Non-bonder forming method for lignite

A binder-free, forming method technology, applied in the petroleum industry, solid fuel, fuel, etc., can solve problems such as inability to judge coal briquettes, influence of equipment or process, limit the use range of briquettes, and meet transportation and industrial applications Requirements, mild molding temperature, avoiding the impact of coal cost and application range

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

Although the binder molding process of lignite can obtain briquettes with higher strength, the cost is higher
In addition, the addition of binders will also affect some equipment or processes that use briquettes, thus limiting the scope of use of briquettes
Lignite binder-free molding can obviously avoid the above disadvantages, but at present, the patents of lignite binder-free molding in my country generally require higher molding temperature, generally greater than or equal to 80°C, and have little effect on the cold and hot strength of the molded coal It is mentioned that the quality of the obtained briquette products cannot be judged from the data

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The lignite raw material is dried at 80°C, crushed and sieved to a particle size of less than 5mm, and the sieved lignite is secondarily dried to a moisture content between 10% and 20%. The secondary dried coal powder is put into the mold and preheated to 30°C, and hydraulically formed at a pressure of 180MPa. The cold drop strength of the formed coal is 90%. The formed briquettes were dried at 80°C for 4 hours. It was detected that the moisture content of the briquettes was 3.1%, the thermal drop strength was 95%, and the thermal stability (>13mm) was 85%.

Embodiment 2

[0032] The lignite raw material is dried at 80°C, crushed and sieved to a particle size of less than 5mm, and the sieved lignite is secondarily dried to a moisture content between 5% and 10%. The secondary dried coal powder is put into the mold and preheated to 40°C, and hydraulically formed at a pressure of 150MPa. The cold drop strength of the molded coal is 91%. The molded coal was dried at 100°C for 1 hour. It was detected that the moisture content of the molded coal was 4.9%, the thermal drop strength was 95%, and the thermal stability (>13mm) was 86%.

Embodiment 3

[0034] The lignite raw material is dried at 80°C, crushed and sieved to a particle size of less than 5mm, and the sieved lignite is secondarily dried to a moisture content between 8% and 15%. The secondary dried coal powder is put into the mold and preheated to 60°C, and hydraulically formed at a pressure of 50MPa. The cold drop strength of the molded coal is 90%. The formed briquettes were dried at 50°C for 6 hours. It was detected that the moisture content of the briquettes was 3.7%, the thermal drop strength was 92%, and the thermal stability (>13mm) was 83%.

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Abstract

The invention discloses a non-bonder forming method for lignite, which belongs to processing and utilization technologies for lignite, relates to a forming method for lignite, and in particular to a forming method for weak lignite containing a high ash content and gel substances. The forming method disclosed by the invention is performed according to the following steps: (1) screening out lignite with a particle size of 0-5 mm by sieving, and drying the lignite until the water content is 5-30%; (2) preheating the dried lignite to 30-60 DEG C, and hydraulically forming the preheated lignite under 50-180 MPa; and (3) drying the formed lignite again for 1.0-6.0 hours at 50-100 DEG C to obtain a final briquette coal product. According to the forming method disclosed by the invention, the purpose of non-bonder forming for middle-aged and old lignite, in particular, weak lignite is realized; moreover, the obtained lignite is very high in cold and heat intensity, and the industrialized application range of low-value lignite is expanded.

Description

technical field [0001] The invention belongs to lignite processing and utilization technology, and relates to a lignite molding method, in particular to a lignite molding method suitable for lignite containing relatively high ash and gel substances. Background technique [0002] my country is rich in lignite resources, mainly distributed in northeast Inner Mongolia Dongsimeng, Yunnan, Hainan and other provinces. At present, the main industrial uses of lignite are power generation, heat supply, gasification molding, and extraction of lignite wax and humic acid. Lignite molding is an important measure to broaden the use of lignite. Because lignite contains more water, is easy to weather and crack, has high volatile content, and has poor thermal stability and mechanical strength, the molding of lignite is more difficult than that of anthracite. [0003] my country has started the research on pulverized coal molding technology since the 1950s. So far, what my country has deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/08
Inventor 张宗凡董芸李冬丽李艳平张星
Owner YUNNAN CHEM RES INST
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