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Reliquefaction method for evaporation gas of liquor goods on ship

A technology of evaporating gas and reliquefaction, which is applied in chemical instruments and methods, steam condensation, separation methods, etc., can solve the problems of not using multiple gases and single reliquefaction technology, achieve good recovery effect, improve efficiency and reduce system The effect of energy consumption

Inactive Publication Date: 2009-04-15
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] Although the above-mentioned patented technologies have their own characteristics, they are only single reliquefaction technologies for BOG produced by LNG, and are not used for multiple gases, such as reliquefaction of natural gas, ethylene and propane, etc. Meet the transportation of multiple petrochemical products, and make the liquefied gas carrier equipped with BOG reliquefaction system more competitive

Method used

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  • Reliquefaction method for evaporation gas of liquor goods on ship
  • Reliquefaction method for evaporation gas of liquor goods on ship

Examples

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Embodiment 1

[0040] Example 1: BOG reliquefaction of LNG

[0041] This embodiment describes a 6400M 3 The capacity of the LNG carrier adopts the method of the present invention to carry out the method of BOG reliquefaction. The molar composition of LNG is: methane 90.69%, ethane 5.21%, propane 2.94%, isobutane 0.56%, n-butane 0.45%, nitrogen 0.15%. According to its composition, the storage condition of the LNG is 0.101MPa, -160.6°C; at the same time, according to the design requirements of the liquid cargo tank, the maximum design pressure of the liquid cargo tank is 0.38MPa, and the daily BOG of the LNG tank of the carrier evaporates The BOG rate is about 0.2-0.38% of the total liquid cargo, and also includes the amount of BOG generated by pipelines, other equipment heating, LNG loading or unloading, etc.; the on-board reliquefaction system must have sufficient capacity to turn off the cargo within 24 hours. All liquid cargoes are lowered by 0.5°C, that is, the temperature of liquid car...

Embodiment 2

[0057] Example 2: Liquid Cargo Ethylene BOG Reliquefaction System

[0058] What this embodiment describes is still the liquid cargo carrier described in Example 1, and still adopts such as figure 1 The reliquefaction system shown, the difference is that this embodiment transports 6400M 3 LE, the storage condition is 0.114MPa, -102℃. At the same time, according to the design requirements of the liquid cargo tank, the maximum design pressure of the liquid cargo tank is 0.38MPa, and the daily BOG evaporation rate of the LE liquid cargo tank of the transport ship is about 0.2-0.38% of the total liquid cargo, and the pipeline should also be included , BOG generated by other equipment heating, LE loading or unloading, etc.; the onboard reliquefaction system must be capable of reducing all liquid cargo from -98°C to -102°C within 90 hours, that is, the liquid cargo within 90 hours The cargo temperature varies between -98°C and -102°C. Calculate according to the most stringent cond...

Embodiment 3

[0073] Example 3: Liquid Cargo Propane BOG Reliquefaction System

[0074] What this example describes is still the liquid cargo carrier described in Example 1. The same set of reliquefaction system is still used, but some equipment has been modified as follows: figure 2 The trade-offs shown. This embodiment transports 6400M 3 propane, the storage condition is 0.101MPa, -42.2°C, according to the design requirements of the liquid cargo tank, the maximum design pressure of the liquid cargo tank is 0.38MPa, the daily BOG evaporation rate of the propane tank of the carrier is about the total amount of liquid cargo 0.2% to 0.38% of the BOG generated by pipelines, other equipment heating, propane loading or unloading, etc.; the onboard reliquefaction system must have sufficient capacity to lower all liquid cargo by 0.5°C within 24 hours, That is, the liquid cargo changes between -42.2°C and -42.7°C. Calculate according to the most stringent conditions, that is, the gasification r...

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Abstract

The invention discloses a method for reliquefying vapor of shipped liquid cargos. The method comprises the following steps: performing heat exchange in a cold box between low pressure vapor from a liquid cargo tank and high pressure vapor which is compressed and has heat exchange with sea water in a second step; performing two-stage compression on the low pressure vapor of which the temperature is increased through the heat exchange with the high pressure vapors, and performing heat exchange through sea water after each stage of the compression; raising the pressure of the low pressure vapor so that the lower pressure vapor becomes the high pressure vapor and comes into the cold box to perform heat exchange with the low pressure vapor from the liquid cargo tank so as to cool down the vapor; and performing heat exchange in the cold box between the high pressure vapor pre-cooled by the low pressure vapor and a condensing agent, and condensing and liquefying the high pressure vapor. The method has the advantages of low energy consumption, simple equipment and high recovery rate. A reliquefying system designed according to the method can reliquefy different types of liquid cargo vapor to satisfy the transportation of more petrochemical products so that ships equipped with the system are more competitive.

Description

technical field [0001] The invention relates to the technical field of reliquefaction of boil-off gas (BOG) produced by liquid petrochemical products. The technical field specifically refers to a method for re-liquefying boil-off gas (BOG) of shipping liquid cargo. Background technique [0002] The optimization and adjustment of my country's energy structure requires the accelerated development of natural gas primary energy. In addition to relying on domestic resources, it is also necessary to import related resources from abroad. Therefore, the construction of LNG receiving stations is developing rapidly in my country. At present, the Shenzhen Dapeng receiving station has been completed. After more than two years of operation, the Putian receiving terminal in Fujian will be completed soon, and seven LNG receiving terminal stations in Shanghai, Jiangsu and other places will also be constructed before 2010, so the trade volume of LNG by ship will increase year by year. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D5/00B67D5/378B63J2/00B67D7/54
CPCF25J1/0025F25J1/0072F25J1/005F25J1/0204F25J1/0265F25J2220/62F25J2215/62F25J2230/30
Inventor 李亚军杨志国
Owner SOUTH CHINA UNIV OF TECH
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