Propylene guard bed system and propylene delivery method

Abstract

The invention discloses a propylene guard bed system and a propylene delivery method. The guard bed body of the propylene guard bed system includes a bed body inlet and a bed body outlet; the propylene feed line and the bed body inlet are in fluid communication and the propylene feed line and the bed body A first valve for controlling fluid on-off is provided between the inlets; the propylene discharge line is in fluid communication with the bed body outlet and a third valve for controlling fluid on-off is provided between the propylene discharge line and the bed body outlet; The first cooling inlet of the cooler is in fluid communication with the bed outlet, the first cooling outlet of the first cooler is in fluid communication with the pump inlet of the propylene delivery pump, the pump outlet of the propylene delivery pump is in fluid communication with the bed inlet, and the first cooling inlet A fifth valve for controlling fluid on-off is arranged between the outlet of the bed and the bed body. The propylene guard bed system of the present invention can effectively reduce the heat of adsorption generated when the liquid-phase propylene enters, thereby avoiding the risk of overpressure caused by the heat of adsorption.

Description

technical field [0001] The invention relates to the petrochemical field, in particular to a propylene guard bed system and a propylene delivery method. Background technique [0002] The function of the propylene guard bed system is to remove methanol, dimethyl ether and other oxides in the propylene product. The inlet and outlet of the propylene guard bed system are respectively equipped with online analyzers to analyze the import and export of methanol, ethylene, ethane, Substances such as propane and dimethyl ether. The propylene guard bed system includes two guard beds. When one guard bed is in normal operation, the other guard bed is used for standby or regeneration. The regeneration period is 48 hours. Once the presence of oxides is found at the outlet of the guard bed, the feed is immediately cut into another guard bed after new / regenerated. When the guard bed has been regenerated and put back into service, it must be cooled to as close to normal operating temperatur...

AI Technical Summary

Problems solved by technology

[0003] However, there are still the following problems in the above-mentioned liquid-filled standby process: when the regenerated propylene guard bed system is filled with liquid for the first time, the liquid-phase propylene will generate heat of adsorption after entering the guard bed, and the temperature of the whole guard bed begins to rise. The propylene is partially gasified, and the operator needs to open the pressure relief valve in time to release the pressure. If the pressure is not released, the temperature of the guard bed will rise rapidly, and the pressure will rise rapidly, and there is a risk of overpressure

In addition, during the pressure relief process, if the pressure is released to the flare system, a large amount of propylene will be wasted, and if the pressure is released to the front system, the amount of relief is limited when the current system is running at full capacity, which may easily cause overpressure in the propylene guard bed system

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