Thermal and chemical effects of water addition on laminar burning velocity of syngas
Thermal and chemical effects of water addition on laminar burning velocity of syngas
复制标题
加水对合成气层流燃烧速度的热化学影响
DOI：
10.1021/ef4020586
复制
发表时间：
2014
期刊：
影响因子：
5.3
通讯作者：
Zuohua Huang
中科院分区：
文献类型：
--
作者：
Yongliang Xie;Jinhua Wang;Nan Xue;Senbin Yu;Meng Zhang;Zuohua Huang
采用定容燃烧室和CHEMKIN软件包，对水蒸气对合成气层流燃烧速度的热力学和化学效应进行了实验和数值研究。在本研究中的实验条件下，CO/H2/空气/H2O混合物与合成气中的氢馏分从5%到50%，初始温度为373 K，压力为0.1和0.5 MPa，水稀释比从0%到30%。实验结果表明，当燃料中H2含量较低时，在低压和高压下，实验数据与计算值吻合较好。然而，当燃料中的H2/CO比率较高（75/25和95/05）时，所有三种机制都高估了富燃料混合物的层流燃烧速度。进行了敏感性分析，以确定实验数据和计算结果之间的差异的可能来源。此外，还研究了在不同CO/H2比下，水对层流燃烧速度的化学影响。对于CO/H2比为50/50的合成气，水对反应的抑制作用较弱。对于较高的CO/H2比，水的加入加速了化学反应，这种积极的影响变得更加显着的CO/H2比增加的合成气。使用消费路径分析解释了不同的趋势。
An experimental and numerical study on thermal and chemical effects of water vapor addition on the laminar burning velocities of syngas was conducted using a constant-volume chamber and CHEMKIN package. The experimental conditions in the present study for CO/H2/air/H2O mixtures with hydrogen fraction in syngas were from 5% to 50%, initial temperature of 373 K, pressures of 0.1 and 0.5 MPa and water dilution ratios from 0% to 30%. The measured laminar burning velocity data were compared with simulations with three mechanisms, the San Diego mechanism and those of Davis et al. and Li et al. The experimental data showed a reasonable agreement with the calculated values at low and high pressures when the content of H2in the fuel was low. However, when H2/CO ratio in the fuel was higher (75/25 and 95/05), all three mechanisms overpredicated the laminar burning velocity for fuel-rich mixtures. Sensitivity analysis was performed to identify the possible sources of discrepancy between the experimental data and calculated results. Furthermore, chemical effects of H2O on the laminar burning velocities at various CO/H2ratios when water was added into the mixtures were studied. For syngas with CO/H2ratio of 50/50, water had a weak inhibiting effect on the chemical reaction of the mixtures. For the higher CO/H2ratios, water addition accelerated the chemical reaction and this positive effect became more significant for the syngas with the increased CO/H2ratio. Different trends were explained using the consumption path analysis.