A kind of coal pyrolysis gas dry purification, cracking and fraction recovery device and process

Abstract

The invention discloses a dry process purifying, cracking and fraction recovering device of a coal pyrolysis gas. The device comprises a lower catalytic bed, an upper catalytic bed and a compound fractionating tower. The lower catalytic bed is divided into a dust-removing region and a catalytic region; the dust-removing region and the catalytic region are separated by a ventilation baffle plate; the dust-removing region is connected to an inlet pipe of the coal pyrolysis gas; the catalytic region is connected to the upper catalytic bed through a first coal gas pipeline; and the upper catalytic bed is connected to the compound fractionating tower through a second coal gas pipeline. A raw coke oven gas from a coal medium-low temperature gas retort or coke oven enters the lower catalytic bed and the upper catalytic bed in sequence; the temperature of the catalytic bed is guaranteed not lower than the temperature of pyrolysis coal gas by utilizing physical sensible heat carried by the coal gas and heat released by a catalyst regeneration process; the dust-removing and cracking process of the pyrolysis coal gas without reducing the temperature; then cracking components enters the compound fractionating tower; and the cracking components are fractionated in the compound fractionating tower, and thus components such as clean coal gas, light oil, carbolic oil, naphthalene oil, anthracene oil and asphalt can be obtained.

Description

technical field [0001] The present invention relates to a coal pyrolysis gas treatment device and process, in particular to a dry purification, catalytic cracking and fraction recovery device for coal pyrolysis gas (especially medium and low temperature dry distillation gas or raw coke oven gas) and craft. Background technique [0002] Medium and low temperature dry distillation usually refers to the process of coal being heated at 500-800 ° C, isolated from air, and thermally decomposed to produce semi-coke, coal tar, and gas. The temperature of high-temperature dry distillation (coking) is above 900°C, and its products are coke, high-temperature coal tar and gas. The current gas treatment process is to spray and cool the gas with ammonia water first, and recover the dusty coal tar (the sensible heat carried by the gas is wasted, and at the same time, it causes waste water pollution. The dust in the coal tar makes its use value low, and the process is still very complicate...

AI Technical Summary

Problems solved by technology

The current gas treatment process is to spray and cool the gas with ammonia water first, and recover the dusty coal tar (the sensible heat carried by the gas is wasted, and at the same time, it causes waste water pollution. The dust in the coal tar makes its use value low, and the process is still very complicated)

Then it is sent to a coal tar processing plant, reheated for rectification, and the fractions are separated (tar reheating, waste of energy, large investment)

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