Lignite drying and pyrolyzing device

Abstract

The invention discloses a lignite drying and pyrolyzing device. The device comprises a drying fluidized bed barrel and a pyrolyzing fluidized bed barrel, wherein a coal falling pipe is arranged at the bottom of the drying fluidized bed barrel and communicated with a material returning mechanism; the material returning mechanism is communicated with the pyrolyzing fluidized bed barrel through a transmission pipe; at least one stage of cyclone separator is arranged in the pyrolyzing fluidized bed barrel; the outlet of the last stage of cyclone separator is communicated with a coal gas outlet pipe of the pyrolyzing fluidized bed barrel; the coal gas outlet pipe is communicated with a first electrical tar precipitator; the first electrical tar precipitator is communicated with a primary condenser; and the primary condenser is communicated with the bottom of the drying fluidized bed barrel through a first fan. By the device, the phenomenon that a pipe is blocked in the process of discharging tar is avoided, a heat source can be recycled, the utilization efficiency of heat energy is improved, energy consumption in the process of pyrolyzing coal is reduced, and the production cost of pyrolyzing the coal is reduced.

Description

Technical field [0001] The invention relates to the field of coal pyrolysis, in particular to a lignite drying pyrolysis device. Background technique [0002] As an important energy source, coal generally needs to be converted to coal in the prior art to improve its utilization efficiency. Among them, the coal pyrolysis process is an important process for coal conversion. The hydrogen-rich components in the coal are reduced under relative temperature and conditions. Extracted with liquid and gas, benzene, naphthalene, anthracene, phenanthrene, and a variety of fused-ring aromatic hydrocarbon compounds and heterocyclic compounds that cannot be synthesized artificially can be obtained at the same time, which improves the utilization rate of coal. During the process of coal pyrolysis, a large amount of tar will be produced. As the temperature gradually decreases during the process of exporting the tar, the tar will gradually condense and even solidify on the export pipe. The gradual...

AI Technical Summary

Problems solved by technology

A large amount of tar will be produced in the process of coal pyrolysis. In the process of exporting the tar, as the temperature gradually decreases, the tar will gradually condense, and even solidify on the outlet pipe. The gradual accumulation will cause the outlet pipe to be blocked, causing safety hazards and reducing coal heat. The stability of the solution process

In the prior art, the high-temperature gas generated after coal pyrolysis is directly discharged to the outside after being adsorbed, which wastes a lot of heat energy and reduces the utilization efficiency of heat energy

In addition, in the actual production process, a high-temperature gas-solid separator needs to be installed outside the reactor, and the separator needs to be additionally heated to avoid condensation of heavy tar, which increases production costs and occupies a large space

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