Basic Info.
Transmission Type
Flexible
Automatic Production Line
Comprehensive
Flexible Production
Intelligent Manufacturing
Rhythm
Flow Production Line
Production Scope
Product Line
Product Description
NSP cement production process
I Cement production raw materials and ingredients
The main raw material for the production of Portland cement lime raw material and clayey raw materials, and sometimes based on fuel quality and varieties of cement mixed with the corrected of raw materials to supplement the lack of certain ingredients, using industrial waste as a cement raw material or mixed material production.
1, limestone raw material
Calcareous material calcium carbonate is the main component of limestone, marl, chalk, and shells. Limestone is the main raw material for cement production, for every ton of clinker takes about 1.3 tons of limestone, more than 80% of the raw meal is limestone.
2,clay feedstock
Clayey raw materials mainly provides Silica,Aluminum oxide and a small amount of Ferric oxide in Cement clinker. Feedstock of natural clay clouds loess, clay, shale, siltstone, and river mud. In addition, there are industrial residues such as fly ash, coal gangue. Clayey finely dispersed sedimentary rock, composed of different minerals, such as kaolin, montmorillonite, hydro mica and hydration aluminum silicate.
3,the corrected of raw materials
When calcareous material and clayey raw materials with the the resulting raw ingredients can not meet the demand proportioning scheme (some content some content) must be based on the lack of components, mixed with a corresponding correction of raw materials.
(1) siliceous corrected raw materials containing more than 70%
(2) Aluminum corrected raw materials containing more than 30%
(3) iron corrected raw materials containing more than 40%
II Portland cement clinker mineral composition
Portland cement clinker minerals are mainly tricalcium silicate , dicalcium silicate , tricalcium aluminate and iron and aluminum acid calcium .
III Process
1 Crushing and pre-homogenization
(1) broken cement production process, most of the raw materials to be broken, such as limestone, clay, iron ore and coal. Limestone is the raw materials for the production of cement consumption, after mining the larger particle size, high hardness, therefore limestone is to produce the maximum amount of cement raw materials, mining granularity, high hardness, limestone crusher in cement plant materials broken occupies an important position.
The crushing process than the process of grinding economic and convenient, reasonable selection of crushing equipment and grinding equipment is very important. Before the material enters the grinding equipment, it is possible for the bulk material is crushed to a fine, uniform particle size, in order to reduce the load on the grinding equipment, to improve the yield of Fen machine. Material crushing is to reduce the phenomenon of the separation of materials of different particle size in the transport and storage process, something in the uniform composition of raw material, to improve the accuracy of the ingredients.
(2) raw material pre-homogenizing pre-equalization technology is in the retention of the raw materials, to take the process to use the scientific stacker reclaimed technology, raw materials are initially raw material yard along with storage and homogenization function.
In the stockpiling by the feedstock prehomogenization basic principle is stoker the incoming raw material continuously in a certain way piled as much as possible parallel to each other, stacked vertically, and the material layer of the same thickness. Reclaimer in the direction perpendicular to the material layer, as much as possible at the same time cut all the material layer, in turn cut until you get finished tile straight to take ".
Significance:
(1) all of the ingredients to reduce fluctuations in the quality and stability firing system in order to facilitate the production of higher quality clinker production.
(2) expand the utilization of mining resources, improve mining efficiency, maximize mine coverings and laminated or less, not in the process of mining waste rock.
(3) be relaxed with the mining quality and requirements, reduce the cost of the exploitation of the mine.
(4) strong adaptability to the sticky and wet materials.
(5) to provide long-term stability of the raw materials for the plant, in the yard of the different components of the raw ingredients, making it a pre-ingredients yard, to create conditions for stable production and improve equipment operation.
(6) the high degree of automation.
2 Raw material preparation
Each producing 1 ton of Portland cement in the cement production process to be grinding at least 3 tons of materials (including all kinds of raw materials, fuel, clinker, mixed materials, gypsum), according to statistics, the dry process cement production line grinding operations need to consume power accounts for about 60% of the power of the whole plant, which accounted for 30% of the raw material grinding, accounting for about 3% of coal mill, cement grinding about 40%. Therefore, a reasonable choice of grinding equipment and process optimization of process parameters, the correct operation, and control of the operating system, is of great significance to ensure product quality, reduce energy consumption.
How it works:
Motor drive disc rotation through deceleration devices, materials millstones Central Lock wind feeding device fall by cutting downpipe to pay to the disc edge, under the effect of centrifugal force left behind by the rolling mill roll grinding, the crushed material from the disc spills over the edge, to be brought up from the nozzle speed up hot air drying, depending on the airflow velocity, part of the materials brought by the airflow efficiency classifiers, meal, returned after separation on the disc, re-grinding; fine flour the mill, with the air collection system cleaning equipment down, is the product. No coarse material brought up by the hot air, overflow feed selected powder machine bucket elevator outside the circle of the disc after the coarse particles fall back disc extrusion grinding again.
3 Raw material homogenization
Dry cement production process, stable The pit entry of raw material composition is stable clinker burning thermal system on the premise, the raw material homogenization system plays a gatekeeper role last stable Rujiao raw ingredients.
Homogenization principle:
The use of air mixing, the gravity, resulting in a "funnel effect", so that the raw material powder downwardly unload, try to cut the multilayer material surface, and sufficiently mixed. The use of different fluidizing air so that the the Stockphoto parallel to the material surface of different size expansion of the fluidizing effect, the unloading of some regions, some regions fluidizing, thereby Stockphoto material surface is inclined, radial mixing homogenizer.
4 Preheating decomposition
Preheating of the raw material and partially decomposed by the preheater, instead of some of the features of rotary kiln, to shorten the length of the back kiln, while the kiln heat transfer process of the gas feed to the accumulation of state, moved to the inner state of suspension preheater carried out so that the raw material can be discharged with the kiln hot gases sufficiently mixed, increase the contact area of the gas feed, fast heat transfer, heat exchange efficiency is high, to achieve the goal of improving the kiln system production efficiency, reduce heat consumption of clinker burning purposes.
How it works:
Preheaters main function is to make full use of the waste heat discharged by the rotary kiln and calciner heating raw material, preheat the raw material and part of the carbonate decomposition. In order to maximize the efficiency of heat transfer between the gas-solid calcining system of high-quality, high-yield, low consumption, it is necessary to have a gas-solid dispersed evenly, the heat exchanger rapid and efficient separation of the three functions.
(1) material dispersed
(2) The gas-solid separation
When the gas stream to carry the feed powder into the cyclone cylinder, forced in the annular space between the cyclone barrel and the inner cylinder (exhaust pipe) rotating flow, and the downward movement while rotating the barrel to the cone , has been able to extend to the end portion of the cone, and then turned on the rotation rise from the exhaust pipe.
(3) pre-decomposition
The emergence of the precalciner technology is a technological leap cement calcining process. It is between the preheater and the rotary kiln additional decomposition of the furnace and the utilization of kiln inlet rise flue, provided that the fuel is injected into the device, so that decomposition of the endothermic process of fuel combustion in an exothermic process and raw materials carbonate in the decomposition furnace quickly suspended state or fluidized state, the decomposition of the kiln feed rate increased to 90% or more. Moved exploded original carbonate decomposition of tasks carried out in a rotary kiln, furnace; the fuel most Precalciner Add small part by Yaotou Add, reducing the thermal load of the kiln with, extending liner material life, is conducive to large-scale production; mixed fuel and raw material, fuel burning heat timely passed to the materials, combustion, heat exchangers, and carbonate decomposition process has been optimized. Quality, high efficiency, low power consumption, and thus has a range of excellent performance and features.
Exchange 80% in the inlet conduit. Raw material in the feed preheater pipe in the updraft and high-speed impact of material folded steering on with the air movement, while being dispersed.
Calcining of cement clinker
After the completion of preheating and precalcining the raw material in the cyclone preheater, the next step is to enter the firing of the rotary kiln, clinker.
Carbonate in the rotary kiln further rapid decomposition and a series of solid-phase reaction to produce cement clinker, and other minerals. With the temperature of material near, and other minerals will become liquid, dissolved in the liquid phase and the reaction was carried out to generate a large number of (clinker). Clinker after baking, the temperature began to decrease. Hot clinker rotary kiln will be unloaded by the cement clinker cooler cooling to the downstream conveyor, storage libraries and cement mill can withstand temperature, while recovery of the sensible heat of the hot clinker to improve the thermal efficiency and clinker quality.
Cement grinding
Cement grinding is the last of the cement manufacturing process, and also a power-up process. Its main function is to cement clinker (and gelling agent, performance tuning materials, etc.) grinding to appropriate particle size (fineness, specific surface area), the formation of a certain particle size distribution, increasing its hydration area, accelerate the hydration rate, to meet cement paste condensation, hardening requirements.
6 cement packaging
Both bagged and bulk cement factory shipping way.
Address:
No. 20 Yongfeng Road Hi-Tech Industrical Development, Chengdu, Sichuan, China
Business Type:
Manufacturer/Factory, Trading Company
Business Range:
Construction & Decoration, Industrial Equipment & Components, Manufacturing & Processing Machinery, Service, Tools & Hardware
Management System Certification:
ISO 9001
Company Introduction:
SiChuan Mingchuan Chengyu Electrical & Mechanical Co., Ltd. is a professional enterprise which specializing in design, installation, and provides the complete set of cement equipment line in the field of machinery material. It is located by the scenic Tianfu River, the eastern part of Chengdu City, Sichuan Province.
With a healthy govern system and reasonable section structure, with the advantage of Overseas Trading Department(OTD) and Projects Management Department(PMD), SiChuan Mingchuan Chengyu Electrical & Mechanical Co., Ltd. Has focused on developing South-East Asia, Central Asia, the Middle East, Africa and other regional markets. We have a group of senior engineers, researchers, senior economists, well-known technicians and outstanding graduates from Class-A design institute, scientific research institute, electrical and mechanical equipment manufacture, large-scale cement production enterprises, large-scale industrial construction companies, who have been engaging in design, scientific research, equipment manufacture and installation. They have professional skills, high qualities, strong external communication skills, which provides the powerful guarantee for our business development.
CMCC "REPCT" ADVANTAGE
CMCC provide a one-stop service with complete system solutions for cement project. We created the "REPCT" concept in cement project execution and get many praises from the oversea partners:
REPCT concept
Research: Refined plant site research and feasibility study
Engineer: Professional engineering and designing
Procurement: High performance-price ratio and lower TCO equipments solutions with advanced technology
Construction: Prompt and Safe constructions
Training: Personal 24-hours field service and experienced management assistance
