CN113736503A - Pretreatment system and method used before thermal cracking of polymer - Google Patents
Pretreatment system and method used before thermal cracking of polymer Download PDFInfo
- Publication number
- CN113736503A CN113736503A CN202111111346.5A CN202111111346A CN113736503A CN 113736503 A CN113736503 A CN 113736503A CN 202111111346 A CN202111111346 A CN 202111111346A CN 113736503 A CN113736503 A CN 113736503A
- Authority
- CN
- China
- Prior art keywords
- thermal cracking
- aging
- cavity
- heating
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a pretreatment system and a pretreatment method for a polymer before thermal cracking, and by adopting the pretreatment method and the pretreatment system for the polymer before thermal cracking, the pyrolysis process (from long chain to short chain) of the polymer after thermal aging and ultraviolet accelerated aging is easier and quicker, and the time is greatly reduced. In other words, less energy is consumed to complete the thermal cracking process. If the catalyst is used in combination, the energy consumption for thermal cracking is further reduced. In large-scale thermal cracking treatment projects of waste polymers, raw materials are often accumulated in large quantities in warehouses or outdoors, so that the raw materials can be fully aged and pretreated before thermal cracking according to the invention, and energy consumption can be saved in subsequent thermal cracking.
Description
Technical Field
The invention belongs to the technical field of energy chemical industry, and particularly relates to a method and a system for pretreating a polymer material before heat understanding.
Background
Thermal cracking is the inert environment (i.e., in the absence of oxygen) of organic matter[1]Thermochemical decomposition into non-condensable gases, condensable liquids and solid residual by-products, biochar or charcoal.
In a single thermal cracking reactor, oxygen must be excluded or the product gases, oils and char burn, thereby losing product and reducing efficiency. Prior to petrochemical production lines, thermally crackingThe batch distillation method is mainly used for producing useful substances such as methanol, acetone, acetic acid and creosote from wood[2]。
Today, thermal cracking has great potential to convert waste such as plastics/rubber/biomass into valuable products such as fuels, electricity, heat and other valuable chemicals and materials to achieve maximum economic and environmental benefits. For example, liquid oils produced from different types of plastic wastes have higher heating values, ranging from 41.7 to 44.2MJ/kg, similar to that of conventional diesel fuels. Thus, after further processing and refinement, it has the potential for a variety of energy and transportation applications[3]。
In a report of Scotland zero waste, the authors compared the carbon dioxide emissions from 660 kg of diesel oil produced by thermal cracking 1000 kg of plastic with the carbon dioxide emissions from the same amount of diesel oil produced[4]. The emission amount associated with the production of other raw materials (excluding waste plastics) was 13.0kgCO2. For thermal cracking, these are the result of hydrogen consumed in the process. Incineration of the thermal cracking gas, distillation residue and 3% of the diesel product produced an on-site emission of 56kg CO2. The emission associated with all transport elements (product and waste) was 197kg CO2. According to these figures, the emission associated with pyrolysis is 266kg CO2The replacement savings associated with the production of substitute fossil diesel is 426kg CO2. Overall, the net emission of thermal cracking was-160 kg CO2。
Municipal solid waste is mainly derived from the treatment of general waste streams, including green waste, food waste and miscellaneous products (i.e. leather, textile, metal waste), which may be separated as non-compostable material[5]. Although most municipal solid waste eventually enters unsightly landfills, a large amount of waste is used to produce different value-added products, such as compost, feed and biogas[6]。
Most mixed municipal solid waste technologies attempt to process large heterogeneous mixed waste streams. This is not intended to purchase waste separately and seek a single technologyGovernments of solutions are attractive. However, approaches that find technical solutions for mixed waste treatment present unique challenges and are not as successful as more comprehensive source separation strategies. Gasification, thermal cracking and plasma arc techniques are most suitable for homogeneous material streams. The heterogeneous nature of municipal solid waste is not well suited to this type of technology[7]。
Comments on Andrew and Jumboke[8]It is shown that municipal solid waste pyrolysis plants for self-sustaining energy from waste are thermodynamically unverified, are practically unreliable, and are environmentally unfriendly when appropriate system boundaries are applied. No practical example of a self-contained municipal solid waste thermal cracking plant using natural gas, petroleum or coke was found.
For a homogeneous material stream, one energy efficient approach is to pre-treat the waste by removing wet organics and inert materials while retaining the energetic plastics in the waste stream. In the process of converting organic solid wastes into energy, various additional energy costs are generated in addition to the main thermal cracking energy costs. Sorting raw materials, conditioning, drying, chopping, cooling/condensing pyrolysis gas and purifying … … combustible gas, so that the energy consumption of each link is reduced, and the final aims of reducing the total energy consumption of the whole process and improving the energy efficiency are achieved.
Present in all solid organic waste (even apparently dry materials), at the surface and cellular level, and therefore unless the drying is set outside the system boundaries, it must be included in the energy balance. The removal of this water from the solid organic waste before the thermal cracking process takes place is energy intensive, since the latent and sensible enthalpies of the liquid and vapor phases, as well as the enthalpy of vaporization, are high[9]. Therefore, it is preferred to dehydrate and dry outside of a pyrolysis system with controlled temperature and good ventilation circulation, which is much better and more energy efficient than in a relatively closed pyrolysis reactor.
In a thermal cracking conversion process, the process of converting long chain hydrocarbons to short chain hydrocarbons requires an additional energy supply to drive the process, and thus the process is exothermically provided by electricity or by burning additional fuel. Generally, catalytic thermal cracking is the main technology for obtaining more petroleum or combustible gas at lower temperature and lower energy consumption.
Polymer degradation can be caused by heat (thermal degradation), light (photodegradation), ionizing radiation (radio degradation), mechanical action or fungi, bacteria, yeast, algae and their enzymes (biodegradation). The deleterious effects of weathering on polymers are generally attributed to a complex set of processes in which the combined action of ultraviolet light and oxygen dominates. The entire photoinitiation process in the presence of oxygen is commonly referred to as oxidative photodegradation or photooxidation. Purely thermal effects are possible because oxygen is always present, so the process is a thermo-oxidative degradation[10]. There are many different polymer degradation modes. They are very similar in that they all involve chemical reactions that result in bond cleavage. The main sources of polymer waste are currently: polypropylene, polyethylene, polystyrene foam, and rubber.
The wavelength of the ultraviolet light is 10 to 400 nm. Of these ultraviolet rays, a part having a wavelength of 10 to 300nm is absorbed by the atmosphere. Ultraviolet rays with a wavelength of 300-400 nm have a destructive effect, and the light energy is very large. Various plastics are affected in different wavelength regions. The most influential wavelength on polyester was 325 nm; 318nm polystyrene; the polyethylene is 300 nm; the polypropylene is 310 nm; polyvinyl chloride resin 310 nm; the wavelength of the chloroethylene-vinyl acetate copolymer is 322nm to 364 nm.
The greatest disadvantage of plastics is that they are far less heat resistant than metal and glass products, deform at slightly higher temperatures and are prone to burning. Even thermosetting resins smoke at temperatures exceeding 200 ℃ and cause flaking. Plastics can cause material changes such as degradation, oxidation, crosslinking or hydrolysis when heated for extended periods of time, even at temperatures well below the thermal decomposition temperature. These changes result in reduced performance of the material, so that the plastic articles are life-span.
In view of this, in the present invention, the dehydrated and dried material is subjected to heat aging at about 80 ℃ for a long time, which allows most of the polymer to age without sticking to the carrier. Then, a UV lamp tube with the ultraviolet wavelength of 280nm-400nm is adopted to carry out long-time UV light accelerated aging on the raw materials as a means for pretreating the polymer, and the energy consumption of subsequent thermal cracking is reduced by the pre-aging treatment mode. And a pretreatment system used before the thermal cracking of the polymer is designed.
Disclosure of Invention
The invention aims at the thermal cracking of polymers, in particular to waste polymers, and provides a pretreatment system and a pretreatment method before thermal cracking.
In order to achieve the purpose, the invention adopts the following technical scheme: a pretreatment system for use before thermal cracking of polymers comprising: the device comprises a feeding device, a controllable belt conveyor, a heating aging device, a UV light aging device and an automatic control device;
the polymer raw material is unloaded on a belt of a controllable belt conveyor through the feeding device, the heating aging device and the UV light aging device are arranged on a traveling route of the raw material on the belt in series, the polymer raw material is sequentially subjected to dehydration drying treatment and UV light aging treatment, all the processes are controlled by the automatic control device, and the dehydration temperature and time of the polymer raw material and the intensity and time of the UV light aging are controlled.
Further, the heating aging apparatus includes: more than one group of heating aging modules and air-inducing and moisture-removing devices;
the heating aging module comprises a dehydration drying cavity, a temperature-controllable heating cavity and an exhaust pipeline; the dehydration drying cavity is sleeved outside the conveyor belt, the temperature-controllable heating cavity is arranged at the upper part of the dehydration drying cavity to provide a heat source, the joint between the temperature-controllable heating cavity and the dehydration drying cavity is not sealed, water vapor flows through a plurality of holes or pores, one end of the exhaust pipeline is connected with the temperature-controllable heating cavity, the other end of the exhaust pipeline is connected with the induced air dehumidifying device, and the water vapor generated during drying is pumped away by the induced air dehumidifying device;
when the number of the heating aging modules is more than two groups, the heating aging modules are arranged on the conveyor in series.
Furthermore, a thermometer and a non-contact infrared online moisture tester are arranged in the dehydration drying cavity and used for detecting the temperature in the cavity and the moisture content of the polymer raw material and transmitting the temperature and the moisture content to the automatic control device in real time.
Furthermore, the temperature-controllable heating cavity is internally heated by electricity or electromagnetism.
Further, the height of the conveyor belt from the top of the dehydration drying cavity is 15-20 cm.
Further, the UV light aging device comprises more than one group of UV light aging cavities, the UV light aging cavities are sleeved outside the conveyor belt, and a plurality of UV ultraviolet lamp tubes with ultraviolet wavelengths of 280-400 nm are arranged below the top in the cavities; when the number of the UV light aging cavities is more than two groups, the UV light aging cavities are arranged on the conveyor in series.
Further, the height of the distance between the conveyor belt and the top of the UV light aging cavity is 15-20 cm.
Further, the UV ultraviolet lamp tube has a power of at least 40W and an intensity of at least 30mW/cm2And a UV light source intensity meter is also arranged in the UV light aging cavity and used for measuring the intensity of the UV light source in the cavity and transmitting the intensity to the automatic control device in real time.
A method for pre-treating a polymer prior to thermal cracking, comprising the steps of:
(1) crushing a polymer raw material, heating and dehydrating at 80-90 ℃ until the water content is 5% -8%, and then keeping the temperature to continue heating for at least 48 h;
(2) continuously irradiating for at least 12d under an ultraviolet lamp; the ultraviolet lamp emits ultraviolet light with the wavelength of 280-400 nm, the power of at least 40W and the intensity of at least 30mW/cm2。
The polymer is pretreated, and then the pretreated polymer is subjected to thermal cracking.
By adopting the method and the pretreatment system for pretreating the polymer before thermal cracking, the pyrolysis process (from long chain to short chain) of the polymer after thermal aging and ultraviolet accelerated aging is easier and quicker, and the time is greatly reduced. In other words, less energy is consumed to complete the thermal cracking process. If the catalyst is used in combination, the energy consumption for thermal cracking is further reduced.
In large-scale thermal cracking treatment projects of waste polymers, raw materials are often accumulated in large quantities in warehouses or outdoors, so that the raw materials can be fully aged and pretreated before thermal cracking according to the invention, and energy consumption can be saved in subsequent thermal cracking.
Drawings
FIG. 1 is a schematic diagram of the pretreatment system of the polymer of the example prior to thermal cracking.
Wherein: 1-a feeding system; 2, crushing the raw materials; 3, heating the aging cavity; 4-a thermometer; 5-non-contact infrared online moisture meter; 6-heating the cavity by controlling the temperature; 7-an exhaust duct; 8, an induced air dehumidification system; 9-UV light aging cavity; 10-UV ultraviolet lamp tube; 11-UV light source intensity meter; 12-a blanking system; 13-a controllable belt conveyor; 14-a reduction motor; 15-a support frame; 16-automatic control system.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in FIG. 1, the polymer feedstock 2 (waste plastics or rubber) is discharged from the feeding system 1 onto the belt of a controllable belt conveyor 13 after mechanical crushing. The speed of the conveyor 13 is controlled by a gear motor 14 according to the specific situation required. Firstly, the raw material 2 enters a raw material dehydration, drying, heating and aging cavity 3, and a temperature-controllable heating cavity 6, an exhaust pipeline 7 and a variable-frequency induced air dehumidifying system 8 are connected on the raw material dehydration, drying, heating and aging cavity. Then the conveyor stops running, the raw material 2 is firstly dehydrated and dried at the temperature of 80 ℃, and the temperature and the moisture content of the raw material in the process can be measured by a thermometer 4 and a non-contact infrared online moisture meter 5 which are arranged in the cavity 3. The chamber 3 is made of 304 or 316 stainless steel. The top of which is at a distance of about 20cm from the material 2. The shell of the temperature-controllable heating cavity 6 is made of 304 or 316 stainless steel, and the heating power can be automatically adjusted according to the thermometer by adopting electric or electromagnetic heating. The joint of the heating aging cavity and the temperature-controllable heating cavity is not sealed, and a plurality of holes/pores are used for the circulation of water vapor. An exhaust pipe 7 is connected to each heating chamber 6 and is made of 304 stainless steel. The vapor generated during drying is timely pumped away by the variable-frequency induced air dehumidifying system 8, and the exhaust volume of the dehumidifying system 8 can be adjusted according to the requirement. Because raw materials are dehydrated, dried, heated and aged to be the series connection structure of the same module, the size of the cavity can be designed according to the size of the raw materials processing capacity, more heating and aging cavities, temperature-controllable heating cavities and exhaust pipeline parts can be connected in series, and a frequency conversion type induced air dehumidifying system 8 can select equipment with higher power.
When the non-contact infrared online moisture meter 5 indicates that the moisture in the raw material is reduced to about 5%, the minimum air discharge amount can be selected or stopped by the air inducing and dehumidifying system 8 at this time, and then the heating and aging treatment is carried out for at least 48 hours at the temperature of 80 ℃.
After the dehydration, drying, heating and aging process is completed, the conveyor 13 is restarted to bring the raw material into the raw material UV photo-aging chamber 9. The cavity of the UV light aging cavity 9 is made of 304 or 316 stainless steel, and the top is completely sealed. A plurality of UV ultraviolet lamp tubes with ultraviolet wavelength of 280-400 nm are arranged below the top of the cavity, the power of each lamp tube is at least 40W, and the intensity of the UV lamp is at least 30mW/cm2And the distance between the UV lamp and the raw material is 15-20 cm. The UV light source intensity within the cavity is read by a UV light source intensity meter 11. For raw materialsThe UV continuous aging treatment should not be less than 12 days. Because the UV light aging cavity 9 is a serial structure of the same modules, the size of the cavity can be designed according to the processing amount of raw materials, and more cavities 9 and internal supporting facilities can be connected in series. After the raw material is subjected to the UV continuous aging treatment, the conveyor 13 is started to discharge the raw material into the discharging system 12. The whole process can be controlled by the automatic control system 16.
The conveyor is supported by a support frame 15.
Example 1
2kg of PP particle sample is dried and dehydrated by adopting the device, then continuously heated for 48 hours at the temperature of 90 ℃, and then a UVA-340nm lamp tube is used, the power is 100w, and the lamp intensity is as follows: 30mW/cm2The samples 20cm from the UV tube were subjected to UV artificial aging for 12 consecutive days.
Comparative example 1
2kg of unaged PP pellets.
Comparative example 2
Natural ageing treatment (complete exposure to natural conditions) 2kg of PP granules for 12 consecutive days.
Test results
The thermal cracking experiment is carried out in a full-automatic 5kW electromagnetic induction heating thermal cracking system. The PP samples of example 1, comparative example 2 were subjected to 3 thermal cracking experiments under identical experimental conditions without any catalyst. The environmental temperature of 3 thermal cracking experiments is 27 +/-0.5 ℃. The set temperature of the water cooler for condensation is 3 ℃, and the starting time of the water coolers for the two tests is completely the same. Table 1 shows the test results.
TABLE 1 comparative thermal cracking tests on different pretreated samples
It can be seen from table 1 that the PP particles with two different aging treatments do not differ much from the particles without aging treatment in the oil yield under the same experimental conditions without any catalyst. However, heat-aged plus UV accelerated aging PP pellets started to produce pyrolysis oil in about 15 minutes, which took about 56 minutes to complete the pyrolysis process. Naturally aged PP particles begin to produce pyrolysis oil after about 24 minutes, and take about 77 minutes to complete the entire pyrolysis process. Whereas unaged PP particles begin to produce pyrolysis oil after about 25 minutes, which takes about 78 minutes to complete the pyrolysis process. Given reasonable deviations, the short-term naturally aged samples have little improvement in oil production time and reduction in time required to complete the entire pyrolysis process compared to the unaged samples.
However, we have noted that the pyrolysis process (from long to short chains) of PP-plastic particles becomes easier and faster after heat aging plus UV accelerated aging, and the time is also greatly reduced. In other words, less energy is consumed to complete the thermal cracking process. If the catalyst is used in combination, the energy consumption for thermal cracking is further reduced.
In large-scale thermal cracking treatment projects of waste polymers, raw materials are often accumulated in large quantities in warehouses or outdoors, so that the raw materials can be fully aged and pretreated before thermal cracking according to the invention, and energy consumption can be saved in subsequent thermal cracking.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Reference to the literature
1.Kaimin Shih,Environmental Materials and Waste:Resource Recovery and Pollution Prevention,Apr 19,2016,Academic Press,ISBN 9780128039069
2.Garcia-Nunez,J.A.,Palaez-Samaniego,M.R.,Garcia-Perez,M.E.,Fonts,I.,Abrego,J.,Westerhof,R.J.M.,Garcia-Perez,M.,2017.Historical developments of pyrolysis reactors:a review.Energ.Fuel 31,5751–577
3.Rashid Miandad,Mohammad Rehan,Mohammad A.Barakat,Asad S.Aburiazaiza,Hizbullah Khan,Iqbal M.I.Ismail,Jeya Dhavamani,Jabbar Gardy,Ali Hassanpour and Abdul-Sattar Nizami,Catalytic Pyrolysis of Plastic Waste:Moving Toward Pyrolysis Based Biorefineries,Front.Energy Res.,19 March 2019|https://doi.org/10.3389/fenrg.2019.00027
4.Sam Haig,Liz Morrish,Roger Morton,Uchenna Onwuamaegbu,Peter Speller and Simon Wilkinson，Plastic to oil IFM002 final report
5.Hargreaves,J.C.,Adl,M.S.,Warman,P.R.,2008.A review of the use of composted municipal solid waste in agriculture.Agriculture,Ecosystems and Environment 123,1e14.
6.Vithanage,M.,Wijesekara,S.S.R.M.D.H.R.,Siriwardana,A.R.,Mayakaduwa,S.S.,Ok,Y.S.,2014.Management of municipal solid waste landfill leachate:a global environmental issue.In:Malik,A.,Grohmann,E.,Akhtar,R.(Eds.),Environmental Deterioration and Human Health.Springer,Netherlands
7.Neil Tangri and Monica Wilson,Waste Gasification&Pyrolysis:High Risk,Low Yield Processes for Waste Management,A Technology Risk Analysis GAIA March 2017
8.Andrew Neil Rollinson,Jumoke Mojisola Oladejo,‘Patented blunderings’,efficiency awareness,and self-sustainability claims in the pyrolysis energy from waste sector,Resources,Conservation&Recycling 141(2019)233–242
9.Twigg,M.V.,1996.Catalyst Handbook,2nd ed.Manson,London,pp.17–282.
10.Feldman D(2002)Polymer weathering:photo-oxidation.Journal of polymer and the environmental 10:163–173
Claims (10)
1. A pretreatment system for use before thermal cracking of polymers, comprising: the device comprises a feeding device, a controllable belt conveyor, a heating aging device, a UV light aging device and an automatic control device;
the polymer raw material is unloaded on a belt of a controllable belt conveyor through the feeding device, the heating aging device and the UV light aging device are arranged on a traveling route of the raw material on the belt in series, the polymer raw material is sequentially subjected to dehydration drying treatment and UV light aging treatment, all the processes are controlled by the automatic control device, and the dehydration temperature and time of the polymer raw material and the intensity and time of the UV light aging are controlled.
2. The pretreatment system for use before thermal cracking of polymers according to claim 1, wherein: the heating aging apparatus includes: more than one group of heating aging modules and air-inducing and moisture-removing devices;
the heating aging module comprises a dehydration drying cavity, a temperature-controllable heating cavity and an exhaust pipeline; the dehydration drying cavity is sleeved outside the conveyor belt, the temperature-controllable heating cavity is arranged at the upper part of the dehydration drying cavity to provide a heat source, the joint between the temperature-controllable heating cavity and the dehydration drying cavity is not sealed, water vapor flows through a plurality of holes or pores, one end of the exhaust pipeline is connected with the temperature-controllable heating cavity, the other end of the exhaust pipeline is connected with the induced air dehumidifying device, and the water vapor generated during drying is pumped away by the induced air dehumidifying device;
when the number of the heating aging modules is more than two groups, the heating aging modules are arranged on the conveyor in series.
3. The pretreatment system for use before thermal cracking of polymers according to claim 2, wherein: and a thermometer and a non-contact infrared online moisture tester are arranged in the dehydration drying cavity and used for detecting the temperature in the cavity and the moisture content of the polymer raw material and transmitting the temperature and the moisture content to the automatic control device in real time.
4. The pretreatment system for use before thermal cracking of polymers according to claim 2, wherein: the temperature-controllable heating cavity is internally heated by electricity or electromagnetism.
5. The pretreatment system for use before thermal cracking of polymers according to claim 2, wherein: the height of the conveyor belt from the top of the dehydration drying cavity is 15-20 cm.
6. The pretreatment system for use before thermal cracking of polymers according to claim 1, wherein: the UV light aging device comprises more than one group of UV light aging cavities, the UV light aging cavities are sleeved outside the conveyor belt, and a plurality of UV ultraviolet lamp tubes with ultraviolet wavelengths of 280-400 nm are arranged below the top in the cavities; when the number of the UV light aging cavities is more than two groups, the UV light aging cavities are arranged on the conveyor in series.
7. The pretreatment system for use before thermal cracking of polymers according to claim 6, wherein: the height of the distance between the conveyor belt and the top of the UV light aging cavity is 15-20 cm.
8. The pretreatment system for use before thermal cracking of polymers according to claim 6, wherein: the UV ultraviolet lamp tube is arranged at the top of the UV light aging cavity, and has a power of at least 40W and an intensity of at least 30mW/cm2And a UV light source intensity meter is also arranged in the UV light aging cavity and used for measuring the intensity of the UV light source in the cavity and transmitting the intensity to the automatic control device in real time.
9. A method for pretreating a polymer prior to thermal cracking, comprising the steps of:
(1) crushing a polymer raw material, heating and dehydrating at 80-90 ℃ until the water content is 5% -8%, and then keeping the temperature to continue heating for at least 48 h;
(2) continuously irradiating for at least 12d under an ultraviolet lamp; the ultraviolet lamp emits ultraviolet light with the wavelength of 280-400 nm, the power of at least 40W and the intensity of at least 30mW/cm2。
10. A method for thermally cracking a polymer, characterized by: the method of claim 9, wherein the polymer is pretreated and the pretreated polymer is subsequently thermally cracked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111111346.5A CN113736503B (en) | 2021-09-23 | 2021-09-23 | Pretreatment system and method for polymer before thermal cracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111111346.5A CN113736503B (en) | 2021-09-23 | 2021-09-23 | Pretreatment system and method for polymer before thermal cracking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113736503A true CN113736503A (en) | 2021-12-03 |
| CN113736503B CN113736503B (en) | 2023-06-30 |
Family
ID=78740430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111111346.5A Active CN113736503B (en) | 2021-09-23 | 2021-09-23 | Pretreatment system and method for polymer before thermal cracking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113736503B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331378A (en) * | 2015-10-28 | 2016-02-17 | 贵州安泰再生资源科技有限公司 | Method of comprehensively utilizing junked tire subjected to pyrolysis |
| CN108264938A (en) * | 2018-01-15 | 2018-07-10 | 江西蓝天路之友环卫设备科技有限公司 | A kind of application of city life garbage treatment process |
| CN207793170U (en) * | 2018-01-27 | 2018-08-31 | 攀枝花市金开圆科技有限公司 | The environmentally friendly recovery and processing system of waste tire |
| CN113030039A (en) * | 2021-02-24 | 2021-06-25 | 北京化工大学 | Visual identification and quantitative analysis method for multiple aging paths of polymer |
-
2021
- 2021-09-23 CN CN202111111346.5A patent/CN113736503B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331378A (en) * | 2015-10-28 | 2016-02-17 | 贵州安泰再生资源科技有限公司 | Method of comprehensively utilizing junked tire subjected to pyrolysis |
| CN108264938A (en) * | 2018-01-15 | 2018-07-10 | 江西蓝天路之友环卫设备科技有限公司 | A kind of application of city life garbage treatment process |
| CN207793170U (en) * | 2018-01-27 | 2018-08-31 | 攀枝花市金开圆科技有限公司 | The environmentally friendly recovery and processing system of waste tire |
| CN113030039A (en) * | 2021-02-24 | 2021-06-25 | 北京化工大学 | Visual identification and quantitative analysis method for multiple aging paths of polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113736503B (en) | 2023-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lin et al. | Combustion, pyrolysis and char CO2-gasification characteristics of hydrothermal carbonization solid fuel from municipal solid wastes | |
| US8354005B2 (en) | Microwave gasification, pyrolysis and recycling of waste and other organic materials | |
| CN106694519B (en) | Life-garbage comprehensive treatment technology | |
| Stobernack et al. | Evaluation of the energetic and environmental potential of the hydrothermal carbonization of biowaste: Modeling of the entire process chain | |
| CN105737163A (en) | Household garbage internal circulation sealed low-temperature pyrolysis system and method based on decoupling combustion | |
| Su et al. | Microwave-assisted pyrolysis technology for bioenergy recovery: Mechanism, performance, and prospect | |
| JP5176016B2 (en) | Superheated steam continuous recycling equipment | |
| KR101011973B1 (en) | The Producing Process of Bio Gas from WasteWater and Manufacturing Apparatus | |
| US20240059975A1 (en) | Organic Waste Carbonization System | |
| CN113736503B (en) | Pretreatment system and method for polymer before thermal cracking | |
| EP2208000B1 (en) | Method and apparatus for simultaneous gasification of organic materials and residual humus materials of stabilized municipal and industrial sewage sludges | |
| KR101788302B1 (en) | Biogas generation system of organic wastes | |
| CN217499033U (en) | Microwave pyrolysis sludge power generation treatment system | |
| CN105733619A (en) | Urban household garbage thermal cracking treatment device and method for conducting urban household garbage thermal cracking with same | |
| Anis et al. | Thermal characteristics of microwave reactor for pyrolysis of food waste | |
| US11198819B1 (en) | Food waste carbonizer | |
| KR101695977B1 (en) | Paddle desiccator using microwave for resource sewage sludge | |
| EP2978822B1 (en) | Method and system for hybrid production of liquid fuel from waste, without the use of catalytic compounds. | |
| Williams et al. | Demonstration scale flash pyrolysis of municipal solid waste | |
| CN206540133U (en) | A kind of house refuse low temperature pyrogenation system | |
| CN109226213A (en) | A kind of domestic garbage comprehensive recycling processing method | |
| Akram et al. | Towards an improved pyrolysis system: Integrating solar energy based pre-heating system | |
| Ge et al. | Study on the thermal transformation of basic components of wind turbine blade | |
| KR102596746B1 (en) | Apparatus for manufacturing biochar of organic waste | |
| JPH07119948A (en) | Integrated processing system for discharged water and waste material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |