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Overview of lime kiln calcining active lime
December 25, 2019 Anonymous

煅烧活性石灰,可以说已经有了成熟的工艺和丰富的生产经验。 The use of shaft kiln for calcination of active lime can be said to have mature technology and rich production experience. But to really increase output and quality, in addition to strengthening production management, it is more important to work hard on equipment and control measures. The shaft kiln calcination process requires that solid fuel coal and limestone be mixed as uniformly as possible before entering the kiln. Only in this way can a good calcined layer be cultivated, reducing the generation and over-burning of the finished ash. In addition, the calorific value of fuel can be effectively used to save energy and coal consumption. The cloth method of the old ordinary shaft kiln is generally very simple. Generally, there are manual charging, bell type, rotating slip nozzle, etc. These devices are simple, and often the fuel and limestone materials are separated after separation into the furnace or have different particle sizes. Generally, large pieces of fuel and large pieces of limestone are distributed near the kiln wall, and the permeability is better. Small pieces of limestone and pulverized coal are concentrated in the center. Coupled with the furnace wall effect of the combustion-supporting wind, the fuel distributed near the furnace wall will burn too fast, which will cause the calcination zone to become misaligned. 很容易使石料冲击炉壁的耐材层,造成损失。 In addition, slipper-type spreaders can easily cause stones to impact the refractory layer of the furnace wall, causing losses. So choosing the right cloth equipment is a key part of turning the raw materials into the furnace.

Shaft kiln calcining lime requires the distribution of the charge in the furnace to be a preheating layer, a calcining layer, a cooling layer, and a finished product layer. And have stricter requirements and control of the temperature of each layer. 150° 以下比较合适。 The upper part of the preheating layer, that is, the top temperature of the furnace, is more suitable to keep below 150 ° . 1100° 左右。 The calcined layer generally needs to maintain the optimal calcination temperature of limestone, which is generally around 1100 ° . The cooling layer is when limestone is calcined and decomposed to form lime crystals. In this process, rapid cooling is required to form the finished active lime. The lower the temperature of the finished layer, the better. 40~80° The ash out temperature is generally 40 ~ 80 ° . It is necessary to ensure that the temperature of the layer of the charge in the furnace is stable and the layer is not inclined. Ash extraction equipment is also important. Many ordinary shaft kilns have no sealed and continuous ash discharge equipment, the ash discharge is uneven, and the ash discharge must be stopped. This has caused problems such as partial kiln pumping, and unstable kiln-like production.

Calcining lime is a continuous production process. In the process of ash, interrupting the combustion air is a taboo for calcination. 的简陋,出灰过程中的密封一直是一个难题。 In many furnaces, due to the simplicity of the ash discharge equipment , the sealing during the ash discharge process has always been a problem. If the combustion air is not interrupted during ash release, the combustion air will leak through the ash outlet channel. Not only pollute the environment, but also make it difficult to carry out ashing. Therefore, generally only the way to stop the wind and ash. The disadvantage of this method of stopping the wind and ash is that the calcination process of lime is interrupted softly. Although the calcination layer is not turned off, the reasonable calcination temperature is definitely not stable. Not only will the output be greatly reduced, but also the temperature and height of the calcination layer The change will lead to a fatal effect on the quality of lime.

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