Technical field:
It belongs to the technical field of cement production equipment and relates to the end decomposing furnace of rotary kiln.
Background technology:
Calciner is a very important equipment in pre-decomposition system.In the pre-decomposition system, the tasks of fuel combustion, heat exchange and carbonate decomposition are heavy.Since the raw material and fuel are fully dispersed and mixed in the furnace, the fuel can be completely burned quickly in the furnace, and heat can be transferred to the material in time.The carbonates in the raw materials can be rapidly heated and decomposed, releasing the carbon dioxide in time.All these requirements depend on the gas and solid flow patterns in the furnace, i.e. the rational organization of the flow field in the furnace.The existing cement industry has rotary kiln tail decomposing furnace, including furnace body, three air channels, burner and feed box.Due to the uneven distribution of temperature inside the cone of calciner, local high temperature is easy to ligate, collapse of crust and necking, causing material flow in the furnace and burning loss of bricks and plug accidents in the furnace.At the same time, due to the lack of ventilation in the kiln, the rotary kiln production is low, the kiln strength is not enough, the quality is not good.All these have brought serious economic losses to the production of enterprises.
The utility model aims to provide a rotary kiln tail calciner, which can change the burning state of mixture and pulverized coal, eliminate the local high temperature of the cone of calciner, and prevent the material from blocking and shrinking.The technical scheme adopted is that the structure of rotary kiln tail decomposing furnace consists of furnace body, three air ducts, burner, feed box and smoke chamber.The guide plate is added to the furnace body at the entrance of the three air ducts, canceling the existing burner, and the burner extends into the nozzle position of the furnace body.In the cone of the decomposing furnace, the spray box is inclined and extends into the calciner body at a 45-degree Angle.The inner diameter of the chimney is 1920mm, the pouring material and insulation layer of the chimney fall 50mm, the pouring space of the upper arch is 50mm, and the kiln lining is replaced by silicon brick.The utility model adopts the technical scheme of improving the existing calciner, adding a guide plate at the entrance of the three air ducts to rotate the airflow in the furnace, make the gas evenly distributed, eliminate local high temperature, and cancel the air blowing of the burner.G, and move the burner position to avoid the conical position and produce pulverized coal.Under the rotation of three hot air, it can be burned more fully. The Angle of the feeding box is adjusted from the original 15 degrees to 45 degrees to avoid the material scattering and rising directly at the bottom of the box. After adjusting the Angle, the material can be poured down into the bottom.In the furnace, the material will produce the nozzle effect in the shrinkage process, thus reducing the temperature of the furnace bottom.Through the above measures, change the combustion state of materials and pulverized coal, eliminate local high temperature point, so as to avoid crusting.The smoke chamber is improved, the surface temperature of kiln tube is reduced, and the heat loss is reduced.The utility model greatly improves the burning state of materials in the calciner and the ventilation in the kiln, prolongs the service life of bricks and kiln linings, stabilizes the calcining of clinker and improves the quality of products.
