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Low rank coal high temperature flue gas drying method and device

A technology of high-temperature flue gas and low-rank coal, which is applied in the direction of drying solid materials, heating to dry solid materials, drying, etc., and can solve the problems of low processing efficiency, low efficiency, and low drying efficiency

Active Publication Date: 2008-10-29
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
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Problems solved by technology

The treatment efficiency of this technology is low, and the water content of the treated lignite is still high
[0010] The temperature of the drying medium used in Australian lignite BCB air drying is low, and the drying efficiency is not high
[0011] However, there are many problems in the above-mentioned existing drying technologies such as high energy consumption, complicated process or low efficiency.

Method used

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  • Low rank coal high temperature flue gas drying method and device

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Embodiment 1

[0075] See attached figure 1 , the lignite with a moisture content of 31-38% by weight is pulverized into pulverized coal with a particle size of less than 3mm by the pulverizer 1 and sent to the silo 2 for storage. The pulverized coal is sent to the air dryer 4 through the quantitative feeder 3 for drying. The drying medium is the high-temperature flue gas formed in the mixing chamber 11, the oxygen content of the high-temperature flue gas is controlled at about 8% by volume, and the temperature is controlled at about 720°C. Coal powder and high-temperature flue gas meet at the inlet of dryer 4 and stay in the drying pipe for 3-5 seconds. The flue gas carrying pulverized coal from the dryer 4 passes through the cyclone separator 5 to separate the pulverized coal from the flue gas, and the dry pulverized coal is discharged from the lower part of the cyclone separator 5. The outlet temperature of the pulverized coal is controlled at 80-120°C and the water content is controlled...

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Abstract

The invention relates to a method of high-temperature flue gas drying, which is particularly suitable for drying long flame coal, brown coal or other low rank coal. The coal-fired high-temperature flue gas is used to dry flammable and explosive coal types, such as brown coal in the direct contact method; therefore, the method has less gas exhaust, high thermal efficiency and high drying speed. The internal water content of the dried coal is obviously reduced, and the heating power of the dried coal is greatly increased. The invention also relates to the device using the method.

Description

technical field [0001] The invention relates to a method for drying coal, which is especially suitable for drying long-flame coal, lignite and other low-rank coals. The invention also relates to a device using the method. Background technique [0002] Low-rank coal refers to coals with relatively shallow metamorphism such as lignite, long-flame coal, non-caking coal, weakly caking coal and gas coal. This part of coal occupies a considerable proportion in the proven coal reserves, especially Lignite and long-flame coal dominate. [0003] Due to its low calorific value, high water content, and easy spontaneous combustion, low-rank coal brings many difficulties to its storage, transportation, and combustion. In view of the above characteristics, in order to rationally utilize low-rank coal resources, many countries in the world have carried out a lot of research and development work on low-rank coal processing and conversion technologies, and achieved many important theoretic...

Claims

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Application Information

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IPC IPC(8): F26B3/10
Inventor 邵俊杰朱书全苏晓辉张平何立新
Owner CHNA ENERGY INVESTMENT CORP LTD
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