KR102006385B1 - Integrated reflow system with built-in heat recovery system and ductless air purifier - Google Patents

Abstract

The present invention relates to a reflow system with integrated built-in devices such as a heat exchanger, roll-to-roll dust collection device, air purification device and the like in addition to a condenser that condenses flux inside the reflow system. The reflow system with a built-in heat recovery device and air purification device is capable of reducing energy consumption, that is power consumption of reflow by recovering quantity of heat of high temperature, which is generated in reflow, re-injecting the same into a reflow furnace and preventing interference in an operation moving line in a small space like most factories. The reflow system of the present invention comprises: a heat recovery unit (100) including a heat recovery device for recovering quantity of heat of high temperature from contaminated air discharged from a reflow furnace (10) and an air purification device 1 for purifying contaminated air which has passed through the heat recovery device in real time and re-injecting purified air into the reflow furnace (10); and a purification unit (200) including an air purification device 2 for purifying contaminated air discharged from an inlet (30) and an outlet (40) at both sides of a reflow conveyor (20) in real time and discharging purified air to the inside (50).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated reflow system including a heat recovery apparatus and an air purification apparatus,

The present invention relates to a reflow system, which includes a condenser for condensing flux in a reflow system, and incorporates an integrated device such as a heat exchanger, a roll-to-roll dust collector, and an air purifier, The amount of heat of the reflow can be reduced and the amount of energy consumption of the reflow can be reduced. Also, the heat recovery device and the air purification device, which prevent the work copper from being disturbed in a narrow space, The present invention relates to an integrated reflow system having an integrated reflow system.

In general, Surface Mount Technology (SMT) is a method of attaching Surface Mounted Components (SMC), which can be directly mounted on the surface of a printed circuit board (PCB), to an electronic circuit This surface mount technology is made by soldering and uses reflow soldering equipment. Solder paste used in reflow equipment usually contains 75 to 92 wt.% Of solder alloy powder. The remainder is composed of resin (Rosin), viscosity increasing agent and lubricant as binder.

Conventional reflow equipment has produced pollutants such as fluxes (fluxes, liquid residue of fine particles) together with odor and volatile organic compounds (VOCs) in the resin during reflow soldering operation at a high temperature of about 250 ° C. However, It is all the matter that the pollutants are discharged to the air conditioner (duct) on the factory through the duct at the top of the reflow without any special treatment. In addition, some of the odor and volatile organic compounds leak out of the reflow equipment, polluting the air inside the plant, causing worker's headache.

In particular, since the existing reflow equipment can not discharge the flux generated during soldering to the outside, only about 10% is removed by the fume management system installed at the bottom of the reflow equipment, and the remaining reflow equipment is reflowed (Energy consumption) is increased because the flux is adhered to and accumulated in the panel heater inside the reflow furnace, thereby reducing the heat transfer effect of the panel heater. In addition, since the flux is accumulated in the panel heater Therefore, cleaning work for removing the flux attached to the panel heater is frequently performed at least once / month. As a result, the stoppage of the reflow operation and the labor cost are considerably reduced There are also problems that occur.

In addition, the fume management system installed at the bottom of the reflow should be cleaned about once a year. The cleaning cost is about 3,000,000 won. In addition, it is very difficult to remove the viscous sticky flux during cleaning, and the toxic flux odor Which is seriously damaging the health of workers.

At the same time, the contaminated air discharged from the reflow process is discharged at a high temperature of about 190 ° C. without any additional treatment for heat recovery, and the energy loss at the time of reflow operation is also serious .

Patent Document 1 of the prior art discloses a ductless air purifier for purifying contaminants such as odors and volatile organic compounds. The ductless air purifier is a combination of a low-temperature plasma reactor, a metal oxide catalyst, and an activated carbon to completely decompose / remove a malodorous or volatile organic compound, and then to discharge indoor air. Thus, an air conditioning facility such as a duct is not necessary. And it is also possible to prevent a decrease in productivity due to the shutdown of the duct due to the reinstallation of the duct when the production process is changed.

However, the high concentration of toxic smoke, dust, fine soot and flux generated during the reflow soldering process, which is caused by the processing of fine dust, flux, and polymer polyethylene resin in the laser process, can not be properly filtered by the pre- There is a problem that it is sucked intact.

The fine dust or flux which can not be removed by the pretreatment filter adheres to the electrode plate of the plasma reactor of the ductless air purifier, and the plasma reaction does not occur properly, so that the effect of decomposing and removing contaminants such as odor and volatile organic compounds Therefore, it is troublesome to stop the operation of the air purifier and periodically clean the electrode plate of the plasma reactor. In addition, metal oxide catalysts, activated carbon, and various filters are attached to some materials such as fine dust or flux. As a result, the replacement cycle is shortened to 3 to 4 months depending on the characteristics of the industrial site.

On the other hand, the contaminated air discharged from the reflow can not recover the heat (energy) contained in the high-temperature or high-temperature contaminated air at about 190 ° C., But also the problem of increasing the power consumption of the reflow occurs at the same time.

In addition, the ductless air cleaning apparatus is installed near both ends of the reflow apparatus, and when the space is narrow as in most factories, there is a disadvantage that the working line is disturbed.

On the other hand, Patent Document 2 of the prior art discloses a roll-to-roll dust collecting device for collecting and removing fine dust, flux, and the like that occur during reflow soldering. When the roll-to-roll dust collecting apparatus is mounted on the front end of the ductless air purifying apparatus, fine dust and flux are filtered and collected beforehand to remove the odor and decomposition / removal efficiency of the volatile organic compound in the plasma reactor. It is possible to increase the lifetime of the metal oxide catalyst, the activated carbon and the various filters by as much as one year. Accordingly, it is possible to prevent the operation of the ductless air cleaning apparatus due to the cleaning of the plasma electrode plate and to reduce the maintenance cost due to the extension of the life of various catalysts, activated carbon, and filters.

However, the temperature of the flux sucked into the roll-to-roll dust collector is in the gas (liquid) state of about 80 to 90 ° C., and some flux passes through the filter of the roll- And thus the ozone decomposition effect and the active oxygen generation are reduced on the catalyst surface due to the bleaching phenomenon. Therefore, when the time is prolonged, the decomposition and removal effect of the odor and the volatile organic compound is decreased .

Patent Document 1: Korean Patent Laid-Open Publication No. 2017-0112377 Patent Document 2. Korean Patent Application No. 2017-0087214

In order to solve the problems of the present invention, the present invention is characterized in that, by incorporating a single device such as a condenser, a roll-to-roll dust collector, a heat exchanger and an air purifier for condensing flux in a reflow system, So that the working environment is comfortable and the operation is not stopped due to the reinstallation of the duct. In addition, the polluted air such as volatile organic compounds is prevented from flowing out, and purified air is supplied to the room to solve the health problem of the workers at the same time.

In addition, it is possible to reduce the amount of energy consumed by reflow, that is, power consumption, by recycling the high-temperature heat generated in the reflow process and re-introducing the heat into the reflow furnace. In addition, An object of the present invention is to provide an integrated reflow system incorporating a heat recovery apparatus and an air purification apparatus which are not provided with a heat recovery apparatus.

In order to accomplish the above object, an integrated reflow system incorporating a heat recovery apparatus and an air purification apparatus of the present invention includes a heat recovery apparatus for recovering a high-temperature heat amount from contaminated air discharged from a reflow furnace, And an air purifying device 1 for purifying the contaminated air in real time and re-introducing it into the inside of the reflow furnace; And an air purifier 2 for purifying polluted air discharged from the inlet and outlet of both sides of the reflow conveyor in real time and discharging the polluted air to the room.

The heat recovery apparatus is composed of a heat exchanger and a condenser. The polluted air discharged from the reflow furnace is cooled to 80 to 90 캜 while passing through the heat exchanger, and cooled to 60 to 70 캜 while passing through the condenser, The air in the air is condensed and then transferred to the air purification apparatus 1.

The condenser may include a fan and a heat sink.

The air purifier 1 further includes a nonwoven filter 1 and a roll-to-roll dust collector for removing the condensed flux while passing through the condenser, a filter for removing odor and volatile organic compounds in the air passing through the dust filter of the roll- A low temperature plasma reactor and a medium filter for removing fine dust generated in a process of decomposing volatile organic compounds in the air passing through the low temperature plasma reactor are sequentially mounted in a kit chamber 1, The sliding method is applied.

In addition, the air purification apparatus 1 is formed as a by-product in the decomposition process of the ozone and the volatile organic compound in the air passing through the metal oxide catalyst, which removes residual ozone contained in the air passing through the kit chamber 1 And a blower for transferring the air passing through the adsorption filter and the HEPA filter into the reflow furnace are sequentially mounted on one kit chamber 2. The adsorbing filter and the HEPA filter are installed in the kit chamber 2 in order to adsorb and remove carbon monoxide and carbon dioxide.

When replacing at least one of the dust filter and the medium filter of the nonwoven filter 1, the roll-to-roll dust collector, and the medium filter in the kit chamber 1, the contaminated air passing through the condenser does not pass through the kit chamber 1 And is then bypassed to a separate nonwoven fabric filter 2 to remove the condensed flux and then transferred to the kit chamber 2.

The purified air that has been cooled to 65 to 70 占 폚 while passing through the air purifier 1 is raised to 110 占 폚 through the heat exchanger by using polluted air at 190 占 폚 discharged from the reflow furnace, And then recycled.

The heat recovery unit may include the heat exchanger, the condenser, the metal oxide catalyst, the adsorption filter, the HEPA filter, and the blower in a bonnet portion at the upper end of the reflow, and the nonwoven filter 1, The nonwoven fabric filter 2, the roll-to-roll dust collector, the low-temperature plasma reactor, and the medium filter.

The air purifier 2 is installed in the bonnet on both ends of the conveyor at the upper end of the reflow, and includes a condenser, and a medium filter, a low temperature plasma reactor or an ozone generator, a metal oxide catalyst, A HEPA filter, and a blower are sequentially mounted.

Also, the metal oxide catalyst may be a single metal oxide or a mixture of metal oxides, the amount of the metal oxide catalyst may be controlled in the range of 10,000 to 20,000 ^{hr -1} , and the shape of the metal oxide catalyst may be honeycomb, A pellet, and a corrugate type.

In addition, the suction air amount in the heat recovery part is adjusted between 1 and ⁴ m ³ / min, and the suction air amount in the purification part is adjusted between ¹ and 8 m ³ / min.

In addition, the volume ratio of the metal oxide catalyst and the adsorption filter included in the air purification apparatus 1 is 1: 2, and the volume ratio of the metal oxide catalyst and the adsorption filter provided in the air purification apparatus 2 is 2: 1.

Therefore, in the integrated reflow system incorporating the heat recovery apparatus and the air purification apparatus of the present invention, the flux in a gas-liquid state is condensed by using a condenser, and then filtered and collected by a roll- It is possible to prevent the defective product of the printed circuit board due to flux falling from the panel heater by preventing the flux from adhering to the panel heater and to reduce the energy consumption of the panel heater firstly by improving the heat transfer effect of the panel heater, The cleaning cycle of the heater is greatly extended from once / month to once / year, so that the operation of the reflow due to the cleaning can be prevented, and productivity can be expected to be improved.

In addition, the integrated reflow system of the present invention is advantageous in that the fume management system itself which needs to be cleaned about once a year is not needed, and the cleaning cost can be reduced, and the health of the operator can be assured from toxic flux.

In addition, the elimination of the flux can completely improve the efficiency of decomposition and removal of odors and volatile organic compounds in the plasma reactor of the air purifier, eliminates the need to clean the electrode plate of the plasma reactor from time to time, The lifetime of catalyst, activated carbon and various filters can be prolonged for a period of more than one year from the existing 3-4 months. Therefore, it is advantageous to prevent the operation stop due to the cleaning of the electrode plate of the plasma reactor and to reduce the maintenance cost due to the extension of the lifetime of various catalysts, activated carbon and filters.

Further, since the amount of heat contained in the contaminated air at a high temperature discharged from the reflow is recovered and reintroduced into the furnace of the reflow furnace, the energy and power consumption of the reflow can be reduced to two orders of magnitude. In addition, since the temperature of the reflow bonnet is maintained at 40 ° C or higher, the performance of the metal oxide catalyst is further improved, and the decomposition effect of contaminants such as volatile organic compounds by ozone is further increased.

In addition, the air purifier incorporated in the integral reflow completely cleans the odor and volatile organic compounds leaking from the inlet and the outlet of both sides of the reflow conveyor. Therefore, it is possible to create a comfortable indoor environment, It can be solved at the same time and the work concentration can be increased.

1 is a conceptual diagram of heat recovery of a heat recovery unit and real-time air purification process in an integrated reflow system according to the present invention.
2 is a configuration and a process diagram for a heat recovery unit in the integrated reflow system according to the present invention.
FIG. 3 is a schematic view of the condenser of the heat recovery unit in the integrated reflow system according to the present invention. FIG.
FIG. 4 is a schematic diagram showing a configuration of a roll-to-roll dust collector of a heat recovery unit in an integrated reflow system according to the present invention. FIG.
FIG. 5 is a schematic view showing the configuration of a low temperature plasma reactor of a heat recovery unit in an integrated reflow system according to the present invention. FIG.
FIG. 6 is a structural arrangement and a process diagram for the purifier in the integrated reflow system according to the present invention. FIG.
FIG. 7 is a photograph showing the removal of flux in contaminated air by the roll-to-roll dust collector of the integrated reflow system according to the present invention.
8 is a photograph of a defective product of the PCB plate due to the drop of the flux attached to the panel heater.
9 is a graph showing a power consumption reduction of the reflow system according to the application of the heat recovery apparatus.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention. .

The integrated reflow system incorporating the heat recovery apparatus and the air purification apparatus of the present invention is characterized in that the heat recovery apparatus for recovering the heat of high temperature from the polluted air discharged from the reflow furnace 10 and the purified air passing through the heat recovery apparatus A heat recovery unit 100 including an air cleaning apparatus 1 for re-introducing the air into the inside of the reflow furnace 10; And a purifier 200 including an air purifier 2 for purifying the purified water in real time and discharging the purified water to the room. The heat recovery unit 100 and the purifier 200 are installed together in one reflow system.

1 shows the concept of heat recovery and the real-time air purification process of the heat recovery unit in the integrated reflow system according to the present invention. The contaminated air of about 190 DEG C discharged from the reflow furnace 10 is first circulated through the heat exchanger 110, Cooled to about 80 to 90 DEG C and then cooled again to about 60 to 70 DEG C by using a heat sink type condenser 120 to condense the flux in the gas-liquid state contained in the polluted air , And the fine dust and the condensed flux are completely removed by the roll-to-roll dust collector 140 of the air-cleaning apparatus 1. The odor and volatile organic compounds in the polluted air from which the flux is removed are completely purified in real time by the air purifying device 1 and then heat exchanged using the contaminated air at high temperature discharged from the reflow furnace 10, (10). At this time, the purified air in the air purifying apparatus 1 is maintained at about 65 to 70 ° C, and the heat exchanger 110 heat-exchanges the polluted air at a high temperature of about 190 ° C, And then reintroduced into the inside.

Conventionally, since the polluted air at high temperature is discharged to the outside without any treatment for heat recovery, the energy and power consumption of the reflow are serious. However, by using the heat recovery apparatus of the present invention, the temperature of the panel heater can be uniformly maintained by the convection phenomenon by re-introducing the purified air raised to about 110 DEG C into the reflow furnace 10, Power consumption of 10% or more can be drastically reduced.

Integral type Reflow  The heat recovery unit

FIG. 2 shows a configuration and a process diagram for a heat recovery unit 100 of an integrated reflow system according to the present invention. A heat exchanger 110, a condenser 120, a metal oxide catalyst 170, A nonwoven filter 1 132, a roll-to-roll dust collector 140, a low-temperature plasma (not shown), and a low-temperature plasma (not shown) The reactor 150 and the medium filter 160 are located.

The contaminated air at a high temperature of about 190 DEG C discharged in the integrated reflow furnace 10 is heat-exchanged with the purified air through the heat exchanger 110 and is transferred to the condenser 120 shown in FIG. At this time, the contaminated air conveyed to the condenser 120 is cooled to 80 to 90 ° C in the heat exchange process. The cooled air is cooled again in the condenser 120 of the heat sink 122 type having the fan 124, Of the flux is condensed, and it is preferable that the flux is cooled to about 60 to 70 占 폚.

Relatively large particles among the flux passing through the condenser 120 are firstly filtered by the nonwoven filter 131 and the fine dust and the remaining small particles are completely removed by the roll-to-roll dust collector 140 shown in FIG. Collect and remove. By doing so, it is possible to prevent residual fine dust or flux from adhering to the subsequent low-temperature plasma reactor 150 or the metal oxide catalyst 170, and to substantially completely improve the decomposition and removal effects of odor and volatile organic compounds The present invention eliminates the need to clean the electrode plates 151 and 152 of the low-temperature plasma reactor 150 from time to time and removes the problems of the various filters including the metal oxide catalyst 170, the adsorption filter 180 and the HEPA filter 182, Can extend the life span of one year or more for a considerable period of time.

The roll-to-roll dust collecting apparatus 140 includes a dust collecting filter 142, a driving unit 144, a driven unit 146, and a collecting unit 148. The dust-collecting filter 142 is wound in a roll shape with a certain width and slightly spread by the driving part 144 in a state of being mounted on the driven shaft (not shown) of the driven part 146 and passing through the collecting part 148 Fine dust, smoke, dust, soot, flux, and the like are collected and collected while proceeding to the driving unit 144. At this time. The traveling speed of the dust filter 142 can be adjusted between 2 and 10 cm / sec.

The low-temperature plasma reactor 150 is operated in a DBD (Dielectric Barrier Discharge) mode to decompose odor or volatile organic compounds contained in the polluted air passing through the roll-to-roll dust collector 140 using ozone generated by generating plasma at room temperature do. 5, the low-temperature plasma reactor 150 includes a boosting device 154 for boosting the voltage of the power supplied from the power supply unit 155, a first electrode plate 152 to which a power source boosted by the booster 154 is applied, (151) and a second electrode plate (152). It is preferable that the first electrode plate 151 and the second electrode plate 152 are arranged so as to be sequentially crossed so that air can flow into a space between the electrode plates. In this case, the first electrode plate 151 and the second electrode plate 152 are preferably arranged so as to be generally arranged in three to ten stages. On the other hand, the booster 154 is preferably boosted to a high voltage in the range of 10 to 20 KV.

Next, the air passing through the low-temperature plasma reactor 150 may include odors or minute dusts that may be generated in the decomposition process of the volatile organic compounds, which are completely removed again by the medium filter 160.

The metal oxide catalyst 170 decomposes the residual ozone contained in the polluted air passing through the low-temperature plasma reactor 150 or the ozone generator (not shown) into active oxygen, Decompose undissolved unreacted volatile organic compounds. In this case, examples of the catalyst for decomposing ozone include platinum, Cr oxide, Al oxide, Co oxide, Cu oxide, Mn oxide, metal Pd or Pd compound, among which metal oxides are preferably used. Examples of such metal oxide catalysts include MnO ₂ , NiO, CoO, Fe ₂ O ₃ , V ₂ O ₅ , and AgO ₂ . In addition, a mixture of various metal oxides as well as a single metal oxide may be used. For example, in the form of MnO ₂ -CuO, MnO ₂ -AgO ₂ , Mn ₂ O ₃ -TiO ₂ and NiO-CoO-AgO ₂ . The metal oxide catalyst may be a honeycomb type, a pellet type or a corrugated type.

Accordingly, the metal oxide catalyst 170 decomposes the remaining volatile organic compounds that have not yet been decomposed in the low-temperature plasma reactor 150 in the previous stage to remove them near perfection, and decomposes the ozone, The function of reducing the ozone concentration to an extremely low level is performed at the same time. At this time, it is preferable that the volume of the metal oxide catalyst 170 (amount of metal oxide catalyst used) is set so that the space velocity is between 10,000 and 20,000 (hr ^-1 ) with respect to the process air flow rate (flow rate). In this case, the space velocity is defined according to the following equation.

Space velocity (hr ^-1 ) = Flow rate (m ³ / hr) ÷ Volume of catalyst (m ³ )

Next, the adsorption filter 180 adsorbs carbon monoxide (CO) and carbon dioxide (CO ₂ ) produced as byproducts in the decomposition process of the air that has passed through the metal oxide catalyst 170, that is, the ozone or the volatile organic compound · Remove. In this case, the adsorption filter 180 may include a honeycomb type activated carbon or a pellet type activated carbon.

It is preferable that the volume ratio of the metal oxide catalyst 170 to the adsorption filter 180 is 1: 2 since the heat recovery unit 100 recycles the purified air into the reflow furnace 10.

The adsorption filter 180 may further include a HEPA filter 182. The HEPA filter 182 removes at least 99.97% of fine particles of 0.3 mu m or more and then blows the purified air to reflow 10). At this time, the temperature of the air after the purification is about 65 to 70 ° C. The temperature of the air after the purification is elevated to about 110 ° C. by using the polluted air at a high temperature of about 190 ° C. discharged from the reflow furnace 10, The temperature of the panel heater can be uniformly maintained by the convection phenomenon, so that the power consumption of the reflow can be drastically reduced by 10% or more.

The nonwoven filter 131, the roll-to-roll dust collector 140, the low-temperature plasma reactor 150 and the medium filter 160 located at the lower end of the reflow in the heat recovery unit 100 can be mounted in one kit chamber 1 In this case, the dust filter 142 of the nonwoven fabric filter 131 or the roll-to-roll dust collector 140 and the medium filter 142 of the roll-to-roll dust collector 140 can be easily removed from the reflow furnace. (160) can be easily replaced. Remove the fume management system at the bottom of the existing reflow and place the kit chamber 1 in place.

The metal oxide catalyst 170, the adsorption filter 180 and the HEPA filter 182 and the blower 190 located at the upper end of the reflow in the heat recovery unit 100 can be mounted in one kit chamber 2, When replacing the catalyst or filter, open the reflow upper bonnet cover so that it can be easily replaced.

2, when the nonwoven fabric filter 131 located at the lower end of the reflow, the dust filter 142 of the roll-to-roll dust collector 140, and the medium filter 160 are to be replaced, 120 to the direct nonwoven fabric filter 2 (132) by using a T pipe to remove the condensed flux, and then, using a T pipe, a kit located directly on top of the reflow And passes through the metal oxide catalyst 170 of the chamber 2 and the adsorption filter 180 and the HEPA filter 182. In this case, reflow operation is not stopped even when the catalyst and various filters are replaced.

In the heat recovery unit 100, the intake air amount by the blower 190 is about 2m ³ / min, preferably from about 1~4m ³ / min.

The operation sequence of the heat recovery unit 100 is as follows.

Normal operation: suction from reflow furnace → heat exchanger → condenser → kit chamber 1 (nonwoven filter 1 - roll to roll dust collector - low temperature plasma reactor - medium filter) → kit chamber 2 (metal oxide catalyst - adsorption filter - Blower) → heat exchanger → reflux.

When replacing the filter: Inhale from the reflow furnace → Heat exchanger → Condenser → By-pass (T piping) → Nonwoven filter 2 → Kit chamber 2 (Metal oxide catalyst - Adsorption filter - HEPA filter - Blower) → Heat exchanger → Reflow Put into the inside.

Integral type Of reflow  Purifying section

The arrangements, roles and processes of the respective components for the purifier 200 in which the air purifier 2 for purifying odor and volatile organic compounds discharged from the inlet / outlet portions 30 and 40 of the reflow conveyor 20 are incorporated Will be described.

As shown in FIG. 6, the air purifying apparatus 2 of the purifying unit 200 is provided at each of the end bonnet portions of the upper and lower ends of the reflow upper end so that the odor and volatile organic compounds emitted from the inlet / outlet portions 30 and 40 of the conveyor 20 It is preferable to purify the compound or the like. At this time, a condenser 210, a medium filter 220, a low temperature plasma reactor 230 or an ozone generator (not shown), a metal oxide catalyst 240, an adsorption filter 250, a HEPA filter 252, A blower 260 and the like.

The polluted air discharged from both sides of the integral reflow conveyor 20 has a temperature of about 80 to 90 DEG C and is cooled in a heat sink type condenser 210 shown in FIG. 3 to condense the flux in a gas-liquid state And preferably cooled to about 50 to 60 占 폚.

The flux passing through the condenser 210 is completely collected and removed by the medium filter 220. In this case, the fine dust or flux contained in the polluted air discharged from both sides of the reflow conveyor 20 can be effectively removed by only the medium filter 220 because it is much smaller than the polluted air discharged from the reflow furnace 10 .

The medium filter 220 is a pretreatment filter, which is used to physically collect dust, etc., of a large size to improve the efficiency of subsequent purification and decomposition steps.

The contaminated air from which the fine dust or flux is removed from the medium filter 220 is decomposed by the ozone generated by the plasma generated at room temperature from odor or volatile organic compounds contained in the polluted air in the low temperature plasma reactor 230.

The configuration of the low temperature plasma reactor 230 of the purifying unit 200 is the same as that of the low temperature plasma reactor 150 of the heat recovery unit 100 and the voltage boosting unit 154 is configured to boost the voltage to a high voltage in the range of 10 to 20 KV .

Since the odor and volatile organic compounds contained in the contaminated air discharged from both sides of the reflow conveyor 20 are relatively smaller than the contaminated air discharged from the reflow furnace 10, The two-electrode plate 152 is preferably arranged so as to be arranged in an order of three to five stages, and an ozone generator may be used instead of the low-temperature plasma reactor 230.

The metal oxide catalyst 240 decomposes residual ozone contained in the polluted air passing through the low temperature plasma reactor 230 into active oxygen and then decomposes the unreacted volatile organic compounds The compound is decomposed. At this time, the metal oxide catalyst 240 further decomposes remaining volatile organic compounds that have not been decomposed in the low-temperature plasma reactor 230 in the previous stage and removes them close to perfection. In addition, the metal oxide catalyst 240 decomposes the ozone, And the function of reducing the concentration to an extremely low level. The volume and space velocity of the metal oxide catalyst 240 of the purifier 200 and the type and shape of the metal oxide are the same as those of the metal oxide catalyst 170 of the heat recovery unit 100.

The adsorption filter 250 adsorbs and removes carbon monoxide (CO) and carbon dioxide (CO ₂ ) generated as byproducts in the process of decomposing pollutants in air passing through the metal oxide catalyst 240, that is, ozone or volatile organic compounds. In this case, the adsorption filter 250 may be configured to include a honeycomb type activated carbon or a pellet type activated carbon.

Since the purifying unit 200 discharges purified air to the room, it is preferable that the volume ratio of the metal oxide catalyst 240 to the adsorption filter 250 is 2: 1.

The adsorption filter 250 may further include a HEPA filter 252. The HEPA filter 252 removes 99.97% or more of fine particles of 0.3 mu m or more, and then discharges the purified air to the room. At this time, the temperature of the air after purifying is about 40 ~ 45 ℃, the temperature of the work place is kept at 25 ~ 26 ℃ due to the air conditioner operation and the air venting about 4 times per hour during summer. And the power consumption is reduced when the radiator is operated.

A low temperature plasma reactor 230 or an ozone generator, a metal oxide catalyst 240, an adsorption filter 250, a HEPA filter 252, a blower (not shown) disposed in the reflux unit 200, 260 can be mounted on one kit chamber 3, and when the catalyst or the filter is replaced, the reflow upper bonnet cover can be opened and replaced easily.

Suction air amount by the blower 260 from the purification section 200 is about 4m ³ / min, preferably from about 1~8m ³ / min.

The normal operation sequence of the purifier 200 is as follows.

Normal operation: suction of both sides of the conveyor → condenser → kit chamber 3 (medium filter - low temperature plasma reactor or ozone generator - metal oxide catalyst - adsorption filter - hepafilter - blower) → indoor exhaust.

Hereinafter, the present invention will be described with reference to several embodiments.

≪ Example 1 > (Effect of reducing the temperature of contaminated air by a condenser)

① Measuring method of temperature reduction effect

 As shown in FIG. 3, a condenser was manufactured as a heat sink type, and the temperature reduction effect was examined by measuring the temperature of the polluted air passing through the heat exchanger through the condenser and the condenser after passing through the heat exchanger.

At this time, the temperature was measured at an interval of 1 hour from 2 hours after the reflow reached the normal operation, and the suction air volume by the blower was ³ m ³ / min.

② Result of temperature reduction effect of contaminated air

The temperature of the polluted air was 79.3 ℃ at the front of the condenser and 58.1 ℃ at the end after passing through the condenser at 1 hour after the reflow reached the normal operating condition and it was decreased by about 21 ℃ by the condenser.

After 8 hours of operation, the temperature of the polluted air at the front of the condenser was 85.5 ° C, and at the rear of the condenser it was 63.8 ° C, which was reduced by about 21.7 ° C.

In general, even if the reflow operation time continues, the temperature of the contaminated air after the condenser passes is maintained at about 63 ° C., and the temperature decrease width of the contaminated air is kept constant at about 21 ° C., ≪ / RTI > can be very effectively condensed.

Measurement result of temperature decrease of polluted air by condenser time
Temperature (℃) One 2 3 4 5 6 7 8 Condenser shear 79.3 81.9 83.4 84.3 84.6 85.2 85.5 85.5 Back of condenser 58.1 60.1 61.7 62.5 62.7 63.8 63.8 63.8

≪ Example 2 > (Effect of removing flux by roll-to-roll dust collector)

 ① How to measure flux removal effect

The roll-to-roll dust collector shown in FIG. 4 was used to visually measure the effect of removing the flux contained in the contaminated air generated during soldering in reflow.

The contaminated air generated when the solder paste was melted in the furnace at about 250 DEG C by charging the PCB plate with the solder paste into the reflow was condensed with the condenser as in Example 1, And collected on one side of the filter of the apparatus.

The flux removal effect measurement was carried out by measuring the degree of collecting on each side over the 5th order by varying the number of PCB plates.

At this time, the suction air flow rate was ³ m ³ / min, which was the same condition as that of Example 1, and a performance test was performed on the flux removal effect.

       Experimental conditions for measuring flux removal effect from reflow Number of measurements
Item Primary Secondary Third Fourth 5th  Number of PCB charge (sheets) 46 92 138 184 244 Solder paste amount (gr) 184 368 552 736 976

② Flux removal effect measurement result

As shown in FIG. 7, as the number of PCB plates with solder paste applied increases, the flux collected on one surface of the filter in the roll-to-roll housing is increasingly attached. In addition, it can be seen that the flux is completely collected in the filter because the vapor in the gas-liquid state is condensed in advance by the condenser.

As in the fifth experiment, even when the amount of solder paste is used at 976 gr, the pressure difference is not generated by the filter attached with flux, and the air flow is good.

It can be seen that up to 1,000gr of solder paste can be processed on one side of filter of roll-to-roll dust collector, and it can be used up to 24 hours on one side of filter in industrial field.

In this way, the flux is removed by the roll-to-roll dust collecting apparatus to prevent the flux from adhering to the panel heater in the reflow furnace, thereby preventing the product failure phenomenon that is caused by dropping the flux on the PCB plate .

≪ Example 3 > (Effect of reducing power consumption of reflow)

① Measuring power consumption according to application of heat recovery system

As shown in the schematic diagram of the heat recovery apparatus of FIG. 1, the cleaned air in real time by the air purifier is elevated to about 110 ° C. by a heat exchanger by using the polluted air at a high temperature of about 190 ° C. discharged from the reflow furnace, And then re-injected into the inside of the reflow furnace to reduce the power consumption of the reflow.

At this time, the suction air flow rate was measured at 4 m ³ / min, which is the same condition as that in the industrial field, using a cumulative meter before and after the application of the heat recovery apparatus.

② Result of power consumption measurement of reflow

9, the power consumption of the reflow is about 50 Kwh before application of the heat recovery apparatus, but after the application is reduced to about 44.6 Kwh, the power of about 5.4 Kw is decreased for about 4 hours, and the power consumption is reduced by about 11% Respectively.

Therefore, if the amount is converted into the amount, the power cost of about 1,774,000 won per year can be saved by the effect of applying the heat recovery system.

           Power saving (days): 1.35Kw x 24hr = 32.4Kwh

                           32.4 Kwh x 150 yuan / Kwh = 4,860 yuan / day

           Power saving (month): 4,860 won / day x 30 days = 145,800 won / month

           Annual power saving cost: 4,860 won / day x 365 days = 1,773,900 won

Example 4 (Effect of removing volatile organic compounds by air purifier)

① Measures to remove volatile organic compounds (VOCs)

The performance test for the removal efficiency of volatile organic compounds was carried out at the indoor environment analysis center of Seoul National University.

At this time, in the low-temperature plasma reactor of the air purifier, the applied voltage was 15 KV, the air volume was ³ m ³ / min, and the space velocity was 17,000 hr ^-1 .

② Results of VOC removal test

The removal efficiencies of the total volatile organic compounds (total VOCs) are as follows. That is, the total volatile organic compound concentration of the polluted air discharged from the reflow furnace is about 77931.3 μg / m 3, whereas the concentration of total volatile organic compounds after the air purification apparatus is reduced to about 205.6 μg / ㎥, which is 99.7% Removal efficiency. In particular, the concentration of total volatile organic compounds (205.6 μg / ㎥) after air purification is only about half that of indoor standard (500 μg / ㎥).

Benzene is not present in any of the representative five volatile organic compounds after air purification treatment, and toluene is 18.6 μg / m 3, ethylbenzene is 10.7 μg / m 3, xylene is 13.3 μg / m 3 and styrene is 0.8 μg / (Benzene, toluene, ethylbenzene, xylene, styrene) are also being effectively removed, which is much lower than the indoor standard value.

Removal of Volatile Organic Compounds by Air Purifier Metrics
Measuring position Measurement item (㎍ / ㎥) T.VOCs benzene toluene Ethylbenzene Xylene Styrene Suction portion 77931.3 - 526.4 305.5 353.3 25.4 The discharge portion 205.6 - 18.6 10.7 13.3 0.8

Example 5 (Effect of ozone removal by metal oxide catalyst)

① Measuring method of ozone removal effect

The initial ozone concentration in the low temperature plasma reactor of the air purifier and the concentration of ozone (ozone) after passing through the metal oxide catalyst of the air purifier were measured.

Is this case, at a low temperature plasma reactor of the air purifying device voltage was to 15KV, the air volume is 3m ³ / min and the space velocity was 17,000hr ^- to measure the concentration of ozone in the ^first.

② Ozone removal effect measurement result

The initial ozone concentration in the low-temperature plasma reactor was about 40 ppm, while the volatile organic compounds were decomposed after the reaction in the metal oxide catalyst. The ozone concentration in the finally discharged air was about 0.015 ppm, and the ozone removal efficiency , Which is within the tolerance limits for ozone concentration in Korea and the United States.

- Korea Ozone Concentration Limit: 0.1ppm for 1 hour, 0.06ppm for 8 hours

- US Ozone concentration limit: 8 hours or 40 hours per week 0.1 ppm, 15 minutes 0.3 ppm

The present invention can be applied to various fields. In other words, the demand for air purifiers that decompose and deodorize volatile organic compounds, pollutants, and odors emitted from dyeing, printing, paint and plating processes as well as electronic and semiconductor markets such as soldering processes is expected to increase rapidly.

Due to the improvement in quality of life, the need for purification facilities in general hospitals or nursing homes is also on the rise, so the outlook is very encouraging. Furthermore, it can be applied to laboratories of laboratories and factories in universities and research institutes using toxic chemicals. Do.

In the case of an electronic component manufacturing process, productivity can be increased by solving the headache problem caused by the gas caused by the ink application.

It is also applicable to the purification treatment of volatile gases such as ammonia and methane generated in pig housing.

It is also very effective in the treatment of soot generated from soot of automobiles in tunnels and the like, as well as in the purification treatment of flux, toxic gas, and volatile organic compounds generated upon combustion of fuel.

At the present time when smoking cessation facilities are expanding rapidly according to the government's strong smoking cessation policy, applying the flux removal technology and air purification technology to the smoking booth not only eliminates the smell of cigarette smoke but also enables efficient treatment of harmful cigarette smoke components.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

100: Heat recovery unit
110: Heat exchanger
120, 210: condenser
122: Heat sink
124: Fan
131, 132: Nonwoven filter 1, 2
140: roll-to-roll dust collector
150, 230: low temperature plasma reactor
160, 220: Medium filter
170, 240: metal oxide catalyst
180, 250: Adsorption filter
182, 252: HEPA filter
190, 260: Blower
200: purifying section

Claims (12)

In the reflow system,
A heat recovery apparatus for recovering a high temperature heat from the polluted air discharged from the reflow furnace 10 and an air circulating system for purifying the polluted air passing through the heat recovery apparatus in real time and returning the purified air to the inside of the reflow furnace 10 A heat recovery unit 100 including a purifier 1; And
A purifier 200 including an air purifier 2 for purifying contaminated air discharged from an inlet 30 and an outlet 40 on both sides of the reflow conveyor 20 in real time and discharging the purified air to the room 50; Respectively,
The heat recovery unit of the heat recovery unit 100 includes a heat exchanger 110 and a condenser 120. The heat exchanger 110 has a dual structure including an inner pipe and an outer pipe surrounding the inner pipe from the outside Piping,
The polluted air that flows into the outer pipe from the reflow furnace 10 and is cooled while passing through the heat exchanger 110 is further cooled through the condenser 120 to cool the polluted air in the gas- After the flux is condensed, it is transferred to the air purification apparatus 1,
The purified air having passed through the air purifying device 1 flows into the inner pipe of the heat exchanger 110 and is discharged from the reflow furnace 10 and is used to remove the high temperature polluted air surrounding the inner pipe And then recycled to the inside of the reflow furnace (10) after the temperature of the reflow furnace (10) is raised. delete delete The method according to claim 1,
The air purifier 1 includes a nonwoven filter 131 and a roll-to-roll dust collector 140 for removing condensed flux while passing through the condenser 120, a dust filter 142 of the roll- A low temperature plasma reactor 150 for removing bad odors and volatile organic compounds in the air passing through the low temperature plasma reactor 150 and a medium filter 150 for removing minute odors generated in the air passing through the low temperature plasma reactor 150 and decomposition of volatile organic compounds Wherein the kit chamber (1) is installed in one kit chamber (1) sequentially, and a sliding method is applied to the kit chamber (1). The heat recovery device and the integrated reflow system. The method according to claim 4,
The air cleaning apparatus 1 includes a metal oxide catalyst 170 for removing residual ozone contained in air passing through the kit chamber 1, a decomposition process of ozone and volatile organic compounds in the air passing through the metal oxide catalyst 170 The adsorption filter 180 and the HEPA filter 182 for adsorbing and removing carbon monoxide and carbon dioxide generated as byproducts from the adsorption filter 180 and the HEPA filter 182 are transferred to the reflow furnace 10 Wherein the blower (190) is sequentially mounted on one kit chamber (2). The method according to claim 5,
When replacing at least one of the nonwoven filter 131, the dust filter 142 of the roll-to-roll dust collector 140 and the medium filter 160 in the kit chamber 1, So that the contaminated air passed through the kit chamber 1 is bypassed to the separate nonwoven filter 2 (132) without passing through the kit chamber 1 to remove the condensed flux and then transferred to the kit chamber 2. [ And an integrated reflow system with built-in air purifier. delete The method according to claim 1,
The heat recovery unit 100 includes a heat exchanger 110, a condenser 120, a metal oxide catalyst 170, an adsorption filter 180, a HEPA filter 182, and a blower 190 ),
Characterized in that a nonwoven filter (131), a nonwoven filter (132), a roll-to-roll dust collector (140), a low temperature plasma reactor (150) and a medium filter (160) are located at the lower end of the reflow And an integrated reflow system with built-in air purifier. The method according to claim 1,
The air purifier 2 of the purifier 200 is installed at both sides of a bonnet at both ends of a conveyor 20 at the top of the reflow and includes a condenser 210 and a medium filter 220, Characterized in that a low temperature plasma reactor (230) or an ozone generator, a metal oxide catalyst (240), an adsorption filter (250), a HEPA filter (252) and a blower (260) Integrated reflow system. The method according to claim 5 or 9,
The metal oxide catalyst may be a single metal oxide or a mixture of metal oxides. The amount of the metal oxide catalyst may be controlled in the range of 10,000 to 20,000 ^{hr -1} . The metal oxide catalyst may be a honeycomb, a pellet, Wherein the heat recovery device and the air purification device are integrated with each other. The method according to claim 1,
Wherein the suction air volume in the heat recovery unit (100) is adjusted between 1 and ⁴ m ³ / min, and the suction air volume in the purifier unit (200) is adjusted between ¹ and 8 m ³ / min. Integrated reflow system with built-in purifier. The method according to claim 1,
The volume ratio of the metal oxide catalyst 170 and the adsorption filter 180 provided in the air purification apparatus 1 is 1: 2 and the volume ratio of the metal oxide catalyst 240 and the adsorption filter 250, which are provided in the air purification apparatus 2, Is a ratio of 2: 1. The integrated reflow system incorporates a heat recovery apparatus and an air purification apparatus.

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