Abstract
PM10 generated from high-sodium coal combustion results in considerable ash deposition. A comparable occurrence may arise during high-sodium coal gasification. This work added NaCl and NaAc to the HCl acid-washed high-sodium coal to investigate their contributions to PM10 formation during entrained flow gasification. The PM10 from HCl acid-washed and NaAc-addition coal gasification showed a bi-modal distribution, while it exhibited a tri-modal one for the NaCl-addition coal. NaCl and NaAc increased PM10 production, but this increase is relatively minimal compared to coal combustion due to the lower Na release rate. NaCl formed more PM1 than NaAc because of variations in their transformation mechanisms. NaCl vaporized and directly formed flocculent PM with sizes less than 1 μm by nucleation/condensation without sulfation. NaAc was mainly released as Na atoms formed spherical PM with sizes less than 0.255 μm by hydrochlorination and nucleation/condensation. The simulations suggested that the faster release rate of NaCl than NaAc was the main reason for this phenomenon. Besides, simulation results also indicated that gasified refractory elements have a strong coagulative effect on NaCl and NaAc, which promoted particle growth and determined the location and peak of the PM1.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
