Drying and water-recovering process of heat conduction coal by venturi injecting circulation of tail gas with low oxygen content

Abstract

The invention discloses a drying and water-recovering process of heat conduction coal by venturi injecting circulation of tail gas with low oxygen content. The process flow comprises: 1, a coal drying system; 2, a tail gas dust-removal and condensed dehydration system; 3, a circulation gas pre-heating and heating system; and 4, a circulation gas oxygen-content-controlling system. In the process, all systems can cooperate with one another to fully realize respective functions, so that the problem that the system fails to operate for a long period because the high-dew-point dust-contained tail gas entering a dry-process dust collector (cyclone separator, bag type dust collector and electrostatic precipitator) is susceptible to dewing and blocking the dust collector in the traditional inert gas circulation drying process is solved, and the continuous long period operation of the system is guaranteed. The process has the characteristics of energy conservation, environmental protection andsafety.

Description

technical field [0001] The invention relates to coal treatment, in particular to a heat conduction drying of coal, low oxygen content tail gas circulation and evaporation water recovery technology, which has the characteristics of energy saving, environmental protection and safety. Background technique [0002] The equipment currently used for coal drying mainly includes: [0003] (1) Rotary drum dryer, which is easy to adjust, has small moisture fluctuations, reliable operation, and low power consumption, but has low production capacity, low volumetric evaporation intensity, heavy equipment, and a large floor area. [0004] (2) Airflow dryer, which has a large production capacity per unit volume, a simple structure, and a small footprint, but it has strict operation and particle size control, high power consumption, easy wear and tear of equipment, and the risk of dust explosion. [0005] (3) Fluidized bed dryer, which has a large production capacity per unit volume, simpl...

AI Technical Summary

Problems solved by technology

The present invention optimizes and combines traditional conventional equipment to form Venturi injection low-oxygen tail gas circulation heat conduction briquette drying and water recovery technology, which solves the problem of dew condensation and blockage caused by dry dust removal in traditional tail gas treatment methods. The drying system cannot run continuously and stably; wet dust removal will cause difficulties in the separation of coal and water in the washing liquid, and the separation of coal slime requires secondary treatment

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