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Coal dressing method

A coal preparation and coal washing technology, applied in chemical instruments and methods, wet separation, lighting and heating equipment, etc., can solve the problems of high-sodium coal desodiumization, boiler hazards, etc., to increase calorific value, reduce hazards, heat The effect of value enhancement

Active Publication Date: 2016-03-16
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a coal preparation method that can remove sodium Sodium can also remove the moisture in coal, reduce the harm caused by the combustion of sodium in coal and increase the calorific value of coal

Method used

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  • Coal dressing method

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Embodiment 1

[0053] This embodiment is used to illustrate the coal preparation method provided by the present invention. This embodiment adopts figure 1 device shown.

[0054] The high-sodium raw coal A enters the raw coal crushing unit 2 through the raw coal feeding unit 1, and after being crushed by the raw coal crushing unit 2, it enters the screening unit 3 for screening, and the high-sodium coal C with a particle size greater than 100mm enters the raw coal crushing unit 2 for secondary Broken, the high-sodium coal B with a particle size of no more than 100 mm enters the microwave upgrading and desodiumizing unit 4 . The microwave source located outside the microwave heating chamber with a power of 75kW and a working frequency of 915MHz transmits microwave energy to the energy feed port on the top of the microwave heating chamber through the waveguide to heat the high-sodium coal B in the microwave heating chamber. Wherein, the length of the microwave heating cavity along the transmi...

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Abstract

The invention relates to the field of coal upgrading and discloses a coal dressing method. The method comprises the following steps: sending high-sodium coal to a microwave upgrading and sodium removing unit (4) for removing sodium; outputting sodium-removed coal by using the microwave upgrading and sodium removing unit (4); sending the microwave upgrading and sodium removing unit (4) to a coal washing unit (5) for dressing by washing; sending refined coal output by the coal washing unit (5) to a refined coal bunker (7); supplying hot air to the refined coal bunker (7) by air and dehumidified steam which comes from the microwave upgrading and sodium removing unit (4) after the air and the dehumidified steam pass through a condensing heat exchanger (6); drying the refined coal by using the hot air. By adopting the coal dressing method provided by the invention, sodium in the coal can be removed, water in the coal can also be removed, harms caused by combustion of sodium element in the coal can be reduced, and the calorific value of the coal is increased as well.

Description

technical field [0001] The invention relates to the field of coal upgrading, in particular to a coal preparation method. Background technique [0002] High-sodium coal refers to coal with a Na content greater than 2% by weight, which is mainly distributed in China, Australia, the United States, Germany and other countries. China's high-sodium coal is mainly distributed in the Zhundong region of Xinjiang. Xinjiang Zhundong coal has good reactivity and is easy to burn out. However, due to the history of coal formation and the special local natural and geographical environment, the sodium content in Zhundong coal is generally more than 2% by weight, which is much higher than that of power coal in other regions, and the coal produced in some mining areas is even as high as 10% by weight. Due to Xinjiang's special geographical location, economic conditions and traffic conditions, coal cannot be transported abroad on a large scale. Some power plants in Xinjiang have begun to ble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/347H05B6/80B03B5/00
CPCB03B5/00F26B3/347F26B2200/08H05B6/80H05B2206/04
Inventor 赵剑张永桂陈磊田惠生
Owner CHNA ENERGY INVESTMENT CORP LTD
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