Compound lime kiln

Abstract

The invention relates to a compound lime kiln, comprising a kiln body, a charging equipment, a discharging equipment, a control system and an exhaust system.A preheating zone, a\calcining zone and a cooling zone are in the kiln body. A smoke outlet or a fume extractor is arranged in the preheating zone, and the smoke outlet or the fume extractor is connected with the exhaust system. A cooling tuyere is arranged in the cooling zone, and a cooling air inlet is connected with a cooling fan. Two to four granule kiln bins are arranged in the device. Granule hoppers, granule charging locks and cooling air outlets are arranged in the granule kiln bins. The underpart of the granule kiln bins are connected with the cooling zone. The cooling air outlet is connected with the exhaust system. Granule kiln bins are arranged in the device in the invention, exhaust gas after lime cooling is utilized to preheat granule limestone materials, and simultaneously large particle and granule materials are calcined, so that the preheating fully utilizes resources of limestones, effectively utilizes energy, reduces consumption and improves productivity. The cooling air does not enter the calcining zone, which is beneficial to an improving of calcining effects of the calcining zone, a reducing of a pressure load of the kiln body and an improving of qualities of the lime products.

Description

technical field [0001] The invention belongs to the technical field of building materials and chemical production equipment, relates to equipment for calcining materials, and in particular relates to a composite lime kiln for simultaneously calcining large and small particles. Background technique [0002] Lime is an important building material as well as an important raw material in the fields of metallurgy and chemical industry. In the prior art, dolomite and limestone are used as raw materials, and a shaft kiln with a burning beam is used to calcine lime. The disadvantage of this process is that the direction of furnace gas flow in the shaft kiln is opposite to that of the stone material, that is, the stone material runs from top to bottom, the furnace gas flows from the bottom to the top, the gas resistance of the stone material is large, and the pressure in the furnace is high, which is easy to occur Gas segregation phenomenon, resulting in uneven heating of limestone, ...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the direction of the furnace gas flow in the shaft kiln is opposite to that of the stone material, that is, the stone material moves from top to bottom, and the furnace gas flows from bottom to top. Gas segregation phenomenon causes uneven heating of limestone and affects product quality

Large and small particles are mixed and calcined together, the small particles will fill the gaps between the large particles, and high gas resistance will be generated in the kiln body, which will affect the calcination effect and cause raw or over-fired

Therefore, generally calcined limestone chooses stones with a particle size of 30-100 mm, and stones with a particle size of less than 30 mm can only be discarded or used for other purposes, which is a waste of resources.

[0004] On the other hand, since the cooling air enters the kiln body from the bottom of the kiln body, passes through the cooling zone to cool the lime, then passes through the calcination zone and the preheating zone, and then flows from the upper part of the kiln together with the flue gas to the exhaust system. The cooling wind passes through the entire furnace, affecting the calcination zone. Combustion increases the pressure load in the kiln body

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