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Horizontal rotating bed calciner

Release time:2019-11-12 From: Zhengnai Industry in China

Discharge amount is inversely proportional to calcination quality

Calcination quality directly affects the performance of graphite electrodes.
The size of the calcination tank is fixed, and the time for the raw material to pass through the calcination tank is mainly affected by the discharge amount, and is related to the bulk density of the material. In the case of normal operation, the discharge amount is inversely proportional to the calcination quality, that is, the discharge amount. The more, the lower the true density of the calcined coke.

Use of horizontal rotating bed calciner

The horizontal rotating bed calciner consists of a rotating hearth and a cooling cylinder. The raw material is added to the outer ring of the hearth rotating in the horizontal direction through the feeding mechanism, and evenly distributed along the concentric road. Each rotation is transferred from the discharging rod to the next concentric road, and the coke passes through several concentric lines and reaches the central part of the furnace. The soaking zone, the soaking zone ensures that all coke can be calcined at the same temperature.
 

Furnace temperature of horizontal rotating bed calciner

The furnace temperature of a horizontal rotating bed calciner is mainly derived from the combustion of volatiles of petroleum coke, but it is necessary to supplement part of the fuel (heavy oil or gas).

Advantages and disadvantages of horizontal rotating bed calciner

Compared with other calcining equipment, the horizontal rotating bed calciner has less floor space, uniform calcination quality and lower carbon loss than rotary kiln, but the equipment structure is more complicated and the investment is large.
 

Reasons for using drying equipment

The raw materials are generally calcined in the raw material production plant. After calcination, the moisture of the coke has been reduced to less than 0.3%. Sometimes the water is affected by improper storage, storage or transportation, and the process of loading and unloading, so it has to be baked after being transported into the factory. Dry to reduce moisture to the level after calcination.
 

Size of graphite electrode

Item Unit RP HP UHP
300-500mm 300-500mm 300-500mm
Electric resistivity Electrode μΩm 7.5-8.6 5.5-6.8 4.6-6.2
Nipple 4.5-6.0 4.0-5.5 3.5-5.0
Bending strength Electrode Mpa ≥7.5 ≥10.0 ≥10.5
Nipple ≥16.0 ≥18.0 ≥20.0
Elastic modulus Electrode Gpa ≤9.0 ≤13.0 ≤14.0
Nipple ≤13.0 ≤15.0 ≤20.0
Bulk density Electrode g/cm3 1.54-1.62 1.62-1.70 1.66-1.73
Nipple 1.70-1.78 1.72-1.80 1.75-1.82
CTE(100-600℃) Electrode 10-6/℃ 2.20-2.60 1.80-2.20 1.20-1.50
Nipple 1.50-1.90 1.50-1.80 1.10-1.40
Ash % ≤0.3 ≤0.3 ≤0.3

How the drying equipment works

There are many types of equipment used for material drying. The working principle is to evaporate water at a certain temperature.
 

Drying equipment can be classified according to 3 ways

1. According to the different operating pressure, it can be divided into normal pressure type or decompression type. 2. It can be divided into air, flue gas or other medium according to the difference of dry working medium. 3. According to the flow direction of material and heat medium, it can be divided. It is several structures such as forward flow, reverse flow or cross flow.

There are 2 kinds of common drying equipment

Commonly used dryers include cylindrical dryers and fluidized dryers.

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