Propylene compressor start-up dry sealing gas intake system

Abstract

The invention discloses a propylene compressor start-up dry sealing gas intake system. The propylene compressor start-up dry sealing gas intake system comprises a propylene compressor start-up dry sealing gas intake pipe and a propylene compressor start-up dry sealing gas intake valve, as well as a propylene separator, a propylene liquid pump and a propylene vaporizer, wherein a liquid outlet formed in the bottom end of the propylene separator is connected with the propylene liquid pump by use of a pipeline; the outlet of the propylene liquid pump is connected with the cold side inlet of the propylene vaporizer; the hot side outlet of the propylene vaporizer is connected with the propylene compressor start-up dry sealing gas intake valve by use of a pipeline; the hot side inlet of the propylene vaporizer is connected with a saturated steam pipe. According to the propylene compressor start-up dry sealing gas intake system, the propylene gas, which is obtained by pressurizing the liquid-state propylene, separated out by the propylene separator, by use of the propylene liquid pump, and then vaporizing the pressurized liquid-state propylene, is taken as the dry sealing gas for a propylene compressor at the moment of start-up and is safe; besides, evacuation can be avoided, the waste of the propylene can be reduced and the cost can be saved.

Description

technical field [0001] The invention relates to a dry gas sealing gas intake system for starting a propylene compressor, which belongs to the technical field of chemical industry. Background technique [0002] When the propylene compressor is running, the dry gas seal is divided into a primary air seal and a secondary seal. The primary seal acts as the main seal and requires a high pressure. Generally, the unit uses the outlet gas, and some of it has to enter the unit. The secondary is mainly to prevent the primary seal. If the seal is not good, it may play a secondary protective role, and it can also prevent the sealing gas from polluting the sealing end face. Nitrogen is generally used. However, when the propylene compressor is turned on, nitrogen (which requires a certain pressure) is generally used as the sealing gas, which will still cause nitrogen to enter the propylene system, resulting in excessive pressure, which needs to be vented, and a large amount of propylene g...

AI Technical Summary

Problems solved by technology

However, when the propylene compressor is turned on, nitrogen (needs a certain pressure) is generally used as the sealing gas, which will still cause nitrogen to enter the propylene system, resulting in excessive pressure, which needs to be vented, and a large amount of propylene gas will be lost.

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