A vapor-liquid separation system and process and application of low-temperature methanol washing gas medium

Abstract

The disclosure provides a vapor-liquid separation system, process and application of low-temperature methanol washing gas medium. The system includes a primary separation device, a secondary separation device, a first evaporator, a second evaporator, and a recovery pump; The separation device is an enlarged diameter pipe, which is a pipe with a larger diameter than the inlet pipe of the primary separation device, and a liquid separation port is provided at the bottom of the enlarged diameter pipe; the secondary separation device is a device for realizing vapor-liquid separation; low-temperature methanol washes the gas The discharge pipe of the medium is connected to the inlet of the first-stage separation device, and the pipeline outlet of the first-stage separation device is connected to the inlet of the second-stage separation device through a medium pipeline. The installation position of the second-stage separation device is higher than the inlet of the compressor. Connect the inlet of the first evaporator, the gas phase outlet of the first evaporator is connected with the medium pipeline, the liquid outlet of the secondary separation device is connected with the inlet of the second evaporator, the gas phase outlet of the second evaporator is connected with the medium pipeline, the second The drain port of the evaporator is connected to the inlet of the recovery pump.

Description

technical field [0001] The disclosure belongs to the technical field of synthetic ammonia, and relates to the separation technology of an intake medium of a low-temperature methanol-washed centrifugal ammonia compressor in synthetic ammonia chemical production, and specifically relates to a vapor-liquid separation system, process and application of a low-temperature methanol-washed intake medium. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Synthetic ammonia requires desulfurization and decarbonization purification processes. The low-temperature methanol washing process uses low-temperature methanol as a solvent, which has high selectivity to carbon dioxide, hydrogen sulfide and COS. Therefore, more and more low-temperature methanol washing processes are used in the synthetic ammonia process. Purification process. The low-pressure cylinder of...

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Problems solved by technology

[0004] The compression medium of the compressor unit in the existing synthetic ammonia production requires vapor-liquid separation, and then the separated compression medium is transported to the compressor. There is a big difference in the effect. The separated liquid cannot be effectively used and discharged, resulting in a high liquid level in the separator, and the liquid pump cannot be put into operation in time due to negative pressure and low temperature, resulting in the occurrence of gas with liquid affecting the operation of the unit, and frequent production adjustments. Often, the operation period of the unit is short and the maintenance cost is high, which leads to the inability of continuous and effective operation of the production and low economic benefits

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