External Loop Slurry Reactor Hydrocyclone Separation
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Solution Overview
Problem
Current external loop slurry reactors face challenges in complete separation of fine catalyst particles and liquid reactants, leading to unsatisfactory production efficiency, safety issues, and high energy consumption, with existing filtration technologies prone to blockages and inefficient solid-liquid separation.
Innovation Solution
The external loop slurry reactor design incorporates a gas-liquid integrated distributor, a riser, a degassing zone, a solid-liquid separation circulation unit, and a storage tank, featuring a downcomer connected to multiple hydrocyclones in series, which enables effective separation of catalyst particles down to micron-level sizes, reducing blockages and energy consumption by utilizing the reactor's directional flow for initial power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filtration technology is used for solid-liquid separation, then separation can be achieved, but the filter is easy to be blocked leading to unsatisfactory continuity production
Solution Approach 1:
The patent replaces the mechanical filtration system with a hydrocyclone separation system that uses centrifugal force generated by fluid dynamics. The hydrocyclone creates a rotating flow field where solid particles are separated from liquid based on density differences, eliminating the need for filter media that can become blocked and require maintenance.
Solution Approach 2:
The patent employs hydraulic principles through the hydrocyclone separator, utilizing the kinetic energy and pressure differential of the flowing slurry to generate centrifugal separation. The fluid dynamics within the hydrocyclone create a vortex that automatically separates solids from liquids without mechanical moving parts or filter elements.
2Ease of operation
If conventional slurry pumps are used for transporting slurry, then catalyst particles can be transported, but the pumps are expensive and fragile
Solution Approach 1:
The patent replaces mechanical slurry pumps with a pumpless circulation system that utilizes the hydrodynamic forces generated within the reactor itself. The downward flow of slurry through the hydrocyclone and the pressure differential created by the reaction process provide the driving force for circulation, eliminating the need for expensive and fragile pumping equipment.
Solution Approach 2:
The reactor system performs its own slurry circulation function through the natural hydrodynamic flow patterns created during operation. The system uses its own operational parameters (pressure differential, flow velocity) to drive the solid-liquid separation and circulation process without requiring external pumping equipment.
3Manufacturing precision
If catalyst particles are circulated outside the reactor, then separation can be achieved, but catalyst particles are easy to be broken
Solution Approach 1:
The patent combines the solid-liquid separation function with the reactor circulation system by integrating the hydrocyclone separator directly into the reactor loop. This integration allows catalyst particles to be separated and returned to the reactor in a continuous, gentle manner that minimizes mechanical stress and particle breakage while maintaining complete separation efficiency.
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
This design achieves continuous and efficient separation of solid particles, enhancing production efficiency and safety performance while reducing production costs by utilizing the reactor's flow for power and minimizing blockages, ensuring high separation efficiency and stable production.
Implementation Method 1
A hydrocyclone is installed at the bottom of the downcomer of the external loop reactor. The liquid and solid phase could be separated under the swirl flow effect in the hydrocyclone
Implementation Method 2
the directional flow of the reactor itself provides the initial power for the solid-liquid separation circulation unit, reducing the production cost
Data Source
AI summary
The present invention discloses an external loop slurry reactor, comprising a gas-liquid integrated distributor, a riser, a degassing zone, a solid-liquid separation circulation unit, and a storage tank. When the reactor works, reactants are injected into the riser through the gas-liquid integrated distributor; the slurry mixes and flows upwards to the degassing zone at the top for gas removal, and a large number of bubbles are removed. The slurry with catalyst particles then enters a downcomer and flows downwards. The slurry flows into a first-stage hydrocyclone and a multi-stage hydrocyclone in sequence for solid-liquid separation. The diameter of the first-stage hydrocyclone is larger than that of the multi-stage hydrocyclone. The separated solid particles flow back into the riser to continue to participate in the reaction.