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Brown coal drying quality-increasing device and technique

A drying device, technology of lignite

Inactive Publication Date: 2008-09-10
TSINGHUA UNIV
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Problems solved by technology

[0005] The object of the present invention is to provide a stable and efficient lignite drying and upgrading device and process method, that is, to dry lignite in situ and extract part of the volatile matter and tar process to solve the lignite combustion problem caused by local overheating during the drying process, and at the same time make the system easy to operate, good controllability and stable operation

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  • Brown coal drying quality-increasing device and technique
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Embodiment Construction

[0020] figure 1 It is a schematic diagram of the structure and process flow of the lignite drying and upgrading device. The device comprises a coal bunker 1, a drying device 2, a pyrolysis device 3, a combustion device 4 and a dehydration device 8, and the drying device is connected with the coal bunker and the pyrolysis device 3 respectively, and the dehydration device 8 is arranged on the combustion device 4 and the pyrolysis device 3, the drying device is divided into two parts, the flue gas drying chamber and the steam drying chamber. Connect with the steam outlet of the combustion device through the steam pipe.

[0021] The technological process and working principle of the present invention are as follows: the lignite is transported from the silo 1 to the drying device 2, and the moisture is removed under the separate heating of hot flue gas at a temperature of 100-150°C and steam at a temperature of 200-220°C. The dried lignite is sent into the fluidized bed pyrolysis...

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Abstract

A drying and upgrading device for lignite and a technological method thereof, relating to the lignite efficient utilization field. The invention comprises a chamber dryer for the lignite, a fluidized-bed pyrolysis device, a combustion device for the pyrolysed gas, and other adjuvant devices. The dried lignite is fed into the pyrolysis device, volatiles and liquid products are extracted, the volatiles are sent into the combustion device to be burnt to generate fume and steam, the fume and a part of the steam are sent into the drying device to serve as the drying media. The rest steam is sent into the pyrolysis device to provide the heat source for the pyrolysis. A chain conveying method and a method of chamber drying / discharge of the fume and the steam are adopted for the drying device. Two different steams with different temperatures are generated in the combustion device and used for drying and pyrolysis of the lignite respectively. Compared with the prior technology, the device and the method provided by the invention have the advantages of safe and reliable operation, reasonable design, steady running in the large-scale application, and capability of improving the comprehensive utilization rate of the lignite.

Description

technical field [0001] The invention relates to a lignite upgrading process, which belongs to the field of high-efficiency coal utilization. Background technique [0002] Lignite reserves account for about 15% of my country's total coal reserves. It is one of my country's main coal resources and plays an important role in my country's power and chemical coal. Lignite is a kind of coal with low degree of coalification in the underground storage period. Its moisture and ash content are relatively high, and the moisture content is mostly 20%-50%. Lignite is mainly distributed in Inner Mongolia, Heilongjiang, Yunnan, Xinjiang and other places. Due to economic development, the coal consumption in these areas is less than that in economically developed areas. Therefore, lignite needs to be transported to a relatively distant utilization site. Due to the presence of high moisture content in lignite, the railway system is extremely wasteful. Lignite upgrading is the process of ...

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Application Information

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IPC IPC(8): C10B57/10C10L9/00F26B3/00
Inventor 由长福
Owner TSINGHUA UNIV
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