A kind of low temperature propane unloading and heating technology

Abstract

The invention provides a low-temperature propane ship unloading and heating device and process. The device comprises a ship unloading arm, a pre-cooling unit, a pre-cooling buffering unit, a heating and boosting unit and a tank area spherical tank, wherein the ship unloading arm, the pre-cooling unit, the pre-cooling buffering unit, the heating and boosting unit and the tank area spherical tank are sequentially connected with one another, the pre-cooling buffering unit is connected with a condensate recovery unit, and the heating and boosting unit is connected with a heat exchange unit. The device has the beneficial effects that the whole set of ship unloading and heating device and process comprising a pre-cooling pipeline are designed, the pre-cooling time of a ship unloading pipeline iseffectively shortened through a segmented pre-cooling mode, and the stability and the safety of the pre-cooling process are high; and the heating and boosting unit of low-temperature propane is arranged, the received low-temperature propane can be heated to 10 DEG C-0 DEG C, and low-temperature steel can be replaced conveniently by a common carbon steel material for a spherical tank of a subsequent storage device, so that the investment of the spherical tank equipment is saved.

Description

technical field [0001] The patent of the present invention belongs to the technical field of low-temperature propane ship unloading technology, and in particular relates to a low-temperature propane ship unloading and heating process. Background technique [0002] In the existing technology, the liquefied propane purchased from overseas shipping needs to be unloaded and stored in the tank farm storage tank in the land area. The material of the tank farm storage tank equipment is generally made of carbon steel, which can withstand the lowest low temperature of -19°C; The internal propane temperature is about -41°C, so it is necessary to set up a low-temperature propane unloading and heating process device at the wharf, and after the low-temperature propane is unloaded safely, it will be warmed up to about 0°C and transported to the tank farm for storage. The low-temperature ethylene unloading processes disclosed in the prior art all focus on the cooling of the unloading pipel...

AI Technical Summary

Problems solved by technology

The low-temperature liquefied hydrocarbon thawing process has also been used in some domestic factories, but the 20,000m 3 The low-temperature liquefied hydrocarbon storage tanks receive the low-temperature liquefied hydrocarbons in the cabin. Although this large-volume storage tank can play a storage function in the low-temperature ship unloading system, there are great difficulties and dangers in the pre-cooling of equipment. During the process, it is required to drop the temperature by 1°C per hour, and the temperature difference between any two points in the storage tank should not exceed 10°C, the cooling time will be longer, the energy consumption of the pre-cooling process will be large, and the temperature control will be difficult. If the structure of the storage tank equipment is slightly imperfect, or A little carelessness in the pre-cooling temperature control operation will cause low-temperature liquefied hydrocarbons to quickly fall to the bottom of the storage tank, and the storage tank will be stressed due to the sudden low temperature, resulting in cold and brittle phenomena, resulting in large-scale leakage of liquefied hydrocarbons, endangering the tank area and Surrounding people are safe and urgently need improvement

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