Cement plant design is of paramount importance in the construction industry for several reasons, such as operational efficiency, environmental impact, safety, cost control, product quality, flexibility, sustainability, regulatory compliance, long-term viability.
As a cement plant solution provider, we give some tips for cement plant design, including cement site selection, mineral selection, raw material prehomogenizing, grinding station design, calcination system design, waste gas generating system design, electrical automation system design, etc.
Site selection
The selection of cement production line site must be reliable, that is, the supply of raw materials should be reliable, the market sales should be reliable, and the past will be a complete cement production line in the same site concept, is slowly becoming clinker, cement project construction, in other words, clinker line close to the mine and grinding station close to the market site idea.
Mine selection and planning
In the cement plant, the selection and planning of mines should focus on considering reliability and environmental protection, in today’s increasingly tight resources, it is not very easy to choose a mine with large reserves and good quality. Therefore, the mine requirements can not be too high; the past pursuits of the same time with large reserves, high calcium, low alkali, uniform stability, easy mining, and other requirements have not been very good to meet. As the cement plant continues to large-scale, with more and more technology, the adaptability of raw materials is becoming stronger and stronger, as long as the harmful ingredients are not too high, grade to meet the basic ingredient requirements. However, mines must make detailed geological explorations, and design a long-term mining plan and resource utilization plan.
Raw material pre-homogenization
In the design of a large cement plant, the raw fuel, especially limestone, is equipped with a pre-homogenization yard, but because limestone has been consciously matched in the mining process, and the daily amount is particularly large, the role of limestone pre-homogenization yard for storage is higher than the homogenization effect. common-used equipment for pre-homogenization includes stacker and reclaimers. Large rotary kilns have a strong adaptability to raw materials, and their sensitivity to homogenization is not as high as that of small rotary kilns.
Selection of raw material grinding system
The design of the raw material grinding system should focus on the energy-saving, vertical mill grinding system because of its power-saving, simple process to become a large cement plant, the use of a ball mill grinding system is no more than two reasons: first, the raw material is difficult to grind, such as high quartz sandstone content, the second is the vertical mill supply cycle is too long, affecting the construction period. However, due to the large power consumption of cement plants, the power saving effect of vertical mills is obvious, so as long as there is little possibility, it is also necessary to use vertical mills.
Burning system of cement rotary kiln
The burning system of a cement rotary kiln is a fundamental component of the cement manufacturing process, where raw materials are heated to extreme temperatures to produce clinker. Its efficiency, temperature control, and environmental considerations are central to the overall performance of a cement plant.
The principle of rotary kiln firing system design should be “, energy saving, environmental protection “, the technology of the firing system is very mature, domestic and foreign design units of the decomposition furnace furnace type is not the same, but the working principle and technical parameters are very close.
At present, cement rotary kiln waste incineration is more popular, that is, the treatment of industrial waste, this treatment does not cause secondary pollution, and is more economical than specially designed a set of waste treatment system, and the processing capacity is very large. Therefore, the design of the sintering system should not only consider “energy saving”, but also the contribution to “environmental protection”.
Cement grinding system design
The design of the cement grinding system is also focused on “energy saving”, because the cement grinding part accounts for about 45% of the electricity consumption in the cement plant. There are many cement grinding system processes to choose from, including open flow grinding, ordinary closed circuit grinding, pre-grinding, combined grinding, final grinding, vertical grinding and so on.
Waste gas generating system
The low-temperature waste heat power generation technology that does not require supplementary combustion has been very mature, which provides a good technical support for the energy-saving design of cement plants. In the past, the exhaust gas generated by the firing system was directly discharged after humidification, cooling and dust collection treatment, and this part of the waste heat was not recycled. With the increasingly tight energy supply, energy saving and emission reduction has become a hot topic, modern cement production line requires synchronous design of waste heat power generation system, so the waste heat power generation system can reflect the concept of “energy saving”.
Electrical automation system
The design of electrical automation mainly considers the principle of “reliable”, now the commissioning of cement projects is mainly to adjust the electrical equipment and the corresponding parameters, there are many factors affecting the operating rate of electrical reasons, so the design idea of electrical automation is first “reliable”, especially the large cement plant, the host can not open and stop. The design index of automation is an important sign of the technical level of a factory. Only by improving the level of automation can we reduce the operating workers, reduce the production cost, improve the safety protection measures of the equipment, and improve the stability of production.
Large cement plant design needs to consider a lot of factors, including reliable, simple, energy saving, environmental protection, the past emphasis on low investment, economic reasonable, short construction cycle, garden factory, functionaland other concepts that are also very important.
