Application of weighing control in cement industry

Application of weighing control in cement industry

At the same time, lijun has a high level of innovation ability, in the process of weighing control and force measurement field to provide customers with flexible and cost-effective solutions

In modern NSP cement production, preheater raw powder conveying metering control of rotary kiln, the kiln head and decomposition furnace pulverized coal conveying metrological control measurement control, some powder materials such as the cement industry in the modern new dry process cement production, preheater raw powder conveying metering control of rotary kiln, kiln head and decomposition furnace pulverized coal conveying measurement control measurement control, some powder materials such as production of cement industry products, quality plays an important role. Therefore, how to ensure the powder in the process of measurement and control of the non-chaotic, rapid response ability and non-periodic precision, is now every cement enterprise must face and solve the problem.

The process of cement plant is more diverse, at present more is the dry or wet rotary kiln cement process, through the raw materials from the raw material field after the crushing of limestone and various raw materials according to a certain ratio into the raw material mill, qualified cement raw materials are stored in the raw material warehouse to prepare for the next process; After pulverized coal is burned in the kiln, it forms a high temperature flame and emits a lot of heat. The high temperature gas moves along the rotary cylinder to the kiln tail under the pumping of high temperature fan at the kiln tail. The calcining of rotary kiln is divided into six belts: drying, preheating, decomposition, heat release, firing and cooling. In the process, preheating and decomposition are processed outside the kiln by five-stage cyclone tube and decomposition furnace. In the whole process of production, the raw material quality is determined by the raw material quality, the raw material quality and the firing process determine the clinker quality, and the clinker and clinker ingredients ultimately determine the cement quality.

Continuous weighing features:

(1) high chaos and non-chaos, whether it is a belt scale, weighing feeder is still a solid flow meter using anti-harsh environment design, belt scale with two sensors, weighing sensor adopts the patent technology for the application characteristics of belt scale, namely stainless steel triple beam technology. The integrator has the function of automatic angular difference compensation to overcome the error caused by off-load. Solid flowmeter is specially designed for cement production characteristics, completely overcome the impact of airflow on the measurement.

(2) Strong anti-interference, through EMC strict testing, can overcome the interference in the production environment.

(3) Strong utility, content and optimize the production and management of the plant.

(4) Easy to operate and maintain, simple and reasonable interface structure, and easy to maintain.

(5) Strong expansibility, modular design for the system advancement and the realization of technical transformation, leaving room for expansion.

(6) Good openness, through SmartLinx board to connect a variety of buses. Raw material farm: mainly responsible for the input, storage, crushing, blending and feeding of the main and secondary raw materials such as limestone, clay, marl, chalk and shell limestone. The raw materials can be transported by water or by land, and the unloader discharges the raw materials to the shore or the tank. Then, the stacker will carry the belt conveyor to the raw materials piled up to the mine, coal yard, auxiliary raw materials yard. The belt conveyor transports the raw material from the raw material farm to the corresponding production plant. In the whole logistics control and management need to choose belt scale equipment.

Raw ingredients and grinding: The crushing and grinding of raw materials, as of limestone and silica. The limestone is pounded into fine powder, with a certain amount of clay, mixed with water, artificial or mechanical stirring average mud. Place the mud on the plate, heat and dry. The dry material is beaten into blocks and then calcined in a lime kiln.

The weight feeder and solid flowmeter are used to automatically control the total amount of grinding materials to realize the load control of the mill.

Clinker firing: the raw material is calcined in the lime kiln, and the carbonic acid gas in the limestone all escapes. The calcined burning block is then cooled and broken.

Cement grinding: after lime kiln calcining clinker cooling and destroyed, then add gypsum powder, and add differences product after fine grinding machine, the output of cement.

Measurement of finished product: the pulverized cement is significantly different from the bulk or granular cement in terms of material mobility and natural stacking Angle. The mobility of most powdered materials used in cement production is most strongly influenced by water and air pressure. Generally, the increase of water content of the material makes the activity of powder material worse, which is reflected in the tendency of the material to stick together and have greater adhesion. The greater the moisture content is, the stronger the adhesion is, and the worse the activity is. And dry or accompanied by air flow of powder material activity is very strong, the performance of the material tends to self-overflow (artesian), the greater the gas content, the stronger the activity.

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