Coal Pneumatic Grading Machine Unit

Product Description: 1, Principles and characteristics of Coal air classifier unit of Ningbo University, Dr. Yang Guohua R & D innovation technology and products. It consists of vibrating fluidized bed classifier (VFB), fine-grained separators, cyclone dust collector, circulating fans, bag filter, induced draft fan and pipe so on. Shown in Figure 1, its working principle is: coal, to join the vibration of a continuous fluidized-bed classifier, in the vibrating force and air force under the effect of particle writhed up and down, so that together, coal group bonded quickly dispersed, stick in the lump coal Fast off the surface of pulverized coal, lump coal and the full separation of fine particles which brought out by the fine-grained with the air separator and dust collector to collect a sieving machine is equivalent to the next screen products; coarse particles from the classifier entry material side of the cloth along the vibrating air board is expected to quickly move out of side discharge, and become the equivalent sieve screening machine products. Features: 1), there is no obstruction of sieve, grading granularity is small, can be screening machines can not do 3mm, 2mm, 1mm or 0.5 mm grade and so on. 2), coal, water adaptability is better off powder and high efficiency. Coal external water 7 to 10%, for 3mm or 2mm grading, de-powder efficiency of up to 80 90%; coal external water 5 7%, to 1mm or 0.5 mm grade when the powder off the efficiency of up to 80 90%. 2, the main purpose 2.1 The pre-wash off the coal preparation plant powder Some coal is less than a certain size (eg less than 3 mm) of fine fly ash points lower, air classifier technology can be used to wash them from the raw coal into the separate, direct sales for low-quality coal ash, or mixed into the washed coal, so that on the one hand into the washing significantly reduce the amount of washing to reduce costs, while also reducing coal moisture; the other hand, can greatly reduce the amount of slime, economic efficiency has been remarkable. For example, a jig into the feed size of 50 0 mm, coal ash Ad = 19.08%, coal ash control 15% less than less than 3 mm into the fine coal washing in coal accounted for 56.33%, ash Ad = 14.23% use of coal, air classifier technology to grain size of less than 3mm in the selected pre-separated, which is less than 13.0% ash Ad can be directly or mixed with washed coal, so that washing can reduce the income of about 50%, significantly lower costs and coal washing water, a huge economic benefit. 2.2 The coal preparation plant before washing off mud Some coal is less than 0.5 mm of the large amount of slime, all into the wash, slurry handling system complexity, high cost of washing. Using air classifier units to less than 0.5 mm into the wash before the separation of slime out to dry pulverized coal direct sales, or mixed with the coal sales, if its low ash content can also be mixed with the coal sales, this would significantly reduce the wet slime volume, reduce the slime treatment burden and improve the recovery of the amount of slime, with significant economic benefits. For example, a self-medium coal preparation machine roller screw into the compound is less than 0.5 mm accounted for 21.6% Coal ash Ad = 17.85%, due to lack of capacity slime processing systems often fail, affecting continuous production, using coal, air classifier unit to less than 0.5 mm into the wash before the slurry in the separation, so that benefits available to the following three areas: 1) reduce the load of coal sludge treatment system, to eliminate slime treatment system failure caused by pressure to cut losses; 2 ) to increase the amount of selected coal to improve coal production; 3) classification to be mixed with dry coal slime sales, increase revenue slime. 2.3 The screening workshop, blending field, such as coal coking plant classification Some coal is not coal preparation plant, but the raw coal in less than a certain size (eg less than 3 mm) of fine fly ash sub-low, high heat value, if a mine is less than 3 mm fine points of fly ash was only 11%, So, if the addition of a screening plant, using coal gas power generating units to these low-grade fine coal ash separate, direct injection for blast furnace of a fuel or high-quality coal sold, economic efficiency has been remarkable. In addition, it can be used for blending field, coking plants. 3, application performance Coal air classifier has already been in a number of enterprise applications, the main application of results are as follows: 1,2000 annual handling capacity of a 100 tons / hour of coal air classifier unit da'anshan Coal Mining Administration in Beijing, the application main purpose is the removal of coal-0.125mm, coal accounted for in the pulverized coal-0.125mm 14%, when the raw coal external moisture was 6%, the off-0.125mm after the pulverized coal powder content reduced to below 3%, to meet the quality requirements of export coal, when a net increase of 33 million yuan economic benefit. 2,2001 annual handling capacity of a set of 15 tons / hour of coal air classifier unit fertilizer plant in Jiangsu Xinyi coal gas plant applications, grading granularity of 3mm, less than 3mm pulverized coal gas production, greater than 3mm for the fluidized bed gasifier of coal particles. 3,2002 annual handling capacity of a set of 50 tons / hour of coal air classifier unit in Shanxi Yangcheng Coal Mine application, is used to anthracite classification into different size fractions of water treatment filter. 4,2005 annual handling capacity of a 200 tons / hour of coal air classifier unit in the village Cheng Coal Mine application of m, grading size of 1mm, coal moisture was 6 7%, the extraction rate of up to 82% off 86%, de-mud rate of 88% to 92%, solve the pulverized coal to the Group's large and easy to clay with water, can not be wet-washing problem. Equipment layout shown in Figure 2. 4, unit specifications, installed power, area 4.1 Unit Specifications Coal air classifier unit for non-standard equipment, the so-called unit specifications, mainly refers to the unit's processing power, unit processing capacity of 50t / h, 100t / h, 150t / h, 200t / h, 250t / h, 300t / h , 350t / h, 400 t / h and so on. 4.2 Units Installed Power As a result of coal quality data users (such as the grain size composition, moisture, etc.) different from each user's specific requirements on the classification (such as the purpose of grading operations, grading granularity) different even within a single specification units, unit configuration there is also a big difference, installed power generating units will be very different. Generally speaking, 100t / h unit, power unit installed 100KW-180 KW; 200t / h unit, power unit installed 200KW-360 KW, other and so on. When the coal moisture is small, take a small value of installed power generating units. 4.3 area As mentioned earlier, the same specifications of the units, unit configuration are quite different, unit layout is a result of on-site space conditions differ, therefore, the same specifications of the unit covering an area of not the same. Generally speaking, 100t / h units, covering an area of 12m × 12m; 200t / h units, covering an area of 20m × 20m, others and so on. Entire unit can be an open-air layout.