To elucidate the volatile dynamic release characteristics during co-pyrolysis of coal and biomass at high/medium temperatures and reveal the element evolution of pyrolysis gas

this study adopts fix-bed reactor to conduct pyrolysis of pine and Yanzhou coal at 800～1 200 ℃. Fourier infrared gas analyzer and hydrogen analyzer are used to detect the gas composition online

thus to explore the dynamic release characteristics of the gases. The results show that

the combustible gases in pyrolysis gas are mainly H2

CO and CH4. As the pyrolysis temperature rises

the production of H2 in the co-pyrolysis gas dramatically increases to 75.4 mg/g blend

the CO production slightly increases to 184.3 mg/g blend

while the CH4 production decreases. During the co-pyrolysis process

H2 comes out the latest and its release period is around 30～200 s. CO releases faster than CH4 and its release peak can go up to 61.1 μL/L. The main nitrogen-containing structure in the biomass are more unstable amino acids and proteins. Its gas evolutions of NH3 and HCN is faster but their release peaks are lower. Additionally

the synergistic effect in the co-pyrolysis of coal and biomass does not affect the release of CO and CH4. This study can provide some guidance for the future co-pyrolysis of coal and biomass and the utilization of low-carbon clean energy.