Lignite drying, sloshing dust-removing and washing process

Abstract

The invention relates to a lignite drying, sloshing dust-removing and washing process which comprises the steps: wet pulverized coal enters a drying machine through a feeding belt for drying, drying hot steam enters from a rotary joint at a discharging end of the drying machine and enters a heat exchange pipe after passing through a steam chamber, the wet pulverized coal is in contact with a steam pipe for exchanging heat and drying, and a dried product is discharged from a discharging hole and conveyed to the next section through a discharging belt; condensed water generated by steam heat exchange enters a condensed liquid tank through the rotary joint and is conveyed to the next section through a condensation liquid pump; the tail gas generated in the drying process is subjected to primary dedusting in a discharging box arranged on the tail part of the drying machine and is discharged from the top of a discharging box and then enters a sloshing dust remover; washed waste liquid is discharged from the bottom of the sloshing dust remover, and waste liquid discharged by the sloshing dust remover is conveyed by adopting a sewage pump. Materials are dried by adopting steam latent heat, dried tail gas is washed through gravity settling and sloshing dust-removing, the tail gas is ensured to reach the standard for emission, and dangers of firing and exploding during dry-method dust removing are avoided.

Description

technical field [0001] The invention relates to the technical field of lignite drying, which is a high-moisture lignite drying process using impulse dust removal and washing, and can also be used for drying other pulverized coals. [0002] Properties of lignite [0003] 1. Lignite is a high-moisture, high-volatile coal that must be dried before it can be used as fuel. [0004] 2. The moisture content of lignite is high, the particle size of raw coal after crushing is large, and the drying time required is long; the volatile content of lignite is high, and the volatile content of lignite will be lost after long-term high-temperature drying, reducing the effective components, and spontaneous combustion will occur in severe cases . [0005] 3. The moisture to be removed in the lignite drying process is water, but the drying process will produce some volatile matter and dust. Lignite is a flammable and explosive medium, so the dryer must be airtight. [0006] 4. The tail gas af...

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Problems solved by technology

There is no technology and equipment successfully applied to lignite drying in our country

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