Polymerization tower for modifying asphalt and system adopting polymerization tower

Abstract

The invention relates to a polymerization tower, in particular to a polymerization tower for asphalt modification, which comprises a vent hole, an outer heater, an atomizer, a feed inlet, a liquid collecting part, a special-shaped tray and a liquid outlet, and the vent hole, the atomizer, the feed inlet, the liquid collecting part, the special-shaped tray and the liquid outlet are vertically sleeved in the polymerization tower. The invention also designs an asphalt modification system using the polymerization tower. The polymerization tower realizes uniform temperature of materials, the polymerization time of the materials in the tower is basically consistent, and the problem of over-polymerization of part of the materials caused by non-uniform temperature field of a conventional polymerization kettle and a flowing dead zone of equipment is solved.

Description

Technical Field

[0001] The invention relates to a polymerization tower, in particular to a polymerization tower for asphalt modification. Background Art

[0002] Asphalt, as an important basic material, is widely used in many fields such as road construction and building waterproofing. With the development of economy and the advancement of science and technology, the quality requirements for asphalt products are getting higher and higher, and traditional modification technology can no longer meet the needs of modern industry.

[0003] At present, the commonly used asphalt modification technology in the market mainly includes intermittent modification using conventional polymerization reactors. Although this method can improve the quality of asphalt to a certain extent, it still has the following shortcomings in actual production: Uneven temperature field: Due to the uneven temperature distribution inside the polymerization kettle, some materials may be over-polymerized, affecting the quality of the final product.

[0004] Long production cycle: The intermittent operation mode makes the entire production process time-consuming, which is not conducive to large-scale continuous production.

[0005] High energy consumption: Intermittent production requires frequent starts and stops, resulting in energy waste.

[0006] Unable to achieve continuous production: The intermittent production mode limits the scale of industrial applications.

[0007] Although there are some improved upgrading technologies on the market, most of the literature still focuses on how to optimize the existing batch polymerization reactors, and an ideal solution has not yet been found. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes a polymerization tower for asphalt modification, which achieves uniform temperature of the materials and basically consistent polymerization time of the materials in the tower, thus overcoming the problem of over-polymerization of some materials caused by uneven temperature field of conventional polymerization kettles and dead zone of equipment flow, as described below.

[0009] A polymerization tower for asphalt modification comprises an exhaust hole, a heat treatment part, a feed port and a material collection part. The heat treatment part comprises an external heater and an atomizer. The external heater is installed on the outer wall of the polymerization tower. The exhaust hole, the atomizer and the feed port are located above the liquid level and are mounted in the polymerization tower from top to bottom. The material collecting part includes a liquid collecting part, a special-shaped tower plate and a liquid discharge port. The special-shaped tower plates are paired tower plates with different shapes. The liquid collecting part, the special-shaped tower plate and the liquid discharge port are all located below the liquid level and are mounted in the polymerization tower from top to bottom. The liquid collecting part pumps the collected material to the atomizer.

[0010] Preferably, the atomizer is an annular eccentric combined atomizing nozzle, and the liquid flows down along the tower wall through the eccentric nozzle spray, thereby increasing the contact area between the material and the tower wall and enhancing the heat exchange efficiency.

[0011] Preferably, the liquid collecting portion is an annular liquid collecting port, which can minimize the deviation of materials in the tower.

[0012] The polymerization tower for asphalt modification as described above also includes a demister, which is installed between the exhaust hole and the atomizer. The demister can minimize the asphalt liquid droplets entrained in the flue gas during the vacuum exhaust process.

[0013] The polymerization tower for asphalt modification as described above also includes an umbrella-shaped distributor, which is installed below the feed port. This arrangement allows the feed and the circulating liquid to be evenly mixed on the one hand, and on the other hand, the material flows down along the tower wall and the narrow slits of the umbrella-shaped distributor, which can improve the heat exchange effect.

[0014] In the polymerization tower for asphalt modification as described above, the external heater is arranged below the liquid surface, so that the heating efficiency is higher. The heating temperature range of the external heater is 340°C to 420°C, preferably 370°C to 420°C.

[0015] As mentioned above, the polymerization tower for asphalt modification has 1 to 6 pairs of special-shaped trays, preferably 4 pairs. The special-shaped trays can make the materials descend evenly to ensure that the polymerization time of the materials is basically consistent.

[0016] In the above-mentioned polymerization tower for asphalt modification, the exhaust method of the exhaust hole is vacuum exhaust.

[0017] The polymerization tower for asphalt modification as described above can be connected in series in multiple stages.

[0018] A bitumen modification system has also been designed using a polymerization tower as described above.

[0019] The asphalt modification system described above uses a dispersed delivery pump to input materials, which can stir the materials with high intensity and inhibit the generation of macromolecular asphalt.

[0020] The present invention has the following beneficial effects: (1) Temperature field uniformity: The design of annular eccentric combined atomizing nozzles and multi-layer special-shaped trays achieves uniform distribution of materials in the tower, ensures the consistency of the temperature field, and effectively avoids the occurrence of local over-aggregation; (2) Improved production efficiency: The continuous production method greatly shortens the production cycle and improves production efficiency; (3) Reduced energy consumption: Optimized heat utilization design, combined with electric heating or molten salt heating, effectively reduces energy consumption; (4) Continuous production: The equipment structure and control strategy have been improved to achieve continuous production of asphalt modification, meeting the needs of large-scale industrial applications; (5) Product quality improvement: Through optimized process parameter control, key performance indicators of asphalt products such as softening point, toluene insoluble matter, quinoline insoluble matter, coking value and volatile matter have been significantly improved; (6) Easy equipment maintenance: The equipment design takes into account the need for easy maintenance and overhaul, which reduces maintenance costs and reduces downtime; (7) Environmental performance: The design of the top demister reduces the problem of asphalt droplets being entrained in flue gas, which helps reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the polymerization tower of the present invention.

[0022] Figure 2 Schematic diagram of the asphalt modification system with four-stage series polymerization towers. DETAILED DESCRIPTION

[0023] The following is a detailed description with reference to the accompanying drawings and specific implementation methods.

[0024] like Figure 1 As shown, the present invention provides a polymerization tower for asphalt modification, comprising a vent 1, a heat treatment part, a feed port 4 and a material collection part. The heat treatment part includes an external heater 7 and an atomizer 3. The external heater 7 is installed on the outer wall of the polymerization tower. The exhaust hole 1, the atomizer 3 and the feed port 4 are located above the liquid level 6 and are installed in the polymerization tower from top to bottom. The material collection part includes a liquid collecting part, a circulation part, a special-shaped tower plate 9 and a liquid discharge port 10. The special-shaped tower plate 9 is a pair of tower plates with different shapes. The liquid collecting part, the special-shaped tower plate 9 and the liquid discharge port 10 are all located below the liquid level 6 and are mounted in the polymerization tower from top to bottom. The liquid collecting part 8 pumps the collected material to the atomizer 3.

[0025] Preferably, the atomizer 3 is an annular eccentric combined atomizing nozzle, which increases the contact area between the material and the tower wall and enhances the heat exchange efficiency.

[0026] Preferably, the liquid collecting portion 8 is an annular liquid collecting port, which can minimize the deviation of materials in the tower.

[0027] The asphalt modification polymerization tower as described above further comprises a demister 2, which is installed between the exhaust hole 1 and the atomizer 3. The demister 2 can minimize the asphalt liquid droplets entrained in the flue gas during the vacuum exhaust process.

[0028] The polymerization tower for asphalt modification as described above also includes an umbrella-shaped distributor 5, which is installed below the feed port 4. This arrangement allows the feed and the circulating liquid to be evenly mixed on the one hand, and on the other hand, the material flows down along the tower wall and the narrow slits of the umbrella-shaped distributor 5, which can improve the heat exchange effect.

[0029] In the polymerization tower for asphalt modification as described above, the external heater 7 is arranged below the liquid level 6, and the heating efficiency is higher. The heating temperature range of the external heater 7 is 340°C to 420°C, and preferably, the heating temperature range is 370°C to 420°C.

[0030] As mentioned above, the polymerization tower for asphalt modification has 1 to 6 pairs of special-shaped trays 9. Preferably, 4 pairs of special-shaped trays 9 are provided. The special-shaped trays 9 can make the materials descend evenly and ensure that the polymerization time of the materials is basically consistent.

[0031] In the above-mentioned polymerization tower for asphalt modification, the exhaust method of the exhaust hole 1 is vacuum exhaust.

[0032] The polymerization tower for asphalt modification as described above can be connected in series in multiple stages.

[0033] like Figure 2 As shown, an asphalt modification system using the above-mentioned polymerization tower is also provided.

[0034] The asphalt modification system as described above uses a dispersed delivery pump 21 to input materials, and can stir the materials with high intensity to inhibit the generation of macromolecular asphalt.

[0035] The following examples show the asphalt product indicators under different process parameters, using a four-stage series system, a polymerization tower with a diameter of 400 mm, and electric heating. The raw asphalt indicators are as follows:

[0036] Embodiment 1: In this embodiment, the polymerization temperature is set to 370° C., the feed rate is 400 L / h, and the vacuum degree is -0.08 MPa.

[0037] The indicators of modified asphalt products are as follows:

[0038] Embodiment 2: In this embodiment, the polymerization temperature is set to 380° C., the feed rate is 300 L / h, and the vacuum degree is -0.08 MPa.

[0039] The indicators of modified asphalt products are as follows:

[0040] Embodiment three: In this embodiment, the polymerization temperature is set to 400° C., the feed rate is 400 L / h, and the vacuum degree is -0.08 MPa.

[0041] The indicators of modified asphalt products are as follows:

[0042] Embodiment 4: In this embodiment, the polymerization temperature is set to 400° C., the feed rate is 300 L / h, and the vacuum degree is -0.05 MPa.

[0043] The indicators of modified asphalt products are as follows:

[0044] Embodiment five: In this embodiment, the polymerization temperature is set to 405° C., the feed rate is 300 L / h, and the vacuum degree is -0.07 MPa.

[0045] The indicators of modified asphalt products are as follows:

[0046] Embodiment six: In this embodiment, the polymerization temperature is set to 408° C., the feed rate is 300 L / h, and the vacuum degree is -0.07 MPa.

[0047] The indicators of modified asphalt products are as follows:

[0048] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0049] Although the above describes the specific implementation methods of the present invention, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A polymerization tower for asphalt modification, characterized in that: It comprises an exhaust hole (1), a heat treatment part, a feed port (4) and a material collection part. The heat treatment section comprises an external heater (7) and an atomizer (3), wherein the external heater (7) is installed on the outer wall of the polymerization tower. The exhaust hole (1), the atomizer (3) and the feed port (4) are located above the liquid surface (6) and are mounted vertically in the polymerization tower. The material collection section comprises a liquid collection section (8), a one-way valve (11), a special-shaped tower tray (9) and a liquid discharge port (10). The liquid collection section (8), the special-shaped tower tray (9) and the liquid discharge port (10) are all located below the liquid surface (6) and are mounted vertically in the polymerization tower. The liquid collection section (8) pumps the collected material to the atomizer (3) through the one-way valve (11).

2. A polymerization tower for asphalt modification as claimed in claim 1, characterized in that: It also comprises a demister (2), wherein the demister (2) is installed between the exhaust hole (1) and the atomizer (3).

3. The asphalt modification polymerization tower according to claim 1, characterized in that: It also comprises an umbrella-shaped distributor (5), wherein the umbrella-shaped distributor (5) is installed below the feed inlet (4).

4. The asphalt modification polymerization tower according to claim 1, characterized in that: The external heater (7) is arranged below the liquid surface (6), and the heating temperature range of the external heater (7) is 340° C. to 420° C.

5. The asphalt modification polymerization tower according to claim 1, characterized in that: The special-shaped tower trays (9) are paired tower trays with different shapes, and there are 1 to 6 pairs.

6. The asphalt modification polymerization tower according to claim 1, characterized in that: The exhaust method of the exhaust hole (1) is vacuum exhaust.

7. The asphalt modification polymerization tower according to claim 1, characterized in that: Can be connected in series in multiple stages.

8. The asphalt modification polymerization tower according to claim 1, characterized in that: The atomizer (3) is an annular eccentric combined atomizing nozzle, and the liquid collecting portion (8) is an annular liquid collecting port.

9. An asphalt modification system, characterized in that: Use the polymerization tower according to any one of claims 1 to 8.

10. The asphalt modification polymerization tower according to claim 9, characterized in that: Use a dispersed delivery pump (21) to input the material.

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