CN206051566U - The system that a kind of Waste ammunition is processed - Google Patents
The system that a kind of Waste ammunition is processed Download PDFInfo
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- CN206051566U CN206051566U CN201620972163.0U CN201620972163U CN206051566U CN 206051566 U CN206051566 U CN 206051566U CN 201620972163 U CN201620972163 U CN 201620972163U CN 206051566 U CN206051566 U CN 206051566U
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- 239000002699 waste material Substances 0.000 title claims abstract description 31
- 238000000197 pyrolysis Methods 0.000 claims abstract description 151
- 238000000926 separation method Methods 0.000 claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000005997 Calcium carbide Substances 0.000 claims description 86
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 86
- 239000000126 substance Substances 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 33
- 229910052799 carbon Inorganic materials 0.000 claims description 33
- 229910052755 nonmetal Inorganic materials 0.000 claims description 32
- 238000000746 purification Methods 0.000 claims description 32
- 239000007787 solid Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 8
- 238000007885 magnetic separation Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 239000007800 oxidant agent Substances 0.000 claims 2
- 230000001590 oxidative effect Effects 0.000 claims 2
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- 239000000047 product Substances 0.000 description 127
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 14
- 229910002091 carbon monoxide Inorganic materials 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 14
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- 239000001257 hydrogen Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
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- 238000001816 cooling Methods 0.000 description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 8
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- 239000000446 fuel Substances 0.000 description 7
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- 239000000295 fuel oil Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
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- 230000002378 acidificating effect Effects 0.000 description 5
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- 239000001569 carbon dioxide Substances 0.000 description 4
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 229920000915 polyvinyl chloride Polymers 0.000 description 2
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- 239000002893 slag Substances 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
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- 238000005485 electric heating Methods 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
This utility model discloses the system that a kind of Waste ammunition is processed.The system includes：Pretreatment unit, separative element, mixed cell, pyrolysis unit, Oil-gas Separation clean unit and carbide production unit.Pretreatment unit, separative element, mixed cell, pyrolysis unit and carbide production unit are sequentially connected, and Oil-gas Separation clean unit connects pyrolysis unit and carbide production unit.The recovery of Waste ammunition and carbide production coupling are realized that the resource of Waste ammunition is recycled and reduces carbide production cost by the system that this utility model is provided.
Description
Technical Field
The utility model belongs to solid waste resourceful treatment field especially relates to a system that old and useless electronic product handled.
Background
With the rapid development of science and technology, waste electronic products and leftover materials formed in the processing process of the electronic products are increasing day by day. Annual yields of electronic waste in developed countries such as japan, the usa and the european union account for 1%, 2-5% and 4% of municipal waste, respectively, and increase at a rate of 16% -28% per 5 years, which is 3-5 times the rate of municipal waste growth. The situation is particularly serious in China, the population of China is large, and the China is also a main place for dumping electronic garbage in developed countries, data shows that 80% of electronic garbage in the United states is exported to Asia, and 90% of the electronic garbage enters China.
The technology for recycling and treating the waste circuit boards at home and abroad mainly comprises a mechanical physical separation method, a hydrometallurgy technology, a biological metallurgy technology and a pyrolysis technology, and most of the technologies pay attention to recycling metal in the waste printed circuit boards except for pyrolysis. The mechanical physical separation method is easy to scale, relatively causes little pollution to the environment, but various metals cannot be thoroughly separated, and the residual organic matters are buried or burned, so that resources are wasted and the environmental pollution is serious; the metal recovery rate of hydrometallurgy is high, but the consumption of chemical reagents is large, the process is complex, and the high molecular organic compounds in the circuit board are not recycled; the biological metallurgy technology is still in the research stage at present, and suitable bacteria are few and are difficult to culture; in comparison, through the combination of pyrolysis technology pyrolysis and physical separation methods, the metal in the waste electronic products can be effectively recovered, and the high molecular organic materials in the waste electronic products can be utilized to decompose the metal into fuel oil, fuel gas and carbide.
The chemical name of calcium carbide, colorless crystal, is mainly used for producing acetylene gas, and has been called as the mother material of organic synthesis industry. Acetylene is an important chemical raw material and is mainly used for producing polyvinyl chloride and vinyl acetate products, 70 percent of the raw material acetylene for producing PVC products in China is from calcium carbide, the calcium carbide has very important effect on the economic development of China, the yield is continuously increased in more than ten years, and the yield reaches over 2200 million tons in 2013.
The production process of calcium carbide mainly comprises an electric heating method and an oxygen heating method.
In addition, because the heat release amount of the unit carbon-containing fuel in incomplete combustion is small, a large amount of carbon-containing fuel needs to be combusted to supply heat, more ash is generated and is enriched into a calcium carbide product, and the quality of the calcium carbide product is greatly influenced. How to reduce the production cost of calcium carbide and increase the income of calcium carbide enterprises becomes one of the development problems of the calcium carbide industry in China.
At present, a simple pyrolysis method is generally adopted for treating waste electronic products, a method for recovering metals after pyrolysis is provided, but the method neglects the utilization of pyrolysis gas, pyrolysis carbon and other products in the pyrolysis process, does not achieve the maximization of resource utilization, and simultaneously, the vacuum pyrolysis has high requirements on equipment, so that the industrialization is difficult to realize.
As can be seen from the above, the following problems exist in the prior art: the recycling level of the non-metallic substances is not enough in the waste electronic product treatment; pyrolysis treatment of waste electronic products is mostly used as a pretreatment means, and subsequent utilization technology of pyrolysis products is lacked; the production of calcium carbide needs a large amount of coke and heat energy/electric energy, and has high raw material cost and high energy consumption; the ash after the combustion by the oxygen thermal method is enriched in the calcium carbide product, and the quality of the calcium carbide product is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses aim at being in the same place the resourceful recovery processing and the carbide production technology coupling of old and useless electronic product to utilize the pyrolysis gas that the old and useless electronic product of pyrolysis produced to provide the heat for carbide production, realize the resourceful recycle to old and useless electronic product simultaneously and reduce carbide manufacturing cost and reduce the purpose of carbide ash content.
In order to achieve the above object, the utility model provides a system for old and useless electronic product handles, this system includes: a pretreatment unit, a separation unit, a mixing unit, a pyrolysis unit, an oil-gas separation and purification unit and a calcium carbide production unit,
the pretreatment unit comprises a disassembly unit and a crushing unit, the disassembly unit comprises a waste electronic product inlet and a disassembly product outlet, the crushing unit comprises a disassembly product inlet and a pretreatment product outlet, and the disassembly product inlet is connected with the disassembly product outlet;
the separation unit comprises a pretreatment product inlet and a nonmetal product outlet, and the pretreatment product inlet is connected with the pretreatment product outlet;
the mixing unit comprises a non-metal product inlet, a calcium-based raw material inlet and a mixed product outlet, and the non-metal product inlet is connected with the non-metal product outlet;
the pyrolysis unit comprises a mixed product inlet, a solid carbon-containing substance outlet and a high-temperature oil gas outlet, and the mixed product inlet is connected with the mixed product outlet;
the oil-gas separation and purification unit comprises a high-temperature oil-gas inlet and a pyrolysis gas outlet, and the high-temperature oil-gas inlet is connected with the high-temperature oil-gas outlet;
the calcium carbide production unit comprises a pyrolysis gas inlet, a solid carbon-containing substance inlet and a calcium carbide product outlet, wherein the pyrolysis gas inlet is connected with the pyrolysis gas outlet, and the solid carbon-containing substance inlet is connected with the solid carbon-containing substance outlet.
Specifically, the separation unit is one or a combination of an air separation unit, a magnetic separation unit or an electrostatic separation unit; and a sealed discharging device is arranged at the solid carbon-containing substance outlet.
Further, the calcium carbide production unit comprises a calcium carbide tail gas outlet; the system further comprises a gas purification and dust removal unit, wherein the gas purification and dust removal unit comprises a calcium carbide tail gas inlet, and the calcium carbide tail gas inlet is connected with the calcium carbide tail gas outlet.
Furthermore, the calcium carbide production unit also comprises a combustion-supporting gas inlet, and combustion-supporting gas is introduced into the auxiliary pyrolysis gas through the combustion-supporting gas inlet for combustion; the oil-gas separation and purification unit further comprises a pyrolysis oil outlet.
Utilize the above-mentioned system of the utility model, through the resourceful recovery processing and the carbide production technology coupling with old and useless electronic product together to utilize old and useless electronic product pyrolysis gas to provide the heat for carbide production, the utility model discloses following effect has been obtained:
(1) the clean and efficient resource treatment of waste electronic products is realized;
(2) the high-value utilization of the pyrolysis products of the waste electronic products is realized;
(3) the yield of pyrolysis products is improved;
(4) the raw materials with low price can be used, so that the cost of the raw materials for calcium carbide production is reduced;
(5) the byproduct pyrolysis gas is burnt to be used as a supplementary heat source for calcium carbide generation, so that the power consumption is reduced;
(6) the pyrolysis solid product is thermally sent into a calcium carbide furnace, so that the heating energy consumption is reduced;
(7) the combustion pyrolysis gas has no ash content and has no influence on the quality of the calcium carbide product.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a system for processing waste electronic products according to the present invention.
Fig. 2 is a process flow diagram of the waste electronic product treatment of the present invention.
Detailed Description
The invention will be described in more detail with reference to the following figures and examples, so that the aspects and advantages of the invention can be better understood. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit the present invention.
In one aspect of the utility model, the utility model provides a system for old and useless electronic product handles, this system include pretreatment unit, separation element, mixing unit, pyrolysis unit, oil-gas separation purification unit and carbide production unit:
a, pretreatment: disassembling and crushing the waste electronic products in the pretreatment unit to obtain a pretreatment product;
b, separation: performing one or more of fine crushing, air separation, magnetic separation and electrostatic separation on the pretreated product to obtain a non-metal product, wherein the particle size of the non-metal product is controlled to be 0.5-100 mm;
c, mixing: mixing the non-metal product with calcium-based raw materials (one or a mixture of lime, limestone, hydrated lime or carbide slag) to obtain a mixed product;
d, pyrolysis: feeding the mixed product into the pyrolysis unit for pyrolysis reaction, uniformly feeding the mixed product into a pyrolysis furnace for pyrolysis reaction, wherein the pyrolysis temperature is 450-;
e, oil-gas separation and purification: and the high-temperature oil gas collected in the pyrolysis unit enters a separation and purification unit, and the separation and purification comprises one or more of direct cooling, indirect cooling, halogen and other acidic harmful gas removal, electric tar capture, desulfurization and oil-water separation, so that clean pyrolysis gas and pyrolysis oil are obtained. The pyrolysis gas is collected and sent into a carbide production unit, the yield of the pyrolysis gas is 10% -20%, and the pyrolysis gas is rich in hydrogen, methane, carbon monoxide and the like and can be directly combusted to supply heat. The pyrolysis oil is collected and sold as fuel oil or chemical products, and the yield of the pyrolysis oil is 10-25%;
f, calcium carbide production: because the nonmetal in the waste electronic products is mostly high molecular organic materials such as epoxy resin and the like, the pyrolyzed solid carbonaceous material has low ash content and high fixed carbon content, and is suitable for being used as a carbon-based raw material for calcium carbide production, and meanwhile, the premixed calcium-based raw material can realize direct hot charging of the carbonaceous material into a calcium carbide furnace, and the hot charging temperature of the solid carbonaceous material is 350-750 ℃. The calcium carbide furnace adopts a combination of a plurality of electrodes and a plurality of burners to provide a heat source for calcium carbide raw materials. The combustor is used as a supplementary heat source of the electrode, the fuel is pyrolysis gas from the oil-gas separation and purification unit, supplementary combustion-supporting gas is combusted, the pyrolysis gas is rich in hydrogen, methane and carbon monoxide, combustion products are ash-free, and the quality of calcium carbide products cannot be reduced. The temperature of the calcium carbide furnace is 1700-.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
This embodiment provides a system that old and useless electronic product handled, this system includes pretreatment unit, separation unit, mixing unit, pyrolysis unit, oil-gas separation purification unit and carbide production unit:
a, pretreatment: and in the pretreatment unit, the waste electronic products are disassembled and crushed to obtain a pretreatment product.
B, separation: and (3) subjecting the pretreated product to one or more of fine crushing, air separation, magnetic separation and electrostatic separation to obtain a nonmetal product, wherein the particle size of the nonmetal product is controlled to be 50mm, and the content of nonmetal organic matters is 37%. The industrial analysis of non-metal organics is as follows:
TABLE 1 Industrial analysis of non-metallic organic substances sorted
C, mixing: and mixing the nonmetal product with lime to obtain a mixed product.
D, pyrolysis: and feeding the mixed product into the pyrolysis unit to perform pyrolysis reaction, uniformly feeding the mixed product into a pyrolysis furnace to perform pyrolysis reaction, wherein the pyrolysis temperature is 450 ℃, the pyrolysis time is 3 hours, high-temperature oil gas and solid carbon-containing substances are generated after the pyrolysis reaction is completed, the high-temperature oil gas is collected through an oil gas pipeline arranged in the pyrolysis furnace, and the solid carbon-containing substances are discharged through a sealed discharging device.
E, oil-gas separation and purification: the high-temperature oil gas collected in the pyrolysis unit enters a separation and purification unit, is separated into non-condensable gas and condensable liquid through direct cooling, the non-condensable gas is subjected to alkali washing to remove acidic harmful gases such as halogen and the like, and the pyrolysis gas is obtained after electric coking. The condensable liquid enters an oil-water separation tank to obtain pyrolysis oil, and the separated pyrolysis water is partially recycled as direct cooling spray. The pyrolysis gas is collected and sent into a carbide production unit, the yield of the pyrolysis gas is 15%, and the pyrolysis gas is rich in hydrogen, methane, carbon monoxide and the like and can be directly combusted to supply heat. The pyrolysis oil is collected and sold as fuel oil or chemical products, and the yield of the pyrolysis oil is 22%. The content of the pyrolysis gas is as follows:
TABLE 2 pyrolysis gas composition and heating value
| Hydrogen/%) | Methane/% | Carbon monoxide/%) | Carbon dioxide/%) | CnHm/％ | Calorific value kcal/Nm3 |
| 41.21 | 10.05 | 13.91 | 33.02 | 1.81 | 2451 |
F, calcium carbide production: directly hot charging solid carbon-containing substances into the calcium carbide furnace, wherein the hot feeding temperature of the solid carbon-containing substances is 550 ℃. The calcium carbide furnace adopts a combination of a plurality of electrodes and a plurality of burners to provide a heat source for calcium carbide raw materials. The combustor is used as a supplementary heat source of the electrode, the fuel is pyrolysis gas from the oil-gas separation and purification unit, supplementary combustion-supporting gas is combusted, the pyrolysis gas is rich in hydrogen, methane and carbon monoxide, combustion products are ash-free, and the quality of calcium carbide products cannot be reduced. The temperature of the calcium carbide furnace is 2200 ℃, the reaction time is 20min, the calcium carbide tail gas enters the gas purification and dust removal unit, and the calcium carbide product is discharged from a discharge hole, wherein the content of calcium carbide in the calcium carbide product is 80.66 percent, and the gas evolution quantity is 302L/kg.
Example 2
This example is the same as the system used in example 1 above, but with different process conditions, as follows:
a, pretreatment: and in the pretreatment unit, the waste electronic products are disassembled and crushed to obtain a pretreatment product.
B, separation: and (3) subjecting the pretreated product to one or more of fine crushing, air separation, magnetic separation and electrostatic separation to obtain a nonmetal product, wherein the particle size of the nonmetal product is controlled to be 0.5mm, and the content of nonmetal organic matters is 46%. The industrial analysis of non-metal organics is as follows:
TABLE 3 Industrial analysis of non-metallic organic substances sorted
| Item | Unit of | Numerical value | Remarks for note |
| Moisture content | wt％ | 0.43 | Received base |
| Fixed carbon | wt％ | 20.73 | Received base |
| Volatile component | wt％ | 75.2 | Received base |
| Ash content | wt％ | 3.64 | Received base |
C, mixing: and mixing the nonmetal product with hydrated lime to obtain a mixed product.
D, pyrolysis: and feeding the mixed product into the pyrolysis unit to perform pyrolysis reaction, uniformly feeding the mixed product into a pyrolysis furnace to perform pyrolysis reaction, wherein the pyrolysis temperature is 650 ℃, the pyrolysis time is 1.5h, high-temperature oil gas and solid carbon-containing substances are generated after the pyrolysis reaction is completed, the high-temperature oil gas is collected through an oil gas pipeline arranged in the pyrolysis furnace, and the solid carbon-containing substances are discharged through a sealed discharging device.
E, oil-gas separation and purification: the high-temperature oil gas collected in the pyrolysis unit enters a separation and purification unit, is separated into non-condensable gas and condensable liquid through direct cooling, the non-condensable gas is subjected to alkali washing to remove acidic harmful gases such as halogen and the like, and the pyrolysis gas is obtained after electric coking. The condensable liquid enters an oil-water separation tank to obtain pyrolysis oil, and the separated pyrolysis water is partially recycled as direct cooling spray. The pyrolysis gas is collected and sent into a carbide production unit, the yield of the pyrolysis gas is 18 percent, and the pyrolysis gas is rich in hydrogen, methane, carbon monoxide and the like and can be directly combusted to supply heat. The pyrolysis oil is collected and sold as fuel oil or chemical products, and the yield of the pyrolysis oil is 16%. The content of the pyrolysis gas is as follows:
TABLE 4 pyrolysis gas composition and heating value
| Hydrogen/%) | Methane/% | Carbon monoxide/%) | Carbon dioxide/%) | CnHm/％ | Calorific value kcal/Nm3 |
| 42.41 | 9.35 | 14.19 | 32.51 | 1.42 | 2390 |
F, calcium carbide production: directly hot charging solid carbon-containing substances into the calcium carbide furnace, wherein the hot feeding temperature of the solid carbon-containing substances is 750 ℃. The calcium carbide furnace adopts a combination of a plurality of electrodes and a plurality of burners to provide a heat source for calcium carbide raw materials. The combustor is used as a supplementary heat source of the electrode, the fuel is pyrolysis gas from the oil-gas separation and purification unit, supplementary combustion-supporting gas is combusted, the pyrolysis gas is rich in hydrogen, methane and carbon monoxide, combustion products are ash-free, and the quality of calcium carbide products cannot be reduced. The temperature of the calcium carbide furnace is 2000 ℃, the reaction time is 5min, the calcium carbide tail gas enters the gas purification and dust removal unit, the calcium carbide product is discharged from the discharge hole, the calcium carbide content in the calcium carbide product is 79.32%, and the gas evolution quantity is 301L/kg.
Example 3
This example is the same as the system used in example 1 above, but with different process conditions, as follows:
a, pretreatment: and in the pretreatment unit, the waste electronic products are disassembled and crushed to obtain a pretreatment product.
B, separation: and (3) subjecting the pretreated product to one or more of fine crushing, air separation, magnetic separation and electrostatic separation to obtain a nonmetal product, wherein the particle size of the nonmetal product is controlled to be 100mm, and the content of nonmetal organic matters is 35%. The industrial analysis of non-metal organics is as follows:
TABLE 5 Industrial analysis of non-metallic organic substances sorted
| Item | Unit of | Numerical value | Remarks for note |
| Moisture content | wt％ | 0.39 | Received base |
| Fixed carbon | wt％ | 19.23 | Received base |
| Volatile component | wt％ | 76.21 | Received base |
| Ash content | wt％ | 4.17 | Received base |
C, mixing: and mixing the nonmetal product with limestone to obtain a mixed product.
D, pyrolysis: and feeding the mixed product into the pyrolysis unit to perform pyrolysis reaction, uniformly feeding the mixed product into a pyrolysis furnace to perform pyrolysis reaction, wherein the pyrolysis temperature is 850 ℃, the pyrolysis time is 0.5h, high-temperature oil gas and solid carbon-containing substances are generated after the pyrolysis reaction is completed, the high-temperature oil gas is collected through an oil gas pipeline arranged in the pyrolysis furnace, and the solid carbon-containing substances are discharged through a sealed discharging device.
E, oil-gas separation and purification: the high-temperature oil gas collected in the pyrolysis unit enters a separation and purification unit, is separated into non-condensable gas and condensable liquid through direct cooling, the non-condensable gas is subjected to alkali washing to remove acidic harmful gases such as halogen and the like, and the pyrolysis gas is obtained after electric coking. The condensable liquid enters an oil-water separation tank to obtain pyrolysis oil, and the separated pyrolysis water is partially recycled as direct cooling spray. The pyrolysis gas is collected and sent into a carbide production unit, the yield of the pyrolysis gas is 16 percent, and the pyrolysis gas is rich in hydrogen, methane, carbon monoxide and the like and can be directly combusted to supply heat. The pyrolysis oil is collected and sold as fuel oil or chemical products, and the yield of the pyrolysis oil is 20%. The content of the pyrolysis gas is as follows:
TABLE 6 pyrolysis gas composition and heating value
| Hydrogen/%) | Methane/% | Carbon monoxide/%) | Carbon dioxide/%) | CnHm/％ | Calorific value kcal/Nm3 |
| 42.07 | 10.01 | 14.22 | 31.59 | 1.38 | 2426 |
F, calcium carbide production: directly hot charging solid carbon-containing substances into the calcium carbide furnace, wherein the hot feeding temperature of the solid carbon-containing substances is 350 ℃. The calcium carbide furnace adopts a combination of a plurality of electrodes and a plurality of burners to provide a heat source for calcium carbide raw materials. The combustor is used as a supplementary heat source of the electrode, the fuel is pyrolysis gas from the oil-gas separation and purification unit, supplementary combustion-supporting gas is combusted, the pyrolysis gas is rich in hydrogen, methane and carbon monoxide, combustion products are ash-free, and the quality of calcium carbide products cannot be reduced. The temperature of the calcium carbide furnace is 1700 ℃, the reaction time is 50min, the calcium carbide tail gas enters the gas purification and dust removal unit, and the calcium carbide product is discharged from the discharge hole, wherein the content of calcium carbide in the calcium carbide product is 81.21 percent, and the gas evolution is 298L/kg.
Example 4
This example is the same as the system used in example 1 above, but with different process conditions, as follows:
a, pretreatment: and in the pretreatment unit, the waste electronic products are disassembled and crushed to obtain a pretreatment product.
B, separation: and (3) subjecting the pretreated product to one or more of fine crushing, air separation, magnetic separation and electrostatic separation to obtain a nonmetal product, wherein the particle size of the nonmetal product is controlled to be 20mm, and the content of nonmetal organic matters is 44%. The industrial analysis of non-metal organics is as follows:
TABLE 7 Industrial analysis of non-metallic organic substances sorted
| Item | Unit of | Numerical value | Remarks for note |
| Moisture content | wt％ | 0.36 | Received base |
| Fixed carbon | wt％ | 19.77 | Received base |
| Volatile component | wt％ | 76.11 | Received base |
| Ash content | wt％ | 3.76 | Received base |
C, mixing: and mixing the non-metal product with the carbide slag to obtain a mixed product.
D, pyrolysis: and feeding the mixed product into the pyrolysis unit to perform pyrolysis reaction, uniformly feeding the mixed product into a pyrolysis furnace to perform pyrolysis reaction, wherein the pyrolysis temperature is 750 ℃, the pyrolysis time is 2 hours, high-temperature oil gas and solid carbon-containing substances are generated after the pyrolysis reaction is completed, the high-temperature oil gas is collected through an oil gas pipeline arranged in the pyrolysis furnace, and the solid carbon-containing substances are discharged through a sealed discharging device.
E, oil-gas separation and purification: the high-temperature oil gas collected in the pyrolysis unit enters a separation and purification unit, is separated into non-condensable gas and condensable liquid through direct cooling, the non-condensable gas is subjected to alkali washing to remove acidic harmful gases such as halogen and the like, and the pyrolysis gas is obtained after electric coking. The condensable liquid enters an oil-water separation tank to obtain pyrolysis oil, and the separated pyrolysis water is partially recycled as direct cooling spray. The pyrolysis gas is collected and sent into a carbide production unit, the yield of the pyrolysis gas is 20 percent, and the pyrolysis gas is rich in hydrogen, methane, carbon monoxide and the like and can be directly combusted to supply heat. The pyrolysis oil is collected and sold as fuel oil or chemical products, and the yield of the pyrolysis oil is 22%. The content of the pyrolysis gas is as follows:
TABLE 8 pyrolysis gas composition and heating value
| Hydrogen/%) | Methane/% | Carbon monoxide/%) | Carbon dioxide/%) | CnHm/％ | Calorific value kcal/Nm3 |
| 41.09 | 11.12 | 13.32 | 32.01 | 1.27 | 2431 |
F, calcium carbide production: directly hot charging solid carbon-containing substances into the calcium carbide furnace, wherein the hot feeding temperature of the solid carbon-containing substances is 550 ℃. The calcium carbide furnace adopts a combination of a plurality of electrodes and a plurality of burners to provide a heat source for calcium carbide raw materials. The combustor is used as a supplementary heat source of the electrode, the fuel is pyrolysis gas from the oil-gas separation and purification unit, supplementary combustion-supporting gas is combusted, the pyrolysis gas is rich in hydrogen, methane and carbon monoxide, combustion products are ash-free, and the quality of calcium carbide products cannot be reduced. The temperature of the calcium carbide furnace is 1800 ℃, the reaction time is 30min, the calcium carbide tail gas enters the gas purification and dust removal unit, the calcium carbide product is discharged from the calcium carbide product discharge port, the calcium carbide content in the calcium carbide product is 80.13%, and the gas evolution quantity is 300L/kg.
As can be seen from the above embodiment, the utility model realizes the clean and efficient resource treatment of the waste electronic products and the high-value utilization of the pyrolysis products of the waste electronic products; the yield of pyrolysis oil gas products is improved; the raw materials with low price can be used, so that the cost of the raw materials for calcium carbide production is reduced; the byproduct pyrolysis gas is burnt to be used as a supplementary heat source for calcium carbide generation, so that the power consumption is reduced; the pyrolysis solid product is thermally sent into a calcium carbide furnace, so that the heating energy consumption is reduced; the combustion pyrolysis gas has no ash content, and has no influence on the quality of the calcium carbide product; the waste electronic product pyrolysis oil has good oil product and high economy, and the process economic benefit is improved by selling the pyrolysis oil.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
The disclosure of the present application is directed to exemplary embodiments, and various changes and modifications may be made in the various embodiments of the present application without departing from the scope of the invention as defined in the appended claims. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (6)
1. A system for processing waste electronic products comprises a pretreatment unit, a separation unit, a mixing unit, a pyrolysis unit, an oil-gas separation and purification unit and a calcium carbide production unit; wherein,
the pretreatment unit comprises a disassembly unit and a crushing unit, the disassembly unit comprises a waste electronic product inlet and a disassembly product outlet, the crushing unit comprises a disassembly product inlet and a pretreatment product outlet, and the disassembly product inlet is connected with the disassembly product outlet;
the separation unit comprises a pretreatment product inlet and a nonmetal product outlet, and the pretreatment product inlet is connected with the pretreatment product outlet;
the mixing unit comprises a non-metal product inlet, a calcium-based raw material inlet and a mixed product outlet, and the non-metal product inlet is connected with the non-metal product outlet;
the pyrolysis unit comprises a mixed product inlet, a solid carbon-containing substance outlet and a high-temperature oil gas outlet, and the mixed product inlet is connected with the mixed product outlet;
the oil-gas separation and purification unit comprises a high-temperature oil-gas inlet and a pyrolysis gas outlet, and the high-temperature oil-gas inlet is connected with the high-temperature oil-gas outlet;
the calcium carbide production unit comprises a pyrolysis gas inlet, a solid carbon-containing substance inlet and a calcium carbide product outlet, wherein the pyrolysis gas inlet is connected with the pyrolysis gas outlet, and the solid carbon-containing substance inlet is connected with the solid carbon-containing substance outlet.
2. The system of claim 1, wherein the separation unit is one of an air classification unit, a magnetic separation unit, or an electrostatic classification unit, or a combination thereof.
3. The system of claim 1, wherein the solid carbonaceous outlet is provided with a sealed discharge.
4. The system of claim 1, wherein the calcium carbide production unit comprises a calcium carbide tail gas outlet; the system further comprises a gas purification and dust removal unit, wherein the gas purification and dust removal unit comprises a calcium carbide tail gas inlet, and the calcium carbide tail gas inlet is connected with the calcium carbide tail gas outlet.
5. The system of claim 1, wherein the calcium carbide production unit further comprises an oxidant gas inlet through which oxidant gas is introduced into the auxiliary pyrolysis gas for combustion.
6. The system of claim 1, wherein the oil-gas separation purification unit further comprises a pyrolysis oil outlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106276904A (en) * | 2016-08-29 | 2017-01-04 | 北京神雾环境能源科技集团股份有限公司 | The system and method that a kind of Waste ammunition processes |
| CN107457246A (en) * | 2017-09-04 | 2017-12-12 | 华中科技大学 | The method of the broken apart recovery copper remnants non-metal powders catalysis pyrolysis of useless circuit board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106276904A (en) * | 2016-08-29 | 2017-01-04 | 北京神雾环境能源科技集团股份有限公司 | The system and method that a kind of Waste ammunition processes |
| CN107457246A (en) * | 2017-09-04 | 2017-12-12 | 华中科技大学 | The method of the broken apart recovery copper remnants non-metal powders catalysis pyrolysis of useless circuit board |
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