Targetless FCC Feedstock Injection Device with Baffles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing injection devices for hydrocarbons in fluid catalytic cracking units face challenges such as erosion of internal targets and complex, costly mixing chambers, which increase production costs and reduce efficiency.
Innovation Solution
A hollow tubular injection device with a varying internal section and baffles that converge liquid flows to enhance mixing and atomization without an internal target, featuring a continuous internal section and strategically placed baffles to improve fluid dispersion and mixing without increasing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an internal target is used in impact injection devices to generate droplet formation, then atomization quality is improved, but erosion of the target occurs leading to reduced reliability and increased maintenance costs
Solution Approach 1:
The invention removes the internal target component from the injection device, replacing it with a targetless mixing chamber design. Liquid hydrocarbon is injected radially and atomized through interaction with axially flowing steam in the absence of any solid target, thereby eliminating erosion problems while maintaining effective atomization.
Solution Approach 2:
The invention uses steam as an intermediary substance to achieve atomization without a solid target. The axially flowing steam interacts with radially injected liquid hydrocarbon, using the steam's kinetic energy and turbulence to break up the liquid into droplets, replacing the function previously performed by impact on a solid target.
2Productivity
If additional atomizing gas is injected through a conduit surrounding the target to promote atomization, then mixing efficiency is improved, but the mixing chamber becomes complex and expensive to manufacture
Solution Approach 1:
The invention merges the functions of multiple gas injection systems into a single axial steam injection system. Instead of using separate conduits for additional atomizing gas around a target, the design combines all atomization function into the axial steam flow that interacts directly with the radially injected liquid, simplifying the mixing chamber structure.
Solution Approach 2:
The axial steam injection system performs multiple functions simultaneously: it provides the atomizing gas, creates the necessary turbulence for mixing, and serves as the primary fluid for heat and mass transfer. This multi-functional approach eliminates the need for separate additional gas injection conduits.
3Manufacturing precision
If multiple radial conduits are used to inject liquid jets into the body, then atomization is improved, but the mixing chamber remains complex and expensive to manufacture
Solution Approach 1:
The invention uses asymmetric injection patterns where liquid is injected radially from the wall while gas flows axially through the center. This asymmetric arrangement creates effective mixing and atomization without requiring multiple complex radial conduits, as the radial-axial interaction naturally generates the necessary turbulence and droplet formation.
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
The solution simplifies production, reduces erosion, and enhances the quality of atomization and mixing, improving the efficiency of hydrocarbon processing without significant pressure drop increases, thus lowering operational costs.
Implementation Method 1
The atomizing gas then exits at the target and impacts the liquid introduced through the opening opposite the target, promoting atomization of the liquid jet as it strikes it head-on.
Implementation Method 2
these liquid hydrocarbon feedstocks are atomized into fine droplets by injection devices. This atomization maximizes the liquid (liquid hydrocarbon feedstock)-solid (catalyst) contact surface area
Implementation Method 3
This atomization maximizes the liquid (liquid hydrocarbon feedstock)-solid (catalyst) contact surface area, which promotes heat transfer and thus the vaporization of these hydrocarbons
Data Source
Figure 1~2d
Figure 3~5
Figure 6~9
AI summary
The invention relates to an injection device (10) for atomizing a liquid into droplets using a gas, comprising a hollow tubular body (12) having a longitudinal direction (X). An inner wall (13) defines a first region, referred to as contact region (Z1), and a second region (Z2). The body includes: - at least two inlet ports (14; 16) for injecting liquid and an inlet port for injecting gas, all of said ports extending to the first region (Z1); - at least one outlet port (18), located downstream of the first and second regions, for discharging the atomized liquid. The body (12) has an inner cross-section that varies continuously or constantly over the entire length thereof. Between regions (Z1) and (Z2), the inner wall (13) includes at least one baffle (261) which is shaped such that in each plane running perpendicularly to the longitudinal direction of the body containing said baffle, the baffle reduces an inner cross-section of the body over the entire periphery of the inner wall (13).