How to raise the production capacity of a cement plant is an important question that all customers are concerned about. To solve this problem, our industry experts draft this essay to give your industry some enlightenment.
APPROPRIATELY INCREASE THE CALCINATION TEMPERATURE
Appropriately increase the calcination temperature can not only increase the decomposition rate of cement but also is important to improve the production capacity of the kiln.
There are ways to increase the calcination temperature:
- Properly increase the focal ratio.
- Increase the air intake accordingly
There are two sources of hot air: one is the hot air drawn from the rotary kiln, which can increase the temperature of the primary air; the second is the hot air drawn from the air-swept coal mill, although it can also increase the primary air temperature, Because it contains more moisture and waste gas, the oxygen content is less, so that the internal material burns slowly, and the black burner is longer after use, which has a certain influence on the calcination of the rotary kiln. Improve the coal injection system, improve the batching scheme, increase the secondary air temperature, increase the primary airspeed and other measures to offset the influence of the water vapor in the hot air on the flame and meet the needs of the rotary kiln calcination.
- Increase in wind temperature.
When burning pulverized coal, the higher the air temperature around the pulverized coal, the easier the pulverized coal burns. The rotary kiln is mainly divided into the kiln head and the decomposition furnace for combustion. The combustion air and air temperature of the equipment kiln head and decomposition furnace are The secondary and tertiary winds of the grate cooler are provided. The temperature of the secondary and tertiary winds directly affects the burning speed and burnout rate of the pulverized coal. The key to determining the temperature of the secondary and tertiary winds is the speed and burnout rate of the grate cooler.
The key to determine the air temperature is the heat exchange rate of the grate cooler cold cut, increase the thickness of the material layer of the hot end of the grate cooler of the rotary kiln equipment, control the down pressure of each section, and ensure the reasonable opening of the air door of the grate cooler fan. Increase the air volume in the high-temperature section, and then add the air volume in the low-temperature section to increase the air temperature by two or three times while reducing the clinker temperature of the grate cooler. Generally, the secondary air temperature of the grate cooler of the rotary kiln is required to be 1100 ℃ -1200 ℃, and the tertiary air temperature is 950 ℃.
INCREASE THE BURNING SPEED OF COKE
When the external conditions are the same, the coke particle size is small, which can increase the combustion area and accelerate the combustion. It generates more heat per unit time and also increases the contact area. The production intensity can be greatly improved, but the coke particle size cannot be too small, otherwise, Combustion is too fast, and poor ventilation damages the normal operation of the kiln, so it is necessary to maintain a suitable coke particle size.
ENSURE MODERATE PARTICLE SIZE
Because of the large particle size, it has a great influence on the production capacity of the rotary kiln, which may cause impermeability and raw firing, and the residence time in the kiln is long, the decomposition rate is low, and the production capacity is reduced. Therefore, it is important to ensure that the particle size is moderate.