Plate Exchanger Reactor Staged Injection Thermal Management
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Solution Overview
Problem
Existing exchanger reactors face challenges in thermal management, particularly in highly exothermic reactions, leading to hot spots, reduced catalyst lifespan, and inefficiencies due to complex and costly solutions, as well as difficulties in staged reactant injection in plate exchanger reactors.
Innovation Solution
A plate exchanger reactor design with a staged injection system that allows for the distribution of reactive fluids at multiple points along the reactive channels, reducing the complexity and size of the reactor while improving compactness and temperature control by alternating reactive and cooling channels, and using diffusion welding or Hot Isostatic Compaction for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional fixed-bed or multitubular reactors are used for thermal management, then heat transfer capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The reactor is segmented into alternating reactive channels and cooling channels, allowing independent optimization of reaction zones and heat transfer zones. This segmentation enables efficient thermal management through distributed heat exchange surfaces while maintaining a relatively simple overall plate-based structure, avoiding the complexity of traditional multitubular configurations.
Solution Approach 2:
The plate structure serves multiple functions simultaneously: it acts as a structural support, a heat transfer surface, and a channel divider. The plates with integrated channels eliminate the need for separate heat exchange components, reducing device complexity while maintaining effective thermal management capability.
2Temperature
If tube diameter is reduced to improve heat transfer efficiency, then thermal management improves, but hydraulic bypass phenomena increase and contact time decreases
Solution Approach 1:
The channel dimensions are optimized locally for their specific function: reactive channels are sized to ensure adequate reactant-catalyst contact time and prevent hydraulic bypass, while cooling channels are sized to maximize heat transfer efficiency. This local optimization allows each channel type to perform its function effectively without compromising the other.
3Temperature
If staged injection system is implemented in plate exchanger reactor, then temperature control improves, but device complexity increases
Solution Approach 1:
Multiple injection points are pre-positioned along the reactive channels at locations where reactants need to be introduced for optimal temperature control. This preliminary arrangement of injection points in the plate structure allows staged injection to achieve precise temperature control without requiring complex external control systems, as the injection geometry is built into the reactor structure itself.
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 enhances thermal management, prevents hot spots, extends catalyst lifespan, and improves conversion efficiency by allowing for precise control of reactant distribution without increasing reactor size or complexity, while maintaining mechanical integrity under pressure and temperature conditions.
Implementation Method 1
Heat transfer and removal are generally achieved by a heat transfer fluid that circulates in a coil located on the external wall of the reactor or is introduced directly into the reactor
Implementation Method 2
poor heat dissipation, primarily due to the low thermal conductivity of the gas and catalyst assembly, leads to the formation of hot spots within the reactor
Implementation Method 3
using diffusion welding or Hot Isostatic Compaction for manufacturing
Implementation Method 4
using diffusion welding or Hot Isostatic Compaction for manufacturing
Data Source
Figure 1~2
Figure 3
Figure 4~8
AI summary
The main object of the invention is a plate heat exchanger reactor comprising: at least one reactive channel array comprising a plurality of reactive channels (3) extending in a first direction (D1), with a first reactive fluid (A); at least one cooling channel array comprising a plurality of cooling channels (4) extending in a second direction (D2), the first (D1) and second (D2) directions being substantially perpendicular. Said reactive and cooling channel arrays are superimposed alternately. The reactor comprises at least one injection channel (30) of a second reactive fluid (C) via an injection orifice (31) and at least one distribution channel (40) of the second reactive fluid (C) into at least one reactive channel (3) via a distribution orifice (41), the distribution channel(s) (40) each being located in a cooling channel array.