CN101559290B - Method for drying and reclaiming organic solvent and equipment thereof - Google Patents
Method for drying and reclaiming organic solvent and equipment thereof Download PDFInfo
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- CN101559290B CN101559290B CN2009100394286A CN200910039428A CN101559290B CN 101559290 B CN101559290 B CN 101559290B CN 2009100394286 A CN2009100394286 A CN 2009100394286A CN 200910039428 A CN200910039428 A CN 200910039428A CN 101559290 B CN101559290 B CN 101559290B
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Abstract
The present invention provides a method for drying and recovering organic solvent and equipment thereof, which can be used for drying and recovering organic solvent distributed on a continuous running strip. The method comprises the following steps: 1, preparation step, in which, after making the strip or a traction object pass through a drying and recovery equipment, the inner space of the drying and recovery equipment is closed, and before starting the continuous running of the strip, protective gas is injected in the inner space of the drying recovery equipment; 2, protection step, in which, protective gas is injected in the inner space of the drying recovery equipment to exhaust mixed gases in the inner space, so that oxygen content in the gases of the inner space is lower than 16 percent (vol); 3, drying step, in which, gas which is heated or not heated is driven to blow a continuously traveling stripped; 4, recovering step, in which, the saturated concentration of the organic solvent steam is reduced, and part of the organic solvent steam exceeding the saturated concentration is condensated into liquid to be recovered. The method not only can be used for single production equipment, but also can be used for a production line mixed with a plurality of equipment in various types, and can realize the aims of energy conservation, exhaust reduction, and safety and environmental protection.
Description
[technical field]
The invention provides a kind of oven dry recovery method and equipment of organic solvent, be applicable to oven dry and reclaim the organic solvent that is distributed on the ribbon of advancing continuously, can be widely used in the equipment such as coating machine, compounding machine, printing machine, roller coating line, gluing machine, it relates to, and oven dry, gas separate, explosion-proof, heat exchange, refrigeration, technical field such as control automatically.
[background technology]
Utilization of the present invention is to liking similar process equipments such as coating machine, compounding machine, printing machine, roller coating line, gluing machine.These equipment all have following feature: 1, institute's product processed or product base material are the ribbons of advancing continuously, as plastic sheeting, metal sheet etc., generally adopt unwinding and rewinding mechanism to realize advancing continuously, and processing continuously in the process of advancing.2, institute's product processed or product substrate surface utilize the transfer device of equipment to cover one or more layers material earlier, as printing ink, coating, glue etc., and these materials need add one or more organic solvents for the purpose of dissolving, dilution, dispersion before transferring to product surface, could guarantee the quality that shifts like this.3, organic solvent is the required consumptive material of process, is not the part of final products, and therefore after the transfer covering was finished, institute's converted products must evaporate organic solvent by the drying plant of equipment.
Fig. 1 is traditional monomer-type drying plant schematic diagram, generally applies to organic solvent oven dry amount small device such as printing machine.Ribbon 00 is emitted from unreeling machine, the process transfer device is at the surface coverage desired substance, 103 enter baking oven 11 through entering the mouth, hot-air brushes the surface of the ribbon 00 of advancing continuously, force organic solvent volatilization becoming organic vapor, ribbon 00 is dried after export 104 leaves baking oven 11, and is finished process by the winder rolling.Drying plant 10 generally is made up of baking oven 11, heater 12, blower fan 13, blast pipe 14, inlet air door 15, backwind tube 16, return air air door 17, exhaust duct 18, natural air in the environment enters blast pipe 14 by air inlet 101, inlet air door 15 can change intake, air enters baking oven 11 after blower fan 13 pressurizations and heater 12 heating, brush the surface of the ribbon 00 of advancing continuously, force organic solvent volatilization becoming organic vapor to mix the back with the air that enters baking oven 11 and form waste gas, the concentration of organic vapor generally is lower than 0.3% (vol) in the waste gas.Part waste gas is discharged into the atmosphere from exhaust outlet 102 through exhaust duct 18, also has part waste gas to return baking oven by backwind tube 16, return air air door 17, blower fan 13, heater 12 after heating, thereby reduces the amount of fresh air that enters, and reduces the energy consumption that adds hot-air.Adjusting inlet air door 15 and return air air door 17 can change the flow and the mutual ratio of air intake, return air.
Fig. 2 is the box-like drying plant schematic diagram of traditional group, and drying plant is combined by a plurality of drying units (A, B, C, D, E, F) cascade, generally applies to the bigger equipment of organic solvent oven dry amount such as coating machine.The composition of each baking oven unit (adds A to operation to monomer drying plant shown in Figure 1 is similar behind each part name, as 11A etc., to show difference), the throughput of each unit and bake out temperature all can independently be adjusted, each unit combustion gas is pooled to exhaust duct 18 backs and is discharged in the atmosphere by exhaust blower 19, this type of plant waste gases amount is very big, and the discharge capacity of each unit per hour surpasses 2000 cubic metres usually, and the single device total emission volumn surpasses a per hour ten thousand stere.
There is following problem in above-mentioned drying unit: 1, organic solvent is harmful to human body and environment, and directly discharging causes polluting; 2, exist the utmost point that the organic solvent of economic worth and a large amount of heats are arranged in the waste gas, can not make a silk purse out of a sow's ear causes producing exorbitant expenditure, and processing benefit descends; 3, for reduce add hot-air energy consumption just needs reduce the flow of fresh air, but there is serious potential safety hazard in the concentration that can cause organic steam above the explosion limit accident of blasting; 4, adopt natural air in a large number, make processing be limited by climatic environment, when ambient air temperature was low, it was huge to heat required energy consumption, even can't satisfy the oven dry needs and cause stopping production; 5, the dust in the natural air influences the crudy of product.
As a kind of improvement project of above-mentioned drying unit, use active carbon or activated carbon fiber that exhaust gas discharged is carried out adsorption treatment, most organic solvent in the waste gas can be reclaimed, reduce atmosphere pollution to a certain extent, and had certain economic benefits.But also there is following problem in this improvement project: 1, for the control device cost need reduce exhaust gas flow, cause hidden peril of explosion more outstanding; 2, in waste gas treatment process, also want the huge energy of additive decrementation, operating cost is higher; 3, active carbon or activated carbon fiber are consumptive material, need periodic replacement, cause cost to rise and influence production; 4, the desorption processing procedure can produce the water pollution; Equipment complexity, bulky takies the production site of more preciousness, and makes improvement project be subjected to more restriction; 5, be helpless to promote product quality and avoid production process affected by environment.
Relevant textbook and pertinent literature propose to adopt in drying plant condensation to reclaim the scheme that cooperates the closed cycle oven dry for the purpose of energy savings, and this type of scheme has obtained practice in the equipment of oven dry moisture.Chinese patent literature CN101002991 discloses a kind of solvent reclaimer of loop circuit, the operation that the pressure fan that printing or painting device are established a calandria is dried for baking box, utilize air exhauster that heat exchanger, radiator and the condenser that the solvent that volatilizees is evacuated to reclaimer carried out three coolings again, make the solvent of volatilization carry out liquid gas and separate and be recovered in the condensation accumulator tank, and cold air promptly is sent to the pressure fan of evaporimeter, heat exchanger and calandria thereof and carries out three times and heat; Whereby, making the solvent of volatilization be able to store collected recycles in the condensation accumulator tank, and then the consumption of reduction solvent, gas with the volatilization in season can circulate and the anti-anxiety that leaks in this loop fully, pollute and air pollution with the water of avoiding the traditional printing device to be caused really, and then effectively improve environmental benefit and save the energy.But analyse in depth this patent documentation and find following problem, because organic steam can be blasted, for avoiding blast just organic vapor concentration must be controlled under the explosion limit, for control concentration just must be used bigger air circulation and lower condensation temperature, the benefit that causes condensation to be reclaimed is low, equipment cost and operating cost are all very high, make this patent documentation lack practicality.And closed cycle is all emphasized the necessary good seal of equipment, and the equipment that this patent documentation is used must allow institute's converted products walk by, cause the import and export air-tightness of institute's converted products relatively poor, especially the material of import department's product surface covering is dried as yet and is not allowed the object contact, be difficult to take seal approach completely, make closed cycle be difficult to utilization, and the problem that this patent documentation does not certainly exist at this point propose countermeasure, has the defective on the technical scheme.
Purpose for environmental protection, the discharging of a plurality of countries such as America and Europe strict restriction organic vapor, industry adopts solvent-free processing scheme such as water color ink, water paint and equipment at present with development be striving direction, but water can't compare favourably with good dissolving, the dilution capacity of organic solvent all the time, adopt water color ink, water paint product processed chromaticity relatively poor, material and equipment are all relatively more expensive, and the baking needed energy consumption is bigger.And similar process equipment such as coating machine, dry compound machine, intaglio press, metallic plate roller coating line and institute's converted products all relate to the wide traditional industries of face width, so, need find and meet recycling economy, cleaner production, to can take into account environmental protection, safe, energy-conservation, quality and economic benefit solution, ensure that industry is continued to develop healthily, this also is that the present invention expects the social responsibility born.
[summary of the invention]
Purpose of the present invention aims to provide a kind of organic solvent oven dry recovery method and equipment thereof, realize safety and environmental protection, the energy-saving and emission-reduction of process equipments such as coating machine, compounding machine, printing machine, roller coating line, gluing machine, reach and reduce the environmental pollution that waste gas causes, the recovery organic solvent is increased economic efficiency, prevent that blast from guaranteeing safe production, reduce the energy resource consumption in the production process, lifting means institute converted products quality, reduce production process and be subjected to the amblent air temperature condition influence, to overcome weak point of the prior art.
For achieving the above object; general thought of the present invention is: can't adopt relative closed cycle under the airtight fully situation at equipment; promptly under the situation of controlled limited discharging, realize recycling of most of protective gas; reduce toxic emission, for the protective gas that uses nitrogen, carbon dioxide etc. can play explosion-proof creates conditions as the oven dry protective gas as far as possible.Do not use outside natural air, make production process not be subjected to the amblent air temperature condition influence, the converted products quality also can not be subjected to the influence of dust in the air.Improve the concentration of organic vapor in the drying course after the use protective gas acquisition safety guarantee, the benefit that makes condensation method reclaim organic solvent promotes greatly.Adopt heat exchanger to reduce before the condensation gas temperature after the gas temperature and the condensation that raises, reclaim the heat of most of protective gas, further the energy consumption of reduction equipment operation.The purging effect that adds air blast is offset because of the influence of organic vapor concentration rising back to dries quantity.
According to the foregoing invention thinking, provide following summary of the invention:
1, a kind of oven dry recovery method of organic solvent is applied to dry and reclaim the organic solvent that is distributed on the ribbon of advancing continuously, and the method includes the steps of:
Preparation process: after ribbon or its traction thing passed the oven dry reclaimer; closed oven dry reclaimer inner space; before the startup ribbon is advanced continuously; inject protective gas to oven dry reclaimer inner space; order about the gas discharge that the inner space mixes, make the inner space oxygen content be lower than setting value.
Pass equipment for ease of ribbon or its traction thing that will need to process, can take to open modes of operation such as oven cover usually, can make extraneous air enter into the device interior space like this.Finish pass through or draw the closing apparatus inner space after; for ensuring safety; before advancing continuously, the startup ribbon at first discharges air with protective gas; after treating that the inner space oxygen content reaches setting value; start the abundant blender gas body of gas circulation; continue to inject protective gas; the oxygen content of guaranteeing space all sites gas all is lower than setting value; the while pre-heating device; make equipment be in good SBR; start ribbon continuously row and start vaporizer organic solvent afterwards, could not only ensure safety but also guarantee the dries quantity at initial stage.
Protection step: inject protective gas to oven dry reclaimer inner space and order about the gas that the inner space mixes and be discharged to device external; make the oxygen content of inner space gas be lower than 16% (vol); destroy the condition that organic vapor is blasted, be the organic vapor of the enrichment high concentration safety that provides safeguard.
The explosion limit scope of organic vapor is subjected to the protective gas properties influence of oxygen content and mixing, and with the minimizing of oxygen content, the upper limit of explosion limit descends rapidly, and lower limit can slightly change, and the explosion limit scope is dwindled.Arrive to a certain degree when oxygen concentration is little, the blast bound is combined into a bit, is called and loses quick-fried point, and the explosion limit scope is zero, loses the possibility of blast fully.Described protective gas is that the gas that does not react with organic solvent under normal condition with nitrogen, carbon dioxide, inert gas etc. is the mist of main component; oxygen content must be lower than and loses quick-fried concentration in the mist, guarantees and does not all possess explosion condition after the organic vapor of any ratio mixes.
The oxygen content and solvent types, the composition of mist, temperature, the pressure that lose quick-fried point all have relation; generally need be determined by experiment, be that quick-fried some oxygen concentration of mistake of protective gas is just than about oxygen concentration slightly high 3% (vol) of employing nitrogen as protective gas as adopting carbon dioxide.For organic solvent commonly used, the oxygen concentration of losing quick-fried point is lower than 16% (vol) mostly.
Baking step: order about through heating or the ribbon of not advancing continuously through the gas purging of heating, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas; Fully purge belt surfaces organic vapor is mixed into rapidly in the gas, reduce belt surfaces organic vapor dividing potential drop and accelerate evaporation rate; Using gases indirect or ribbon be the raise temperature of ribbon and gas of mode such as heating directly, and the saturated concentration of raising organic vapor is further accelerated the evaporation rate of organic solvent.With the butanone is example, and bake out temperature is in the time of 80 ℃, and the saturated concentration of butanone steam is 100%, and maximum concentration in the drying course is controlled in 3%, and cooperating fully, the purging evaporation rate can satisfy the oven dry demand.
Recycling step: will mix the gas cooled of organic vapor, and reduce the saturated concentration of organic vapor, will surpass and reclaim after saturated concentration organic vapor partly be condensed into liquid.Under the safety guarantee that the protection step provides, organic vapor concentration can be brought up to the suitable level that adopts the condensation method economic recovery.With the butanone is example, and when condensation temperature was-20 ℃, saturated concentration was 0.84%, concentration as organic vapor before the condensation is 2.84%, then condensed concentration is 0.84%, 2% the organic vapor recovery that is liquefied in the condensation process, and it is quite high to reclaim benefit.
Circulation step: order about gas and between baking step and recycling step, circulate, two independent steps that operate are organically linked together, realize oven dry evaporation---the organic solvent transfer process that condensation is reclaimed.The gas circulation utilization has reduced the demand to protective gas, has avoided process and product quality to be subjected to the humiture of ambient air outside, the influence of cleanliness factor simultaneously.
The brought forward example, behind recycling step, the gas that contains 0.84% organic vapor is got back to baking step, again concentration is risen to 2.84% in the drying course, fall back 0.84% again after entering the recycling step condensation once more, then circulation is each time all reclaimed 2% organic vapor liquefaction.
Described protection step comprises following steps:
Detect step: checkout equipment inner space gas oxygen content;
Alarming step: when the oxygen content detected value was higher than the upper safety limit value, maximum stream flow was injected protective gas to the inner space, and output alarm signal forbids that ribbon advances;
Implantation step: the oxygen content detected value is higher than when adjusting higher limit but when being lower than the upper safety limit value, starting to the inner space and inject protective gas;
Keep step: the oxygen content detected value is lower than when adjusting lower limit, stops to inject protective gas to the inner space
The upper safety limit value is the impassable warning line that ensures safety, as 8% (vol) that proposes in the summary of the invention 4;
The adjustment higher limit is the control point that changes the injection state, and its setting should consider to inject the flow of protective gas and the variation relation of oxygen content, must keep the sufficient reaction time to equipment, guarantees to start injection back oxygen content and can not break through the upper safety limit value.As be set at 5% (vol), then for the upper safety limit of 8% (vol), there is 3% variation space to exchange the reaction time for.
The consumption and the control reaction time of protective gas is mainly considered in the setting of adjusting lower limit, as sets 2 (vol);
The detection available oxygen content level sensor of oxygen content cooperates control circuit to realize, the start-stop that protective gas injects can adopt magnetic valve to cooperate control circuit to realize.
The purpose of oven dry is to impel the organic solvent that is distributed on the ribbon all to be evaporated to organic vapor to separate with ribbon, for guaranteeing dries quantity, reduce the oven dry energy consumption, accelerate the purpose of drying rate, the implementation method of summary of the invention 1 described baking step is provided, comprises following steps:
Preheating step: order about from the higher ribbon of the gas purging temperature of recycling step, to impel the organic solvent evaporation that remains on the ribbon be organic vapor and be mixed in the gas, reduces the ribbon temperature, preheating gas rising gas temperature.Ribbon has been cooled off in this step 1 aspect, makes its temperature near environment temperature, prevents that oven dry from finishing to be out of shape after the rolling, on the other hand preheating as yet not the gas of heating reclaimed heat, reduce the required energy consumption of follow-up heated air.
High-temperature step: heat and order about gas purging ribbon from preheating step, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas rising ribbon and gas temperature.This step take simultaneously to raise mode that temperature improves saturated concentration and purging reduces near the organic vapor dividing potential drop belt surfaces, accelerates organic solvent evaporation speed, guarantees that organic solvent evaporation is thorough.
Low temperature step: order about the gas purging ribbon from high-temperature step, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas, adds organic vapor concentration in the atmospheric, reduces gas temperature.This step adopts lower bake out temperature, is main means to purge, and top layer organic solvent distributed more widely is evaporated in advance, avoids surface drying on the one hand, reduces the temperature of gas on the other hand, reclaims for condensation and creates better condition.
2, using the explosion-proof and oven dry of protective gas in space that can not complete closed is key point of the present invention; if but the consumption of protective gas is crossed senior general and is lost economy and practicality; so; must under safing prerequisite, reduce the consumption of protective gas; based on above purpose; the control range of the middle oxygen content of summary of the invention 1 described protection step is narrowed down to 1% (vol) between 8% (vol), be set between upper safety limit value and the upper control limit value.
Experiment shows that employing nitrogen is protective gas, and quick-fried some oxygen content of mistake of organic vapor commonly used is about 12% (vol); The employing carbon dioxide is a protective gas, and quick-fried some oxygen content of mistake of organic vapor commonly used is about 15% (vol).Select the upper limit of 8% (vol) for guaranteeing safety as security control.Too low oxygen content means that needs consume the highly purified protective gas of big flow, from practicality, selects oxygen content 1% (vol) can take into account the purity flow of protective gas for lower control limit.Also reduce the exhaust gas discharging amount when reducing the protective gas injection rate, further promoted environment protecting.
3, in summary of the invention 1, the gas temperature and the condensation temperature temperature difference through baking step are bigger, directly condensation is very big to the demand of cold, and the gas temperature after the condensation process is lower, Jia Re energy consumption is also bigger again, so for the purpose that reduces condensation recycling step energy consumption, provide the implementation method of recycling step in the summary of the invention 1, comprise following steps:
Cooling step: will carry out heat exchange from the gas and the condensed gas of baking step, and reduce gas temperature, and reduce condensation institute chilling requirement.
Condensing steps: condensation is through the gas of heat exchange cooling, reclaims after part organic vapor in the gas is condensed into liquid being blended in.
Heating step: will carry out heat exchange through the cryogenic gas of condensation and gas from baking step, the rising gas temperature reduces the required energy consumption of heated air.
4, summary of the invention 1 described circulation step is to order about the gas flow circulation, through baking step and recycling step, two independent steps that operate is organically linked together.With regard to air-flow; the needs of baking step and recycling step are conflicting; at baking step; need air flow to purge the evaporation rate that belt surfaces is accelerated organic solvent; and at recycling step, condensation is only useful to organic vapor, and the condensation protective gas will increase invalid energy consumption; ensureing under the prerequisite of dries quantity the air-flow of the recycling step that should as far as possible reduce to flow through.For addressing the above problem, the implementation method of summary of the invention 1 described circulation step is provided, comprise following steps:
Oven dry circulation step: order about gas cycle purge ribbon in baking step, purge by gas circulation in the baking step, strengthen the throughput that purges belt surfaces, make in the abundant entrained gas of organic vapor, reduce near the organic vapor dividing potential drop of belt surfaces, quicken the evaporation of organic solvent;
Reclaim circulation step: order about gas circulation and flow to recycling step, flow back to baking step again from baking step;
After circulation step is divided into oven dry, reclaims two circulation steps and control respectively, can satisfy purging required throughput, can reduce the throughput that is recycled to recycling step again, both ensure dries quantity, reduce operation energy consumption again.
5, a kind of oven dry reclaimer of organic solvent, comprise hot-air seasoning device, condensation retracting device and gas shield device, its architectural feature is: hot-air seasoning is put into gas port and is connected to condensation retracting device gas vent, hot-air seasoning device exhaust outlet is connected to condensation retracting device gas access, the inner space of hot-air seasoning device and condensation retracting device forms gas circulation channel, and ribbon enters the ribbon access road of hot-air seasoning device as the gas channel between circulation canal and the external environment condition; Gas shield device is provided with the circulation canal inlet and links to each other with circulation canal.
Gas shield device injects protective gas and inside is mixed gas in circulation canal discharges to external environment condition by the gas channel between circulation canal and the external environment condition; ribbon passes through from the hot-air seasoning device; hot-air seasoning device heated air is also ordered about the ribbon that gas purging is advanced continuously; impelling the organic solvent evaporation that is distributed on the ribbon is in organic vapor and the entrained gas; after the gas that hot-air seasoning device exhaust outlet is discharged enters the condensation retracting device; the part organic vapor reclaims after being condensed into liquid, and the gas that has reclaimed the part organic vapor that is condensed is circulated back in the hot-air seasoning device through condensation retracting device gas vent.
The hot-air seasoning device is identical with the drying plant major part of legacy equipment, usually form by baking oven, blower fan, heater, airduct, main difference is that its air intake, air draft compile the back respectively and dock with the condensation retracting device, form the gas circulation channel of relative closure, neither use extraneous air in a large number, also not to a large amount of discharging waste gas in outside.
The condensation retracting device is the industrial circle conventional equipment, is made up of refrigeration machine, condenser, reservoir usually, and refrigeration modes, gas cooled mode all have multiple choices, and a refrigeration machine can provide cold for the condensation retracting device of a plurality of oven dry reclaimers.The present invention recommends to use and adopts vapour compression refrigerator, adopts the R410A environmental protection refrigerant, and condenser adopts finned heat exchanger to realize gas cooled, and the condensation temperature range of choice is preferably between-35 ℃-5 ℃.
Gas in the circulation canal both can utilize the blower fan in the hot-air seasoning device to promote circulation, also can increase circulating fan separately and promote.Because between circulation canal and external environment condition gas channel is arranged, its air pressure inside is generally near environment atmospheric pressure.
The core of gas shield device is a source of the gas, and a source of the gas can be a plurality of oven dry reclaimer air feed simultaneously.The caisson, carbon-dioxide generator, membrane nitrogen machine, the pressure swing adsorption method nitrogen making machine that store finished product gas all can be used as source of the gas; the pressure of protective gas is all far above atmospheric pressure in the common source of the gas; and the pressure in the circulation canal is almost identical with atmospheric pressure; so do not need other power drive, protective gas can easily overcome blast any position injection in circulation canal that blower fan produces.
Because its surface coverage material not oven dry as yet when ribbon enters the hot-air seasoning device, the surface of ribbon does not allow the object contact and causes its inlet port to be difficult to sealing, and circulation canal is communicated with external environment condition, and equipment can't be airtight fully.So adopt relative closed cycle, under the situation of controlled limited discharging, realize recycling of most of protective gas.
Can guarantee that internal gas can discharge though inject protective gas; but under the influence of circulating current; if the ribbon inlet port is too opened wide; gas exchange phenomenon in inside and outside will take place under flow perturbation, and extraneous air also can destroy safety guarantee by the inner oxygen content that improves gas in the circulation canal of access arrangement.Therefore need take measures to control the circulation of inside and outside gas, realize controlled limited discharging.So in addition perfect, described ribbon access road is a contour or not contour narrow-gap channel, the ribbon access road is along greater than the minimum slit internal height of channel interior H 6 times of the length L of ribbon direct of travel, i.e. L/H＞6.The ribbon outlet is provided with a pair of rubber rollers to realize the shutoff to gas.
Adopt the purpose of narrow-gap channel to be the windage that strengthens, avoid the influence of circulating current disturbance, make internal gas form the unidirectional external environment condition that is discharged under the driving of pressure injecting protective gas, prevent extraneous air access arrangement inside.The method that the injection control suggestion of protective gas adopts summary of the invention 1 to provide.Adopt the protective gas amount of gas flow that this mode discharges and injection roughly suitable,, can reach below 0.1% with respect to the waste gas discharge capacity of legacy equipment if other position air-tightness of equipment is good.
For avoiding the inside and outside gas communication, ribbon leaves the outlet of hot-air seasoning device need take strict airtight measure, at exit ribbon drying, the surface allows to contact with object, the measure that can take is more, as use two rubber rollers shutoff outlets to pressing, and allow ribbon to passing the rubber rollers of pressing, can adopt mode such as elastic doctor blade to realize airtight between casing to the rubber rollers of pressing and hot-air seasoning device.
Because organic vapor concentration may be more than 10 times of legacy equipment in the combustion gas, so still there is environmental pollution problems, and the waste gas that extractor fan extract to discharge need be installed near exhaust outlet discharge, or additionally increase small-sized absorbent charcoal adsorber waste gas is handled with a large amount of air dilutions back.
For eliminating exhaust emission more up hill and dale; described gas shield device the circulation canal inlet be installed in the exhaust duct; ribbon admission passage inlet communicates with described ribbon access road, and the protective gas that injects by back one inlet forms the gas curtain that intercepts the inside and outside gas communication in the ribbon access road.Protective gas as gas curtain both can flow into circulation canal, also can flow out to external environment condition.Be that described gas shield device has 2 inlets at least; one of them ribbon admission passage inlet is installed in the ribbon access road; constitute the triplate line of connection circulation canal, external environment condition and a gas shield device; ribbon admission passage inlet is made up of a plurality of micropores or a plurality of slit; be distributed in the upper and lower sides or the both sides of ribbon access road, overcome the obstruct that ribbon causes.Other inlet communicates with circulation canal, and single hole injects and gets final product.
The protective gas that ribbon admission passage inlet discharges in the ribbon access road forms gas curtain, has both stoped device external air access arrangement inside, also stops internal gas to be discharged to external environment condition.
In the preparatory stage; according to summary of the invention 1 described preparation process; open the inlet that is connected to circulation earlier and inject protective gas; making internal gas pass through the ribbon access road discharges; after treating that inner oxygen content reaches setting value; open ribbon admission passage inlet again and continue to inject protective gas with stable flow rate, the method that provides by summary of the invention 1 is controlled the injection of circulation canal protective gas simultaneously.
Under the situation of equipment gas position good seal; the exhausted major part of the protective gas that ribbon admission passage inlet is discharged flows out to external environment condition and stops air to enter; the protective gas of trace is entering circulation canal with internal gas intersection exchange; have the organic vapor of trace simultaneously in the emission gases, but concentration and absolute discharge capacity all can satisfy environmental requirement.
Because the device interior partial pressure is higher than external pressure; have partial interior gas in the actual motion probably and leak into external environment condition; just leak as the ribbon exit than being easier to; at this moment; blower fan is provided with the position should ensure that the ribbon porch is the lower place of device interior air pressure; like this; the protective gas that ribbon admission passage inlet discharges partly flows out to external environment condition and stops air to enter; the part flow into circulation canal remedy equipment leakage to the outside gas flow keep internal pressure; extraneous air does not have the passage of access arrangement inside, and additional protective gas also plays the effect that reduces the internal gas oxygen content simultaneously.
Because moving component is arranged, even take seal approach, the exit that ribbon leaves the hot-air seasoning device still is possible leakage point, extracts gas leakage if there is leakage that extractor fan should be installed really, can also cool off ribbon with extractor fan simultaneously.
The oxygen content of monitoring gas at any time is safing necessary means; it also is the foundation of control shield gas flow rate; described its part of oven dry reclaimer also comprises oxygen content sensor and air valve; the probe of oxygen sensor is installed in the oxygen content that detects gas in the circulation canal in the circulation canal; air valve is connected between gas shield device source of the gas and the inlet by tracheae, is used to control the flow that injects the circulation canal protective gas.The detection data start-stop equipment that control device can provide according to sensor, warning, adjustment shield gas flow rate etc.; control device can also can increase function for oven dry reclaimer or the independent design and installation of gas shield device in the original control appliance of equipment.
6, provide a kind of oven dry reclaimer perfect in addition on summary of the invention 5 bases, described condensation retracting device comprises parts such as heat exchanger, condenser, refrigeration machine, reservoir, heat exchanger has two-way to isolate mutually but the gas channel of heat exchange mutually, one the tunnel as the cooling passage, another road is as the intensification passage, heat exchanger cooling channel outlet links to each other with the condenser gas access, heat exchanger intensification feeder connection links to each other with the condenser gas vent, enters before the condenser and through the gas heat exchange in heat exchanger behind the condenser.Use the purpose of heat exchanger to be to retrieve waste heat, reduce the required refrigerating capacity of condensation, reduce the input and the operating cost of condensing plant, energy savings from hot blast drying unit gas.Described heat exchanger is the gas sensible heat interchanger, can make with reference to the principle and the structural design of heat pipe air heat exchanger, air conditioner fresh air machine.
7, provide a kind of oven dry reclaimer perfect in addition on summary of the invention 5 bases, described its part of condensation retracting device also comprises a circulating fan, and the condensation retracting device comprises condenser, heat exchanger, circulating fan, reservoir, refrigeration machine.The air outlet of circulating fan links to each other with heat exchanger cooling feeder connection, sends into heat exchanger after the gas pressurized in the circulating fan extraction hot-air seasoning device.Use the purpose of circulating fan to be to increase the windage that blast overcomes heat exchanger, control air circulation flexibly.For obtaining good heat exchange effect, need in heat exchanger, form turbulent flow, cause windage bigger, need guarantee the flow of gas with higher blast.
8, a kind of oven dry reclaimer perfect in addition on summary of the invention 5 bases is provided, described hot-air seasoning device comprises baking oven at least, exhaust duct, blast pipe, backwind tube, blower fan and heater, the exhaust outlet of baking oven is connected to condensation retracting device gas access by exhaust duct, condensation retracting device gas vent is connected to the air inlet of blower fan by blast pipe, backwind tube is connected between exhaust duct and the blast pipe, the exhaust outlet of blower fan directly or be connected to the air inlet of heater by airduct, the air outlet of heater directly or by airduct is connected to the air inlet of baking oven, exhaust duct, blast pipe, backwind tube contains air door or does not contain air door.The technical program tradition simple in structure is highly suitable for adopting the equipment of small-sized drying plant, as printing machine.
Gas loops back baking oven from the baking oven exhaust outlet through exhaust duct, backwind tube, blast pipe, after blower fan pressurization, the heater heating and purges ribbon, discharges through the baking oven exhaust outlet again, finishes summary of the invention 7 described oven dry circulation steps.
Gas enters baking oven from the baking oven exhaust outlet through exhaust duct, condensation retracting device, blast pipe, after blower fan pressurization, the heater heating and purges ribbon, discharges through the baking oven exhaust outlet again, finishes summary of the invention 7 described recovery circulation steps.
If backwind tube installs air door additional, exhaust duct or blast pipe also install air door additional, needn't increase circulating fan in the condensation retracting device, oven dry purges with reclaiming circulation and all uses blower fan in the hot-air seasoning device, can regulate oven dry circulation and the air quantity ratio that reclaims circulation by the cooperation of air door.If but have heat exchanger and windage bigger in the condensation retracting device, and had better increase the air quantity that a circulating fan guarantees to reclaim circulation, make the air quantity adjustment of two kinds of circulations flexibly independent more.
9, the bigger equipment of organic solvent use amount, as coating machine, dried answer a pager's call etc., its drying plant is more complicated huge, is formed by a plurality of unit combination usually, reduce the oven dry energy consumption for strengthening drying effect, the oven dry air-flow should design according to the method that summary of the invention 1 and summary of the invention 4 provide.
A kind of oven dry reclaimer perfect in addition on summary of the invention 5 bases is provided, and described hot-air seasoning device is made up of three drying units identical or inequality at least:
One of them first its part of drying unit A comprises first baking oven, first blower fan, first backwind tube and first exhaust duct, exhaust duct is connected between the exhaust outlet and condensation retracting device gas access of baking oven, the exhaust outlet that the air inlet of first blower fan is connected to exhaust duct first blower fan by first backwind tube directly or be connected to the air inlet of baking oven by airduct, exhaust duct, first backwind tube contains air door or does not contain air door, ribbon enters the hot-air seasoning device from this drying unit, this drying unit carry out an invention content 1 described low temperature step and summary of the invention 4 described oven dry circulation steps, gas purges in the drying unit inner loop;
Wherein have at least one second its part of drying unit B to comprise second baking oven, second blower fan, heater, second backwind tube, second backwind tube is connected between the air inlet of the baking oven exhaust outlet and second blower fan, the exhaust outlet of second blower fan directly or by airduct links to each other with the air inlet of heater, the air outlet of heater directly or by airduct links to each other with the air inlet of baking oven, the gas of discharging from second baking oven is through second backwind tube, second blower fan, the heater circular flow is back to second baking oven, this drying unit carry out an invention content 1 described high-temperature step and summary of the invention 4 described oven dry circulation steps, gas is at drying unit inner loop heating and blowing;
One of them the 6th its part of drying unit F comprises the 6th baking oven, the 6th blower fan, the 6th backwind tube and blast pipe, it is characterized in that: the 6th backwind tube is connected between the exhaust outlet and blast pipe of baking oven, condensation retracting device gas vent is connected to the air inlet of the 6th blower fan by blast pipe, the exhaust outlet of the 6th blower fan directly or be connected to the air inlet of baking oven by airduct, blast pipe, the 6th backwind tube contains air door or does not contain air door, ribbon leaves the hot-air seasoning device from this drying unit, this drying unit carry out an invention content 1 described preheating step and summary of the invention 4 described oven dry circulation steps, gas purges in the drying unit inner loop.
Under circulating fan promotes in the condensation retracting device, gas in the hot-air seasoning device flows by the contrary ribbon direct of travel of ribbon path of travel between the baking oven unit, enter the condensation retracting device after flowing out the hot-air seasoning device, recirculation is got back to the hot-air seasoning device, the content that carries out an invention 4 described recovery circulation steps.
10, the bigger equipment of organic solvent use amount, as coating machine, dried answer a pager's call etc., its drying plant is more complicated huge, is formed by a plurality of unit combination usually, reduce the oven dry energy consumption for strengthening drying effect, the oven dry air-flow should design according to the method that summary of the invention 1 and summary of the invention 4 provide.
A kind of oven dry reclaimer perfect in addition on summary of the invention 5 bases is provided, and described hot-air seasoning device is made up of three drying units identical or inequality at least:
One of them first its part of drying unit A comprises first baking oven, first blower fan, first backwind tube, the blast pipe and first exhaust duct, exhaust duct is connected between the exhaust outlet and condensation retracting device gas access of baking oven, the air inlet of first blower fan is connected to the exhaust duct of another adjacent drying unit by blast pipe, first backwind tube is connected between exhaust duct and the blast pipe, the exhaust outlet of first blower fan directly or be connected to the air inlet of baking oven by airduct, blast pipe, exhaust duct, first backwind tube contains air door or does not contain air door, ribbon enters the hot-air seasoning device from this drying unit, this drying unit carry out an invention content 1 described low temperature step and summary of the invention 4 described oven dry circulation steps, gas purges in the drying unit inner loop;
Wherein have at least one the 5th its part of drying unit E to comprise the 5th baking oven, the tendencies machine, the 5th blast pipe, the 5th backwind tube and the 5th exhaust duct, the exhaust outlet of the 5th baking oven is connected to the 5th blast pipe of adjacent drying unit by the 5th exhaust duct, the air inlet of tendencies machine is connected to the 5th exhaust duct of another adjacent drying unit by the 5th blast pipe, the 5th backwind tube is connected between the 5th exhaust duct and the 5th blast pipe, the exhaust outlet of tendencies machine directly or by airduct is connected to the air inlet of baking oven, the 5th blast pipe, the 5th exhaust duct, the 5th backwind tube contains air door or does not contain air door;
One of them the 6th its part of drying unit F comprises the 6th baking oven, the 6th blower fan, the 6th backwind tube, the 6th exhaust duct and the 6th blast pipe, the exhaust outlet of baking oven is connected to the blast pipe of adjacent drying unit by exhaust duct, the air inlet of the 6th blower fan is connected to condensation retracting device gas vent by blast pipe, the 6th backwind tube is connected between exhaust duct and the blast pipe, the exhaust outlet of the 6th blower fan directly or be connected to the air inlet of baking oven by airduct, blast pipe, exhaust duct, the 6th backwind tube contains air door or does not contain air door, ribbon leaves the hot-air seasoning device from this drying unit, this drying unit carry out an invention content 1 described preheating step and summary of the invention 7 described oven dry circulation steps, gas purges in the drying unit inner loop.
Under circulating fan promotes in the condensation retracting device, gas in the hot-air seasoning device flows by the contrary ribbon direct of travel of air inlet pipe, blast pipe that links to each other between the baking oven unit, enter the condensation retracting device after flowing out the hot-air seasoning device, recirculation is got back to the hot-air seasoning device, the content that carries out an invention 4 described recovery circulation steps.
The present invention both can be used for transforming existing equipment, also can be used in the designing and manufacturing of new equipment; Both can be used for single production equipment, also can be used in the production line of many plurality of devices mixing.Can realize the purpose of energy-saving and emission-reduction, safety and environmental protection.
[description of drawings]
Fig. 1 is traditional monomer-type drying plant schematic diagram.
Fig. 2 is the box-like drying plant schematic diagram of traditional group.
Fig. 3 is a principle schematic of the present invention.
Fig. 4 is the structural representation of ribbon access road.
Fig. 5 is the structural representation of ribbon admission passage inlet.
Fig. 6 is the structural representation of condensation retracting device.
Fig. 7 is the structural representation of first embodiment of the invention.
Fig. 8 is the structural representation of second embodiment of the invention.
Fig. 9 is the structural representation of third embodiment of the invention.
Among the figure: 00---ribbon
Each drying unit numbering of 10---hot-air seasoning device A, B, C, D, E, F---
101---hot-air seasoning device air inlet 102---hot-air seasoning device exhaust outlet
The outlet of 103---ribbon access road 104---ribbon
11---baking oven 111---baking oven gas access
112---baking oven gas vent 12---heater
13---blower fan 14---blast pipe
15---inlet air door 16---backwind tube
17---return air air door 18---exhaust duct
19---air draft blower fan 20---condensation retracting device
201---condensation retracting device gas access 202---condensation retracting device gas vent
21---condenser 22---heat exchanger
23---circulating fan 24---reservoir
25---refrigeration machine 30---gas shield device
301---circulation canal inlet 303---ribbon admission passage inlet
31---source of the gas 32---circulation canal inlet air valve
33---ribbon admission passage inlet air valve 34---loop control air door
35---the oxygen content sensor
[specific embodiment]
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1
Referring to Fig. 7, the oven dry reclaimer is used for supporting 8 look intaglio press in the present embodiment, and an oven dry reclaimer is joined in each look printing separately, and 8 oven dry reclaimers are identical.This oven dry reclaimer is made up of hot-air seasoning device 10, condensation retracting device 20, gas shield device 30.
As described in summary of the invention 14, hot-air seasoning device 10 is a kind of monomer baking oven forms of taking back wind, and the printing machine drying plant belongs to this type typical case mostly.The gas that comes autocondensation retracting device 20 is through 101 entering blast pipe 14 through entering the mouth, after entering air intake blower fan 13 pressurizations, heater via 12 heating are after baking oven gas access 111 enters baking oven 11 again, gas after pressurized, heated gas nozzle in baking oven 11 is ejected into ribbon 00 surface, the organic vapor that produces mixes the back and is sucked and be pooled to baking oven gas vent 112 by air entry in the baking oven 11 with gas, part enters into condensation retracting device 20 through exhaust duct 18, finish summary of the invention 4 described recovery circulation steps, other portion gas then directly enters into blast pipe 14 through backwind tube 16 and loops back baking oven 11 in the exhaust duct 18, finishes summary of the invention 4 described oven dry circulation steps.
Hot-air seasoning device exhaust outlet 102 is discharged gas and is entered into condensation retracting device 20 through condensation retracting device air inlet 201, and heat exchanger 22 is the fin heat pipe heat exchanger, and heat transfer temperature difference is 10 ℃.The cooling passage that 60 ℃ of gas enters heat exchanger 22 cools to 0 ℃, enters condenser 21 again.Condenser 21 is the copper tube and fin heat exchanger, the cold that utilizes refrigeration machine 25 to provide continues to cool to-10 ℃ to gas, the part organic vapor is recovered in the reservoir 24 after being condensed into liquid, organic vapor concentration drops to 1.67% (vol) from 3.8% (vol), remaining gas leaves the heat exchange intensification passage that condenser 21 enters heat exchanger 22 and is warmed up to 50 ℃ by-10 ℃, and the gas that has reclaimed most of heat leaves condensation retracting device 20 through gas vent 202 and gets back to hot-air seasoning device 10.
Nitrogen by the road, air valve 32 enters circulation canal by the inlet 301 that is installed on the exhaust duct 18, the gas that mixes in the circulation canal is discharged by ribbon access road as described in summary of the invention 5 103 simultaneously, access road 103 internal height are 6mm, and passage length is 120mm.As described in summary of the invention 5, the oxygen content sensors 35 that are installed in the baking oven 11 provide the oxygen content detected value, and air valve 32 adopts proportioning valves, can change the flow that nitrogen injects, and in service on average to inject flow with reference to nitrogen be 6m
3/ h, exhaust flow velocity 0.2m/s in the access road 103.
Before equipment brings into operation; close loop control air door 34 earlier; open air valve 32 static nitrogen injections; rely on nitrogen pressure to discharge the interior most of residual gas of circulation canal; treat that oxygen content drops to setting value 5% (vol) and opens air door 34 startup circulations again; implement dynamically to inject, can reduce the initial stage consumption of protective gas like this.
The source of the gas 31 of gas shield device 30 is a nitrogen making machine, gas production 60m
3/ h, purity 99% (vol), band 2m
3High pressure tank, supply gas pressure can be 8 oven dry reclaimer air feed greater than 0.4Mpa simultaneously.
All parts are by the unified control of central controller of printing machine, and all the sensors all links to each other with central controller.
The operation reference data: the recovery air circulation is 350m
3/ h, the oven dry air circulation is 2200m
3/ h, maximum organic vapor concentration 3.8%, 80 ℃ of baking oven gas access 111 temperature, 60 ℃ of baking oven gas vent 112 temperature.
In the present embodiment, oven dry circulation and recovery circulation are leaned on blower fan 13 and inlet air door 15 to cooperatively interact with return air air door 17 and are finished, and do not use independent circulating fan.
The above is one of in 8 supporting oven dry reclaimers of printing machine, and designing maximum solvent oven dry amount is 5g/s.
Embodiment 2
Referring to Fig. 8, the oven dry reclaimer is used for supporting coating machine in the present embodiment, and the maximum oven dry amount of coating machine organic solvent is 25g/s, and used organic solvent is based on toluene.This oven dry reclaimer is made up of hot-air seasoning device 10, condensation retracting device 20, gas shield device 30.
As described in summary of the invention 9, the hot-air seasoning device is made up of six drying units of A-F, wherein the first drying unit A is by first baking oven 113, first blower fan 131, first backwind tube and exhaust duct 18 are formed, first exhaust duct 181 is connected between the exhaust outlet and condensation retracting device air inlet 101 of baking oven, the air inlet of first blower fan is connected to exhaust duct 18 by first backwind tube, the exhaust outlet of first blower fan 131 is directly connected to the air inlet of baking oven, air door 34 is housed in the exhaust duct, ribbon 00 enters the hot-air seasoning device from access road 103, the first drying unit A carry out an invention content 1 described low temperature step and summary of the invention 4 described oven dry circulation steps, gas purges in the drying unit inner loop.
The second drying unit B to the, five drying unit E are by second baking oven 114, second blower fan 132, heater 12, second backwind tube 162, second backwind tube is connected between the baking oven exhaust outlet and the second baking oven air inlet, the exhaust outlet of second blower fan 132 directly links to each other with the air inlet of heater 12, the air outlet of heater 12 directly links to each other with the air inlet of baking oven 11, the gas that each unit baking oven is discharged is through second backwind tube, blower fan, baking oven is separately flowed back in the heater circulation, the content that carries out an invention 1 described high-temperature step and summary of the invention 4 described oven dry circulation steps, gas is at drying unit inner loop heating and blowing;
The 6th drying unit F is by the 6th baking oven 116, the 6th blower fan 136, the 6th backwind tube 166 and blast pipe 14 are formed, backwind tube is connected between the exhaust outlet and the 6th blast pipe 146 of baking oven, condensation retracting device gas vent 202 is connected to the air inlet of the 6th blower fan 136 by blast pipe, the exhaust outlet of the 6th blower fan 136 is directly connected to the air inlet of baking oven, ribbon 00 leaves hot-air seasoning device 10 from the outlet 104 of the 6th drying unit F, the 6th drying unit F carry out an invention content 1 described preheating step and summary of the invention 4 described oven dry circulation steps, gas purges in the 6th drying unit F inner loop, by heating up with ribbon 00 heat exchange.
Condensation retracting device 20 as shown in Figure 6, refrigeration machine 25 is an air-cooled refrigerator of kx-201A in the condensation retracting device 20, has the refrigerating capacity of 30kw for-15 ℃ the time in evaporating temperature.By electromagnetic expanding valve shunting, can be simultaneously provide cold for the oven dry reclaimer of many coating machines.Condenser 21 is the copper tube and fin heat exchanger, and condensation temperature is-10 ℃; Heat exchanger is the heat pipe fin heat exchanger, and heat transfer temperature difference is 10 ℃; The condensation removal process is identical with embodiment 1.
Under circulating fan 23 promoted, the gas in the hot-air seasoning device 10 flowed by the contrary ribbon direct of travel of ribbon path of travel between the baking oven unit, promptly flows to the 5th drying unit E from the 6th drying unit F, moves ahead successively, until flowing to the first drying unit A.Gas enters condensation retracting device 20 after the first drying unit A flows out hot-air seasoning device 10, recirculation is got back to hot-air seasoning device 10, the content that carries out an invention 4 described recovery circulation steps.
The source of the gas 31 of gas shield device 30 is a nitrogen making machine, gas production 60m
3/ h, purity 99% (vol), band 2m
3High pressure tank, supply gas pressure can be the oven dry reclaimer air feed of many coating machines greater than 0.4Mpa simultaneously.
As described in summary of the invention 5, the inlet of two protective gas is arranged in the present embodiment, circulation canal inlet 301 is installed in the blast pipe 18 to link to each other with circulation canal and communicates, and it injects air-flow by air valve 32 controls.Ribbon admission passage inlet 303 is installed in the ribbon access road 103, constitutes the vent line of the threeway of connection circulation canal, external environment condition and a gas shield device, and it injects air-flow and is subjected to air valve 33 controls.
Before equipment brings into operation; close loop control air door 34, air valve 33 earlier; open the air valve 32 static protective gas that inject; rely on protective gas pressure to discharge the interior most of residual gas of circulation canal; treat that oxygen content drops to 5% (vol) and opens air door 34, air valve 33 again; start each blower fan and begin gas circulation, implement dynamically to inject.Ribbon admission passage inlet 303 in service is by about 6m
3/ h flow injects constantly, and air valve 32 is pressed summary of the invention 1 described method control, and the upper safety limit value is 8% (vol), is limited to 5% (vol) in the adjustment, is limited to 2% (vol) under adjusting.Injection flow when circulation canal inlet 301 is opened is about 60m
3/ h can reduce the oxygen content of device interior apace.
Reference data: the recovery air circulation is 1800m
3/ h, each unit oven dry air circulation is 3000m
3/ h, each drying unit gas temperature and organic vapor concentration reference value are as follows:
F：70℃ 1.7％(vol)
E：180℃ 1.7％(vol)
D：160℃ 2.0％(vol)
C：130℃ 2.6％(vol)
B：90℃ 3.2％(vol)
A：60℃ 3.8％(vol)。
Embodiment 3
Referring to Fig. 9, present embodiment has adopted as summary of the invention 10 described hot-air seasoning devices 10, difference from Example 2 is that the 5th blast pipe 145, the 5th exhaust duct 185 contrary ribbon direct of travels that link to each other between air communication overbaking box unit between each drying unit flow, rather than embodiment 2 is described only depends on that the ribbon path of travel flows between the baking oven unit.The 5th backwind tube 165 and the 5th blast pipe 145 of each unit have all been installed air door, can adjust throughput neatly.
Above embodiment only understands content of the present invention for helping, and can not be considered as the restriction to content of the present invention.
Claims (9)
1. the oven dry recovery method of an organic solvent is applied to dry and reclaim the organic solvent that is distributed on the ribbon of advancing continuously, and the method includes the steps of:
Preparation process: after ribbon or its traction thing passed the oven dry reclaimer, closed oven dry reclaimer inner space, before the startup ribbon is advanced continuously, inject protective gas to oven dry reclaimer inner space, order about the gas discharge that the inner space mixes, make the inner space oxygen content be lower than setting value;
Protection step: inject protective gas to oven dry reclaimer inner space, order about the gas that the inner space mixes and discharge, make that oxygen content is lower than 16% (vol) in the gas of inner space;
Baking step: order about through heating or the ribbon of not advancing continuously through the gas purging of heating, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas;
Recycling step: will mix the gas cooled of organic vapor, and reduce the saturated concentration of organic vapor, will surpass and reclaim after saturated concentration organic vapor partly be condensed into liquid;
Circulation step: order about gas and between baking step and recycling step, circulate;
Described protection step comprises following steps:
Detect step: checkout equipment inner space gas oxygen content;
Alarming step: when the oxygen content detected value was higher than the upper safety limit value, maximum stream flow was injected protective gas to circulation canal, and output alarm signal forbids that ribbon advances;
Implantation step: the oxygen content detected value is higher than to be adjusted higher limit but when being lower than the upper safety limit value, starting to circulation canal and inject protective gas;
Keep step: the oxygen content detected value is lower than when adjusting lower limit, stops to inject protective gas to circulation canal;
Described baking step comprises following steps:
Preheating step: order about from the higher ribbon of the gas purging temperature of recycling step, to impel the organic solvent evaporation that remains on the ribbon be organic vapor and be mixed in the gas, reduces the ribbon temperature, preheating gas rising gas temperature;
High-temperature step: heat and order about gas purging ribbon from preheating step, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas rising ribbon and gas temperature;
Low temperature step: order about the gas purging ribbon from high-temperature step, to impel the organic solvent evaporation that is distributed on the ribbon be organic vapor and be mixed in the gas, adds organic vapor concentration in the atmospheric, reduces gas temperature.
2. the oven dry recovery method of organic solvent according to claim 1, the control range that it is characterized in that oxygen content in the gas of described inner space at 1% (vol) between 8% (vol).
3. the oven dry recovery method of organic solvent according to claim 1 is characterized in that described recycling step comprises following steps:
Cooling step: will carry out heat exchange from the gas and the condensed gas of baking step, and reduce gas temperature;
Condensing steps: cooling is through the gas of heat exchange cooling, reclaims after part organic vapor in the gas is condensed into liquid being blended in;
Heating step: will carry out heat exchange, the rising gas temperature through the cryogenic gas of condensation and gas from baking step.
4. the oven dry recovery method of organic solvent according to claim 1 is characterized in that described circulation step comprises following steps:
Oven dry circulation step: order about gas cycle purge ribbon in baking step, by the internal gas cycle purge, strengthen the throughput that purges belt surfaces, make in the abundant entrained gas of organic vapor, reduce near the organic vapor dividing potential drop of belt surfaces, quicken the evaporation of organic solvent;
Reclaim circulation step: order about gas circulation and flow to recycling step, flow back to baking step again from baking step.
5. the oven dry reclaimer of an organic solvent, comprise hot-air seasoning device (10), condensation retracting device (20) and gas shield device (30), it is characterized in that: hot-air seasoning device air inlet (101) is connected to condensation retracting device gas vent (202), hot-air seasoning device exhaust outlet (102) is connected to condensation retracting device gas access (201), the inner space of hot-air seasoning device and condensation retracting device forms gas circulation channel, and ribbon (00) enters the ribbon access road (103) of hot-air seasoning device as the gas channel between circulation canal and the external environment condition; Gas shield device is provided with circulation canal inlet (301) and links to each other with circulation canal; The oven dry reclaimer of described organic solvent also is provided with oxygen content sensor (35) and air valve, the probe of oxygen sensor is installed in the circulation canal, air valve is connected between gas shield device source of the gas and the inlet by tracheae, is used to control the flow that injects the circulation canal protective gas;
Described ribbon access road (103) is a contour or not contour narrow-gap channel, and the ribbon access road is along greater than the minimum slit internal height of channel interior H 6 times of the length L of ribbon direct of travel, i.e. L/H＞6; Ribbon outlet (104) is provided with a pair of rubber rollers to realize the shutoff to gas;
The circulation canal inlet (301) of described gas shield device (30) is installed in the exhaust duct (18), ribbon admission passage inlet (303) communicates with described ribbon access road (103), and the protective gas that injects by back one inlet forms the gas curtain that intercepts the inside and outside gas communication in the ribbon access road;
Described hot-air seasoning device comprises baking oven (11), exhaust duct (18), blast pipe (14), backwind tube (16), blower fan (13) and heater (12), the exhaust outlet of baking oven is connected to condensation retracting device gas access (201) by exhaust duct, condensation retracting device gas vent (202) is connected to the air inlet of blower fan by blast pipe, backwind tube is connected between exhaust duct and the blast pipe, the exhaust outlet of blower fan directly or be connected to the air inlet of heater by airduct, the air outlet of heater directly or by airduct is connected to the air inlet of baking oven, exhaust duct, blast pipe, backwind tube contains air door or does not contain air door.
6. according to the oven dry reclaimer of the described organic solvent of claim 5, it is characterized in that: described condensation retracting device (20) comprises heat exchanger (22) and condenser (21), heat exchanger has two-way to isolate mutually but the gas channel of heat exchange mutually, one the tunnel as the cooling passage, and another road is as the intensification passage; Heat exchanger cooling channel outlet links to each other with the condenser gas access, and heat exchanger intensification feeder connection links to each other with the condenser gas vent, and it is preceding and pass through gas heat exchange in heat exchanger behind the condenser to enter condenser.
7. according to the oven dry reclaimer of the described organic solvent of claim 5, it is characterized in that: described condensation retracting device (20) also comprises a circulating fan (23), the air outlet of circulating fan links to each other with heat exchanger (22) cooling feeder connection, sends into heat exchanger after the gas pressurized in the circulating fan extraction hot-air seasoning device.
8. according to the oven dry reclaimer of the described organic solvent of claim 5, it is characterized in that: described hot-air seasoning device (10) is made up of three drying units identical or inequality at least,
One of them its part of first drying unit (A) comprises first baking oven (113) and first exhaust duct (181) at least, first exhaust duct is connected between the exhaust outlet and condensation retracting device gas access (201) of first baking oven, and ribbon (00) enters the hot-air seasoning device from this drying unit;
Wherein have at least its part of one second drying unit (B) to comprise second baking oven (114), second blower fan (132), heater (12), second backwind tube (162), second backwind tube is connected between baking oven exhaust outlet and the air inlet, the exhaust outlet of second blower fan directly or by airduct links to each other with the air inlet of heater, the air outlet of heater directly or by airduct links to each other with the air inlet of baking oven, and the gas of discharging from this unit baking oven is back to second baking oven through backwind tube, second blower fan, heater circular flow;
One of them its part of the 6th drying unit (F) comprises the 6th baking oven (116), the 6th blower fan (136) and blast pipe (14) at least, condensation retracting device gas vent (202) is connected to the air inlet of the 6th blower fan by blast pipe, the exhaust outlet of the 6th blower fan directly or by airduct is connected to the air inlet of baking oven, and ribbon leaves the hot-air seasoning device from this drying unit.
9. according to the oven dry reclaimer of the described organic solvent of claim 5, it is characterized in that: described hot-air seasoning device is made up of three drying units identical or inequality at least,
One of them its part of first drying unit (A) comprises first baking oven (114) and first exhaust duct (181) at least, exhaust duct is connected between the exhaust outlet and condensation retracting device gas access (201) of baking oven, and ribbon (00) enters the hot-air seasoning device from this drying unit;
Wherein have at least its part of one the 5th drying unit (E) to comprise the 5th baking oven (115), tendencies machine (135), the 5th blast pipe (145), the 5th backwind tube (165) and the 5th exhaust duct (185), the exhaust outlet of the 5th baking oven is connected to the 5th blast pipe of other drying unit by exhaust duct, the air inlet of tendencies machine is connected to the 5th exhaust duct of another other drying unit by the 5th blast pipe, the 5th backwind tube is connected between exhaust duct and the 5th blast pipe, the exhaust outlet of tendencies machine directly or by airduct is connected to the air inlet of baking oven, the 5th blast pipe, the 5th exhaust duct, the 5th backwind tube contains air door or does not contain air door;
One of them its part of the 6th drying unit (F) comprises the 6th baking oven (116), the 6th blower fan (136) and the 6th blast pipe (146) at least, condensation retracting device gas vent (202) is connected to the air inlet of the 6th blower fan by blast pipe, the exhaust outlet of the 6th blower fan directly or by airduct is connected to the air inlet of the 6th baking oven, and ribbon (00) leaves the hot-air seasoning device from this drying unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100394286A CN101559290B (en) | 2009-05-12 | 2009-05-12 | Method for drying and reclaiming organic solvent and equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100394286A CN101559290B (en) | 2009-05-12 | 2009-05-12 | Method for drying and reclaiming organic solvent and equipment thereof |
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| CN101559290A CN101559290A (en) | 2009-10-21 |
| CN101559290B true CN101559290B (en) | 2011-11-30 |
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| CN2009100394286A Expired - Fee Related CN101559290B (en) | 2009-05-12 | 2009-05-12 | Method for drying and reclaiming organic solvent and equipment thereof |
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| CN104436960B (en) * | 2014-11-29 | 2016-08-17 | 河南国花彩印包装有限公司 | A kind of solvent recovering system of printing machine |
| CN106739175B (en) * | 2016-12-15 | 2019-03-19 | 中航复合材料有限责任公司 | A kind of aramid fiber paper honeycomb impregnation purification tunnel equipment |
| WO2018205058A1 (en) * | 2017-05-07 | 2018-11-15 | 赵水莲 | Flame and explosion prevention composite printing machine |
| CN112060444A (en) * | 2020-08-31 | 2020-12-11 | 浙江中科玖源新材料有限公司 | Polyimide film curing gas cyclic utilization's accuse temperature oven |
| CN113932143B (en) * | 2021-10-13 | 2023-05-02 | 广州市豪田机械设备有限公司 | Column type gas tank device for edge sealing process |
| CN115282619B (en) * | 2022-05-24 | 2024-10-29 | 温州市康泰生物科技有限公司 | System for quick removal of volatile solvents |
| CN115382228B (en) * | 2022-08-17 | 2024-07-12 | 杭州安永环保科技有限公司 | Method and device for evaporating and cooling materials at normal pressure and low temperature |
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