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1. Change in the angle of the bowl and bowl, and the size of the bowl. The bowl angle of the bowl and bowl should be greater than the angle of repose of the material by 5° to 10°. The angles of the bowl and bowl in the upper and lower parts are designed and generally dried. The upper part of the machine is 10° to 20° larger than the lower part. For materials with strong adhesion and large initial moisture, the bottom dip angle should be larger when the material is in the form of powder particles, which is conducive to blanking. Conversely, the material has good flowability, less initial moisture, and the bottom dip angle should be smaller when the material is agglomerated. Delay the feeding speed and enhance the drying effect. For example, for a material with an angle of repose greater than 45° and a Carl mobility index of 79, the bottom dip angle should be greater than 60°. According to the particle size, nature and initial moisture content of the drying material, determine the size of the quilting and the area of ​​the boring hole. In general, when drying clay, sand materials. The boring hole size is 20-25mm and the boring area is 33.75cm2. When the slag and iron slag materials are dried, the boring hole size is 15-18mm and the boring hole area is 19.8cm2. When the gypsum powder and coal ash type materials are dried, The hole size is 8-12mm and the hole area is 10.5cm2. For viscous materials, according to the size of the viscous and the final moisture requirements, the size of the boring holes for the upper and lower bowls and cones shall be divided into 2 to 3 groups of different designs, adopting the principle of “decreasing from large to largeâ€. To ensure the drying effect, while ensuring the strength of the heat-resistant alloy castings, the area of ​​the boring hole should be increased as much as possible to reduce the internal resistance of the vertical dryer.
Second, the bowl, cone cone group spacing In order to increase the frequency of material and hot gas pulse exchange, improve the dryer thermal efficiency and production capacity, in ensuring that the material in the smooth material flow, airflow resistance is reasonable under the premise of reducing the group distance as much as possible. Drying in pre-tropics is due to the fact that the material is relatively wet and the flow of material is poor. Therefore, the design angles of the bowls and cones are larger, the lengths are longer, and the group distance is the largest; the materials of the drying belts are relatively dry and have good fluidity. Material exchange frequency, so design group spacing is minimal. When drying clay, stone and other agglomerate materials, the group spacing is 2.0m; when drying powder materials such as gypsum and iron powder, the group spacing is 2.13m; the group distance of electric flowers should be longer than ordinary 300 ~400mm.
Third, the electric flow device configuration and function The function of the electric flow device is mainly through the vibration frequency to control the material flow rate in the dryer. Material from top to bottom under the acceleration of gravity, the instantaneous speed accelerates to increase, in order to extend the residence time of the material in the dryer, according to different materials and drying capacity, sometimes in the upper, upper middle or upper and lower parts of the electric flow In order to control the material flow rate and reduce the instantaneous speed of the material, the electric flow device installed in the upper part must be equipped with a more powerful electric flow device to increase the material excitation force, and at the same time increase the size of the boring hole to prevent the material from clogging; The electric flow meter is configured to retain the material and reduce the instantaneous speed of the material.
Fourth, a reasonable process configuration selection 1. Mechanical ventilation and natural ventilation options. Mechanical ventilation has the advantages of forced ventilation and increased output; natural ventilation has the advantages of simplicity and applicability, but the air volume is not adjustable and the production capacity is limited. When the moisture content of the material is less than 15%, the dust content of the exhaust is not large, and the drying machine barrel is below 14m, the ventilation chimney can be added to the top of the dryer for natural ventilation; when the moisture of the material is greater than 15%, the dryer Simplified more than 14m, increase the induced draft fan and dust removal equipment to enhance the exhaust gas in the dryer.
2. Dust collector selection. When the gas contains a small amount of dust, such as drying lumps or granular materials, a simple bag filter can be directly selected; when the gas contains a large amount of dust, such as drying fly ash, gypsum powder, iron powder, quartz sand, When the material density is large, it can be pre-dedusted with a cyclone precipitator and then dust-removed with a KBD high-efficiency anti-condensation electrostatic precipitator. For dusty gas discharge requirements, KDMC air box pulse bag filter can be selected.
3. The setting of the secondary air duct. The general vertical dryer is a countercurrent process flow, which has the advantages of low dust content in flue gas, high heat exchange efficiency, and simple process flow. At the same time, the counter flow configuration has the gas upwards and the material downwards, and the gas flow rate can slow down the material flow rate when the gas rises. The role, especially for the drying of granular materials, has its advantages, especially when drying materials with high water content. The high-temperature flue gas is introduced into the middle of the dryer. Since the high-temperature hot gas is in direct contact with the wet material, the moisture on the surface of the material is easy to evaporate, the adhesion is reduced, and the movement of the material is facilitated. When the wet coal is dried, direct contact of the hot gas can be avoided. Pulverized coal caught fire. Therefore, for the drying of viscous materials with large moisture content, the process of configuring the secondary hot air duct in the middle must be adopted.
4. The choice of hot blast stove. According to the type of coal, dryer height, material moisture and other comprehensive considerations. 1 If coal is a high-quality bituminous coal, pulverized coal stoves or hand-fired furnaces should be used; 2 If the coal is anthracite, boiling furnaces or hand-fired furnaces should be used; 3 vertical dryers should have a height of ≥ 18m, preferably coal-fired boilers, but Can not conflict with 12; 4 boilers generally use bituminous coal and anthracite, but require coal to control the heat between 12540 ~ 16720kJ, particle size below 10mm, water below 5%, pulverized coal fired coal for high quality bituminous coal and It must be powdered and dry; hand-fired furnaces are suitable for the combustion of coal with bituminous coal and anthracite having a particle size of <60mm. All kinds of furnaces have their own characteristics, coal consumption is also a big difference, the choice should be comprehensively considered.
V. Practical application General manager of Inner Mongolia Baotou Quanshan Cement Co., Ltd. Sun Fuquan said that the company had ordered one KBH2090 high-efficiency vertical dryer and KBF2 double hearth multi-duct high-temperature boiling stove for drying in late December 2001. Dry clay and slag were installed and commissioned in February 2002. At the time of the commissioning process, the technicians at Cobb provided not only on-site demonstrations but also lectures. The relevant personnel of our company quickly grasped the essentials and precautions. The equipment has been operating for two years. There was no quality problem, the drying capacity exceeded the contracted index, and coal consumption and electricity consumption were lower than the contracted indicators.
According to Liao Zhenzhong, chief engineer of Guangdong Jianhua Pipe Pile Group, the output value of our company in the first half of this year was more than RMB 1 billion, and the main product was pipe piles. The raw material in the production process was sand and sand, because of the large amount of moisture needed to dry grinding, from 2002. Since the second half of the year, the company's subsidiaries have ordered Cobb's drying equipment eight times in total, without any blockage and other quality problems. Our company is very satisfied with the selection of such suppliers as Cobb.
Hebei Chengde Detian Building Material Co., Ltd., Shanghai Haishu Building Material Co., Ltd., Sichuan Shuangma Cement Group Co., Ltd., Tangshan Lanbo New Material Co., Ltd., Sichuan Xide County Dage Building Material Co., Ltd., Jiangxi Xinyu Iron & Steel Co., Ltd., and Harbin Jiang More than 500 users, including Gull Special Cement Factory and Cangzhou Xinsanhe Concrete Components Co., Ltd., have reported significant results.
High efficiency vertical drying system design and application
KBH high-efficiency vertical dryer is a kind of newest drying equipment for material from top to bottom and hot air from the bottom up to counter-current heat exchange. It is mainly composed of a barrel, multiple sets of bowls, cones, thermometers, and moisture meters. , smart level meter and other components. The drying system is composed of hot air furnace, dust collector, bucket elevator or belt conveyor, etc. It has the characteristics of adapting to the drying of various materials and good drying effect. It is equipped with Jiangsu Yancheng Kebao Building Material Environmental Protection Equipment Co., Ltd. Intellectual property rights are the only drying equipment that has passed provincial-level scientific and technological achievements, provincial-level new product appraisal, and provincial high-tech product certification. KBH High-efficiency vertical drying systems and rotary drying systems have significant technical and economic indicators such as electricity consumption, coal consumption, production, thermal efficiency, total investment and floor space, etc., all of which have significant production increase, energy saving, low consumption and investment. With practical effects and application values ​​such as the province, the thermal efficiency is as high as 90%, and its development momentum is prosperous at home and abroad. According to different conditions of materials and user requirements, special attention should be paid to the following points in the design and application, in order to give full play to the advantages of an efficient vertical drying system.