A comprehensive introduction to the process flow of the new dry process cement production line
Date：2019-06-26 15:57 Source：未知Views:
With the advancement of modern science and technology, the new dry process cement production process has also been greatly optimized, meeting the needs of modern industrial development for energy saving and low consumption. This paper introduces the new dry process cement production process in detail.
New dry process cement production line
Suspension preheater and precalciner kiln process are new technologies used by the contemporary cement industry to produce cement, often referred to as new dry process cement technology. The new type of Yufa cement production is based on suspension preheating and pre-decomposition technology, and modern production technology and industrial production new achievements, in line with high productivity requirements of production technology. The following three processes of the new dry process cement production process:
1. Raw material preparation
Raw material preparation is the initial step of cement production. Its main task is to crush the limestone, and then send it to the grinding head feeding bin through the conveyor with clay and other auxiliary materials. After the ingredients are metered, the raw material mill is quantitatively fed and dried. Dry and grind. After the grinding of the raw material, two continuous air homogenization reservoirs are pumped by pneumatic lifting, and the raw materials and the raw materials are further homogenized by air stirring.
Raw material mill
2, clinker calcination
Clinker burning is a key part of cement production, mainly including the following production processes:
(1) Preheating outside the kiln
In the process of producing clinker in the rotary kiln, a preheater is added at the end of the kiln, and the raw material is preheated by the waste heat of the flue gas. After the preheating and the decomposition of part of the carbonate are completed, it is placed in a rotary kiln for calcination, so that the reaction speed of the material can be greatly increased, the calcination process can be accelerated, and the heat consumption of the clinker can be effectively reduced.
The kiln decomposition technology of the new dry process cement is a kind of calcium carbonate decomposition reaction which can significantly increase the output of the rotary kiln and can absorb a large amount of endothermic heat in the decomposition furnace. In the decomposition process, the temperature difference is used to carry out the rapid heat transfer process while the fuel is subjected to the flameless combustion, so that the raw material can quickly complete the decomposition reaction, on the one hand, the heat load of the rotary kiln can be reduced, and on the other hand, the heat load can be greatly reduced. Improve the production capacity of rotary kiln.
Calcination is carried out in a rotary kiln, which provides sufficient temperature and reaction time for the complete decomposition of the raw meal and the formation of clinker minerals to ensure the formation of clinker.
After the clinker comes out of the rotary kiln and enters the cooler, it undergoes a series of cooling measures to allow the material to cool rapidly. The high-pressure wind in the lower part of the seesaw can be used for rapid cooling, and then the medium-pressure wind is cooled as the trampoline advances. The cooled clinker is in the form of tiny particles that can pass through the fine grid strips and the discharge chute of the cooler into the conveying equipment.
(5) Waste gas treatment
After the cement production is completed, the exhaust gas needs to be treated to avoid environmental pollution. For the current modern cement production line, the exhaust gas treatment system mainly refers to a complete system of exhaust chimneys from the hot air outlet of the first-stage preheater to the tail of the kiln, including the kiln tail high-temperature fan, electric precipitator, humidification tower, etc. . Because of this, the new dry process cement production process produces less pollution than traditional wet process cement production, making the production process cleaner and more environmentally friendly.
3, made of cement
Cement grinding is the end process of cement manufacturing, and it is also a process that consumes more electricity. Its main function is to grind cement clinker (and gelling agent, performance adjusting material, etc.) to a suitable particle size (expressed by fineness, specific surface area, etc.) to form a certain particle gradation and increase its hydration area. Accelerate the hydration speed to meet the requirements of cement slurry condensation and hardening. Clinker and gypsum are sent to the cement mill for grinding through a quantitative feeder. The cement mill together with the classifier forms a so-called circulating cement mill. When grinding, it can also be mixed with clinker and gypsum according to the product requirements to produce different types or grades of cement.
In short, in the whole production process, in order to ensure that raw materials, fuels, materials and raw materials, clinker and cement meet the requirements, the production process must be controlled and quality monitored, and should be carried out by personnel with high professional skills. Standardized operation, in order to ensure that the horizontal production of finished products meets the technical indicators defined by Portland cement, ensure the quality of cement production, and improve production efficiency and technical level.
Our company can provide customers with high-quality dry-process cement production equipment, and at the same time, according to customer needs, advanced pre-decomposition technology can be used to formulate a reasonable dry-process cement production process to ensure the production quality of cement.