The actual output of 3000t/d cement production line has reached about 4000t/d, while the raw material grinding mill production capacity is limited, unable to meet the production demand. When raw material quality fluctuates and rotary kiln operates stably, the supply of raw material often becomes a difficult problem of production, increasing raw material fineness may be a solution method.

According to production practice, although bigger raw material size will bring difficulty to the clinker calcination, coal consumption will increase to a certain extent, but as long as make well the accurate production balance, making sure the power consumption of rotary kiln and raw material grinding mill can be stable and even decrease after the raw material size increases, the production cost will reduce.

1. Determine the reasonable fineness of raw material

The most basic requirement to ensure the clinker calcination is that the raw material has a good degree of dispersion.

2. Influence of raw material fineness on rotary kiln system

Considering the particle size which can be separated by preheater cyclone, if the material size becomes bigger, the gas-solid separation efficiency of the cyclone in each stage is improved and the material back mixing phenomenon is reduced and the temperature distribution becomes more reasonable.

3. Improvement measures of kiln system

1) increase the ventilation in the rotary kiln, prevent the atmosphere, and create the conditions for a small increase in the amount of coal used in the kiln head.

2) strengthen the burner adjustment control at the head of kiln, increase the fire intensity, and appropriately extend the high temperature calcination area.

3) Reducing the fineness of pulverized coal moderately will make the output of coal mill decrease slightly, but it will help to raise the temperature in the kiln, to ensure the rapid burnout of pulverized coal, and to avoid incomplete combustion at the kiln end.

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