52- The feather leaf separator is used in the structural design for separating light hydrocarbons in refining plants
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This post was last edited by luoli519 on 2023-10-2 at 16:16. In the cracking units of petroleum refining plants, the separation of various light hydrocarbon gas mixtures is a common task. In previous separation equipment, most systems still used gravity sedimentation tanks that have been in use since the 1970s. In recent years, many new project owners and enterprises eager for technological innovation have begun to use vane separators to replace the aforementioned gravity sedimentation tanks. Friends are requested to discuss based on their own experience and insights regarding the operation of lightweight oil-gas separators, as well as the existing problems.
Light oil and gas separation tanks that use pure gravity sedimentation for separation have low efficiency in this process, limited operational flexibility, and are not suitable for fluctuations in flow rates, temperature, and pressure. As a result, the efficiency of gas-liquid separation is poor, the dry gas is not properly dried, which leads to liquid accumulation in downstream pipelines and operational failures in downstream equipment. Production operations are not smooth, and the efficiency of equipment operation and maintenance is low.
Some owners and design firms have realized the problems caused by the low separation efficiency of gravity-settling type lightweight oil and gas separation tanks, such as disrupted operation of production lines and high costs for the operation and maintenance of the installations; as a result, they have installed mesh-type defoamers at the outlet of these separation tanks.
This post was last edited by luoli519 on 2016-11-20 at 20:39. However, the wire mesh demister is also a traditional primary separation element that has been in use since the mid-20th century. The droplets separated by the wire mesh demister fall into the upward airflow; essentially, this also represents a traditional and inefficient separation method based on gravity settling. Furthermore, since the screen-type demister utilizes pores formed by the interbridging of screen fibers to intercept, block, and separate the fluid ； The pores, which vary in size, make it difficult to achieve quantitative separation of liquid droplets and mist of a specific small size carried by the airflow; moreover, the operating pressure drop is high, and the gel-like substances carried by the oil and gas tend to accumulate and cause fouling on the screen internals. The original operational flaws were not improved; in fact, they even worsened.
This post was last edited by luoli519 on 2022-11-30 at 19:26. The image below shows a new type of lightweight oil and gas separator designed by a well-known domestic engineering company, using vane separation technology for its internal components, for use in an oil and gas production facility:
The operating conditions for this lightweight oil-gas separator are: 1. O.T.: 40℃； 2. O.P.: 2.55MPaG; 3. Gas flow rate: 1131890 Nm^3/h; 4. Liquid flow rate: 96226.9 kg/h ； 5. Gas phase composition (V%): H2, 61.7%; CO, 9.03; CO2, 12.81; CH4, 6.45; N2, 3.63; AR, 1.13; H2O, 0.28; others, 4.97% ； 6. Density: gas phase, 14.736 kg/m^3; liquid phase, 930.68 kg/m^3; 7. Viscosity: gas phase, 0.0123 cp ； Liquid phase, 0.49cp ； 8. Surface tension of the liquid phase: 61.3 dyne/cm.
The last edit to this post was made by luoli519 on 2022-11-30 at 19:27. The technical requirements for this lightweight oil and gas separator set by the owner and the design institute are as follows: 1. The internal components shall be of the G50 type vane separation components； 2. Separation efficiency: 3N-level separation to remove liquid droplets of 10 microns and larger in size ； 3. Overall operating pressure drop: not exceeding 20 kPa ； 4. Operational flexibility: 20-135%.
This post was last edited by luoli519 on 2022-11-30 at 19:27. The image below shows a photo of the G50 type vane separation component, designed by a specialized company in dynamics separation technology:
This post was last edited by luoli519 on 2019-1-31 23:12. For information on the development stages of dynamic separation internals technology, the differences in their internal structure, and the corresponding differences in technical performance, please refer to the following materials:
This post was last edited by luoli519 on 2022-11-30 at 19:28. Regarding dynamic separation technology and the design calculations for its components, it should be noted that some manufacturers both domestically and internationally have begun to adopt the vaned separation components produced by NOVEL Company. However, the feather-leaf separation technology is the design result and configuration form obtained based on the design technology of its precise dynamic separation system platform. It is necessary to rely on the design results and configuration formats obtained from the technology for designing precise kinetic separation system platforms, taking into account fluid dynamics parameters such as the gas phase composition and average molecular weight under different temperature and pressure conditions, the comparative compressibility factor of gases based on air as a reference system, gas phase viscosity, gas phase density, and gas phase flow rate, as well as liquid phase density, liquid phase viscosity, liquid phase surface tension, and the maximum liquid phase flow rate.
With the same operating conditions and process data, the results obtained through calculations and design by non-specialized companies differ significantly from those obtained by specialized dynamic separation technology companies using their precise dynamic separation calculation and design platforms. One of the most significant differences in the design calculations lies in the difference in the gas-phase compressibility factor under their respective operating conditions. It should be noted that precise and reliable dynamic separation technologies and their components must be verified through preliminary model platform experiments. For preliminary model platform testing, the safest and most readily available gaseous medium is air. Therefore, all prior models of dynamic separation in international research are systems using air as the medium. To approximate real operating conditions as closely as possible using a platform model for dynamic separation systems, it is necessary to use the gas phase under real conditions as a reference system similar to air at atmospheric pressure, in order to obtain the compression factor relative to air at atmospheric pressure. This compression factor is very different from the value of the compression factor based on an ideal gas, as given in the manual! !