Thermal Diffusion Exhaust Gas Separation Using Plate Temperature Gradients
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Solution Overview
Problem
Existing methods for reducing carbon dioxide and other pollutant emissions from combustion exhaust gases are inefficient and energy-intensive, particularly in the transportation sector, and current technologies struggle to effectively separate multiple gas components using thermal diffusion.
Innovation Solution
A thermal diffusion unit with interconnected thermal diffusion cells and a temperature gradient is used to separate combustion exhaust gases into different components by utilizing the heat from the combustion engine, with a system that includes heating and cooling fluids to create a temperature gradient across plates, allowing for the separation of gases such as carbon dioxide and nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal diffusion is used to separate exhaust gas components, then separation efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent combines the thermal diffusion separation process with a heat exchanger that recovers heat from the separated gas streams. The heat exchanger transfers thermal energy from the warmer gas stream to the cooler gas stream, reducing the external energy input required to maintain the temperature gradient necessary for thermal diffusion, thereby reducing overall energy consumption while maintaining separation efficiency
Solution Approach 2:
The patent optimizes the temperature gradient parameters across the thermal diffusion medium by using variable heat exchanger configurations and adjustable heating/cooling rates. By dynamically adjusting temperature parameters rather than maintaining constant high temperatures, the system achieves effective separation while minimizing energy consumption
2Object-generated harmful factors
If multiple gas components are separated simultaneously, then emission reduction effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent divides the separation process into distinct stages using multiple thermal diffusion cells with different selective permeability characteristics. Each cell or stage is optimized for separating specific gas components (CO2, H2O, NOx, SOx) from the exhaust stream, allowing simultaneous multi-component separation while keeping each individual separation stage relatively simple and manageable
Solution Approach 2:
The thermal diffusion medium is designed with multi-functional properties that enable it to separate multiple gas components simultaneously through a single integrated device. The medium's structure allows different gases to be separated based on their unique diffusion coefficients, making the device capable of handling CO2, water vapor, nitrogen oxides, and sulfur oxides in one pass without requiring separate specialized units for each component
3Productivity
If thermal diffusion unit size is increased to improve separation capacity, then productivity is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent employs a nested or stacked configuration of thermal diffusion cells where multiple separation stages are arranged in a compact, space-efficient manner. The cells are positioned to share common structures and flow paths, allowing the system to achieve high separation capacity through increased surface area and multiple stages without proportionally increasing overall device complexity or space requirements
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 system efficiently separates combustion exhaust gases into different components, reducing emissions by concentrating heavier gases in cooled passages and lighter gases in heated passages, thereby enhancing energy efficiency and reducing the risk of contamination in the thermal diffusion unit.
Implementation Method 1
separate the components of the combusted exhaust gas
Implementation Method 2
a temperature gradient is used to separate combustion exhaust gases
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A thermal diffusion unit (120, 200) is fluidly connected to a combustion engine (100) via a flue line (130, 132). The thermal diffusion unit (120, 200) has a plurality of plates (212, 214) assembled in a parallel configuration, including a pair of heating plates (212) having a heating fluid gap (226) extending therebetween and a pair of cooling plates (214) having a cooling fluid gap (236) extending therebetween. A diffusion sheet (240) is positioned between the pair of heating plates (212) and the pair of cooling plates (214), such that the diffusion sheet (240) interfaces on a first side with one of the heating plates (212) and interfaces on an opposite side with one of the cooling plates (214). The diffusion sheet (240) includes a plurality of interconnected thermal diffusion cells (310) arranged in a repeating pattern.