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Newest LNG Patents

LNG Heat Exchanger

Performance improvement in CWHE for natural gas liquefaction

Date of Patent: 1/24/2023

The patent covers optimization of CWHE performance by adjustment of tube side flow for improved liquefaction unit operation.

Liquefying natural gas using an open-loop reverse brayton natural gas refrigeration cycle

Liquefying natural gas using an open-loop reverse brayton natural gas refrigeration cycle where vapor liquid separator is located at the top of a coil wound heat exchanger. The liquid is removed and combined with the main LNG circuit while the vapor is used at the refrigerant for the bundle. Precooling of both the natural gas and recycled refrigerant occurs in a high-pressure expander, eliminating the need for large pre-cooling heat exchangers. Utilizing this method of liquefaction can provide various benefits such as improved efficiency, reduced capital cost, and reduced footprint.
Partial shot of LNG coil wound heat exchanger

An advancement in the end flash system equipment

Date of Patent: 4/20/2021

The combined end flash drum and a coil wound exchanger reduces the overall footprint and eliminates the need for large diameter back-end piping. This system is more efficient because of a reduced pressure drop of the lower pressure stream. The coil wound exchanger for end flash service is proven to be very robust and able to withstand the thermal stresses associated with this type of service.
Welder working on LNG heat exchanger at Port Manatee facility

Balancing power in a split mixed refrigerant (MR) liquefaction system

Date of Patent: 3/2/2021

The system is configured to adjust characteristics of the high-pressure compressor to require less power when less power is available and more power when more power is available compared to the system’s design point. Such adjustments allow for shifting the balance of power between the propane compressor and the high-pressure MR compressor to improve LNG production efficiency.

Natural gas liquefaction technology using a hybrid gas expander and mixed refrigerant cycle

Date of Patent: 12/15/2020

The patent covers a liquefaction cycle utilizing a closed loop cycle that employs gas expander refrigeration for precooling and liquefaction. The final subcooling is provided by a boiling nitrogen-methane mixed refrigerant. This technology is particularly useful for small to mid-scale liquefaction opportunities and where the procurement or production of hydrocarbon refrigerants is difficult.

New natural gas liquefaction technology

Date of Patent: 12/1/2020

The multiple pressure, mixed refrigerant cooling system can increase the capacity and efficiency of the dual mixed refrigerant natural gas liquefaction process. This technology utilizes Air Products’ proven coil wound heat exchanger and is particularly useful for land-based arctic LNG production and floating LNG applications.