Kinetic characteristics of high-pressure syngas release and spontaneous ignition at different temperatures

• Published in: Journal of loss prevention in the process industries 2022-07, Vol.77, p.104770, Article 104770
• Main Authors: Lu, Yawei, Guo, Pinkun, Wang, Zhirong, Liu, Chuipeng
• Format: Article
• Language: English
• Subjects: Initial temperature; Kinetic characteristics; Spontaneous ignition; Syngas; Turbulent kinetic energy
• ISSN: 0950-4230
• DOI: 10.1016/j.jlp.2022.104770

To investigate the effect of initial temperature, initial vessel pressure and the ratio of hydrogen in the syngas on the spontaneous ignition of high-pressure syngas release, a series of experiments was conducted. The influence law and mechanism of the spontaneous ignition was investigated. The experimental results showed that the pressure in the tube presented an oscillating rise and then a slow decline after high-pressure syngas release. The pressure peak (Pmax) in positions 1 and 2 were 3.215 MPa and 2.620 MPa respectively when the initial vessel pressure was 6.0 MPa. With the increase of the initial temperature and pressure, the syngas shock wave in the tube propagated faster and the pressure peak reached was higher. The Pmax in positions 1 and 2 increased from 1.900 MPa to 1.605 MPa–3.851 MPa and 3.385 MPa respectively with the initial vessel pressure increasing from 3.0 MPa to 7.0 MPa at a temperature of 20 °C. As the initial temperature increased, the critical pressure required for syngas to spontaneous ignition became lower. The numerical simulation results showed that the flow velocity and turbulent kinetic energy of the flow increased with the initial temperature, initial vessel pressure and the ratio of hydrogen in the syngas increased. The maximum temperature rose gradually and spontaneous ignition occurred in a forward direction. In addition, spontaneous ignition was more likely to occur in the tube. •The spontaneous ignition of high-pressure syngas release was investigated.•The pressure changes in the release tube were compared and analyzed in detail.•Kinetic characteristics at different initial temperature were explored in depth.•Critical conditions for the spontaneous ignition of syngas release were proposed.