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Kinetic behaviour of iron oxide sorbent in hot gas desulfurization

机译：氧化铁吸附剂在热气脱硫中的动力学行为

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Although a number of reports on sorbents containing ZnO for H_2S removal from coal-derived gases can be found in the literature, it is shown in our study that a special sorbent containing Fe_2O_3-FeO (SFO) with minor promoters (Al_2O_3, K_2O, and CaO) as the main active species is more attractive for both sulfidation and regeneration stages, also under economic considerations. This paper presents the kinetic behaviour of SFO in a hot gas desulfurization process using a thermogravimetric analysis under isothermal condition in the operating range between 500 and 800 deg C. The gas stream was N_2 with a 2 percent wt of H_2S. Experiences carried out on sorbent sulfidation with SFO (particle sizes in the range of 0.042-0.12 mm) indicate that the sorbent sulfidation capacity sharply increases with temperature in the range of 500-600 deg C. It is also shown that the sample weight reaches its maximum absorption capacity, near saturation, at 600 deg C so that it makes no sense to increase the sulfidation temperature from this point. To make a comparison between SFO and a zinc titanate based sorbent, a set of sulfidation tests was carried out at 600 deg C during 7200 s using the same sieve range for both sorbents between 42 and 90 mu m. Results show that the sulfidation capacity of SFO is 1.9 times higher than that of zinc titanate.
机译：尽管在文献中发现了许多有关从煤衍生气体中去除H_2S的含ZnO吸附剂的报道，但我们的研究表明，一种含Fe_2O_3-FeO（SFO）且具有少量助催化剂（Al_2O_3，K_2O和出于经济考虑，作为主要活性物质的CaO）在硫化和再生阶段都更具吸引力。本文介绍了在等温条件下，在500至800摄氏度的工作温度范围内，通过热重分析在热气体脱硫过程中SFO的动力学行为。气流为N_2，H_2S含量为2％。用SFO进行吸附剂硫化的经验（粒径在0.042-0.12 mm范围内）表明，吸附剂的硫化能力随温度在500-600℃范围内的增加而急剧增加。在600摄氏度时达到最大吸收容量（接近饱和），因此从这一点开始提高硫化温度没有任何意义。为了在SFO和钛酸锌基吸附剂之间进行比较，在600摄氏度下于7200 s内进行了一套硫化试验，两种吸附剂的筛分范围相同，在42至90μm之间。结果表明，SFO的硫化能力是钛酸锌的1.9倍。

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