Gas-liquid separating device of low-temperature methanol washing absorption tower

Abstract

The invention provides a gas-liquid separating device of a low-temperature methanol washing absorption tower. The gas-liquid separating device of the low-temperature methanol washing absorption tower comprises the absorption tower, wherein a gas-liquid separator is arranged at a process gas-phase outlet of the absorption tower; a demister is arranged in the gas-liquid separator; the upper end of the gas-liquid separator is connected with a liquid nitrogen wash unit, and the lower end of the gas-liquid separator is connected with a low-temperature solution system; a liquid level meter is arranged on the side of the gas-liquid separator; and a pressure gauge is arranged on a pipe line where the absorption tower is connected to the gas-liquid separator. After the low-temperature methanol is processed by the gas-liquid separating device provided by the invention, the safety of a follow-up system can be ensured, so that an entire synthetic ammonia plant can stably operate in long term; and at the same time, the separated liquid methanol can be recycled after being subjected to low temperature treatment, so that waste and environmental pollution can be reduced.

Description

technical field [0001] The present invention relates to a low-temperature methanol washing absorption tower, in particular to a gas-liquid separation device for a low-temperature methanol washing absorption tower. [0002] Background technique [0003] The ammonia synthesis process using coal as raw material includes several stages of gas production, conversion, purification, synthesis and separation. In the purification section, low-temperature methanol washing can be used to remove CO in the raw gas 2 and H 2 S removed. [0004] Low-temperature methanol washing is a gas purification process jointly developed by German Linde Company and Lurgi Company in the early 1950s. This process uses cold methanol as the absorption solvent and utilizes the excellent characteristics of methanol's great solubility to acid gases at low temperatures , to remove the acid gas in the raw gas. The gas purification degree of this process is high, and the selectivity is good, and the desu...

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Problems solved by technology

[0010] Beneficial effects of the invention: a gas-liquid separator is installed at the outlet of the gas phase of the low-temperature methanol washing absorption tower to effectively remove liquid methanol, which solves the problem that the gas phase of the absorption tower occurs in the system The problem of methanol being taken out under fluctuations or accidents ensures the safety of the follow-up system and enables the entire ammonia synthesis plant to run stably and for a long period of time

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