金属氧化物吸附剂干法脱除气相 As2O3实验研究

摘要

利用自制 As2 O3连续发生装置，在固定床反应器上研究了金属氧化物 CaO、F e2 O3、Al2 O3对煤燃烧高温烟气中气相砷的吸附特性。600～900℃温度的吸附实验结果表明，金属氧化物 CaO、Fe2 O3吸附剂对气相 As2 O3的吸附以化学吸附为主，随着吸附温度的升高，吸附量与吸附效率逐渐减小；3种金属氧化物的气相固砷能力依次为 Fe2 O3＞CaO＞Al2 O3；研究了气相砷浓度对吸附剂固砷量的影响特性，当气相砷体积浓度在4．5×10－6～13．5×10－6变化时，不会有吸附饱和的现象发生，当吸附剂种类一定时，吸附效率仅与吸附温度有关，对于不同气相砷浓度保持相同的吸附温度可以获得相同的吸附效率。%The adsorption of gas-phase As2 O3 by metal oxides like CaO, Fe2 O3 and Al2 O3 was investigated in a fixed bed reactor with an arsenic continuous generation facility.The results indicated that the adsorption of As2 O3 on metal oxides is dominated by chemical adsorption at a temperature between 600 and 900 ℃; the adsorption quantity and efficiency are de creased with the increase of temperature.The arsenic adsorption ability of three metal oxide follows the order of Fe2 O3 >CaO >Al2 O3 .The saturation adsorption phenomenon will not occur under the current conditions with the concentration of arsenic in the gas phase in the range between 4.5×10-6 and 13.5 ×10-6 ( volume rati o); the adsorption efficiency for each adsorbent is only affected by the adsorption temperature and the same adsorption efficiency can be achieved with different arsenic concentrations.