CN215592995U - Rubber softening oil processing system - Google Patents

Abstract

The utility model provides a rubber softening oil processing system which comprises a rack, a screw conveyor and a double-screw extruder which are arranged on the rack, a gas furnace and a heat collection assembly, wherein the gas furnace is arranged on the rack; a preheating chamber is arranged on the frame; the screw conveyor is positioned in the preheating chamber and used for plasticizing, extruding and discharging the mixed powder under the condition of set temperature; the feeding end of the double-screw extruder is connected with the discharging end of the screw conveyer and is used for micro-pyrolyzing the plasticized mixed powder under the condition of set temperature and discharging the formed softening oil; the gas furnace is arranged on the side wall of the discharge end of the double-screw extruder, and a gas inlet pipe of the gas furnace is communicated with the inner cavity of the double-screw extruder and is used for combusting pyrolysis gas generated in the double-screw extruder; the heat collecting assembly is arranged right above the gas furnace and used for collecting and discharging high-temperature flue gas into the preheating chamber. The rubber softening oil processing system provided by the utility model can improve the environmental protection of processing softening oil by adopting waste rubber and reduce the processing cost.

Description

Rubber softening oil processing system

Technical Field

The utility model belongs to the technical field of rubber recycling, and particularly relates to a rubber softening oil processing system.

Background

The softening oil is needed to be used in the processing process of regenerated rubber to improve the performance of rubber, the aromatic oil with the largest dosage in the rubber softening oil is aromatic oil, the common aromatic oil contains more polycyclic aromatic hydrocarbon, and the polycyclic aromatic hydrocarbon has harmful properties of carcinogenesis, teratogenesis and the like, so the polycyclic aromatic hydrocarbon content in a rubber product must be strictly controlled. The main equipment for processing the softening oil from the waste rubber at present is a double-screw extruder, the double screw extruder is provided with different functional modules such as a conical forced feeding section, an extruding and shearing section and an extruding section, the working temperature of the double-screw extruder is controlled to be 280-350 ℃ by heating and cooling means, so that the rubber powder is subjected to micro pyrolysis under the action of heat and force, thereby obtaining the softening oil, pyrolysis gas can be generated in the micro pyrolysis process of the rubber, although the hazard of the pyrolysis gas generated by adopting the process is extremely small, the direct emptying mode is still not beneficial to environmental protection, in addition, as the rubber powder, a micro pyrolysis catalyst, an activating agent and the like need to be mixed in proportion before being sent into the double-screw extruder, and the mixed powder is subjected to plasticizing treatment under the temperature environment of about 100 ℃, a preheating chamber needs to be additionally arranged to heat the mixed powder, so that the whole process has extremely high demand on heat, therefore, the softening oil obtained by processing the waste rubber has high cost, and the operation burden of enterprises is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a processing system of rubber softening oil, aiming at improving the environmental protection of processing softening oil by adopting waste rubber and reducing the processing cost.

In order to achieve the purpose, the utility model adopts the technical scheme that: the rubber softening oil processing system comprises a frame, a screw conveyor, a double-screw extruder, a gas furnace and a heat collection assembly; wherein, a preheating chamber is arranged on the frame; the screw conveyor is arranged on the rack, is positioned in the preheating chamber and is used for plasticizing and extruding the mixed powder under the condition of set temperature and discharging the plasticized mixed powder; 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 conveyer and used for micro-pyrolyzing the plasticized mixed powder under the set temperature condition and discharging the softened oil; the gas furnace is arranged on the side wall of the discharge end of the double-screw extruder, and a gas inlet pipe of the gas furnace is communicated with the inner cavity of the double-screw extruder and is used for combusting pyrolysis gas generated in the double-screw extruder; the heat collection assembly is arranged right above the gas furnace and used for collecting high-temperature flue gas generated by the gas furnace and discharging the high-temperature flue gas into the preheating chamber.

In a possible implementation mode, the first half section of the double-screw extruder is a micro pyrolysis section, the second half section of the double-screw extruder is an extrusion section, wherein the tail ends of the micro pyrolysis section and the extrusion section are respectively provided with a gas furnace, and the heat collection assembly is provided with two smoke collection ends which are respectively positioned right above the two gas furnaces.

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.

In some embodiments, 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.

Illustratively, a stop valve is arranged on the spray pipe, a first gas flow valve is arranged on the first combustion-supporting gas pipe, and a second gas flow valve is arranged on the second combustion-supporting gas pipe.

In some embodiments, the heat collection assembly comprises two range hoods and a flue gas pipeline; wherein, the two range hoods are respectively covered and arranged right above one of the gas furnaces; the gas inlet end of the flue gas pipeline is respectively connected with the flue gas discharge ends of the two range hoods, and the gas outlet end of the flue gas pipeline is connected with the preheating chamber.

Illustratively, the flue gas pipeline is a high-temperature-resistant heat insulation pipe, and the preheating chamber is formed by enclosing a high-temperature-resistant heat insulation plate.

For example, the preheating chamber is provided with an exhaust pipe, one end of which is used for extending into the water container below the liquid level.

In one possible embodiment, the drive of the screw conveyor is located outside the preheating chamber, and the feed opening of the screw conveyor projects upwards above the preheating chamber.

The rubber softening oil processing system provided by the utility model has the beneficial effects that: compared with the prior art, according to the processing system for the rubber softening oil, provided by the utility model, the pyrolysis gas generated in the micro pyrolysis process of the plasticized mixed powder under the action of heat and force of the double-screw extruder can be mixed with air in the gas furnace and then combusted, and the high-temperature flue gas generated by combustion is collected by the heat collection assembly above the gas furnace and discharged into the preheating chamber, so that the screw conveyor in the preheating chamber is subjected to auxiliary heating, the heating power consumption of the screw conveyor in the preheating chamber (an internal heating device) can be reduced, the processing cost of the softening oil is reduced, and in addition, the trace harmful ingredients in the pyrolysis gas can be decomposed by performing combustion treatment on the pyrolysis gas, so that the flue gas generated by combustion meets the requirement of environmental protection and emission.

Drawings

FIG. 1 is a schematic structural diagram of a rubber softening oil processing system according to an embodiment of the present invention.

In the figure: 1. a frame; 10. a preheating chamber; 101. an exhaust pipe; 2. a screw conveyor; 20. a feed inlet; 3. a twin screw extruder; 31. a first combustion supporting gas pipe; 311. a first gas flow valve; 32. a second combustion supporting gas pipe; 321. a second gas flow valve; 33. a shower pipe; 331. a stop valve; 4. a gas furnace; 5. a heat collection assembly; 51. a range hood; 52. a flue gas duct; 6. a water container.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the utility model and are not intended to limit the utility model.

It should be noted that the rubber softening oil processing system provided by the utility model can be used for processing and producing rubber softening oil, can also be used for producing liquid reclaimed rubber by changing process parameters such as temperature and pressure, and has good treatment effect on pyrolysis gas in the production process of the liquid reclaimed rubber.

Referring to fig. 1, a rubber softening oil processing system according to the present invention will now be described. The rubber softening oil processing system comprises a frame 1, a screw conveyor 2, a double-screw extruder 3, a gas furnace 4 and a heat collection assembly 5; wherein, a preheating chamber 10 is arranged on the frame 1; the screw conveyor 2 is arranged on the frame 1, is positioned in the preheating chamber 10 and is used for plasticizing, extruding and discharging the mixed powder under the condition of a set temperature; the double-screw extruder 3 is arranged on the frame 1, and the feeding end of the double-screw extruder is connected with the discharging end of the screw conveyor 2 and used for micro-pyrolyzing the plasticized mixed powder under the set temperature condition and discharging the softened oil; the gas furnace 4 is arranged on the side wall of the discharge end of the double-screw extruder 3, and a gas inlet pipe of the gas furnace 4 is communicated with the inner cavity of the double-screw extruder 3 and is used for burning pyrolysis gas generated in the double-screw extruder 3; the heat collecting assembly 5 is arranged right above the gas furnace 4 and used for collecting high-temperature flue gas generated by the gas furnace 4 and discharging the high-temperature flue gas into the preheating chamber 10.

It should be noted that the process and technology of forming softening oil by the force action of the double screw extruder of the mixed powder under a certain temperature environment are prior art, and are not described herein again, in the working process of the double screw extruder 3, the pyrolysis gas can be extruded together with the material and move towards the discharge end of the double screw extruder 3, when reaching the position of the gas furnace 4, most of the pyrolysis gas can enter the gas furnace 4 to be mixed and combusted with air, and only a small part of the pyrolysis gas can be discharged together with the formed softening oil from the discharge end; in addition, in the process of implementing the utility model, the pyrolysis gas generated in the pyrolysis process is found to be flammable, and the smoke generated after combustion meets the requirement of environmental protection emission through detection; furthermore, as in the prior art, the casing of the twin-screw extruder 3 should be provided with a conventional heating source, such as an electric heating plate/tube, an electromagnetic heating plate, and the preheating chamber 10 is also provided with a conventional heating source.

The embodiment provides a rubber softening oil processing system, compared with the prior art, plasticized mixed powder is at double screw extruder 3's heat, the pyrolysis gas that little pyrolysis in-process produced under the effect of force can burn after mixing with the air in gas furnace 4, the high temperature flue gas that the burning produced is collected by heat collecting assembly 5 of gas furnace 4 top and is gone into preheating chamber 10 in, thereby carry out the auxiliary heating to screw conveyer 2 that is located preheating chamber 10, can reduce the heating power dissipation of preheating chamber 10 (the heating device of establishing) itself to screw conveyer 2, thereby reduce the processing cost of softening oil, in addition, through carrying out combustion treatment to pyrolysis gas, can decompose the trace harmful component in the pyrolysis gas, thereby the flue gas that makes the burning produce satisfies environmental protection emission requirement.

In some embodiments, referring to fig. 1, the first half of the twin-screw extruder 3 is a micro-pyrolysis section, and the second half is an extrusion section, wherein the ends of the micro-pyrolysis section and the extrusion section are provided with gas burners 4, and the heat collecting assembly 5 has two smoke collecting ends respectively located right above the two gas burners 4. It should be understood that the rubber will generate pyrolysis gas only in the process of micro pyrolysis, and will form a mixture containing rubber hydrocarbon and carbon black after passing through the micro pyrolysis section, and this mixture will form a paste-like softening oil through repeated extrusion, kneading and shearing actions of the extrusion section, that is, the main generation position of pyrolysis gas is in the pyrolysis section, and no pyrolysis gas will be generated after entering the extrusion section, so two gas burners 4 are respectively arranged at the end of the micro pyrolysis section and the extrusion section, so that most pyrolysis gas can directly enter the first gas burner 4 for combustion before entering the extrusion section, and the rest part of pyrolysis gas enters the extrusion section and then reaches the discharge end of the twin-screw extruder 3 and is discharged into the second gas burner 4 for combustion, thereby almost all pyrolysis gas can be burned, and then improve the feature of environmental protection of course of working to the high temperature flue gas by two gas furnace 4 exhaust all can discharge into preheating chamber 10 through thermal-arrest subassembly 5 in, thereby can make full use of the heat that the burning was handled the pyrolysis gas and is produced, avoid calorific loss, reduction production energy consumption.

Because the combustion stability of the pyrolysis gas is poor and the output of the pyrolysis gas is unstable, the flame-out phenomenon is easily generated when the pyrolysis gas is simply used as fuel for combustion, so that the pyrolysis gas is directly discharged into the preheating chamber 10 through the heat collecting assembly 5 and then into the atmosphere, the environmental protection is affected, and in order to avoid the phenomenon, in the embodiment, the front end of the micro pyrolysis section is provided with a first combustion-supporting gas pipe 31 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 32 communicated with the inner cavity of the extrusion section. The combustion-supporting gas can be oxygen, natural gas or air (air can be directly adopted for reducing cost), the first combustion-supporting gas pipe 31 and the second combustion-supporting gas pipe 32 discharge the combustion-supporting gas into a pyrolysis section and an extrusion section to be called as primary air, the primary air is mixed with the pyrolysis gas and then enters the gas furnace 4, the mixture is sprayed out of a combustion hole and then is mixed with outside air (called as secondary air) to be ignited, the combustion is more sufficient, the combustion heat value is higher, the combustion flue gas temperature can be increased, the heating effect of high-temperature flue gas on the preheating chamber 10 is further improved, and the energy consumption is favorably reduced; in addition, fill the air to the 3 inner chambers of double screw extruder through two combustion-supporting gas pipes, can also improve pyrolysis gas in the inside flow velocity of double screw extruder 3 to accelerate pyrolysis gas's emission, avoid pyrolysis gas to remain or the siltation in double screw extruder 3 is inside.

Further, 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. Shower 33 can spray appropriate amount of water on the mixed material that forms after the pyrolysis is accomplished, the part can not get into pyrolysis section terminal gas furnace 4 and carry out the pyrolysis gas that the processing was burnt and meet water infiltration evaporation, and take away the organic volatile gas that extrudes in the section and get into and extrude section terminal gas furnace 4 and burn, aim at improving pyrolysis gas's treatment effect here through increasing shower 33, avoid pyrolysis gas direct evacuation and produce the environmental protection problem, also can effectively reduce the peculiar smell of rubber softening oil, and further reduce the content of substances such as noxious polycyclic aromatic hydrocarbon.

For example, a stop valve 331 is disposed on the shower pipe 33, a first gas flow valve 311 is disposed on the first combustion supporting gas pipe 31, and a second gas flow valve 321 is disposed on the second combustion supporting gas pipe 32. The shower water only need open when necessary through stop valve 331 can, and need not normally open and water waste, the gas flow in two combustion-supporting gas pipes also can be controlled respectively through two flow valves, because pyrolysis gas mainly concentrates on in the pyrolysis section, consequently it is usually that the flow that first combustion-supporting gas pipe 31 needs is big, the flow that second combustion-supporting gas pipe 32 needs is little, can guarantee the burning sufficiency of pyrolysis gas in gas furnace 4 through the aperture of reasonable two flow valves of adjusting, thereby ensure that the flue gas satisfies the environmental protection requirement, can also improve the flue gas temperature simultaneously, in order to improve the heating effect of high temperature flue gas to preheating chamber 10, reduce the heating cost.

As a specific embodiment of the heat collecting assembly 5, please refer to fig. 1, the heat collecting assembly 5 includes two range hoods 51 and a flue gas duct 52; wherein, the two smoke ventilators 51 are respectively covered and arranged right above one of the gas furnaces 4; the inlet end of the flue gas pipeline 52 is respectively connected with the flue gas discharge ends of the two range hoods 51, and the outlet end is connected with the preheating chamber 10.

Specifically, the flue gas duct 52 is a high temperature resistant heat insulation pipe, and the preheating chamber 10 is enclosed by high temperature resistant heat insulation boards. Two lampblack absorbers 51 can produce the negative pressure and collect the high temperature flue gas that gas furnace 4 produced to flue gas pipeline 52 in, avoid high temperature flue gas to leak and lead to calorific loss, and flue gas pipeline 52 and preheating chamber 10 all adopt high temperature resistant insulation material simultaneously, can avoid the heat to external loss to can improve heat utilization and rate, reduce the heating cost of preheating chamber 10.

Certainly, the high-temperature flue gas needs to be discharged from the preheating chamber 10 after entering the preheating chamber 10 for heat exchange, and since there are some substances which are not beneficial to environmental protection, such as dust, impurities, carbon dioxide, etc., in the high-temperature flue gas, referring to fig. 1, in order to improve the environmental protection effect, the preheating chamber 10 is provided with an exhaust pipe 101, and one end of the exhaust pipe 101 is used for extending into the position below the liquid level of the water container 6. It should be understood that according to the principle of hot-down and cold-up entering and exiting, the flue gas duct 52 should be communicated with the bottom of the preheating chamber 10, and the exhaust pipe 101 is communicated with the top of the preheating chamber 10, so as to enable the high-temperature flue gas to form up-down convection in the preheating chamber 10, improve the heating effect, and the exhaust pipe 101 directly discharges the flue gas to below the liquid level of the water container 6, so as to enable substances such as dust, impurities and carbon dioxide to be dissolved in water, thereby reducing carbon emission and improving the environmental protection of production.

In some embodiments, referring to fig. 1, the driving mechanism of the screw conveyor 2 is located outside the preheating chamber 10, and the feed port 20 of the screw conveyor 2 extends upward and above the preheating chamber 10. Since the temperature in the preheating chamber 10 is high (above 100 ℃), and the driving mechanism of the screw conveyor 2 is usually a motor or a motor, and the driving mechanism is liable to reduce the service life and even burn out when operating in a high-temperature environment, the driving mechanism of the screw conveyor 2 is arranged outside the preheating chamber 10, so that the operating stability and the service life of the driving mechanism can be improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A rubber softening oil processing system, comprising:

the device comprises a rack, wherein a preheating chamber is arranged on the rack;

the screw conveyor is arranged on the rack, is positioned in the preheating chamber and is used for plasticizing, extruding and discharging the mixed powder under the condition of set temperature;

the double-screw extruder is arranged on the rack, the feeding end of the double-screw extruder is connected with the discharging end of the screw conveyer, and the double-screw extruder is used for micro-pyrolyzing the plasticized mixed powder under the condition of set temperature and discharging the formed rubber softening oil;

the gas furnace is arranged on the side wall of the discharge end of the double-screw extruder, and a gas inlet pipe of the gas furnace is communicated with an inner cavity of the double-screw extruder and is used for burning pyrolysis gas generated in the double-screw extruder;

and the heat collection assembly is arranged right above the gas furnace and used for collecting high-temperature flue gas generated by the gas furnace and discharging the high-temperature flue gas into the preheating chamber.

2. The system of claim 1, wherein the first half of the twin screw extruder is a micro pyrolysis section and the second half of the twin screw extruder is an extrusion section, wherein the gas burners are disposed at the ends of the micro pyrolysis section and the extrusion section, and the heat collecting assembly has two smoke collecting ends respectively disposed directly above the two gas burners.

3. The system of claim 2, wherein the micro-pyrolysis section has a first combustion gas pipe at the front end thereof, the first combustion gas pipe communicating with the inner cavity of the micro-pyrolysis section.

4. The system of claim 3, wherein 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.

5. The rubber softening oil processing system of claim 4, wherein 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.

6. The system of claim 5, wherein the shower pipe is provided with a stop valve, the first combustion-supporting gas pipe is provided with a first gas flow valve, and the second combustion-supporting gas pipe is provided with a second gas flow valve.

7. The rubber softening oil processing system of claim 2, wherein the heat collection assembly comprises:

the two range hoods are respectively covered over one of the gas furnaces;

and the gas inlet end of the smoke pipeline is respectively connected with the smoke discharge ends of the two smoke ventilators, and the gas outlet end of the smoke pipeline is connected with the preheating chamber.

8. The rubber softening oil processing system of claim 7, wherein the flue gas duct is a high temperature resistant heat insulation pipe, and the preheating chamber is enclosed by high temperature resistant heat insulation plates.

9. The rubber softening oil processing system of claim 7, wherein the preheating chamber is provided with an exhaust pipe, and one end of the exhaust pipe is used for extending into the water container below the liquid level.

10. The rubber softening oil processing system of any one of claims 1-9, wherein the drive mechanism of the screw conveyor is located outside the preheating chamber, and the feed port of the screw conveyor extends upward above the preheating chamber.

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