Process for preparing fuel of gangue power plant by using washing gangue rich in kaolinite rock and sandstone by dry method

Abstract

The invention discloses a process for preparing fuel of a gangue power plant by using washing gangue rich in kaolinite rock and sandstone by a dry method. The process is characterized by comprising the following steps of: performing preliminary classification and selective crushing on the washing gangue rich in kaolinite rock and sandstone and recovering bulk sandstone with high hardness; and classifying fine gauge particles again, feeding into a CFX sorting machine and a vibration counter flow sorting machine, and performing dry separation to obtain solid waste and fuel with a low heating value; in a dry separation method, ventilation air of a power plant is particularly led, the moisture of a product is reduced by using residual heat, and the heating value and the utilization rate of the fuel of the power plant can be improved. By the process, the gangue associated mineral is separated, the heat loss of a circulating fluidized bed boiler is eliminated, the discharge amount of ash residue and coal ash of the power plant is reduced, environmental pollution is reduced, the problem that kaolinite rock and sandstone wear a boiler is solved, and safety production of the power plant is guaranteed well.

Description

technical field [0001] The invention relates to a sorting technology, in particular to a dry sorting process for washed gangue rich in kaolinite and sandstone, which can effectively recover low calorific value fuels in the gangue. technical background [0002] my country is the world's largest coal producer and consumer. In 2010, coal production reached 3.24 billion tons and consumption reached 3.4 billion tons. Coal washing and processing is an indispensable and important link in the process of coal production and efficient utilization. During the "Eleventh Five-Year Plan" period, the raw coal washing capacity and selection volume increased rapidly. In 2010, the raw coal selection capacity reached 1.78 billion tons, and the selection volume reached 1.65 billion tons. The raw coal washing rate increased from 31.9% in 2005 to 50.9% in 2010. %. Moreover, the China Coal Industry Association's "Twelfth Five-Year Plan" development guidance pointed out that by 2015, the selected...

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Problems solved by technology

[0007] Coal gangue, especially the ash content of coal gangue after selection, is generally above 60% to 70%. These coal gangue with high ash and high sulfur content directly enter the boiler for combustion, which will inevitably bring about two serious problems: first, the thermal efficiency of the boiler decreases, It will increase the cost of transportation and fuel preparation, resulting in serious energy waste; the second is boiler smoke and SO 2 High emissions will cause serious environmental pollution

Wet separation is mainly jigging separation and dense medium separation. This separation method is highly dependent on water resources and is not suitable for arid and water-scarce areas in Northwest China, requiring a complex slime water treatment system; dry separation is mainly The compound dry sorting machine (FGX) is used for direct sorting. The sorting accuracy of this dry treatment process is not high, and it is mainly used for the pre-casting of easy-to-separate coal, and it is difficult to clean the gangue rich in kaolinite and sandstone. sorting

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