摘要：Designed with an annual capacity of three million tons of mine coal preparation plant, length of service for more than 30 years. Washery system of 300 days of work a day, producing a double shift (16 hours), a group of maintenance. Requirements are divided into fine ash 8.3%, coal moisture Mt = 12%, in the coal directly to local power plants, waste ash in between 65% -75%. The equipment provided in process are: jig sorting mainly to deal with overflow flotation, jigging in the coal and coal flotation tail mixed into the power plants, waste shipped to the Waste Dump, block coal jigging dehydration, floating Coal election at the end of filtration and hydraulic flow classification Desliming, dehydration through the belt to the Coal Wharf.
First of all, by the coal industry analysis table, we can see that 2 # coal seam of coal accounted for 40%, 4 # coal seam of coal accounted for 60 percent, through comprehensive analysis of raw data to calculate the composition of screening form, coal floating table, floating data correction.
According to Washability Curve, we can see that coal is easy to coal, coal preparation plant required by jigging coal technology, according to the order of calculation of the various operating processes the quantity, quality, of water. According to the calculation of the quality of the preparation of a coal product ultimate balance and water balance, calculated the results of the final product are as follows: clean coal yield of 39.79%, ash 8.28%, moisture 10.94%; in coal yield of 52.61%, ash 19.50%, 10.8% moisture; gangue yield 7.60%, ash 67.58%, the products meet the required indicators, especially in coal-water is not high, local power stations generating better efficiency, but also the balance of water. Because of the design coal products and water have reached a balance, so the selection of equipment can be carried out and its calculation. According to the results of the calculation process, selection of major equipment and the number of terms, and to calculate the results of the preparation of indicators calculated in the device list.
Operating all over after the completion of the need for auxiliary equipment set aside the width, height and must ensure that the space should be calculated in accordance with the regulations, or look-up table, for the next phase of coal preparation plant layout to provide a basis. In the arrangement of equipment, it is necessary to pay attention to plant and equipment of the beams can not collide, it is necessary to make full use of factory space, we must also consider the question of the floor loading capacity to ensure the integrity of the construction and force uniform, equipment layout as much as possible so that the various operation since the inflow of material, in addition to cope with the plant layout of venues and the main maintenance, sub-channels. Layout is a layer of space utilization is not high, can be arranged control room, office and so on.
The design is based on efficient use of various operating as far as possible gravity, reducing energy consumption, compact space layout reasonable, In addition, as a result of the use of recycled water, sewage discharge less, work more hygienic environment. Generally speaking, throughout the coal preparation system is simple and reliable, cost is also relatively low, the effect of sorting are also very good. Comprehensive recovery, environmental protection, auxiliary equipment, plant design and reasonable structure, so that investment in infrastructure concentrator to maximize benefits.
Abstract: Design that annual one treatment ability is that 3 million tons of shaft choose a coal yard , the length of service is in 30 the above. Choose the coal yard working system job 300 day, every day Class two gives birth to a child (work 16 hours) , Class one examines and repairs. Require that coal ash is 8.3% accurate mark, clean coal moisture content Mt = 12%, middle coal is direct transport to the local power station , gangue ash content are in 65%- between 75%. Process flow stipulated by equipment is: Flotation processes to spring to eliminate selections not giving first place to, flooding , spring to eliminate middle coal entering a power station with flotation tail coal commixture, gangue luck springs to the hillock, to eliminate piece clean coal dehydration , flotation clean coal fliteration and the hydraulic classfication bottom stream take off a mud , dehydration transports to the essence coal bunker by the belt. First, industry analyses the form but the knowledge from raw coal , 2 # coal seams take up raw coal 40%, 4 # coal seams take up raw coal 60%, the data adjustment calculating sieving being composed of the form , raw coal drifting along administering medicine to bring out the cold , drifting along waits by the multianalysis to firsthand information. According to may choose the nature curve but knowing, raw coal belongs to coal easy to elect , adopts to spring to eliminate a handicraft choosing coal according to choosing coal yard call for, according to each school assignment of technological process sequencing computation quantity , mass , water yield. The calculation according to number mass, works out out ultimateness choosing the coal product balancing the form and the water balance form , end item calculation bear fruit is respectively: The clean coal product leads 39.79%, ash content 8.28%, moisture content 10.94%; The middle coal product leads 52.61%, ash content 19.50%, moisture content 10.8%; The gangue product leads 7.60%, ash content 67.58%, every product index reaches especially middle coal moisture content is not high call for, supply station electric power generation beneficial result is on the spot fairly good , the water yield also balances and. The selections type Ji Qi being able to carry out equipment secretly schemes against as designing that the product and the water yield all reach balance originally time choosing coal. According to the result that technological process calculates, carry out the calculation choosing the type and the platform number on main equipment, and on the index form the calculation bear fruit write is calculated in equipment. All above school assignment all accomplishes the queen , assist equipment to need reserving width , altitude and the space must ensure that , ought to according to stipulating a form to secretly scheme against or checking, flat surface arrangement provides a basis to selections next step coal yard. During the period of the arrangement carrying out equipment's, ask the beam column paying attention to a workshop building to be able to not bump against equipment, the space wanting the make full use of workshop building, wants to consider bearing the floor problem too, and the completeness that guarantee builds accepting a force homogeneously, the equipment arrangement makes each school assignment arrange examine and repair space and the host , inferior passage out from flowing into material , answering a workshop building besides , to the full. Arrange to be that some layer of space utilization ratio is not high , may arrange control room , guards' room etc.High-effect designing being adopting originally make use of, school assignment flows by itself to the full one by one , decrease energy consumption , space arrangement are compact since reasonableness , another, adopt recirculating water , foul water blowoff is few, also comparatively clean hygiene of work environment. Come to say the entire selections coal system simplicity is reliable , cost is also lower population, effect does not alternate selections also very much. That synthesis reclaims , protect the environment , auxiliary equipment , workshop building structure etc. design reasonableness, makes beneficiation plants capital construction invest bringing maximal beneficial result into play.
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