The CHEC (Combustion and Harmful Emission Control) Research Centre at the Department of Chemical Engineering of the DTU carries out research in fields related to chemical reaction engineering and combustion, with the focus on high temperature processes, formation and control of harmful emissions, and particle technology. CHEC has achieved international recognition through a combination of experiments and modeling. The models are often validated by pilot-scale and/or full-scale experiments or pilot-scale and/or full-scale measurements are used as a source of inspiration for the long term research. This way strong cooperation is secured between the university and industrial partners. The CHEC laboratories are well equipped and include equipment for gas adsorption and mercury porosimetry, particle size distribution measurements, simultaneous thermogravimetric and differential scanning calorimetric, and ash viscosity measurements. A number of reactors from lab- to pilot-scale are available, used to characterize and investigate fixed bed, entrained flow and fluid bed combustion processes, emissions formation, ash formation and deposition, and low temperature flue gas cleaning. CHEC is conducting a considerable research program in combustion and harmful emission control, with particular emphasis on renewable fuels.