CN113845934B - Rubber softening oil processing device and method - Google Patents
Rubber softening oil processing device and method Download PDFInfo
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- CN113845934B CN113845934B CN202111145932.1A CN202111145932A CN113845934B CN 113845934 B CN113845934 B CN 113845934B CN 202111145932 A CN202111145932 A CN 202111145932A CN 113845934 B CN113845934 B CN 113845934B
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- 238000012545 processing Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 113
- 238000010438 heat treatment Methods 0.000 claims abstract description 110
- 238000000197 pyrolysis Methods 0.000 claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims description 173
- 238000001125 extrusion Methods 0.000 claims description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 27
- 239000003546 flue gas Substances 0.000 claims description 27
- 239000000779 smoke Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000011812 mixed powder Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 2
- 238000004898 kneading Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 93
- 230000008569 process Effects 0.000 description 14
- 230000009471 action Effects 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- 230000009931 harmful effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000010692 aromatic oil Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010057 rubber processing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/10—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal from rubber or rubber waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/005—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/30—Pyrolysing
- F23G2201/303—Burning pyrogases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
Abstract
The invention provides a rubber softening oil processing device and a method, wherein the rubber softening oil processing device comprises a frame, a screw conveyor, a double-screw extruder, a first gas furnace and a first combustion cylinder; a preheating chamber is arranged on the frame; the screw conveyor is positioned in the preheating chamber, and a heat conducting oil sleeve is arranged in the screw conveyor; the first gas furnace is used for combusting pyrolysis gas in the double-screw extruder; the first combustion cylinder is arranged right above the first gas furnace, a first heating runner is arranged in the cylinder wall, a liquid inlet and a liquid outlet of the first heating runner are respectively correspondingly communicated with a liquid outlet and a liquid inlet of the heat conducting oil sleeve through oil pipes, and a circulating pump is arranged on the oil pipes in a series mode. The rubber softening oil processing device provided by the invention can burn pyrolysis gas, improves the processing environment-friendly property, and heats the screw conveyor by using combustion heat, so that the heating power consumption of a preheating chamber per se can be reduced, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of rubber recycling, and particularly relates to a rubber softening oil processing device and method.
Background
The method is characterized in that softening oil is needed to be used in the rubber processing process to improve the performance of rubber, aromatic oil is the largest in the use amount of the rubber softening oil, the common aromatic oil contains more polycyclic aromatic hydrocarbon, and the polycyclic aromatic hydrocarbon has the harmful properties of carcinogenesis, teratogenesis and the like, so that the polycyclic aromatic hydrocarbon content in a rubber product is required to be strictly controlled, based on the phenomenon, the technology for processing waste tire (rubber) rubber powder into environment-friendly rubber softening oil by utilizing a micro pyrolysis catalyst and related equipment at about 300 ℃ is researched and developed at present, the content of the polycyclic aromatic hydrocarbon detected by a final product is 0.4ppm and is far lower than 50ppm of a standard line (EU), and the product can play a role in rubber softening and has a reinforcing effect on the rubber performance through production verification. The main equipment currently used for processing the softening oil of the waste rubber is a double-screw extruder, the double-screw extruder is provided with different functional modules such as a conical forced feeding section, an extrusion shearing section, an extrusion section and the like, and the working temperature of the double-screw extruder is controlled to 280-350 ℃ through heating and cooling means, so that rubber powder is subjected to micro-pyrolysis under the action of heat and force, softening oil is obtained, pyrolysis gas can be generated in the process of micro-pyrolysis of the rubber, although the harm of the pyrolysis gas generated by adopting the process is extremely small, the direct emptying mode is still unfavorable for environmental protection, in addition, the rubber powder, the micro-pyrolysis catalyst, the activator and the like are required to be mixed in proportion before being sent into the double-screw extruder, and the mixed powder is subjected to plasticizing treatment in the temperature environment of about 100 ℃, so that a preheating chamber is additionally arranged for heating the mixed powder, the heat requirement of the whole process is extremely high, and the softening oil obtained by utilizing the waste rubber processing is high in cost, and the burden of enterprises is increased.
Disclosure of Invention
The embodiment of the invention provides a rubber softening oil processing device and method, which aim to improve the environmental protection property of processing softening oil by adopting waste rubber and reduce the processing cost.
In order to achieve the above purpose, the invention adopts the following technical scheme: in a first aspect, a rubber softening oil processing device is provided, comprising a frame, a screw conveyor, a double screw extruder, a first gas furnace and a first combustion cylinder; wherein, a preheating chamber is arranged on the frame; the screw conveyor is arranged on the frame, is positioned in the preheating chamber, is used for plasticizing, extruding and discharging mixed powder under the condition of set temperature, and is embedded with a heat-conducting oil sleeve on the inner wall of the machine barrel of the screw conveyor; the double-screw extruder is arranged on the frame, and the feeding end of the double-screw extruder is connected with the discharging end of the screw conveyor and is used for micro-pyrolyzing the plasticized mixed powder under the condition of a set temperature and forming softened oil to be discharged; the first gas furnace is arranged on the side wall of the discharge end of the double-screw extruder, and an air inlet pipe of the first gas furnace is communicated with the inner cavity of the double-screw extruder and is used for burning pyrolysis gas generated in the double-screw extruder; the first combustion cylinder is arranged right above the first gas furnace, a first heating runner is arranged in the cylinder wall of the first combustion cylinder, a liquid inlet and a liquid outlet of the first heating runner are correspondingly communicated with a liquid outlet and a liquid inlet of the heat conducting oil sleeve through oil pipes respectively, and a circulating pump is arranged on the oil pipes in a series mode.
With reference to the first aspect, in one possible implementation manner, the first half section of the twin-screw extruder is a micro pyrolysis section, the second half section is an extrusion section, wherein the first gas furnace is arranged at the tail end of the micro pyrolysis section, the tail end of the extrusion section is provided with a second gas furnace, a second combustion cylinder is arranged on the second gas furnace, a second heating runner is arranged in the cylinder wall of the second combustion cylinder, and the second heating runner is connected with the first heating runner in series.
In some embodiments, the liquid inlet of the first heating runner is communicated with the liquid outlet of the second heating runner, the liquid outlet of the first heating runner is communicated with the liquid inlet of the heat conducting oil jacket, and the liquid inlet of the second heating runner is communicated with the liquid outlet of the heat conducting oil jacket.
In some embodiments, the first heating flow channel and the second heating flow channel are both in spiral coiled structures, and the heat conducting oil sleeve is internally provided with spiral oil holes in the spiral coiled structures.
In some embodiments, the front end of the micro-pyrolysis section is provided with a first combustion-supporting gas pipe communicated with the inner cavity of the micro-pyrolysis section; the front end of the extrusion section is provided with a second combustion-supporting gas pipe communicated with the inner cavity of the extrusion section; a spray pipe is arranged between the micro pyrolysis section and the second combustion-supporting gas pipe, and the spray pipe is communicated with the inner cavity of the extrusion section.
In some embodiments, a first range hood is arranged right above the first combustion cylinder, a second range hood is arranged right above the second combustion cylinder, flue gas pipelines are connected with flue gas discharge ends of the first range hood and the second range hood together, the flue gas pipelines are communicated with a preheating chamber, and the preheating chamber is provided with an exhaust pipe which is used for extending into the lower part of the liquid level of the water container.
In some embodiments, the first combustion cylinder and the second combustion cylinder are provided with a core cylinder extending along the axial direction of the first combustion cylinder and the second combustion cylinder, and a flue gas channel is formed between the core cylinder and the inner wall of the first combustion cylinder or the second combustion cylinder.
The rubber softening oil processing device provided by the invention has the beneficial effects that: compared with the prior art, the rubber softening oil processing device has the advantages that the plasticized mixed powder can be combusted after being mixed with air in the first gas furnace under the action of heat and force of the double-screw extruder, so that the first combustion cylinder is heated, the heat conducting oil flowing in the first heating flow passage is further heated, the heated heat conducting oil enters the heat conducting oil sleeve inlaid on the inner wall of the machine barrel of the screw conveyor, the mixed powder is heated and plasticized, the circulating pump is utilized to realize the circulating heating of the heat conducting oil, the power consumption of the preheating chamber (the heating device arranged in the preheating chamber) for heating the screw conveyor can be greatly reduced, the processing cost of the rubber softening oil is reduced, and the pyrolysis gas is combusted to decompose trace harmful components in the pyrolysis gas, so that the smoke generated after combustion meets the environmental protection emission requirement, and the processing environmental protection property of the rubber softening oil is improved.
In a second aspect, the embodiment of the invention also provides a processing method of the rubber softening oil, which comprises the following steps:
a first gas furnace is arranged at the tail end of a micro pyrolysis section of the double-screw extruder, and a second gas furnace is arranged at the tail end of an extrusion section; wherein, the air inlet pipe of the first gas furnace is communicated with the inner cavity of the micro pyrolysis section, and the air inlet pipe of the second gas furnace is communicated with the inner cavity of the extrusion section;
combustion-supporting gas is respectively introduced into the front end of the micro pyrolysis section and the front end of the extrusion section; the combustion-supporting gas introduced into the micro-pyrolysis section is mixed with pyrolysis gas, most of the mixed gas enters the first gas furnace for combustion, and the rest of the mixed gas enters the extrusion section and is mixed with the combustion-supporting gas introduced into the extrusion section and enters the second gas furnace for combustion;
the heat generated by combustion in the first gas furnace and the second gas furnace is used for heating the screw conveyer in the preheating chamber.
With reference to the second aspect, in one possible implementation manner, the screw conveyor for heating the preheating chamber using heat generated by combustion in the first gas furnace and the second gas furnace includes:
a first combustion cylinder and a second combustion cylinder are respectively arranged on the first gas furnace and the second gas furnace, wherein a first heating flow passage is arranged in the first combustion cylinder, a second heating flow passage is arranged in the second combustion cylinder, and the first heating flow passage and the second heating flow passage are connected in series and are connected with a heat conduction oil sleeve on the inner wall of a machine barrel of the screw conveyor to form a circulating heating loop;
a first range hood and a second range hood are respectively covered above the first combustion cylinder and the second combustion cylinder; the smoke discharge ends of the first smoke ventilator and the second smoke ventilator are communicated with the preheating chamber;
an exhaust pipe is arranged on the top wall of the preheating chamber and is led into the water container below the liquid level.
In some embodiments, the screw conveyor for using heat generated by combustion in the first gas furnace and the second gas furnace to heat the preheating chamber further comprises: spraying water is introduced into the front end of the extrusion section.
The rubber softening oil processing method provided by the invention has the beneficial effects that: compared with the prior art, the rubber softening oil processing method has the advantages that the first gas furnace is arranged at the tail end of the micro pyrolysis section of the double-screw extruder, combustion-supporting gas is introduced into the front end of the micro pyrolysis section, pyrolysis gas generated in the micro pyrolysis process of a rubber mixed material under the action of heat and force of the micro pyrolysis section can be mixed and burnt, a small part of pyrolysis gas which cannot directly enter the first gas furnace enters the extrusion section along with the pyrolyzed material and is secondarily mixed with the combustion-supporting gas introduced into the front end of the extrusion section and enters the second gas furnace at the tail end of the extrusion section for combustion treatment, and as combustion-supporting gas and pyrolysis gas are respectively introduced into the micro pyrolysis section and the extrusion section for primary mixing, the mixed gas can be combusted more fully after entering the gas furnace, the content of toxic substances of smoke gas caused by insufficient combustion is avoided, the smoke gas generated by combustion can meet the environment-friendly emission requirement, the heat generated by combustion of the two gas furnaces is used for a screw conveyor in a preheating chamber, plasticizing temperature condition is provided for the rubber mixed powder, and the power consumption of the heating device (the heating screw conveyor in the heating chamber can be reduced), and the processing cost is lowered.
Drawings
FIG. 1 is a schematic diagram of a rubber softening oil processing device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a partial enlarged structure at A in FIG. 1;
FIG. 3 is a schematic view of a first combustion can and a second combustion can according to an embodiment of the present invention.
In the figure: 10. a frame; 11. a preheating chamber; 111. an exhaust pipe; 20. a screw conveyor; 21. a heat conducting oil jacket; 211. a spiral oil hole; 30. a twin screw extruder; 31. a first combustion-supporting gas pipe; 32. a second combustion-supporting gas pipe; 33. a shower pipe; 40. a first gas furnace; 41. a first combustion cylinder; 411. a first heating flow path; 412. a circulation pump; 413. an oil pipe; 50. a second gas furnace; 51. a second combustion cylinder; 511. a second heating flow path; 512. a core barrel; 513. an auxiliary hot runner; 514. a vent hole; 61. a first range hood; 62. the second range hood; 63. a flue gas duct; 70. a water container.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 3, a description will be given of a rubber softening oil processing apparatus according to the present invention. The rubber softening oil processing device comprises a frame 10, a screw conveyor 20, a double-screw extruder 30, a first gas furnace 40 and a first combustion cylinder 41; wherein, a preheating chamber 11 is arranged on the frame 10; the screw conveyor 20 is arranged on the frame 10 and is positioned in the preheating chamber 11 and is used for plasticizing, extruding and discharging mixed powder under the set temperature condition, and a heat conducting oil sleeve 21 is embedded in the inner wall of the machine barrel of the screw conveyor 20; the double-screw extruder 30 is arranged on the frame 10, and a feeding end is connected with a discharging end of the screw conveyor 20 and is used for micro-pyrolyzing plasticized mixed powder under the set temperature condition and forming softened oil to be discharged; the first gas furnace 40 is arranged on the side wall of the discharge end of the double-screw extruder 30, and an air inlet pipe of the first gas furnace 40 is communicated with the inner cavity of the double-screw extruder 30 and is used for burning pyrolysis gas generated in the double-screw extruder 30; the first combustion cylinder 41 is arranged right above the first gas furnace 40, a first heating runner 411 is arranged in the cylinder wall of the first combustion cylinder 41, a liquid inlet and a liquid outlet of the first heating runner 411 are respectively correspondingly communicated with a liquid outlet and a liquid inlet of the heat conducting oil sleeve 21 through an oil pipe 413, and a circulating pump 412 is arranged on the oil pipe 413 in a series mode.
It should be noted that, the process and technology of forming softening oil by the force action of the twin-screw extruder under the condition of a certain temperature of the mixed powder are the prior art, and are not repeated herein, in the working process of the twin-screw extruder 30, pyrolysis gas is extruded along with the materials and moves towards the discharge end of the twin-screw extruder 30, and when reaching the position of the gas furnace, the pyrolysis gas enters the gas furnace to be mixed and combusted with air; in addition, in the process of realizing the invention, the pyrolysis gas generated in the pyrolysis process is found to have combustibility, and the flue gas generated after combustion is detected to meet the environmental protection emission requirement; furthermore, as the prior art, a conventional heating source such as an electric heating plate/tube and an electromagnetic heating plate should be provided on the casing of the twin-screw extruder 30, and a conventional heating source is also provided in the preheating chamber 11 for heating the screw conveyor 20 to meet the plasticizing process temperature requirement of the rubber compound.
Specifically, in this embodiment, the heat-conducting oil jacket 21 is a sleeve with an oil groove embedded on the inner wall of the screw conveyor 20, or the oil groove is opened on the inner wall of the barrel of the screw conveyor 20, and the oil groove is sealed by the embedded sleeve to form a flow channel for the heat-conducting oil to circulate; the first combustion cylinder 41 may be directly butt-jointed to the first gas furnace 40, and a vent hole 514 is provided at the bottom end of the first combustion cylinder 41 to circulate air, or the first combustion cylinder 41 may be erected on the first gas furnace 40, which should ensure that air can smoothly enter the first gas furnace 40 to mix with pyrolysis gas for combustion.
Compared with the prior art, the rubber softening oil processing device provided by the embodiment has the advantages that the plasticized mixed powder can be combusted after being mixed with air in the first gas furnace 40 under the action of heat and force of the double-screw extruder 30, so that the first combustion cylinder 41 is heated, the heat conduction oil flowing in the first heating flow passage 411 is further heated, the heated heat conduction oil enters the heat conduction oil sleeve 21 inlaid on the inner wall of the cylinder of the screw conveyor 20, the mixed powder is heated and plasticized, the circulating pump 412 is utilized to realize the circulating flow heating of the heat conduction oil, the power consumption of the preheating chamber 11 (the heating device arranged in the preheating chamber) for heating the screw conveyor 20 can be greatly reduced, the processing cost of the rubber softening oil is reduced, and trace harmful components in the pyrolysis gas can be decomposed due to the combustion treatment of the pyrolysis gas, so that the smoke generated after combustion meets the environment-friendly emission requirements, and the processing environment friendliness of the rubber softening oil is improved.
In this embodiment, referring to fig. 1 and 3, the first half section of the twin-screw extruder 30 is a micro pyrolysis section, the second half section is an extrusion section, wherein the first gas furnace 40 is disposed at the end of the micro pyrolysis section, the end of the extrusion section is provided with a second gas furnace 50, the second gas furnace 50 is provided with a second combustion cylinder 51, a second heating runner 511 is disposed in the wall of the second combustion cylinder 51, and the second heating runner 511 is connected in series with the first heating runner 411.
It should be understood that the twin screw extruder 30 for processing the softening oil is correspondingly manufactured according to the pyrolysis principle of rubber powder under the action of heat and force, and comprises a micro pyrolysis section of a first half section, an extrusion section of a second half section, and specific structural combinations thereof (a conical forced feeding structure, a periodically arranged shearing block structure and a twill extrusion structure) are all existing structures for realizing the micro pyrolysis processing of rubber to form the softening oil, and therefore the details are not described herein. It should be noted that the rubber micro-pyrolysis process mainly occurs in the micro-pyrolysis section of the twin screw extruder 30, so that pyrolysis gas is mainly generated in the micro-pyrolysis section, and the extrusion section mainly acts to extrude and knead the mixture of the rubber hydrocarbon and carbon black after micro-pyrolysis to form a pasty oil (i.e. softening oil) and discharge the pasty oil.
Here, by arranging the gas furnaces and the corresponding combustion cylinders at the tail ends of the micro pyrolysis section and the extrusion section respectively, a large amount of pyrolysis gas generated by the micro pyrolysis section can be combusted by the first gas furnace 40, and a small amount of pyrolysis gas which cannot enter the first gas furnace 40 and a small amount of pyrolysis gas generated by the extrusion section can be combusted by the second gas furnace 50, so that the pyrolysis gas generated in the whole twin-screw extruder 30 can be ensured to be combusted, on one hand, the pyrolysis gas can be prevented from being directly discharged along with softened oil, on the other hand, the utilization rate of the pyrolysis gas can be improved, and the heat loss is avoided; in addition, through carrying out the series connection with the heating runner in two combustion cans and then being connected with conduction oil cover 21, can improve the heating time to the conduction oil under the unchangeable condition of conduction oil circulation efficiency to make the conduction oil obtain higher temperature, in order to satisfy the heating demand of screw conveyer 20, can greatly reduced the consumption of preheating chamber 11 itself, reduce processing cost.
In some embodiments, referring to fig. 1 and 3, the liquid inlet of the first heating runner 411 is communicated with the liquid outlet of the second heating runner 511, the liquid outlet of the first heating runner 411 is communicated with the liquid inlet of the heat conduction oil jacket 21, and the liquid inlet of the second heating runner 511 is communicated with the liquid outlet of the heat conduction oil jacket 21.
Since most of the pyrolysis gas enters the first gas furnace 40 to burn, only a small amount of pyrolysis gas burns in the second gas furnace 50, the combustion heat value of the second gas furnace 50 is necessarily lower than that of the first gas furnace 40, the temperature of the corresponding second combustion cylinder 51 is lower than that of the first combustion cylinder 41, the low-temperature heat conduction oil discharged by the heat conduction oil jacket 21 is firstly introduced into the second heating flow passage 511, after the heat conduction oil flowing through the second heating flow passage 511 is heated by the second gas furnace 50, the heat conduction oil enters the first heating flow passage 411 to be heated again under the action of the first gas furnace 40, so that the mixture materials in the screw conveyor 20 are heated after the higher temperature is obtained, the combustion heat value of the pyrolysis gas can be improved to the greatest extent, the power consumption of the preheating chamber 11 is reduced, and the cost is saved.
In some embodiments, referring to fig. 1 to 3, the first heating flow passage 411 and the second heating flow passage 511 are both spirally wound structures, and the inside of the heat conduction oil jacket 21 is a spiral oil hole 211 of the spirally wound structures. The spiral oil hole 211 with spiral coiling can improve the time and distance of heat conduction oil flowing through the first heating flow passage 411 and the second heating flow passage 511, so as to improve the heating time, and the spiral coiling arrangement mode is adopted to be heated uniformly and the heating area is large, so that the heating efficiency and the heating temperature of the heat conduction oil can be improved, and the power loss of the preheating chamber 11 per se is reduced. Specifically, the bottom of the combustion cylinder is closer to the combustion center of the gas furnace, so that the temperature of the bottom of the combustion cylinder is higher than that of the top of the combustion cylinder, and the heating runner preferably adopts an upper-in and lower-out mode, so that the utilization rate of combustion heat can be further improved.
In some embodiments, referring to fig. 1, the front end of the micro-pyrolysis section is provided with a first combustion gas duct 31 in communication with its inner cavity; the front end of the extrusion section is provided with a second combustion-supporting gas pipe 32 communicated with the inner cavity of the extrusion section; a spray pipe 33 is arranged between the micro-pyrolysis section and the second combustion-supporting gas pipe 32, and the spray pipe 33 is communicated with the inner cavity of the extrusion section. Because the amount of the pyrolysis gas generated in the rubber micro pyrolysis process does not have stability, in order to avoid insufficient combustion or flameout phenomenon when the amount of the pyrolysis gas is small, auxiliary combustion is performed by respectively introducing combustion-supporting gas into the front ends of the micro pyrolysis section and the extrusion section, the combustion-supporting gas can be specifically air, oxygen or natural gas, and can be directly air for saving cost, of course, self-combustible gas such as oxygen or natural gas can be used for improving the combustion heat value of the gas furnace (which is helpful for further reducing the heating power consumption of the preheating chamber 11, and the comprehensive cost is not greatly different from that of the mode of adopting air), the introduced combustion-supporting gas has the functions of assisting combustion, ensuring the combustion sufficiency of the pyrolysis gas, and accelerating the circulation speed of the pyrolysis gas by utilizing the gas pressure, thereby avoiding the accumulation of the pyrolysis gas in the twin-screw extruder 30 and improving the recycling rate of the pyrolysis gas.
In some embodiments, referring to fig. 1, a first range hood 61 is provided directly above the first combustion cylinder 41, a second range hood 62 is provided directly above the second combustion cylinder 51, flue gas discharge ends of the first range hood 61 and the second range hood 62 are commonly connected with a flue gas duct 63, the flue gas duct 63 communicates with a preheating chamber 11, and the preheating chamber 11 has an exhaust pipe 111 for extending below the liquid surface of the water container 70. The high-temperature flue gas generated by combustion can be directly discharged into the preheating chamber 11 through the flue gas pipelines 63 by two smoke ventilators, so that the screw conveyor 20 is preheated, the temperature of the screw conveyor 20 per se can be increased, and the heating effect of the heat conducting oil sleeve 21 on the mixed materials in the machine barrel is matched, so that the required plasticizing process temperature requirement of the mixed materials can be basically met, the heating power consumption of the preheating chamber 11 per se can be further reduced, and even the heating requirement of the screw conveyor 20 can be met without adopting a heating device of the preheating chamber 11 per se, so that the combustion heat of pyrolysis gas is fully utilized, and the processing cost is reduced; in addition, after the high-temperature flue gas enters the preheating chamber 11 to complete heat exchange (in a low-inlet and high-outlet mode), the flue gas is discharged into the water container 70 through the exhaust pipe 111, so that dust, tiny particles or carbon dioxide and the like in the flue gas can be dissolved in water, and the flue gas finally discharged into the atmosphere is cleaner and has better environmental protection effect.
In some embodiments, referring to fig. 3, the interiors of the first combustion bowl 41 and the second combustion bowl 51 are each provided with a core bowl 512 extending axially therealong, the core bowl 512 forming a flue gas passage with the interior wall of the first combustion bowl 41 or the second combustion bowl 51. The core barrel 512 is arranged to guide the high-temperature flue gas to be fully contacted with the barrel wall of the combustion barrel, so that the heat exchange rate of the high-temperature flue gas and the combustion barrel is improved, and the heat loss caused by the direct discharge of the high-temperature flue gas from the central position of the combustion barrel is avoided; of course, in order to further improve the heat utilization rate, the wall of the core barrel 512 is provided with an auxiliary hot runner 513 connected in series with the heating runner, when the high-temperature flue gas passes through the flue gas channel, the heat conduction oil can also flow through the auxiliary hot runner 513 to obtain a heating effect, and meanwhile, the flow path length of the heat conduction oil can also be improved, so that the heating time of the heat conduction oil is improved, the higher oil temperature can be obtained, and the heating power consumption of the preheating chamber 11 per se is reduced.
Based on the same inventive concept, referring to fig. 1 to 3, the embodiment of the present application further provides a method for processing rubber softening oil, including the following steps:
a first gas furnace 40 is arranged at the tail end of a micro pyrolysis section of the double-screw extruder 30, and a second gas furnace 50 is arranged at the tail end of an extrusion section; wherein, the air inlet pipe of the first gas furnace 40 is communicated with the inner cavity of the micro pyrolysis section, and the air inlet pipe of the second gas furnace 50 is communicated with the inner cavity of the extrusion section;
combustion-supporting gas is respectively introduced into the front end of the micro pyrolysis section and the front end of the extrusion section; wherein, most of combustion-supporting gas introduced into the micro-pyrolysis section is mixed with pyrolysis gas and then enters the first gas furnace 40 for combustion, and the rest enters the extrusion section and is mixed with combustion-supporting gas introduced into the extrusion section and then enters the second gas furnace 50 for combustion;
the heat generated by the combustion in the first gas furnace 40 and the second gas furnace 50 is used to heat the screw conveyor 20 in the preheating chamber 11.
Compared with the prior art, the rubber softening oil processing method provided by the invention has the advantages that the first gas furnace 40 is arranged at the tail end of the micro pyrolysis section of the double-screw extruder 30, combustion-supporting gas is introduced into the front end of the micro pyrolysis section, so that pyrolysis gas generated in the micro pyrolysis process of a rubber mixed material under the action of heat and force of the micro pyrolysis section can be mixed and burnt, a small part of pyrolysis gas which cannot directly enter the first gas furnace 40 enters the extrusion section along with the pyrolyzed material and is secondarily mixed with the combustion-supporting gas introduced into the front end of the extrusion section and enters the second gas furnace 50 at the tail end of the extrusion section for combustion treatment, and as combustion-supporting gas and pyrolysis gas are respectively introduced into the micro pyrolysis section and the extrusion section for primary mixing, the mixed gas can be combusted more fully after being secondarily mixed with air after entering the gas furnace, the smoke carbon content exceeding standard caused by insufficient combustion is avoided, the smoke generated by combustion can be ensured to meet the emission requirement, and the heat generated by the two combustion can be used for heating the screw conveyor 20 in the preheating chamber 11, so that the plasticizing powder material is heated, the heating device for reducing the power consumption of the heating oil in the screw conveyor 11 can be provided, and the processing cost of the heating device can be reduced for the heating oil in the screw conveyor device (20).
Specifically, the use of heat generated by combustion in the first gas furnace 40 and the second gas furnace 50 for heating the screw conveyor 20 in the preheating chamber 11 includes:
a first combustion cylinder 41 and a second combustion cylinder 51 are respectively arranged on the first gas furnace 40 and the second gas furnace 50, wherein a first heating flow passage 411 is arranged in the first combustion cylinder 41, a second heating flow passage 511 is arranged in the second combustion cylinder 51, and the first heating flow passage 411 and the second heating flow passage 511 are connected in series and are connected with a heat conduction oil sleeve 21 on the inner wall of the cylinder of the screw conveyor 20 to form a circulation heating loop;
a first range hood 61 and a second range hood 62 are respectively covered above the first combustion cylinder 41 and the second combustion cylinder 51; wherein, the fume discharge ends of the first fume exhaust fan 61 and the second fume exhaust fan 62 are communicated with the preheating chamber 11;
an exhaust pipe 111 is installed on the top wall of the preheating chamber 11, and the exhaust pipe 111 is led below the liquid surface of the water container 70;
spraying water is introduced into the front end of the extrusion section.
The first heating flow passage 411 and the second heating flow passage 511 connected in series can improve the overall heating path length of the heat conduction oil, so that the circulation heating time of the heat conduction oil in the combustion cylinder can be improved without changing the circulation heat exchange time of the heat conduction oil in the heat conduction oil jacket 21, the heat conduction oil can be maintained at a higher temperature, the heating effect on the screw conveyor 20 is improved, and the heating power consumption of the preheating chamber 11 is reduced; meanwhile, the high-temperature flue gas generated in the two gas furnaces is collected through the two range hoods and is introduced into the preheating chamber 11, so that heat loss caused by direct discharge of the high-temperature flue gas can be avoided, the heating effect of combustion heat generated by pyrolysis gas on the screw conveyor 20 can be further improved, and the heating power consumption of the preheating chamber 11 is reduced; in addition, by introducing a small amount of spray water into the front end of the extrusion section, the non-condensable gas or other organic volatile gases in the extrusion section can be taken away, so that the produced rubber softening oil is purer, meanwhile, the non-condensable gas is eliminated, the second gas furnace 50 can be combusted more fully, finally, the generated high-temperature flue gas is discharged into the water container 70 through the exhaust pipe 111 for water dissolution after heat exchange in the preheating chamber 11, and then is discharged, so that dust, tiny particles or carbon dioxide and the like in the flue gas are dissolved in water, the flue gas finally discharged into the atmosphere is cleaner, carbon emission can be reduced, and the processing environment friendliness is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. Rubber softening oil processingequipment, its characterized in that includes:
the preheating chamber is arranged on the rack;
the screw conveyor is arranged on the frame, is positioned in the preheating chamber and is used for plasticizing, extruding and discharging mixed powder under the condition of set temperature, and a heat-conducting oil sleeve is inlaid on the inner wall of a machine barrel of the screw conveyor;
the double-screw extruder is arranged on the frame, the feeding end of the double-screw extruder is connected with the discharging end of the screw conveyor, and the double-screw extruder is used for micro-pyrolyzing the plasticized mixed powder under the condition of a set temperature, extruding and kneading the mixed material of rubber hydrocarbon and carbon black after micro-pyrolysis to form softened oil, and discharging the softened oil;
the first gas furnace is arranged on the side wall of the discharge end of the double-screw extruder, and an air inlet pipe of the first gas furnace is communicated with the inner cavity of the double-screw extruder and is used for burning pyrolysis gas generated in the double-screw extruder;
the first combustion cylinder is arranged right above the first gas furnace, a first heating flow passage is arranged in the cylinder wall of the first combustion cylinder, a liquid inlet and a liquid outlet of the first heating flow passage are correspondingly communicated with a liquid outlet and a liquid inlet of the heat conducting oil sleeve through oil pipes respectively, and a circulating pump is arranged on the oil pipes in a series manner;
the first half section of the double-screw extruder is a micro-pyrolysis section, the second half section is an extrusion section, wherein the first gas furnace is arranged at the tail end of the micro-pyrolysis section, a second gas furnace is arranged at the tail end of the extrusion section, a second combustion cylinder is arranged on the second gas furnace, a second heating flow passage is arranged in the cylinder wall of the second combustion cylinder, and the second heating flow passage is connected with the first heating flow passage in series;
the front end of the micro pyrolysis section is provided with a first combustion-supporting gas pipe communicated with the inner cavity of the micro pyrolysis section; the front end of the extrusion section is provided with a second combustion-supporting gas pipe communicated with the inner cavity of the extrusion section; a spray pipe is arranged between the micro pyrolysis section and the second combustion-supporting gas pipe, and the spray pipe is communicated with the inner cavity of the extrusion section;
a first range hood is arranged right above the first combustion cylinder, a second range hood is arranged right above the second combustion cylinder, the smoke discharge ends of the first range hood and the second range hood are connected with a smoke pipeline together, the smoke pipeline is communicated with the preheating chamber, and the preheating chamber is provided with an exhaust pipe which is used for extending into the lower part of the liquid level of the water container;
the liquid inlet of the first heating runner is communicated with the liquid outlet of the second heating runner, the liquid outlet of the first heating runner is communicated with the liquid inlet of the heat conducting oil sleeve, and the liquid inlet of the second heating runner is communicated with the liquid outlet of the heat conducting oil sleeve;
the first heating runner and the second heating runner are both in spiral winding structures, and the heat conducting oil sleeve is internally provided with spiral oil holes in spiral winding structures.
2. The apparatus according to claim 1, wherein the first combustion cylinder and the second combustion cylinder are each provided with a core cylinder extending in an axial direction thereof, and a flue gas passage is formed between the core cylinder and an inner wall of the first combustion cylinder or the second combustion cylinder.
3. A method for processing a rubber softening oil, characterized by being applied to the rubber softening oil processing apparatus according to any one of claims 1 to 2, comprising the steps of:
a first gas furnace is arranged at the tail end of a micro pyrolysis section of the double-screw extruder, and a second gas furnace is arranged at the tail end of an extrusion section; the air inlet pipe of the first gas furnace is communicated with the inner cavity of the micro pyrolysis section, and the air inlet pipe of the second gas furnace is communicated with the inner cavity of the extrusion section;
combustion-supporting gas is respectively introduced into the front end of the micro pyrolysis section and the front end of the extrusion section; the combustion-supporting gas introduced into the micro pyrolysis section is mixed with pyrolysis gas, and then most of the combustion-supporting gas enters the first gas furnace for combustion, and the rest of the combustion-supporting gas enters the extrusion section and is mixed with the combustion-supporting gas introduced into the extrusion section and then enters the second gas furnace for combustion;
and using heat generated by combustion in the first gas furnace and the second gas furnace to heat the screw conveyer in the preheating chamber.
4. A method of processing a rubber softening oil in accordance with claim 3, wherein said utilizing heat generated by combustion in said first gas furnace and said second gas furnace for heating a screw conveyor in a preheating chamber comprises:
a first combustion cylinder and a second combustion cylinder are respectively arranged on the first gas furnace and the second gas furnace, wherein a first heating flow passage is arranged in the first combustion cylinder, a second heating flow passage is arranged in the second combustion cylinder, and the first heating flow passage and the second heating flow passage are connected in series and are connected with a heat conduction oil sleeve on the inner wall of a machine barrel of the screw conveyor to form a circulating heating loop;
a first range hood and a second range hood are respectively covered above the first combustion cylinder and the second combustion cylinder; the smoke discharge ends of the first smoke ventilator and the second smoke ventilator are communicated with the preheating chamber;
an exhaust pipe is arranged on the top wall of the preheating chamber and is led into the water container below the liquid level.
5. The method of processing rubber softening oil in accordance with claim 4, wherein said utilizing heat generated by combustion in said first gas furnace and said second gas furnace for heating the screw conveyor in the preheating chamber further comprises:
and spraying water is introduced into the front end of the extrusion section.
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| US8020499B2 (en) * | 2007-11-09 | 2011-09-20 | Overseas Capital Assets Limited | Apparatus and method for pyrolysis of scrap tyres and the like |
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| CN103589445A (en) * | 2013-11-26 | 2014-02-19 | 杨金国 | Harmless continuous pyrolyzing device for waste tire powder |
| WO2021063961A1 (en) * | 2019-09-30 | 2021-04-08 | Reoil Sp. Z O.O. | Installation for the production and a method of producing oil, gas and char for a coal black from elastomers, especially rubber waste, in the process of continuous pyrolysis |
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