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Method and device for drying and upgrading lignite

A lignite drying technology, which is applied in the direction of drying machine combination, drying solid materials, heating to dry solid materials, etc., can solve the problem of uneven drying effect of lignite, achieve high-efficiency quality improvement and comprehensive utilization, improve quality, and low cost Effect

Inactive Publication Date: 2011-12-07
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can improve the comprehensive utilization rate of lignite, but it does not solve the problem of uneven drying effect during the drying process of lignite with different particle sizes

Method used

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  • Method and device for drying and upgrading lignite
  • Method and device for drying and upgrading lignite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The lignite drying and upgrading device of the present invention is as figure 1 As shown, it is mainly composed of pre-drying / screening device 1, hot blast stove 2, drying drum 10, vibrating fluidized bed 11, cyclone separator 9, dust collector 8, and mist eliminator 6. The hot air stove is respectively connected to the drying drum and the vibrating fluidized bed to provide dry hot air for the drying drum and the vibrating fluidized bed. The inlet of the pre-drying / screening device is connected with the lignite raw material bin, and the outlet is respectively connected with the drying drum and the vibrating fluidized bed. The product outlet of the drying drum 10 is connected to the large-diameter lignite product storehouse outside the device, and the gas outlet is connected to the dust collector 8 . The product outlet of the vibrating fluidized bed 11 is connected to the small-diameter lignite product bin, and the gas outlet is connected to the dust collector through t...

Embodiment 2

[0022] The process flow of the lignite drying and upgrading device in this example is the same as that in Example 1, the sieve opening of the pre-drying / sifter vibrating screen is 10mm, and the preheating temperature is 150-200°C. The lignite with large particle size larger than 10mm is dried in the drying drum 10. The flue gas temperature at the inlet of the drying drum is 350°C, and the outlet temperature is 280°C. After drying, the moisture content of the lignite drops below 10%. The lignite with a small particle size less than 10mm is dried in the vibrating fluidized bed 11. The flue gas temperature at the inlet of the vibrating fluidized bed is 350°C, and the outlet temperature is 260°C. After drying, the moisture content of the lignite drops below 8%. Others are the same as in Example 1.

Embodiment 3

[0024] The sieve hole of the pre-drying / sifter vibrating screen is 15mm, and the preheating temperature is 200-250°C. The lignite with a large particle size larger than 15mm is dried in the drying drum 10, and the flue gas temperature at the inlet of the pre-drying / sieving device is 400°C , the outlet temperature is 330°C, and the moisture content of the lignite after drying is reduced to below 10%; the lignite with a small particle size less than 15mm is dried in the vibrating fluidized bed 11, the flue gas temperature at the entrance of the vibrating fluidized bed is 400°C, and the outlet temperature is 310°C °C, the moisture content of the lignite drops below 10% after drying. Others are the same as in Example 1.

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Abstract

The invention provides a method and device for drying and upgrading lignite. The device includes a drying / sieving device, a preheating drying / sieving device, a hot blast stove, a drying drum, a vibrating fluidized bed, a cyclone separator, a mist eliminator and a dedusting device. device. The hot blast furnace is connected to the drying drum and the vibrating fluidized bed respectively, and the outlet of the pre-drying / sifter is respectively connected to the drying drum and the vibrating fluidized bed. The preheating drying / screening device divides the lignite into two grades of large and small particle sizes. The high-temperature flue gas generated by the hot blast stove is used as the heating medium, and the remaining low-oxygen gas after the oxygen is separated by the air separation system is used to adjust the temperature of the flue gas. Drying drum and vibrating fluidized bed produce large and small particle size upgraded lignite to meet different production needs. Part of the exhaust gas is recycled for preheating lignite raw material after demisting. In the invention, the lignite is dried and upgraded according to the size of the particle size through the classification equipment, which eliminates the problem of uneven drying caused by different particle sizes, realizes the efficient quality improvement and comprehensive utilization of coal resources, and is used for large-scale lignite drying Upgrading process.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and in particular relates to a method and device for drying and upgrading lignite. Background technique [0002] Lignite is an important energy and chemical raw material, but due to factors such as high moisture content, low calorific value, and easy spontaneous combustion of lignite, the use and sales of lignite are limited. The high moisture content of lignite is not only unfavorable to use, but also consumes energy during thawing, drying, and crushing, and wastes transportation capacity, reducing the calorific value of lignite, and is not suitable for long-distance transportation. How to rationally develop and use lignite resources is an important subject worthy of in-depth study, and more attention is paid to the transformation and utilization of lignite. Studies have shown that after lignite is dried and upgraded, its composition and properties are close to those of bit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/00F26B20/00C10L9/00C10L5/00
Inventor 张亚通李立胡永其闫永成康荣灿赵常义邸玉龙王晓承
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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