Non-direct contact lignite drying device and drying process

Abstract

The invention discloses a non-direct contact lignite drying device. The non-direct contact lignite drying device comprises an incinerator, a drying box, a smoke purifying system and a chimney, whereina smoke outlet of the incinerator is connected with an air inlet of the drying box; an air outlet of the drying box is connected with the smoke purifying system; a lignite conveying mechanism is arranged inside the drying box; the conveying direction of lignite is opposite to the flowing direction of smoke inside the drying box; the lignite makes non-direct contact with smoke in the drying box; the outlet end of the smoke purifying system is divided into two air paths; one of the air paths is connected with the chimney through an induced draft fan; and the other air path is connected with a pipeline through a return fan, and the pipeline is connected with the incinerator and the drying box. The lignite with high moisture content is continuously supplied into the drying box to be dried, the mode of non-direct contact with smoke is adopted in the drying process, the smoke temperature can be effectively adjusted according to the moisture content of the lignite and the handling capacity,and accordingly the lignite drying efficiency, quality and safety are improved.

Description

technical field [0001] The invention belongs to the technical fields of coal chemical industry and electric power, and in particular relates to a non-direct contact lignite drying device and a drying process. Background technique [0002] Lignite has huge reserves all over the world and its price is relatively low, so it is often used as raw material or fuel in the field of coal chemical industry or power plants. ), low calorific value, and difficult to utilize, so lignite needs to be dried. [0003] The existing lignite drying process mainly has the following problems: 1. The moisture in the lignite is still high after drying; 2. The lignite is prone to spontaneous combustion during the drying process; 3. The drying process has limited processing capacity and often requires Multiple drying lines are arranged in parallel; 4. When the water content of lignite changes greatly, it is difficult to adjust the drying process; 5. The exhaust gas generated during the drying process...

AI Technical Summary

Problems solved by technology

[0002] Lignite has huge reserves all over the world and its price is relatively low, so it is often used as raw material or fuel in the coal chemical industry or power plants. ), low calorific value, and difficult to utilize, so lignite needs to be dried

[0003] The existing lignite drying process mainly has the following problems: 1. The moisture in the lignite is still high after drying; 2. The lignite is prone to spontaneous combustion during the drying process; 3. The drying process has limited processing capacity and often requires Multiple drying lines are arranged in parallel; 4. When the water content of lignite changes greatly, it is difficult to adjust the drying process; 5. The exhaust gas generated during the drying process is directly discharged into the atmosphere, which has an impact on the environment

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