Roof ridge type devolatilization tower with heat energy circulation

Abstract

The utility model relates to the technical field of devolatilization towers, and discloses a ridge type devolatilization tower with heat energy circulation, which comprises a devolatilization tower, a bag-type dust collector is arranged on one side of the devolatilization tower, a material inlet is arranged on the upper part of the devolatilization tower, a material outlet is arranged at the bottom end of the devolatilization tower, and the bag-type dust collector is arranged on the other side of the devolatilization tower. A tail gas outlet and a powder outlet are sequentially formed in the upper part and the lower part of the bag-type dust collector; and a preheating section outlet, a devolatilization section inlet, a precooling section inlet and a cooling section inlet are sequentially formed in the left side of the devolatilization tower. The heat energy circulation ridge type devolatilization tower is compact in structure, materials are devolatilized through the devolatilization tower, meanwhile, dust removal is conducted on the materials through the bag-type dust collector, the devolatilization and dust removal functions are integrated, the continuous self-cleaning function is achieved, the tower can run for a long time, normal-temperature air is driven through an inlet of the cooling section to cool the treated materials, and the cooling efficiency is improved. And circulation is avoided, so that equipment is greatly simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of devolatilization towers, in particular to a ridge-type devolatilization tower with heat energy circulation. Background Art

[0002] As the requirements for polypropylene products in the automotive, food and other industries are increasing, the VOC content of most existing polypropylene products cannot meet the requirements of downstream manufacturers. Therefore, in recent years, the industry has developed a variety of VOC deep removal technologies and proprietary equipment for polypropylene pellets.

[0003] As for the equipment for removing polypropylene pellets, two shortcomings of the traditional ridge-type devolatilization tower were exposed during use. First, fine powder will be produced during the self-air conveying process of polypropylene pellets. These fine powders will pass through the ridge tower and enter the system. Long-term operation will cause damage to the fan and heat exchanger. Second, the existing polypropylene pellet VOC deep removal ridge tower adopts a three-stage structure of heating, devolatilization, and cooling. The polypropylene material is maintained at 120°C in the devolatilization stage. Polypropylene at 120°C will oxidize in the air environment to produce new VOCs, so nitrogen cooling is required. The hot nitrogen used in the heating and devolatilization stages needs to use steam heat exchange, and the nitrogen in the cooling stage needs cooling water to cool down. This process consumes a lot of steam, which in turn causes heat energy waste.

[0004] Patent document CN215924824U discloses a gas phase polyethylene process powder devolatilization device, which adopts multiple cycles of devolatilization of polymer powder to improve the devolatilization efficiency and completely remove the volatile components, but its structure is complex and inconvenient to install. Utility Model Content

[0005] In view of the deficiencies of the above-mentioned prior art, the utility model provides a ridge-type devolatilization tower with thermal energy circulation, which has the advantages of being equipped with a first circulation pipe between the preheating section outlet and the precooling section inlet, and a second circulation pipe between the preheating section inlet and the precooling section outlet. After the preheating section inlet and the preheating section outlet preheat the material, the heated nitrogen refluxes to the inside of the precooling section inlet and the precooling section outlet, so that the nitrogen circulation can be used to precool the material, thereby reducing energy loss, thereby solving the problems raised in the above-mentioned background technology.

[0006] The utility model provides the following technical scheme: a ridge-type devolatilization tower for heat energy circulation, comprising a devolatilization tower, a bag dust collector is placed on one side of the devolatilization tower, a material inlet is installed on the upper part of the devolatilization tower, a material outlet is installed on the bottom end of the devolatilization tower, an exhaust gas outlet and a powder outlet are installed in sequence on the upper and lower parts of the bag dust collector, a preheating section outlet, a devolatilization section inlet, a precooling section inlet and a cooling section inlet are installed in sequence on the left side of the devolatilization tower, a preheating section inlet, a devolatilization section outlet, a precooling section outlet and a cooling section outlet are opened in sequence on the right side of the devolatilization tower, a first circulation pipe is installed outside the preheating section outlet and the precooling section inlet, a second circulation pipe is installed between the preheating section inlet and the precooling section outlet, a first connecting pipe is installed outside the devolatilization section outlet, a second connecting pipe is provided on the upper part of the exhaust gas outlet, and a second heating device is installed inside the second connecting pipe.

[0007] Preferably, the interior of the devolatilization tower is divided into four areas, and a ridge tower is installed between each area.

[0008] Preferably, a first heating device is installed inside the second circulation pipe, and the interior of the second circulation pipe is filled with nitrogen. At the same time, the nitrogen enters the interior of the devolatilization tower through the material inlet, and the output nitrogen enters the interior of the devolatilization tower through the pre-cooling section inlet.

[0009] Preferably, the other end of the second connecting pipe is connected to the inlet of the devolatilization section, and the other end of the first connecting pipe is connected to the outlet of the devolatilization section.

[0010] Preferably, the outside of the cooling section inlet is interconnected with the air, and an air pump is installed outside the second heating device.

[0011] Preferably, the first heating device and the second heating device both comprise a heater and a fan, and the first heating device and the second heating device are arranged outside the devolatilization tower.

[0012] Compared with the existing ridge-type devolatilization tower with heat energy circulation, the utility model has the following beneficial effects:

[0013] 1. The ridge-type devolatilization tower of the heat energy circulation has a compact structure. The material is devolatilized through the devolatilization tower, and the bag dust collector removes dust from the material at the same time, that is, it has the functions of devolatilization and dust removal in one. It has a continuous self-cleaning function and can run for a long time. It drives the normal temperature air through the cooling section inlet to cool the treated material without circulation, which greatly simplifies the equipment and process.

[0014] 2. Compared with the three-section structure of the traditional devolatilization tower, the ridge-type devolatilization tower of the heat energy circulation preheats the material inside the devolatilization tower to 80° through the preheating section inlet and the preheating section outlet, and at the same time, the devolatilization section inlet and the devolatilization section outlet drive the material at 80° to heat to 120° for devolatilization, and when the heated material passes between the precooling section inlet and the precooling section outlet, the 120° material is cooled to 80° for precooling, and the air is driven to be transported to the inside of the devolatilization tower through the cooling section inlet again, and the material precooled to 80° is cooled to 60°, which then plays a cooling role, thereby improving the devolatilization treatment effect of the material. At the same time, the inlet and outlet of the preheating section and the precooling section are directly connected to realize the self-circulation of nitrogen and complete the heat exchange, and the energy consumption is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 This is a side view of the structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the front view structure of the utility model;

[0018] Figure 4 It is a partial enlarged structural schematic diagram of the devolatilization tower of the utility model.

[0019] In the figure: 1. devolatilization tower; 2. bag filter; 3. material inlet; 4. material outlet; 5. tail gas outlet; 6. powder outlet; 7. preheating section inlet; 8. preheating section outlet; 9. precooling section inlet; 10. precooling section outlet; 11. first circulation pipe; 12. second circulation pipe; 13. first heating equipment; 14. devolatilization section inlet; 15. devolatilization section outlet; 16. first connecting pipe; 17. second connecting pipe; 18. second heating equipment; 19. cooling section inlet; 20. cooling section outlet. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 , Figure 2 , Figure 3 and Figure 4A ridge-type devolatilization tower with heat energy circulation comprises a devolatilization tower 1, a bag dust collector 2 is placed on one side of the devolatilization tower 1, the bag dust collector 2 filters the passing gas, a material inlet 3 is installed on the upper part of the devolatilization tower 1, a material outlet 4 is installed at the bottom of the devolatilization tower 1, the material inlet 3 drives the material transportation, and the material outlet 4 drives the treated material to be discharged, the upper and lower parts of the bag dust collector 2 are successively installed with an exhaust gas outlet 5 and a powder outlet 6, the exhaust gas outlet 5 discharges the treated gas, the left side of the devolatilization tower 1 is successively installed with a preheating section outlet 8, a devolatilization section inlet 14, a precooling section inlet 9 and a cooling section inlet 19, and the right side of the devolatilization tower 1 is successively opened with a preheating section inlet 7, a devolatilization section outlet 15, a precooling section outlet 10 and a cooling section outlet 20, which drive nitrogen mutually through pipelines. The gas transmission can heat and cool the material inside the devolatilization tower 1. A first circulation pipe 11 is installed outside the preheating section outlet 8 and the precooling section inlet 9. A second circulation pipe 12 is installed between the preheating section inlet 7 and the precooling section outlet 10. The first circulation pipe 11 and the second circulation pipe 12 drive the preheating section inlet 7, the preheating section outlet 8, the precooling section inlet 9 and the precooling section outlet 10 to form a circulation room. A first connecting pipe 16 is installed outside the devolatilization section outlet 15. A second connecting pipe 17 is arranged on the upper part of the tail gas outlet 5, and a second heating device 18 is installed inside the second connecting pipe 17. The first connecting pipe 16 and the second connecting pipe 17 drive the bag filter 2 to form a circulation space with the devolatilization section inlet 14 and the devolatilization section outlet 15 installed outside the devolatilization tower 1.

[0022] See also Figure 4 The interior of the devolatilization tower 1 is divided into four areas, and a ridge tower is installed between each area. The ridge tower belongs to the prior art and is not improved in this application, so it is not elaborated. By dividing the interior of the devolatilization tower 1 into four areas, and installing a ridge tower in each area, the preheating section inlet 7 and the preheating section outlet 8, the devolatilization section inlet 14 and the devolatilization section outlet 15, the precooling section inlet 9 and the precooling section outlet 10, and the cooling section inlet 19 and the cooling section outlet 20 are driven to circulate in sequence, avoiding the phenomenon of mutual mixing, thereby improving the stability of gas transmission.

[0023] See also Figure 1 and Figure 3, a first heating device 13 is installed inside the second circulation pipe 12, and the interior of the second circulation pipe 12 is filled with nitrogen. At the same time, the nitrogen passes through the material inlet 3 and enters the interior of the devolatilization tower 1. At the same time, the output nitrogen enters the interior of the devolatilization tower 1 through the pre-cooling section inlet 9. The first heating device 13 is installed through the second circulation pipe 12. The first heating device 13 heats the nitrogen passing through and generates a driving force to push the nitrogen to be transported to the interior of the devolatilization tower 1. The heated nitrogen heats the material inside the devolatilization tower 1 to 80°, and at the same time, it refluxes to the interior of the first circulation pipe 11 through the preheating section outlet 8. At the same time, after the nitrogen heats the material, the nitrogen is cooled, and the cooled nitrogen is transported to the interior of the devolatilization tower 1 again through the pre-cooling section inlet 9. The pre-cooling section inlet 9 preliminarily cools the material heated to 120° inside the devolatilization tower 1, and refluxes to the interior of the second circulation pipe 12 through the pre-cooling section outlet 10, and then forms a cycle time for material heating and cooling, and reduces energy loss.

[0024] See also Figure 3 The other end of the second connecting pipe 17 is interconnected with the devolatilization section inlet 14, and the other end of the first connecting pipe 16 is interconnected with the devolatilization section outlet 15. The other end of the second connecting pipe 17 is interconnected with the devolatilization section inlet 14, that is, the second connecting pipe 17 heats the gas and transports it to the inside of the devolatilization tower 1 through the devolatilization section inlet 14. The gas transported to the inside of the devolatilization tower 1 heats the material preliminarily heated to 80° to 120°. At the same time, the preliminarily cooled gas refluxes to the inside of the bag filter 2 through the first connecting pipe 16, thereby forming a reflux zone, which can filter impurities in the passing gas and play a self-cleaning role.

[0025] See also Figure 3 The outside of the cooling section inlet 19 is interconnected with the air, and an air pump is installed outside the second heating device 18 to drive air into the interior of the devolatilization tower 1 through the cooling section inlet 19. The cooling section inlet 19 can drive the gas to cool the gas transported to the lower end of the interior of the devolatilization tower 1.

[0026] See also Figure 2 and Figure 3 The first heating device 13 and the second heating device 18 both include a heater and a fan. The first heating device 13 and the second heating device 18 are arranged outside the devolatilization tower 1. A heater and a fan are arranged inside the first heating device 13 and the second heating device 18. The heater heats the passing gas, and the fan provides power when driving the gas transmission.

[0027] Working principle: When in use, the material enters the interior of the devolatilization tower 1 through the material inlet 3, falls from top to bottom in a plug flow, and the first heating device 13 is started. The first heating device 13 heats the nitrogen inside the second circulation pipe 12. At the same time, the heated nitrogen is transported to the interior of the devolatilization tower 1 through the preheating section inlet 7. At the same time, after the nitrogen crosses the material inside the devolatilization tower 1, the material is heated to 80°C, and the hot nitrogen cools down at the same time. At the same time, the second heating device 18 installed in the second connecting pipe 17 is started. The second heating device 18 drives the nitrogen to heat to 120°. The 120°C hot nitrogen devolatilization section inlet 14 to the devolatilization section outlet 15 crosses the material inside the devolatilization tower 1. At the same time, the material is heated to 120°C, and the nitrogen output through the devolatilization section outlet 15 enters the bag filter 2 through the first connecting pipe 16, and the nitrogen is discharged from the tail gas outlet 5. The nitrogen gas is heated by the hot material and then discharged through the precooling section outlet 10. The nitrogen gas is transported to the second circulation pipe 12. The second circulation pipe 12 drives the nitrogen gas to circulate and heat again. After the 80°C material passes through an isolation section, it enters the cooling section. The room temperature air is transported to the interior of the devolatilization tower 1 through the cooling section inlet 19 to cool the material. At the same time, the room temperature air is discharged through the cooling section outlet 20. The material is cooled from 80°C to 60°C. At this point, the material is discharged to the packaging unit through the material outlet 4 at the bottom of the devolatilization tower.

[0028] Experiments have shown that the utility model realizes efficient circulation of heat energy between the preheating section and the precooling section through the arrangement of the first circulation pipe and the second circulation pipe, improves the heat energy utilization rate of the overall system, and reduces energy consumption. The connection between the preheating section outlet and the precooling section inlet, and the preheating section inlet and the precooling section outlet enables heat energy to be transferred and recovered between different stages, further optimizing the use of heat energy. The arrangement of the bag filter effectively captures dust in the processing process, reduces environmental pollution, and improves the cleanliness of the working environment. The dust is discharged through the powder outlet at the bottom of the bag filter, realizing centralized treatment and recovery of dust. The preheating section outlet, the devolatilization section inlet, the precooling section inlet and the cooling section inlet arranged in sequence on the left side of the devolatilization tower, as well as the corresponding inlet and outlet on the right side, constitute a complete multi-stage processing flow, so that the material can be fully processed and reacted at different stages, improving the overall processing efficiency and quality. The connection between the exhaust gas outlet and the upper part of the bag filter allows the exhaust gas to be dust-removed before being discharged, reducing the dust content in the exhaust gas. The setting of the second connecting pipe and the second heating device inside it not only provides further heating treatment for the exhaust gas, but also helps to recover the heat energy in the exhaust gas, thereby improving the overall thermal energy utilization efficiency of the system. The ridge-type design may help to optimize space utilization, making the equipment more compact and efficient in layout. The setting of the material inlet and material outlet facilitates the addition and discharge of materials and improves the convenience of operation. The ridge-type devolatilization tower with thermal energy circulation achieves efficient, environmentally friendly and energy-saving treatment effects through technical advantages such as efficient circulation and thermal energy utilization, integration of bag filters, multi-stage treatment process, exhaust gas treatment and thermal energy recovery, and optimization of structure and design.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ridge-type devolatilization tower for heat energy circulation, comprising a devolatilization tower (1), a bag dust collector (2) is placed on one side of the devolatilization tower (1), a material inlet (3) is installed at the top of the devolatilization tower (1), a material outlet (4) is installed at the bottom of the devolatilization tower (1), an exhaust gas outlet (5) and a powder outlet (6) are installed in sequence at the top and bottom of the bag dust collector (2), characterized in that: The left side of the devolatilization tower (1) is provided with a preheating section outlet (8), a devolatilization section inlet (14), a precooling section inlet (9) and a cooling section inlet (19) in sequence, and the right side of the devolatilization tower (1) is provided with a preheating section inlet (7), a devolatilization section outlet (15), a precooling section outlet (10) and a cooling section outlet (20) in sequence. A first circulation pipe (11) is installed outside the preheating section outlet (8) and the precooling section inlet (9), a second circulation pipe (12) is installed between the preheating section inlet (7) and the precooling section outlet (10), a first connecting pipe (16) is installed outside the devolatilization section outlet (15), a second connecting pipe (17) is provided on the upper part of the tail gas outlet (5), and a second heating device (18) is installed inside the second connecting pipe (17).

2. The ridge-type devolatilization tower for thermal energy circulation according to claim 1, characterized in that: The interior of the devolatilization tower (1) is divided into four areas, and a ridge tower is installed between each area.

3. The ridge-type devolatilization tower for heat energy circulation according to claim 1, characterized in that: The interior of the second circulation pipe (12) is provided with a first heating device (13), and the interior of the second circulation pipe (12) is filled with nitrogen. The nitrogen enters the interior of the devolatilization tower (1) through the material inlet (3), and the output nitrogen enters the interior of the devolatilization tower (1) through the precooling section inlet (9).

4. The ridge-type devolatilization tower for thermal energy circulation according to claim 1, characterized in that: The other end of the second connecting pipe (17) is connected to the devolatilization section inlet (14), and the other end of the first connecting pipe (16) is connected to the devolatilization section outlet (15).

5. The ridge-type devolatilization tower for thermal energy circulation according to claim 1, characterized in that: The outside of the cooling section inlet (19) is in communication with the air, and an air pump is installed outside the second heating device (18).

6. The ridge-type devolatilization tower for heat energy circulation according to claim 3, characterized in that: The first heating device (13) and the second heating device (18) both comprise a heater and a fan, and the first heating device (13) and the second heating device (18) are arranged outside the devolatilization tower (1).

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