Energy saving and environmental protection cement clinker preparation system

Abstract

The invention discloses an energy-saving and environment-friendly cement clinker preparation system, which includes a raw material preparation system, a raw material homogenization system, a fed raw material conveying system, a cement and pulverized coal preparation system and a cement clinker calcination system, wherein a material outlet of a loading bucket elevator is connected with a material inlet of a raw material homogenization air conveying chute; a material outlet of an unloading chain conveyer is connected with material inlets of two unloading bucket elevators respectively; a material outlet of a raw material feeding spiral conveyer is connected with a material inlet of a preheater; a material outlet of a spiral pneumatic conveying pump is connected with a material inlet of a decomposition furnace; a material outlet of another spiral pneumatic conveying pump is connected with a material inlet of a four-passage pulverized coal combustion device; a hot air outlet of an air-beam type grate cooler is connected with an air inlet of an air-swept coal mill; one material outlet of an electric tee scraper-trough conveyer and a material outlet of a kiln tail dust collection spiral conveyer are both connected with a material inlet of a re-homogenization loading chain conveyer. The system has the advantages as follows: the yield of the clinker is increased, the energy consumption is lowered, the emission is reduced, the quality of the clinker is improved, and the quality of the cement is stable.

Description

Technical field: [0001] The invention relates to an energy-saving and environment-friendly cement clinker preparation system, which belongs to the field of cement clinker production. Background technique: [0002] At present, there is only one raw material mill in the cement raw meal preparation process, and the raw material production capacity is low, which cannot meet the raw material demand of the subsequent cement firing system, making the subsequent system unable to work at full capacity and wasting resources; the measurement accuracy is low, and the raw meal Quality fluctuations occur from time to time, which directly leads to low yield and quality of subsequent clinker; during the feeding process of raw meal powder selection, the feeder is fed with a blanking slide, which is prone to jamming, high failure rate, and affects the stable operation of production ;Centrifugal powder separators are mostly used for powder selection, and centrifugal powder separators have low ...

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Problems solved by technology

[0002] At present, there is only one raw material mill in the cement raw meal preparation process, and the raw material production capacity is low, which cannot meet the raw material demand of the subsequent cement firing system, making the subsequent system unable to work at full capacity and wasting resources; the measurement accuracy is low, and the raw meal Quality fluctuations occur from time to time, which directly leads to low yield and quality of subsequent clinker; during the feeding process of raw meal powder selection, the feeder is fed with a blanking slide, which is prone to jamming, high failure rate, and affects the stable operation of production ;Centrifugal powder separators are mostly used for powder selection, and centrifugal powder separators have low powder selection efficiency and low yield, which leads to a high internal cycle load rate of the raw material mill, which intensifies the power consumption of the raw meal preparation system. Moreover, the centrifugal powder separator cannot meet the requirements of the entire cement production system for the production and quality of cement raw materials; when cement raw materials are homogenized, the storage capacity of the cement raw meal homogenization storage is small, and the homogenization capacity is weak, and most of them can only rely on the warehouse Bottom pneumatic blowing device is used for homogenization, the location of each homogenization warehouse must be consistent, no material circulation can be formed between warehouses, the homogenization method is single, the homogenization effect is poor, and the raw meal composition fluctuates greatly, which seriously affects the subsequent cooking process. The calcination quality of the raw material; but to adopt the scheme of separately transforming the raw meal homogenization warehouse, the investment cost is relatively large, and the transformation period is long; when the material is discharged from the warehouse, there is only one bucket elevator, and the lifting efficiency is low, which cannot meet the requirements of the follow-up system. Supply requirements; the raw meal metering bin has no metering device, so the amount of raw material in the bin cannot be known in time, and it is easy to cause the bin to be full during operation, and in serious cases, it will block the conveying pipeline above the raw meal metering bin; cement clinker In the firing system, the raw coal is ground by air-swept pulverization. The air-swept pulverized coal is provided by the hot blast furnace. The pulverized coal is separated by a cyclone separator. The consumption of raw coal in the furnace is large, and the temperature of the hot air is not well controlled, so there is a certain danger in drying the pulverized coal in the air-sweeping coal mill. If the operation is improper, there is a danger of explosion; the efficiency of powder selection using a cyclone separator is low, and the yield is low. , not only cannot meet the pulverized coal supply of the whole system, but also increases the circulating load rate of pulverized coal in the coal mill system, resulting in high power consumption; During calcination, the pulverized coal has a low burnout degree, and incomplete combustion of pulverized coal is prone to occur, which affects the quality of clinker; if the pulverized coal silo adopts a material level controller, it can only rely on the height of the material layer in the pulverized coal silo to measure the material in the silo The amount, the measurement accuracy is not high, and the calibration and calibration is difficult. When the material level in the warehouse is cut or the vibration causes a high and low slope, the controller can only calculate the material level through the logic formula according to the side in contact with it, and the measurement display volume often It will deviate from the actual amount, and maintenance is more difficult, and the life cycle is short; only one pulverized coal bin is used. When the coal mill or dynamic separator fails and needs to be shut down, the original pulverized coal will be lost during equipment maintenance. When the coal powder in the warehouse is exhausted, the follow-up equipment needs to be shut down; and when the coal powder in the coal powder warehouse fluctuates, the quality of the coal powder is unstable; At this time, the decomposition rate of limestone in the raw meal is low, which increases the burden of calcination in the kiln, and the amount of coal used for calcination in the kiln is relatively large, the output of clinker is low, and the quality fluctuates greatly.

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