1. broken and pre-homogenization
(1) broken cement production process, most of the material to be broken, such as limestone, clay, iron ore and coal. Limestone is the largest amount of raw materials, cement production, mining the particle size after the large, high hardness, so the broken limestone crushing the material in the cement plant occupies a more important position.
(2) raw materials are pre-averaging technique is pre-existence of raw materials, take the process of applying scientific stacker technology, the initial raw materials are of the raw material yard with storage and are of the same features.2.raw material preparationCement production process, to produce 1 ton of Portland cement grinding at least 3 tons of materials (including 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 whole plant over power, of which 30% of raw material grinding more than about 3% of total coal mill, cement grinding about 40%. Therefore, a reasonable choice grinding equipment and processes, optimize the process parameters, proper operation, control operation system for ensuring product quality, reduce energy consumption is of great significance.
Dry cement production process, raw material composition is stable pit entry clinker thermal system stability the prerequisite, the system plays a raw meal of raw ingredients stability of pit entry last gatekeepers.
Preheating the raw material and parts to complete decomposition of the pre-heater, replace the rotary part of the function, to shorten the length back to the kiln, while the accumulation of the state of the kiln to heat the process gas feed, move to the inner suspension preheater , which will give the raw material can be discharged with the kiln hot gas mixing, increasing the material contact area of gas, heat, fast heat exchange efficiency, to improve the kiln system productivity, reduce heat consumption of clinker purposes.
80% of heat pipes carried out at the entrance. In the preheater tube feeding raw material, increased airflow with high-speed impact, the material turned off with the flow on the movement, while being dispersed.
When carrying material powder into the air after the cyclone, cyclone cylinder and forced to the inner cylinder (exhaust pipe) to do within the annular space between the rotating flow, and the side of the rotating side of the downward movement from the cylinder to the cone, has been able to extend to the end of the cone, and then turned up on the rotation, the exhaust pipe.
Decomposition technique is the emergence of pre-calcination process of cement a technology leap. It is added between the preheater and rotary kiln calciner and the increased use of flue, set the fuel injected into the device so that the exothermic fuel combustion process and raw materials endothermic decomposition of carbonate, in the calciner or suspended within the flow of state quickly, so that the decomposition into the kiln feed rate to 90%. Within the original carbonate in the decomposition of rotary task, move the calciner; fuel from the calciner to join the majority, joined a small part of the kiln, the kiln burning zone to reduce heat load, extended liner life, is conducive to large-scale production; the mixed fuel and raw materials, timely delivery of fuel combustion heat to the material, the combustion, heat transfer and carbonate decomposition process can be optimized. Thus has a high quality, high efficiency, low consumption and a series of excellent performance and features.
clinkerRaw material for completion in the cyclone preheater preheating and pre-decomposition, the next process is carried out into the rotary kiln clinker.In the rotary kiln for further rapid decomposition of carbonate and a series of solid-phase reaction of the cement clinker and other minerals. With the temperature near the material, the other minerals will become liquid, dissolved in the liquid phase and the reaction generates a large number (clinker). Clinker, the temperature started to fall. Finally, the cement clinker cooler to clinker kiln cooling of high temperature discharged to the downstream transport, store and cement mill can withstand the temperature, while high-temperature clinker sensible heat recovery, improve thermal efficiency and clinker quality.
Cement manufacturing cement grinding is the final process, but also power most of the process. Its main function is to cement clinker (and gelling agent, performance tuning materials, etc.) grinding to the appropriate size (in fineness, specific surface area, said), a certain particle size distribution, increasing the size of its hydration accelerate the hydration rate of cement paste to meet the coagulation, hardening requirements.
Bagged and bulk cement factory has shipped both ways.
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