Effects of biofuel blending components on combustion properties and emissions from heavy duty engines

Lead Research Organisation: University of Leeds
Department Name: Chemical and Process Engineering

Abstract

Currently biofuel production methods focus on the production and isolation of individual components. However, mixtures of products tend to be formed and the isolation is an expense that could be eliminated if the blend of products could be directly utilised in fuel blends and current engine technologies. The concept of tailored fuel design considers fuel properties according to the molecular structures available to the evolving reaction mixture to give the best combustion behaviour for a certain application. This project aims to determine how a blend of biofuel components as an increasing percentage of gasoline and diesel will affect the performance of these fuels. My work should also generate data for the optimization of biofuel/conventional fuel formulations for drop-in deployment with clean and efficient utilisation, the minimisation of greenhouse gas (GHG) and pollutant emissions, and the associated production costs of these fuels.

The effects of the biofuel blend composition on the following parameters would be measured or determined:

Ignition delay - to determine if the blend changes the combustion characteristics of the fuel, which would be measured using the research engines in the engine testing facilities.
Emissions of NOx, PM, CO2 and other GHGs would be measured using the engine testing facilities and the exhaust gases analysis equipment.
The engine performance and efficiency will be measured using the research engines as the change in the fuel chemistry will affect how the engine performs.
Derived cetane and octane numbers as these give an indication of the fuel's performance.

The project would use a combination of experimental engine testing and computational kinetic modelling of the fuel's behaviour. The modelling would be used to both predict and validate the engine studies, with the hope that it could determine what blends would be best to run engine tests on. The aim would be to combine these to be able to produce a matrix of how varying the amount of a specific fuel component would affect the four key characteristics mentioned above. The matrix would then enable the optimum fuel blend to be produced for its given application.

Planned Impact

Impacts and benefits to the Non-Academic Users of the Centre include:
- Access to high quality, interdisciplinary R&D support to increase competitiveness
- Cutting edge research with high value for money;
- Access to knowledge and expertise;
- Recruitment from a pool of talented early-career students for future employment, and input into shaping the skill development of those students (engineers and scientists with training in the wider context of sustainability, economics, policy and commercial awareness).
- Technology transfer research;
- Access to a breadth or research facilities and expertise and interdisciplinary teams;
- Consultancy,
- Networking and participating in focussed forums with other technolgogy users and policy makers - sharing experiences;
- Training or secondments of their staff for enhanced knowledge transfer;
- Partnerships in innovation in the sector;
- Access to assessments of technolgoies and innovation with the best chance of a positive impact to society;

Impacts and benefits to Academic users in the fields of [1] Feedstocks, pre-processing and safety; [2] Conversion; [3] Utilisation, emissions and impact; [4] Sustainability and Whole systems, include:
- Access to and collaboration in world-leading, transformative research, which advances knowledge concerning innovative bioenergy technologies, sustainability and social acceptability, and policy mechanisms for acheiving these;
- Development of new collaborations and leaverage of further funding to support their activities;
- Access to knowledge and expertise and networking and dissemination events;
- Research exchange opportunities for mutual benefit and cross-fertilisation of ideas and innovation
 
Description Found that there may be blends of advanced biofuel components that demonstrated their potential to be lower carbon alternatives to diesel whilst maintaining engine performance. However, there would need to be emissions mitigation strategies employed to ensure compliance with emissions standards. The influence of the fuel blend composition on the properties of the fuel has also been determined and predictive models produced. Complying with physical property limits was key for stable engine operation. To simulate the influence of changing the fuel composition on engine operation and combustion properties the simulations must include the physical processes occurring during engine operation in order to be fully representative. However, there are still significant influences of the chemical properties of the fuel components on the combustion properties and behaviours.
Exploitation Route The outcomes have highlighted and determined fuel blends that should be investigated further and used in vehicle testing to determine their suitability for existing vehicles. These existing vehicles could range from agricultural machinery to diesel vehicles used on the roads for personal transport and heavy-duty transport where diesel engines are commonplace. There would also need to be the development and optimisation of the biofuel production process to ensure large enough quantities of the biofuels can be produced in a cost effective and sustainable manner.
Sectors Agriculture

Food and Drink

Chemicals

Energy

Environment

Transport

 
Title Physical property models for the advanced biofuel blends 
Description Empirical models to predict different physical properties of blends of advanced biofuel components. Currently preparing for publication. 
Type Of Material Computer model/algorithm 
Year Produced 2021 
Provided To Others? No  
Impact Demonstrated the behaviour when blending the advanced biofuel components and the influence they have on the different physical properties. 
 
Description Reach for Excellence Workshops 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Schools
Results and Impact Online workshops to discuss my area of research and teach them some of the simple methods used. The aims were to demonstrate that STEM is for everyone, regardless of background. Also aimed to demonstrate the variety of research at the University.
Year(s) Of Engagement Activity 2021,2022