112- Design of a dedicated dry gas superfiltration separator for the feed gas in LNG projects
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This post was last edited by luoli519 on 2020-1-4 at 12:52. In LNG projects or in the processes of natural gas processing and transportation, dry gas filters are used to treat the feed gas; these are also known as NG Super Filter Separators. Its important use is to remove the fine particulate matter, dust, as well as secondary liquid droplets and mist carried in the feed gas. Here, we will discuss in detail, through examples, the design of dry gas filters and separators for raw gas intake in LNG projects or natural gas processing and transmission processes, in the hope of helping everyone understand and design such specialized super-filtering and separation units for natural gas.
This unit is the feed gas inlet filtration and separation system involved in an LNG project in the Northeast, which we contracted for a special equipment manufacturer in East China a few years ago. At the owner’s request, this specialized manufacturing enterprise must carry out the design and manufacturing using professional separation technology and engineering, as well as a precise system platform developed through dynamic separation design. Our side will be directly responsible for this task. Previously, we have also provided various separation technology equipment specific for LNG plants for SALOF process packages in domestic and international LNG projects.
Based on raw natural gas, the production scale of this project is 100,000 Nm^3/d, requiring 2 sets of dry gas ultrafiltration separators in Series A and B. Next, an analysis is conducted for each set of basic operating conditions separately.
In terms of technical requirements, the inlet filtration separators for Series A and B of feed gases differ only in terms of the MDMT (minimum material design temperature); both require a separation efficiency capable of removing particles with a size of 3 microns or larger, with the overall operating pressure drop not exceeding 10 kPa.
This post was last edited by luoli519 on 2024-4-3 at 11:12. The inlet filtration and separation unit for the feed gas in LNG projects generally adopts a horizontal twin-tube design, as shown in the figure below:
This post was last edited by luoli519 on 2023-9-27 at 12:44. Through the precise design using a professional dynamics-based separation design and configuration system platform, the dimension data for the A and B series of dry gas super-filter separation units obtained are ID 273mm* SM/SM 2032mm. This filtration separator features a two-stage working chamber layout. The first-stage compartment is the filter element compartment, with G51F-type filter elements used to separate and remove particles of 3 microns or larger in size. The secondary chamber is a dedicated vane separation chamber, and the vane separation internal component set is of the G50 type; it is used to separate and remove the secondary entrained particles that have been pre-aggregated as fluid passes through the filtering media in the primary chamber and that are still suspended in the airflow. Regarding the selection of shell material, due to the different MDMT requirements for filters and separators in Series A and B, 20# carbon steel is chosen for Series A, while 16MnDR material is selected for Series B.
This post was last edited by luoli519 on 2024-4-3 at 11:13. The first-stage filtration element compartment of this filter separator uses G51F type elements, as shown in the figure below:
This post was last edited by luoli519 on 2024-4-3 at 11:13. This filtration separator features a two-stage dedicated vane separation chamber; the vane separation components are based on G50 patented technology and consist of a disc-type vane separation structure, as shown in the figure below:
By the way, as a supplementary note, the total operating pressure drop for the above two sets of dry super-filter separators under rated operating conditions is 0.974 psi (~6.72 kPa), which represents the sum of the pressure drops at the inlet, the first stage chamber, the second stage chamber, and the outlet.
This post was last edited by luoli519 on 2024-4-3 at 11:13. The image below shows the super filtration separators required for foreign natural gas processing projects that we have undertaken for other clients; please refer to it
As can be seen from the figure above, this filtration separator has a higher separation precision, meeting the requirement for removing particles with a size of 1 micron or larger. For more technical information on such super filtration separators, you can search for additional technical articles or visit our official website to learn more.