CN203564956U - Off-gas processing device in recycling of waste printed circuit boards - Google Patents
Off-gas processing device in recycling of waste printed circuit boards Download PDFInfo
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- CN203564956U CN203564956U CN201320687319.7U CN201320687319U CN203564956U CN 203564956 U CN203564956 U CN 203564956U CN 201320687319 U CN201320687319 U CN 201320687319U CN 203564956 U CN203564956 U CN 203564956U
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Abstract
The utility model discloses an off-gas processing device in recycling of waste printed circuit boards. The off-gas processing device is characterized in that the off-gas to be processed is firstly adsorbed by active carbon so as to filter solid dust, heavy metal particles, part of inorganic nonmetal oxide and part of organic gases in the off-gas; then the pretreated off-gas is aerated into a spray tower to be fully contacted with purifying liquid in the spray tower so as to remove most inorganic nonmetal oxide and part of organic gas in the pretreated gas; finally, the off-gas discharged from the top of the spray tower is aerated into high temperature combustion equipment for burning, and non-polluted off-gas is discharged by combustion process equipment. According to the off-gas processing device, the problem of secondary contamination caused by the off-gas discharged in recycling of waste printed circuit boards is effectively solved; part of the combustible gas components in the off-gas are used, so that certain economic value is realized.
Description
Technical field
The present invention relates to the exhaust gas processing device in a kind of discarded printed circuit boards removal process.
Background technology
Printed circuit board (PCB) (Printed Circuit Board is called for short PCB) is electric equipment products important component part, is widely used in various electronic and electrical equipments.Along with the rapid growth of China's economic, especially manufacturing fast development, the quantity of waste electronic electrical equipment constantly increases, and the recovery of discarded printed circuit boards has become the thorny problem that society faces.
In printed circuit board (PCB) renewable resources removal process, because being distributed with multiple electronic component on it, need first these electronic components to be removed.The most effective electronic component demolition technique of generally acknowledging is at present to adopt someway the solder side of pcb board to heat, and makes to take solder joint that tin-lead alloy is scolder to reach melting temperature and melts; Again the solder side of pcb board is applied the impulsive force of certain way, make the pin of electronic component depart from the pad on PCB, thereby realize the separated of electronic component and PCB substrate.
Printed circuit board (PCB) is normally by non-metallic substrate and metal coating is repressed forms, during electronic component on the condition of high temperature (280-320 ℃) disconnect circuit plate, pcb board itself and the electronic component on it all can produce a large amount of flue gases, its main component comprises a large amount of acid inorganic gas, various organic gas, and the flue dust of heavy metal particles etc.These waste gas are poisonous, harmful, and excitant is large, even carcinogenic, is directly discharged in atmosphere and must causes serious environmental pollution.So, must be through suitable processing to realize safety dumping.
In domestic existing processing discarded printed circuit boards removal process, the apparatus and method of tail gas mainly contain:
1, a kind of exhaust gas processing device and method of extracting glass fibre from waste printed circuit board disclosed in CN102029282A.First, the nonmetallic materials of discarded printed circuit boards are burnt and high temperature thermal decomposition in fluid bed; Then by secondary cyclone, carry out multi-stage separation and obtain glass fibre; Finally, the tail gas that cyclone separator is sent out is transported in high temperature furnace, carries out high-temp combustion and processing.This technology is not just for containing the PCB tabula rasa of electronic component, and its main purpose is to reclaim glass fibre, and only adopts the mode of high-temp combustion can only process flammable organic gas, and can not remove harmful inorganic gas and metal fumes.
2, in CN201267747, disclose a kind of for discarded printed circuit boards being extracted to the liquid dust-removing apparatus of glass fibre tail gas.This device, by tail gas being passed into the fan-shaped disperser being immersed in scavenging solution, increases the contact area of tail gas and scavenging solution, improves the degree of purification of tail gas, and by being placed in the baffle plate backflow scavenging solution of dividing plate top.This technology just extracts for discarded pcb board the tail gas producing in glass fibre process, and only adopts the mode of soaked with liquid can only deposit the part solid particle in tail gas, and can not effectively remove harmful organic gas and very tiny metal fumes.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, exhaust gas processing device in a kind of discarded printed circuit boards removal process is provided, for producing the different characteristics of tail gas in discarded printed circuit boards removal process, rationally use the method for absorption, absorption, dissolving, burning to process the tail gas producing in discarded printed circuit boards removal process, to realize low energy consumption, low cost and high efficiency vent gas treatment.
The present invention is that technical solution problem adopts following technical scheme:
In discarded printed circuit boards removal process of the present invention, the design feature of exhaust gas processing device is:
One spray column is set, and the tail gas ingress pipe being communicated with on spray column lower sidewall port is set, the top blast pipe of connection in spray column top port, is communicated with the scavenging solution ingress pipe on spray column side wall upper part port, and is communicated with the liquid discharge tube on spray column bottom port; Each unit, periphery of spray column is set respectively:
Tail gas imports unit, is that outlet to the described tail gas ingress pipe from described exhaust collection cover sets gradually tail gas air-introduced machine and active carbon adsorption equipment;
Scavenging solution feed unit, is in scavenging solution collection reservoir, to insert scavenging solution delivery line, and described scavenging solution delivery line is connected with described scavenging solution ingress pipe by purifying liquid pump;
Burning processing unit, is, on the blast pipe of described top, top air-introduced machine is set, the outlet access high-temperature combustion equipment of described top air-introduced machine;
Liquids recovery unit, is to access condenser on described liquid discharge tube, the discharging tube access filter of being derived by described condenser, and the filtrate of described filter is recovered in described scavenging solution collection reservoir.
In discarded printed circuit boards removal process of the present invention, the design feature of exhaust gas processing device is also:
Described spray column is the oxide that contains N element or S element for removing tail gas inorganic non-metallic oxide, comprising, also comprises the material that contains Cl or Br halogen.
The throughput that tail gas air-introduced machine and top air-introduced machine are set is 500～10000m
3/ h, blast is 1～100kPa.
The diameter that described active carbon adsorption equipment is set is 100～1000mm, is highly 200～1000mm.
Equally distributed activated carbon granule is housed in described active carbon adsorption equipment, and the diameter of described activated carbon granule is 0.1～20mm, and the micro-pore diameter on activated carbon granule is not less than 20 * 10
-10m.
The scavenging solution being applied in described spray column is OH
-concentration is the strong base solution of 0.1～10mol/L, comprises NaOH solution.
Described filter is multilayer strap or filter bag.
Described high-temperature combustion equipment is for the treatment of comprising: the alkane that contains C, H and O element, olefines material, and benzene class material, phenol type substances, and furans is with bioxin organic matter, temperature in stove is set and is not less than 800 ℃.
In discarded printed circuit boards removal process of the present invention, the feature of exhaust gas treating method is to carry out according to the following procedure:
The first step: first pending tail gas processed through charcoal absorption, the solid dust in filtering tail gas, heavy metal particles, part inorganic non-metallic oxide and part organic gas, discharge pretreatment tail gas;
Second step: described pretreatment tail gas is passed into spray column, pretreatment tail gas is fully contacted with the scavenging solution in spray column, remove most of inorganic non-metallic oxide and a part of organic gas in pretreatment tail gas;
The 3rd step: the tail gas of processing again that spray column top is discharged finally passes into the high-temperature combustion equipment processing of burn, and gives off pollution-free tail gas through the treatment facility that burns.
In the most effective discarded printed circuit boards recovery technology of generally acknowledging at present, the method of disassembling main employing high-temperature heating of waste electronic element, but in the process of heating, the metal part of scolder and electronic component can produce the excitant flue dust of heavy metals such as containing lead, cadmium, mercury, chromium, heavy metal flue dust is incombustible, and is difficult to fast and effeciently dissolved.In addition, the base material of printed circuit board (PCB) is mainly comprised of materials such as resin and glass fibres, when substrate is heated, nonmetallic materials can be decomposed, and discharge irritating flue gas, comprise the oxide containing N, S etc., halogen family material containing Cl, Br etc., and containing C, H, the alkane of O element, hydrocarbon, benzene class material, phenol type substances, furans is with organic matters such as bioxin.These irritating smoke components are very complicated, be difficult for reclaiming, but they contain C, H, O element, can at high temperature burn, and have higher calorific value.Theoretical foundation based on such, the present invention first carries out purified treatment by incombustible solid flue dust and inorganic gas in tail gas by the method for adsorbing and dissolving, more remaining organic gas is passed into high-temperature combustion equipment burns, and reclaims calorific value qualified discharge.Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention concentrates and has processed up hill and dale poisonous and hazardous inorganic gas, the organic gas producing in discarded printed circuit boards heating recovery process, and the flue dust that contains heavy metal particles etc., whole device has been realized environment protection emission, non-secondary pollution.
2, apparatus of the present invention adopt air-introduced machine to collect tail gas, can make harmful flue dust be pumped fast, have guaranteed the cleannes of air in working environment.
3, the present invention adopts active carbon to adsorb solid particle, successful, and the charcoal treatment after saturated is got up economical convenient.
4, the present invention adopts in alkaline scavenging solution and acid inorganic gas, successful, and the alkaline scavenging solution in device can recycle before saturated.
5, the present invention adopts the method for high-temp combustion both can make full use of the flammable organic gas in tail gas, can decompose again the carcinogenic furans of possibility with organic substances such as bioxin.
6, in the present invention, needing active carbon and the alkaline scavenging solution of periodic replacement is all common raw materials of industry, and wide material sources are cheap.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation;
Number in the figure: 1 exhaust collection cover, 2 condensers, 3 tail gas air-introduced machines, 4 liquid discharge tubes, 5 active carbon adsorption equipments, 6 tail gas ingress pipes, 7 spray columns, 8 top blast pipes, 9 top air-introduced machines, 10 discharging tubes, 11 high-temperature combustion equipments, 12 scavenging solution ingress pipes, 13 purify liquid pump, 14 scavenging solution delivery lines, 15 scavenging solution collection reservoir, 16 filters.
The specific embodiment
In the present embodiment, in discarded printed circuit boards removal process, exhaust gas treating method is to carry out according to the following procedure:
The first step: first pending tail gas processed through charcoal absorption, and the solid dust in filtering tail gas (as glass fibre, calcium carbonate etc.), heavy metal particles (as the metallic particles that contains lead, cadmium, mercury, chromium), part inorganic non-metallic oxide are (as NO
2, SO
2deng) and part organic gas (as acetone, phenol etc.), discharge pretreatment tail gas;
In the present embodiment, exhaust collection cover 1 can be connected to the tail gas exhaust outlet of discarded printed circuit boards reclaimer, or is directly placed on molten tin equipment, farthest reduces and escapes into the Tail Gas in environment; Then, by the tail gas air-introduced machine 3 being placed in before absorbent charcoal adsorber, collect the tail gas that removal process produces, increase the contact probability of tail gas and active carbon, accelerate adsorption rate.
Second step: pretreatment tail gas is passed into spray column, pretreatment tail gas is fully contacted with the scavenging solution in spray column, in removal pretreatment tail gas, most of inorganic non-metallic oxide is (as NO
2, SO
2deng) and a part of organic gas (as phenol);
In the present embodiment, pretreatment tail gas is introduced spray columns by tail gas ingress pipe 6, and tail gas carries out gas-liquid two-phase with alkaline scavenging solution and fully contacts, and neutralization reaction occurs, and tail gas is after purifying, then through 8 discharges of top blast pipe; Scavenging solution after purifying liquid pump supercharging at tower top spray and under, be finally back to scavenging solution collection reservoir, after filter 16 filters, recycle, the pressure, the flow that purify liquid pump can regulate according to working condition.
The 3rd step: the tail gas of processing again that spray column top is discharged finally passes into high-temperature combustion equipment processings of burn, and gives off pollution-free tail gas through the processing of burning.
In the present embodiment, high-temperature combustion equipment can be converter, kiln or other special tail gas high-temperature processing device, temperature in stove is set and should be not less than 800 ℃, gas through high-temperature combustion equipment burning is alkane, the olefines material that contains C, H and O element, benzene class material, phenol type substances, and furans is with organic matters such as bioxin, be characterized in complicated component, but incendivity, and calorific value is high; Finally, the gas that is met discharge standard by high-temperature combustion equipment discharge.
Referring to Fig. 1, in the present embodiment, in discarded printed circuit boards removal process, the version of exhaust gas processing device is:
One spray column 7 is set, and the tail gas ingress pipe 6 being communicated with on spray column lower sidewall port is set, the top blast pipe 8 of connection in spray column top port, the scavenging solution ingress pipe 12 of connection on spray column side wall upper part port, and be communicated with the liquid discharge tube 4 on spray column bottom port; Each unit, periphery of spray column 7 is set respectively:
Tail gas imports unit, is that outlet to the tail gas ingress pipe 6 from exhaust collection cover 1 sets gradually tail gas air-introduced machine 3 and active carbon adsorption equipment 5;
Scavenging solution feed unit, is in scavenging solution collection reservoir 15, to insert scavenging solution delivery line 14, and scavenging solution delivery line 14 is connected with scavenging solution ingress pipe 12 by purifying liquid pump 13;
Burning processing unit, is that top air-introduced machine 9 is set on top blast pipe 8, the outlet access high-temperature combustion equipment 11 of top air-introduced machine 9;
Liquids recovery unit, is on liquid discharge tube 4, to access condenser 2, the discharging tube 10 access filters 16 of being derived by condenser 2, and the filtrate of filter 16 is recovered in scavenging solution collection reservoir 15.
In concrete enforcement, corresponding setting also comprises:
Spray column is for removing tail gas inorganic non-metallic oxide, comprise the oxide that contains N element or S element, also comprise the material that contains Cl or Br halogen, there is neutralization reaction in scavenging solution and inorganic non-metallic oxide and halogen material in spray column.
The throughput that tail gas air-introduced machine 3 and top air-introduced machine 9 are set is 500～10000m
3/ h, blast is 1～100kPa; The throughput of air-introduced machine and blast can carry out suitable adjustment according to condition of work.
The diameter that active carbon adsorption equipment 5 is set is 100～1000mm, is highly 200～1000mm; The large I of active carbon adsorption equipment 5 is carried out suitable adjustment according to condition of work.
Equally distributed activated carbon granule is housed in active carbon adsorption equipment 5, and the diameter of activated carbon granule is 0.1～20mm, and the micro-pore diameter on charcoal particle is not less than 20 * 10
-10m, to improve the adsorption efficiency to tail gas.
The scavenging solution being applied in spray column 7 is OH
-concentration is the strong base solution of 0.1～10mol/L, comprises NaOH solution; In scavenging solution cyclic process, regulate condenser 2, prevent scavenging solution excess Temperature.
High-temperature combustion equipment 11 can be converter, kiln or other special tail gas high-temperature processing device, for the treatment of comprising: the alkane that contains C, H and O element, olefines material, benzene class material, phenol type substances, and furans is with organic matters such as bioxin, temperature in stove is set and is not less than 800 ℃.
In order to keep the validity of whole device, the scavenging solution using in activated carbon granule and spray column needs periodic replacement.
Claims (6)
1. an exhaust gas processing device in discarded printed circuit boards removal process, is characterized in that:
One spray column (7) is set, and the tail gas ingress pipe (6) being communicated with on spray column lower sidewall port is set, the top blast pipe (8) of connection in spray column top port, the scavenging solution ingress pipe (12) of connection on spray column side wall upper part port, and be communicated with the liquid discharge tube (4) on spray column bottom port; Each unit, periphery of spray column (7) is set respectively:
Tail gas imports unit, is that outlet to the described tail gas ingress pipe (6) from described exhaust collection cover (1) sets gradually tail gas air-introduced machine (3) and active carbon adsorption equipment (5);
Scavenging solution feed unit, is in scavenging solution collection reservoir (15), to insert scavenging solution delivery line (14), and described scavenging solution delivery line (14) is connected with described scavenging solution ingress pipe (12) by purifying liquid pump (13);
Burning processing unit, is that top air-introduced machine (9) is set on described top blast pipe (8), the outlet access high-temperature combustion equipment (11) of described top air-introduced machine (9);
Liquids recovery unit, at the upper access of described liquid discharge tube (4) condenser (2), discharging tube (10) the access filter (16) of being derived by described condenser (2), the filtrate of described filter (16) is recovered in described scavenging solution collection reservoir (15).
2. exhaust gas processing device in discarded printed circuit boards removal process according to claim 1, is characterized in that: the throughput that tail gas air-introduced machine (3) and top air-introduced machine (9) are set is 500～10000m
3/ h, blast is 1～100kPa.
3. exhaust gas processing device in discarded printed circuit boards removal process according to claim 1, is characterized in that: the diameter that described active carbon adsorption equipment (5) is set is 100～1000mm, is highly 200～1000mm.
4. exhaust gas processing device in discarded printed circuit boards removal process according to claim 3, it is characterized in that: described active carbon adsorption equipment is equipped with equally distributed activated carbon granule in (5), the diameter of described activated carbon granule is 0.1～20mm, and the micro-pore diameter on activated carbon granule is not less than 20 * 10
-10m.
5. exhaust gas processing device in discarded printed circuit boards removal process according to claim 1, is characterized in that: described filter (16) is multilayer strap or filter bag.
6. exhaust gas processing device in discarded printed circuit boards removal process according to claim 1, it is characterized in that: described high-temperature combustion equipment (11) is for the treatment of comprising: the alkane that contains C, H and O element, olefines material, benzene class material, phenol type substances, and furans is with bioxin organic matter, temperature in stove is set and is not less than 800 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320687319.7U CN203564956U (en) | 2013-11-01 | 2013-11-01 | Off-gas processing device in recycling of waste printed circuit boards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320687319.7U CN203564956U (en) | 2013-11-01 | 2013-11-01 | Off-gas processing device in recycling of waste printed circuit boards |
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| Publication Number | Publication Date |
|---|---|
| CN203564956U true CN203564956U (en) | 2014-04-30 |
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|---|---|---|---|
| CN201320687319.7U Expired - Fee Related CN203564956U (en) | 2013-11-01 | 2013-11-01 | Off-gas processing device in recycling of waste printed circuit boards |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537181A (en) * | 2013-11-01 | 2014-01-29 | 合肥工业大学 | Tail gas treatment device and tail gas treatment method in process of recycling waste printed circuit boards |
| CN109772139A (en) * | 2019-03-07 | 2019-05-21 | 大同新成新材料股份有限公司 | A kind of active carbon desulfurization denitration dust collecting device |
-
2013
- 2013-11-01 CN CN201320687319.7U patent/CN203564956U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537181A (en) * | 2013-11-01 | 2014-01-29 | 合肥工业大学 | Tail gas treatment device and tail gas treatment method in process of recycling waste printed circuit boards |
| CN109772139A (en) * | 2019-03-07 | 2019-05-21 | 大同新成新材料股份有限公司 | A kind of active carbon desulfurization denitration dust collecting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20181101 |