Characteristic of the production of hydrogen-rich combustible gas by pyrolysis of high-ash sewage sludge

Pyrolysis is considered a promising way to treat sewage sludge and extract energy. This paper first studied the applicable conditions characteristics of high-ash (HASS) pyrolysis produce hydrogen-rich combustible gas. The yields three-phase products gas, tar, solid product HASS were determined. weight-loss behavior kinetic analyzed by thermogravimetric experiment. mainly decomposed at 540–901 °C weight loss rate was between 2.399 %?min?1 3.372 %?min?1. activation energies main decomposition process ranged from 137.081 198.673 kJ?mol?1. Devolatilization more likely occur than cracking macromolecular organic compounds minerals. Naphthalene occupies highest proportion ranging 18.88 61.15%. H2, CO2, CO, CH4 are major components H2 content lower heating value gas obtained with particle size 0.15–0.18 mm 800 °C, which most suitable condition for producing reached values 51.477% 13.960 MJ?m?3, respectively. cracking, decarboxylation, aromatization, cyclization matter in HASS.