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Advantages of secondary impregnation

Release time:2019-12-18 From: Zhengnai Industry in China

Advantages of secondary impregnation of impregnated graphite electrode

  • 1. Improve the yield of the graphitization process.
  • 2. Reduce the power consumption of the graphitization process.
  • 3. A large reduction in the decomposition gas of the asphalt discharged during the graphitization process, and improve the production environment.
  • 4. It is beneficial to increase the carbon residue rate of the asphalt and increase the density of the finished product.

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Technical difficulties in secondary roasting

The technical difficulty of the secondary baking is that when the impregnating electrode is heated to above 200 ° C, a part of the asphalt is thermally decomposed to generate a large amount of volatile matter, and the other part of the asphalt is liquid oozing out of the surface of the electrode and smashed onto the kiln car.

Make full use of combustibles in graphite electrode

The bitumen is in the form of a liquid helium to the kiln platform. These combustibles can be used as fuel without controlled combustion.Not only does it consume more energy, but it also leads to loss of control of the kiln mud, resulting in premature failure of the steel cylinder or protective cover, kiln body and theft.

Secondary roasting with the following three characteristics of the kiln

  • 1. The volatile matter discharged after the decomposition of the asphalt can be used as a heating material, and the number of replenishing fuels required is not much, thus greatly reducing fuel consumption.
  • 2. After the volatiles discharged from the decomposition of the asphalt are fully calcined, the harmful components are already few, and the environmental protection equipment for treating the exhaust gas can be simplified.
  • 3. Production operations are easier than one roasting

Secondary roasting tunnel kiln is divided into two categories

The secondary roasting tunnel kiln can be divided into external combustion type and internal combustion type according to the combustion method of volatile matter.

External combustion type secondary roasting tunnel kiln structure

The external combustion type secondary roasting tunnel kiln is divided into four sections, (1) isolation zone, (2) heating zone, (3) pre-cooling zone, and (4) main cold zone.

Use of internal combustion type secondary roasting tunnel kiln

The internal combustion type secondary roasting tunnel kiln directly controls the volatile matter and the small amount of liquid asphalt discharged from the impregnated electrode during the roasting process to directly burn in the kiln, provides part of the energy required for roasting, reduces the amount of externally supplied energy, and effectively Reduce the pollution of asphalt fume and carbon dust to the environment.

Size of graphite electrode

Item Unit HP RP
300-800mm 300-800mm
Electric resistivity Electrode μΩm 5.8-6.6 7.8-8.8
Nipple 4.2-5.0 5.0-6.5
Flexural strength Electrode Mpa 10.0-13.0 7.0-12.0
Nipple 18.0-22.0 15.0-20.0
Elastic modulus Electrode Gpa 8.0-12.0 7.1-9.3
Nipple 14.0-16.0 12.0-14.0
Bulk density Electrode ≥g/cm3 1.62-1.66 1.53-1.56
Nipple 1.74-1.80 1.70-1.74
CTE(100-600℃) Electrode x10-6/℃ 1.6-1.9 2.2-2.6
Nipple 1.1-1.4 2.0-2.5
Ash   0.3 0.5

Operation of internal combustion type secondary burning tunnel kiln

Operation of the internal combustion type secondary burning tunnel kiln: the impregnated electrode is placed in the steel cylinder, and the steel cylinder is placed on the kiln car surface. The tunnel kiln is divided into a pre-tropical zone, a soaking zone, an atmosphere adjustment zone, a high temperature zone and a cooling zone.