficult to get into the air at room temperature preheating that burner hearth is inner or will get into burner hearth on a small quantity; To reduce the absorption of Cryogenic air, reach the purpose of energy savings to the baker energy.
After the 3 mixed cresol solvent was heated volatilization and finishes, lacquer liquid continued to be heated, when the required temperature of chemical reaction; The lacquer base material of lacquer in the liquid generates solid-state organic polymer paint film material rapidly, under the condition of isothermal almost, all coats with lacquer basic material complete reaction and finishes; Through of short duration insulation; Paint film is moved out of burner hearth with conductor, gets into the room temperature space, cools off.
Through repeatedly circulation, paint film is issued to the physical dimension of process stipulation in the condition of the basic material of lacquer chemistry sufficient reacting, and the enamel-cover process finishes, and becomes finished product through the winding displacement take-up.
In like manner, when multiple organic solvent, this device will be made accommodation, will increase draw the air port accordingly, draw the air channel, blower fan, condenser, return airway, return air inlet, to accomplish recovery to whole enamelling technique tail-gas.
Can find out from above-mentioned operation principle: whole enamelling technique tail-gas removal process; Paint removal base material is under technological temperature; Chemical reaction takes place generate outside the necessary solid organic high polymer paint film material, other process all belongs to physical change, does not have new poisonous and harmful substance to produce; Also not producing the emission greenhouse atmospheric carbon dioxide owing to burn, is that real organic vapor nontoxic, harmless, that do not have row reclaims process.
Organic solvent is in the lower boiling range scope of temperature (135～145 ℃ of commercial xylene boiling range scopes; 190～210 ℃ of industry 3 mixed cresols) 90% volatilization finishes in; Condensing and recycling under a little less than the boiling range range temperature again; The temperature difference is only between 20～40 ℃ of very narrow temperature ranges; Not only absolute temperature is low but also relative temperature difference is little, and cooling fluid (can water) temperature also can be controlled at below 50 ℃, can be used as winter heating, the thermal source of domestic water at ordinary times.Recovery liquid links to each other with rectifying column and can also reduce the thermal losses when reclaiming liquid rectifying.Discharge by original heat furnace system with tail gas; Become whole technical process and do not need initiatively to introduce fresh air; Have only the air of a small amount of free convection to get into burner hearth inside with raw material; Whole system and extraneous chance of carrying out heat exchange are significantly reduced, and the method that this and catalytic combustion type enamel-cover roasting oven are handled tail gas has formed striking contrast.Because catalytic combustion method need replenish a large amount of fresh airs; Solving the oxygen of burning needs, and only contain 21% oxygen in the air, other non-flammable compressive gas of 79% is discharged after then being heated to 400～800 ℃ of high temperature again; Strengthened the loss of heat without rhyme or reason; Compare with cooling condensation method Separation and Recovery enamel-cover solvent vapo(u)r, not only absolute temperature height but also relative temperature difference big (with respect to room temperature), and temperature high energy loss is big more more; On the other hand, when the high temperature that catalytic combustion produces exceeds technological requirement, have to cool, more strengthened heat loss with air at room temperature.It is more energy-conservation that the cooling condensation method reclaims enamelling technique tail-gas by contrast.
In insulated paint liquid, solvent accounts for 70～90% of lacquer liquid weight, and solvents a large amount of in existing enamelling technique are consumed in the enamelling technique process in vain, even change into poisonous and harmful substance.Though the combustion heat of solvent is effectively utilized by part, heat loss is very big, and organic efficiency is lower.Cooling condensation method Separation and Recovery enamel-cover organic vapor; Make solvent almost obtain complete cycling and reutilization (the solvent raw material whole circulation process after from the solvent of lacquer the liquid to rectifying; Organic solvent loss is less than 10%, and the raffinate after the rectifying still can be used as the high-grade fuel sale of steel-making, coking and bring into play its effect).Therefore, cooling condensation method Separation and Recovery enamel-cover organic vapor has guaranteed valuable organic solvent resource circulation use to greatest extent, has reduced unnecessary consumption.
Use cooling condensation method Separation and Recovery enamel-cover organic vapor, not only can produce above-mentioned nontoxic, the social benefit of not having row, energy-conservation, consumption reduction, increasing economic benefit of enterprises also is inevitable outcome of the present invention, and its income is very significant.Because mostly the solvent of wire enamel is with the oil to be the high-grade products of raw material, with constantly riseing of oil price, also when the river rises the boat goes up for the price of organic solvent.Lose more than gain especially economically as the substitute of the energy with organic solvent so.Mixed solvent with polyurethane wire enamel 3 mixed cresol/xylenes=1/1 (weight ratio) commonly used is an example; Its per kilogram solvent completing combustion, utilization in full force and effect also only are equivalent to the electric energy of 11kwh; And the electricity price of 11kwh is only about 7.7 yuan (in 0.7 yuan of the average average price of peak valley/kwh); This mixed solvent of per kilogram is worth but up to 16 yuan (by 140 dollars of/barrel calculating of international petroleum crude oil current price), moreover even organic vapor at high temperature can completing combustion also be difficult to utilize fully, in actual utilization ratio 70%; 5.4 yuan only of actual per kilogram mixed solvent recovery values; And use cooling condensation method Separation and Recovery enamel-cover organic vapor by the actual utilization ratio of per kilogram mixed solvent in 80%, add 1 yuan of the expense per kilogram that the later stage distills, nearly 12 yuan of actual per kilogram mixed solvent recovery value; Use cooling condensation method Separation and Recovery enamel-cover organic steam and compare with Production by Catalytic Combustion Process, one kilogram of mixed solvent of every recovery is just overcharged 6.4 yuan of benefits.In addition, the inferior high temperature air behind the cooling condensation is still sent back in the burner hearth, with the necessary heat of supplementary heating lacquer liquid; Enamel-covered wire per ton is energy-conservation in 200 yuan; 10,000 tons of enamel-covered wires of certain company's annual production on average consume lacquer amount 12%, insulated paint solids content 30%; Annual 840 tons of the mixed solvents that use use cooling condensation method Separation and Recovery enamel-cover organic solvent to compare with Production by Catalytic Combustion Process the pre-tax profit of creating more than 700 ten thousand yuan.
It is worthy of note that protection scope of the present invention is not limited to above-mentioned instantiation mode, for example:, be suitable for too for horizontal enamel-cover roasting oven though the technical process of the only vertical condensation enamel-cover roasting oven of the present invention is illustrated; In addition, the present invention only is illustrated the volatilization process of cresols in the organic solvent and xylenes, and in like manner this method is applicable to other organic solvents such as phenol too.According to basic fundamental design of the present invention, those of ordinary skills need not through creative work, and the embodiment that can associate all belongs to protection scope of the present invention, and protection scope of the present invention is as the criterion with the scope of its claim.
Claims (7)
1. the recovery method of an enamelling technique tail-gas may further comprise the steps:
A. after conductor is coated lacquer liquid, be pulled the entering burner hearth, coat with lacquer liquid in air gets into burner hearth, and be heated;
B. in the enamel-cover burner hearth, solvent is heated volatilization and finishes, and lacquer liquid continues to be heated; When chemical reaction is temperature required; The lacquer base material of lacquer in the liquid generates solid-state organic polymer paint film material, under the condition of isothermal almost, all coats with lacquer basic material complete reaction and finishes;
C. through of short duration insulation, paint film is moved out of burner hearth with conductor, gets into the room temperature space, cools off;
D. through repeatedly circulation, paint film is issued to the physical dimension of process stipulation in the condition of the basic material of lacquer chemistry sufficient reacting, and the enamel-cover process finishes, and becomes finished product through the winding displacement take-up;
It is characterized in that: be included in before the generation organic polymer paint film, to the cooling condensation Separation and Recovery of enamelling technique tail-gas, said cooling condensation Separation and Recovery may further comprise the steps:
E. work as lacquer liquid in air gets into burner hearth, and be heated, when temperature of paint liquid reached the 1st kind of solvent boiling range scope, the 1st kind of solvent begins volatilization became solvent vapo(u)r; Wherein, boiling range is meant in uniform temperature interval, is converted into gas at certain liquid of this temperature range 90%;
F. in burner hearth; By blower fan with the 1st kind of solvent vapo(u)r and high temperature air together through draw the air port, the 1st kind of solvent vapo(u)r drawn the air channel; The 1st kind of organic vapor that in time will just evaporate injects the 1st kind of solvent cooler condenser continuously; Organic vapor and high temperature air refrigerated separation in cooler condenser, organic vapor liquefaction become recovery liquid, shift out cooler condenser by the leakage fluid dram of cooler condenser; Still has higher temperature this moment with the 1st kind of organic vapor forced convertion air that separates that together is cooled; Under the effect of fan pressure, discharged by the exhaust outlet of this cooler condenser, the import of being sent back to burner hearth through time high temperature air return airway, return air inlet is inner;
G. the continuation with temperature in the enamel-cover roasting oven raises; When temperature of paint liquid reaches the 2nd kind of solvent boiling range scope; The 2nd kind of solvent begins volatilization, the same solvent vapo(u)r with the F step and high temperature air together through the 2nd kind draw the air port, the 2nd kind of solvent vapo(u)r drawn the air channel, the cooler condenser that will in time send into the 2nd kind of solvent by blower fan is after cooling condensation liquefies; Discharged by leakage fluid dram, the liquid collecting container of packing into obtains the 2nd kind of pure solvent through rectifying again; High temperature air by the cooler condenser exhaust outlet is discharged is sent burner hearth inside back to along time high temperature air return airway, inferior high temperature air return air inlet;
H. last a kind of organic vapor that boiling range is the highest volatilizees at last; The same with the F step by blower fan with last a kind of solvent vapo(u)r and high temperature air together through last a kind of solvent draw the air port, last a kind of solvent is drawn the air channel, in time injects last a kind of solvent cooler condenser, organic vapor and high temperature air refrigerated separation in cooler condenser continuously; After the organic vapor condensing and recycling; Treat that rectification and purification is subsequent use, the high temperature air that this cooler condenser exhaust outlet is discharged is delivered to the inside of furnace outlet through return airway, return air inlet; Part gas is along the reverse flow of enamel-covered wire traffic direction, and another part gas is used to seal furnace outlet.
2. retracting device that is used for the recovery method of the described enamelling technique tail-gas of claim 1 comprises baker skeleton (6), burner hearth (5), draws air port (2,4), draws air channel (3,7), return airway (18,9), return air inlet (1,8) and blower fan (12,11); It is characterized in that: said retracting device also includes cooler condenser (13,10); The surrounded surface of said burner hearth (5) is provided with a plurality of said air port (2,4), a plurality of said return air inlets (1,8) of drawing; The said air port (2,4) of drawing is communicated with blower fan (12,11), cooler condenser (13,10), return airway (18,9), return air inlet (1,8) through drawing air channel (3,7) successively, constitutes the loop with burner hearth (5); The said blower fan of Frequency Converter Control (12,11) injects the organic vapor in the burner hearth cooler condenser (13,10) of said organic solvent continuously.
3. retracting device according to claim 2 is characterized in that: retracting device also includes the transition cooler condenser, and said transition cooler condenser is arranged between the cooler condenser of two kinds of approaching organic solvents of boiling range.
4. retracting device according to claim 2 is characterized in that: said cooler condenser that quantity is set is identical with the kind of organic solvent.
5. retracting device according to claim 3 is characterized in that: the quantity that is provided with of said cooler condenser should be more than the kind of organic solvent.
6. retracting device according to claim 2 is characterized in that: said size of drawing air port (2,4) according to organic solvent volatile quantity in the lacquer liquid is respectively arranged with the opening that many groups vary in size, do not wait at interval.
7. retracting device according to claim 2; It is characterized in that: said cooler condenser (13,10) is respectively equipped with one or more exhaust outlets and leakage fluid dram; Said exhaust outlet (16,14) is interconnected through the inside of return airway (18,9) with the import or export of burner hearth, and the inferior high temperature air that exhaust outlet from cooler condenser (16,14) is discharged is sent burner hearth inside back to along return airway (18,9); Condensed organic solvent liquid enters liquid collecting container through the leakage fluid dram (17,15) of cooler condenser, and said liquid collecting container is connected with rectifying column.
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| CN102553414A (en) * | 2011-12-26 | 2012-07-11 | 汉中厚华电工材料有限公司 | Method for recycling volatile solvent in varnished wire production |
| CN103506007A (en) * | 2012-06-29 | 2014-01-15 | 韩富生 | Separation recovery method of enameling technique exhaust |
| CN104103382B (en) * | 2014-08-06 | 2016-03-09 | 江苏句容联合铜材有限公司 | A kind of method of lacquering of electromagnetic wire dry insulation paint |
| CN107261741A (en) * | 2017-07-11 | 2017-10-20 | 茂名市鹰鹏机电设备有限公司 | A kind of VOC recovery system and its recovery method |
| TWI732645B (en) * | 2020-08-05 | 2021-07-01 | 國立臺灣科技大學 | Separating and cooling device and fueling system using the same |
| CN113713412A (en) * | 2021-08-12 | 2021-11-30 | 珠海格力电工有限公司 | Device and method for efficiently extracting diluent in insulating paint |
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