CN216039433U - Mesophase pitch raw materials pretreatment systems - Google Patents
Mesophase pitch raw materials pretreatment systems Download PDFInfo
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- CN216039433U CN216039433U CN202121727772.7U CN202121727772U CN216039433U CN 216039433 U CN216039433 U CN 216039433U CN 202121727772 U CN202121727772 U CN 202121727772U CN 216039433 U CN216039433 U CN 216039433U
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- 239000002994 raw material Substances 0.000 title claims abstract description 29
- 239000011302 mesophase pitch Substances 0.000 title claims description 18
- 239000002002 slurry Substances 0.000 claims abstract description 199
- 239000010426 asphalt Substances 0.000 claims abstract description 123
- 238000000926 separation method Methods 0.000 claims abstract description 81
- 238000003860 storage Methods 0.000 claims abstract description 42
- 238000004821 distillation Methods 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 238000011010 flushing procedure Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 15
- 238000007711 solidification Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
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- 239000007787 solid Substances 0.000 description 18
- 239000011295 pitch Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 229920000049 Carbon (fiber) Polymers 0.000 description 11
- 239000004917 carbon fiber Substances 0.000 description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000012071 phase Substances 0.000 description 10
- 238000005292 vacuum distillation Methods 0.000 description 10
- 238000011001 backwashing Methods 0.000 description 8
- 239000006228 supernatant Substances 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 229910021645 metal ion Inorganic materials 0.000 description 7
- 230000005684 electric field Effects 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000004005 microsphere Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
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- 238000004517 catalytic hydrocracking Methods 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
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- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- -1 cyclic aromatic hydrocarbons Chemical class 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000010762 marine fuel oil Substances 0.000 description 1
- 239000011331 needle coke Substances 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
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Abstract
The utility model discloses an intermediate phase asphalt raw material pretreatment system, which comprises an oil slurry storage tank, wherein a first outlet at the lower part of the oil slurry storage tank is connected with an external throwing oil slurry discharging pipe, the external throwing oil slurry discharging pipe is connected with an oil slurry pipe pass inlet of an oil slurry-asphalt heat exchanger, an oil slurry pipe pass outlet of the oil slurry-asphalt heat exchanger is connected with an oil slurry inlet of an oil slurry electrostatic separation device, a clarified oil outlet of the oil slurry electrostatic separation device is connected with a clarified oil inlet of a reduced pressure distillation tower, and a tower bottom asphalt outlet at the bottom of the reduced pressure distillation tower is connected with an asphalt shell pass inlet of the oil slurry electrostatic separation device through an asphalt pipe; and an asphalt shell pass outlet of the oil slurry electrostatic separation device is connected with an asphalt inlet of the asphalt electrostatic separation device. The method fully utilizes the high-temperature asphalt at the bottom of the pressure reduction tower as the heat medium to heat the raw material oil slurry to the separation temperature of primary de-solidification, simultaneously reduces the temperature of the asphalt at the bottom of the tower to the separation temperature of secondary de-solidification, cancels a heater for heating the raw material of the oil slurry by other heat mediums, and is beneficial to saving energy and reducing consumption of the device.
Description
Technical Field
The utility model relates to the field of petrochemical industry, in particular to a mesophase pitch raw material pretreatment system.
Background
The high-performance asphalt-based carbon fiber is a novel material with high strength, high toughness, heat resistance, wear resistance, corrosion resistance and radiation resistance, and is widely applied to the fields of aerospace, war industry, medical treatment, cultural and sports goods and the like. Meanwhile, pitch-based carbon fibers are receiving attention due to the characteristics of low price, high strength, high modulus and the like. At present, the United states and Japan achieve better results in the development of the pitch-based carbon fiber, and China also greatly promotes the industrial development and application of the technology and achieves more favorable results. The defects in the carbon fiber process are inherited, so that the quality of the mesophase pitch determines the performance of the final carbon fiber to the maximum extent.
The oil slurry at the bottom of the catalytic cracking fractionating tower, the oil slurry at the bottom of the coking fractionating tower, the oil slurry at the bottom of the hydrocracking fractionating tower and the like contain a large amount of 2-4 cyclic aromatic hydrocarbons, and the boiling point of the oil slurry is mainly concentrated in the fraction of 300-500 ℃. According to the theory that the intermediate phase is generated by liquid phase carbonization and deduced from the intermolecular interaction energy, the oil slurry system has larger aromaticity, the temperature interval for maintaining the plasticity of the intermediate phase is wider, and the anisotropic easily graphitized microstructure is easy to obtain.
Therefore, these slurries are one of the superior raw materials for preparing carbon fiber materials. However, these slurries contain high ash content and carry high light components, which seriously affect the quality of mesophase pitch and ultimately make it difficult to produce high quality carbon fiber materials.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a mesophase pitch raw material pretreatment system.
In order to achieve the purpose, the intermediate phase asphalt raw material pretreatment system comprises an oil slurry storage tank, wherein a feed inlet at the upper part of the oil slurry storage tank is connected with an external throwing oil slurry inlet pipe of an oil refinery, a first outlet at the lower part of the oil slurry storage tank is connected with an external throwing oil slurry discharge pipe, the external throwing oil slurry discharge pipe is connected with an oil slurry pipe pass inlet of an oil slurry-asphalt heat exchanger, an oil slurry pipe pass outlet of the oil slurry-asphalt heat exchanger is connected with an oil slurry inlet of an oil slurry electrostatic separation device, a clarified oil outlet of the oil slurry electrostatic separation device is connected with a clarified oil inlet of a reduced pressure distillation tower, and a tower bottom asphalt outlet at the bottom of the reduced pressure distillation tower is connected with an asphalt shell pass inlet of the oil slurry electrostatic separation device through an asphalt pipe; an asphalt shell pass outlet of the oil slurry electrostatic separation device is connected with an asphalt inlet of the asphalt electrostatic separation device, and a discharge pipe is arranged at an intermediate phase asphalt raw material outlet of the asphalt electrostatic separation device.
Furthermore, an oil slurry tube pass outlet of the oil slurry-asphalt heat exchanger is respectively connected with a back-flushing oil slurry inlet of the oil slurry electrostatic separation device and a back-flushing oil slurry inlet of the asphalt electrostatic separation device;
and a back-flushing oil slurry outlet of the oil slurry electrostatic separation device and a back-flushing oil slurry outlet of the asphalt electrostatic separation device are respectively connected with a first inlet and a second inlet at the upper part of the secondary oil slurry storage tank.
Furthermore, a clear liquid outlet in the middle of the secondary oil slurry storage tank is connected with a return port in the upper part of the oil slurry storage tank through a clear liquid descending pipe; and an asphalt mixing material discharging pipe is arranged at a second outlet at the lower part of the second-stage oil slurry storage tank.
Still further, the top of the vacuum distillation tower is connected with a vacuum tube, the side wall of the vacuum distillation tower is sequentially provided with a tower top light oil pipe and a middle section clarifying oil pipe from top to bottom, the tower top light oil pipe is provided with a return pipe, and the other end of the return pipe is connected with the vacuum distillation tower.
Furthermore, an oil slurry raw material pump is arranged on the external throwing oil slurry discharging pipe; and an asphalt pump is arranged on the asphalt pipe.
And furthermore, the clear liquid descending pipe and the asphalt blending material discharging pipe are both provided with a lifting pump.
And furthermore, exhaust pipes are arranged at the top of the oil slurry storage tank and the top of the secondary oil slurry storage tank.
The process of the mesophase pitch raw material pretreatment system comprises the following steps:
1) the oil slurry thrown out of the oil refinery enters an oil slurry storage tank through an oil slurry thrown out inlet pipe and is stored; the oil slurry thrown out of the oil refinery enters the oil slurry-asphalt heat exchanger 2 through the oil slurry throwing-out pipe to carry out heat exchange to ensure that the temperature reaches 160-220 ℃;
2) oil slurry thrown from outside of the oil refinery at the temperature of 160-220 ℃ enters an oil slurry electrostatic separation device, and fillers (the fillers are various non-conductive sintered microspheres such as glass microspheres and ceramic microspheres) in the oil slurry electrostatic separation device adsorb metal ions, active catalysts and ash impurities thereof under the action of a high-voltage gradient electric field; obtaining clarified oil with the solid content of 100-500 ppm;
3) the pitch after the clear oil enters a vacuum distillation tower and the light oil and the middle oil are fractionated by vacuum enters an oil slurry-pitch heat exchanger from a pitch outlet at the bottom of the vacuum distillation tower through a pitch pipe, is subjected to heat exchange with oil slurry thrown out of an oil refinery to reduce the temperature to 240 ℃, then enters an asphalt electrostatic separation device, and a filler in the asphalt electrostatic separation device (as above) adsorbs metal ions, active catalysts and ash impurities thereof remained in the asphalt under the action of a high-voltage gradient electric field to obtain the clear asphalt (the solid content is lower than 10ppm and the metal content is lower than 1ppm), and finally is sent to an intermediate phase asphalt processing unit through a discharge pipe.
Further, the cleaning process of the oil slurry electrostatic separation device comprises the following steps:
when the oil slurry electrostatic separation device is saturated in adsorption, the pressure regulator of the oil slurry electrostatic separation device is automatically powered off, metal ions, active catalyst fine powder and impurities/ash attached to the filler automatically fall off, and the oil slurry electrostatic separation device is at the temperature of 200-240 ℃, the pressure of 0.3-0.8MPa (gauge pressure, namely G) and the flow of 10-20m3Under the condition of/h, oil slurry thrown out of the oil refinery at the temperature of 160-220 ℃ enters the oil slurry electrostatic separation device from a back washing oil slurry inlet of the oil slurry electrostatic separation device to start back washing, and the oil slurry electrostatic separation device automatically enters a waiting or separating state after the back washing is qualified;
the back-washing slurry flows out from a back-washing slurry outlet of the electrostatic slurry separator and enters a secondary slurry storage tank, and after natural or chemical sedimentation, the thick slurry at the bottom layer is taken as an asphalt mixing material and leaves the factory through an asphalt mixing material discharge pipe; the supernatant liquid returns to the oil slurry storage tank through a supernatant liquid reducing pipe.
Still further, the cleaning process of the electrostatic asphalt separation device comprises the following steps:
when the asphalt electrostatic separation device is saturated in adsorption, the pressure device of the asphalt electrostatic separation device is automatically powered off, metal ions, active catalyst fine powder and impurities/ash attached on the filler automatically fall off, and the asphalt electrostatic separation device is at the temperature of 200-3Under the condition of/h, oil slurry thrown out of the oil refinery with the temperature of 160-
The back-flushing slurry flows out of a back-flushing slurry outlet of the asphalt electrostatic separation device and enters a secondary slurry storage tank, and after natural or chemical sedimentation, the thick slurry at the bottom layer is taken as an asphalt mixing material and leaves the factory through an asphalt mixing material discharge pipe; the supernatant liquid returns to the oil slurry storage tank through a supernatant liquid reducing pipe.
The functions of the components of the utility model are as follows:
1. the oil slurry electrostatic separation device utilizes a high-gradient electric field filler separation principle, can effectively treat oil slurry for de-solidification, the back-washed concentrated oil slurry is used as an asphalt blending material, the oil slurry after de-solidification enters a vacuum tower for distillation treatment, the physical filler adsorption technology can effectively treat oil slurry for de-solidification without introducing other secondary pollutants, the solid content of clarified oil obtained after removing oil slurry with solid content of thousands to ten thousands of ppm and through external throwing is only 100-500ppm, and the problem of equipment and pipeline blockage caused by overhigh solid content of asphalt at the bottom of a subsequent vacuum distillation tower is effectively solved.
2. The vacuum distillation tower effectively separates the bottom slurry oil which is simply fractionated by the catalytic, coking or hydrocracking atmospheric fractionating tower in the oil refinery in the slurry clarified oil by using the vacuum distillation technology, and the bottom slurry oil contains more light components, which are not beneficial to the subsequent processing treatment of high-quality mesophase pitch.
3. The electrostatic asphalt separator utilizes the high gradient electric field filler separation principle, can effectively solve the problem of de-solidification of asphalt (the solid content is hundreds to thousands of ppm), the concentrated oil slurry (the raw oil slurry is used as a back flushing liquid) is used as an asphalt blending material after back flushing, the solid content of the asphalt after de-solidification is lower than 10ppm, the physical filler adsorption technology can effectively treat the de-solidification of the oil slurry, other secondary pollutants can not be introduced, and simultaneously, the maximum production of clarified asphalt provides possibility for the subsequent high-quality intermediate phase asphalt production.
The principle of the process of the utility model is as follows:
the process of the utility model pretreats the oil slurry (catalytic oil slurry, coking oil slurry, hydrocracking oil slurry and the like) thrown outside the oil refinery to obtain high-quality mesophase asphalt raw materials:
the method comprises the steps of removing solids of the externally thrown slurry oil through a first-stage slurry oil electrostatic separation system, entering a vacuum tower, carrying out reduced pressure distillation to separate light components, vacuumizing the tower top to remove non-condensable gas, treating the gas to reach the standard, discharging the gas, taking light oil at the tower top as blend oil of diesel oil, taking middle-stage oil as a raw material for producing needle coke and also as blend oil of marine fuel oil, exchanging heat between asphalt at the tower bottom and the slurry oil to recover partial heat, and removing solids of the cooled asphalt at the tower bottom through a second-stage asphalt electrostatic separation system to obtain a high-quality intermediate-phase asphalt raw material with ash content lower than 10ppm and low light component content.
The utility model has the beneficial effects that:
1. the process fully considers the reasonable utilization of energy, fully utilizes the high-temperature asphalt at the bottom of the decompression tower as a heat medium to heat the raw material oil slurry to the separation temperature of primary de-solidification, simultaneously reduces the temperature of the asphalt at the bottom of the tower to the separation temperature of secondary de-solidification, cancels a heater for heating the raw material of the oil slurry by other heat media, and is beneficial to energy conservation and consumption reduction of the device.
2. The utility model provides possibility for producing high-performance asphalt-based carbon fiber by deeply investigating the process for producing high-quality mesophase asphalt raw material by pretreating external throwing oil slurry for removing solid and light components in an oil refinery, and plays a positive role in clean, large-scale and industrialized popularization of the production of the high-performance asphalt-based carbon fiber.
3. The utility model ensures the safe and stable operation of the device and long-period operation: after the oil slurry is subjected to solid removal by the oil slurry electrostatic separation device, light components of clarified oil are removed through reduced pressure distillation, and asphalt at the tower bottom is further subjected to solid removal through the asphalt separator, so that the stability of a reduced pressure system is ensured, the solid removal capacity of the asphalt separator is reduced, the whole separation system is completed under the conditions of medium temperature and low pressure, and the safety, stability and long-period operation of the device are effectively ensured.
In conclusion, the process for producing the high-quality mesophase pitch raw material by the pretreatment of removing the solid and the light components of the oil refinery external throwing slurry is verified by a pilot plant, so that the solid content of the product is less than 10ppm, the total content of the metal in the product is less than 1ppm, and the light components in the pitch are effectively removed, thereby powerfully verifying the excellent effect of the method, providing possibility for producing the high-performance pitch-based carbon fiber and further providing possibility for producing the high-performance pitch-based carbon fiber.
Drawings
FIG. 1 is a schematic diagram of a mesophase pitch feedstock pretreatment system;
in the figure, an oil slurry storage tank 1, an external throwing oil slurry inlet pipe 1.1, an external throwing oil slurry outlet pipe 1.2, an oil slurry-asphalt heat exchanger 2, an oil slurry electrostatic separation device 3, a reduced pressure distillation tower 4, an asphalt pipe 5, an asphalt electrostatic separation device 6, a discharge pipe 7, a secondary oil slurry storage tank 8, a clear liquid descending pipe 9, an asphalt mixed material discharge pipe 10, a vacuum pumping pipe 11, a tower top light oil pipe 12, a middle section clear oil pipe 13, a return pipe 14, an oil slurry raw material pump 15, an asphalt pump 16, a lift pump 17 and an exhaust pipe 18.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
The intermediate phase asphalt raw material pretreatment system shown in fig. 1 comprises an oil slurry storage tank 1, wherein a feed inlet at the upper part of the oil slurry storage tank 1 is connected with an external throwing oil slurry inlet pipe 1.1 of an oil refinery, a first outlet at the lower part of the oil slurry storage tank 1 is connected with an external throwing oil slurry discharge pipe 1.2, and the top of the oil slurry storage tank 1 is provided with an exhaust pipe 18;
an oil slurry raw material pump 15 is arranged on the external throwing oil slurry discharging pipe 1.2; an external throwing oil slurry discharging pipe 1.2 is connected with an oil slurry pipe pass inlet of an oil slurry-asphalt heat exchanger 2, an oil slurry pipe pass outlet of the oil slurry-asphalt heat exchanger 2 is connected with an oil slurry inlet of an oil slurry electrostatic separation device 3, a clarified oil outlet of the oil slurry electrostatic separation device 3 is connected with a clarified oil inlet of a reduced pressure distillation tower 4, and a tower bottom asphalt outlet at the bottom of the reduced pressure distillation tower 4 is connected with an asphalt shell pass inlet of the oil slurry electrostatic separation device 3 through an asphalt pipe 5; an asphalt pump 16 is arranged on the asphalt pipe 5;
an asphalt shell pass outlet of the oil slurry electrostatic separation device 3 is connected with an asphalt inlet of an asphalt electrostatic separation device 6, and a discharge pipe 7 is arranged at an intermediate phase asphalt raw material outlet of the asphalt electrostatic separation device 6;
the outlet of the oil slurry tube pass of the oil slurry-asphalt heat exchanger 2 is also respectively connected with a back-flushing oil slurry inlet of the oil slurry electrostatic separation device 3 and a back-flushing oil slurry inlet of the asphalt electrostatic separation device 6;
a back-flushing oil slurry outlet of the oil slurry electrostatic separation device 3 and a back-flushing oil slurry outlet of the asphalt electrostatic separation device 6 are respectively connected with a first inlet and a second inlet at the upper part of the secondary oil slurry storage tank 8; the top of the secondary oil slurry storage tank 8 is provided with an exhaust pipe 18; a clear liquid outlet in the middle of the secondary oil slurry storage tank 8 is connected with a return port at the upper part of the oil slurry storage tank 1 through a clear liquid descending pipe 9; a second outlet at the lower part of the secondary oil slurry storage tank 8 is provided with an asphalt mixed material discharging pipe 10; the clear liquid dropping pipe 9 and the asphalt blending material discharging pipe 10 are both provided with a lift pump 17.
A vacuumizing pipe 11 is connected to the top of the reduced pressure distillation tower 4, a tower top light oil pipe 12 and a middle section clarifying oil pipe 13 are sequentially arranged on the side wall of the reduced pressure distillation tower 4 from top to bottom, a return pipe 14 is arranged on the tower top light oil pipe 12, and the other end of the return pipe 14 is connected with the reduced pressure distillation tower 4;
the oil slurry electrostatic separation device 3 is an existing product and at least comprises a separator, wherein the separator comprises an electrode, a filler and a pressure regulator; the high-voltage end of the electrode is arranged in the separator, and the arrangement direction of the high-voltage end of the electrode is consistent with the flowing direction of the slurry; the filler is distributed between the electrodes; the voltage regulator is arranged outside the separator, is connected with the electrode cable and is configured with high-voltage insulation at the contact part with the shell grounding electrode;
the electrostatic asphalt separator 6 is an existing product and at least comprises a separator, wherein the separator comprises an electrode, a filler and a pressure regulator; the high-voltage end of the electrode is arranged in the separator, and the arrangement direction of the high-voltage end of the electrode is consistent with the flowing direction of the slurry; the filler is distributed between the electrodes; the voltage regulator is arranged outside the separator, is connected with the electrode cable and is configured with high-voltage insulation at the contact part with the shell grounding electrode;
in the above electrostatic oil slurry separator 3 and electrostatic asphalt separator 6, the separator may comprise two, three or more modular separators. Preferably, when the number of modules of the separator is more than or equal to 2, the separator adopts a parallel mode. The number of separators can be determined by calculation based on the slurry flow rate and the properties of the slurry. Furthermore, the separator can be connected with a controller, the operation of the single-module separator or the operation of the multi-module separator can be switched, and the module automatic switching can realize continuous solid removal and clarified oil discharge. The multi-module separator adopting the filler high-gradient electric field separation technology can operate in a single module or multiple modules, and the flow in the separation process is continuous and stable. When the upstream and downstream devices or systems have problems, the multi-module separator can conveniently keep the running state of the separator device by adopting internal circulation running (namely, a clear oil pump is started, backwash oil is conveyed to the separator from a raw material tank by the pump and then returns to the raw material tank to realize internal circulation), and slurry in the separation module can be discharged completely and then cut out of the separator device to be treated in an emergency state or when a single module fails to be treated.
The electrode is a high-voltage electrode, and the filler is made of non-conductive materials, such as glass beads, ceramic microspheres, zeolite microspheres and the like. The voltage regulator is connected with the power supply, can control the automatic on and off of the power supply, and can also boost the 380V low-voltage power supply to a high-voltage power supply with different gears of 0.5-4.0 kV.
The process of the mesophase pitch raw material pretreatment system comprises the following steps:
1) the oil slurry thrown out of the oil refinery enters an oil slurry storage tank 1 for storage through an oil slurry thrown out inlet pipe 1.1; the oil slurry of the oil refinery enters the oil slurry-asphalt heat exchanger 2 through the oil slurry discharging pipe 1.2 to carry out heat exchange to ensure that the temperature reaches 160-;
2) oil slurry thrown from outside of the oil refinery at the temperature of 160-; obtaining clarified oil with the solid content of 100-500 ppm; wherein, the cleaning process of the oil slurry electrostatic separation device 3 is as follows:
when the oil slurry electrostatic separation device 3 is saturated in adsorption, the pressure regulator of the oil slurry electrostatic separation device 3 is automatically powered off, metal ions, active catalyst fine powder and impurities/ash attached to the filler automatically fall off, oil refinery external throwing oil slurry with the temperature of 160-220 ℃ enters the oil slurry electrostatic separation device 3 from a backwashing oil slurry inlet of the oil slurry electrostatic separation device 3 to start backwashing under the conditions that the temperature is 200-240 ℃, the pressure is 0.3-0.8MPa and the flow is 10-20m3/h, and the oil slurry electrostatic separation device 3 automatically switches to a waiting or separating state after the backwashing is qualified
The back-flushing slurry flows out from a back-flushing slurry outlet of the electrostatic slurry oil separation device 3 and enters a secondary slurry oil storage tank 8, and after natural or chemical sedimentation, the thick slurry at the bottom layer is taken as an asphalt mixing material and leaves the factory through an asphalt mixing material discharge pipe 10; the supernatant liquid returns to the oil slurry storage tank 1 through a supernatant liquid descending pipe 9;
3) the pitch after the clear oil enters a vacuum distillation tower 4 and the light oil and the middle oil are fractionated under reduced pressure enters an oil slurry-pitch heat exchanger 2 from a pitch outlet at the bottom of the vacuum distillation tower 4 through a pitch pipe 5 to carry out heat exchange with the oil slurry thrown out of the oil refinery and reduce the temperature to 240 ℃, and then enters an asphalt electrostatic separation device 6, and a filler (same as the above) in the asphalt electrostatic separation device 6 adsorbs metal ions, active catalysts and ash impurities thereof remained in the asphalt under the action of a high-voltage gradient electric field to obtain clear asphalt (the solid content is lower than 10ppm, and the metal content is lower than 1ppm), and finally the clear asphalt is sent to an intermediate phase asphalt processing unit through a discharge pipe 7; wherein, the cleaning process of the asphalt electrostatic separation device 6 is as follows:
when the asphalt electrostatic separation device 6 is saturated in adsorption, the asphalt is staticThe 6-pressure device of the electric separation device is automatically powered off, the metal ions, the active catalyst fine powder and the impurities/ash attached on the filler automatically fall off, and the temperature is 200-240 ℃, the pressure is 0.3-0.8MPa and the flow is 10-20m3Under the condition of/h, oil slurry thrown out of the oil refinery with the temperature of 160-
The back-flushing slurry flows out of a back-flushing slurry outlet of the asphalt electrostatic separation device 6 and enters a secondary slurry storage tank 8, and after natural or chemical sedimentation, the thick slurry at the bottom layer is taken as an asphalt mixing material and leaves the factory through an asphalt mixing material discharge pipe 10; the supernatant liquid returns to the oil slurry storage tank 1 through the supernatant liquid descending pipe 9.
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (7)
1. A mesophase pitch raw materials pretreatment systems which characterized in that: the device comprises an oil slurry storage tank (1), wherein a feed inlet at the upper part of the oil slurry storage tank (1) is connected with an external throwing oil slurry inlet pipe (1.1) of an oil refinery, a first outlet at the lower part of the oil slurry storage tank (1) is connected with an external throwing oil slurry discharge pipe (1.2), the external throwing oil slurry discharge pipe (1.2) is connected with an oil slurry pipe pass inlet of an oil slurry-asphalt heat exchanger (2), an oil slurry pipe pass outlet of the oil slurry-asphalt heat exchanger (2) is connected with an oil slurry inlet of an oil slurry electrostatic separation device (3), a clarified oil outlet of the oil slurry electrostatic separation device (3) is connected with a clarified oil inlet of a reduced pressure distillation tower (4), and a tower bottom asphalt outlet at the bottom of the reduced pressure distillation tower (4) is connected with an asphalt shell pass inlet of the oil slurry electrostatic separation device (3) through an asphalt pipe (5); an asphalt shell pass outlet of the oil slurry electrostatic separation device (3) is connected with an asphalt inlet of the asphalt electrostatic separation device (6), and a discharge pipe (7) is arranged at a mesophase asphalt raw material outlet of the asphalt electrostatic separation device (6).
2. The mesophase pitch feedstock pretreatment system of claim 1, wherein: the oil slurry tube pass outlet of the oil slurry-asphalt heat exchanger (2) is also respectively connected with a back-flushing oil slurry inlet of the oil slurry electrostatic separation device (3) and a back-flushing oil slurry inlet of the asphalt electrostatic separation device (6);
the back-flushing oil slurry outlet of the oil slurry electrostatic separation device (3) and the back-flushing oil slurry outlet of the asphalt electrostatic separation device (6) are respectively connected with the first inlet and the second inlet at the upper part of the secondary oil slurry storage tank (8).
3. The mesophase pitch feedstock pretreatment system of claim 2, wherein: a clear liquid outlet in the middle of the secondary oil slurry storage tank (8) is connected with a return port at the upper part of the oil slurry storage tank (1) through a clear liquid descending pipe (9); and an asphalt mixing material discharging pipe (10) is arranged at a second outlet at the lower part of the secondary oil slurry storage tank (8).
4. The mesophase pitch feedstock pretreatment system of claim 1, wherein: the vacuum tube (11) is connected with the top of the reduced pressure distillation tower (4), the tower top light oil tube (12) and the middle section clarifying oil tube (13) are sequentially arranged on the side wall of the reduced pressure distillation tower (4) from top to bottom, a return pipe (14) is arranged on the tower top light oil tube (12), and the other end of the return pipe (14) is connected with the reduced pressure distillation tower (4).
5. The mesophase pitch feedstock pretreatment system of claim 1, wherein: an oil slurry raw material pump (15) is arranged on the external throwing oil slurry discharging pipe (1.2); and an asphalt pump (16) is arranged on the asphalt pipe (5).
6. The mesophase pitch feedstock pretreatment system of claim 3, wherein: the clear liquid dropping pipe (9) and the asphalt mixing material discharging pipe (10) are both provided with a lifting pump (17).
7. The mesophase pitch feedstock pretreatment system of claim 3, wherein: and exhaust pipes (18) are arranged at the top of the oil slurry storage tank (1) and the top of the secondary oil slurry storage tank (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121727772.7U CN216039433U (en) | 2021-07-27 | 2021-07-27 | Mesophase pitch raw materials pretreatment systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121727772.7U CN216039433U (en) | 2021-07-27 | 2021-07-27 | Mesophase pitch raw materials pretreatment systems |
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Address after: 430081 No.10, zone B, South Urban Industrial Park, Gongren village, Qingshan District, Wuhan City, Hubei Province Patentee after: Wuhan Baohua New Materials Co.,Ltd. Country or region after: China Address before: 430081 No.10, zone B, South Urban Industrial Park, Gongren village, Qingshan District, Wuhan City, Hubei Province Patentee before: WUHAN BAOHUA PETROCHEMICAL NEW MATERIAL DEVELOPMENT Co.,Ltd. Country or region before: China |