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Difference Between Dry and Wet Production Methods of Cement Rotary Kiln

Published:2022-04-08

Cement rotary kiln belongs to the category of building materials equipment, which is a kind of rotary kiln. Cement rotary kiln is the main equipment of cement clinker dry process and wet process production line.

working principle

The cement rotary kiln operates under heavy load and alternating at a slow speed at high temperature, and the maintenance of its accessories and the level of thermal system control are related to the safety and efficiency of the rotary kiln. The maintenance of the transmission device focuses on the lubrication of the equipment, the running state, the dynamic detection and the meshing accuracy of the large and small gears. The installation accuracy of the supporting device determines whether the rotary kiln can operate safely and reliably. During the operation, attention should be paid to the reasonable control of the distribution of the supporting rollers of each gear, the arrangement of the supporting rollers, the up and down pressure and time of the hydraulic retaining rollers, and the force of the supporting rollers. , the gap between the wheel belt and the backing plate. The quality of the sealing device directly affects the thermal system and operating cost of the rotary kiln. Strengthening the data collation and analysis of the daily maintenance of the rotary kiln is beneficial to the management of the equipment.


What is cement clinker?

Cement clinker is a semi-finished product obtained by using limestone, clay, and iron raw materials as the main raw materials, which are prepared into raw materials in appropriate proportions, burned until partially or completely melted, and then cooled. In the cement industry, the main chemical components of the commonly used Portland cement clinker are calcium oxide, silica and a small amount of alumina and iron oxide. The main mineral composition is tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium ferric aluminate. Portland cement clinker and an appropriate amount of gypsum are ground together to form Portland cement.

What is the dry process and wet process of cement kiln?

The dry process and wet process of cement kiln are mainly based on the moisture content of the material and the treatment process.


The dry kiln mainly processes the raw material in the kiln into dry powder of raw material. Generally, the moisture content is less than 1%, so this kiln can reduce the heat required for heating the autoclaved moisture, but the material particles in this method have poor fluidity. It leads to poor mixing of raw materials and uneven composition.


The wet kiln mainly processes raw material slurry with water content of 32%-40%. The main advantage of this kiln is that the fluidity of the raw material slurry is good, so the raw materials are mixed evenly, and the processed clinker is of high quality. The heat required to heat the clinker to evaporate the water is high, and the heat consumption is high. According to the ratio of kiln length and diameter, it can be divided into short kiln and long kiln. According to different heating methods, it is divided into internal heat kiln and external heat kiln. The burner of the internal heat kiln is at the front end of the kiln head cover, and the raw meal in the kiln is heated by the high temperature flue gas and heat generated by burning pulverized coal in the kiln. The heating process is in carried out in the kiln. External heating kiln means that the heater of the kiln is outside the kiln and uses energy such as electric energy to heat the furnace tube, so that the raw meal in the furnace tube reaches the calcination temperature and enters the kiln to react.


Dry-process cement kilns and wet-process cement kilns differ greatly in terms of the moisture content of the processed materials and the material treatment process:


1. The dry process cement kiln mainly processes the raw material in the kiln into dry powder of the raw material. Generally, the moisture content is less than 1%, so this dry process cement kiln can reduce the heat required for heating the autoclaved moisture, but this method also has The disadvantage is that the material particles in the kiln have poor fluidity, resulting in poor mixing of raw materials and uneven composition.


2. Wet cement kiln mainly processes raw material slurry with water content of 32%-40%. The main advantage of this kiln is that the raw material slurry has good fluidity, so the raw materials are mixed evenly, and the processed clinker is of high quality. However, the heat required by the kiln to heat the clinker to evaporate the water is high heat consumption, which is not energy-saving and environmentally friendly.


At present, Hongke Heavy Industry has launched a new dry process cement rotary kiln, which has improved performance and finished product quality. When the new dry process cement kiln is running, the materials in the kiln tumble along the radial direction under the action of the rotational speed. At the same time, it moves in the axial direction under the action of its own gravity and the inclination of the kiln. In the process of moving, it conducts heat and mass transfer with the hot flue gas generated in the kiln, and complex physical and chemical reactions occur in the kiln to produce specified qualified products.


Hongke Heavy Industry has new dry process cement kiln equipment with complete models and stable operation, and the finished products processed by the equipment have high activity and uniform composition. The whole equipment is environmentally friendly and energy-saving. It is worth investing in. Users are welcome to consult the price of new dry process cement rotary kiln for free. and other information.


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