System for preparing modified pitch with high softening point and low quinoline insolubles

Abstract

The utility model discloses a system for preparing modified pitch with high softening point and low quinoline insoluble, which comprises an oil storage tank, a dehydrating tower, a tar distillation tower, an anthracene oil distillation tower and a flash tower which are arranged along the preparation direction, a mixing box is positioned between the dehydrating tower and the tar distillation tower, a solvent introduction pipe is arranged on the mixing box, and coal tar is introduced into the mixing box from the oil storage tank through a delivery pump. A stirrer is arranged in the mixing box; the separator is located between the mixing box and the tar distillation tower, the top of the separator is provided with a feeding box and a solvent volatile matter outlet pipe which is arranged on the feeding box and extends into the separator, the bottom of the separator is provided with a quinoline insoluble matter discharge port and a tar discharge port, and a separation structure and an evaporation structure are arranged in the separator; the asphalt reactor is arranged between the anthracene oil distillation tower and the flash tower, a partition plate is arranged in the asphalt reactor, a superheated steam inlet and a volatile component outlet are formed in the top of the asphalt reactor, a side feeding hole and a side discharging hole are formed in the side part of the asphalt reactor, and a regulation and control valve is arranged at the side discharging hole along the height direction.

Description

Technical Field

[0001] The utility model relates to an asphalt production technology, in particular to a system for preparing high-softening-point and low-quinoline-insoluble modified asphalt. Background Art

[0002] Coal tar is directly recovered by condensation from coking coal gas, and its yield accounts for about 3-4% of coking dry coal. Its composition is extremely complex, containing tens of thousands of substances, more than 500 of which have been identified, and more than 200 products that can be processed. Among them, naphthalene oil, anthracene oil, washing oil and phenols are very scarce chemical products unique to coal tar, and asphalt accounts for more than half of the coal tar content. With the increase of asphalt softening point, quinoline insolubles (QI) also increase a lot accordingly. Excessive quinoline insolubles will seriously affect the performance of coal tar. How to prepare low QI and high softening point coal tar is the development trend of the industry.

[0003] CN109852413A discloses a method for producing modified asphalt from coal tar, wherein the raw tar is dehydrated in a dehydration tower, distilled and separated in an atmospheric distillation tower, vacuum distilled in a vacuum distillation tower, reacted in a modified asphalt reaction tower, and flashed in a modified asphalt flash tower, and finally a qualified modified asphalt product is obtained. The present invention has the advantages of short process flow, good operation, low investment, low energy consumption, good environmental protection effect, and adaptability to large-scale production. However, when preparing high-softening point asphalt, it is necessary to remove light components by high temperature to increase the softening point of the asphalt, but the generation of quinoline insolubles will be accelerated at high temperature, so there is a contradiction, so a system for producing this type of modified asphalt is proposed to solve the above contradiction. Summary of the invention

[0004] The technical problem to be solved by the utility model is: how to reduce the content of quinoline insoluble matter in asphalt while ensuring its high softening point, remove quinoline insoluble matter in raw coal tar, appropriately reduce the reaction temperature by steam stripping treatment and reduce the generation of quinoline insoluble matter in the asphalt preparation process.

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

[0006] The system for preparing high softening point and low quinoline insoluble modified asphalt includes an oil storage tank, a dehydration tower, a tar distillation tower, an anthracene oil distillation tower, and a flash tower arranged along the preparation direction, and also includes:

[0007] A mixing box is located between the dehydration tower and the tar distillation tower, and is provided with a solvent introduction pipe. Coal tar is introduced into the mixing box from the oil storage tank via a delivery pump. A stirrer is provided in the mixing box, and is used to stir and mix the coal tar and the solvent;

[0008] A separator, the separator is located between the mixing box and the tar distillation tower, the top of the separator is provided with a feed box and a solvent volatiles outlet pipe provided on the feed box and extending to the inside of the separator, the bottom is provided with a quinoline insoluble material outlet and a tar outlet, a separation structure and an evaporation structure are provided in the separator, the separation structure is used to separate the quinoline insoluble material and discharge it from the quinoline insoluble material outlet, and the evaporation structure is used to separate the solvent and lead it out through the solvent volatiles outlet pipe;

[0009] Asphalt reactor: The asphalt reactor is arranged between the anthracene oil distillation tower and the flash tower, and is provided with a partition plate inside. The partition plate is used for first-in-first-out and last-in-last-out of materials. The top of the asphalt reactor is provided with a superheated steam inlet and a volatile matter outlet, and the side is provided with a side feed port and a side discharge port. A regulating valve is provided at the side discharge port along the height direction.

[0010] Preferably, a constant temperature water bath structure is provided in the mixing box, and the constant temperature water bath structure is used for treating the internal materials at a constant temperature.

[0011] Preferably, the separation structure comprises:

[0012] An inner separation part, the bottom of which is provided with a blocking plate;

[0013] The outer separation part has a baffle plate at the top, which is fixed on the inner wall of the separator, a gap is reserved between the lower surface of the baffle plate and the top of the inner separation part, and a baffle ring extending downward is installed on the inner ring;

[0014] The guide part includes a plurality of guide members 1 and a plurality of guide members 2. The guide members 1 are arranged between the inner separation part and the outer separation part. The guide members 1 are arranged in a spiral distribution from top to bottom and the top starting position is located on the lower surface of the baffle. The guide members 2 are located on the outer separation part below the inner separation part. The guide members 2 are arranged in a spiral distribution from top to bottom and the top starting position is located on the trend line of the guide members 1.

[0015] In a preferred embodiment, the guide member 1 and the guide member 2 both include a mounting plate 1 and a guide plate, the mounting plate 1 is provided with a connecting hole 1, the connecting hole 1 is used to connect the external separation structure, the guide plate is used to guide the quinoline insoluble matter downward, and the angle between the side of the guide plate away from the mounting plate 1 and the direction facing the quinoline insoluble matter in the horizontal cross section is an acute angle;

[0016] The guide plate 1 also includes a mounting plate 2, on which a connecting hole 2 is provided, and the connecting hole 2 is used for connecting the inner separation structure.

[0017] Preferably, the partition plate is arranged obliquely to separate the internal area of ​​the asphalt reactor into a pretreatment zone and a reaction zone. The pretreatment zone is larger at the top and smaller at the bottom, while the reaction zone is smaller at the top and larger at the bottom.

[0018] Preferably, the evaporation structure comprises a heating tube embedded in the inner wall of the separator and a heat conducting plate covering the outer side of the heating tube and coplanar with the inner wall of the separator.

[0019] Preferably, the separator is rotatably arranged relative to the feed box, and a transmission structure is provided at the bottom of the separator, a driving mechanism is connected via the transmission structure, and the driving mechanism is a combination of a motor and a reducer, which drives the separator to rotate via the transmission structure.

[0020] Preferably, a connecting flange and a discharge box are installed at the bottom of the separator, the discharge box and the connecting flange are rotatably installed, and the discharge box is used to collect the material after the solvent is separated. A discharge pipe and a collecting pipe are arranged on the discharge box. The top of the collecting pipe is a trumpet-shaped structure for collecting quinoline insolubles, and a discharge port is arranged at the bottom.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model removes the original quinoline insolubles in the coal tar before modification, and adopts solvent dissolution to remove the solid-phase quinoline insolubles by centrifugation. The centrifugal removal adopts the method of increasing the separation path through the internal and external separation structures in a limited space, thereby improving the separation effect and separation purity, and ensuring that the residual amount of quinoline insolubles in the coal tar is maintained below 0.06%. Superheated steam is also introduced into the asphalt reactor, and the internal materials are stripped by the superheated steam, which can strip the internal low-boiling point substances and improve the asphalt softening point. The reaction temperature is maintained at 360°C, the superheated steam temperature is maintained at 280°C, and the feed temperature is maintained at 370°C, thereby improving the asphalt softening point and effectively reducing the generation of quinoline insolubles, thereby obtaining a modified asphalt with a high softening point and low quinoline insolubles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0024] Figure 2 This is a structural diagram of a mixing box of the utility model;

[0025] Figure 3 This is the overall structure diagram of the separator of the utility model;

[0026] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0027] Figure 5 The internal structure diagram of the separator;

[0028] Figure 6 This is the internal structure diagram of the discharge box at the bottom of the separator;

[0029] Figure 7It is a horizontal cross-sectional view of the inner separation part and the outer separation part;

[0030] Figure 8 It is a horizontal cross-section of the outer separation part;

[0031] Fig. 9 The overall structure diagram of the guide member 1;

[0032] Fig.10 The overall structure diagram of the guide member 2;

[0033] Fig.11 This is the internal structure diagram of the asphalt separator. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] Example 1

[0037] like Figure 1 As shown, the system for preparing high softening point and low quinoline insoluble modified asphalt includes an oil storage tank 1, a dehydration tower 2, a tar distillation tower 3, an anthracene oil distillation tower 4, and a flash tower 5 arranged along the preparation direction, and also includes:

[0038] like Figure 2 As shown, a mixing box 6 is located between the dehydration tower 2 and the tar distillation tower 3, and a solvent introduction pipe 61 is arranged on the mixing box 6. Coal tar is introduced into the mixing box 6 from the oil storage tank 1 through a delivery pump. A stirrer 62 is arranged in the mixing box 6, and the stirrer 62 is used to stir and mix the coal tar and the solvent;

[0039] A constant temperature water bath structure 63 may be added to the mixing box 6, and the constant temperature water bath structure 63 is used to treat the internal materials at a constant temperature to ensure rapid and uniform mixing.

[0040] like Figure 3As shown, the separator 7 is used to separate the solid phase. The separator 7 is located between the mixing box 6 and the tar distillation tower 3. A feed box 71 and a solvent volatiles outlet pipe 711 arranged on the feed box 71 and extending to the inside of the separator 7 are arranged on the top, and a quinoline insoluble matter outlet 72 and a tar outlet 73 are arranged at the bottom. A separation structure 74 and an evaporation structure 75 are arranged inside the separator 7.

[0041] The separation structure 74 is used to separate the solid phase quinoline insoluble matter and discharge it from the quinoline insoluble matter discharge port 72;

[0042] The evaporation structure 75 is used to separate the solvent and lead it out through the solvent volatiles outlet pipe 711; the liquid phase material is acted on the evaporation structure 75 by centrifugal force to separate the solvent in the liquid phase, and the solvent will be discharged from the solvent volatiles outlet pipe 711 at the top, and after discharge, it will be condensed and recovered by the condenser.

[0043] like Fig.11 As shown, the asphalt reactor 8 is arranged between the anthracene oil distillation tower 4 and the flash tower 5, and a partition plate 81 is arranged therein, and the partition plate 81 is used for first-in-first-out and last-in-last-out of materials. The top of the asphalt reactor 8 is provided with a superheated steam inlet 82 and a volatile matter outlet 83, and the side is provided with a side feed inlet 84 and a side discharge port 85, and a regulating valve 86 is arranged along the height direction at the side discharge port 85. The liquid level inside is controlled by the partition plate 81 and the regulating valve 86, and the residence time of the material inside can also be controlled. During the residence period, a reaction will occur for modification treatment. Introducing superheated steam in the reactor can reduce the reaction temperature of the material. The material introduction temperature of this scheme is 370°C, the superheated steam temperature is 280°C, and the pressure is 11 kg. After stripping, the reaction temperature of the material is controlled at 360°C, which effectively reduces the amount of quinoline insoluble matter generated and increases the softening point of asphalt.

[0044] In the above embodiment, if Figure 5 As shown, the separation structure 74 includes:

[0045] The inner separation part 741 has a blocking plate 742 at its bottom, and the blocking plate 742 is used to prevent it from falling;

[0046] The outer separation part 743 is provided with a baffle plate 744 on the top thereof. The baffle plate 744 is fixed on the inner wall of the separator 7. On the one hand, the outer separation part 743 is fixed. On the other hand, the solid-phase quinoline insoluble matter can be introduced from the top of the inner separation part 741 to the outer separation part 743. A gap is reserved between the lower surface of the baffle plate 744 and the top of the inner separation part 741 to facilitate the introduction of the quinoline insoluble matter. The inner ring is provided with a baffle ring 745 extending downward. The baffle ring 745 is located on the inner side of the top of the inner separation part 741 to facilitate the collection of the quinoline insoluble matter in combination with the baffle plate 744. The solid-phase quinoline insoluble matter is transferred outward by centrifugal force, thereby extending the separation path and ensuring the separation effect and the purity of the separated quinoline insoluble matter.

[0047] The guide part includes a plurality of guide members 1 746 and a plurality of guide members 2 747. The guide members 1 746 are arranged between the inner separation part 741 and the outer separation part 743. The guide members 1 746 are arranged in a spiral distribution from top to bottom and the top starting position is located on the lower surface of the baffle 744. The inclination angles of the guide members 1 746 and the guide members 2 747 increase gradually from top to bottom. The guide members 2 747 are located on the outer separation part 743 below the inner separation part 741. The guide members 2 747 are arranged in a spiral distribution from top to bottom and the top starting position is located on the trend line of the guide members 1 746.

[0048] In the above embodiment, if Figure 7 , 8 As shown in FIGS. 9 and 10, the guide member 1 746 and the guide member 2 747 both include a mounting plate 1 7461 and a guide plate 7462. The mounting plate 1 7461 is provided with a connecting hole 1, the connecting hole 1 is used to connect the outer separation part 743, the guide plate 7462 is used to guide the quinoline insoluble matter downward, and the angle between the side of the guide plate 7462 away from the mounting plate 1 7461 and the direction facing the quinoline insoluble matter on the horizontal cross section is an acute angle;

[0049] The guide member 1 746 also includes a mounting plate 2 7463 , on which a connecting hole 2 is provided, and the connecting hole 2 is used to connect the inner separation part 741 .

[0050] In the above embodiment, if Fig.11 As shown, the partition plate 81 is arranged obliquely to divide the internal area of ​​the asphalt reactor 8 into a pretreatment zone and a reaction zone. The pretreatment zone is larger at the top and smaller at the bottom, while the reaction zone is smaller at the top and larger at the bottom.

[0051] In the above embodiment, if Figure 7 and Figure 8 As shown, the evaporation structure 75 includes a heating tube 751 embedded in the inner wall of the separator 7 and a heat conducting plate 752 covering the outer side of the heating tube 751 and coplanar with the inner wall of the separator 7 .

[0052] In the above embodiment, if Figure 4 , 6 As shown, the separator 7 is rotatably arranged relative to the feed box 71, and a transmission structure is provided at the bottom of the separator 7, through which a driving mechanism 8 is connected. The driving mechanism 8 is a combination of a motor and a reducer, and the driving mechanism 8 drives the separator 7 to rotate through the transmission structure.

[0053] In the above embodiment, if Figure 4 and 6 As shown, a connecting flange 9 and a discharge box 10 are installed at the bottom of the separator 7, the discharge box 10 and the connecting flange 9 are rotatably installed, and the discharge box 10 is used to collect the material after the solvent is separated. A discharge pipe 11 and a collecting pipe 12 are arranged on the discharge box 10, and the top of the collecting pipe 12 is a trumpet-shaped structure for collecting quinoline insolubles, and a discharge port is arranged at the bottom.

[0054] 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 and inventive concept of the utility model should be included in the protection scope of the utility model.

Claims

1. A system for preparing high softening point and low quinoline insoluble modified asphalt, comprising an oil storage tank, a dehydration tower, a tar distillation tower, an anthracene oil distillation tower, and a flash tower arranged along the preparation direction, characterized in that: Also includes: A mixing box is located between the dehydration tower and the tar distillation tower, and is provided with a solvent introduction pipe. Coal tar is introduced into the mixing box from the oil storage tank via a delivery pump. A stirrer is provided in the mixing box, and is used to stir and mix the coal tar and the solvent; A separator, the separator is located between the mixing box and the tar distillation tower, the top of the separator is provided with a feed box and a solvent volatiles outlet pipe provided on the feed box and extending to the inside of the separator, the bottom is provided with a quinoline insoluble material outlet and a tar outlet, a separation structure and an evaporation structure are provided in the separator, the separation structure is used to separate the quinoline insoluble material and discharge it from the quinoline insoluble material outlet, and the evaporation structure is used to separate the solvent and lead it out through the solvent volatiles outlet pipe; Asphalt reactor: The asphalt reactor is arranged between the anthracene oil distillation tower and the flash tower, and is provided with a partition plate inside. The partition plate is used for first-in-first-out and last-in-last-out of materials. The top of the asphalt reactor is provided with a superheated steam inlet and a volatile matter outlet, and the side is provided with a side feed port and a side discharge port. A regulating valve is provided at the side discharge port along the height direction.

2. The system for preparing high softening point and low quinoline insoluble modified asphalt according to claim 1, characterized in that: A constant temperature water bath structure is arranged in the mixing box, and the constant temperature water bath structure is used for treating the internal materials at a constant temperature.

3. The system for preparing high softening point and low quinoline insoluble modified asphalt according to claim 1, characterized in that: The separation structure comprises: An inner separation part, the bottom of which is provided with a blocking plate; The outer separation part has a baffle plate at the top, which is fixed on the inner wall of the separator, a gap is reserved between the lower surface of the baffle plate and the top of the inner separation part, and a baffle ring extending downward is installed on the inner ring; The guide part includes a plurality of guide members 1 and a plurality of guide members 2. The guide members 1 are arranged between the inner separation part and the outer separation part. The guide members 1 are arranged in a spiral distribution from top to bottom and the top starting position is located on the lower surface of the baffle. The guide members 2 are located on the outer separation part below the inner separation part. The guide members 2 are arranged in a spiral distribution from top to bottom and the top starting position is located on the trend line of the guide members 1.

4. The system for preparing modified asphalt with high softening point and low quinoline insolubles according to claim 3, characterized in that: The guide member 1 and the guide member 2 both include a mounting plate 1 and a guide plate, the mounting plate 1 is provided with a connection hole 1, the connection hole 1 is used to connect the external separation structure, the guide plate is used to guide the quinoline insoluble matter downward, and the angle between the side of the guide plate away from the mounting plate 1 and the direction facing the quinoline insoluble matter on the horizontal cross section is an acute angle; The guide plate 1 also includes a mounting plate 2, on which a connecting hole 2 is provided, and the connecting hole 2 is used for connecting the inner separation structure.

5. The system for preparing modified asphalt with high softening point and low quinoline insolubles according to claim 1, characterized in that: The partition plate is arranged obliquely to divide the internal area of ​​the asphalt reactor into a pretreatment zone and a reaction zone. The pretreatment zone is larger at the top and smaller at the bottom, while the reaction zone is smaller at the top and larger at the bottom.

6. The system for preparing modified asphalt with high softening point and low quinoline insolubles according to claim 1, characterized in that: The evaporation structure comprises a heating tube embedded in the inner wall of the separator and a heat conducting plate covering the outer side of the heating tube and coplanar with the inner wall of the separator.

7. The system for preparing modified asphalt with high softening point and low quinoline insolubles according to claim 1, characterized in that: The separator is arranged to rotate relative to the feed box, and a transmission structure is arranged at the bottom of the separator, and a driving mechanism is connected via the transmission structure. The driving mechanism is a combination of a motor and a reducer, and the driving mechanism drives the separator to rotate via the transmission structure.

8. The system for preparing modified asphalt with high softening point and low quinoline insolubles according to claim 1, characterized in that: A connecting flange and a discharge box are installed at the bottom of the separator, the discharge box and the connecting flange are rotatably installed, and the discharge box is used to collect materials after the solvent is separated. A discharge pipe and a collecting pipe are arranged on the discharge box. The top of the collecting pipe is a trumpet-shaped structure for collecting quinoline insolubles, and a discharge port is arranged at the bottom.

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