Device for producing modified coal pitch through serial connection of steam stripping and reduced pressure distillation

Abstract

The utility model relates to the technical field of clean production of coal tar processing, and discloses a steam stripping and reduced pressure distillation series production modified coal pitch device which comprises a reduced pressure distillation tower, a tubular heating furnace, a steam stripping modification reactor, a negative pressure flash tower and a modified pitch finished product tank, the bottom of the front end of the reduced pressure distillation tower is fixedly connected with a material outlet I, the rear end of the reduced pressure distillation tower is fixedly connected with a gas phase extraction port I, and the right end of the reduced pressure distillation tower is fixedly connected with a material inlet II; and the other end of the material inlet II passes through the tubular heating furnace and is fixedly connected to the left end of the steam stripping modification reactor. According to the utility model, the steam stripping device and the reduced pressure distillation device are connected in series for production to remove light components in the asphalt, so that the viscosity of the asphalt is reduced, the asphalt is more suitable for the subsequent reduced pressure distillation process, the yield and the quality of the modified coal pitch are improved, and the modified asphalt with different specifications is produced.

Description

Technical Field

[0001] The utility model relates to the technical field of clean production in coal tar processing, in particular to a device for producing modified coal tar pitch by series connection of stripping and vacuum distillation. Background Technique

[0002] Modified coal tar pitch is prepared from medium-temperature pitch after distilling and extracting fractions from coal tar. When heating and modifying the medium-temperature pitch, the aromatic hydrocarbon molecules in the pitch undergo thermal polymerization and condensation, and finally modified coal tar pitch is produced through vacuum distillation. Modified coal tar pitch is widely used in the binder of anodic paste for electrolytic aluminum and carbon products.

[0003] When the coal tar processing volume reaches the upper limit, the softening point, TI, QI, β resin, and coking value of the modified coal tar pitch produced by the existing device are limited within a certain range, and the output and quality target requirements of the modified coal tar pitch cannot be met. Moreover, the energy consumption of the heating furnace is relatively large, reducing the economic benefits of production. Therefore, it is necessary to improve the current production process to meet different requirements. For this purpose, a device for producing modified coal tar pitch by series connection of stripping and vacuum distillation is proposed to solve the above problems. Summary of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a device for producing modified coal tar pitch by series connection of stripping and vacuum distillation, aiming to improve the problem that the output and quality target requirements of the modified coal tar pitch cannot be met in the existing technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A device for producing modified coal tar pitch by series connection of stripping and vacuum distillation includes a vacuum distillation column, a tubular heating furnace, a stripping and modification reactor, a vacuum flash tank, and a modified pitch product tank. The left end of the vacuum distillation column is fixedly connected with a vacuum tower material inlet, the bottom of the front end of the vacuum distillation column is fixedly connected with a material outlet 1, the rear end of the vacuum distillation column is fixedly connected with a gas phase extraction port 1, the right end of the vacuum distillation column is fixedly connected with a material inlet 2, the other end of the material inlet 2 passes through the tubular heating furnace and is fixedly connected to the left end of the stripping and modification reactor. The top of the stripping and modification reactor is fixedly connected with a gas phase extraction port 2, the front end of the stripping and modification reactor is fixedly connected with a discharge port, the other end of the discharge port is fixedly connected to the left end of the modified pitch product tank. The left end of the stripping and modification reactor is fixedly connected with a high-pressure steam connection port, the bottom of the front end of the stripping and modification reactor is fixedly connected with a material outlet 3, the other end of the gas phase extraction port 1 is fixedly connected with an adjustment component 1, the rear end of the vacuum flash tank is fixedly connected with a gas phase extraction port 3, and the other end of the gas phase extraction port 3 is fixedly connected with an adjustment component 2;

[0007] As a further description of the above technical solution:

[0008] The first regulating component includes a first heat exchanger, the right end of the first heat exchanger is fixedly connected to the other end of the first gas-phase extraction outlet, an anthracene oil receiving tank is fixedly connected to the front end of the first heat exchanger, and a first vacuum pump is fixedly connected to the left end of the anthracene oil receiving tank;

[0009] As a further description of the above technical solution:

[0010] The second regulating component includes a second heat exchanger, the left end of the second heat exchanger is fixedly connected to the other end of the third gas-phase extraction outlet, a second anthracene oil receiving tank is fixedly connected to the front end of the second heat exchanger, and a second vacuum pump is fixedly connected to the right end of the second anthracene oil receiving tank;

[0011] As a further description of the above technical solution:

[0012] The other end of the first material outlet is fixedly connected to the front end of the tubular heating furnace through an extraction pump, and the other end of the third material outlet is fixedly connected to the front end of the vacuum flash tank through another extraction pump;

[0013] As a further description of the above technical solution:

[0014] The bottom of the vacuum distillation column is fixedly connected with a bottom plate.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the utility model, the stripping and vacuum distillation devices are connected in series to produce and remove the light components in the asphalt, reduce the viscosity of the asphalt, make it more suitable for the subsequent vacuum distillation process, improve the output and quality of the modified coal tar pitch, and produce modified asphalt of different specifications to meet the needs of different customers.

[0017] 2. In the utility model, the whole production process is carried out in different negative pressure environments, which reduces the boiling point of the distillation medium, thereby reducing the heating temperature; the heat of the gas at the top of the vacuum distillation column and the vacuum flash tank is used to heat the coal tar through a heat exchanger, effectively recovering the waste heat. The whole asphalt modification process reduces the power consumption by 3% and reduces the natural gas consumption by 5%. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of a device for producing modified coal tar pitch by series connection of stripping and vacuum distillation proposed by the utility model;

[0019] Figure 2 is a structural schematic diagram of the gas-phase extraction outlet of the stripping and modification reactor of a device for producing modified coal tar pitch by series connection of stripping and vacuum distillation proposed by the utility model.

[0020] Legend Explanation:

[0021] 1. Vacuum distillation column; 2. Tube-type heating furnace; 3. Stripping and upgrading reactor; 4. Vacuum flash distillation column; 5. Modified pitch finished product tank; 6. Material inlet of vacuum distillation column; 7. First material outlet; 8. First gas-phase extraction outlet; 9. First heat exchanger; 10. Anthracene oil receiving tank; 11. First vacuum pump; 12. Second material inlet; 13. High-pressure steam connection port; 14. Second gas-phase extraction outlet; 15. Third material outlet; 16. Third gas-phase extraction outlet; 17. Second heat exchanger; 18. Di-anthracene oil receiving tank; 19. Second vacuum pump; 20. Discharge port; 21. Bottom plate. Specific implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Refer to Figure 1 - Figure 2 As shown in the figure, an embodiment provided by the present invention: A device for serially producing modified coal tar pitch by stripping and vacuum distillation, including a vacuum distillation column 1, a tube-type heating furnace 2, a stripping and upgrading reactor 3, a vacuum flash distillation column 4 and a modified pitch finished product tank 5. The left end of the vacuum distillation column 1 is fixedly connected with a material inlet 6 of the vacuum distillation column for receiving the coal tar pitch material to be processed. The bottom of the front end of the vacuum distillation column 1 is fixedly connected with a first material outlet 7, and this outlet is connected to the front end of the tube-type heating furnace 2 through a pumping pump to circulate and heat the material. The rear end of the vacuum distillation column 1 is fixedly connected with a first gas-phase extraction outlet 8 for discharging light gas-phase components. The right end of the vacuum distillation column 1 is fixedly connected with a second material inlet 12, and this inlet is connected to the left end of the stripping and upgrading reactor 3 through the tube-type heating furnace 2 to ensure that the material is fully heated before entering the stripping and upgrading reactor. The top of the stripping and upgrading reactor 3 is fixedly connected with a second gas-phase extraction outlet 14 for collecting the gas generated during the reaction process.

[0024] The front end of the stripping and upgrading reactor 3 is fixedly connected with a discharge port 20, and this discharge port is connected to the left end of the modified pitch finished product tank 5 through a pipeline for storing the modified pitch finished product. The left end of the stripping and upgrading reactor 3 is fixedly connected with a high-pressure steam connection port 13 for introducing high-pressure superheated steam to promote the reaction process. The bottom of the front end of the stripping and upgrading reactor 3 is fixedly connected with a third material outlet 15, and this outlet is connected to the front end of the vacuum flash distillation column 4 through a pumping pump to further process the heavy components in the material. The other end of the first gas-phase extraction outlet 8 is fixedly connected with an adjustment component 1, and this component includes a first heat exchanger 9.

[0025] The right end of the first heat exchanger 9 is fixedly connected to the other end of the first gas-phase extraction outlet 8 and is used for condensing the gas-phase product. The front end of the first heat exchanger 9 is fixedly connected to an anthracene oil receiving tank 10, which is used for collecting the condensed liquid. The left end of the receiving tank 10 is fixedly connected to a first vacuum pump 11, which is used for evacuating to adjust the negative pressure parameter at the top of the vacuum distillation column. The rear end of the vacuum flash distillation column 4 is fixedly connected to a third gas-phase extraction outlet 16, which is connected to the second regulating assembly. The second regulating assembly includes a second heat exchanger 17, which is used for condensing the gas-phase product. The left end of the second heat exchanger 17 is fixedly connected to the other end of the third gas-phase extraction outlet 16, and the front end is fixedly connected to a second anthracene oil receiving tank 18, which is used for collecting the condensed liquid. The right end of the second anthracene oil receiving tank 18 is fixedly connected to a second vacuum pump 19, which is used for evacuating to adjust the negative pressure parameter at the top of the flash distillation column. The bottom of the vacuum distillation column 1 is fixedly connected to a bottom plate 21 to provide structural support for the device.

[0026] Working principle: In actual production, soft pitch is the bottom material obtained by extracting the three-component fraction from the vacuum distillation column 1 in the previous process. The soft pitch is pumped through the vacuum distillation column material inlet 6 into the vacuum distillation column 1. The temperature at the bottom of the vacuum distillation column is controlled at 360 °C, and the bottom material of the vacuum distillation column is circulated and heated to 370 °C by the tubular heating furnace 2 and then returned to the vacuum distillation column; the temperature at the top of the column is controlled at 300 °C; the gas-phase part at the top of the column is extracted by the first vacuum pump 11 and exchanges heat with the raw coal tar in the first heat exchanger 9 to recover the waste heat of the gas-phase part, and the gas-phase part is condensed into a first anthracene oil product. A part of the bottom material of the vacuum distillation column 1 is pumped into the stripping and upgrading reactor 3. 1 MPa steam is introduced into the bottom of the upgrading reactor. The partial pressure of the gas-phase anthracene oil in the upgrading reactor is reduced. Under the condition that the total pressure of the reactor remains unchanged, the liquid-phase anthracene oil in the pitch accelerates its transfer to the gas phase, thereby increasing the SP value of the pitch; due to the dual stirring effects of the high-pressure steam and the reactor agitator, the high-temperature pitch undergoes an efficient polycondensation reaction in the column, which improves the TI, QI, β resin, and coking value of the pitch and shortens the residence time of the high-temperature pitch in the reactor. The pitch in the upgrading reactor finally removes the second anthracene oil through the vacuum flash distillation column 4 to obtain a qualified upgraded pitch product.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for producing modified coal tar pitch by the series connection of stripping and vacuum distillation, comprising a vacuum distillation column (1), a tubular heating furnace (2), a stripping and modification reactor (3), a vacuum flash distillation column (4), and a modified pitch product tank (5), characterized in that: The left end of the vacuum distillation column (1) is fixedly connected to a vacuum column material inlet (6), the bottom of the front end of the vacuum distillation column (1) is fixedly connected to a first material outlet (7), the rear end of the vacuum distillation column (1) is fixedly connected to a first gas-phase extraction outlet (8), the right end of the vacuum distillation column (1) is fixedly connected to a second material inlet (12), the other end of the second material inlet (12) passes through the tubular heating furnace (2) and is fixedly connected to the left end of the stripping and upgrading reactor (3), the top of the stripping and upgrading reactor (3) is fixedly connected to a second gas-phase extraction outlet (14), the front end of the stripping and upgrading reactor (3) is fixedly connected to a discharge port (20), the other end of the discharge port (20) is fixedly connected to the left end of the modified pitch product tank (5), the left end of the stripping and upgrading reactor (3) is fixedly connected to a high-pressure steam connection port (13), the bottom of the front end of the stripping and upgrading reactor (3) is fixedly connected to a third material outlet (15), the other end of the first gas-phase extraction outlet (8) is fixedly connected to a first regulating assembly, the rear end of the vacuum flash distillation column (4) is fixedly connected to a third gas-phase extraction outlet (16), and the other end of the third gas-phase extraction outlet (16) is fixedly connected to a second regulating assembly.

2. The modified coal tar pitch production device in series of steam stripping and vacuum distillation according to claim 1, characterized in that: The first regulating assembly includes a first heat exchanger (9), the right end of the first heat exchanger (9) is fixedly connected to the other end of the first gas-phase extraction outlet (8), the front end of the first heat exchanger (9) is fixedly connected to a monoanthracene oil receiving tank (10), and the left end of the monoanthracene oil receiving tank (10) is fixedly connected to a first vacuum pump (11).

3. The stripping and vacuum distillation series production unit for modified coal tar pitch according to claim 1, wherein: The second regulating assembly includes a second heat exchanger (17), the left end of the second heat exchanger (17) is fixedly connected to the other end of the third gas-phase extraction outlet (16), the front end of the second heat exchanger (17) is fixedly connected to a dianthracene oil receiving tank (18), and the right end of the dianthracene oil receiving tank (18) is fixedly connected to a second vacuum pump (19).

4. The apparatus for producing modified coal tar pitch by series connection of steam stripping and vacuum distillation according to claim 1, wherein: The other end of the first material outlet (7) is fixedly connected to the front end of the tubular heating furnace (2) through a pumping pump, and the other end of the third material outlet (15) is fixedly connected to the front end of the vacuum flash distillation column (4) through another pumping pump.

5. The stripping and vacuum distillation series production unit for modified coal tar pitch according to claim 1, characterized in that: The bottom of the vacuum distillation column (1) is fixedly connected to a bottom plate (21).

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