脱硫脱氮吸附剂上的硫经催化裂化反应后的分布研究

RESEARCH ON THE DISTRIBUTIONS OF SULFUR ON ADSORBENT FOR REMOVING SO_x AND NO_x AFTER CATALYTIC CRACKING REACTIONS

在固定流化床(FFB)实验装置上考察烟气脱硫脱氮吸附剂上的硫在催化裂化反应过程中的分布和形态以及吸附剂的催化裂化反应性能。研究结果表明:在催化裂化反应环境中吸附在催化剂上的硫有80%以上发生脱附,并分布在液体产物、裂化气、预流化水以及雾化汽提水中,分布比例分别为2.6%,41.5%,27.2%,2.8%;液体产物中的硫主要为烷基噻吩、噻吩、硫醇和硫醚,裂化气中的硫为H2S,水中的硫以SO24-,SO23-,S,S2O23-,S2-等形态存在;吸附剂对烃类的催化裂化反应性能没有明显影响。

An investigation was carried out on a fixed-fluidized bed reactor system to study the distributions and forms of sulfur deposited on adsorbent for removing SOx and NOx in flue gas through catalytic cracking,and the catalytic cracking performance of the adsorbent was studied as well.Results show that during catalytic cracking reactions,more than 80% of the sulfur deposited on the adsorbent could be desorbed and distributed into liquid product,cracking gas,pre-fluidized water and atomizing/stripping water with mass fractions of 2.6%,41.5%,27.2% and 2.8%,respectively.The sulfur in liquid product is mainly existed as alkyl thiophene,thiophene,mercaptan and thioether;the sulfur in cracking gas is existed as H2S;the sulfur in condensed water is mainly existed as SO2-4,SO2-3,S,S2O2-3 and S2-.However,it seems that the presence of adsorbent do not have significant effect on the catalytic cracking of hydrocarbons.