Process for dryness, formation and further processing of water-enriched lignite

A technology of lignite and process, applied in the field of comprehensive and efficient utilization of water-rich lignite, can solve the problems of poor coal quality, low efficiency, overheating, etc. Effect

Active Publication Date: 2009-09-02
CHINA NAT CHEM ENG GRP CORP LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0005] The traditional drying process uses flue gas or steam-air combined heat medium to directly contact lignite to heat it, water evaporates, an

Method used

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  • Process for dryness, formation and further processing of water-enriched lignite

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[0037] Example 1. The process flow and main parameters of a lignite drying, forming and upgrading device with an annual output of 1 million tons of lignite designed by the present invention.

[0038] Process description (see Figure 1)

[0039] 1. Lignite crushing: The lignite from the boundary area at room temperature and rich in water content of 35wt% first enters the raw coal feed bin, and is sent to the coarse crusher (double-roller crusher) via the unloading belt conveyor and the feeding belt conveyor. The double-roll crusher with high-alloy material rotates in opposite directions to crush the material to the size of the double-roll gap. The coal particles entering the double-roll crusher are ≤300mm, and the crushed coal particles are 20-50mm. The coal particles discharged from the crusher are sent to the silo through the feeding belt conveyor, and the coal particles from the silo enter the coarse coal vibrating screen. The sieved coarse coal particles are finely crushed (reve...

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Abstract

The invention provides a process for dryness, formation and further processing of water-enriched lignite. The process mainly comprises storage of the lignite, material transfer, crushing of lignite grains, rotary drum-shaped body multi-pipe drying, refined crushing, heating, hot pressing forming, screening and material return. The products can be used in process engineering in the fields of transportation, smelting, combustion, power generation or aerification. In the drying process, a rotary drum-shaped body multi-pipe drying device is used, and low-pressure vapor is indirectly used in the drying process, thereby avoiding the explosion due to the reaction of volatile compounds and oxygen, which is caused by too high temperature in the drying process; and in the forming process, little amount of internal water in capillary tubes of the lignite is used as a bonding agent, at certain temperature and grain size and under a certain pressure, gaps between lignite grains are filled by hot pressing so as to strengthen the contact between the lignite grains for forming. Because the hot pressing damages the structure of the capillary tubes of the lignite, the capillary tubes of the lignite are difficult to restore the original spongy property, thereby reducing the secondary adsorption water of the lignite grains. The process has the advantages of improving economic values of the lignite and causing little environmental pollution, along with safe drying and forming process.

Description

technical field [0001] The invention relates to the technical field of comprehensive and high-efficiency utilization of water-rich lignite for quality improvement, in particular to a process for drying, molding and quality-enhancing water-rich lignite and key equipment thereof. After the water-rich lignite is crushed, dried, formed and upgraded, it can meet the requirements of using the water-rich lignite boiler to generate electricity or pure oxygen to produce synthetic raw material gas. Background technique [0002] Because lignite contains 15wt% to 50wt% of water, it directly participates in combustion or coal gasification. On the one hand, it needs to consume a lot of energy during the ignition process; on the other hand, lignite has high volatile content and is prone to explosion. In addition, since the process of water evaporation will take away a large amount of heat energy, resulting in a large heat loss in combustion exhaust, low thermal efficiency of power generati...

Claims

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Application Information

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IPC IPC(8): C10L5/04
Inventor 汪寿建傅敏燕敦忆岚单育兵袁学民李景懿刘亦武傅校英程靖
Owner CHINA NAT CHEM ENG GRP CORP LTD
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