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Extrusion forming method of low-order lignite

A technology for extrusion molding and lignite, which is applied in the field of lignite briquette preparation, can solve the problems of the influence of molding equipment or process, the limited use range of briquette, and the high cost of binder, and achieves low production cost, good scalability, and adhesion. good effect

Inactive Publication Date: 2014-04-02
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The cost of binder in the molding process of lignite with binder is high, and the addition of some binders will affect the molding equipment or process, thus limiting the scope of use of briquette

Method used

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  • Extrusion forming method of low-order lignite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 The lignite lumps are crushed and screened to a particle size of ≤3mm, and the corn flour accounting for 1% of the coal mass and the water accounting for 5% of the coal mass are heated to 80-100°C to mature into corn paste. Add the binder corn paste to the lignite and stir evenly, control the molding moisture to 30%, and then send it to a screw extrusion coal rod machine for extrusion molding. The obtained coal rods are dried by airflow at 60-100°C for 6 hours to obtain briquettes. It is tested that the coal stick has a water content of 4.6%, a drop strength of 83.1%, a thermal stability of 81.6%, and a compressive strength of 7.3kgf / cm (linear pressure).

Embodiment 2

[0033] Example 2 The lignite lumps are crushed and screened to a particle size of ≤3mm, and the cornmeal accounting for 6% of the coal mass and the water accounting for 25% of the coal mass are heated to 80-100°C and matured into corn paste. Add the binder corn paste into the lignite and stir evenly, control the molding moisture to 45%, and then send it to a screw extrusion coal rod machine for extrusion molding. The obtained coal rods are dried by airflow at 60-100°C for 7 hours to obtain briquettes. It is tested that the coal stick has a water content of 14.7%, a drop strength of 95.1%, a thermal stability of 90.6%, and a compressive strength of 9.7kgf / cm (linear pressure).

Embodiment 3

[0034] Example 3 The lignite block is crushed and screened to a particle size of ≤3mm, and the wheat flour accounting for 2% of the coal mass and the water accounting for 10% of the coal mass are heated to 80-100°C and matured into a paste. Add the paste binder into lignite and stir evenly, control the molding moisture to 35%, and then send the material into a screw extrusion coal rod machine for extrusion molding, and the obtained coal rods are dried by airflow at 60-100°C for 6 hours to obtain briquettes product. It is tested that the coal stick has a water content of 9.3%, a drop strength of 89.1%, a thermal stability of 85.6%, and a compressive strength of 8.1kgf / cm (linear pressure).

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Abstract

The invention discloses an extrusion forming method of low-order lignite, relates to the field of lignite and coal briquette preparation, and particular relates to a preparation method which is applicable to lignite and coal briquette with high ash content and gel substances. The method comprises the following steps: (1) crushing and screening lignite blocks to be less than or equal to 3mm; (2) adding a binding agent into the lignite raw material according to a certain ratio, uniformly stirring and subsequently extruding to form the lignite in a coal rod machine; and (3) drying the formed coal rod at 60-100 DEG C till the moisture is less than 15% so as to obtain a coal briquette product, wherein the binding agent refers to a starch binding agent. The method is simple in process, the binding agent is easy to obtain, and an ordinary coal rod machine is used as the extrusion forming equipment for extrusion forming, the dried coal rod product is high in mechanical strength and good in thermal stability, and can be used in a coal gas generator taking the place of lump coal, and the requirements of synthesis ammonia generation process on granularity and mechanical strength of the coal briquette can be met, so that the lignite resource can be scientifically and reasonably utilized, and the production cost can be lowered.

Description

technical field [0001] The invention relates to the field of lignite briquette preparation, in particular to a preparation method for low-rank lignite (which is at the rear of hard lignite and almost reaches soft lignite) containing relatively high ash and gel substances . Background technique [0002] my country is rich in lignite resources, accounting for about 13% of the country's total coal resources, mainly distributed in eastern Inner Mongolia, eastern Yunnan, northeast and southern China, and a small amount. At present, the main industrial uses of lignite are fuel for power generation, quality improvement, extraction of montan wax, humic acid, etc. Because lignite contains more water, is easy to weather and crack, and has high volatile content, the thermal stability and mechanical strength of lignite lump coal are very poor, and the molding of lignite is more difficult than that of anthracite, so the use and market of lignite are limited. [0003] Coal briquettes ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/14
Inventor 张宗凡董芸李艳平张星吴冉李冬丽
Owner YUNNAN CHEM RES INST
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