Exhaust Gas Particle Cleaning Device With Temperature Gradient
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Solution Overview
Problem
Current catalyst devices are ineffective in removing particles from exhaust gases, particularly those smaller than 0.1 µm in size, as they have negligible mass and cannot be removed by burning off filters when ash content is high, and larger particles require different removal methods.
Innovation Solution
An exhaust gas particle cleaning device with a higher and lower temperature section is used to achieve water supersaturation, allowing particle growth at the lower temperature section for efficient removal, utilizing a two-part system with a centrifugal mist separator for effective particle removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are used to remove particles from exhaust gas, then particle removal is achieved, but particles containing high fraction of ash cannot be removed by burning off the filter
Solution Approach 1:
The invention changes the temperature parameter of the exhaust gas by introducing a cooling section that reduces the gas temperature from typically 400-700°C to 200-400°C. This temperature reduction triggers water supersaturation and condensation, causing water to deposit on particles and increase their size and mass, making them removable even when containing ash that would prevent conventional filter burning
Solution Approach 2:
The invention utilizes the phase transition of water from vapor to liquid through cooling-induced supersaturation. Water vapor in the exhaust gas condenses into liquid water that deposits on particles, fundamentally changing the particle properties (mass, size, density) and enabling removal mechanisms that work even with ash-containing particles
2Reliability
If catalyst devices are used to clean exhaust gas, then gas cleaning is achieved, but particles smaller than 0.1 μm with negligible mass are not removed
Solution Approach 1:
The invention changes the temperature parameter to create water supersaturation, which causes water condensation on particles. This increases particle mass from negligible to sufficient levels, enabling removal by subsequent separation devices
Solution Approach 2:
The invention introduces water as an intermediary substance that mediates between the particles and the removal mechanism. Water condenses on particles, acting as a bridge that transfers mass to the particles and enables their capture by centrifugal or other separation forces
3Manufacturing precision
If residence time in the exhaust gas particle cleaning device is increased to achieve particle growth, then particle size increases for efficient removal, but the device size and complexity increase
Solution Approach 1:
The invention changes the temperature parameter gradient within the device to control particle growth rate. By creating a controlled cooling zone with specific temperature reduction, particle growth is accelerated, allowing sufficient residence time for growth without requiring excessively long device lengths or complex multi-stage structures
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 method enables the growth of particles to a larger size for efficient removal, enhancing the capability to handle small particles and achieving optimal emission levels by adjusting residence time and particle size for effective filtration.
Implementation Method 1
In the exhaust gas particle cleaning device water supersaturation is present, whereby particles are grown to a larger size for removal
Implementation Method 2
water supersaturation is present, whereby particles are grown to a larger size for removal
Implementation Method 3
The exhaust gas particle cleaning device is provided with a higher temperature section and with a lower temperature section causing particle growth at the lower temperature section
Data Source
AI summary
The invention relates to a method for removing particles from exhaust gas from an exhaust gas flow of an internal combustion engine (1 ). The exhaust gas from an internal combustion engine (1 ) is led to an exhaust gas particle cleaning device (9). In order to allow for efficient particle removal from the exhaust gas, water super saturation is provided in the exhaust gas particle cleaning device. The exhaust gas particle cleaning device is provided with a higher temperature section and a lower temperature section causing particle growth at the lower temperature section.