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A lignite multi-stage drying and upgrading system

A multi-stage drying and drying system technology, applied in the direction of drying machine combination, drying solid material, drying gas arrangement, etc., to achieve the effect of fast drying speed, small diffusion resistance and easy product energy

Active Publication Date: 2016-03-30
徐州中伦光伏材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above technologies have their own characteristics and have improved the overall efficiency of lignite utilization in some aspects, they have not completely solved the following problems:

Method used

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  • A lignite multi-stage drying and upgrading system
  • A lignite multi-stage drying and upgrading system
  • A lignite multi-stage drying and upgrading system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: A lignite multi-stage drying and upgrading system, the processing steps are as follows:

[0052] 1) The lignite is transported into the drying and upgrading system through the feeder, and is firstly crushed by the crusher to obtain lignite particles of different sizes;

[0053] 2) In the conveyor belt drying room of the first drying system, the water-containing lignite particles of different sizes are in the process of smooth movement, and they are partially dehydrated in contact with the small particles of coal that have been deeply dehydrated by the second-stage air dryer and the high-temperature flue gas from the boiler. The surface moisture of lignite is removed, the first-stage dried solid product enters the airflow dryer of the second-stage drying system, and the flue gas drying tail gas enters the cyclone separator;

[0054] 3) The partially dehydrated lignite enters the airflow dryer of the second-stage drying system, where the small particles of lignite are...

Embodiment 2

[0059] Embodiment 2: A multi-stage drying and upgrading system for lignite, the processing steps are as follows:

[0060] 1) The lignite is transported into the drying and upgrading system through the feeder, and is firstly crushed by the crusher to obtain lignite particles of different sizes;

[0061] 2) In the drum drying room of the first-stage drying system, the water-containing lignite particles of different sizes are in the process of smooth movement, and they are partially dehydrated in contact with the small particles of coal that has been deeply dehydrated by the second-stage airflow dryer and the high-temperature flue gas from the boiler. , To remove the surface moisture of the lignite, the solid product enters the airflow dryer of the second stage drying system, and the flue gas drying tail gas enters the cyclone separator;

[0062] 3) The partially dehydrated lignite enters the airflow dryer of the second-stage drying system, where the small particles of lignite are carri...

Embodiment 3

[0067] Embodiment 3: A multi-stage drying and upgrading system for lignite, the processing steps are as follows:

[0068] 1) The lignite is transported into the drying and upgrading system through the feeder, and is firstly crushed by the crusher to obtain lignite particles of different sizes;

[0069] 2) In the screw drying chamber of the first-stage drying system, the water-containing lignite particles of different sizes are in the process of smooth movement, and they are partially dehydrated in contact with the small-particle coal powder that has been deeply dehydrated by the second-stage airflow dryer and the high-temperature flue gas from the boiler. The surface moisture of lignite is removed, the solid product enters the airflow dryer of the second stage drying system, and the exhaust gas from the flue gas drying enters the cyclone separator;

[0070] 3) After a section of partially dehydrated lignite enters the airflow dryer of the second-stage drying system, the small particl...

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Abstract

The invention discloses a brown coal upgrading system employing multi-stage drying to construct an integrated brown coal upgrading and using device. Multi-size-and-stage coupled drying is performed to the brown coals, and substance and energy, generated during drying upgrading, are fully utilized. In a first-stage drying, after passing a drying chamber, the brown coals directly contact with high-temperature smoke and recycled small particle drying powdered coals to dehydrate and then are fed into an airflow dryer of a second-stage system. Under winnowing action of the smoke, the small particle powdered coals in the airflow dryer is carried by the airflow to move upwards to achieve deep drying, with one part thereof serving as a boiler fuel, and the other part thereof returning the drying chamber to serve as solid heat carrier and lubrication medium to decrease abrasion of large particle powdered coals and strengthening drying efficiency of the same. While large particle brown coals are separated and fed into a superheated steam dryer to achieve deep dehydration and outputting. The drying media such as the smoke and the superheated steam are all provided by a coal fired boiler, and the dried finished powdered coals and solid powdered coals, generated from a cyclone separator, serve as the fuel.

Description

Technical field [0001] The invention belongs to the technical field of low-rank coal processing, and particularly relates to a lignite multi-stage drying and upgrading system. Background technique [0002] With its relatively abundant reserves and long history of use, coal occupies a very important position in my country’s energy structure. This situation will not change significantly in the foreseeable future. Therefore, improving the efficiency of coal utilization will contribute to my country’s energy conservation and reduction. Drainage work has outstanding significance, especially for low-rank coals with low coalification and poor quality, such as lignite. [0003] Lignite is also called diesel coal. Compared with ordinary bituminous coal or anthracite, lignite has high moisture (up to 40-60%) and volatile content, is easy to weather and break in the air, has strong chemical reactivity, and is prone to spontaneous combustion. The nature determines that the thermal efficiency o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B1/00F26B20/00F26B25/00F26B21/14
Inventor 杨福胜张早校黄英睿刘霞李金梦
Owner 徐州中伦光伏材料有限公司