Propylene guard bed system and propylene delivery method

Abstract

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

Description

Technical field [0001] The present invention relates to the petrochemical field, in particular to a propylene guard bed system and a propylene transportation method. Background technique [0002] The role of the propylene guard bed system is to remove methanol, dimethyl ether and other oxides in the propylene products. The inlet and outlet of the propylene guard bed system are equipped with online analyzers to analyze the imported and exported methanol, ethylene, ethane, etc. 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 standby or regenerated. The regeneration cycle is 48 hours. Once oxides are found at the outlet of the guard bed, the feed is immediately cut into another guard bed after new / regeneration. When the guard bed is regenerated and put into use again, it must be cooled, as close as possible to the normal operating temperature. Slowly cool the g...

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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