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A method for cleaning the coke in the modified asphalt production system by using washing oil

A technology of modified asphalt and production system, which is applied in the field of coke, which can solve the problems of poor cohesion and coking of medium-temperature asphalt, failure of full-load operation of the device, low mechanical strength, etc., and achieve the effect of improving cleaning efficiency and good cleaning effect

Active Publication Date: 2021-05-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the beginning of the 20th century, most carbon product manufacturers in my country used ordinary medium-temperature pitch to produce carbon products. Due to the poor cohesiveness and coking property of medium-temperature pitch, the mechanical strength of the produced carbon products was low.
It takes 1-2 months to disassemble and clean the coke, and at least 3 times a year, which leads to the failure of the device to operate at full capacity and increases the production cost

Method used

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  • A method for cleaning the coke in the modified asphalt production system by using washing oil
  • A method for cleaning the coke in the modified asphalt production system by using washing oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The difference between the temperature of the reactor heater (detected by thermocouple) and the temperature measuring point inside the reactor reached 13°C. It was judged that the modified asphalt production system was coked and cleaning was started.

[0037] (1) Cool down the system to 130°C, inject 80 tons of washing oil, and start the cycle cleaning process. The sampling results are shown in Table 1:

[0038] Table 1 Density of washing oil, quinoline content detection index

[0039] Sampling time (h) Density (g / cm 3 )

[0040] After 20 hours, the changes of density and quinoline insoluble matter content are both less than 3%, and it is considered that the cleaning is over. After cleaning, the modified asphalt system will be overhauled once this year and run for 10 months throughout the year.

Embodiment 2

[0042] When the temperature difference between the inlet and outlet of the tube furnace reached 27°C, it was determined that the modified asphalt production system was coked and cleaning was started.

[0043] (1) Cool down the system to 120°C, inject 60 tons of washing oil, and start the cycle cleaning process. The sampling results are shown in Table 2:

[0044] Density of table 2 washing oil, quinoline content detection index

[0045] Sampling time (h) Density (g / cm 3 )

[0046] After 48 hours, the changes in density and quinoline-insoluble content are still higher than 3%, and the wash oil is saturated, and the wash oil containing coke is discharged into the raw material tank. Continue to use the continuous feeding method to enter 60 tons of washing oil, use nitrogen to purge for 10 hours, and discharge all washing oil into the raw material tank. After the cleaning, the modified asphalt system has been overhauled twice this year, and it has been in operation ...

Embodiment 3

[0048] When the valve opening remains unchanged, the asphalt flow rate decreases by 11%. It is judged that the modified asphalt production system is coked and cleaning is started.

[0049] (1) Cool down the system to 150°C, inject 70 tons of washing oil, and start the cycle cleaning process. The sampling results are shown in Table 3:

[0050] Density of table 3 wash oil, quinoline content detection index

[0051] Sampling time (h) Density (g / cm 3 )

[0052] After 24 hours, if the change of the density and quinoline insoluble content is less than 3%, it is considered that the cleaning is completed. After the cleaning, the modified asphalt system will be overhauled once this year, and it will run for 10 months throughout the year.

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Abstract

The invention relates to a method for cleaning coke in a modified asphalt production system by using washing oil. 1) judging whether the modified asphalt production system needs to be cleaned; The washing oil is fed from the medium-temperature asphalt pipeline, and the washing oil is washed according to the operation route of the medium-temperature asphalt; b The amount of washing oil invested in the entire modified asphalt production system is 40%-60% of the single-day processing capacity of the modified asphalt, and the cycle is cleaned for 24 hours ‑48h; cAfter washing for 48h, drain the washed oil with coke into the raw material tank. The advantages are: the method of the invention has good cleaning effect, shortens the time for judging whether cleaning is required and whether cleaning is completed, and improves cleaning efficiency.

Description

technical field [0001] The invention belongs to the field of coking, and in particular relates to a method for cleaning coke in a modified asphalt production system by using washing oil. Background technique [0002] Coal tar pitch is a product obtained by distillation of coal tar, accounting for 50%-55% of the overall yield of coal tar products. The downstream users of coal tar pitch are mainly the carbon industry, mainly electrolytic aluminum prebaked anode and electrode manufacturers, and are widely used as binders and impregnants. At the beginning of the 20th century, most carbon product manufacturers in my country used ordinary medium-temperature pitch to produce carbon products. Due to the poor cohesiveness and coking property of medium-temperature pitch, the mechanical strength of the produced carbon products was low. In recent years, with the maturity of the manufacturing process of large-scale closed reactors, domestic enterprises have introduced modified asphalt p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B9/032B08B9/093C10C3/02
CPCB08B9/0321B08B9/093C10C3/02
Inventor 张展张大奎姚君贾楠楠张馨予
Owner ANGANG STEEL CO LTD