Boiling fluidizing roasting furnace

Abstract

The invention relates to a waste moulding sand or core sand reproducing device, in particular to a boiling fluidizing roasting furnace which comprises a furnace body. The furnace body is internally provided with a distributing heating chamber on the upper part and a roasting heating chamber on the lower part; the wall of the roasting heating chamber is provided with a burner; and the upper part of the distributing heating chamber is provided with a distributing cone. The boiling fluidizing roasting furnace is characterized in that: the bottom of the heating chambers is provided with a heat exchanging area, the burner is arranged above the heat exchanging area, an air collecting chamber with more than one air inlet is fixedly arranged below the furnace body, an air pipe is fixedly arranged on the top wall of the air collecting chamber, the lower end of the air pipe is arranged in the air collecting chamber, and the upper end of the air pipe is arranged in the heat exchanging area and provided with an air hood. The speed of cooling the roasted material is increased under the premise that the energy is fully utilized, so that the work efficiency of the existing waste moulding sand or core sand reproducing device is improved.

Description

technical field [0001] The invention relates to a recycling equipment for waste molding sand or core sand, in particular to a boiling fluidized roasting furnace. Background technique [0002] In various molding sand or core sand molding casting processes, a large amount of waste mold sand or core sand will be produced. The composition of waste mold (core) sand is complex and various. In order to improve the reuse efficiency of waste mold (core) sand, almost all Many manufacturers of resin sand and green mold sand use mechanical friction to regenerate the old sand for molding and core making; these treatment methods are difficult to remove the inert film and organic matter coated on the surface of the old sand, and the regeneration effect is limited. , resulting in lower casting quality and lower performance. Most enterprises discard the old sand after several reuses and replace it with new sand, causing environmental pollution and cost increase. The recycling and utilizati...

AI Technical Summary

Problems solved by technology

[0006] But above-mentioned waste molding sand or sand core regeneration equipment still has some deficiencies, at first, because the gas that enters below it is exhausted through the residual gas through burning of equipment top, therefore on the one hand can make the sand grain of roasting below equipment difficult to Cooling reduces the collection efficiency of the roasted sand particles. In other words, although the above-mentioned equipment utilizes the waste heat and fully utilizes the energy, it reduces the collection efficiency of the processed sand particles, and it is difficult to improve the working efficiency of the equipment as a whole. On the other hand, since the gas introduced from the bottom of the equipment is the residual gas after combustion, there is also the problem that the combustion-supporting gas (oxygen) in it cannot meet the combustion needs, making it difficult to fully burn the fuel injected from the burner. On the one hand, it will cause a waste of resources, on the other hand, it will pollute the environment, and the use of waste heat will outweigh the benefits; secondly, because the materials added to the equipment will flow downward from the outer periphery of the distribution cone after being dispersed by the distribution cone, which makes the inside of the equipment A working blind area is formed directly under the material distribution cone, which cannot make full use of the space inside the equipment and reduces its working efficiency. Moreover, since there is no filtering device between the lower sand bucket and the roasting furnace, the impurities contained in the material are extremely harmful. It may destroy the fluidized reaction in the lower part of the equipment and reduce the reaction efficiency

That is, the above-mentioned equipment still has the problem of low efficiency

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