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Production method for brown coal binding and forming

A production method and a technology for lignite, which are applied in the field of preparation of lignite briquette, can solve the problems of limiting the scope of use of low-rank lignite briquette, influence of molding equipment or process, and high cost of binder, and achieve high drop strength and high moisture content. , The effect of not easy to raise dust

Inactive Publication Date: 2015-02-18
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of binder in the lignite molding process with binder is high, and the addition of some binders will affect the molding equipment or process, thus limiting the scope of use of low-rank lignite briquettes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 The lignite block is crushed and screened to a particle size of ≤3mm, and a binder of 25% of the coal mass is added. The binder is polyvinyl alcohol: carboxymethyl cellulose: water glass: water in a mass ratio of 1:0.4:8:40 Mix and stir at 60°C for about 30 minutes. Stir the binder and lignite powder evenly, and control the molding moisture to 42%, and then send it to a screw extrusion coal rod machine for extrusion molding. The obtained coal rods are dried by airflow at 60-120°C for 8 hours to obtain briquettes. It is tested that the coal stick has a water content of 8.2%, a drop strength of 86.9%, and a thermal stability of 87.8%.

Embodiment 2

[0034] Example 2 The lignite block is crushed and screened to a particle size of ≤3mm, and a binder of 35% of the coal mass is added. The binder is polyvinyl alcohol: carboxymethyl cellulose: water glass: water in a mass ratio of 1:1:12:60 Mix and stir at 90°C for about 30 minutes. Stir the binder and lignite powder evenly, and control the molding moisture to 45%, then send it to a screw extrusion coal rod machine for extrusion molding, and the obtained coal rods are dried by airflow at 60-120°C for 8 hours to obtain briquettes. It is tested that the coal stick has a water content of 9.5%, a drop strength of 93.5%, and a thermal stability of 90.8%.

Embodiment 3

[0035] Example 3 Crush and sieve the lignite block to a particle size of ≤3mm, add a binder of 18% of the coal mass, the binder is polyvinyl alcohol: carboxymethyl cellulose: water glass: water in a mass ratio of 1:0.8:2:30 Mix and stir at 50°C for about 30 minutes. Stir the binder and lignite powder evenly, and control the molding moisture to 38%, and then send it to a screw extrusion coal rod machine for extrusion molding, and the obtained coal rods are dried by airflow at 60-120°C for 8 hours to obtain briquettes. It is tested that the coal stick has a water content of 6.7%, a drop strength of 89.9%, and a thermal stability of 85.8%.

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Abstract

The invention discloses a production method for brown coal binding and forming, and relates to a binding agent suitable for low-order brown coal forming and a preparation method of the coal briquette. The method comprises the following steps: (1) crushing and screening the brown coal block until the size is smaller than or equal to 3 mm; (2) dissolving polyvinyl alcohol, carboxymethyl cellulose and sodium silicate into water according to a certain ratio, and preparing a composite binding agent; (3) adding the binding agent according to a certain proportion to the brown coal raw material, stirring uniformly, and then conducting cold extrusion forming in a coal rod extrusion machine; (4) drying the formed coal rod at the temperature of 60-120 DEG C until the moisture is smaller than 10% so as to obtain the coal briquette product. The production method disclosed by the invention is simple in technology; the binding agent is wide in source, convenient to prepare, and low in cost; the coal briquette product is high in cold intensity and heat intensity both, can substitute lump coal to be supplied to a gas generator, and further can meet the requirements on the granularity and the strength for the synthesis ammonia gas-making section.

Description

technical field [0001] The invention relates to the field of lignite briquette preparation, in particular to a binder suitable for forming low-rank lignite and a method for preparing briquette. 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. Because lignite has high water content, high ash content, low calorific value, easy weathering and cracking, and the molding of lignite is difficult, the use and market of lignite are limited. At present, the main industrial uses of lignite are fuel for power generation, quality improvement, extraction of montan wax, humic acid, etc. [0003] Briquette is made of pulverized coal and processed into coal products with certain strength and shape according to industrial needs. Briquette can improve the combustion efficiency of coal, reduce envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/14C10L5/12
Inventor 李艳平吴冉张星董芸
Owner YUNNAN CHEM RES INST
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