87- Multi-factor cyclone mother-son separator applied to the design of cold high-pressure separation unit and cyclone amine removal unit in the cyclohydrogen desulfurization section of a hydrodesulfurization unit

The outlet gas from the hydroprocessing unit, after being cooled through heat exchange, contains high-pressure recycled hydrogen along with a large amount of oil-water mixture. A high-pressure cyclone separator must be used to separate and capture the large amount of oil-water mixture along with its droplets and mist present in the high-pressure recycled hydrogen gas. This is a mandatory requirement from the process package supplier and the engineering company. The multi-factor swirl parent-child separator is a rare option for such high-pressure gas-liquid swirl separators.

This post was last edited by luoli519 on 2017-2-28 at 11:26. Since high-pressure cyclic hydrogen needs to enter the subsequent high-pressure amine absorption tower for \"three removals\", it is necessary to use a multi-factor cyclone separator before the cyclic hydrogen enters the amine absorption tower, in order to effectively remove the large amounts of oil, water, as well as liquid droplets and mist present in the hydrogen stream. This prevents these substances from entering the amine absorption tower, thereby avoiding a reduction in the efficiency of the \"three removals\" process and the costs associated with amine regeneration. Some process package suppliers, engineering companies, and owners also refer to this multi-factor cyclone mother-son separator as a “high-pressure cyclone hydrocarbon removal unit,” “cold high-pressure separator,” or “cold high-pressure separator,” all of which have the same function.

High-pressure cyclic hydrogen gas exits the amine absorption tower from its top; therefore, it is necessary to efficiently capture and recover the amine solution carried by this gas from high-pressure, high-flow hydrogen streams, and for this purpose a multi-factor cyclone mother-son separator must be used as a high-pressure cyclonic amine removal unit. This is also a requirement from process package suppliers and engineering companies both domestically and internationally.

The high-pressure cyclone deammonifier can be installed at the beginning of the gas-phase outlet pipe at the top of the amine absorption tower, or it can be installed at the end of the gas-phase outlet pipe of the absorption tower. Its main function is to efficiently capture and recover the amine solution from high-pressure gas streams. This not only helps to significantly reduce the consumption of amine solution and thus lower operating costs, but it also prevents droplets and mist carried by the gas flow from accumulating in downstream pipelines and causing \"fluid resistance\", which can lead to poor gas flow and unstable pressure. Additionally, it prevents the liquid carried by the gas flow from causing failures in the downstream critical equipment.

A high-pressure swirl desulfurizer, when installed inside an absorption tower, is referred to by some process package suppliers, engineering companies, and owners as a “swirl desulfurizer integrated within the circulating hydrogen desulfurization tower”. If installed on the gas flow outlet pipeline of the absorption tower, it is simply called a “high-pressure cyclone amine remover”. Generally, if it is installed independently on the gas flow outlet pipeline of the absorption tower, maintenance and inspection are very convenient, and by making slight adjustments to the liquid control parameters, it can be switched with the \"cold high-pressure separator\" located in front of the absorption tower to serve as a backup unit.

Some process package suppliers, engineering companies, and owners wish to design the internals of the aforementioned two multi-factor cyclone mother-separator units as detachable multi-element cyclone internal assemblies, which is entirely feasible; however, the configuration design of such assemblies becomes more complex and the costs increase accordingly. On the premise of meeting process requirements, technical equipment with the best cost-performance ratio is often the most viable and competitive.

Due to NOVEL’s patents on multi-factor cyclone separation technology, as well as its platform for precise dynamic separation calculation and design of high-pressure, high-efficiency gas-liquid cyclone separators, it is able to provide comprehensive and accurate hydraulic calculation documents for the dynamic separation process, which serve as a basis for design verification. Unlike the \"rough estimates\" offered by some domestic and foreign imitators, process package suppliers, engineering companies, clients, and agents around the world send their basic process data to NOVEL, requesting cooperation in developing precise dynamic separation solutions using multi-factor cyclone separators.

This post was last edited by luoli519 on 2017-2-28 at 12:00. Here, we take as an example the situation where a certain petrochemical engineering company commissioned our firm to carry out professional technical diagnosis and evaluation of two types of high-pressure cyclone separators – those supplied by a domestic cyclone separator manufacturer for the cycle hydrogen separation and purification unit of a diesel hydroprocessing unit designed by a Shandong-based petrochemical company – in order to discuss this topic.

The last edit to this post was made by luoli519 on 2017-2-28 at 12:01. The operating parameters of the high-pressure cyclone hydrocarbon removal unit located before the absorber, as provided by a certain engineering company, are as follows: 1. Operating temperature: 50℃； 2. Operating pressure: 10.5 MPaG; 3. Vapor flow rate of recycled hydrogen: 31265.1 kg/h ； 4. Circulating hydrogen density: 16.88 kg/m^3; 5. Oil phase flow rate: 24919.8 kg/h ； 6. Oil phase density: 712.3 kg/m^3; 7. Water phase flow rate: 15940.6 kg/h ； 8. Density of the aqueous phase: 992.6 kg/h.

The technical requirements from the process package supplier, engineering company, and owner are: 1. Residual amount of C5+ droplets and foam in the outlet stream of the separator