The Roles of Rotary Kiln Preheater

Rotary kiln preheater is the usage of flue gas in the tail of the boiler through the internal heat sink will enter the boiler before the air preheated to a certain temperature heating surface. Used to improve the heat exchange performance of the boiler, reducing energy consumption. Vertical preheater has become an important equipment in the cement production line. The quality and operation of the preheater are directly related to the quality, efficiency and cost of the cement calcination. Therefore, ZK engineers pointed out that besides the cement kiln, as the main equipment is concerned, the design and manufacture of preheater should also be given sufficient attention. As a complete set of cement production equipment manufacturers, the following explain the main role of the preheater.

The vertical preheater is one of the main equipment of the cement plant equipment. The main function of the cement preheater is to send the upper limestone material to the preheater body and use the high temperature exhaust gas (850 ℃) discharged from the kiln after calcination. The preheater will preheat the material evenly above 800 ° C. During the preheating process, 30% CaCO3 is decomposed in the preheater and then pushed by the hydraulic fader into the preheater. This calcination process not only makes limestone greatly shorten the time calcined in the kiln, but also obtain a higher degree of activity of lime.

The vertical preheating is a device that is outside the kiln, and the cooling equipment is a separate device outside the kiln. The preheater is a heat exchange device that causes the temperature of the exhaust gas to drop rapidly and the temperature of the raw material powder rises rapidly, thus reducing the heat Consumption, improve production and quality, energy conservation, comprehensive utilization. For example, the suspension preheater, which is characterized by dry raw powder and rotary kiln hot gas, in the suspended state for heat exchange. In the suspension preheater, the raw material powder is evenly dispersed in the air flow, the surface of the raw material powder particles directly contact with the hot air, heat exchange area is very large, the heat transfer effect is good. Moreover, because the raw material particles are small, heat quickly from the surface to the center. Therefore, the heat transfer speed is also very fast, raw materials can be increased to 750 ゜ C above in the tens of seconds from the normal temperature. Since the suspension vertical preheater is a highly efficient heat exchange device, so this kiln type of heat is very low, only 3140 ~ 3560 kJ / kg clinker.

The vertical preheater is used with rotary kiln, make the high temperature air from kiln tail fully utilize, play a role in saving energy and reducing consumption, it’s an energy saving and environment - friendly product.