A pulverized coal granulation method and equipment for lignite

A technology of granulation and pulverized coal, which is applied in the field of coal processing and utilization, can solve the problems of not meeting the requirements of forming, hindering processing and storage, and expensive equipment, and achieves good forming strength, significant moisture reduction, and low power consumption. low volume effect

CN103041745BInactive Publication Date: 2016-03-23蔡京鹏
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-03-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

Disclosed are a pulverized coal granulation method and a granulator apparatus thereof for lignite. Material preparation in a granulation process is: pulverized coal that needs to be granulated is sieved and crushed to 4 mm or less in particle diameter; the water of the pulverized coal that needs to be granulated is controlled at a water content between 20% and 45%; the pulverized coal that is sieved and crushed is transported to the granulator apparatus to be prepared into pulverized coal particles, where the pulverized coal particles are 4-12 mm in particle diameter and 5-30 mm in length; and, the pulverized coal particles granulated and molded are dried to a water content between 8% and 20%. The present invention improves an existing "technique for pressing pulverized coal after drying" into a "technique for drying pulverized coal after granulation;" the granulation technique has the advantages of low energy consumption, low equipment wear and tear, low equipment costs, low production costs, and a large yield.
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Description

technical field

[0001] The invention relates to the field of coal processing and utilization, in particular to the pulverized coal granulation and drying technology of lignite. Background technique

[0002] Lignite or low-metamorphism long-flame coal has low strength, high water content (moisture content is generally above 30%), low unit calorific value, and heavy dust pollution. The coal powder needs to be dried and pressed or granulated. The method adopted by various countries is to press into briquettes after drying or extrude into oval briquettes with rollers. Because lignite has a sponge structure, it is easy to absorb moisture in the air and expand, so the existing technology needs a lot of pressure to press into briquettes or briquettes, reaching more than 1000kg / c㎡, which consumes a lot of energy, and the power consumption per ton exceeds 50 degrees. , the equipment is expensive and the loss is large. If the raw coal is pressed and then dried in the existing pressi...

Examples

Embodiment Construction

[0033] A pulverized coal granulation method of lignite, the granulation steps are as follows:

[0034] Step 1, raw material preparation:

[0035] Sieve and crush the pulverized coal that needs to be granulated to a particle size of less than 4mm. The finer the fineness, the higher the granulation molding rate and the better the molding strength, but the powder finer than 0.1mm is the same There is no difference in molding rate and molding strength. Therefore, the particle size of pulverized coal after screening and crushing can be controlled within 4mm. The moisture content of the pulverized coal that needs to be granulated should be controlled at a moisture content of 20% to 45%. The granulation effect with a moisture content of 30% to 35% is the best, the strength is the best, the molding rate is the highest, and the operation of the granulation equipment involved is the fastest. Stable, low power consumption, only 3-10 kilowatt-hours per ton, minimal wear and tear on gran...