JP6789583B2 - Integrated reflow system with built-in heat recovery device and air purification device - Google Patents

Description

The present invention relates to a reflow system, which includes a condenser that condenses flux in the reflow system, incorporates an integrated device such as a heat exchanger, a roll-to-roll dust collector, and an air purification device, and reflows. By recovering the generated high-temperature heat and re-injecting it into the reflow furnace, the energy consumption of reflow, that is, the power consumption can be reduced, and in a small space like most factories. It relates to an integrated reflow system with a built-in air purification device and a heat recovery device that keeps the work flow line unobstructed.

In general, surface mount technology (Surface Mount Technology, SMT) turns surface mounted components (SMC), which can be mounted directly on the surface of a printed circuit board (PCB), into electronic circuits. As a method of adhesion, such surface mount technology is performed by the soldering method and uses Reflow Soldering equipment. Solder Paste, which is used for soldering with reflow equipment, usually contains 75-92 wt.% Solder alloy powder, with the rest as binders such as resin, viscosity enhancer and lubricant. It is composed of agents and the like.

Conventional reflow equipment is a pollutant such as flux (Flux, liquid state of fine particles) from resin to malodor and volatile organic compounds (VOCs) during reflow soldering work at a high temperature of about 250 ° C. Nowadays, all of these pollutants are discharged to the outside by the air conditioner (duct) on the factory through the duct on the upper stage of the reflow without any other treatment. In addition, some of the malodor and volatile organic compounds leaked from the reflow equipment and polluted the air inside the factory, causing headaches for workers, which has a serious adverse effect on human health as well as hindering the working environment.

In particular, the existing reflow equipment has a structure that does not allow the flux generated during soldering to be discharged to the outside, so only about 10% is removed by the Fume Management System installed at the bottom of the reflow equipment. However, the rest is only circulated in the reflow furnace (爐) again. As a result, the flux adheres to and accumulates on the panel heater inside the reflow furnace and reduces the heat transfer effect of the panel heater, which not only increases the power consumption (energy consumption) but also accumulates and adheres to the panel heater. Since the flux is dropped onto the printed circuit board and causes poor quality, cleaning work to remove the flux adhering to the panel heater is frequently performed at least once a month, which causes reflow. There is also the problem of significant operational interruptions and labor consumption.

In addition, the fume management system installed in the lower part of the reflow also has to be cleaned about once a year, but the cleaning cost is about 3 million yen, and the viscous sticky flux is removed at the time of cleaning. Not only is the work very difficult, but a large amount of toxic flux odor is released, which seriously harms the health of workers.

At the same time, the contaminated air discharged from the reflow has a high temperature of about 190 ° C, but it is discharged to the outside as it is without any special treatment for recovering the heat, and energy loss occurs during the reflow operation. It is also true that it has reached a serious level.

Patent Document 1, which is a prior art, describes a ductless air purification device for purifying pollutants such as malodors and volatile organic compounds. The ductless air purification device can completely decompose / remove malodors and volatile organic compounds with a combination of low-temperature plasma reactor-metal oxide catalyst-activated carbon, and then discharge it into the room, so that air-conditioning facilities such as ducts can use it. Not only is it possible to reduce the labor and cost required to install air-conditioning facilities such as ducts, but it is also possible to prevent a drop in productivity due to operational interruptions due to duct re-installation when the production process is changed. ..

However, the pretreatment filter removes fine dust and flux generated during reflow soldering, and high-concentration toxic smoke, dust, fine soot and flux generated during processing of high molecular weight polyethylene resin in the laser process. There is a problem that it cannot be filtered properly and is sucked as it is into the ductless air purification device.

In this way, substances such as fine dust and flux that have not been removed by the pretreatment filter adhere to the electrode plate of the plasma reactor of the ductless air purification device, and the plasma reaction cannot occur properly, resulting in foul odors and volatile emissions. There is a problem that the decomposition / removal effect of pollutants such as volatile organic compounds is reduced. As a result, the operation of the air purification device is interrupted, and the trouble of having to clean the electrode plate of the plasma reactor on a regular basis follows. In addition, some substances such as fine dust and flux adhere to metal oxide catalysts, activated carbon, and various filters, which weakens the performance and shortens the replacement cycle to about 3 to 4 months depending on the characteristics of the industrial site. The problem is also appearing.

On the other hand, the polluted air discharged by reflow has a high temperature of about 190 ° C inside and outside, but the amount of heat (energy) contained in the hot polluted air cannot be recovered, and only the air. Since it is purified and discharged into the room as it is, there is a problem that not only the temperature in the factory room is raised but also the power consumption of reflow is increased.

Further, the ductless air purification device is installed beside both ends of the reflow equipment, and has a disadvantage that the work flow line is obstructed when the space is small as in most factories.

On the other hand, Patent Document 2, which is a prior art, describes a roll-to-roll dust collector for collecting and removing fine dust and flux generated during reflow soldering. If the roll-to-roll dust collector is installed in front of the ductless air purification device, fine dust and flux are filtered and collected in advance to remove them, so that malodor and volatile organic compounds are decomposed from the plasma reactor.・ Not only can the removal efficiency be dramatically improved, but the trouble of having to clean the electrode plate of the plasma reactor at any time is eliminated, and the life of the metal oxide catalyst, activated carbon, and various filters is extended. It may be extended for a considerable period of about one year. This has the advantage of preventing interruptions in operation due to cleaning of the plasma electrode plate of the ductless air purification device, and reducing maintenance costs by extending the life of various catalysts, activated carbon, and filters.

However, the temperature of the flux sucked by the roll-to-roll dust collector is about 80 to 90 ° C, and most of it exists in the state of gas and liquid (ki liquid), and some of the flux is roll-to-roll collection. It passes through the filter of the dust collector as it is and adheres to the metal oxide catalyst. This has the disadvantage of causing a bleaching phenomenon and reducing the decomposition effect of ozone and the production of active oxygen on the catalyst surface. Therefore, over a long period of time, the result is decomposition of malodor and volatile organic compounds. The problem that the removal effect is reduced has appeared.

(Patent Document 0001) Patent Document 1. Republic of Korea Published Patent Publication No. 2017-0112377 (Patent Document 0002) Patent Document 2. Republic of Korea Patent Application No. 2017-0087214

In order to solve the problems of the present invention, the present invention incorporates an integrated device such as a condenser for condensing flux, a roll-to-roll dust collector, a heat exchanger, and an air purification device in the reflow system. By doing so, the work environment becomes comfortable without the need for air-conditioning facilities such as ducts on the upper stage of reflow, and while preventing operational interruptions due to duct re-installation, the outflow of contaminated air such as volatile organic compounds is prevented and purified. It is possible to supply the air to the room and solve the health problems of workers at the same time.

In addition, by recovering the high-temperature heat generated by the reflow and reintroducing it into the reflow furnace, the energy consumption of the reflow, that is, the power consumption can be reduced, and like most factories. The challenge is to provide an integrated reflow system with a built-in heat recovery device and air purification device that does not interfere with the work flow line in a narrow space.

In order to achieve the above-mentioned problems, the integrated reflow system incorporating the heat recovery device and the air purification device of the present invention is a heat recovery device that recovers a high temperature amount of heat from the contaminated air discharged from the reflow furnace (爐). , The heat recovery unit including the first air purification device that purifies the contaminated air that has passed through the heat recovery device in real time and recharges it into the inside of the reflow furnace, and is discharged from the inlets and outlets on both sides of the reflow conveyor. It is characterized by being composed of a purification unit including a second air purification device that purifies the contaminated air in real time and discharges it into the room.

Further, the heat recovery device is composed of a heat exchanger and a condenser, and the contaminated air discharged from the reflow furnace is cooled to 80 to 90 ° C. through the heat exchanger and then 60 to 60 to 90 through the condenser. It is characterized in that it is cooled to 70 ° C., the flux in a gas-liquid state is condensed in the contaminated air, and then transferred to the first air purification device.

Further, the condenser is characterized by including a fan and a heat sink (Heat Sink).

In addition, the first air purifying device is a first non-woven filter that removes condensed flux through the condenser, a roll-to-roll dust collector, and a roll-to-roll dust collector. A low-temperature plasma reactor that removes malodor and volatile organic compounds in the air that has passed through a dust filter, and fine dust that is generated during the decomposition process of malodor and volatile organic compounds in the air that has passed through the low-temperature plasma reactor. The medium filters are sequentially mounted in one first kit chamber, and pulling out or mounting the first kit chamber is characterized by applying a sliding method.

Further, the first air purification device includes a metal oxide catalyst that removes residual ozone contained in the air that has passed through the first kit chamber, and ozone exhausted ozone in the air that has passed through the metal oxide catalyst. An adsorption filter and hepa filter that adsorbs and removes carbon monoxide and carbon dioxide produced as by-products in the decomposition process of volatile organic compounds, and a blower that transfers the air that has passed through the adsorption filter and the hepa filter into the reflow furnace. It is characterized in that it is sequentially mounted in one second kit chamber.

Further, when one or more of the first non-woven fabric filter, the dust collecting filter of the roll-to-roll dust collector, and the medium filter are replaced in the first kit chamber, the filter passes through the condenser. The contaminated air is transferred to the second kit chamber after removing the condensed flux by bypassing it to a separate second non-woven fabric filter without passing through the first kit chamber. It is characterized by being done.

Further, the purified air cooled to 65 to 70 ° C. through the first air purification device rises to 110 ° C. via the heat exchanger using the 190 ° C. contaminated air discharged from the reflow furnace. It is characterized in that it is recharged into the reflow furnace after being charged.

Further, in the heat recovery unit, the heat exchanger, the condenser, the metal oxide catalyst, the adsorption filter, the hepa filter and the blower are located in the bonnet portion which is the upper part of the reflow, and the lower part of the reflow. The part is characterized in that the first non-woven fabric filter, the second non-woven fabric filter, the roll-to-roll dust collector, the low temperature plasma reactor, and the medium filter are located.

Further, the second air purification device is installed at each of the bonnets at both ends of the conveyor in the upper stage of the reflow, includes a condenser, and has a medium filter, a low temperature plasma reactor, or an ozone generator in one third kit chamber. , A metal oxide catalyst, an adsorption filter, a hepa filter and a blower are sequentially attached.

Further, as the metal oxide catalyst, a single metal oxide or a mixture of metal oxides is used, and the amount of the metal oxide catalyst is adjusted in the space velocity range of 10,000 to 20,000 hr ^-1 to that of the metal oxide catalyst. The morphology is characterized by being one of any of Honeycomb, Pellet, and Corrugate types.

Further, the intake air amount in the heat recovery unit is adjusted between 1 to 4 m ³ / min, the intake air amount by the purification unit, characterized in that it is adjusted between 1~8m ³ / min.

Further, the volume ratio of the metal oxide catalyst provided in the first air purification device to the adsorption filter is 1: 2, and the volume ratio of the metal oxide catalyst provided in the second air purification device to the adsorption filter is 1: 2. It is characterized by being 2: 1.

Therefore, in the integrated reflow system incorporating the heat recovery device and the air purification device of the present invention, the flux in the gas-liquid state is condensed by using the condenser, and then filtered and captured by the roll-to-roll dust collector. Since it collects and removes completely, it prevents the flux from adhering to the reflow panel heater, prevents product defects of the printed circuit board due to the flux falling from the panel heater, and improves the heat transfer effect of the panel heater. Therefore, energy (electricity) consumption can be reduced in the first place. As a result, the panel heater cleaning cycle starts once a month.
It is greatly extended once a year, and it is possible to prevent interruption of reflow operation due to cleaning, and productivity improvement can be expected.

In addition, the integrated reflow system of the present invention does not require the fume management system itself, which must be cleaned about once a year, and it reduces cleaning costs and guarantees the health of workers from toxic flux. It has the advantage of being able to.

In addition, by removing the flux, not only can the plasma reactor of the air purification device completely improve the decomposition and removal efficiency of malodors and volatile organic compounds, but also the electrode plate of the plasma reactor must be cleaned at any time. The troublesomeness is eliminated, and the life of metal oxidation catalysts, activated carbon, and various filters can be extended from the existing 3 to 4 months to 1 year or more. Therefore, there is an advantage that operation interruption due to cleaning of the electrode plate of the plasma reactor is prevented, and maintenance cost is reduced by extending the life of various catalysts, activated carbon and filters.

In addition, since the amount of heat contained in the high-temperature contaminated air discharged from the reflow is recovered and reintroduced into the reflow furnace, the effect of secondarily reducing the energy and power consumption of the reflow is expected. be able to. At the same time, since the temperature is maintained at 40 ° C. or higher at the reflow bonnet site, the performance of the metal oxide catalyst is further improved, and the effect of decomposing pollutants such as volatile organic compounds by ozone is further increased.

In addition, the air purification device built into the integrated reflow completely inhales and purifies the malodor and volatile organic compounds leaking from the inlet and outlet of both reflow conveyors, so a comfortable indoor environment can be created. It has the advantage of being able to solve the problems of worker health and headaches at the same time and increase the degree of work concentration.

It is a conceptual diagram of the heat recovery of the heat recovery part and the real-time air purification process in the integrated reflow system which concerns on this invention. It is a structure, arrangement and process diagram of the heat recovery part in the integrated reflow system which concerns on this invention. It is a structural schematic diagram of the condenser of a heat recovery part in the integrated reflow system which concerns on this invention. It is a block diagram of the roll-to-roll dust collector of a heat recovery part in the integrated reflow system which concerns on this invention. It is a block diagram of the low temperature plasma reactor of a heat recovery part in the integrated reflow system which concerns on this invention. It is a structure, arrangement and process diagram of the purification part in the integrated reflow system which concerns on this invention. It is a photograph of the flux removal effect in the contaminated air by the roll-to-roll dust collector of the integrated reflow system according to the present invention. This is a photograph of a defective PCB board product due to the dropping of flux adhering to the panel heater. It is a graph of saving the power consumption of the reflow system by applying the heat recovery device.

The terms and words used herein and in the scope of the claims must not be construed in a general or lexical sense, and the inventor shall bestify his invention in the best possible way. To explain, it should be interpreted with meanings and concepts that are consistent with the technical ideas of the present invention, in line with the principle that the concepts of terms can be properly defined.

Therefore, the embodiments described herein and the configurations illustrated in the drawings are merely one of the most preferred embodiments of the present invention and do not represent the technical ideas of the present invention. At the time of filing, it must be understood that there may be a variety of equivalents and variants that can replace them.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. First, it should be noted that the same components or parts are indicated by the same reference numerals as much as possible in the drawings, and in the description of the present invention, specific explanations relating to such known functions or configurations are given. , The gist of the present invention is abbreviated so as not to be ambiguous.

The integrated reflow system incorporating the heat recovery device and the air purification device of the present invention recovers high-temperature heat from the contaminated air discharged from the reflow furnace (10) in real time through the heat recovery device and the heat recovery device. A heat recovery unit (100) composed of a first air purification device that purifies and recharges the inside of the reflow furnace (10), and inlets (30) and outlets (40) on both sides of the reflow conveyor (20). It is composed of a purification unit (200) including a second air purification device that purifies the contaminated air discharged from the air in real time and discharges it into the room, and these heat recovery units (100) and purification unit (200) are It is built and installed together in one reflow system.

FIG. 1 shows the concept of heat recovery and real-time air purification treatment of the heat recovery unit in the integrated reflow system according to the present invention. First, the contaminated air at about 190 ° C. discharged from the reflow furnace (10) is heat. It is cooled to about 80 to 90 ° C through a exchanger (110), cooled again to about 60 to 70 ° C using a heat sink (Heat Sink) type condenser (120), and contained in the contaminated air. After condensing the flux in the state of the gas (ki liquid), the fine dust and the condensed flux are completely removed by the roll-to-roll dust collector (140) of the first air purification device. Then, the malodor and volatile organic compounds in the contaminated air from which the flux has been removed are completely purified in real time by the first air purification device, and then the high-temperature contaminated air discharged from the reflow furnace (10). After exchanging heat using the above, it is recharged inside the reflow furnace (10).
At this time, the air purified by the first air purifier maintains about 65 to 70 ° C, and heat is exchanged from the heat exchanger (110) with high-temperature contaminated air of about 190 ° C to about 110 ° C. The principle is that after raising the temperature, it is recharged inside the reflow furnace (10).

In the existing, high-temperature contaminated air is discharged to the outside as it is without any separate treatment for heat recovery, so that the energy and power consumption of reflow have become serious. However, by re-injecting purified air that has risen to about 110 ° C into the inside of the reflow furnace (10) using a heat recovery device as in the present invention, the temperature of the panel heater is maintained uniform by the convection phenomenon. Since the effect can be obtained, the power consumption of reflow can be significantly reduced by 10% or more.

Heat recovery unit of integrated reflow system

FIG. 2 shows the configuration, arrangement, and process diagram of the heat recovery unit (100) of the integrated reflow system according to the present invention. The heat exchanger (110) and the condenser (120) are located in the upper bonnet portion of the reflow. ), Metal oxide catalyst (170), adsorption filter (180), hepa filter (182), and blower (190) are located, and the first non-woven fabric filter (131) and the second non-woven fabric filter (131) are located at the bottom of the reflow. 132), roll-to-roll dust collector (140), low temperature plasma reactor (150) and medium filter (160) are located.

The contaminated air with a high temperature of about 190 ° C. discharged from the integrated reflow furnace (10) exchanges heat with the purified air through the heat exchanger (110) and becomes the condenser (120) shown in FIG. Be transferred. At this time, the contaminated air transferred to the condenser (120) is cooled to 80 to 90 ° C. in the heat exchange process, cooled again by a heat sink (122) type condenser (120) equipped with a fan (124), and then cooled again. It is preferable to condense the gas-liquid (gas-liquid) flux and cool it to about 60 to 70 ° C.

The relatively large particles in the flux that passed through the condenser (120) are first filtered through the first non-woven fabric filter (131), and the flux of fine dust and the remaining small particles is the roll shown in FIG. Perfectly collects and removes with a two-roll dust collector (140). By doing so, it is possible to prevent residual fine dust and flux from adhering to the subsequent low-temperature plasma reactor (150) and metal oxide catalyst (170), and decompose foul odors and volatile organic compounds. Not only can the removal effect be enhanced almost perfectly, but the hassle of having to clean the electrode plates (151, 152) of the low temperature plasma reactor (150) at any time has been eliminated, and the metal oxide catalyst (170) has been eliminated. ), The life of various filters including the adsorption filter (180) and the hepa filter (182) can be extended for a considerable period of one year or more.

The roll-to-roll dust collector (140) includes a dust collecting filter (142), a driving unit (144), a driven unit (146), and a collecting unit (148). The dust collection filter (142) is wound in a roll shape with a certain width, and is mounted on the driven shaft (not shown) of the driven unit (146) little by little by the driving unit (144). It spreads and passes through the collecting part (148) to filter and collect fine dust, smoke, dust, soot, flux, etc., and proceeds to the driving part (144) for collection. At this time, the traveling speed of the dust collecting filter (142) can be adjusted between 2 and 10 cm / sec.

The low-temperature plasma reactor (150) generates plasma at room temperature by using the DBD (Dielectric Barrier Discharge) method to generate foul odors and volatile organic compounds contained in the contaminated air that has passed through the roll-to-roll dust collector (140). It decomposes using the ozone generated by the plasma. As shown in FIG. 5, the low-temperature plasma reactor (150) is provided with a booster (154) that boosts the voltage of the power supplied from the power supply unit (155) and a booster (154) that boosts the voltage. It is preferable that the first electrode plate (151) and the second electrode plate (152) are included. It is preferable that the first electrode plate (151) and the second electrode plate (152) are sequentially cross-arranged so that air can flow and pass through the space between the electrode plates. In this case, it is preferable that the first electrode plate (151) and the second electrode plate (152) are usually cross-arranged in about 3 to 10 stages. On the other hand, the booster (154) preferably boosts the voltage at a high voltage in the range of 10 to 20 KV.

Next, the air that has passed through the low-temperature plasma reactor (150) can contain malodors and fine dust that can be generated during the decomposition process of volatile organic compounds, which is medium. Completely remove again with a filter (160).

The metal oxide catalyst (170) uses active oxygen after decomposing residual ozone contained in contaminated air that has passed through a low-temperature plasma reactor (150) or ozone generator (not shown) with active oxygen. Then, the unreacted volatile organic compounds that have not been decomposed by the low temperature plasma reactor (150) are decomposed. In this case, examples of the catalyst for decomposing ozone include platinum, Cr oxide, Al oxide, Co oxide, Cu oxide, Mn oxide, metal Pd, Pd compound and the like. Among them, it is preferable to use a metal oxide. Examples of these metal oxide catalysts include MnO ₂ , NiO, CoO, Fe ₂ O ₃ , V ₂ O ₅ , and AgO ₂ . Moreover, not only a single metal oxide but also a mixture of a plurality of metal oxides can be used. For example, it can be used in the form of MnO _2- CuO, MnO _2- AgO ₂ , Mn ₂ O _3- TiO ₂ and NiO-CoO-AgO ₂ . Then, as the metal oxide catalyst, any of honeycomb type, pellet type and corrugate type may be used.

Therefore, the metal oxide catalyst (170) additionally decomposes residual volatile organic compounds that have not yet been decomposed in the low temperature plasma reactor (150) of the previous stage, and removes ozone exhaust as well as near perfection. At the same time, it decomposes and reduces the ozone concentration in the air that is finally discharged to an extremely low level. At this time, the volume of the metal oxide catalyst (170) (the amount of the metal oxide catalyst used) shall be determined so that the space velocity is between 10,000 and 20,000 (hr ^-1 ) with respect to the processing air volume (flow rate). Is preferable. In this case, the space velocity is defined by the following equation.

Space velocity (hr ^-1 ) = flow rate (m ³ / hr) ÷ catalyst volume (m ³ )

The adsorption filter (180) then uses carbon monoxide (CO), which is produced as a by-product in the process of decomposing contaminants in the air that have passed through the metal oxide catalyst (170), namely ozone emissions or the volatile organic compounds. ) And carbon dioxide (CO2) are adsorbed and removed. In this case, the adsorption filter (180) can be configured to include a honeycomb type activated carbon or a pellet type activated carbon.

On the other hand, since the heat recovery unit (100) recharges the purified air into the reflow furnace (10), the volume ratio of the metal oxide catalyst (170) and the adsorption filter (180) should be 1: 2. Is preferable.

Further, the adsorption filter (180) can be configured to further include a HEPA filter (182), and the HEPA filter (182) is purified after removing 99.97% or more of fine particles of 0.3 μm or more. The recharged air is reinjected into the reflow furnace (10). At this time, although the temperature of the air after purification is about 65 to 70 ° C, heat is exchanged using the high-temperature convection air of about 190 ° C discharged from the reflow furnace (10) to exchange heat with about 110 ° C. By re-injecting the heat into the reflow furnace (10) after raising the temperature to 10% or more, the effect of maintaining the temperature of the panel heater uniformly by the convection phenomenon can be obtained. It can be saved in a period.

On the other hand, the non-woven fabric filter (131), the roll-to-roll dust collector (140), the low-temperature plasma reactor (150) and the medium filter (160) located at the lower stage of the reflow in the heat recovery unit (100) are one of the first. It is manufactured so that it can be mounted on the kit chamber of No. 1, and a sliding method is adopted so that the kit chamber can be easily taken out of the reflow. In this case, the replacement work of the first non-woven fabric filter (131), the dust collection filter (142) of the roll-to-roll dust collector (140), and the medium filter (160) becomes easier. Then, the Fume Management System at the bottom of the existing reflow is removed, and the first kit chamber is positioned there.

In addition, the metal oxide catalyst (170), adsorption filter (180), HEPA filter (182), and blower (190) located in the upper stage of the reflow in the heat recovery unit (100) are mounted in one second kit chamber. By making it so that it can be replaced, when replacing the catalyst or filter, the bonnet cover on the upper stage of the reflow can be opened and replaced easily.

On the other hand, when replacing the first non-woven fabric filter (131) located at the bottom of the reflow, the dust collection filter (142) of the roll-to-roll dust collector (140), the medium filter (160), etc., Fig. 2 As shown in, the contaminated air that has passed through the condenser (120) is bypassed (by-pass) using a T-pipe and directly transferred to the second non-woven fabric filter (132) to disperse the condensed flux. Remove and again use the T-pipe to pass directly through the metal oxide catalyst (170), adsorption filter (180) and hepa filter (182) of the second kit chamber located in the upper stage of the reflow. In this case, there is an advantage that the reflow operation is not interrupted even when the catalyst and various filters are replaced.

Intake air amount by the heat recovery unit from (100) blower (190) is about 2m ³ / min, preferably from about 1 to 4 m ³ / min.

The operation procedure of the heat recovery unit (100) is as follows.

Normal operation: Suction from reflow furnace → heat exchanger → condenser → 1st kit chamber (1st non-woven fabric filter --roll-to-roll dust collector --low temperature plasma reactor --medium filter) → 2nd kit chamber (Metal oxide catalyst --Adsorption filter --HEPA filter --Blower) → Heat exchanger → Put inside the reflow furnace.

When changing filters: Suction from reflow furnace → heat exchanger → condenser → bypass (T pipe) → second non-woven fabric filter → second kit chamber (metal oxide catalyst --adsorption filter --hepa filter --bull lower) → heat Exchanger → Put inside the reflow furnace.

Integrated reflow purification unit

Arrangement and role of each configuration of the purification unit (200) with a built-in second air purification device that purifies the malodor and volatile organic compounds discharged from the inlet / outlet units (30, 40) on both sides of the reflow conveyor (20). And the process will be described.

As shown in FIG. 6, the second air purification device of the purification unit (200) is installed at both ends of the bonnet portion of the upper stage of the reflow and is discharged from the inlet / outlet portions (30, 40) of the conveyor (20). It is preferable to purify and treat malodors and volatile organic compounds. At this time, the second air purifier includes a condenser (210), a medium filter (220), a low temperature plasma reactor (230), an ozone generator (not shown), a metal oxide catalyst (240), and adsorption. Includes filters (250), hepa filters (252), blowers (260), etc.

The temperature of the contaminated air discharged from both of the integrated reflow conveyors (20) is about 80 to 90 ° C, and it is cooled by the heat sink type condenser (210) shown in Fig. 3 and gas-liquid (flux). It is preferable to condense the flux in the state and cool it to about 50 to 60 ° C.

The flux that has passed through the condenser (210) is completely collected and removed from the medium filter (220). In this case, the amount of fine dust and flux contained in the contaminated air discharged from both the reflow conveyor (20) is relatively less than that of the contaminated air discharged from the reflow furnace (10), so that the medium filter ( 220) alone can be effectively removed.

The medium filter (220) is used as a pretreatment filter to physically collect large-sized dust and the like first, and to improve the efficiency of the subsequent purification and decomposition steps.

The polluted air from which fine dust and flux have been removed by the medium filter (220) is the ozone generated by generating plasma at room temperature from the malodor and volatile organic compounds contained in the polluted air from the low temperature plasma reactor (230). Use and disassemble.

On the other hand, the configuration of the low temperature plasma reactor (230) of the purification unit (200) is the same as that of the low temperature plasma reactor (150) of the heat recovery unit (100), and the booster (154) is in the range of 10 to 20 KV. It is preferable to boost the voltage at a high voltage.

In this case, the malodor and volatile organic compounds contained in the contaminated air discharged from both the reflow conveyors (20) are relatively smaller than the contaminated air discharged from the reflow reactor (10). It is preferable that the first electrode plate (151) and the second electrode plate (152) are usually cross-arranged in about 3 to 5 stages, and instead of the low temperature plasma reactor (230). An ozone generator may be used for this.

The metal oxide catalyst (240) decomposes residual ozone contained in the contaminated air that has passed through the low-temperature plasma reactor (230) with active oxygen, and then uses the active oxygen to use the low-temperature plasma reactor (230). ) Decomposes unreacted volatile organic compounds that have not been decomposed. At this time, the metal oxide catalyst (240) additionally decomposes the residual volatile organic compounds that have not been decomposed from the low-temperature plasma reactor (230) in the previous stage and removes them almost completely, as well as ozone exhaust. At the same time, it decomposes and reduces the ozone concentration in the final discharged air to an extremely low level. The volume and space velocity of the metal oxide catalyst (240) of the purification unit (200), and the type and form 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) is a contaminated water in the air that has passed through a metal oxide catalyst (240), that is, carbon monoxide (CO) and carbon dioxide produced as by-products during the decomposition process of ozone exhaust or volatile organic compounds. Adsorbs and removes (CO2). In this case, the adsorption filter (250) can be configured to include a honeycomb type activated carbon or a pellet type activated carbon.

Since the purification unit (200) discharges the purified air into the work place room, the volume ratio of the metal oxide catalyst (240) and the adsorption filter (250) is preferably 2: 1.

The adsorption filter (250) can be further composed of a HEPA filter (252), and the HEPA filter (252) removes 99.97% or more of fine particles of 0.3 μm or more, and then purifies the air. Is discharged indoors. At this time, the temperature of the air after purification is set to about 40 to 45 ° C, and the temperature of the workplace is maintained at 25 to 26 ° C in the summer by operating the air conditioner and discharging the air conditioner about 4 times per hour, and in the winter. Air at 40 to 45 ° C is discharged indoors, which has the effect of reducing power consumption when the heater is in operation.

Medium filter (220), low temperature plasma reactor (230), or ozone generator, metal oxide catalyst (240), adsorption filter (250), hepa filter (hepa filter) located in the upper bonnet part of the reflow in the purification unit (200). 252), the blower (260) is manufactured so as to be mounted in one third kit chamber, and when the catalyst or filter is replaced, the bonnet cover on the upper stage of the reflow can be opened and replaced easily.

Intake air amount by the blower (260) from the purification unit (200) is about 4m ³ / min, preferably from about 1~8m ³ / min.

The procedure for normal operation of the purification unit (200) is as follows.

Normal operation: Conveyor both suction → Condenser → 3rd kit chamber (medium filter --low temperature plasma reactor or ozone generator --metal oxide catalyst --adsorption filter --hepa filter --blower) → discharge into the room.

The present invention will be described below with reference to some examples.

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

1 Measurement method of temperature reduction effect

As shown in Fig. 3, a condenser is manufactured with a heat sink type, and the temperature of the contaminated air discharged from the reflow furnace and passing through the heat exchanger is measured at the front stage of the condenser and the rear stage after passing through the condenser. Then, the temperature reduction effect was compared and examined.

At this time, the temperature was measured at 1-hour intervals from 2 hours after the operation, which was the time when the reflow reached normal operation, and the intake air volume by the blower was set to 3 m ³ / min.

2 Measurement result of temperature reduction effect of contaminated air

One hour after the reflow reaches the normal operating conditions, the temperature of the contaminated air is about 79.3 ° C in the first stage of the condenser, and it appears at about 58.1 ° C in the second stage after passing through the condenser. It decreased by about 21 ° C.

After operating for 8 hours, the temperature of the contaminated air appeared at 85.5 ° C in the front stage of the condenser, and appeared at about 63.8 ° C in the rear stage of the condenser, decreasing by about 21.7 ° C.

In general, the temperature of the contaminated air after passing through the condenser is maintained at about 63 ° C., and the temperature decrease of the contaminated air is maintained at a constant temperature of about 21 ° C. even if the reflow operation time elapses. From this, it can be seen that the gas-liquid flux in the contaminated air is condensed very effectively.

Measurement result of temperature decrease of contaminated air by condenser

<Example 2> (Flux removal effect by roll-to-roll dust collector)

1 Measurement method of flux removal effect

Using the roll-to-roll dust collector shown in Fig. 4, the effect of removing the flux contained in the contaminated air generated during soldering during reflow was visually measured.

A PCB plate coated with solder paste is charged into the reflow, and the contaminated air generated when the solder paste melts in a furnace at about 250 ° C. is condensed with a condenser as in <Example 1>. After that, it was collected on one filter surface of the roll-to-roll dust collector.

In the measurement experiment of the flux removal effect, the number of PCB boards charged was different, and the degree of collection on one surface was measured over the 5th order.

At this time, the intake air volume was set to 3 m ³ / min, which is the same condition as in <Example 1>, and a performance test was conducted for the effect of removing the flux.

Experimental conditions for measuring the effect of removing flux generated from reflow

2 Measurement result of flux removal effect

As shown in Fig. 7, as the number of PCB boards coated with solder paste increases, more and more flux is collected on one filter surface of the roll-to-roll dust collector. ing. In addition, since the flux in the gas-liquid state is condensed in advance by the condenser, it can be seen that the flux is completely collected in the filter.

As in the 5th experiment, even if the amount of solder paste is about 976 gr, the differential pressure is not generated by the filter to which the flux is attached, and the air flow appears well.

It is possible to know that the processing amount of solder paste can be up to 1,000 gr with one filter of the roll-to-roll dust collector, and at the industrial site, one filter can be used for up to 24 hours.

In this way, the roll-to-roll dust collector removes the flux to prevent the flux from adhering to the panel heater in the reflow furnace, so that the flux falls on the PCB plate as shown in FIG. It is possible to prevent the product defect phenomenon that occurs.

<Example 3> (Effect of saving power consumption of reflow)

1 Method of measuring power consumption by applying a heat recovery device

As shown in the schematic diagram of the heat recovery device in FIG. 1, the air purified in real time by the air purification device using the contaminated air discharged from the reflow furnace at a high temperature of about 190 ° C. is 110 by the heat exchanger. After raising the temperature to about ℃, it was recharged inside the reflow furnace to reduce the power consumption of reflow.

At this time, the intake air volume was 3 m ³ / min, which is the same condition as in the industrial field, and the reflow power consumption before and after the application of the heat recovery device was compared and measured for 4 hours using an integrated wattmeter.

2 Measurement result of reflow power consumption

Looking at Fig. 9, the power consumption of the reflow was about 50Kwh before the application of the heat recovery device, but it decreased to 44.6Kwh after the application, and the power of about 5.4Kw decreased for 4 hours. , It shows a saving effect of about 11% of power consumption.

Therefore, if this is converted into a monetary amount, the effect of applying the heat recovery device alone can save about 1,774,000 won per year in electricity costs.

Power Saving (Sun): 1.35Kw x 24hr = 32.4Kwh

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

Power saving (Monday): 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 purification device)

1 Method for measuring the effect of removing volatile organic compounds (VOCs)

A performance test on the removal efficiency of volatile organic compounds was conducted at the Indoor Environmental Analysis Center of Seoul National University.

At this time, a low-temperature plasma reactor of an air purification device was used to set the applied voltage to 15 KV, the air volume to 3 m ³ / min, and the space velocity to 17,000 hr ^-1 , and the decomposition and removal performance test of volatile organic compounds was conducted.

2 Measurement results of volatile organic compound (VOCs) removal effect

The removal efficiency of total volatile organic compounds (Total VOCs) is as follows. In other words, the concentration of total volatile organic compounds in the contaminated air discharged from the reflow furnace is about 77931.3 μg / m ³ , whereas the concentration of total volatile organic compounds is 205.6 μg after passing through the air purification device. It decreases considerably at about / m ³ and shows a high removal efficiency of 99.7%. In particular, 205.6μg / m ³ is the concentration of total volatile organic compound after the air purifier is stopped about half a well below the indoor standard value (500μg / m ^3).

And after the treatment of the air purification device, benzene did not appear at all among the five typical volatile organic compounds, toluene was 18.6 μg / m ³ , ethylbenzene was 10.7 μg / m ³ , and xylene was 13.3. [mu] g / m ^3, styrene is manifested by decreased to about 0.8 [mu] g / m ^3, a representative five volatile organic compounds (benzene, toluene, ethylbenzene, xylene, styrene) are also effectively removed It is possible to know that the value is much lower than the indoor standard value.

Effect of removing volatile organic compounds by air purification device

<Example 5> (Ozone removal effect by metal oxide catalyst)

1 Measurement method of ozone removal effect

After passing through the initial ozone concentration generated by the low temperature plasma reactor of the air purification device and the metal oxide catalyst of the air purification device, the ozone (exhaust ozone) concentration was measured.

At this time, the applied voltage was set to 15 KV, the air volume was set to 3 m ³ / min, and the space velocity was set to 17,000 hr ^-1 with the low temperature plasma reactor of the air purification device, and the ozone concentration was measured.

2 Measurement result of ozone removal effect

The initial ozone concentration generated by the low-temperature plasma reactor is about 40 ppm, but the ozone concentration in the air that is discharged most often after reacting with a metal oxide catalyst and then decomposing the volatile organic compounds is about 40 ppm. It appears at about 0.015ppm and shows an ozone removal efficiency of 99.96%. This is within the acceptable limits for ozone concentrations in South Korea and the United States.

--Korean ozone concentration tolerance: 1 hour average 0.1ppm, 8 hours average 0.06ppm

--US Ozone Concentration Tolerance: 0.1ppm for 8 hours or 40 hours a week, 0.3ppm for 15 minutes

The present invention can be applied to various fields. That is, not only in the electronic and semiconductor markets such as soldering processes, but also in the demand for air purification devices that decompose and deodorize volatile organic compounds, pollutants and malodors emitted from dyeing, printing, painting and plating processes. It is expected to increase to.

The prospects are very inspiring, as the desire for purification facilities in general hospitals or sanatoriums is on the rise as quality of life improves, and in university and laboratory laboratories that use toxic chemicals. And it can also be applied in the washing room of the factory.

In the case of the manufacturing process of electronic parts, productivity can be improved by solving the headache problem caused by the gas generated by ink application.

It can also be applied to the purification treatment of volatile gases such as ammonia and methane generated from pig barns.

It is also very effective in purifying flux, toxic gas, and volatile organic compounds generated when soot and fuel generated by soot from automobiles are burned in tunnels and the like.

At present, smoking cessation facilities are becoming more and more widespread due to the strong government's smoking cessation policy. When applying flux removal technology and air purification technology to smoking booths, not only the odor removal of tobacco smoke but also the efficiency of harmful tobacco smoke components Processing can be performed.

Optimal examples have been disclosed in the drawings and specifications. Although specific terms have been used here, they are used merely for the purpose of explaining the present invention, and are used to limit the meaning and the scope of the present invention described in the claims. It wasn't there. Therefore, it should be understood that a person with ordinary knowledge of the art is capable of various modifications and equivalent other embodiments. Moreover, the true technical protection scope of the present invention is defined by the technical idea of the attached claims.

100: Heat recovery unit
110: Heat exchanger
120, 210: Condenser
122: Heat sink
124: Fan
131, 132: 1st and 2nd non-woven fabric filters
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: Purification department

Claims (11)

In the reflow system
A heat recovery device that recovers high-temperature heat from the contaminated air discharged from the reflow furnace (爐) (10), and the contaminated air that has passed through the heat recovery device is purified in real time and reinjected into the reflow furnace (10). The contaminated air discharged from the heat recovery unit (100) including the first air purification device and the inlet (30) and outlet (40) on both sides of the reflow conveyor (20) is purified in real time and indoors. It is composed of a purification unit (200) including a second air purification device that discharges to (50).
The second air purification device of the purification unit (200) is installed at each of the bonnet portions at both ends of the conveyor (20) in the upper stage of the reflow, includes a condenser (210), and has a medium filter (220) in one kit chamber 3. ), Low temperature plasma reactor (230), or ozone generator, metal oxide catalyst (240), adsorption filter (250), hepa filter (252) and blower (260) are installed in sequence. An integrated reflow system with a built-in heat recovery device and air purification device.
The heat recovery device of the heat recovery unit (100) is composed of a heat exchanger (110) and a condenser (120).
The contaminated air discharged from the reflow furnace (10) is passed through the heat exchanger (110).
After cooling to 80 to 90 ° C, it is cooled to 60 to 70 ° C via the condenser (120), and gas-liquid (gas-liquid) flux is condensed in the contaminated air, and then the first air. The integrated reflow system including a heat recovery device and an air purification device according to claim 1, wherein the system is transferred to a purification device.
The integrated reflow system including a heat recovery device and an air purification device according to claim 2, wherein the condenser (120) includes a heat sink (122) and a fan (124).
In the reflow system
A heat recovery device that recovers high-temperature heat from the contaminated air discharged from the reflow furnace (爐) (10), and the contaminated air that has passed through the heat recovery device is purified in real time and reinjected into the reflow furnace (10). The contaminated air discharged from the heat recovery unit (100) including the first air purification device and the inlet (30) and outlet (40) on both sides of the reflow conveyor (20) is purified in real time and indoors. It is composed of a purification unit (200) including a second air purification device that discharges to (50).
The first air purifying device includes a first non-woven filter (131) for removing condensed flux via a condenser (120), a roll-to-roll dust collector (140), and the roll-to-roll device. The foul odor in the air that has passed through the dust collection filter (142) of the roll dust collector (140) and the foul odor in the air that has passed through the low temperature plasma reactor (150) and the low temperature plasma reactor (150) that remove volatile organic compounds. Medium filters (160) that remove fine dust generated in the process of decomposing volatile organic compounds are sequentially attached to one first kit chamber, and the first kit chamber is pulled out. integrated reflow system with a built-in heat recovery unit and the air purification device you characterized by that mounting is to apply a sliding manner.
The first air purification device includes a metal oxide catalyst (170) that removes residual ozone contained in the air that has passed through the first kit chamber, and air that has passed through the metal oxide catalyst (170). An adsorption filter (180) and a hepa filter (182) that adsorb and remove carbon monoxide and carbon dioxide produced as by-products in the process of decomposing ozone exhaust and volatile organic compounds, and the adsorption filter (180). The heat according to claim 4, wherein the blower (190) for transferring the air passed through the hepafilter (182) to the reflow furnace (10) is sequentially mounted in one second kit chamber. An integrated reflow system with a built-in recovery device and air purification device.
In the first kit chamber, any one of the first non-woven fabric filter (131), the dust collection filter (142) of the roll-to-roll dust collector (140), and the medium filter (160). When the above is replaced, the contaminated air that has passed through the condenser (120) is bypassed (by-pass) to a separate second non-woven fabric filter (132) without passing through the first kit chamber. The integrated reflow system including a heat recovery device and an air purification device according to claim 5, wherein the condensed flux is removed and then transferred to the second kit chamber.
The air purified through the first air purification device and cooled to 65 to 70 ° C. utilizes the contaminated air at 190 ° C. discharged from the reflow furnace (10) to heat the heat exchanger (110). The integrated reflow system incorporating a heat recovery device and an air purification device according to claim 2, wherein the temperature is raised to 110 ° C. and then recharged into the inside of the reflow furnace (10).
The heat recovery unit (100) has a heat exchanger (110), a condenser (120), a metal oxide catalyst (170), an adsorption filter (180), and a HEPA filter (182) in the bonnet portion which is the upper part of the reflow. And blower (190) placed
The first non-woven fabric filter (131), the second non-woven fabric filter (132), the roll-to-roll dust collector (140), the low-temperature plasma reactor (150) and the medium filter (160) are located at the bottom of the reflow. The integrated reflow system including a heat recovery device and an air purification device according to claim 1, wherein the system is characterized by the above.
As the metal oxide catalyst, a single metal oxide or a mixture of metal oxides is used.
The amount of the metal oxide catalyst is 10,000 to 20,000 hr. ^-1 Regulated in the range, the form of the metal oxide catalyst
The integrated reflow system incorporating a heat recovery device and an air purification device according to claim 1 or 5, wherein the system is one of a honeycomb, a pellet, and a corrugate type.
The intake air volume from the heat recovery unit (100) is 1 to 4 m. ³ Adjusted between / min, the intake air volume from the purification unit (200) is 1 to 8 m. ³ The integrated reflow system with a built-in heat recovery device and air purification device according to claim 1, characterized in that it is adjusted between / min.
The volume ratio of the metal oxide catalyst (170) provided in the first air purification device to the adsorption filter (180) is 1: 2, and the metal oxide catalyst (240) provided in the second air purification device. The integrated reflow system incorporating a heat recovery device and an air purification device according to claim 1, wherein the volume ratio of the adsorption filter (250) to the adsorption filter (250) is 2: 1.