84- The feather leaf separator is used in the design of the inlet gas separator, outlet gas separator, and exhaust gas separator of the MDEA absorption tower in LNG projects

This post was last edited by luoli519 on 2017-2-12 at 11:26. For the feeding gas separator in the MDEA absorber of LNG projects, its main function is to remove the condensate contained in the feed gas entering the absorber, thereby preventing this condensate from accumulating inside the MDEA absorber. In particular, when liquid hydrocarbons accumulate in the MDEA absorber, they can form water-in-oil structures or significant oil layers, which hinder direct contact and mass transfer between the acidic gases in the feed gas and the liquid phase of MDEA. By removing the water condensate from the feed gas entering the tower, **preventing the feed gas from carrying water into the MDEA absorption tower reduces the workload on the solvent regeneration tower and saves energy consumption. For the Outlet Gas Scrubber of the MDEA absorber in LNG projects, its main function is to remove the large amount of MDEA solvent droplets present in the gas exiting the absorber. This prevents the MDEA solvent from escaping from the absorber and entering downstream pipelines and equipment. It helps to reduce solvent consumption, as well as prevent the accumulation of MDEA solution in these downstream pipelines and equipment, which could lead to flow restrictions and equipment failures. For the KO drum in the MDEA regeneration tower of LNG projects, its main function is to remove droplets and mist of MDEA and light hydrocarbons contained in the exhaust gas exiting the tower, thereby preventing these liquid phases from entering downstream pipelines and equipment. This helps avoid the accumulation of liquid phase in such pipelines and equipment, which could lead to flow restrictions and equipment malfunction ； On the other hand, it can reduce the costs associated with subsequent exhaust gas treatment.

This post was last edited by luoli519 on 2023-9-27 at 15:23. Regarding the feeding gas separator for the MDEA absorber in LNG projects, among the projects that have been built and are in operation in China, some use horizontal double-tube filtration and coalescing separators, some employ multi-factor swirl parent-child separators, some use vane separators, while others use fiber mesh separation tanks or gravity sedimentation tanks; even some earlier projects did not have any separation tank for the feeding gas before it entered the absorber. Regarding the outlet gas scrubber for the MDEA absorption tower in LNG projects, among the projects that have been built and are in operation in China, some use filter types, some employ multi-factor swirl separator systems, some use vane separators, while others utilize fiber mesh separation tanks or gravity sedimentation tanks. In fact, some of the earlier projects did not even have a separation tank for the feed gas before it entered the tower. Regarding the exhaust gas separator (KO Drum) for the MDEA solvent regeneration tower in LNG projects, among the projects that have been built and are in operation in China at present, some use multi-factor cyclone mother-son separator types, some use vane separators, while others employ fiber mesh separation tanks or gravity sedimentation separation tanks; even some earlier projects did not have a separation tank for the feed gas before it entered the tower.

This post was last edited by luoli519 on 2017-2-12 at 11:32. The horizontal twin-tube filtration, coagulation, and separation unit is a type of highly sophisticated separation device, and its operation and maintenance costs are very high. Due to its two-stage structure, with a coalescing filter element assembly in the first stage and a vane-type separation element assembly in the second stage, the filter elements used in the first stage need to be replaced regularly; therefore, a backup unit is required so that it can take over operation during maintenance and replacement of the filter elements, thereby ensuring that the production line remains operational. Furthermore, since the filtration coalescing separator is a high-precision separator, a pre-separator must be installed to remove the bulk of the load from the gas phase, leaving only the remaining load to be treated in detail. In fact, in LNG projects, raw gas purification is part of the initial processing steps; subsequent processes require multiple separation stages. Using a filter-coalescer separator in this context is rather \"luxurious\" and offers poor cost-effectiveness. It is recommended to choose other types of separators with good cost-performance, as appropriate.

The multi-factor swirl parent-child separator belongs to the category of high-efficiency dynamic separation technology equipment. Under the same medium and low pressure conditions, the higher manufacturing cost of the internal components for multi-factor swirl separator mother-son separators reduces their cost-performance advantage. The multi-factor swirl separator for mother-son separation boasts outstanding comprehensive cost-performance advantages in gas-solid separation, as well as superior performance in gas-liquid separation under high-pressure and ultra-high-pressure conditions – virtually unmatched by any other alternative.

This post was last edited by luoli519 on 2024-4-3 at 10:36. The feather leaf separator is also a device based on high-efficiency dynamic separation technology; it represents the fifth-generation of such separators, offering excellent cost-performance advantages. The first generation of Chevron vane technology, which was put into use in the mid-20th century, has gone through more than half a century of development, upgrades, and technological improvements, giving rise to the fifth generation of vane separation technology. Blades from different technological eras and levels have varying internal structures, and the performance resulting from these structures also differs. The higher the technical level of a blade, the better its overall performance and cost-effectiveness. The vane separation technology has achieved a fundamental improvement in terms of quantitative separation efficiency, operational stability, operational flexibility, anti-clogging performance, and operating pressure drop. Thus, it is widely used in a wide range of operating conditions such as vacuum, normal pressure, low pressure, and medium pressure. To help everyone distinguish the vane separation internal components based on their internal structure, a picture of the internal and geometric structure of the G50 vane separation is provided for reference.

This post was last edited by luoli519 on 2023-9-27 at 15:24. Regarding fiber mesh separation tanks, they belong to the category of traditional, simple separation technologies and structural separators. It primarily achieves the blocking, interception, and separation of substances carried by the airflow through the \"cells\" formed by the interbridging of fibers within the internal components. On the one hand, due to the slightly different sizes of the \"cells\" formed by the interbridging of fibers, their structure prevents them from being capable of achieving precise separation of small-sized droplets ； On the other hand, the larger droplets formed as a result of interception by the fiber mesh internals fall back into the airflow, and it is necessary to separate them from the airflow through gravity settling; thus, the separation efficiency is not high. Furthermore, if the airflow contains viscous liquid droplets, foam, and solid dust particles, it is easy for these to block the flow channels in the surface, middle, and deep layers of the fiber mesh interior components. In particular, blockages in the middle and deep layers are difficult to remove effectively, requiring regular replacement of these components; as a result, operational efficiency and maintenance costs are high. In recent years, owners, process package suppliers, and design institutes have increasingly adopted G50 vane separation technology and equipment. This technological upgrade replaces traditional fiber mesh separation tanks, not only improving the efficiency of separation processes but also reducing operational and maintenance costs, thereby gaining a technical and economic advantage.

As for gravity sedimentation separation tanks, they are more akin to traditional, simple, and inefficient separation equipment. Not only is the separation efficiency low, but the equipment is usually large in size, resulting in high costs for space and piping; the overall cost is even higher when it is installed on a platform. In recent years, owners, process package suppliers, and large and medium-sized design institutes have basically stopped using gravity-settling separation tank solutions. Only a few small design firms, constrained by their overall technical capabilities and level, still use gravity-settling separation tanks from time to time. Furthermore, for economic reasons related to the EDP mode, the separation tank is even removed. This requires the technical personnel on the owner’s side to take care of it themselves.

This post was last edited by luoli519 on 2023-9-27 at 15:25. Here, taking an LNG project designed by a certain LNG technology company in Zhejiang for a client in Shanxi, which utilizes coke oven gas as feedstock, as an example, we discuss the process and design aspects of vane separators in such separation processes.

Operating conditions of the Feeding Gas Separator: 1. Operating pressure: 56 BarA； 2. Operating temperature: 40℃ ； 3. Gas phase flow rate: 8549 kg/h; 4. Gas phase viscosity: 0.013 cp ； 5. Average molecular weight in the gas phase: 17.63 ； 6. Liquid phase volume flow rate: 427 kg/h; 7. Liquid phase density: 695 kg/m^3; 8. Liquid phase viscosity: 0.469 cp ； 9. Surface tension of the liquid phase: 45.5 dyne/cm.

This post was last edited by luoli519 on 2023-9-27 at 15:25. For this application scenario, we adopted a G50-type vane separator; the design results for the feeding gas separator, which were obtained using NOVEL’s proprietary and precise dynamic separation calculation and design system, are as follows: 1. Separator type: G50-type vane separator； 2. Separation efficiency: 4N level, capable of removing liquid droplets and foam with a size of 8.36 microns or larger. 3. Overall operating pressure drop: 2.85 kPa. 4. Equipment dimensions: ID600*TL/TL1700.