Radial Liquid Injection Device for Hydrocarbon Feedstock Atomization
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Solution Overview
Problem
Existing hydrocarbon feedstock injection devices face challenges with heavy feedstocks, requiring high pressure and increased steam flow, leading to increased costs and potential negative impacts on reaction yield due to target erosion and complex, expensive production.
Innovation Solution
A novel injection device with radially arranged liquid inlet ducts that intersect at a single point, allowing liquid jets to impact and form droplets, which are then swept by an axial gas flow, reducing pressure drop and eliminating the need for powerful pumps and excessive steam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heavy feedstocks are atomized using conventional two-phase injection devices, then atomization is achieved, but pressure drop increases significantly requiring powerful and expensive pumps
Solution Approach 1:
The liquid inlet is divided into multiple radial ducts (at least two) that distribute liquid feedstock along the wall of the internal duct, creating multiple liquid streams that interact with the axial gas flow. This segmentation allows efficient atomization of heavy feedstocks without requiring excessive pump power, as each radial duct creates localized atomization zones that collectively achieve complete dispersion.
Solution Approach 2:
The invention uses a two-phase flow system where an axial gas flow (steam or inert gas) interacts with radially injected liquid streams. The gas flow entrains and atomizes the liquid feedstock through fluid dynamic interactions, eliminating the need for high-pressure liquid injection and powerful pumps while maintaining effective atomization for heavy feedstocks.
2Manufacturing precision
If conventional injection devices are used to treat heavy feedstocks, then atomization is achieved, but atomizing gas flow rate must be considerably increased
Solution Approach 1:
The invention introduces liquid feedstock injection in a radial direction perpendicular to the axial gas flow, creating a three-dimensional interaction pattern. This dimensional change allows the liquid to be injected along the wall and interact with the axial gas flow over an extended path, improving atomization efficiency without requiring increased gas flow rates.
Solution Approach 2:
The radial liquid inlet ducts are positioned to extend along a significant portion of the internal duct length, ensuring continuous liquid injection and atomization throughout the gas flow path. This continuous action maximizes the utilization of the atomizing gas flow, achieving complete atomization without needing to increase the overall gas flow rate.
3Manufacturing precision
If target impact injection devices are used, then droplet formation is achieved, but target erosion occurs and production cost increases
Solution Approach 1:
The invention completely eliminates the solid target component from the injection device by using purely fluid dynamic atomization. The radial liquid streams interact with the axial gas flow to achieve droplet formation without any solid impact surface, thereby removing the source of target erosion and the need for expensive target reinforcement or replacement.
Solution Approach 2:
The invention replaces the mechanical impact-based droplet formation system with a fluid dynamic atomization system. Instead of liquid impacting a solid target, the liquid is atomized through its interaction with the axial gas flow, substituting mechanical impact with aerodynamic forces and eliminating the associated erosion problems.
4Manufacturing precision
If large amounts of steam are injected for atomizing heavy feedstocks, then atomization is improved, but reaction yield decreases due to undesired parallel reactions
Solution Approach 1:
The invention changes the operational parameters by achieving effective atomization with lower steam flow rates through the radial liquid injection configuration. This parameter change allows maintaining atomization quality while reducing the amount of steam injected, thereby minimizing undesired parallel reactions and preserving reaction yield in FCC units.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient atomization of heavy feedstocks with reduced pressure drop and lower steam usage, maintaining reaction yield while lowering production costs and avoiding target erosion.
Implementation Method 1
liquid inlet ducts passing through said body radially or substantially radially and opening into said internal duct, these liquid inlet ducts each having an axis and being arranged so that their axes intersect at one and the same point on an axial line extending inside the internal duct
Implementation Method 2
an axial gas flow making it possible to entrain these droplets while dividing them further at the outlet of the body
Implementation Method 3
these liquid hydrocarbon feedstocks are atomized into fine droplets by injection devices. This atomization makes it possible to maximize the liquid (liquid hydrocarbon feedstock)-solid (catalyst) contact area
Data Source
AI summary
Embodiments of an injection device shaped in order to atomize a liquid into droplets by means of a gas are disclosed herein. The injection device may comprise a body having a gas inlet orifice intended to be connected to a gas supply duct. The injection device may further comprise an outlet orifice for discharging the atomized liquid. The injection device may also comprise a straight internal duct connecting the inlet orifice to the outlet orifice along an axial direction of said body. At least two liquid inlet ducts may be intended to be connected to at least one liquid supply duct pass through said body radially or substantially radially and open into said internal duct. These liquid inlet ducts may each have an axis and are arranged so that their axes intersect at one and the same point on an axial line extending inside the internal duct.