Process and device for improving flash point of waste tire pyrolytic oil

Abstract

The invention discloses a process and a device for improving the flash point of waste tire pyrolytic oil, and relates to the technical field of the flash point of the waste tire pyrolytic oil. The system comprises a raw material pump, a raw material heavy oil heat exchanger, a heavy oil pump, a raw material flue gas heat exchanger, a rotary heating evaporator, a horizontal storage tank, a vertical tower, a tower top water cooler, a receiving tank, a light oil delivery pump, a water cooler and a tower top return pipeline. According to the process flow and the device, the flash point of the heavy oil can be controlled between 45 and 70, the additional value of the tire pyrolytic oil can be improved, the economic benefit is remarkable, the original heating furnace is modified, the spray head is additionally arranged in the rotary heating evaporator, and after the tire pyrolytic oil passes through the spray head, the flash point of the heavy oil can be controlled between 45 and 70. Light components sprayed to the furnace wall of the rotary heating evaporator in an atomized mode are instantly gasified, heavy components enter the lower portion of the rotary heating evaporator heating furnace, and along with continuous feeding, the liquid level reaches the section of a discharging opening of the rotary heating evaporator heating furnace, and the heavy components are automatically discharged into the tank.

Description

Technical Field

[0001] The invention relates to the technical field of flash point of waste tire pyrolysis oil, in particular to a process and a device for improving the flash point of waste tire pyrolysis oil. Background Art

[0002] With the continuous development of my country's economy, the automobile industry has also developed rapidly, and the road passenger and freight transportation industry and the number of household cars have risen sharply. The extensive use of automobiles has brought convenience and speed, but it has also brought serious environmental problems. Data show that in 2017, the amount of waste tires produced in my country exceeded 13 million tons, and increased at a rate of 6-8% per year, but the current situation of waste tire treatment is really worrying. This means that China's automobile industry is suffering from the erosion of "black pollution" from waste tires. After all, the service life of automobile tires is limited. Discarded waste tires cannot be degraded, and they have been affecting the ecological environment for a hundred years, causing serious pollution. This "black pollution" will cause great harm to the environment if it is not dealt with early. If a fire is caused, waste tires are flammable items. When a fire breaks out, the fire spreads very quickly, and the firefighting time is long, consuming a lot of manpower and material resources. At the same time, the billowing black smoke generated by combustion will cause serious air pollution; Realizing the harmless and resource-based treatment of waste tires is not only a need for the environment and resources, but also a goal of social management, but this process requires high-tech support.

[0003] Thermal cracking of waste tires is a booming industrial project. Liquid fuels, chemicals, and steel wire can be recycled. The quality of liquid fuel meets fuel standards and can be used as fuel or as a raw material for catalytic cracking to produce high-quality gasoline: the chemicals are mainly 8-10% limonene and carbon black; limonene is a high-value-added spice. Carbon black can be used as a mixture of rubber asphalt, or as a filler and additive for solid fuels, asphalt, and sealing products.

[0004] At present, almost all domestic enterprises producing waste tire pyrolysis oil from waste tires use high-energy intermittent rotary kiln pyrolysis, and some use continuous rotary kiln pyrolysis. The main process of intermittent production is to tear the waste tires into rubber blocks and transport them to the pyrolysis furnace for heating and pyrolysis. After the pyrolysis oil gas is cooled, it becomes tire pyrolysis oil, also known as tire oil, which is usually used as fuel oil. In the process of transportation and storage, to ensure safety, the flash point of waste tire pyrolysis oil is very important.

[0005] The composition of tire pyrolysis oil is complex, and it contains many flammable substances, such as hydrocarbons and aromatic hydrocarbons. Therefore, the flash point of tire pyrolysis oil is usually low, which can easily cause fire and explosion. The flash point of tire pyrolysis oil refers to the lowest temperature at which the oil can spontaneously ignite and produce flammable gas under certain conditions. Flash point is an important indicator for evaluating the flammability of liquids and is of great significance for the formulation of safety and fire prevention measures. In view of the above problems, the inventors proposed a process and a device for improving the flash point of waste tire pyrolysis oil to solve the above problems. Summary of the invention

[0006] In order to solve the above problems, the object of the present invention is to provide a process and device for improving the flash point of waste tire pyrolysis oil.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: a device for improving the flash point of waste tire pyrolysis oil, the device comprising a raw material pump, a raw material heavy oil heat exchanger, a heavy oil pump, a raw material flue gas heat exchanger, a rotary heating evaporator, a horizontal storage tank, a vertical tower, a tower top water cooler, a receiving tank, a light oil delivery pump, a water cooler and a tower top reflux pipeline; A feed end is provided at one end of the rotary heating evaporator, a rotary joint is installed on the feed end, a connecting pipeline is provided inside the rotary joint, the connecting pipeline leads to the feed end, a nozzle is provided at one end of the connecting pipeline, and the nozzle sprays upward toward the furnace wall of the rotary heating evaporator; The raw material pump is used for transporting waste tire pyrolysis oil in the tank area, the heavy oil pump is used for transporting product heavy oil, and the raw material heavy oil heat exchanger is used for heat exchange between waste tire pyrolysis oil and product heavy oil; The raw flue gas heat exchanger is used to recover the flue gas waste heat after the waste tire pyrolysis oil and the product heavy oil are heat exchanged, and the rotary heating evaporator further heats the waste tire pyrolysis oil and the product heavy oil after the flue gas waste heat is recovered; The horizontal storage tank is used to store the heated waste tire pyrolysis oil and product heavy oil. The vertical tower is filled with fillers. The oil vapor in the horizontal storage tank passes through the fillers in the vertical tower and enters the tower top water cooler. The tower top water cooler is used to cool the oil vapor. The receiving tank is used to receive the cooled light oil, the light oil delivery pump is used to deliver the light oil in the receiving tank, the water cooler is used to cool the heavy oil, and the tower top reflux pipeline is used for loop delivery of the heavy oil.

[0008] A tower top temperature sensor is arranged between the vertical tower and the tower top reflux pipeline, and an electric regulating valve is arranged on the tower top reflux pipeline.

[0009] The rotary heating evaporator has a diameter of 2800 mm and a length of 7800 mm.

[0010] A high-temperature liquid level gauge is provided inside the horizontal storage tank, and the high-temperature liquid level gauge controls the start and stop of the heavy oil pump in the horizontal storage tank; A high-temperature liquid level gauge is provided inside the receiving tank, and the light oil in the receiving tank is controlled by the high-temperature liquid level gauge to start and stop the light oil delivery pump.

[0011] The present invention also provides a process for improving the flash point of waste tire pyrolysis oil, comprising the following steps: S1. The waste tire pyrolysis oil from the tank area is transported to the shell side inlet of the raw material heavy oil heat exchanger through the raw material pump, and the product heavy oil is transported to the tube side inlet of the raw material heavy oil heat exchanger through the heavy oil pump, and the waste tire pyrolysis oil and the product heavy oil are heat exchanged by the raw material heavy oil heat exchanger; S2. After heat exchange in the raw material heavy oil heat exchanger, the temperature of the waste tire pyrolysis oil increases and enters the raw material flue gas heat exchanger, and then enters the rotary heating evaporator to be further heated; S3, after the import and export of the waste tire pyrolysis oil in the rotary heating evaporator heating furnace reaches equilibrium, as the waste tire pyrolysis oil continues to enter, the waste tire pyrolysis oil that has been heated and raised in temperature flows out from the back of the rotary heating evaporator heating furnace into the horizontal storage tank; S4. The oil vapor in the horizontal storage tank passes through the packing of the vertical tower, enters the top of the vertical tower, and then enters the water cooler at the top of the tower. The cooled light oil enters the receiving tank, and the light oil delivery pump sends the light oil in the receiving tank to the external delivery tank area; S5. The heavy oil after heat exchange with the raw material tire pyrolysis oil enters the water cooler for cooling and then enters the main pipeline to be sent to the external tank area. The cooled heavy oil is divided into two paths, one enters the external tank area, and the other enters the tower top reflux pipeline to control the cutting point temperature. At the same time, the reflux is controlled by the temperature measured by the tower top temperature sensor to control the opening size of the electric regulating valve, thereby allocating the flow rate entering the tower top reflux pipeline, and controlling the cutting point temperature by controlling the reflux amount.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, continuous production is achieved through the process flow and device, with large processing capacity, low heat consumption, low power consumption, and low ton processing cost; 2. In the present invention, the flash point of heavy oil can be controlled between 45-70 by using the process and device; 3. In the present invention, the added value of tire pyrolysis oil can be increased through the process and device, and the economic benefits are significant; 4. In the present invention, the original heating furnace is modified and a nozzle is added in the rotary heating evaporator. After passing through the nozzle, the tire pyrolysis oil is sprayed toward the furnace wall of the rotary heating evaporator in an atomized state. The light components are instantly vaporized, and the heavy components enter the lower part of the rotary heating evaporator heating furnace. With continuous feeding, the liquid level reaches the discharge port section of the rotary heating evaporator heating furnace and is automatically unloaded into the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the composition structure of the device of the present invention.

[0015] In the figure: 1. Raw material pump; 2. Raw material heavy oil heat exchanger; 3. Heavy oil pump; 4. Raw material flue gas heat exchanger; 5. Rotary heating evaporator; 6. Horizontal storage tank; 7. Vertical tower; 8. Tower top water cooler; 9. Receiving tank; 10. Light oil delivery pump; 11. Water cooler; 12. Tower top reflux pipeline; 13. Tower top temperature sensor; 14. Electric regulating valve; 15. Feed end; 16. Rotary joint; 17. Connecting pipeline; 18. Nozzle. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example: Figure 1 As shown, the present invention provides a device for improving the flash point of waste tire pyrolysis oil, the device comprising a raw material pump 1, a raw material heavy oil heat exchanger 2, a heavy oil pump 3, a raw material flue gas heat exchanger 4, a rotary heating evaporator 5, a horizontal storage tank 6, a vertical tower 7, a tower top water cooler 8, a receiving tank 9, a light oil delivery pump 10, a water cooler 11 and a tower top reflux pipeline 12; A feed end 15 is provided at one end of the rotary heating evaporator 5, a rotary joint 16 is installed on the feed end 15, a connecting pipeline 17 is provided inside the rotary joint 16, the connecting pipeline 17 passes into the feed end 15, a nozzle 18 is provided at one end of the connecting pipeline 17, the nozzle 18 sprays upward toward the furnace wall of the rotary heating evaporator 5, by setting the nozzle 18, the tire pyrolysis oil passes through the nozzle 18, and is sprayed toward the furnace wall of the rotary heating evaporator 5 in an atomized state, the light component is instantly gasified, and the heavy component enters the lower part of the rotary heating evaporator 5 heating furnace, with continuous feeding, the liquid level reaches the section of the discharge port of the rotary heating evaporator 5 heating furnace, and is automatically unloaded into the tank, compared with the existing technology, the original heating furnace discharge end uses the original filler to seal, the outlet pipe is lengthened, and the pipe is inserted into the interior of the vertical tower 7; The raw material pump 1 is used for conveying the waste tire pyrolysis oil in the tank area, the heavy oil pump 3 is used for conveying the product heavy oil, and the raw material heavy oil heat exchanger 2 is used for heat exchange between the waste tire pyrolysis oil and the product heavy oil; The raw flue gas heat exchanger 4 is used to recover the flue gas waste heat after the waste tire pyrolysis oil and the product heavy oil are heat exchanged, and the rotary heating evaporator 5 further heats the waste tire pyrolysis oil and the product heavy oil after the flue gas waste heat is recovered; The horizontal storage tank 6 is used to store the heated waste tire pyrolysis oil and product heavy oil. The vertical tower 7 is filled with fillers. The oil vapor in the horizontal storage tank 6 passes through the fillers in the vertical tower 7 and enters the tower top water cooler 8. The tower top water cooler 8 is used to cool the oil vapor. The receiving tank 9 is used to receive the cooled light oil, the light oil delivery pump 10 is used to deliver the light oil in the receiving tank 9, the water cooler 11 is used to cool the heavy oil, and the tower top reflux pipeline 12 is used for the loop delivery of the heavy oil.

[0018] A tower top temperature sensor 13 is provided between the tower 7 and the tower top reflux pipeline 12 , and an electric regulating valve 14 is provided on the tower top reflux pipeline 12 .

[0019] The rotary heating evaporator 5 has a diameter of 2800 mm and a length of 7800 mm.

[0020] A high-temperature liquid level gauge is provided inside the horizontal storage tank 6, and the high-temperature liquid level gauge controls the start and stop of the heavy oil pump 3 in the horizontal storage tank 6; A high-temperature liquid level gauge is provided inside the receiving tank 9 , and the light oil in the receiving tank 9 is controlled by the high-temperature liquid level gauge to start and stop the light oil delivery pump 10 .

[0021] The present invention also provides a process for improving the flash point of waste tire pyrolysis oil, comprising the following steps: S1, the waste tire pyrolysis oil from the tank area is transported to the shell side inlet of the raw material heavy oil heat exchanger 2 through the raw material pump 1, and the product heavy oil is transported to the tube side inlet of the raw material heavy oil heat exchanger 2 through the heavy oil pump 3, and the waste tire pyrolysis oil and the product heavy oil are heat exchanged by the raw material heavy oil heat exchanger 2; S2, after heat exchange in the raw material heavy oil heat exchanger 2, the temperature of the waste tire pyrolysis oil increases and enters the raw material flue gas heat exchanger 4, and then enters the rotary heating evaporator 5 to be further heated; S3, after the inlet and outlet of the waste tire pyrolysis oil in the heating furnace of the rotary heating evaporator 5 reach a balance, as the waste tire pyrolysis oil continues to enter, the waste tire pyrolysis oil that has been heated and raised in temperature flows out from the back of the heating furnace of the rotary heating evaporator 5 into the horizontal storage tank 6; S4, the oil vapor in the horizontal storage tank 6 passes through the packing of the vertical tower 7, enters the top of the vertical tower 7 and then enters the top water cooler 8, the cooled light oil enters the receiving tank 9, and the light oil delivery pump 10 delivers the light oil in the receiving tank 9 to the external delivery tank area; S5. The heavy oil after heat exchange with the raw material tire pyrolysis oil enters the water cooler 11 for cooling and then enters the main pipeline to be sent to the external tank area. The cooled heavy oil is divided into two paths, one path enters the external tank area, and the other path enters the tower top reflux pipeline 12 to control the cutting point temperature. At the same time, the reflux is controlled by the temperature measured by the tower top temperature sensor 13 to control the opening size of the electric regulating valve 14, thereby allocating the flow size entering the tower top reflux pipeline 12, and controlling the cutting point temperature by controlling the reflux amount.

[0022] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for increasing the flash point of waste tire pyrolysis oil, characterized in that: The device comprises a raw material pump (1), a raw material heavy oil heat exchanger (2), a heavy oil pump (3), a raw material flue gas heat exchanger (4), a rotary heating evaporator (5), a horizontal storage tank (6), a vertical tower (7), a tower top water cooler (8), a receiving tank (9), a light oil delivery pump (10), a water cooler (11) and a tower top reflux pipeline (12); A feed end (15) is provided at one end of the rotary heating evaporator (5), a rotary joint (16) is installed on the feed end (15), a connecting pipeline (17) is provided inside the rotary joint (16), the connecting pipeline (17) is connected to the feed end (15), a nozzle (18) is provided at one end of the connecting pipeline (17), and the nozzle (18) sprays upward toward the furnace wall of the rotary heating evaporator (5); The raw material pump (1) is used for conveying waste tire pyrolysis oil in the tank area, the heavy oil pump (3) is used for conveying product heavy oil, and the raw material heavy oil heat exchanger (2) is used for heat exchange between waste tire pyrolysis oil and product heavy oil; The raw flue gas heat exchanger (4) is used to recover the waste heat of the flue gas after the waste tire pyrolysis oil and the product heavy oil are heat-exchanged, and the rotary heating evaporator (5) further heats the waste tire pyrolysis oil and the product heavy oil after the waste heat of the flue gas is recovered; The horizontal storage tank (6) is used to store the heated waste tire pyrolysis oil and product heavy oil. The vertical tower (7) is filled with fillers. The oil vapor in the horizontal storage tank (6) passes through the fillers in the vertical tower (7) and enters the tower top water cooler (8). The tower top water cooler (8) is used to cool the oil vapor. The receiving tank (9) is used to receive the cooled light oil, the light oil delivery pump (10) is used to deliver the light oil in the receiving tank (9), the water cooler (11) is used to cool the heavy oil, and the tower top reflux pipeline (12) is used for loop delivery of the heavy oil.

2. The device for increasing the flash point of waste tire pyrolysis oil according to claim 1, characterized in that: A tower top temperature sensor (13) is provided between the vertical tower (7) and the tower top reflux pipeline (12), and an electric regulating valve (14) is provided on the tower top reflux pipeline (12).

3. The device for increasing the flash point of waste tire pyrolysis oil according to claim 1, characterized in that: The rotary heating evaporator (5) has a diameter of 2800 mm and a length of 7800 mm.

4. The device for increasing the flash point of waste tire pyrolysis oil according to claim 1, characterized in that: A high-temperature liquid level gauge is provided inside the horizontal storage tank (6), and the high-temperature liquid level gauge controls the start and stop of the heavy oil pump (3) in the horizontal storage tank (6); A high-temperature liquid level gauge is provided inside the receiving tank (9), and the light oil in the receiving tank (9) is controlled by the high-temperature liquid level gauge to start and stop the light oil delivery pump (10).

5. A process for increasing the flash point of waste tire pyrolysis oil as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1, the waste tire pyrolysis oil from the tank area is transported to the shell side inlet of the raw material heavy oil heat exchanger (2) through the raw material pump (1), the product heavy oil is transported to the tube side inlet of the raw material heavy oil heat exchanger (2) through the heavy oil pump (3), and the waste tire pyrolysis oil and the product heavy oil are heat exchanged by the raw material heavy oil heat exchanger (2); S2, after heat exchange in the raw material heavy oil heat exchanger (2), the temperature of the waste tire pyrolysis oil increases and enters the raw material flue gas heat exchanger (4), and then enters the rotary heating evaporator (5) to be further heated; S3, after the inlet and outlet of the waste tire pyrolysis oil in the heating furnace of the rotary heating evaporator (5) reach equilibrium, as the waste tire pyrolysis oil continues to enter, the waste tire pyrolysis oil, which has been heated to a higher temperature, flows out from the rear of the heating furnace of the rotary heating evaporator (5) into the horizontal storage tank (6); S4, the oil vapor in the horizontal storage tank (6) passes through the packing of the vertical tower (7), enters the top of the vertical tower (7), and then enters the top water cooler (8), and the light oil after cooling enters the receiving tank (9), and the light oil delivery pump (10) delivers the light oil in the receiving tank (9) to the external delivery tank area; S5. The heavy oil after heat exchange with the raw material tire pyrolysis oil enters the water cooler (11) for cooling and then enters the main pipeline to be sent to the external tank area. The cooled heavy oil is divided into two paths, one path enters the external tank area, and the other path enters the tower top reflux pipeline (12) to control the cutting point temperature. At the same time, the reflux is to control the opening size of the electric regulating valve (14) by the temperature measured by the tower top temperature sensor (13), thereby allocating the flow size entering the tower top reflux pipeline (12), and controlling the cutting point temperature by controlling the reflux amount.

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