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Method for drying and dewatering coal at low temperature

A low-temperature, coal-fired technology, applied in the direction of drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of limited calorific value increase and low moisture removal rate, and achieve the effect of increasing calorific value and good safety performance

Inactive Publication Date: 2011-05-04
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has problems such as low moisture removal rate and limited increase in calorific value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, long-flame coal circulation low-temperature drying dehydration

[0026] Use long-flame coal as raw material, the coal particle size is 0-50mm, the weight content of water in coal is 28%, the weight content of ash is 25%, and the calorific value is 4200kcal / kg; the volume content of water in hot air is 7% ; The ratio of hot air volume flow to coal volume flow is 6:1. The internal heating drying rotary furnace produced by Chengde Suspension Conveying Group is used as the dryer, and the coal processing capacity is 20t / h. The gas temperature at the gas inlet of the drying rotary furnace is 170°C, and the gas temperature at the gas outlet is 60°C; the dried coal is cooled. The temperature is lower than 45°C; the direction of movement of hot air is countercurrent to that of coal. After one drying and dehydration treatment, the moisture weight content in the coal is reduced to 18%, the calorific value is 4800kcal / kg, and the moisture removal rate is about 35%. ...

Embodiment 2

[0027] Embodiment 2, lignite series low temperature drying and dehydration

[0028] Using lignite as raw material, the coal particle size is 0-30mm, the weight content of moisture in coal is 35%, the weight content of ash is 26%, and the calorific value is 2800kcal / kg; the volume content of moisture in hot air is 6%; The ratio of air volume flow to coal volume flow is 4:1. Three cascading operations were performed using the sprinkler dryers produced by Tangshan Shenzhou Machinery Company. The gas temperature at the gas inlet of the dryer is 160°C, and the gas temperature at the gas outlet is 50°C; in a single dryer, the moving direction of the hot air is countercurrent to the moving direction of the coal. After being dried by the first dryer, the weight content of moisture in the coal is reduced to 21%, and the calorific value is 3500kcal / kg. After the dried coal is cooled, it enters the second dryer, and the process conditions of the second dryer are the same as those of th...

Embodiment 3

[0029] Embodiment 3, non-caking coal circulation low temperature drying dehydration

[0030] Using non-caking coal as raw material, the coal particle size is 0-20mm, the weight content of moisture in coal is 25%, the weight content of ash is 19%, and the calorific value is 4500kcal / kg; the volume content of moisture in hot air is 4%, The ratio of hot air volume flow to coal volume flow is 8:1. The three-cycle drying process is carried out by using the sprinkler dryer produced by Tangshan Shenzhou Machinery Company. The gas temperature at the gas inlet of the dryer is 225°C, and the gas temperature at the gas outlet is 60°C; the moving direction of the hot air is countercurrent to the moving direction of the coal. After the first cycle drying treatment, the moisture weight content in the coal is reduced to 19%, and the calorific value is 4900kcal / kg. Then the coal enters the dryer again for the second cycle drying treatment. After the second cycle drying treatment, the moistu...

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PUM

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Abstract

The invention relates to a method for drying and dewatering coal at low temperature, which comprises the following steps: (1) drying coal with a drier provided with an air inlet and an air outlet, adding the coal to the drier; and blasting dry air through the air inlet of the drier to dry the coal, wherein the temperature of the air through the air inlet of the drier is less than or equal to 300 DEG C, the ratio of the volume flow of the dry air to the volume flow of the coal is (3-20):1, and the volume content of the moisture in the dry air is less than or equal to 10% or the relative humidity is below 40%; and (2) repeating the course in step (1) to repeatedly dry the coal obtained in step (1), wherein the course should be repeated 1-8 times. The method provided by the invention can greatly eliminate the moisture in the coal and obviously enhance the heat value of the coal.

Description

technical field [0001] The invention relates to a coal quality-upgrading processing method, in particular to a method for low-temperature drying and dehydration of coal. Background technique [0002] The upgrading process of low calorific value coal is mainly to reduce impurities such as moisture and ash in coal and increase the calorific value of coal. At present, there are many ways to reduce coal moisture at home and abroad. According to the movement mode of coal, there are fluidized bed, moving bed and entrained bed, etc., according to the heating method, there are internal heat type and external heat type, and according to the heat source, there are steam method and flue gas method . No matter what kind of dehydration process is used, reducing energy consumption, reducing costs, and improving the safety of coal drying and dehydration operations are the keys to coal drying and dehydration technology. [0003] Mature coal drying and dehydration technologies at home and ...

Claims

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Application Information

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IPC IPC(8): F26B3/06
Inventor 张文辉杨汉宏徐会军杨俊哲贺安民
Owner CHINA SHENHUA ENERGY CO LTD
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