New dry process cement production process and equipment Henan Hongxing

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New dry process cement production process and equipment

Cement is the main building material, which is widely used in industrial construction, civil construction, transportation, seaport, nuclear power, national defense construction and other new industrial and engineering construction fields. Cement production, around the satin burning as the core of continuous development, at present, to precalciner kiln as the representative New dry process cement production It is an internationally recognized production method representing the development level of contemporary cement.

The new dry process cement production process has a series of advantages, such as large production capacity, high degree of automation, high product, low energy consumption, low emission of harmful substances, large amount of industrial waste utilization and so on.

The process of new dry process cement production is usually divided into three stages: raw material preparation, clinker burning and cement grinding.

1、 Raw meal preparation and raw meal preparation

The main task of raw meal preparation stage is to pass limestone and auxiliary raw meal through crusher( Jaw crusher Hammer crusher Single stage crusher Composite crusher )Process raw meal to meet the needs of sintering system. Raw meal grinding system is a core process of cement production. After the raw material is discharged from the raw material mill, it is clinker and enters into the clinker warehouse, which further homogenizes the raw meal with different components and fineness, and integrates them to supply the later cement sintering system.

 Crushing production line

2、 Clinker firing

The sintering part is an important part in the production of new dry process cement. It is composed of preheating outside the kiln, decomposition, calcination in the kiln, clinker cooling and waste gas treatment Rotary kiln

1. Preheating outside kiln

The temperature of flue gas discharged from the rotary kiln is about 1000 ℃. A preheater is added at the kiln tail to preheat the raw material with the waste heat of warm flue gas, so that the temperature of raw material entering the kiln can reach 750-800 ℃. After preheating, clay dehydration and decomposition and partial decomposition of carbonate, the kiln is put into the rotary kiln for calcination, which improves the material reactivity and reduces the heat consumption of clinker.

The raw meal is first fed into the rising pipe at the inlet of the first stage cyclone, in which sufficient heat exchange is carried out. Then the gas and raw meal particles are separated by the first stage cyclone, and the collected raw meal enters the rising pipe of the second stage cyclone through the discharge pipe for the second stage After secondary heat exchange, it is separated by two-stage cyclone, and then enters rotary kiln through five-stage cyclone preheater for satin burning.

2. Decomposition

The main purpose of the calciner is to decompose the materials. In fact, it is a high temperature gas-solid multiphase reactor. Decomposition outside kiln is a process to increase the output of rotary kiln significantly. A large amount of endothermic calcium carbonate is decomposed in the calciner. The raw meal particles are dispersed in the calciner in suspension or boiling state, and the high-speed heat transfer process is carried out at the same time when the fuel is flameless, so that the raw meal can complete the decomposition reaction quickly. Thus, the heat load of rotary kiln is greatly reduced, and the production capacity of rotary kiln is increased by multiple.

3. Calcination in kiln

The main function of rotary kiln is to provide the required temperature and certain residence time for the complete decomposition of raw meal and the formation of clinker minerals, so as to burn the clinker. In the process of cement production, raw materials move from the kiln tail to the kiln head and exchange with the hot air flow in the kiln. The materials have a systematic chemical reaction, which divides the rotary kiln into drying zone, decomposition zone, firing zone and cooling zone.

4. Clinker cooling

 Cooler

High temperature clinker enters from kiln mouth Cooler After that, the bulk clinker needs to be broken by the crusher at the end of the cooler before entering the conveying equipment. After heat exchange between the cold air blown into the cooler and the clinker, part of it enters the kiln as secondary air, and the other part as tertiary air into the calciner or used for drying raw materials and fuels. The surplus hot air is discharged into the atmosphere through the chimney after dust collection.

3、 Cement grinding

After adding proper amount of gypsum and slag into clinker, the cement is ground into powder by cement mill, and then it can be sent out of the factory by packing or bulk.

According to different cement types and clinker composition, the proportion of clinker, gypsum and slag feed is controlled. The ball mill is mainly composed of steel balls. The grinding purpose is achieved through the collision of steel balls. After coming out of the mill, the coarse materials are recycled into the mill, and the materials with fineness up to the requirements, that is, the finished cement products enter the cement silo through the chute.

Henan cement kiln adopts new type cement crusher with high production rate and long service life. If you have any questions about the purchase of cement production equipment, model selection, operation and use, price and after-sales service, please contact our customer service staff online or call the hotline at 0371-67772626 at any time.

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