Large fluidized bed system and device for drying and upgrading lignite

Abstract

The invention relates to a fluidized bed system for grading, drying and upgrading lignite. The fluidized bed system comprises a fluidized bed, coal-burning hot air furnaces and a hot air recycling system, and the hot air recycling system hermetically connects the coal-burning hot air furnace with the fluidized bed. The fluidized bed system is characterized in that broken lignite entering the fluidized bed is divided into upgrading coal granules and fine coal powder, the fine coal powder is sent into the coal-burning hot air furnaces for burning to provide heat for the fluidized bed system, the fluidized bed system further comprises a lignite grading and upgrading system, and the upgrading coal granules are graded according to granular size in the fluidized bed under action of the lignite grading and upgrading system and subjected to upgrading of different degrees according to difference in granular size of the coal granules. By the fluidized bed system, industrialized grading, drying and upgrading of lignite can be realized, and utilization rate of lignite is increased.

Description

technical field [0001] The invention relates to a large-scale lignite drying and upgrading fluidized bed system and device Background technique [0002] Today, my country's energy is still dominated by coal, and has become the world's largest coal-producing country. In the next few decades, the sustainable development of my country's economy will continue to rely on coal to provide the main energy support. But at present, the mining and utilization of coal resources in our country are mainly bituminous coal and anthracite, and the mining and utilization level of lignite is very low. With the continuous increase of my country's energy demand and the excessive exploitation of bituminous coal and anthracite resources, the development and utilization of lignite will become more and more important. Compared with bituminous coal and anthracite, lignite has the advantages of lower price and high reactivity, but its calorific value is relatively low and its water content is high. ...

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Problems solved by technology

[0004] CN201753345U discloses a kind of superheated steam enhanced circulation graded pulverization and upgrading system of lignite, which includes a feed system, the feed system is respectively connected with a high-temperature flue gas generating device and a winnowing drying device, wherein the high-temperature flue gas generating device outlet is connected to the wind The air outlet of the wind separation drying device is connected with the separation dust removal device, the exhaust gas outlet of the separation dust removal device is connected with the emptying device and the circulation system, and the circulation system is respectively connected with the high temperature flue gas generating device and the wind separation device. The device is also connected with at least one pulverizing ventilation device. Although the prior art has disclosed the use of wind to classify lignite, it does not describe the specific particle size and processing speed of different particles, so as to provide an integrated device for lignite drying, upgrading and grading

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