Method and device for drying and quality enhancement of 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, low energy consumption, and improve quality effect

Inactive Publication Date: 2010-07-14
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 quality enhancement of lignite
  • Method and device for drying and quality enhancement of 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 a device for the drying and the quality enhancement of lignite. The device comprises a drying/sieving device, a preheating and drying/sieving device, a hot blast heater, a drying drum, a vibration fluidized bed, a cyclone separator, a defogger and a dust remover. The hot blast heater is respectively connected to the drying drum and the vibration fluidized bed, and an outlet of the preheating and drying/sieving device is respectively connected with the drying drum and the vibration fluidized bed. The preheating and drying/sieving device divides the lignite into two stages of big particle diameter and small particle diameter, high-temperature flue gas generated by the hot blast heater is used as a heating medium, the temperature of the flue gas is regulated by the residual low-oxygen gas after oxygen gas is separated by using an air separation system, the drying drum and the vibration fluidized bed are used for producing the quality-enhanced lignite with the big particle diameter and the small particle diameter, different production requirements are met, and part of exhausted tail gas is circularly used for preheating the raw materials of the lignite after being defogged. The invention respectively carries out drying and quality enhancement on the lignite according to the sizes of the particle diameters by grading equipment, eliminates the problem of uneven drying caused by different particle diameters, realizes the effective quality enhancement and the comprehensive utilization of coal resources, and is used for the large-scale process of drying and quality enhancement of the lignite.

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 Applications(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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