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Factors affecting production

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

 

2 reasons for calcining petroleum coke rotary kiln

The speed of movement of the raw material in the rotary kiln, the time of the raw material passing through the rotary kiln and the calculation of the filling rate in the kiln.

 

1 measure to improve the quality of calcination

1. Properly extend the time that the raw materials pass through the rotary kiln, which helps to improve the quality of the calcination. 2. The filling rate of raw materials in the kiln should not exceed a certain range, otherwise it will cause deterioration of operating conditions and reduce the quality of calcination.
 

2 factors affecting production

The filling rate of raw materials in the kiln is related to the hourly output of the kiln. 1. It is related to the operating system. 2. When the filling rate is high, the output is increased accordingly.
 

Three functions of material balance and heat balance

Prepare the material balance sheet and heat balance table, 1. Help to find problems, 2. Improve operation research, 3. Compare rotary kiln material burning loss and energy utilization.

Causes of charcoal burning

The reason why charcoal causes charcoal burning is that the kiln body enters too much air, and the amount of small particles and dust escaping from the kiln tail is related to the gas flow velocity in the kiln and the small particle content caused by coke wear.
 

4 material losses

In the loss of material, the loss of moisture and volatile matter is a normal loss, and the loss of carbon burned and unrecoverable escape should be minimized.
 

Measures to reduce fuel consumption

Make full use of the volatiles discharged from the coke. If the preheated primary air can be injected into the kiln or the secondary air is added to the appropriate part of the kiln to fully burn the volatiles, the amount of fuel can be reduced.

The use of tank calciner

The volatiles discharged from the raw materials are collected in the total flue of the upper part of the furnace, and are introduced into the required fire passage through the volatile drawing plate. If the volatile content of the raw materials is appropriate, the operation can be carried out without adding fuel, and all the heat of combustion by using the volatile matter can be used. Meet the needs of the calciner itself.
 

Tank furnace operation points

The operation of the tank furnace The main operation of the tank furnace is to adjust the temperature and negative pressure of the fire channel and control the discharge amount.

Size of graphite electrode

Item Unit HP
300-800mm
Electric resistivity Electrode μΩm 5.8-6.6
Nipple 4.2-5.0
Flexural strength Electrode Mpa 10.0-13.0
Nipple 18.0-22.0
Elastic modulus Electrode Gpa 8.0-12.0
Nipple 14.0-16.0
Bulk density Electrode ≥g/cm3 1.62-1.66
Nipple 1.74-1.80
CTE(100-600℃) Electrode x10-6/℃ 1.6-1.9
Nipple 1.1-1.4
Ash   0.3
 

The basis for developing negative pressure is based on 2 items.

The control parameters for the total negative pressure of the whole furnace and the negative pressure of each layer of the fire channel need to be based on the following points: 1. Effectively control the combustion of the combustible gas in the fire passage and the flow rate of the flame gas. 2. According to the actual situation of each tank furnace The situation and what kind of raw materials are calcined.
 
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