Method and device for controlling naphthalene content in regenerated gas

Abstract

The invention discloses a method and a device for controlling naphthalene content in regenerated gas. According to the method, regenerated gas is used for alternately carrying out hot blowing and coldblowing on an adsorption tower, so that naphthalene on an adsorbent in the adsorption tower is desorbed and enters the regenerated gas, and the adsorbent is regenerated. In the hot blowing process, regenerated gas with a peak content of naphthalene reaching 7000-8000mg / Nm<3> flows out of the adsorption tower, the content of naphthalene in the regenerated gas can be effectively reduced through cooling of a cooler and the bypass regenerated gas, and the regenerated gas with a high naphthalene content is conveyed to a final user through a gas conveying pipeline of the final user. In the cold blowing process, the naphthalene content in the regenerated gas flowing out of the adsorption tower is smaller than 1mg / Nm<3>, and the regenerated gas is heated by a heater and then enters a gas conveying main pipe of the final user, so that naphthalene crystallized in a pipeline in the hot blowing process can be sublimated again. The temperature of regenerated gas reaching the final user can be smaller than or equal to 50DEG C, the naphthalene content is smaller than or equal to 530mg / Nm<3>, pipeline blockage caused by naphthalene crystallization in the pipeline can be avoided, and stable operation of the pipeline and equipment is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of recycling and harmless treatment of regenerated gas from naphthalene removal by dry method, and in particular relates to a method and device for controlling naphthalene content in regenerated gas. Background technique [0002] my country has abundant reserves of coal resources, and it is difficult to change the pattern of using coal as the main energy source. Coke oven gas is a by-product of the coking process of iron and steel complexes, and the amount of coking produced every year is very large. In addition to returning to the furnace for self-use, power generation, and chemical utilization (such as production of methanol and synthetic ammonia), the comprehensive utilization of a large amount of surplus coke oven gas has become considerable. urgent. The construction and commissioning of a series of projects such as methanol from coke oven gas, hydrogen extraction from coke oven gas, and natural gas fro...

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Problems solved by technology

[0008] The object of the present invention is to provide a method and device for controlling the naphthalene content in the regeneration gas, so that when the regeneration gas reaches the end user, the naphthalene content in the regeneration gas is uniform and stable, that is, the naphthalene content is less than or equal to 530mg / Nm 3 , temperature ≤ 50°C; at the same time, solve the problem of pipeline blockage caused by the crystallization of naphthalene in the pipeline during the transportation process, and ensure the stable operation of downstream pipelines and equipment

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