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Low water content high heating value coal dust and its preparing method and device

A manufacturing method and technology of water content, applied in lighting and heating equipment, heating to dry solid materials, special forms of dry distillation, etc. The effect of less suction, energy saving and production cost reduction

Active Publication Date: 2008-04-30
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the late age of coal formation and low degree of coalification, it is easy to weather and spontaneously ignite in the air, so it is difficult to store
In addition, lignite raw coal has a high moisture content, generally 30-60%. This factor not only leads to serious waste of transport capacity during transportation, but also greatly reduces its low-level calorific value in the application base.

Method used

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  • Low water content high heating value coal dust and its preparing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0051] see figure 1 . Tongliao lignite with a water content of 35-40% is pulverized by a pulverizer 1 and sieved by a vibrating sieve to obtain pulverized coal with a particle size of less than 6 mm, which is sent to a pulverized coal bin 2 for storage.

[0052]The pulverized coal in the pulverized coal bunker 2 is preheated in the preheating coal feeder 3 through the exhaust gas sent from the induced draft fan 7 and the induced draft fan 8, and the waste heat and condensed water in the exhaust gas are recovered. The preheated coal powder enters the airflow dryer 4 for preliminary drying, and the temperature of the drying medium of the airflow dryer is controlled at about 500°C, so that the moisture in the large pores of the coal powder evaporates rapidly within 0.5-2 seconds. After this process, the moisture contained in lignite is reduced from 35-40% to 10-20%. Make the pulverized coal separated and collected by the cyclone separator 9 enter the fluidized bed dryer 11, use...

Embodiment 2

[0056] The pulverized coal dried by the fluidized bed dryer 10 in Example 1 is transported to the thermal reactor 11, and the reactor is capable of continuous feeding and discharging operations. In this reactor, the pulverized coal is heated to 360°C and kept at this temperature for 30 minutes. The crude gas produced in the thermal reactor 11 is sent to the tar condenser 12 to condense and recover the tar therein. The remaining non-condensable gas is sent back to the thermal reactor 11 for combustion by the tar condenser 12, and is used as heating fuel for the thermal reactor. The flue gas produced by combustion is sent back to the blower 14 to be used as a supplement to the drying medium of the airflow dryer 4 and the fluidized bed dryer 10 .

[0057] Cool the thus prepared detarred pulverized coal until its temperature drops below the self-ignition point of the pulverized coal before discharging. The cooling process uses the above-mentioned flue gas as a protective gas to ...

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Abstract

The invention provides pulverized coal with low water content and high caloric value, and the manufacturing method and the device thereof. The method comprises the following steps that low metamorphic pulverized coal is pulverized into pulverized coal with particle diameter less than 6 mm; and the pulverized coal obtained is dried in a pneumatic dryer and / or a fluidized bed dryer until the water content is lower than 3 percent. The invention also provides pulverized coal with low water content and high caloric value, and the manufacturing method and the device thereof, wherein, the method further comprises that the pulverized coal dried is heated to be up to 150 to 460 DEG C in a heat reactor which is operated continuously, and the pulverized coal is discharged after staying for 10 to 80 minutes.

Description

technical field [0001] The present invention relates to pulverized coal with low water content and high calorific value and its manufacturing method and device, more specifically, relates to low metamorphic coal, such as various high water content, low calorific value lignite and low metamorphic bituminous coal. Coal powder with high water content and high calorific value. Background technique [0002] Low-metamorphic coals, such as lignite and low-metamorphic bituminous coal, are characterized by high water content and low calorific value. Due to the late age of coal formation and low degree of coalification, it is very easy to weather and spontaneously ignite in the air, so it is difficult to store. In addition, lignite raw coal has a high moisture content, generally 30-60%. This factor not only leads to serious waste of transport capacity during transportation, but also greatly reduces its low-level calorific value. Therefore, both at home and abroad are trying to find ...

Claims

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Application Information

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IPC IPC(8): C10L5/00C10B53/02F26B3/06F26B3/10
CPCY02E50/14Y02E50/10
Inventor 邵俊杰朱书全苏晓辉何立新
Owner CHNA ENERGY INVESTMENT CORP LTD
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