The sedimentation filter centrifuge is a new type of high-efficiency fine-grain coal dewatering equipment. It is mainly used for dewatering of flotation clean coal and flotation tail coal in coal preparation plants. In recent years, due to the development of new technologies for slime heavy media, there is an urgent need for dewatering equipment that is compatible with it. The wLGgoox1800A sedimentation filter centrifuge designed by the Tangshan Branch of the Coal Science Research Institute was installed and used in the Longhu Coal Preparation Plant of Qitaihe Mining Co., Ltd. in April 2006. The first time the coal mud heavy medium cyclone was sorted out. Dewatering of clean coal products. More than two years of production practice has proved that the equipment is reliable in operation, large in processing capacity, and the product moisture is 14% to 16%, which plays an important role in reducing the moisture of the coal in the coal preparation plant.
1. Equipment System Longhu Coal Preparation Plant is a mine-type coking coal preparation plant with an annual processing capacity of 1.2 million tons of raw coal and coking coal. The coal preparation method adopts the more advanced full-weight medium coal preparation process in China. Because the coal quality of the original coal is relatively soft, the content of the final coal is large, and the amount of primary coal and secondary coal in a 0.5mm grade accounts for about 45% of the raw coal. This causes great difficulties in the dewatering and recovery of the slime water system and products. . In order to ensure that the moisture of the finished fine coal product of Zui is less than 12%, it is especially necessary to reduce the moisture of fine coal. To this end, the plant selected the WLG900x1800A sedimentation filter centrifuge for the dewatering of fine-grained coal. The main technical characteristics of the machine are shown in Table 1.
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In order to make the sedimentation filter centrifuge operate reliably and achieve the required dewatering process index, the equipment has been further improved in design: 1 The planetary gear differential has been redesigned, and the lubrication method has been changed from the original oil pool lubrication to the circulating oil. Forced lubrication; 2Adjusted the spiral lead of the pusher and the slip between the pusher screw and the drum; 3The new wearable material of alumina ceramic wear-resistant material is selected for the easy-wearing parts such as the screen, the outer edge of the screw and the discharge opening. Manufacturing or protection; 4 perfected the electrical control system, the amount of manpower can be adjusted according to the value detected by the push torque meter.
2. Production application In order to obtain the effect of centrifuge dewatering and fine-grained clean coal according to 0.075mm classification, the experiment was carried out several times under the condition of changing the mechanical parameters and process conditions of the centrifuge. The process effect of the centrifuge is shown in Table 2. The results of small coal sieving are shown in Table 3.
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It can be seen from the test results that the centrifuge has a large concentration of human material, a coarse particle size, a small content of fine particles (-0.075 mm), and is easy to dehydrate. When the centrifuge speed drops to 630r/min, the product moisture can be reduced to 14.65%. This is because although the centrifuge speed is reduced, the dehydration time is relatively extended, which ensures sufficient dehydration time. The reduction of the speed of the centrifuge reduces the pushing torque, reduces the load of the reducer, saves power consumption, reduces the friction and wear of the equipment, prolongs the service life of the wearing parts, and brings a series of benefits to the operation of the equipment. . Therefore, Zui finally determined that the production speed of the equipment was 630 r/min. According to the test results, when the concentration of human material is 467g/L, the processing capacity of the centrifuge is Q=10.25t/h. At this time, the main motor power N=52.70kw, which is much lower than the rated power, indicating that the processing capacity of the machine has a large surplus. It can reach the upper limit of 20 rated h of the rated processing capacity of the equipment. It can be seen from the small sieve results of the coal sample that the effect of the machine on the fine-grained grade of 0.075 mm is not obvious, and all the centrates are -0.045 mm grade fine mud.
3 use effect (l) centrifuge for better dewatering of fine coal slurry. Compared with other slime recovery equipment, WLG900x1800A centrifuge has small volume, low product moisture (can be reduced to 14%-16%), and the single-machine processing capacity is large, which ensures the requirements of the process system for product moisture index.
(2) When the centrifuge doubles as a fine-grained (-0.O75mm) classification equipment, the classification effect is not obvious. It can be seen from the small sieve results of coal samples that the high-ash fine mud content of -0.075mm is the main factor affecting the index of clean coal ash. If these high-ash fine muds are discharged from the centrate, it will undoubtedly further reduce the fineness. Ash of coal slime products. In the human fine coal slurry, the content of -0.075mm is about 20%. According to the condition that the centrifuge liquid discharged by the test is all -0.045mm grade, the purpose of classification according to 0.075mm is not achieved. Despite this, the product ash was reduced from 19.14% to 13.99%. If the -0.075mm high-ash fine mud in the product can be separated from the centrifugal liquid, the ash content of the fine coal slurry product can be reduced to 8.96%. In order to achieve this, it is necessary to further reduce the centrifugal strength of the device or shorten the length-to-diameter ratio of the drum.
(3) Equipment operation reliability is high. Because the machine has improved the material and structure design of the wearing parts, the reliability of the equipment operation is greatly improved. After more than 2 years of operation, none of the components were damaged, and the problems of spiral and screen wear and differential damage that have been plaguing such equipment have been effectively solved, indicating that the improved design is successful and new in the reliability of the equipment. breakthrough.
4 Conclusion WLG900x1800A sedimentation filter centrifuge is suitable for the dewatering of fine-grained coal. Compared with vacuum filter, it has strong adaptability, large processing capacity, low product moisture, low energy consumption, no auxiliary equipment and small floor space. Advantages, in the case of suitable process conditions, can also replace high-frequency sieves, used to reduce the moisture of crude slime products and improve the yield of clean coal. Since the single processing capacity of the device is large, the number of devices used can be reduced, the plant area can be saved, and production management can be facilitated.
1. Equipment System Longhu Coal Preparation Plant is a mine-type coking coal preparation plant with an annual processing capacity of 1.2 million tons of raw coal and coking coal. The coal preparation method adopts the more advanced full-weight medium coal preparation process in China. Because the coal quality of the original coal is relatively soft, the content of the final coal is large, and the amount of primary coal and secondary coal in a 0.5mm grade accounts for about 45% of the raw coal. This causes great difficulties in the dewatering and recovery of the slime water system and products. . In order to ensure that the moisture of the finished fine coal product of Zui is less than 12%, it is especially necessary to reduce the moisture of fine coal. To this end, the plant selected the WLG900x1800A sedimentation filter centrifuge for the dewatering of fine-grained coal. The main technical characteristics of the machine are shown in Table 1.
In order to make the sedimentation filter centrifuge operate reliably and achieve the required dewatering process index, the equipment has been further improved in design: 1 The planetary gear differential has been redesigned, and the lubrication method has been changed from the original oil pool lubrication to the circulating oil. Forced lubrication; 2Adjusted the spiral lead of the pusher and the slip between the pusher screw and the drum; 3The new wearable material of alumina ceramic wear-resistant material is selected for the easy-wearing parts such as the screen, the outer edge of the screw and the discharge opening. Manufacturing or protection; 4 perfected the electrical control system, the amount of manpower can be adjusted according to the value detected by the push torque meter.
2. Production application In order to obtain the effect of centrifuge dewatering and fine-grained clean coal according to 0.075mm classification, the experiment was carried out several times under the condition of changing the mechanical parameters and process conditions of the centrifuge. The process effect of the centrifuge is shown in Table 2. The results of small coal sieving are shown in Table 3.
It can be seen from the test results that the centrifuge has a large concentration of human material, a coarse particle size, a small content of fine particles (-0.075 mm), and is easy to dehydrate. When the centrifuge speed drops to 630r/min, the product moisture can be reduced to 14.65%. This is because although the centrifuge speed is reduced, the dehydration time is relatively extended, which ensures sufficient dehydration time. The reduction of the speed of the centrifuge reduces the pushing torque, reduces the load of the reducer, saves power consumption, reduces the friction and wear of the equipment, prolongs the service life of the wearing parts, and brings a series of benefits to the operation of the equipment. . Therefore, Zui finally determined that the production speed of the equipment was 630 r/min. According to the test results, when the concentration of human material is 467g/L, the processing capacity of the centrifuge is Q=10.25t/h. At this time, the main motor power N=52.70kw, which is much lower than the rated power, indicating that the processing capacity of the machine has a large surplus. It can reach the upper limit of 20 rated h of the rated processing capacity of the equipment. It can be seen from the small sieve results of the coal sample that the effect of the machine on the fine-grained grade of 0.075 mm is not obvious, and all the centrates are -0.045 mm grade fine mud.
3 use effect (l) centrifuge for better dewatering of fine coal slurry. Compared with other slime recovery equipment, WLG900x1800A centrifuge has small volume, low product moisture (can be reduced to 14%-16%), and the single-machine processing capacity is large, which ensures the requirements of the process system for product moisture index.
(2) When the centrifuge doubles as a fine-grained (-0.O75mm) classification equipment, the classification effect is not obvious. It can be seen from the small sieve results of coal samples that the high-ash fine mud content of -0.075mm is the main factor affecting the index of clean coal ash. If these high-ash fine muds are discharged from the centrate, it will undoubtedly further reduce the fineness. Ash of coal slime products. In the human fine coal slurry, the content of -0.075mm is about 20%. According to the condition that the centrifuge liquid discharged by the test is all -0.045mm grade, the purpose of classification according to 0.075mm is not achieved. Despite this, the product ash was reduced from 19.14% to 13.99%. If the -0.075mm high-ash fine mud in the product can be separated from the centrifugal liquid, the ash content of the fine coal slurry product can be reduced to 8.96%. In order to achieve this, it is necessary to further reduce the centrifugal strength of the device or shorten the length-to-diameter ratio of the drum.
(3) Equipment operation reliability is high. Because the machine has improved the material and structure design of the wearing parts, the reliability of the equipment operation is greatly improved. After more than 2 years of operation, none of the components were damaged, and the problems of spiral and screen wear and differential damage that have been plaguing such equipment have been effectively solved, indicating that the improved design is successful and new in the reliability of the equipment. breakthrough.
4 Conclusion WLG900x1800A sedimentation filter centrifuge is suitable for the dewatering of fine-grained coal. Compared with vacuum filter, it has strong adaptability, large processing capacity, low product moisture, low energy consumption, no auxiliary equipment and small floor space. Advantages, in the case of suitable process conditions, can also replace high-frequency sieves, used to reduce the moisture of crude slime products and improve the yield of clean coal. Since the single processing capacity of the device is large, the number of devices used can be reduced, the plant area can be saved, and production management can be facilitated.
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