Liquid Catalyst Spray for Diesel Particulate Removal
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Solution Overview
Problem
In diesel engines, particulate matter accumulates on the upstream end face of the oxidation catalyst and the exhaust passageway due to low exhaust gas temperatures, making it difficult to burn and remove without disassembling the exhaust system, which can lead to scattered particles and decreased fuel economy.
Innovation Solution
An internal combustion engine with a spray device that sprays a liquid oxidation catalyst upstream of the oxidation catalyst to oxidize and remove accumulated particulate matter using a catalytic action, eliminating the need for disassembly and reducing heat-induced deterioration of catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unburned fuel is supplied to forcibly burn and remove particulate matters on the trapping device, then particulate matters are removed, but unburned fuel adheres to the exhaust passageway upstream of the oxidation catalyst and forms new particulate matters
Solution Approach 1:
A liquid oxidation catalyst is introduced as an intermediary substance sprayed into the exhaust passageway upstream of the oxidation catalyst. This liquid catalyst promotes the oxidation of adhered fuel and existing particulate matters, preventing fuel adhesion while enabling effective particulate removal without requiring high-temperature forced combustion
Solution Approach 2:
The invention changes the chemical state by introducing a liquid oxidation catalyst that alters the oxidation parameters in the exhaust passageway. This allows particulate matter removal to occur at lower temperatures through catalytic action rather than thermal combustion, preventing fuel adhesion while maintaining removal efficiency
2Reliability
If the exhaust passageway is disassembled to mechanically remove accumulated particulate matters, then particulate matters are removed, but the exhaust passageway must be opened and particulate matters may be scattered
Solution Approach 1:
The system enables self-service particulate matter removal by spraying liquid oxidation catalyst into the exhaust passageway, allowing the exhaust system to clean itself chemically without requiring mechanical disassembly or external intervention. The catalyst promotes oxidation of particulate matters in situ, maintaining system integrity and preventing particle scattering
Solution Approach 2:
The invention replaces the mechanical removal method (disassembly and physical cleaning) with a chemical method (catalytic oxidation). By spraying liquid oxidation catalyst, particulate matters are oxidized and removed chemically without requiring mechanical access to the exhaust passageway, eliminating disassembly and scattering risks
3Reliability
If high temperature is applied to burn particulate matters, then particulate matters are removed, but the oxidation catalyst and trapping device suffer heat-induced deterioration
Solution Approach 1:
The invention changes the temperature parameter by using liquid oxidation catalyst to enable particulate matter oxidation at lower temperatures. The catalytic action allows the oxidation reaction to proceed efficiently without requiring high-temperature conditions, thereby protecting the catalysts from thermal deterioration while maintaining removal effectiveness
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 effectively prevents particulate matter scattering and fuel economy deterioration by oxidizing and removing accumulated particles at normal exhaust gas temperatures, without disassembling the exhaust system, while protecting the oxidation catalyst and trapping device from heat damage.
Implementation Method 1
oxidize and remove the accumulated particulate matter by a catalytic action of the supplied liquid oxidation catalyst
Implementation Method 2
oxidize and remove the accumulated particulate matter
Data Source
AI summary
A spray device 40 sprays a liquid oxidation catalyst 41 into an interior of an upstream small-diameter pipe 32 which is disposed upstream of an oxidation catalyst 25, so that the liquid oxidation catalyst 41 is supplied to particulate matters which have accumulated on an upstream end face 31 of the oxidation catalyst 25 and a diametrically expanded pipe 33 which is disposed upstream of the upstream end face 31 to thereby oxidize and remove the accumulated particulate matters by a catalytic action of the supplied liquid oxidation catalyst 41, whereby it becomes possible to remove the particulate matters which have accumulated on the upper end face 31 of the oxidation catalyst 25 which is disposed in an exhaust passageway and a portion of the exhaust passageway which is situated upstream of the upstream end face 31.