An online oil heating method for a catalytic slurry carbon black production line

Abstract

The present invention discloses an on-line oil heating method for a catalytic slurry carbon black production line, which comprises the following steps: 1) Using a first three-way regulating valve to divert the flue gas of the carbon black production line to a first heat exchanger and a second heat exchanger. The first heat exchanger is used to heat the heat transfer oil, and the second heat exchanger is used to heat the oil slurry after filtering the catalyst; 2) Diverting the flue gas outlet of the first heat exchanger by using a second three-way regulating valve, and part of the flue gas is refluxed to the flue gas pipeline between the first three-way regulating valve and the second heat exchanger. Diverting the flue gas outlet of the first heat exchanger by using a third three-way regulating valve, and part of the flue gas is refluxed to the flue gas pipeline between the first three-way regulating valve and the first heat exchanger; 3) Forming a heat transfer oil circulation between the heat transfer oil in the first heat exchanger and a third heat exchanger. The third heat exchanger is used to heat the catalytic oil slurry in front of the first filter. This heating method can effectively avoid local overheating and coking of the catalytic oil slurry.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalytic slurry reprocessing equipment, and specifically relates to an online oil heating method for a catalytic slurry carbon black production line. Background Art

[0002] In petroleum refining production, catalytic cracking is the main means of producing light oil products. The catalytic cracking reaction will produce catalytic slurry, that is, oil slurry containing catalysts. These oil slurries are often initially sold at a low price as waste oil or burned as fuel, with low utilization rate and declining benefits.

[0003] In the prior art, in order to increase the added value of products, these catalytic slurries are used to produce carbon black, so as to increase the added value of products and economic benefits. To produce carbon black from catalytic slurry, first, a first filter is used to remove solid catalysts in the catalytic slurry, and then it is heated to 330 - 360 °C and fed into a distillation column for distillation. After distillation, the oil for carbon black production and other products are separated, and then the oil for carbon black production is used for carbon black production. Since the catalytic slurry itself has a high viscosity, it is difficult to filter solid catalysts in the first filter at low temperatures. Therefore, it is generally heated to improve its fluidity and then filtered.

[0004] During the production process of carbon black, flue gas at about 600 °C will be discharged. Naturally, the flue gas generated during the carbon black production process is used to heat the catalytic slurry to about 360 °C through a heat exchanger, and the heated catalytic slurry is fed into the first filter to filter out the catalyst. The filtered slurry at 330 - 360 °C is directly fed into the distillation column for distillation, so as to effectively utilize the heat of the flue gas and save energy.

[0005] However, in the actual processing process, due to the unstable temperature of the flue gas, which will fluctuate within a certain range, it is easy to cause local overheating, resulting in the catalytic slurry in the heat exchanger being easily coked due to local overheating. It is easy to cause blockage or too small flow rate in the heat exchanger and the first filter, and frequent coke cleaning is required, seriously affecting production efficiency. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides an online oil heating method for a catalytic slurry carbon black production line, which can effectively avoid the problem of coking caused by local overheating of the catalytic slurry during the heat exchange process due to unstable flue gas temperature.

[0007] To solve the above technical problems, the present invention is solved by the following technical solutions: An online oil heating method for a catalytic slurry carbon black production line, comprising the following steps: 1) Using a first three-way regulating valve to divert the flue gas of the carbon black production line to a first heat exchanger and a second heat exchanger. The first heat exchanger is used to heat the heat transfer oil, and the second heat exchanger is used to heat the slurry after filtering the catalyst; 2) The flue gas outlet of the first heat exchanger is diverted by a second three-way regulating valve. Part of the flue gas is refluxed to the flue gas pipeline between the first three-way regulating valve and the second heat exchanger. According to the flue gas temperature, the second three-way regulating valve is adjusted online to regulate the flue gas temperature entering the second heat exchanger. The flue gas outlet of the first heat exchanger is diverted by a third three-way regulating valve. Part of the flue gas is refluxed to the flue gas pipeline between the first three-way regulating valve and the first heat exchanger. According to the flue gas temperature, the third three-way regulating valve is adjusted online to regulate the flue gas temperature entering the first heat exchanger; 3) The heat transfer oil in the first heat exchanger forms a heat transfer oil cycle with a third heat exchanger. The third heat exchanger is used to heat the catalytic slurry in front of the first filter. In this online oil heating method for the catalytic slurry carbon black production line, the flue gas of the carbon black production line is diverted. One part is used to heat the heat transfer oil, and the other part is used to heat the slurry after filtering the catalyst. The catalytic slurry is heated by the heat transfer oil to improve its fluidity so that solid catalysts can be filtered out by the filter. Since the heat transfer oil has good thermal stability and heat transfer performance during heat exchange, the situation of local overheating and coking of the catalytic slurry is effectively avoided. According to the flue gas temperatures of the flue gas of the carbon black production line and the flue gas discharged from the first heat exchanger, the online flow regulation of the second three-way regulating valve and the third three-way regulating valve is used to respectively control the amount of the flue gas mixed into the flue gas pipeline between the first three-way regulating valve and the second heat exchanger and the flue gas pipeline between the first three-way regulating valve and the first heat exchanger. The amount of the flue gas that has been cooled by heat exchange in the first heat exchanger is mixed in, so as to stably control the flue gas temperatures entering the first heat exchanger and the second heat exchanger. Specifically, when the flue gas temperature of the carbon black production line decreases, the amount of the flue gas discharged from the first heat exchanger mixed in is reduced. When the flue gas temperature of the carbon black production line increases, the amount of the flue gas discharged from the first heat exchanger mixed in is increased. Furthermore, the problem of coking of the slurry during heat exchange between the flue gas and the filtered slurry is effectively avoided. Since the heat transfer oil generally has problems such as oxidation, cracking, and carbon deposition at temperatures exceeding 300 °C, the catalytic slurry cannot be heated to 330 - 360 °C required for subsequent rectification at one time. In the present invention, the heat transfer oil is first heated, and the catalytic slurry is heated by the heat transfer oil. Then, the flue gas after the heat transfer oil is cooled is used to adjust and stabilize the flue gas for heating the heat transfer oil and the flue gas for heating the filtered slurry. The flue gas for heating the filtered slurry continues to heat the catalytic slurry to 330 - 360 °C required for subsequent rectification, thereby avoiding the problem of local overheating and coking of the catalytic slurry during the heat exchange process due to unstable flue gas temperature.

[0008] In the above technical solution, preferably, it includes the steps of: 4) The flue gas discharged from the second heat exchanger and another part of the flue gas discharged from the second three-way regulating valve are used to preheat the catalytic slurry in the catalytic slurry storage tank. By using the flue gas discharged from the second heat exchanger and another part of the flue gas discharged from the second three-way regulating valve to preheat the catalytic slurry in the catalytic slurry storage tank, the temperature of the catalytic slurry in the catalytic slurry storage tank is increased, its fluidity is improved, and the energy of the transfer pump is saved.

[0009] In the above technical solution, preferably, the third heat exchanger heats the catalytic slurry to 270 - 280 °C, and the second heat exchanger heats the slurry to 330 - 360 °C. Since heat transfer oil generally has problems such as oxidation, cracking, and carbon deposition when the temperature exceeds 300 °C, the third heat exchanger heats the catalytic slurry to 270 - 280 °C, and the second heat exchanger heats the slurry to 330 - 360 °C so that the slurry can be directly introduced into the distillation kettle for reaction.

[0010] In the above technical solution, preferably, a heating jacket is provided in the catalytic slurry storage tank, and the flue gas discharged from the second heat exchanger and another part of the flue gas discharged from the second three-way regulating valve pass through the heating jacket to preheat the catalytic slurry in the catalytic slurry storage tank.

[0011] In the above technical solution, preferably, the flue gas after passing through the catalytic slurry storage tank is discharged after waste heat recovery and tail gas treatment.

[0012] In the above technical solution, preferably, the catalytic slurry storage tank is connected to the first filter through the third heat exchanger, the outlet of the first filter is connected to the distillation column through the second heat exchanger, the outlet of the first filter is also connected to a backflush slurry storage tank, the backflush slurry storage tank is connected to the backflush port of the first filter, the drain port of the first filter is connected to a sewage storage tank, and the sewage storage tank and the backflush slurry storage tank are connected through a second filter. When performing backwashing, the inlet and outlet of the first filter are closed, the slurry in the backflush slurry storage tank is introduced into the backflush port, and the filter residue is discharged together with the drain port to the sewage storage tank. The slurry containing filter residue in the sewage storage tank is filtered through the second filter and the slurry is returned to the backflush slurry storage tank. Using this connection method enables the slurry filtered by the first filter to be stored in the backflush slurry storage tank. When the first filter needs to be backwashed, the slurry in the backflush slurry storage tank is introduced into the backflush port, and the filter residue is discharged together with the drain port to the sewage storage tank. The slurry containing filter residue in the sewage storage tank is filtered through the second filter and the slurry is returned to the backflush slurry storage tank, making the flushing of the first filter more convenient, and the flushing oil can be reused. Removing the second filter to remove the filter residue does not affect the use of the first filter.

[0013] In the above technical solution, preferably, a heating jacket is provided inside the backwash slurry storage tank, and the flue gas discharged from the second heat exchanger or another part of the flue gas discharged from the second three-way regulating valve passes through the heating jacket to keep the slurry in the backwash slurry storage tank warm. Passing the flue gas through the backwash slurry storage tank can keep the slurry in the backwash slurry storage tank warm, making it have better fluidity, so that heating the slurry is no longer required during the flushing operation.

[0014] In the above technical solution, preferably, a heat transfer oil heating device is provided on the heat transfer oil circulation. By setting the heat transfer oil heating device, auxiliary heating can be carried out when the temperature of the flue gas is not enough to heat the heat transfer oil to the set temperature, so as to stabilize the heat transfer oil to the set temperature.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In this online oil heating method for a catalytic slurry carbon black production line, the flue gas of the carbon black production line is shunted, one part is used to heat the heat transfer oil, and the other part is used to heat the slurry after filtering the catalyst. The heat transfer oil is used to heat the catalytic slurry to improve its fluidity so that solid catalyst can be filtered out by the filter. Since the heat transfer oil has good thermal stability and heat transfer performance during heat exchange, the situation of local overheating and coking of the catalytic slurry is effectively avoided. According to the flue gas temperature, the first three-way regulating valve is adjusted online to regulate the flue gas flow rate entering the first heat exchanger to stabilize the heat transfer oil temperature, that is, when the flue gas temperature decreases, the flue gas flow rate entering the first heat exchanger is increased, and when the flue gas temperature increases, the flue gas flow rate entering the first heat exchanger is decreased, so as to stabilize the heat transfer oil temperature. However, since the heat transfer oil generally has problems such as oxidation, cracking and carbon deposition when the temperature exceeds 300 °C, the catalytic slurry cannot be heated to 330-360 °C required for subsequent rectification at one time; further, part of the flue gas cooled by the first heat exchanger is re-circulated to the flue gas pipeline between the first three-way regulating valve and the second heat exchanger. According to the flue gas temperature, the second three-way regulating valve is adjusted online to regulate the flue gas temperature entering the second heat exchanger, that is, according to the flue gas temperature of the carbon black production line and the cooled flue gas temperature at the outlet of the first heat exchanger, by adjusting the second three-way regulating valve online, part of the cooled flue gas at the outlet of the first heat exchanger is mixed with the original flue gas between the first three-way regulating valve and the second heat exchanger, so that the flue gas temperature entering the second heat exchanger can always be stabilized, and further the problem of coking of the slurry when the flue gas exchanges heat with the filtered slurry is effectively avoided; by using the flue gas discharged from the second heat exchanger and another part of the flue gas discharged from the second three-way regulating valve to preheat the catalytic slurry in the catalytic slurry storage tank, the temperature of the catalytic slurry in the catalytic slurry storage tank is increased, its fluidity is improved, and the energy of the transfer pump is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow chart of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments: Refer to Figure 1 , Figure 1 which shows three flow paths of flue gas, heat transfer oil, and catalytic slurry. Among them, the solid line represents the flow path of the catalytic slurry, the uneven dashed line represents the flow path of the flue gas, and the uniform dashed line represents the flow path of the heat transfer oil circulation.

[0018] An online oil heating method for a catalytic slurry carbon black production line, comprising the following steps: 1) Using a first three-way regulating valve 1 to divert the flue gas of the carbon black production line to a first heat exchanger 2 and a second heat exchanger 3. The first heat exchanger 2 is used to heat the heat-conducting oil, and the second heat exchanger 3 is used to heat the slurry after filtering the catalyst; 2) The flue gas outlet of the first heat exchanger 2 is diverted by a second three-way regulating valve 4. Part of the flue gas is returned to the flue gas pipeline between the first three-way regulating valve 1 and the second heat exchanger 3. According to the flue gas temperature, the second three-way regulating valve 4 is adjusted online to regulate the flue gas temperature entering the second heat exchanger 3. The flue gas outlet of the first heat exchanger 2 is diverted by a third three-way regulating valve 5. Part of the flue gas is returned to the flue gas pipeline between the first three-way regulating valve 1 and the first heat exchanger 2. According to the flue gas temperature, the third three-way regulating valve 5 is adjusted online to regulate the flue gas temperature entering the first heat exchanger 2; 3) The heat-conducting oil in the first heat exchanger 2 forms a heat-conducting oil circulation with a third heat exchanger 6. The third heat exchanger 6 is used to heat the catalytic slurry in front of the first filter. In this online oil heating method for the catalytic slurry carbon black production line, the flue gas of the carbon black production line is diverted. One part is used to heat the heat-conducting oil, and the other part is used to heat the slurry after filtering the catalyst. The catalytic slurry is heated by the heat-conducting oil to improve its fluidity so that the solid catalyst can be filtered out by the filter. Since the heat-conducting oil has good thermal stability and heat transfer performance during heat exchange, the situation of local overheating and coking of the catalytic slurry is effectively avoided. According to the flue gas temperatures of the carbon black production line and the flue gas discharged from the first heat exchanger 2, the online flow rate adjustment of the second three-way regulating valve 4 and the third three-way regulating valve 5 respectively controls the amount of flue gas mixed into the flue gas pipeline between the first three-way regulating valve 1 and the second heat exchanger 3 and the flue gas pipeline between the first three-way regulating valve 1 and the first heat exchanger 2, and the amount of the flue gas that has been heat-exchanged and cooled by the first heat exchanger 2. Thus, the flue gas temperatures entering the first heat exchanger 2 and the second heat exchanger 3 are stably controlled. Specifically, when the flue gas temperature of the carbon black production line decreases, the amount of the flue gas discharged from the first heat exchanger 2 mixed in is reduced. When the flue gas temperature of the carbon black production line increases, the amount of the flue gas discharged from the first heat exchanger 2 mixed in is increased. Furthermore, the problem of coking of the slurry during the heat exchange between the flue gas and the filtered slurry is effectively avoided. Since the heat-conducting oil generally has problems such as oxidation, cracking, and carbon deposition when the temperature exceeds 300 °C, the catalytic slurry cannot be heated to 330 - 360 °C required for subsequent rectification at one time. In the present invention, the heat-conducting oil is first heated, the catalytic slurry is heated by the heat-conducting oil, and then the flue gas after the heat-conducting oil is cooled is used to adjust and stabilize the flue gas for heating the heat-conducting oil and the flue gas for heating the filtered slurry. The flue gas for heating the filtered slurry continues to heat the catalytic slurry to 330 - 360 °C required for subsequent rectification, thereby avoiding the problem of local overheating and coking of the catalytic slurry during the heat exchange process due to unstable flue gas temperature.

[0019] In the flue gas pipeline, in order to detect the temperature of the internal flue gas, essential temperature sensors need to be installed. In order to control the flow direction of the flue gas, essential one-way valves need to be installed. In order to facilitate the control of the flue gas flow rate, a flow meter needs to be installed. The opening degrees of the first three-way regulating valve 1, the second three-way regulating valve 4, and the third three-way regulating valve 5 are calculated by the control device based on the sensed temperature of the temperature sensor. The first three-way regulating valve 1, the second three-way regulating valve 4, and the third three-way regulating valve 5 are preferably solenoid valves, and their opening degrees are controlled online by the control device, so as to stably control the temperature entering the first heat exchanger 2 and the second heat exchanger 3. Similarly, on the conveying line of the catalytic oil slurry, an essential conveying pump needs to be installed. The conveying pump is preferably a screw extrusion pump. On the conveying line of the catalytic oil slurry, in order to facilitate the control of its temperature, a temperature sensor also needs to be installed.

[0020] In order to reduce the viscosity of the catalytic oil slurry in the catalytic oil slurry storage tank 7 and facilitate its pumping, the method further includes the step: 4) The flue gas discharged from the second heat exchanger 3 and another part of the flue gas discharged from the second three-way regulating valve 4 are used to preheat the catalytic oil slurry in the catalytic oil slurry storage tank 7. By using the flue gas discharged from the second heat exchanger 3 and another part of the flue gas discharged from the second three-way regulating valve 4 to preheat the catalytic oil slurry in the catalytic oil slurry storage tank 7, the temperature of the catalytic oil slurry in the catalytic oil slurry storage tank 7 is increased, its fluidity is improved, and the energy of the conveying pump is saved.

[0021] In this embodiment, the third heat exchanger 6 heats the catalytic oil slurry to 270 - 280 °C, and the second heat exchanger 3 heats the oil slurry to 330 - 360 °C. Since the heat transfer oil generally oxidizes, cracks, and forms carbon deposits due to excessive temperature when it exceeds 300 °C, and the better-quality heat transfer oil can work at about 330 °C at most. In order to avoid problems such as oxidation, cracking, and carbon deposition caused by too high a temperature of the heat transfer oil, the third heat exchanger 6 heats the catalytic oil slurry to 270 - 280 °C, and the second heat exchanger 3 heats the oil slurry to 330 - 360 °C so that the oil slurry can be directly introduced into the distillation kettle for reaction.

[0022] In this embodiment, in order to conveniently preheat the catalytic oil slurry in the catalytic oil slurry storage tank 7, a heating jacket is provided in the catalytic oil slurry storage tank 7. The flue gas discharged from the second heat exchanger 3 and another part of the flue gas discharged from the second three-way regulating valve 4 pass through the heating jacket to preheat the catalytic oil slurry in the catalytic oil slurry storage tank 7.

[0023] In this embodiment, in order to further utilize the waste heat in the flue gas and avoid environmental pollution, the flue gas after passing through the catalytic oil slurry storage tank 7 is discharged after waste heat recovery and tail gas treatment.

[0024] In this embodiment, the catalytic slurry storage tank 7 is connected to the first filter 8 through the third heat exchanger 6. The outlet of the first filter 8 is connected to the distillation column through the second heat exchanger 3. The outlet of the first filter 8 is also connected to the backflush slurry storage tank 9. The backflush slurry storage tank 9 is connected to the backflush port of the first filter 8. The drain port of the first filter 8 is connected to the sewage storage tank 10. The sewage storage tank 10 and the backflush slurry storage tank 9 are communicated through the second filter 11. When performing backflushing, the inlet and outlet oil ports of the first filter 8 are closed, and the slurry in the backflush slurry storage tank 9 is introduced into the backflush port, and the slurry and filter residue are discharged together through the drain port to the sewage storage tank 10. The slurry containing filter residue in the sewage storage tank 10 is filtered by the second filter 11 and the slurry is refluxed to the backflush slurry storage tank 9. Using this connection method enables the slurry filtered by the first filter 8 to enter the backflush slurry storage tank 9 for storage. When the first filter 8 needs to be backflushed, the slurry in the backflush slurry storage tank 9 is introduced into the backflush port, and the slurry and filter residue are discharged together through the drain port to the sewage storage tank 10. The slurry containing filter residue in the sewage storage tank 10 is filtered by the second filter 11 and the slurry is refluxed to the backflush slurry storage tank 9, making the flushing of the first filter 8 more convenient, and the flushing oil can be reused, and the use of the first filter 8 is not affected when the second filter 11 is disassembled to remove the filter residue. It is easy for those skilled in the art to understand that in order to implement the above operation process, a number of valves need to be provided on the connecting pipes between the first filter 8, the backflush slurry storage tank 9, the sewage storage tank 10 and the second filter 11.

[0025] In this embodiment, a heating jacket is provided in the backflush slurry storage tank 9. The flue gas discharged from the second heat exchanger 3 or another part of the flue gas discharged from the second three-way regulating valve 4 passes through the heating jacket to keep the slurry in the backflush slurry storage tank 9 warm. Passing the flue gas through the backflush slurry storage tank 9 can keep the slurry in the backflush slurry storage tank 9 warm, making it keep better fluidity, so that the flushing operation does not need to heat the slurry again.

[0026] In this embodiment, a heat transfer oil heating device 12 is provided on the heat transfer oil circulation. By setting the heat transfer oil heating device 12, auxiliary heating can be carried out when the flue gas temperature is not enough to heat the heat transfer oil to the set temperature, so as to stabilize the heat transfer oil to the set temperature. The heat transfer oil heating device 12 is preferably an electric heating heat transfer oil heater, which can more accurately control the temperature of the heat transfer oil.

[0027] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An online oil heating method for a catalytic oil slurry carbon black production line, characterized in that: The following steps are involved: 1) The flue gas of the carbon black production line is diverted to the first heat exchanger (2) and the second heat exchanger (3) by using a first three-way regulating valve (1); the first heat exchanger (2) is used to heat the heat transfer oil, and the second heat exchanger (3) is used to heat the oil slurry after filtering the catalyst; 2) The flue gas outlet of the first heat exchanger (2) is diverted by using a second three-way regulating valve (4); part of the flue gas flows back to the flue gas pipeline between the first three-way regulating valve (1) and the second heat exchanger (3); the second three-way regulating valve (4) is adjusted online according to the flue gas temperature to adjust the flue gas temperature entering the second heat exchanger (3); the flue gas outlet of the first heat exchanger (2) is diverted by using a second three-way regulating valve (4); part of the flue gas flows back to the flue gas pipeline between the first three-way regulating valve (1) and the second heat exchanger (3); the flue gas temperature entering the second heat exchanger (3) is adjusted by adjusting the second three-way regulating valve (4) online according to the flue gas temperature; The third three-way regulating valve (5) is used to divert part of the flue gas and return part of the flue gas to the flue gas duct between the first three-way regulating valve (1) and the first heat exchanger (2). The third three-way regulating valve (5) is adjusted online according to the flue gas temperature to adjust the temperature of the flue gas entering the first heat exchanger (2); 3) the heat transfer oil in the first heat exchanger (2) and the third heat exchanger (6) form a heat transfer oil circulation. The third heat exchanger (6) is used to heat the catalytic oil slurry on the front side of the first filter (8). The third heat exchanger (6) heats the catalytic oil slurry to 270-280°C, and the second heat exchanger (3) heats the oil slurry to 330-360°C.

2. The method for online oil heating of a catalytic slurry carbon black production line according to claim 1, characterized in that: The method comprises the following steps: 4) the flue gas discharged from the second heat exchanger (3) and another part of the flue gas discharged from the second three-way regulating valve (4) are used to preheat the catalytic oil slurry in the catalytic oil slurry storage tank (7).

3. The method for online oil heating of a catalytic slurry carbon black production line according to claim 2, characterized in that: The catalytic oil slurry storage tank (7) is provided with a heating jacket, and the flue gas discharged from the second heat exchanger (3) and another part of the flue gas discharged from the second three-way regulating valve (4) pass through the heating jacket to preheat the catalytic oil slurry in the catalytic oil slurry storage tank (7).

4. The method for online oil heating of a catalytic slurry carbon black production line according to claim 3, characterized in that: The flue gas after passing through the catalytic oil slurry storage tank (7) is discharged after waste heat recovery and tail gas treatment.

5. The method for online oil heating of a catalytic slurry carbon black production line according to claim 1, characterized in that: The catalytic oil slurry storage tank (7) is connected to the first filter (8) via the third heat exchanger (6); the outlet of the first filter (8) is connected to the distillation tower via the second heat exchanger (3); the outlet of the first filter (8) is also connected to a backwash oil slurry storage tank (9); the backwash oil slurry storage tank (9) is connected to the backwash port of the first filter (8); the sewage outlet of the first filter (8) is connected to a sewage storage tank (10); the sewage storage tank (10) and the backwash oil slurry storage tank (9) are connected via the second filter (11); when backwashing is performed, the oil inlet and outlet of the first filter (8) are closed, the oil slurry in the backwash oil slurry storage tank (9) is passed into the backwash port, and is discharged together with the filter residue into the sewage storage tank (10) through the sewage outlet; the oil slurry containing the filter residue in the sewage storage tank (10) is filtered by the second filter (11) and the oil slurry is returned to the backwash oil slurry storage tank (9).

6. The method for online oil heating of a catalytic slurry carbon black production line according to claim 5, characterized in that: A heating jacket is provided in the backwash oil slurry storage tank (9), and the flue gas discharged from the second heat exchanger (3) or another part of the flue gas discharged from the second three-way regulating valve (4) passes through the heating jacket to keep the oil slurry in the backwash oil slurry storage tank (9) warm.

7. The method for online oil heating of a catalytic slurry carbon black production line according to claim 1, characterized in that: The heat transfer oil circulation is provided with a heat transfer oil heating device (12).

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