石灰石高温煤气脱硫的试验研究

采用天然石灰石做脱硫剂，在固定床上进行硫化氢高温脱除的试验研究，考察了脱硫剂粒径、反应温度、气速及高温煤气中H2对石灰石脱硫性能的影响，同时还用热重分析(TG)、扫描电镜(SEM)、X-射线衍射(XRD)等测试手段对脱硫剂的物相组成和结构等进行了表征。结果表明，脱硫剂的粒径对脱硫效果的影响很大，0.38～0.83 mm的石灰石脱硫效果最佳；温度对脱硫效果的影响比较复杂，最佳的操作温度为850℃；气速对脱硫效果的影响较明显，脱硫剂的穿透时间随气速的减小而加长；H₂对脱硫过程起阻碍作用，气速越小，这种阻碍作用越明显。

Experimental study of hot gas desulphurization with limestone sorbent

Natural limestone was adopted as a high-temperature desulfurization sorbent. Tests for removal of H_2S with limestone at high temperatures were carried out in a fixed bed reactor. The effects of reaction temperature, gas velocity, particle size and H_2 in hot gas on the desulfurization performance were tested. The structure and composition were also studied by thermogravimetry (TG) , scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is showed that the particle size has a great influence on desulfurization performance. The limestone of 0. 38～0. 83 mm has the best desulfurization effect; the temperature has a complicated influence on desulfurization performance, the desulfurization sorbent has the best desulfurization effect at 850 ℃ ; gas velocity also has a distinct influence on desulfurization performance, desulfurization breakthrough time becomes longer as the gas velocity decreases; H_2 can inhibit the desulfurization process, it is more obvious as the gas velocity decreases.