Exhaust Condensate pH Neutralization via Mixed Source Control
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Solution Overview
Problem
Engine exhaust condensate collected for water injection in internal combustion engines is often acidic and corrosive, posing a risk to water injection systems.
Innovation Solution
A system that utilizes a combination of acidic and basic water sources, controlled by a pH sensor and valve system, to neutralize the pH of the condensate stored in a reservoir, ensuring it is neither too acidic nor too basic for safe use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water condensation is collected from engine exhaust for water injection, then power and fuel efficiency are improved, but the water becomes acidic and corrosive to the injection system
Solution Approach 1:
The system captures exhaust condensate that would otherwise be wasted and converts it into a useful resource. By collecting condensate from both upstream (acidic) and downstream (basic) exhaust sources and mixing them, the harmful acidity is transformed into a beneficial neutral pH water suitable for injection, eliminating corrosion risks while maintaining performance benefits
Solution Approach 2:
The control system acts as an intermediary between the acidic upstream condensate and basic downstream condensate, automatically mixing them in appropriate proportions to achieve neutral pH. This intermediary mixing process prevents direct contact of acidic condensate with the injection system while still utilizing the condensate resource
2Object-generated harmful factors
If water injection is used to reduce NOx or CO emissions, then emission levels are reduced, but acidic condensate corrodes the water injection systems
Solution Approach 1:
The system converts the harmful acidic condensate into beneficial neutral pH water by mixing with basic condensate from downstream exhaust. This transformation enables continued use of water injection for emission reduction while eliminating the corrosion problem that would otherwise limit this emission control strategy
3Reliability
If pH neutralization is implemented to protect the water injection system, then system integrity is maintained, but additional complexity is introduced
Solution Approach 1:
The system uses the exhaust system's own downstream condensate (which is naturally basic) as the neutralizing agent for upstream acidic condensate. This self-service approach eliminates the need for external chemicals or complex treatment systems, achieving pH neutralization through internal resource utilization
Solution Approach 2:
The system merges two condensate streams (acidic upstream and basic downstream) into a single neutralized water supply. By combining these two sources through controlled mixing, the system achieves pH neutralization while utilizing existing infrastructure, minimizing additional complexity
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 effectively neutralizes the pH of the engine exhaust condensate, preventing corrosion and ensuring the water injection system's integrity, thereby improving engine performance and reducing emissions.
Implementation Method 1
a pH sensor that is configured to transmit a signal indicative of a pH of the water stored in the storage reservoir
Implementation Method 2
the water separated from the portion of the engine exhaust that is received by the upstream inlet is acidic and the water separated from the portion of the engine exhaust that is received by the downstream inlet is basic such that the water stored within the storage reservoir is neutralized
Data Source
AI summary
A water neutralization system that includes a first source of water that is acidic and a second source of water that is basic. A storage reservoir communicates with each of the first source and the second source, and includes a pH sensor that is configured to transmit a signal indicative of a pH of the water stored in the storage reservoir. At least one valve controls fluid communication between the storage reservoir and at least one of the first source and the second source, and a controller communicates with each of the pH sensor and the valve. Based on the signal indicative of the pH of the water stored in the storage reservoir, the controller instructs the valve to adjust an amount of water received from at least one of the first source and the second source to neutralize a pH of the water stored in the storage reservoir.