Offshore natural gas development has become an important development direction in the world energy field. The basic unit for offshore natural gas development is the floating liquefied natural gas production, storage and offloading unit (FLNG).
It is widely used in the development of offshore natural gas due to its advantages of good mobility and reusability. The liquid output rate of FLNG is directly determined by the working performance of the liquefaction heat exchanger, so the heat exchanger is the core equipment of FLNG. The sloshing of FLNG under the influence of sea wind and waves will cause the heat exchanger to have different dynamic thermal characteristics compared with land-based conditions, and at the same time, the thermal stress and compressive stress of the material will increase, which will damage the heat exchanger. In order to ensure the efficient and stable operation of FLNG under offshore conditions, the heat exchanger needs to be compact, efficient, safe and reliable under sloshing conditions.
With its compact, efficient and reliable characteristics, the printed board circuit heat exchanger can meet the needs of the main low temperature heat exchanger for offshore floating natural gas liquefaction, and has gradually become the first choice for the main low temperature heat exchanger for offshore floating natural gas liquefaction in recent years. .
The LNG-FSRU/FLNG gasification-microchannel heat exchanger developed by Hangzhou Microcontrol can be widely used in floating LNG production, storage and unloading units; natural gas liquefaction condensers, regenerators, and natural gas regasification in offshore oil drilling platforms Evaporators, gas-to-air heat exchangers, subcoolers, etc.; and other offshore platforms, floating storage and regasification units.
LNG is the abbreviation of Liquefied Natural Gas, which is formed by the liquefaction of natural gas at ultra-low temperature (-162°C), and the main component is methane.
Natural gas liquefaction is a cryogenic process. During the liquefaction process, the refrigerant is pressurized by the refrigerant Natural gas liquefaction is a cryogenic process. During the liquefaction process, the refrigerant is pressurized by the refrigerant compressor, enters the cold box for pre-cooling, and is throttled to further cool the refrigerant, and then exchanges heat with the natural gas to the design temperature and returns to the compressor inlet. , forming a closed cycle, so the natural gas liquefaction equipment is very complicated.
The natural gas exchanges heat with the throttling and cooling refrigerant in the heat exchanger to cool the natural gas. Currently, the most widely used heat exchanger is the coiled tube heat exchanger, and a small number of other types of heat exchangers are plate-fin heat exchangers. heater. As shown in the figure below, with the expansion of LNG liquefaction enterprises, the advantages of wound tube heat exchangers have become more and more obvious, and they have gradually become the standard of basic load LNG liquefaction enterprises.
Offshore natural gas development has become an important development direction in the world energy field. The basic unit for offshore natural gas development is the floating liquefied natural gas production, storage and offloading unit (FLNG).
It is widely used in the development of offshore natural gas due to its advantages of good mobility and reusability. The liquid output rate of FLNG is directly determined by the working performance of the liquefaction heat exchanger, so the heat exchanger is the core equipment of FLNG. The sloshing of FLNG under the influence of sea wind and waves will cause the heat exchanger to have different dynamic thermal characteristics compared with land-based conditions, and at the same time, the thermal stress and compressive stress on the material will increase, and the heat exchanger will be damaged. In order to ensure the efficient and stable operation of FLNG under offshore conditions, the heat exchanger needs to be compact, efficient, safe and reliable under sloshing conditions.
With its compact, efficient and reliable characteristics, the printed board circuit heat exchanger can meet the needs of the main low temperature heat exchanger for offshore floating natural gas liquefaction, and has gradually become the first choice for the main low temperature heat exchanger for offshore floating natural gas liquefaction in recent years. .
The printed plate heat exchanger is a subversive and innovative micro-channel heat exchanger. In the offshore natural gas processing system, it is mainly used for cooling before natural gas is exported. The space of the offshore platform is limited, and the ordinary heat exchanger is bulky and heavy, which cannot meet the space and weight constraints of the platform. Compared with ordinary heat exchangers, the use of printed plate heat exchangers reduces the volume and weight by 85%, which is expected to save over 10 million yuan in construction, installation and maintenance of offshore platforms. This compact high-efficiency heat exchanger product combines the advantages of shell and tube heat exchangers and plate heat exchangers.
Compared with the wound tube heat exchanger, the plate-fin heat exchanger and the printed plate heat exchanger, as shown in the figure below, the printed plate heat exchanger has obvious advantages, and the outstanding features are safe, reliable and high-efficiency.
At present, Hangzhou Hangzhou Micro-control Energy Conservation Technology Co., Ltd. has been deeply engaged in the field of heat exchangers for many years, and has successfully developed a commercialized microchannel heat exchanger for LNG liquefaction, that is, a printed board heat exchanger.
Hangzhou Micro-control Energy Conservation Technology LNG liquefaction microchannel heat exchanger features: high heat transfer area density, high compactness, high heat transfer efficiency; extremely high pressure resistance (maximum pressure resistance up to 60MPa) and high and low temperature resistance (-196 ℃ to 900 ℃ ); less leakage and high welding strength; under the same heat load, its volume and weight are only about 1/6 of the traditional shell and tube heat exchanger.
The LNG-FSRU/FLNG gasification-microchannel heat exchanger developed by Hangzhou Hangzhou Micro-control Energy Conservation Technology can be widely used in floating LNG production, storage and unloading units; natural gas liquefaction condensers, regenerators, and natural gas regasification in offshore oil drilling platforms Evaporators, gas-to-air heat exchangers, subcoolers, etc.; and other offshore platforms, floating storage and regasification units.
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