Complex Study of Straw Suitability for the Production of Nonindustrial Straw Pellets

0578770 - ÚCHP 2024 RIV US eng J - Journal Article
Zhovmir, M.M. - Moško, Jaroslav - Farták, J. - Jiříček, I. - Pohořelý, M.
Complex Study of Straw Suitability for the Production of Nonindustrial Straw Pellets.
ACS Omega. Roč. 8, č. 49 (2023), s. 47100-47112. ISSN 2470-1343. E-ISSN 2470-1343
Institutional support: RVO:67985858
Keywords : combustion * ash * reduction
OECD category: Energy and fuels
Impact factor: 4.1, year: 2022
Method of publishing: Open access
https://pubs.acs.org/doi/10.1021/acsomega.3c07057

Aims were achieved by straw soaking with heating to 100 °C and subsequent plug flow flashing with control of leaching completion by the absence of chlorine in leachate, studying the ash, chlorine, nitrogen, sulfur, and heavy metals content of straw, studying the thermal behavior of ash at heating, determining the initial deformation temperature (IDT) of ash, and comparing the properties of original and leached straw with the specification of straw pellets. Straw leaching until completion of chlorine washing-out provided decreasing chlorine, nitrogen, and sulfur contents below limitations, and the ash content decreased from 7.15 to 3.93% at water leaching to 4.29% at leaching with a 10% solution of acetic acid. In the ternary diagram, the composition of straw ash shifted from a zone of low melting eutectics to zones of high-melting tridymite and cristobalite. The IDT of the original straw ash was 847, 1250 °C after water leaching, and above 1275 °C after leaching with an acetic acid solution. Monitoring the absence of chlorine in the leaching liquid can be applied as a control parameter for straw leaching completion. The original straw was not suitable for the production of nonindustrial pellets because of the high contents of Cl, S, and Cr and the low IDT of ash. All indexes of straw were improved due to leaching, but the Cr content was above limitation. Producers of pellets need to assess straw suitability as to heavy metal content both in the original and leached states.
Permanent Link: https://hdl.handle.net/11104/0347685