PhD scholarship in Ash-Bed Interactions and Agglomeration in Biomass-fired Fluidized Bed Boilers DTU Chemical Engineering

Are you interested in biomass combustion ash chemistry and experimental and modelling research on high-temperature processes This PhD project offers an opportunity to investigate bed material transformation agglomeration and defluidization in biomass-fired fluidized bed boilers.

Bed agglomeration is a major operational challenge in fluidized bed combustion. Interactions between biomass ash gaseous alkali species and bed materials can lead to the formation of low-melting compounds potentially resulting in unstable fluidization and in severe cases unplanned boiler shutdowns.

The project is a collaboration between DTU Chemical Engineering and Ørsted. Its overall objective is to improve the fundamental understanding of ashbed interactions and develop experimental and modelling tools for evaluating agglomeration risk improving bed material management and supporting the use of biomass fuels of lower or more variable quality.

The project combines laboratory-scale fluidized-bed experiments high-temperature gas-solid reaction experiments advanced material characterization thermodynamic equilibrium calculations and chemical kinetic modelling. You will work with both model compounds and industrial bed materials and interact closely with researchers technical staff and industrial specialists. The project will maintain close links between fundamental research and industrial applications.

Responsibilities and qualifications
Your primary tasks will include:

• Investigating alkali interactions with bed materials under high-temperature conditions
• Characterizing bed material transformation coating formation and melting behaviour
• Developing and validating models of high-temperature alkali chemistry and ashbed interactions
• Studying agglomeration and defluidization mechanisms and mitigation strategies
• Translating the scientific findings into recommendations for industrial fluidized bed boiler operation and fuel management
• Publishing your research in peer-reviewed scientific journals and presenting it at international conferences

You are a highly motivated candidatewith a background in chemical engineering energy engineering materials science chemistry mechanical engineering process engineering or a related field.

Experience in one or more of the following areas will be an advantage:

• Biomass combustion or fluidized bed processes
• Ash chemistry
• High-temperature experimental work
• Characterization of ash or related materials
• Thermodynamic equilibrium calculations
• Chemical kinetic or gassolid reaction modelling

You should be interested in combining experimental work and modelling and applying fundamental research to industrial challenges. You should be able to work independently and collaborate effectively with academic and industrial partners. Good written and spoken English skills are required.

You must have a two-year masters degree (120 ECTS points) or a similar degree with an academic level equivalent to a two-year masters degree.

Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme please see DTUs rules for the PhD education.

Assessment
The assessment of applicants will be made by Prof. Hao Wu and Senior Researcher Anne Juul Damø from DTU Chemical Engineering.

We offer
DTU is a leading technical university globally recognized for the excellence of its research education innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.

Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union. The period of employment is 3 years.

The PhD project is expected to start on 1^st December 2026.

You can read more about career paths at DTU here.

Further information
Further information may be obtained from Prof. Hao Wu ().

You can read more about at

If you are applying from abroad you may find useful information on working in Denmark and at DTU at DTU Moving to you have the option of joining our monthly free seminar PhDrelocation to Denmark and startup Zoom seminar for all questions regarding the practical matters of moving to Denmark and working as a PhD at DTU.

Application procedure
Your complete online application must be submitted no later than27 September 2026 (23:59 Danish time).

Applications must be submitted as one PDF file containing all materials to be given consideration. To apply please open the link Apply now fill out the online application form and attach all your materials in English in one PDF file. The file must include:

• A letter motivating the application (cover letter)
• Curriculum vitae
• Grade transcripts and BSc/MSc diploma (in English) including official description of grading scale

You may apply prior to obtaining your masters degree but cannot begin before having received it.

Applications received after the deadline will not be considered.

All interested candidates irrespective of age gender disability race religion or ethnic background are encouraged to apply. As DTU works with research in critical technology which is subject to special rules for security and export control open-source background checks may be conducted on qualified candidates for the position.

The Department of Chemical and Biochemical Engineering at DTU is a leader in innovative teaching and research built on core technical subjects and engineering scientific disciplines. The teaching and research cover separation processes bioprocesses bioengineering bioconversions reaction engineering dynamics and process regulation process and facility planning unit operations a.o. The Department enjoys very close relations with international partners and especially a wide range of industrial companies

DTU For the benefit of society since 1829
DTU is one of Europes leading elite technical universities. Through research and education at an international top level we create solutions to the major societal challenges of our time and help secure Europes global leadership in sustainable technological development. Since Hans Christian Ørsted founded DTU almost 200 years ago our mission has remained the same: We develop and create value through the natural and technical sciences for the benefit of society. DTU has 13800 students 1600 PhD students and 6500 employees. We work in an international environment and have an inclusive stimulating and informal work culture. DTU has campuses in all parts of Denmark and in Greenland and collaborates with the best universities around the world.