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Covered furnace has 2 structures

Release time:2019-12-16 From: Zhengnai Industry in China

There are 6 kinds of roasters used.

The roasters used are: ring roaster, tunnel kiln, downdraft kiln, underfloor roaster, rotary bed roaster, single chamber furnace, etc.

There are 2 kinds of ring roasters.

The ring roaster is divided into two types: a covered furnace and an open furnace. Open furnaces are mostly used to produce carbon anodes in the electrolytic aluminum industry, and most of the graphite electrodes are produced with a lid furnace.
 

Covered furnace has 2 structures

The covered furnace is also divided into two types: fire well and non-fire well.

Fuel used in ring roaster

Ring roaster uses gas, natural gas or heavy oil as heating fuel
 

All furnace chambers are under negative pressure

The pumping force generated by the smoke exhauster keeps the last several furnace chambers with a certain negative pressure, and the front high temperature furnace chamber should also maintain a small amount of negative pressure, so all the furnace chambers are under negative pressure.
 

Product mixing furnace precautions

When mixing various types of products, in order to facilitate the loading of the furnace and reduce waste products, large-size products should be installed in the lower layer, small and medium-sized products should be installed in the upper layer, and the furnace chamber must be inspected and repaired before being loaded into the product.

Ring roaster has a long production cycle

The cycle of the ring roaster has a long production cycle, including a furnace, heating, cooling, unloading, and minor repair of the furnace. 500-600h roasting is a high-energy process.
 

Expanding the volume of the furnace chamber

Increase the volume of the furnace chamber in order to increase production and reduce energy consumption.Some factories changed the fuel injection in the horizontal direction of the gas outlet on the upper side wall of the furnace chamber to the fire with the combustion frame and sprayed the fuel vertically downwards, which received good results.

Item Unit UHP HP RP
300-600mm 650-800mm 300-800mm 300-800mm
Electric resistivity Electrode μΩm 4.8-5.8 4.6-5.8 5.8-6.6 7.8-8.8
Nipple 3.8-4.5 3.8-4.5 4.2-5.0 5.0-6.5
Flexural strength Electrode Mpa 10.0-14.0 10.0-14.0 10.0-13.0 7.0-12.0
Nipple 20.0-26.0 22.0-26.0 18.0-22.0 15.0-20.0
Elastic modulus Electrode Gpa 9.0-13.0 10.0-14.0 8.0-12.0 7.1-9.3
Nipple 15.0-18.0 15.0-18.0 14.0-16.0 12.0-14.0
Bulk density Electrode ≥g/cm3 1.68-1.74 1.70-1.74 1.62-1.66 1.53-1.56
Nipple 1.77-1.82 1.78-1.84 1.74-1.80 1.70-1.74
CTE(100-600℃) Electrode x10-6/℃ 1.1-1.4 1.1-1.4 1.6-1.9 2.2-2.6
Nipple 0.9-1.2 0.9-1.2 1.1-1.4 2.0-2.5
Ash   0.3 0.3 0.3 0.5

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