Device for producing modified pitch through two-section series-connection steam continuous pressurization thermal polymerization

Abstract

The utility model discloses a device for producing modified pitch by two-section serial steam continuous pressurization thermal polymerization. The device is sequentially provided with an oil storage tank, a dehydrating tower, a tar distillation tower, an anthracene oil distillation tower, a pitch reactor and a flash tower along the preparation direction. The asphalt reactor is a pressurized reaction kettle and comprises a first reaction kettle and a second reaction kettle, and the bottoms of the first reaction kettle and the second reaction kettle are communicated in series through a pipeline; the top of each of the first reaction kettle and the second reaction kettle is provided with a leading-in pipe, a leading-out pipe, a pressure gauge and a thermometer, the leading-in pipes are used for leading in superheated steam, the leading-out pipes are used for leading out volatile components, the thermometers are used for displaying the internal reaction temperature in real time, and the pressure gauges are used for displaying the internal pressure value in real time; the outer sides of the first reaction kettle and the second reaction kettle are provided with thermal insulation interlayers, and the thermal insulation interlayers are used for thermal insulation treatment of internal materials. Low-boiling-point substances are evaporated out through steam stripping, the softening point of the asphalt is increased, the temperature in the asphalt reactor is reduced by introducing steam, and the generation of quinoline insoluble substances is reduced.

Description

Technical Field

[0001] The utility model relates to an asphalt production technology, in particular to a device for producing modified asphalt by continuous pressurized thermal polymerization of two-stage steam in series. Background Art

[0002] CN101289624B discloses a method for producing high-quality medium-temperature modified asphalt by two-stage series continuous pressurized thermal polymerization, which comprises the following steps: the medium-temperature asphalt is subjected to low-pressure heating polycondensation by two-stage series reactors to obtain modified asphalt, wherein a heating pre-cracking reaction is performed in the first stage, and a heating polycondensation reaction is performed rapidly in the second stage, thereby increasing the content of toluene insolubles, reducing the content of quinoline insolubles, and improving the β value; the reacted materials enter a flash tower, in which the softening point of the modified asphalt is adjusted; the tail gas of the flash system enters a flue gas absorption system, and is discharged through a chimney after being absorbed by circulating wash oil. The method can produce medium-temperature modified asphalt that meets special needs, that is, medium-temperature modified asphalt with a low softening point (80°C to 90°C), a softening point amplitude that can be controlled within the range of ±1°C, and a high β resin content (>18%), providing high-quality raw materials for the production of ultra-high power graphite electrodes.

[0003] This technology uses two reactors in series to perform two-step reactions, and finally adjusts the softening point in a flash tower. Due to the high reaction temperature in the reactor, it is easy to cause the formation of quinoline insolubles. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to reduce the generation of quinoline insolubles. Superheated steam is introduced into the asphalt reactor, and its main function is to evaporate low-boiling point substances through the stripping effect of steam, thereby increasing the softening point of asphalt. The introduction of steam can reduce the temperature in the asphalt reactor and reduce the generation of quinoline insolubles. By introducing superheated steam, qualified modified asphalt can be produced at a lower temperature, and the content of quinoline insolubles in asphalt can be reduced.

[0005] In order to solve the above technical problems, the utility model has obtained the technical solution of the utility model through practice and summary. The utility model adopts the following technical solution:

[0006] A two-stage serially connected device for producing modified asphalt by continuous steam pressurized thermal polymerization comprises an oil storage tank, a dehydration tower, a tar distillation tower, an anthracene oil distillation tower, an asphalt reactor and a flash tower in sequence along the preparation direction.

[0007] The asphalt reactor is a pressurized reactor, including a No. 1 reactor and a No. 2 reactor, which are connected in series at the bottom through a pipeline;

[0008] The tops of the No. 1 and No. 2 reactors are both provided with an inlet pipe, an outlet pipe, a pressure gauge and a thermometer, the inlet pipe is used to introduce superheated steam, the outlet pipe is used to lead out volatiles, the thermometer is used to display the internal reaction temperature in real time, and the pressure gauge is used to display the internal pressure value in real time;

[0009] The outer sides of the No. 1 reactor and the No. 2 reactor are provided with a heat-insulating interlayer, which is used for heat-insulating the internal materials.

[0010] Preferably, the No. 1 reactor has side inlet and bottom outlet, the No. 2 reactor has bottom inlet and side outlet, and a plurality of regulating valves are installed along the height direction of the outlet of the No. 2 reactor.

[0011] Preferably, a wall scraper is installed in both the No. 1 and No. 2 reactors, and a servo motor and a wall scraper lifting mechanism are installed on the top of the No. 1 and No. 2 reactors, the servo motor is used to drive the wall scraper, and the wall scraper lifting mechanism is used to drive the wall scraper to move up and down.

[0012] Optimal solution: the wall scraper lifting mechanism includes a mounting platform and a telescope, the bottom of the telescope is a fixed end, and the top is an output end for driving the mounting platform to move up and down, the servo motor is installed on the mounting platform, the output end of the servo motor is installed with a driving gear, a mounting hole is provided on the mounting platform, the wall scraper is rotatably installed in the mounting hole, a gear plate is installed on the top of the wall scraper, the gear plate and the driving gear are meshed with each other, and a mechanical sealing structure is provided between the wall scraper and the top of the reactor.

[0013] Preferred solution: the scraper includes a scraper shaft and a scraper plate, the scraper plate is fixed on the scraper shaft, the scraper plate includes a connecting part, a kettle bottom scraping part and a kettle wall scraping part, the connecting part is horizontally fixed to the bottom of the scraper shaft, the free end of the connecting part is fixedly connected to the bottom of the kettle bottom scraping part, and the top of the kettle bottom scraping part is fixedly connected to the bottom of the kettle wall scraping part.

[0014] Preferably, the telescopic device is a pneumatic cylinder or a hydraulic cylinder.

[0015] Preferably, a bearing is installed in the mounting hole, a turntable is provided on the wall scraper, the turntable is located on the top of the mounting platform, and an annular groove is provided on the opposite side of the turntable and the mounting platform, and a ball is provided in the annular groove.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] Superheated steam is introduced into the No. 1 and No. 2 reactors. Its main function is to evaporate the low-boiling point substances through the steam stripping effect, increase the softening point of asphalt, and introduce steam to reduce the temperature in the asphalt reactor and reduce the formation of quinoline insolubles. By introducing superheated steam, qualified modified asphalt can be produced at a lower temperature and the content of quinoline insolubles in asphalt can be reduced.

[0018] The bottom of the No. 1 and No. 2 reactors are connected in series, and two stripping operations are performed in the two reactors. The pressure of the two stripping operations can be the same or different. When the pressure is the same, 0.4-0.5MPa is used, which is suitable for medium-scale continuous production; when the pressure is different, the pressure inside the No. 1 reactor is 0.35-0.45MPa, and the pressure inside the No. 2 reactor is 0.45-0.55MPa, which is suitable for large-scale continuous production. The internal pressure can be maintained by adding flow valves on the inlet and outlet pipes to adjust the inlet and outlet volumes.

[0019] A regulating valve is added in the height direction at the discharge port of the No. 2 reactor, and the liquid level height and residence time of the No. 2 reactor are regulated by the regulating valve.

[0020] A wall scraper is added in the reactor, and a wall scraper lifting mechanism is used to adjust the elevation of the wall scraper in the reactor. The wall scraping range is increased by changing the elevation, and the space occupied by the scraper plate inside the reactor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a structural diagram of an asphalt reactor of the utility model;

[0023] Figure 3 The internal structure diagram of the reactor;

[0024] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 The structure diagram of the turntable;

[0026] Figure 6 The structural diagram of the installation platform;

[0027] Figure 7 This is the structural diagram of the rotation node of the turntable and the mounting platform. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Examples, such as Figure 1 The device for producing modified asphalt by continuous steam pressurized thermal polymerization with two stages in series is provided with an oil storage tank 1, a dehydration tower 2, a tar distillation tower 3, an anthracene oil distillation tower 4, an asphalt reactor 5, and a flash tower 6 in sequence along the preparation direction.

[0031] The asphalt reactor 5 is a pressurized reactor, including a No. 1 reactor 51 and a No. 2 reactor 52. The No. 1 reactor 51 and the No. 2 reactor 52 are connected in series at the bottom through a pipeline and separated by a connecting vessel. The liquid levels of the two reactors are at the same height.

[0032] like Figure 2 As shown, the tops of the No. 1 reactor 51 and the No. 2 reactor 52 are both provided with an inlet pipe 511, an outlet pipe 512, a pressure gauge 513 and a thermometer 514. The inlet pipe 511 is used to introduce superheated steam, the outlet pipe 512 is used to lead out volatiles, the thermometer 514 is used to display the internal reaction temperature in real time, the reaction temperature is 360°C, and the pressure gauge 513 is used to display the internal pressure value in real time. Two stripping operations are performed in the two reactors, and the pressures of the two stripping operations can be the same or different. When the pressures are the same, 0.4-0.5MPa is used, which is suitable for medium-sized continuous production; when the pressures are different, the pressure inside the No. 1 reactor is 0.35-0.45MPa, and the pressure inside the No. 2 reactor is 0.45-0.55MPa, which is suitable for large-scale continuous production. The internal pressure can be maintained by adding flow valves to the inlet pipe 511 and the outlet pipe 512 to adjust the inlet and outlet volumes. The outlet pipe 512 is externally connected to the oil return tank for recovering oil vapor.

[0033] The outer sides of the No. 1 reactor 51 and the No. 2 reactor 52 are provided with an insulation interlayer. The insulation interlayer structure is an existing mature technology and is directly applied here without changing the structure, so it is not described in detail. The insulation interlayer is used for heat preservation of internal materials.

[0034] The coal tar in the oil storage tank 1 is dehydrated and light oiled by the dehydration tower 2, and distilled twice in the tar distillation tower 3 and the anthracene oil distillation tower 4 to obtain a 370°C material which enters the asphalt reactor 5 for reaction treatment, and is stripped in the No. 1 reactor 51 and the No. 2 reactor 52. The two stripping treatments can strip it more fully, especially for large-flow feed that cannot be stripped in time after entering. It can be further stripped in the No. 2 reactor 52 for more sufficient treatment, thereby increasing the softening point, accelerating the flashing rate in the flash tower 6, and reducing the formation of quinoline insolubles. The superheated steam temperature is 280°C, and the material is reduced to 360°C after introduction.

[0035] Based on the above embodiments, Figure 2 As shown, the No. 1 reactor 51 is side-in and bottom-out, and the No. 2 reactor 52 is bottom-in and side-out, and a plurality of regulating valves 515 are installed along the height of the discharge port of the No. 2 reactor 52, and the liquid level and residence time of the No. 2 reactor 52 are regulated by the regulating valves 515.

[0036] Based on the above embodiment, the following improvements are made: Figure 3 , 4 As shown in , 5, since the material inside the reactor is relatively viscous and prone to coking, a scraping wall structure is added inside, specifically:

[0037] The first reactor 51 and the second reactor 52 are both equipped with a wall scraper 53. A servo motor 54 and a wall scraper lifting mechanism are installed on the top of the first reactor 51 and the second reactor 52. The servo motor 54 is used to drive the wall scraper 53, and the wall scraper lifting mechanism is used to drive the wall scraper 53 to move up and down.

[0038] The wall scraper lifting mechanism includes a mounting platform 55 and a telescope 56. The bottom of the telescope 56 is a fixed end and the top is an output end for driving the mounting platform 55 to move up and down. The servo motor 54 is installed on the mounting platform 55. The output end of the servo motor 54 is installed with a driving gear 57. A mounting hole is provided on the mounting platform 55. The wall scraper 53 is rotatably installed in the mounting hole. A gear plate 58 is installed on the top of the wall scraper 53. The gear plate 58 and the driving gear 57 are meshed with each other. A mechanical sealing structure is provided between the wall scraper 53 and the top of the reactor. The mechanical sealing structure is an existing mature technology, and you can refer to CN202418595U.

[0039] The scraper 53 includes a scraper shaft 531 and a scraper plate 532, the scraper plate 532 is fixed on the scraper shaft 531, the scraper plate 532 includes a connecting portion 5321, a kettle bottom scraper portion 5322 and a kettle wall scraper portion 5323, the connecting portion 5321 is horizontally fixed to the bottom of the scraper shaft 531, the free end of the connecting portion 5321 is fixedly connected to the bottom of the kettle bottom scraper portion 5322, and the top of the kettle bottom scraper portion 5322 is fixedly connected to the bottom of the kettle wall scraper portion 5323.

[0040] The telescopic device 56 is a pneumatic cylinder or a hydraulic cylinder.

[0041] A bearing is installed in the installation hole. A turntable 59 is provided on the wall scraper 53. The turntable 59 is located on the top of the installation platform 55. An annular groove is provided on the opposite side of the turntable 59 and the installation platform 55, and a ball 510 is provided in the annular groove.

[0042] The servo motor 54 drives the driving gear 57 to drive the gear plate 58 and the scraper shaft 531 of the scraper 53 to rotate, and the scraper plate 531 scrapes the inside of the reactor. The scraper plate 531 can clean the bottom and the wall of the reactor. At the same time, the telescopic device 53 drives the mounting platform 55 upward, and then the scraper 53 moves upward to expand the cleaning range in the reactor. At the same time, the scraper 53 can perform internal mixing when scraping the inside of the reactor.

[0043] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution of the utility model and its utility model concept should be included in the protection scope of the utility model.

Claims

1. A two-stage serial steam continuous pressurized thermal polymerization device for producing modified asphalt, which is provided with an oil storage tank, a dehydration tower, a tar distillation tower, an anthracene oil distillation tower, an asphalt reactor, and a flash tower in sequence along the preparation direction, characterized in that: The asphalt reactor is a pressurized reactor, including a No. 1 reactor and a No. 2 reactor, which are connected in series at the bottom through a pipeline; The tops of the No. 1 and No. 2 reactors are both provided with an inlet pipe, an outlet pipe, a pressure gauge and a thermometer, the inlet pipe is used to introduce superheated steam, the outlet pipe is used to lead out volatiles, the thermometer is used to display the internal reaction temperature in real time, and the pressure gauge is used to display the internal pressure value in real time; The outer sides of the No. 1 reactor and the No. 2 reactor are provided with a heat-insulating interlayer, and the heat-insulating interlayer is used for heat-insulating the internal materials.

2. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 1 is characterized in that: The No. 1 reactor has a side-inlet and a bottom-outlet, while the No. 2 reactor has a bottom-inlet and a side-outlet, and a plurality of regulating valves are installed along the height direction of the discharge port of the No. 2 reactor.

3. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 1 is characterized in that: The No. 1 and No. 2 reactors are both equipped with wall scrapers. A servo motor and a wall scraper lifting mechanism are installed on the top of the No. 1 and No. 2 reactors. The servo motor is used to drive the wall scraper, and the wall scraper lifting mechanism is used to drive the wall scraper to move up and down.

4. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 3 is characterized in that: The wall scraper lifting mechanism includes a mounting platform and a telescope, the bottom of the telescope is a fixed end, and the top is an output end for driving the mounting platform to move up and down. The servo motor is installed on the mounting platform, and a driving gear is installed on the output end of the servo motor. A mounting hole is provided on the mounting platform, and the wall scraper is rotatably installed in the mounting hole. A gear plate is installed on the top of the wall scraper, and the gear plate and the driving gear are meshed with each other. A mechanical sealing structure is provided between the wall scraper and the top of the reactor.

5. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 4 is characterized in that: The scraper includes a scraper shaft and a scraper plate, which is fixed on the scraper shaft. The scraper plate includes a connecting part, a kettle bottom scraping part and a kettle wall scraping part. The connecting part is horizontally fixed to the bottom of the scraper shaft, the free end of the connecting part is fixedly connected to the bottom of the kettle bottom scraping part, and the top of the kettle bottom scraping part is fixedly connected to the bottom of the kettle wall scraping part.

6. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 4 is characterized in that: The telescopic device is a cylinder or a hydraulic cylinder.

7. The device for producing modified asphalt by continuous steam pressurization thermal polymerization in two stages in series according to claim 4 is characterized in that: A bearing is installed in the installation hole, a rotating disk is arranged on the wall scraper, the rotating disk is located on the top of the installation platform, and an annular groove is arranged on the opposite side of the rotating disk and the installation platform, and a ball is arranged in the annular groove.

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