Powdery active lime suspension roasting furnace with combustion stabilization system

Abstract

The invention discloses a powdery active lime suspension roasting furnace with a combustion stabilization system. The roasting furnace comprises a roasting furnace body, the side wall of the roastingfurnace body communicates with a material inlet pipe and a combustion chamber, and the interior of the combustion chamber is connected with a first burner. According to the invention, the structure ofthe powdery active lime suspension roasting furnace with the combustion stabilization system is simple, preheated raw materials are introduced from the material inlet pipe, fuel enters the interior of a fluidized bed, the raw materials and the fuel are mixed and pyrolysis is performed, hot air of a cooling system enters the roasting furnace body after the temperature of the hot air is raised to the required temperature of a working condition by the combustion stabilization system to guarantee smooth and stable combustion of the fuel in the roasting furnace body, so that the temperature fieldin the roasting furnace body keeps stable and uniform, and the quality of the product is stabilized. After working is started and ignition is performed, the temperature of the hot air from the coolingsystem is raised through the combustion stabilization system, so that the temperature of the interior of the roasting furnace body quickly reaches the working condition temperature, and a decomposition reaction in the roasting furnace body is performed as soon as possible.

Description

technical field [0001] The invention relates to the technical field of powdery active lime production, in particular to a powdery active lime suspension roaster with a combustion stabilization system. Background technique [0002] In recent years, active lime has increasingly become an important basic inorganic non-metallic material in the application of high-tech materials such as iron powder sintering, lightweight building materials, and chemical and chemical industries. With the development of social economy and environmental management, the market demand has increased sharply; The traditional lime production process is mainly used in the metallurgical industry, which is used to produce block lime with a particle size of more than 20mm, and the source of powdered lime is obtained by grinding the produced block lime. The preparation of powdered lime cannot achieve large-scale production, and it is difficult to meet the needs of the rapidly expanding market, and due to the ...

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Problems solved by technology

[0002] In recent years, active lime has increasingly become an important basic inorganic non-metallic material in the application of high-tech materials such as iron powder sintering, lightweight building materials, and chemical engineering. With the development of social economy and environmental governance, the market demand has increased sharply; at present, The traditional lime production process is mainly used in the metallurgical industry, which is used to produce block lime with a particle size of more than 20mm, and the source of powdery lime is to rely on grinding the produced block lime, but the existing The preparation of powdered lime cannot realize large-scale production, and it is difficult to meet the rapidly expanding demand of the market. Due to the limitation of traditional technology, powdered lime will cause a serious waste of more than 35% of limestone resources in the preparation; at the same time, traditional methods for The kiln for lime production can only be used for the production of lump lime, which belongs to the accumulation state heating and heat exchange, the heat transfer rate is small, and the thermal efficiency is low. It usually takes 6 hours or even longer from the input of limestone to the output of lime products. , and the daily output of a single set of equipment is difficult to achieve large-scale production of more than 1,000 tons, the production efficiency is low, preheating is difficult to recycle, and it cannot be used for the suspension roasting process of powdered lime;

[0003] In addition, in the existing suspension calcination process for powdered active lime, there is no suspension calcination furnace that can use limestone powder raw materials with a fineness of 150-350 mesh to directly produce powdered active lime; Industrial kilns are widely used in the cement clinker production system, that is, the calciner. In the cement clinker production system, the hot air from the grate cooler and the high-temperature flue gas at the tail of the rotary kiln provide thermal stability conditions for the stable operation of the calciner.

In the powdered active lime suspension roaster, the combustion air temperature from the cooling system is relatively low, generally in the range of 450~600°C, usually not higher than 600°C, and the decomposition temperature of limestone calcium carbonate is generally between 650~950°C , and the decomposition of limestone calcium carbonate in the roasting furnace is an endothermic reaction, which consumes more heat. At the same time, the material in the roasting furnace is in a suspended state, and the heat transfer and heat transfer efficiency is very high, and the heat consumption is fast. In addition, the impact of fuel ignition point and combustion rate , so that it is easy to cause the thermal system in the roaster to be difficult to maintain continuous stability for a long time, and in severe cases, it will cause process accidents that seriously affect production such as flameout and shutdown in the furnace, especially in the initial stage of system ignition and when there are large fluctuations in feeding. The impact will be more serious;

[0004] To sum up, since the lime produced by the existing domestic lime technology is mainly block lime, that is, there is no corresponding equipment that can be used to directly produce powdered active lime. The temperature of the hot air in the system is much lower, and the temperature of the hot air is not stable, especially at the initial stage of ignition of the system. In the absence of hot air, the ignition operation is quite difficult. Once an abnormal situation occurs during the operation of the entire roasting system, it will be extremely difficult big impact production

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