System device for drying lignite by superheated steam

Abstract

The invention discloses a system device for drying lignite by superheated steam. The system device includes that a superheated steam pipe is connected to a fluidifying bed and is divided into two branches: one of the branches is serially connected to an electric dust collecting device and a safety door through a pipeline, and the other branch is sequentially serially connected to a primary heat exchange unit and a secondary heat exchange unit. An outlet of the secondary heat exchange unit is sequentially serially connected with a first cooler and a second cooler through a pipeline, and a water pump heat exchanger is connected at the tail end of the second cooler. Superheated steam flows through the electric dust collecting device and is divided into two branches: one branch is connected to the fluidifying bed after being sequentially serially connected to a heat source side of a circulating fan and a steam distributor; and the other branch is connected to the primary heat exchange unit through a steam compressor. The system device has the advantages of low energy consumption and high drying efficiency, is particularly applicable to long-distance delivery of coals and coal briquette processing and has wide application prospect in various fields of coal pyrolysis chemical industry, blast-furnace injection metallurgy application, coal firing power plants, coal slime, civil sludge and the like.

Description

technical field [0001] The invention belongs to heat utilization drying technology, in particular to a system device for drying lignite by using superheated steam. Background technique [0002] Drying is an energy-intensive industry. There are many problems in drying lignite with hot flue gas and hot air, such as: easy to catch fire and even explode; large initial equipment investment, large floor area; high energy consumption, etc. Lignite has disadvantages such as high humidity (up to 30-50%), low calorific value, low ignition point, and large carbon dioxide emissions. Direct combustion of unupgraded lignite raw coal will cause serious environmental pollution and increase construction and operation costs. cost. At the same time, the higher water content leads to an increase in the transportation cost of lignite, which limits the space for overseas transportation. [0003] Therefore, how to carry out research on drying, humidity control and quality upgrading technologies...

AI Technical Summary

Problems solved by technology

There are many problems in drying lignite with hot flue gas and hot air, such as: easy to catch fire and even explode; large initial equipment investment, large floor area; high energy consumption, etc.

Lignite has disadvantages such as high humidity (up to 30-50%), low calorific value, low ignition point, and large carbon dioxide emissions. Direct combustion of unupgraded lignite raw coal will cause serious environmental pollution and increase construction and operation costs. cost

At the same time, the higher water content leads to an increase in lignite transportation costs, which limits the space for outbound transportation

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