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Method for carrying out fluidized drying on lignite by microwaves

A technology of fluidized drying and lignite, which is applied in the direction of drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of lower coal coking quality, low drying efficiency, high energy consumption, etc. The effect of large solid contact area and high energy utilization rate

Inactive Publication Date: 2013-05-01
KEDA INDUSTRIAL GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not dried, it is not conducive to transportation and storage, and it is difficult to meet the quality requirements of various users.
[0004] Wan Yongzhou et al. introduced drying lignite technologies such as rotary tube heat method, steam fluidized bed, thermal dehydration process / method in "Coal Engineering" 2008 No. 8, page 91-92; patent CN10132626 discloses "coal Microwave Drying": After the coal is graded, it is loaded into a two-stage or multi-stage microwave chamber through a conveyor to dry to obtain coal with a moisture content within the target moisture content. This method has the disadvantage that the evaporated moisture during the drying process is difficult to be taken out quickly. And because the depth of microwave penetration of water-containing lignite is limited, it is impossible to increase the thickness of the coal seam to achieve large-scale drying, and it is difficult to ensure the uniformity and depth of drying, which will easily cause combustion and reduce the coking quality of coal. If the capillary pores are opened and deep drying is not carried out, the effect of quality improvement will not be achieved, but the hydrophilicity of coal will be enhanced, and it will easily absorb water, which is not conducive to storage
[0005] The above known technical solutions all have such or such problems as complex equipment and process, low drying efficiency, high energy consumption, and inability to deep dry, making it difficult to realize large-scale lignite drying production

Method used

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  • Method for carrying out fluidized drying on lignite by microwaves
  • Method for carrying out fluidized drying on lignite by microwaves
  • Method for carrying out fluidized drying on lignite by microwaves

Examples

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Effect test

Embodiment 1

[0024] In the method of the invention, the raw material lignite is firstly pre-dried through a microwave device with hot air through a conveying device along a horizontal direction, and then fluidized and dried through a fluidized bed device with hot air, so that the free water content of the raw material lignite reaches below 1%.

[0025] The device that the inventive method adopts is horizontal, as figure 1 As shown, the solid line arrow in the figure is the movement direction of the raw material lignite, and the dotted line arrow is the movement direction of the hot air. The raw material lignite is generally lignite with a water content of more than 20% and a particle size of less than 10mm. The raw lignite is added to the horizontal crawler conveying device 7 in the microwave device 5 through the hopper 1 of the device through the planetary feeder 2. When the raw lignite passes through the microwave device in the horizontal direction on the horizontal crawler conveying dev...

Embodiment 2

[0029] The fluidized drying device in embodiment 1 can also adopt horizontal fluidized bed, as image 3 As shown, after the raw coal enters the feed port 13 of the fluidized bed 15 from the outlet end 11 of the microwave device 5 through the planetary feeder 12, the blower 17 blows the hot air from the hot blast stove 16 (160°C to 220°C, oxygen content 20%) (below) is pressurized and fed into the fluidized bed 15. The fluidized bed 15 is provided with a number of horizontally arranged fluidized chambers 25 separated by partitions 23 and corresponding air inlet branch pipes 24. The hot air passes through the air inlet branch pipes 24 and the air distribution After the plates 20 are evenly distributed, the raw material lignite is fluidized, and moves from the fluidized chamber 25 at the feed end to the fluidized chamber 25 at the discharge end step by step through the partition plate 23, and overflows from the fluidized bed outlet 14 in a granular state. Enter the finished produ...

Embodiment 3

[0031] Another method of the present invention is that the raw material lignite is pre-dried through a microwave device with hot air along the vertical downward direction, and then fluidized and dried through a fluidized bed device with hot air to reduce the free water content of the raw material lignite. to less than 1%.

[0032] The device that the inventive method adopts is vertical, as Figure 4As shown, the solid line arrow in the figure is the movement direction of the raw material lignite, and the dotted line arrow is the movement direction of the hot air. The raw material lignite is generally lignite with a water content of more than 20% and a particle size of less than 10mm. The raw lignite is fed into the microwave device 14' from the feeding port 1', and the rotating shaft 17' of the conveying device rotates at a constant speed under the drive of the motor, and at the same time drives the rake-shaped stirring part 2' and the conical material guide plate 15' fixed o...

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Abstract

The invention discloses a method for carrying out fluidized drying on lignite by microwaves. The method comprises the steps of: pre-drying crude lignite by a microwave device with hot air, and then carrying out fluidized drying on the lignite by a fluidizing bed with hot air so that the free water content in the crude lignite is lower than 1 percent. By utilizing the method disclosed by the invention, large-scale, rapid, low-energy-consumption and deep drying production of lignite can be realized.

Description

technical field [0001] The invention belongs to the field of lignite drying, in particular to a method for microwave fluidized drying of lignite. Background technique [0002] International geologists predict that the geological reserves of hard coal in the world are about 6 trillion tons, and the geological reserves of lignite are about 4 trillion tons. my country's lignite reserves account for about 16% of the world's total lignite reserves, and it is one of my country's main coal resources. [0003] Lignite is a kind of brown-black low-grade coal whose coalification degree is between peat and bituminous coal. The total moisture content can generally reach 20-50%. At present, lignite is generally dried by flue gas pre-drying or steam drying process abroad, and then directly sent to pit-mouth power plants for combustion and power generation. The number of pit-mouth power plants in my country is small, and most power plants are far away from coal mines, and the transportati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/347F26B3/08
Inventor 彭虎夏广斌高泽斌刘忠
Owner KEDA INDUSTRIAL GROUP CO LTD
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