Co-pyrolysis of agricultural waste and estimation of pyrolysis applicability in the integrated technology of biorenewable hydrogen production

For the production of biorenewable hydrogen, the possibility of using pyrolysis of agricultural waste, namely cow dung and stems of weeds Amaranthus retroflexus L. (AR), as well as their mixtures in a ratio of 1:1, 2: 1 and 4:1, was investigated. Thermogravimetric analysis was carried out at a heating rate of 10°C / min in the temperature range from 40°C to 1000°C. It was shown that the thermal decomposition of agricultural waste in an inert environment is characterized by three main stages, the most significant of which is in the temperature range from 145 to 410 C, at which the maximum yield of volatile components occurs. Pyrolysis was carried out at a temperature of 550°C and a heating rate of 10°C / min. During the pyrolysis of a mixture of agricultural waste, the material balance was on aver-age as follows: 36.95% pyrolysis liquid, 24.99% syngas and 38.06% biochar, and the maximum hydrogen concentra-tion in the resulting pyrolysis gas was 21.17% with cow dung to AR ratio of 4:1. With this ratio, the hydrogen yield was 12.1% higher than when using a mixture with a 1: 1 ratio. An increase in the AR fraction enriched the pyrolysis liquid with phenolic compounds. The high content of fixed carbon (47.52%) in biochar is attractive for its use as soil additives. For further research on increasing the yield of gaseous hydrogen from biomass, a scheme of bio-thermochemical processing was proposed, involving a combination of dark fermentation and pyrolysis.

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