Online refining equipment for thermal cracking mixed oil

Abstract

The utility model provides on-line refining equipment for thermal cracking mixed oil, which belongs to the technical field of thermal cracking treatment of waste rubber and plastic and comprises a distillation kettle, a fractionating tower, a flash tower and a heating furnace body, a gas inlet of the distillation kettle is connected with a rear sealing bin of the thermal connection reaction kettle; the fractionating tower is connected with the distillation kettle through a fractionating tower light component inlet formed in the upper part of the fractionating tower and a distillation kettle light component outlet formed in the top of the distillation kettle; the flash tower is connected with the distillation kettle through a distillation kettle heavy oil outlet formed in the lower part of the distillation kettle, and the flash tower is connected with the fractionating tower through a flash tower diesel component outlet formed in the upper part of the flash tower and a fractionating tower heavy component inlet formed in the lower part of the fractionating tower. The device solves the technical problems that the existing thermal cracking mixed oil cannot be continuously treated on line, the energy consumption is high, and the impurity removal rate is poor, and has the characteristics that the thermal cracking mixed oil can be synchronously refined on line, the impurities are effectively removed, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal cracking treatment of waste rubber and plastics, and in particular relates to an online refining device for thermal cracking mixed oil. Background Art

[0002] Recycling scrap tires not only alleviates environmental pressure and reduces pollution, but also enables efficient resource recovery. Current methods for processing scrap tires include prototype modification, production of recycled rubber and rubber powder, incineration, and pyrolysis. Pyrolysis technology holds great potential for treating scrap tires. It involves thermally decomposing scrap tires in an oxygen-deficient or inert atmosphere, producing pyrolysis gas, pyrolysis oil, and charcoal residue. These products can be further processed into high-value products with a variety of applications.

[0003] After being crushed, waste rubber and plastic enter the pyrolysis reactor through the feed port. High-temperature flue gas is introduced into the reactor's external heating chamber, heating the material to a specific temperature. Under positive or negative pressure, pyrolysis or thermal cracking occurs. This process involves heating at high temperatures in the absence or absence of oxygen, breaking down the rubber's polymers into monomers, dimers, and fragments. These fragments are then converted into storable fuel oil, pyrolysis gas, steel wire, and pyrolysis-regenerated carbon black. The storable fuel oil can be further processed and converted into usable, high-value products.

[0004] However, existing pyrolysis mixed oils often cannot be processed online continuously, and have problems such as high energy consumption and poor impurity removal rate. Utility Model Content

[0005] The details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

[0006] The utility model proposes an online refining device for pyrolysis mixed oil, which solves the technical problems that the existing pyrolysis mixed oil cannot be processed online continuously, has high energy consumption and poor impurity removal rate. It has the characteristics of being able to realize the refining of pyrolysis mixed oil online synchronously, effectively remove impurities and reduce energy consumption.

[0007] The utility model discloses an online refining device for thermal cracking mixed oil, comprising a still, a fractionating tower, a flash tower, and a heating furnace body; the air inlet of the still, is connected to a rear sealed chamber of a thermally connected reactor; the fractionating tower is connected to the still via a fractionating tower light component inlet arranged at the upper part of the fractionating tower and a still light component outlet arranged at the top of the still; the flash tower is connected to the still via a still heavy oil outlet arranged at the lower part of the still, and the flash tower is connected to the still via a flash tower diesel component outlet arranged at the upper part of the flash tower and a fractionating tower heavy component inlet arranged at the lower part of the still; the heating furnace body is wrapped outside the still, and utilizes non-condensable gas output and generated by the fractionating tower as fuel, which is burned by a still burner to provide heat for the still.

[0008] In some embodiments, the online refining equipment for pyrolysis mixed oil further includes a diesel vapor condenser connected to the distillation tower via a diesel outlet of the distillation tower disposed in the middle of the distillation tower, and a diesel buffer tank connected to the diesel vapor condenser.

[0009] In some embodiments, the online refining equipment for pyrolysis mixed oil also includes a gas separation bag connected to the diesel buffer tank, and a water seal tank connected to the gas separation bag, and part of the non-condensable gas output from the gas outlet of the water seal tank is input into the heating furnace body as fuel.

[0010] In some embodiments, the diesel steam condenser includes a diesel steam primary condenser connected to the distillation tower, and a diesel steam secondary condenser connected to the diesel steam primary condenser, and the diesel steam secondary condenser is connected to the diesel cache tank.

[0011] In some embodiments, the online refining equipment for pyrolysis mixed oil further includes a light component cooler connected to the fractionation tower via a fractionation tower gasoline outlet disposed at an upper portion of the fractionation tower, and a gasoline collection tank connected to the light component cooler.

[0012] In some embodiments, the online refining equipment for pyrolysis mixed oil also includes a steam heating boiler for providing heat to the distillation tower, and the steam heating boiler includes a steam heating boiler burner, and the steam heating boiler burner uses part of the non-condensable gas output from the outlet of the water seal tank as fuel.

[0013] In some embodiments, the online refining equipment for pyrolysis mixed oil also includes a molten salt heating furnace for providing heat to the flash tower, and the molten salt heating furnace includes a molten salt heating furnace burner, and the molten salt heating furnace burner uses part of the non-condensable gas output from the gas outlet of the water seal tank as fuel.

[0014] In some embodiments, the steam heating boiler burner inputs superheated steam into the molten salt tank of the molten salt heating furnace through a hot steam delivery pipeline to heat the molten salt in the molten salt tank, and then is connected to the distillation tower through a pipeline.

[0015] In some embodiments, the online refining equipment for the thermal cracking mixed oil further comprises a tubular cooler connected to a flash tower heavy component outlet disposed at the bottom of the flash tower.

[0016] In some embodiments, the online refining equipment for thermal cracking mixed oil further includes a heavy oil tank connected to the tubular cooler.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model provides an online refining device for pyrolysis mixed oil. The oil vapor separated after pyrolysis is about 250°C and enters the distillation kettle directly online without condensation. After the temperature is slightly increased to about 300°C, the light components in the oil product can be separated and sent to a distillation tower for further processing, which greatly reduces the energy consumption of reheating after condensation. At the same time, the heavy components enter the flash tower for further processing, effectively removing impurities, ensuring the quality of the oil product, and realizing the online synchronous pyrolysis mixed oil refining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of an online refining device for pyrolysis mixed oil provided in an embodiment of the present utility model;

[0021] In the above figures: 1. Distillation kettle; 2. Distillation tower; 3. Flash tower; 4. Heating furnace body; 5. Diesel steam condenser; 6. Diesel buffer tank; 7. Gas bag; 8. Water seal tank; 9. Light component cooler; 10. Gasoline collection tank; 11. Steam heating boiler; 12. Molten salt heating furnace; 13. Molten salt tank; 14. Tubular cooler; 15. Heavy oil tank; 16. Rear sealed warehouse. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] The embodiment of the utility model provides an online refining device for pyrolysis mixed oil. Figure 1 This is a schematic diagram of the structure of the online refining equipment for pyrolysis mixed oil according to an embodiment of the present invention. Figure 1 As shown, the online refining equipment for thermal cracking mixed oil includes a still 1, a fractionating tower 2, a flash tower 3, and a heating furnace body 4; the air inlet of the still 1 is connected to the rear sealed chamber 16 of the thermally connected reactor; the fractionating tower 2 is connected to the still 1 through a light component inlet of the fractionating tower 2 arranged at the upper part of the fractionating tower 2, and a light component outlet of the still 1 arranged at the top of the still 1; the flash tower 3 is connected to the still 1 through a heavy oil outlet of the still 1 arranged at the lower part of the still 1, and the flash tower 3 is connected to the fractionating tower 2 through a diesel component outlet of the flash tower 3 arranged at the upper part of the flash tower 3, and a heavy component inlet of the fractionating tower 2 arranged at the lower part of the fractionating tower 2; the heating furnace body 4 is wrapped outside the still 1, and uses the non-condensable gas output and generated by the fractionating tower 2 as fuel, which is burned by the burner of the still 1 to provide heat for the still 1. After the pyrolysis is completed, the oil vapor separated is at about 250°C. It is not condensed but directly enters the distillation kettle 1 online. After the temperature is slightly increased to about 300°C, the light components in the oil can be separated and sent to the distillation tower 2 for further processing, which greatly reduces the energy consumption of reheating after condensation. At the same time, the heavy components enter the flash tower 3 for further processing, effectively removing impurities, ensuring the quality of the oil, and realizing the online synchronous pyrolysis mixed oil refining.

[0024] In some embodiments, the online refining equipment for thermal cracking mixed oil further includes a light component cooler 9 connected to the distillation tower 2 via a gasoline outlet of the distillation tower 2 disposed at the upper portion of the distillation tower 2, and a gasoline collecting tank 10 connected to the light component cooler 9.

[0025] The above-mentioned still 1 is a pre-steamer for the mixed oil. The temperature within the still is generally controlled at around 300°C. The light components and water in the mixed oil are first distilled out, and the heavy components are then distilled into the flash tower 3 for distillation. The oil vapor separated after thermal cracking enters the rear sealed chamber 16, where it is connected to a high-temperature oil vapor delivery pipeline via a high-temperature oil vapor outlet and then fed into the oil inlet of the still 1. The still 1 is enclosed within a heating furnace body 4. The exhaust pipe of the heating furnace is vertically positioned on the upper left side of the furnace body, and the exhaust flue gas is transported to an external location for treatment and emission standards. Four burners are evenly distributed on the front of the lower portion of the heating furnace body 4, using the separated pyrolysis dry gas to heat the still 1. The still 1 has an oil inlet located at the top of the still 1 body. A remote temperature sensor is located on the upper right side of the still 1 body, which is interlocked with the burner to control the temperature within the still 1. A remote pressure sensor is located on the upper right side of the still 1 body, which is connected to the light component outlet of the fractionating tower 2 via a light component delivery pipeline. A magnetic flap level gauge is installed on the left end cap of distillation kettle 1, while a spherical side-mounted level gauge is installed on the right end cap of the kettle. These dual level gauges are designed to prevent accidents caused by malfunction of either gauge. A heavy oil and gas outlet is located at the bottom of the right end cap of distillation kettle 1, connected to the inlet of the heavy oil and gas export pump. The outlet of the heavy oil and gas export pump is connected to the oil vapor inlet of flash column 3 via a heavy oil transfer pipeline. A sewage outlet is located on the right side of the lower part of the kettle.

[0026] The primary function and principle of Flash Tower 3 is to rapidly vaporize the heavy components in the pyrolysis mixed oil through rapid distillation, thereby purifying the mixed oil and separating the residual oil. Flash Tower 3 utilizes molten salt heating, with the temperature within the tower generally controlled at around 450°C. The distilled residual oil is then sent to the next cooling and recovery process via the residual oil outlet at the bottom of the tower. The oil vapor inlet of Flash Tower 3 is vertically located on the upper left side of the tower, while the diesel component outlet is vertically located on the upper right side of the tower. These outlets are connected to the diesel component inlet of Fractionation Tower 2 via a high-temperature oil vapor outlet pipe.

[0027] The main function of fractionating tower 2 is to separate the different components in crude oil. By heating crude oil to evaporate it, and then utilizing the boiling point difference of different components, condensation and re-evaporation are carried out on the tower plates at different heights in the tower, thereby realizing the separation of light and heavy components, so that oil products of different uses can be obtained, such as gasoline, diesel, etc. The lower left side of fractionating tower 2 is provided with a heavy component inlet, and three layers of diesel catalyst are provided upwards. The middle right side of fractionating tower 2 is provided with a diesel outlet, which is connected to the diesel vapor outlet connecting pipeline of fractionating tower 2 and the diesel vapor outlet connecting pipeline of fractionating tower 2, and is connected to the diesel vapor primary condenser inlet. The light component inlet of fractionating tower 2 is arranged on the upper left side of the tower body, and two layers of gasoline purification fillers are provided upwards in sequence. The gasoline outlet of fractionating tower 2 is arranged on the upper right side of the tower body and is connected to the light component cooler 9 inlet. The lower right side of the light component cooler 9 is provided with a gasoline cooler outlet. The collected condensed oil enters the gasoline collecting tank 10 through the oil pipeline for storage. The oil outlet is arranged on the lower part of the tank body and is connected to the external oil pump to transport the cooling oil to the external storage tank for storage. A remote temperature sensor is installed at the top of the fractionating tower 2, which is interlocked with the steam heating boiler 11 using a burner to control the temperature inside the tower. The superheated steam inlet of the fractionating tower 2 is located at the lower right side of the tower body, and the superheated steam delivery pipeline is equipped with a remote temperature sensor and a remote pressure sensor for interlocking with the steam heating boiler 11 using a burner.

[0028] In some embodiments, the online refining equipment for pyrolysis mixed oil further includes a diesel vapor condenser 5 connected to the distillation tower 2 via the diesel outlet of the distillation tower 2 arranged in the middle of the distillation tower 2, and a diesel buffer tank 6 connected to the diesel vapor condenser 5. Furthermore, the online refining equipment for pyrolysis mixed oil further includes a gas separation bag 7 connected to the diesel buffer tank 6, and a water seal tank 8 connected to the gas separation bag 7, and part of the non-condensable gas output from the gas outlet of the water seal tank 8 is input into the heating furnace body 4 as fuel. The diesel vapor condenser 5 includes a diesel vapor primary condenser connected to the distillation tower 2, and a diesel vapor secondary condenser connected to the diesel vapor primary condenser, and the diesel vapor secondary condenser is connected to the diesel buffer tank 6. The oil and gas transported from the diesel vapor outlet connecting pipeline of the distillation tower 2 enter the diesel vapor primary condenser, and are connected to the diesel vapor secondary condenser inlet through the primary and secondary condenser connecting pipelines. The oil outlets of the first and second condensers are connected to the oil drop pipeline. An oil plug is provided at the bottom of the first condenser of diesel steam, and a drain valve is provided under the oil plug. The falling cooling oil enters the diesel buffer tank 6 for buffering. An oil outlet is provided at the bottom of the right head of the tank body, which is connected to the external oil pump to send the collected cooling oil to the external storage. An oil inlet is vertically provided on the upper part of the right tank body of the diesel buffer tank 6, an on-site pressure gauge is provided in the middle of the tank body, and an air separator 7 is vertically provided on the left side of the tank body. The outlet of the air separator 7 is provided at the top and connected to the non-condensable gas connection pipeline to send the non-condensable dry gas into the air inlet of the water seal tank 8. The pipeline inside the air inlet tank body extends into the water to prevent backflow of air. The non-condensable gas outlet of the water seal tank 8 is provided on the left side of the upper head of the tank body and is connected to the main air transmission pipeline of the non-condensable dry gas to provide fuel for the heating system.

[0029] In some embodiments, the online refining equipment for pyrolysis mixed oil further includes a steam heating boiler 11 for providing heat to the distillation tower 2, the steam heating boiler 11 includes a steam heating boiler 11 burner, and the steam heating boiler 11 burner uses part of the non-condensable gas output from the gas outlet of the water seal tank 8 as fuel. Furthermore, the online refining equipment for pyrolysis mixed oil further includes a molten salt heating furnace 12 for providing heat to the flash tower 3, the molten salt heating furnace 12 includes a molten salt heating furnace 12 burner, and the molten salt heating furnace 12 burner uses part of the non-condensable gas output from the gas outlet of the water seal tank 8 as fuel. Furthermore, the steam heating boiler 11 burner inputs superheated steam into the molten salt tank 13 of the molten salt heating furnace 12 through a hot steam delivery pipeline to heat the molten salt in the molten salt tank 13, and then is connected to the distillation tower 2 through a pipeline.

[0030] The molten salt inlet pipeline of flash tower 3 is equipped with a remote temperature sensor and a remote pressure sensor to control the temperature and pressure of the burner of the molten salt heating furnace 12. The molten salt inlet of flash tower 3 is located on the left side of the tower body. The molten salt enters the heating tube array to heat the material. The heated molten salt flows through the tube side, and the heated material flows through the shell side. The molten salt return port is located on the right side of the tower body. The molten salt return port pipeline is equipped with a remote temperature sensor and a remote pressure sensor to detect the heat absorption temperature of the returning molten salt. The molten salt return port of flash tower 3 is also equipped with a control valve to control the temperature of the molten salt entering the heating furnace. The main function of the molten salt heating furnace 12 is to heat the molten salt to the required temperature of the system. The required molten salt is extracted from the molten salt tank 13 by a high-temperature circulation pump. The molten salt coil inlet is located at the lower right side of the furnace body, and the molten salt coil outlet is located at the upper right side of the furnace body. The heating furnace burner uses pyrolysis non-condensable gas as heating fuel. The burner is located in the middle of the upper head. The flue gas outlet of the molten salt heating furnace 12 is located at the lower left side of the cylinder. The return port of the molten salt tank 13 is located at the top, and the feed port of the molten salt tank 13 is located at the upper right side. The oil vapor entering the fractionating tower 2 requires superheated steam primarily to prevent the oil vapor from liquefying during the stripping process, which would reduce the stripping effect and affect product quality. The steam heating boiler 11 is heated by a burner, and the outlet of the steam heating boiler 11 is connected to a superheated steam delivery pipeline, which extends into the molten salt tank 13 to heat the molten salt therein.

[0031] In some embodiments, the online refining equipment for pyrolysis mixed oil further includes a tubular cooler 14 connected to the heavy component outlet of the flash tower 3, which is located at the bottom of the flash tower 3, and a heavy oil tank 15 connected to the tubular cooler 14. The oil inlet of the tubular cooler 14 is connected to the heavy component outlet of the flash tower 3 via a pipeline, and the oil outlet of the tubular cooler 14 is connected to the oil inlet of the heavy oil tank 15. The oil flows through the tube side and the water flows through the shell side. After entering the heavy oil tank 15 for buffering, it is transported to an external storage area via an external oil pump.

[0032] The working process of the above-mentioned pyrolysis mixed oil online refining equipment is as follows:

[0033] After the pyrolysis is completed, the oil vapor separated is at about 250°C and enters the distillation kettle 1 directly online without condensation. After the temperature is slightly increased to about 300°C, the light components in the oil product are separated and sent to the distillation tower 2 for further processing, while the heavy components enter the flash tower 3 for further processing.

[0034] The advantages of using the above-mentioned pyrolysis mixed oil online refining equipment for simultaneous online refining and purification of pyrolysis mixed oil are mainly reflected in its high efficiency, safety, economy and environmental protection. Specifically:

[0035] The main advantage of distillation refining of pyrolysis mixed oil is that the oil vapor separated after pyrolysis is about 250°C and enters the distillation kettle 1 directly without condensation. After a slight increase in temperature to about 300°C, the light components in the oil can be separated, which greatly reduces the energy consumption of reheating after condensation.

[0036] Distillation and refining of pyrolysis mixed oil effectively removes odorous substances and impurities through physical separation. The specific process involves loading the pyrolysis oil into a distillation tower. By controlling temperature and pressure, impurities, due to their higher boiling points, are retained at the bottom of the tower, thereby separating them from the pyrolysis oil. This method not only removes odorous substances and impurities, but also improves the quality and purity of the oil.

[0037] Distillation of pyrolysis oil mixtures not only excels in removing impurities but also significantly improves product quality. By meticulously controlling temperature and pressure, harmful substances in the pyrolysis oil are effectively removed, resulting in a higher-quality product. Furthermore, process parameters can be adjusted during the distillation process to further optimize product properties and tailor them to specific application requirements.

[0038] Pyrolysis mixed oil distillation and refining also excels in environmental performance. This technology uses high-temperature thermal cracking to treat hazardous substances, reducing potential environmental damage. The process produces no secondary pollution, demonstrating excellent environmental performance. Furthermore, this technology is applicable to the treatment of a variety of oily sludges, minimizing negative environmental impacts.

[0039] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. An online refining device for thermal cracking mixed oil, characterized in that: include a distillation kettle, wherein the air inlet of the distillation kettle is connected to the rear sealing chamber of the reactor; A fractionating tower connected to the still via a fractionating tower light component inlet provided at the top of the fractionating tower and a still light component outlet provided at the top of the still; a flash tower connected to the still via a still heavy oil outlet disposed at the lower portion of the still, and connected to the fractionation tower via a flash tower diesel component outlet disposed at the upper portion of the flash tower and a fractionation tower heavy component inlet disposed at the lower portion of the fractionation tower; A heating furnace body is wrapped around the outside of the distillation kettle, and uses the non-condensable gas output and generated by the distillation tower as fuel, which is burned by a distillation kettle burner to provide heat for the distillation kettle.

2. The online refining equipment for pyrolysis mixed oil according to claim 1, characterized in that: The online refining equipment for the thermal cracking mixed oil further comprises a diesel steam condenser connected to the fractionation tower via a diesel outlet of the fractionation tower arranged in the middle of the fractionation tower, and a diesel buffer tank connected to the diesel steam condenser.

3. The online refining equipment for pyrolysis mixed oil according to claim 2, characterized in that: The online refining equipment for pyrolysis mixed oil also includes a gas separation bag connected to the diesel buffer tank, and a water seal tank connected to the gas separation bag. Part of the non-condensable gas output from the gas outlet of the water seal tank is input into the heating furnace body as fuel.

4. The online refining equipment for pyrolysis mixed oil according to claim 2, characterized in that: The diesel steam condenser includes a diesel steam primary condenser connected to the distillation tower, and a diesel steam secondary condenser connected to the diesel steam primary condenser, and the diesel steam secondary condenser is connected to the diesel cache tank.

5. The online refining equipment for pyrolysis mixed oil according to claim 1, characterized in that: The thermal cracking mixed oil online refining equipment also includes a light component cooler connected to the fractionation tower through a fractionation tower gasoline outlet arranged at the upper part of the fractionation tower, and a gasoline collection tank connected to the light component cooler.

6. The online refining equipment for pyrolysis mixed oil according to claim 3, characterized in that: The online refining equipment for pyrolysis mixed oil also includes a steam heating boiler for providing heat to the distillation tower. The steam heating boiler includes a steam heating boiler burner. The steam heating boiler burner uses part of the non-condensable gas output from the outlet of the water seal tank as fuel.

7. The online refining equipment for pyrolysis mixed oil according to claim 6, characterized in that: The online refining equipment for pyrolysis mixed oil also includes a molten salt heating furnace for providing heat to the flash tower. The molten salt heating furnace includes a molten salt heating furnace burner. The molten salt heating furnace burner uses part of the non-condensable gas output from the gas outlet of the water seal tank as fuel.

8. The online refining equipment for pyrolysis mixed oil according to claim 7, characterized in that: The steam heating boiler burner inputs superheated steam into the molten salt tank of the molten salt heating furnace through a hot steam delivery pipeline to heat the molten salt in the molten salt tank, and then is connected to the distillation tower through a pipeline.

9. The online refining equipment for thermal cracking mixed oil according to claim 1, characterized in that: The online refining equipment for the thermal cracking mixed oil further comprises a tubular cooler connected to the flash tower heavy component outlet arranged at the bottom of the flash tower.

10. The online refining equipment for pyrolysis mixed oil according to claim 9, characterized in that: The online refining equipment for the thermal cracking mixed oil further comprises a heavy oil tank connected to the tubular cooler.

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