Boil-off gas (BOG) liquefying process and device

A process and compressor technology, applied in the field of BOG liquefaction process and device, can solve the problems of combustible gas combustion, environmental pollution, greenhouse effect, etc., and achieve the effects of reasonable heat exchange, simple operation and low maintenance cost

Active Publication Date: 2015-09-16
SHANXI QINSHUI XINAO GAS
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Problems solved by technology

The release of BOG not only wastes energy, but also brings the risk of combustible gas combustion and explosion. At the same time, it causes serious greenhouse effect and pollutes the environment, which runs counter to my country's planning goals of environmental protection, energy conservation and emission reduction, and sustainable development.
[0004] At present, the liquefaction of BOG is mostly applied in that BOG enters the cold box after being pressurized by the compressor, and is liquefied under the cooling action of the refrigeran...

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  • Boil-off gas (BOG) liquefying process and device

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Embodiment Construction

[0025] The invention proposes a BOG liquefaction process, which has a simple liquefaction process, a single refrigerant, and little impact on the original system, and is especially suitable for LNG storage and distribution stations and LNG filling stations.

[0026] Refer to attached figure 1 , the process of the present invention is realized through the following technical solutions: the low-temperature BOG from the LNG storage tank or the LNG loading and unloading system first enters the BOG low-temperature heat exchanger E-4 to recover cold energy, and the cold energy is increased by the BOG compressor C-1 After pressing, the high-pressure BOG is heat-exchanged and reheated to -20~-50°C (for example, -40°C), and optionally enters the BOG normal temperature heat exchanger E-2 for reheating to 15~25°C (for example, 20°C); The heated BOG is pressurized to 10-25MPaA (such as 20MPaA) by BOG compressor C-1, and then cooled to about 40-45°C in compressor aftercooler E-1, and then ...

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Abstract

The invention relates to a boil-off gas (BOG) liquefying process and device. The BOG liquefying process comprises reheated low-temperature BOG is compressed to high pressure through a compressor, precooled and throttled, and most of the BOG is liquefied according to the high-pressure throttling and refrigerating principle. The BOG liquefying process is simple, single refrigerating fluid is adopted, no influence is imposed on an original system, a unified skid-mounting device can be manufactured easily, and the BOG liquefying process and device are particularly suitable for LNG storage and distribution stations and LNG charging stations.

Description

technical field [0001] The invention provides a BOG (Boil Off Gas, boil-off gas) liquefaction process and device, which are suitable for reliquefaction of BOG produced by LNG storage tanks and LNG loading and unloading systems. Background technique [0002] At present, my country's LNG industry is still in the development period, and BOG release is a relatively common phenomenon. For some LNG facilities with insufficient supporting vehicles and users, the annual release volume can often account for more than 10% of the total purchased gas volume. Serious It can even reach 30%. Reliquefaction of BOG can effectively alleviate the problem of frequent release of BOG in LNG filling stations and other LNG facilities. With a design gas filling capacity of 10000Nm 3 / d LNG filling station as an example, if the release rate is 10%, the annual direct economic loss is close to 200,000 yuan. It is extremely economical to reliquefy BOG to avoid this part of the cost loss as much as pos...

Claims

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Application Information

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IPC IPC(8): F25J1/02
Inventor 何振勇蔚龙张生寇伟伟傅建青韩金潮郑忠英张晓哲徐化周
Owner SHANXI QINSHUI XINAO GAS
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