For the original ball-grinding process system with drying and grinding raw materials, it is necessary to continuously optimize the system process parameters and technical transformation to save electricity, such as continuously optimizing the grinding machine ball grading scheme, such as grinding body loading, filling rate, The shape of the partition plate and the lining plate to reduce the power consumption, the limestone particle size should be reduced as much as possible, the width of the limestone crusher discharge port should be adjusted, and the limestone particle size should be controlled below ≤5mm to reduce the ball mill grinding load and Pressure, reduce the average ball diameter of a warehouse, increase the number of small balls, and improve the overall grinding efficiency of the ball mill. Optimize the process parameters of the high-efficiency classifier for system ventilation and separation of coarse and fine powders, select the fine powder into the warehouse in time, and grind the coarse-grained head in time to grind and grind, improve the powder selection efficiency of the classifier and reduce the classifier The cyclic load is of great significance for the power saving of the grinding system. The dust collecting efficiency of the dust collector is improved. The bag dust collector is used to replace the original electric dust collector. The dust emission concentration is less than 50mg for environmental protection. The national standard of BM3 is of great significance. Power saving technology approach for precalcining kiln cement grinding system In the process design of the cement grinding system of the precalcining kiln cement plant, the extrusion grinding process system such as pre-grinding with roller press, combined grinding, semi-finish grinding and final grinding is used as much as possible. Grinding process and equipment, no longer choose the old ball mill plus the selection process system, can greatly reduce the total power consumption of material grinding. Since the energy utilization rate of the ball mill is very low, the effective work of grinding is only 2% to 5% of the total energy supplied to the mill. Most of the energy is not actually used for crushing the material, and the extrusion roller press is Ball mill grinding is completely different. Since the material is fed into the extrusion mill and is brought between the two rolls under the relative movement of the two rolls, the grinding roller exerts a strong pressure on the material bed, at which time the material is completely pulverized by the high pressure to form a sheet cake to be unloaded. Out, during the whole extrusion process, the material is closed in a small space by two rolls and two partitions at both ends, there is no possibility of escape, the particles and particles are gradually compacted, forming inter-layer extrusion, and there is little kinetic energy. Loss and waste are caused by the conversion of heat energy, which greatly reduces the loss of crushing work and improves the utilization of input energy. The mechanical efficiency of laminating pulverization is also superior to that of conventional ball milling machines, because in the ball mill, because the steel ball impacts the material, friction between the particles and the material layer consumes a lot of energy, plus When the steel ball is impacted, the contact area is not closed, the lamination conditions are not sufficient, the "splash energy" of the crushed material is greatly lost, and the qualified fine powder sometimes cannot be eliminated in time, resulting in the phenomenon of so-called "over-grinding", some difficult-to-grind particles The "negative grinding" effect, excessive fine particles due to "crystal pulverization" has an electrostatic adsorption effect, resulting in a "sticky ball" phenomenon, greatly reducing the grinding efficiency. Extrusion grinding is the pulverization of all the particles, so it can be carried out under the conditions of industrial large-scale capability. According to relevant research, the energy consumption of extrusion pulverization is about 10kWh/t~13.5kWh/t, which is about The ball mill pulverizes about 1/3 of the energy consumption. The whole roller mill can be used as a pre-grinding or combined grinding system for cement ball mill systems to save 24% to 35% compared to a single ball mill system. The old cement ball mill crushing system that has been completed and put into production should be continuously technically modified to optimize the process flow and production operation parameters to achieve high quality and high production and save electricity consumption. The main measures are: "Multi-less grinding broken" using pre-crushing mill crushing machine into the clinker and gypsum admixture of finely divided into fine particles - of about 3mm 5mm, to replace a cartridge pre-mill crushing function and reduce crushing load pressure of a bin mill And increase the grinding efficiency of the grinding body in the first and subsequent positions of the ball mill, reduce the average ball diameter, and increase the number of small grinding bodies. Professor Schneider of Germany has studied the energy utilization efficiency of various crushers and mills. The conclusion is that the energy consumption rate of various crushing machines can reach 40%, and the roller crusher can be as high as 70% or more. The energy utilization rate is only 3%~5%. Therefore, the technology of “breaking more and less grinding†is a very effective technical measure for energy saving and production increase of the old cement ball mill circulation and open flow system. Generally, the hammer type, the rotary type and the cone are used. The crusher is good for finely crushing cement clinker and mixed materials. In addition, it can also invest in roller mill roller, as well as vibrating fine crushing, vertical impact crushing and column grinding. Rod mill can also be used as material equipment. Obtain the effect of energy saving and increase production of cement mill. For the original open-flow cement pipe grinding system, it can be technically transformed into a high-fine-high-yield screening mill or a process system with a high-efficiency classifier with a circulating flow belt, which can greatly increase the production and save electricity: transform into a high-fine and high-yield screening mill. Due to the use of double-layer compartment boards between the high-fine and high-yield grinding chambers, the pupil width and distribution form are targeted to the grinding material and product fineness, and the double-layer compartment board between the ball bin and the segment bin is added. The screening device with the function of separating coarse particles can block the large particles to reach the set particle size and then enter the segment bin. In addition, since the micro-section is used as the grinding body, the average ball diameter of the ball bin can be greatly reduced, and the micro-grinding By increasing the surface area, the body fully utilizes its pulverization efficiency, effectively reducing the excessive stress applied to the mill by the large ball, and the activation of the liner can eliminate and inhibit the "stagnation zone" of the mill, especially the large-diameter mill. The effect, so its energy-saving and production-increasing effect is very significant, usually saving more than 30%. The open-flow tube grinding and powder sorting machine is transformed into a grinding process system with a high-efficiency powder sorting machine. Since the high-efficiency powder sorting machine can sort the qualified fine powder in the grinding machine in time, it can effectively overcome the open grinding mills. The phenomenon of “over-crushing†and the phenomenon of ball-Cutter grinding improve the grinding efficiency, so it can save unit power consumption and increase output compared with the open-flow system. In addition, it can optimize the powder selection efficiency and cycle load of the classifier, as well as timely Adjust the plan of the ball grading and loading of the mill to achieve the purpose of energy saving and increase the specific surface area of ​​the cement. Due to the low energy utilization rate of the cement mill, most of the heat is transferred to the cement material fine powder and air in the form of heat energy. Therefore, the cement grinding cement temperature of most cement enterprises is above 100 degrees Celsius, which affects the quality of cement and The quality of concrete construction (mainly manifested by the dehydration of gypsum in the cement mill affecting the setting time and strength. The cement warehouse is easy to block due to the large amount of water vapor. During concrete construction, especially when the mass concrete is constructed, the cement powder temperature is too high ≥ 80 °C. ~100 degrees Celsius, causing the cement hydration temperature rise too high, affecting the thermal expansion of the concrete and cracking), therefore it is necessary to take cooling measures for the cement grinding system and technical transformation of the cement conveying warehousing system from the original warehouse pump and spiral The pump tube is sent to the warehouse for transformation into a belt conveyor plus hoist storage or air transport chute plus hoist storage, which not only plays a role in cooling the cement, but also can greatly reduce the energy consumption of cement grinding cement transportation, which can generate electricity saving. The effect is that the electricity consumption per ton of cement can reach 2kWh/t~4kWh/t. Technical precalciner saving coal preparation system kiln dust route The precalciner pulverized coal preparation system is usually in the form of a wind sweeping system, which is mainly composed of a mill, a coarse powder and a fine powder separator, or a dust collector common to the kiln, and the input, output, lifting, and powder selection of the materials in the mill. All are completed by pneumatic force, no need to select powder machine and hoist, the system is relatively simple, but its pulverized coal grinding is completed by ball milling, the power consumption is relatively high, and the particle size of pulverized coal preparation is controlled by coarse and fine powder separator, and its classification The precision is limited, especially for most southern cement enterprises, which use low-quality coal and anthracite with low volatile content. On the one hand, the wearability of coal is deteriorated, and the pulverized coal work index is as high as 20 kWh/t~30 kWh/t, on the other hand, pre-decomposition Kiln production requires less fineness of pulverized coal for calcination of inferior coal. Therefore, the contradiction between the demand for fine coal powder in the precalciner kiln and the low production capacity and grinding efficiency of the original wind sweeping coal mill is increasing. Technical transformation of the old-style wind sweeping system, using the coal mill high-efficiency classifier and high-concentration explosion-proof bag dust collector and other technical equipment to replace the traditional coarse and fine powder separator process equipment will become an inevitable trend, increasing production and energy saving effect 30%~ 60%. High-efficiency classifiers have been successfully developed and manufactured in China: NHX type, MDS type, CMS type, etc. The vertical coal mill, such as HRM type, can replace the wind sweep ball mill system, which can save 30%~50% of electricity compared with ordinary wind sweeping, and has wide adaptability to coal types. Bituminous coal, anthracite, sub-bituminous coal and high-ash inferior coal Can be used, its small footprint, low civil construction investment, simple process, low noise, generally ≤85dB, large grinding grain size, maximum lump coal particle size up to 45mm, grinding water up to 15% or more, unit power consumption The 16kWh/t of the wind sweeping system has dropped to 8kWh/t~10kWh/t, which is currently used by the large and medium-sized cement enterprise production lines instead of the wind-swept ball mill to become the first choice for the new energy-saving pulverized coal preparation system of the precalciner kiln system. 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In the pre-decomposition kiln construction, when the process design selects the raw material system process equipment, the energy-saving vertical grinding (ie vertical drying and grinding) is used to replace the old-style ball grinding and grinding, and the power saving effect is better than the ball. The mechanical and electrical consumption of mushrooms is reduced by 20%~40%.