Emulsion Fuel System for Diesel Engine Switching
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Solution Overview
Problem
Diesel engines face issues with fuel consistency, power loss, viscosity, low speed instability, and incompatibility when running on water-diesel-emulsion (WDE) fuel, requiring a system to seamlessly switch between diesel and WDE without engine modification and addressing return fuel complications.
Innovation Solution
A system comprising a Premix Water Tank, WDE Blending Module, Dual-fuel Return Fuel Enabling Module, Heat Exchange Module, and Dual Fuel Management Module, which mixes diesel and premix water to produce WDE on demand, preheats the fuel, and manages fuel switching based on engine coolant temperature, while purging the fuel system to maintain consistency and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If WDE fuel is used to reduce emissions and save fuel, then environmental performance is improved, but fuel consistency deteriorates due to gravitational separation of water and diesel
Solution Approach 1:
The system performs preliminary heating of WDE fuel through a heat exchange module before fuel injection. This preheating action prevents gravitational separation by maintaining the fuel above its cloud point temperature, ensuring consistent emulsion stability throughout the fuel supply system from tank to injectors.
Solution Approach 2:
The system changes the temperature parameter of the WDE fuel dynamically. By heating the fuel to maintain it above the cloud point, the physical and chemical properties of the emulsion are preserved, preventing phase separation and maintaining consistent fuel delivery to the engine.
2Object-affected harmful factors
If WDE fuel is used to reduce emissions, then environmental performance is improved, but engine power deteriorates due to water content
Solution Approach 1:
The system optimizes the temperature parameter of WDE fuel by heating it before injection. This parameter change improves atomization quality and combustion efficiency, thereby maintaining engine power output while using WDE fuel for emission reduction.
3Use of energy by moving object
If WDE fuel is used to save fuel, then fuel efficiency is improved, but fuel delivery rate deteriorates due to high viscosity
Solution Approach 1:
The system changes the temperature parameter of WDE fuel by heating it before injection. This reduces the fuel's viscosity to acceptable levels, ensuring adequate fuel delivery rate to the engine while maintaining the fuel efficiency benefits of WDE operation.
4Object-affected harmful factors
If WDE fuel is used to reduce emissions, then environmental performance is improved, but fuel system compatibility deteriorates due to emulsion instability
Solution Approach 1:
The system performs preliminary heating of WDE fuel through a heat exchange module before fuel injection. This preheating action prevents gravitational separation by maintaining the fuel above its cloud point temperature, ensuring consistent emulsion stability throughout the fuel supply system from tank to injectors.
5Adaptability or versatility
If dual-fuel system is implemented to enable switching between diesel and WDE, then fuel flexibility is improved, but system complexity deteriorates due to multiple fuel tanks and management requirements
Solution Approach 1:
The system implements a multi-functional fuel management approach where a single fuel tank can accommodate both diesel and WDE fuels. The fuel pump and injection system serve both fuel types, and the control system automatically manages fuel selection and switching. This universal design reduces the number of separate components needed while maintaining the ability to use either fuel type or switch between them.
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
Enables seamless switching between diesel and WDE, maintaining engine performance, stability, and reducing emissions, while eliminating power loss and incompatibility issues, allowing for mass application of WDE fuel.
Implementation Method 1
Heat Exchange Module is connected to the main fuel supply line and the 'dual-fuel return fuel enabling module'. Engine coolant supplies heat to the heat exchange module to pre-heat WDE fuel.
Implementation Method 2
WDE Blending Module is connected to a Premix Water Tank and a Diesel Fuel Tank. It mixes premix water and diesel—in the proportion of 2 parts diesel and 1 part premix water—to produce WDE.
Data Source
AI summary
Disclosed are a system and a method for promoting the formation of the emulsified fuel of a diesel engine. The system includes a viscous oil-water tank; an emulsified fuel mixing device for mixing viscous oil-water with diesel fuel to obtain emulsified fuel; a dual-fuel return fuel emulsification-promoting device connecting to a diesel tank, the emulsified fuel mixing device, and the return fuel pipe and the main fuel pipe of the engine respectively; a heat-exchanging device for heating the emulsified fuel from the dual-fuel return fuel emulsification-promoting device by the cooling water of the engine; a first purifying pipe and a second purifying pipe for purifying the main fuel pipe; and a dual-fuel management device for switching between the diesel fuel supply and the emulsified fuel supply according to the temperature of the cooling water, and after the ignition switch of the engine is closed, for controlling the diesel fuel to clean up the emulsified fuel in the engine, in the main fuel pipe and in the devices. By using the system, the water content of the emulsified fuel can be up to 33% and the diesel engine can keep essentially unchanged power, start easily and run steadily.