Vertical preheater
Vertical preheating device for preheating refractory materials. It has the characteristics of reasonable structure, high thermal efficiency and high automation level, but it can not make full use of crushed materials (requiring feed particles 18 ~ 50mm) and is not suitable for raw materials with poor thermal stability. The vertical preheater is used in conjunction with the rotary kiln to preheat raw materials with poor thermal stability, such as active lime or dolomite.
Working principle of vertical preheater
The raw material enters the flue gas material isolation cover from the charging chamber, and distributes evenly in the annular stacking space between the two cylinders of the preheater body along the cone of the central distribution cone. The hot flue gas from the rotary kiln at 900 ~ 1000℃ enters the entire section of the ring stacking space through the intake hole of the gas collecting chamber, and flows backward towards the feed direction through the material layer to carry out adequate heat exchange. Materials preheated to 600 ° C are successively pushed into the kiln with the help of various push-rod disloaders. To achieve the purpose of uniform feeding. The flue gas whose temperature drops to about 300℃ after heat exchange is discharged into the atmosphere by the smoke exhaust machine of the electric precipitator.
Vertical preheater structure
The vertical preheater is composed of a charging chamber, a body, a push rod discharger, a bypass valve and an auxiliary chimney.
Use and maintenance of vertical preheater
The raw materials entering the preheater should be clean and free of impurities, otherwise they must be washed to avoid the formation of materials in the preheater and affect the operation. The height of the column in the charging chamber can be adjusted according to the production requirements, but the height of the column in the two charging chambers should be consistent. When feeding the body alternately, it should be strictly controlled by the timing switch or the program controller. The stroke of each push rod discharger should be adjusted to be completely consistent, and the pushing interval between the two push rod disloaders can be adjusted according to the production needs. Make sure that the material in the cylinder body is balanced, otherwise it will cause particle segregation. Under normal circumstances, every seven or eight days through the inspection door to clean. The refractory lining is inspected once a year, and the mechanical equipment is comprehensively inspected.
suspension preheater
Suspension preheater is a heat exchange device in dry rotary kiln system. The dry flour is exchanged and separated from the hot gas flow from the rotary kiln under suspension.
The main function of the suspension preheater is to make full use of the enthalpy (or heat) in the hot air discharged from the rotary kiln and decomposition furnace to heat the raw material, preheat it and decompose part of the carbonate, and then enter the decomposition furnace or rotary kiln to continue heating and decomposition, and complete the task of clinker firing. Therefore, it must have three functions, such as gas and solid phase can be fully dispersed and evenly distributed, rapid heat transfer, and efficient separation. Only with these three functions, and try to make it efficient, can we maximize the heat exchange efficiency (or efficiency), and create conditions for the high quality, high efficiency, low consumption and stable production of the whole kiln system.
