The role of coal and the mining process
The role of coal
Extensive use of coal, can be summed up in accordance with its intended use two main purposes: (1) thermal coal (2) of coking coal.
The main purpose of thermal coal are:
1) Power generation coal: China about 1 / 3 of the coal used for power generation, coal generation is the current average standard coal 370g / (kW · h) or so. Power plants use the heat value of coal, the heat energy into electrical energy.
2) steam coal: coal-fired power accounts for about 2% of the average coal steam boiler indicators 100kg / (ton km) or so.
3) Building Materials coal: about power more than l0% of coal to cement the largest amount of coal, followed by glass, brick, tile and so on.
4) Coal Mobile Crusher, general industrial steam coal: In addition to large-scale thermal power plants and heating boilers, in general, corporate and industrial boiler heating model range, the number of large and dispersed, coal accounts for about 30% of steam coal, Shanxi Coal Talent Network.
5) Life of coal: the larger the number of coal of life, about 20% of fuel coal.
6) The metallurgical thermal coal: steam coal for metallurgy sintering and blast furnace is mainly used anthracite, the amount of less than 1% of coal power.
(2) of coking coal
Although China is rich in coal resources, but relatively few resources of coking coal, coking coal reserves of only 27.65% of total coal reserves.
Class includes coking coal gas coal (accounting for 13.75%), fat (accounting for 3.53%), coking coal (accounting for 5.81%), lean (accounting for 4.01%), others are not sub-grade coal (0.55%); non- Class includes anthracite coking coal (accounting for 10.93%), lean coal (accounting for 5.55%), weak base coal (accounting for 1.74%), non-payment of coal (13.8%), long-flame coal (accounting for 12.52%), brown coal (accounting for 12.76 %), natural coke (accounting for 0.19%), not sub-grade coal (accounting for 13.80%) and grades of coal unclear (accounting for 1.06%).
The main purpose is refining coking coal coke, coke from the coking coal or mixed coal high temperature smelting from the general about 1.3 tonnes of coking coal to coke smelting a ton. Coke used for steel making, is a major producer of steel and other raw materials industry, steel industry has been hailed as the "basic food."
Coal mining process
Gangue emissions: emissions from the largest coal production of solid waste, industrial solid waste is produced in China and the accumulation of the largest volume of solid waste output is generally about 10% of coal production. China's annual emissions of coal gangue about 1.5 billion to 2.0 billion tons. The end of 2002, the country earned about 3.4 billion tons of coal gangue, covering 26,000 hectares, is the output of industrial solid waste and accumulated in the cumulative amount of the largest solid waste. In 2004, the amount of gangue comprehensive utilization of 1.35 million tons, 54% utilization.
Mine water discharge: in mine construction and production process, various types of raw water will enter the tunnel through different ways and face, in order to ensure mine safety, to prevent water damage occurs, the need to discharge mine water inflow. According to incomplete statistics, in the mining process, the 2004 national coal mine water discharge about 30 billion m³, the average discharge per ton of coal is about 2m ³. Resource utilization accounted for only 22%.
, Driving the compressor;
Mine gas drainage and ventilation: in the former coal mining and gas exploration in the gas drainage is an important measure to ensure mine safety. But the drainage of the gas into the atmosphere, will have a strong greenhouse effect, greenhouse gas methane contained 20 times larger than carbon dioxide. Another mine in the production process, the underground tunnel will need hundreds of thousands or even every second millions of cubic meters of air, which is mainly done through the mine ventilation, mine ventilation also contain gas, and there are a lot of dust. According to estimates of the evaluation in recent years, the national coal seam gas resource of 3 × 106 Mm ³. In 2002 China's key coal seam gas production capacity of 9773.37Mm ³, which use gas capacity of 517.49 Mm ³, utilization rate of about 5%.
Traditional coal mining neglecting other symbiotic and associated minerals mining, processing, utilization, resulting in waste of resources. China coal co, 20 kinds of minerals associated with, the vast majority did not use the free storage of discarded other minerals can also cause environmental pollution and damage to ecological environment.
Coal Mill there are many. According to the shape and composition of materials can be divided into wet material grinding, dry material grinding, super-hard material grinding, crushing both wet and dry material, frozen material crushed. According to the principle can be divided into single-stage crush crush crush-and two-stage type.
Characteristics of Coal Crusher
1, without any requirements on the material moisture content, and the production process does not block, small high;
2, so that the noise generated when the mill material greatly reduced, and the equipment running very smooth body, no need to install the foundation;
3, the higher the rotor material broken into small particles and then breaking through the lower rotor is a special fine powder;
4, configuration, centralized distribution to the oil pump, the machine can work in the state of the machine at any time while filling oil all the bearings and convenient;
5, the mill equipment into a two-way technology transfer gap, the material is free to the granularity of control equipment, making production more humane.
Application Technology of Coal mill
Coal mill can be broken with common materials, two-level stone, cinder, shale, slag, cement, river gravel, iron ore, limestone, and so a variety of materials, construction industry and other industries, more materials can be broken.
Questions and Answers
With worldwide scientific and technological progress, the coal business is altering from labor-intensive into capital and technology-intensive. The coal technology has also transformed from mechanized production to automated control. Robot or synthetic intelligence mixed with expert is the new way for coal mining.
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