摘要
以处理量为1 800 m3/h的亚硫酸钠循环法烟气脱硫装置为实验对象,着重研究吸收液pH值、液气比L/G、吸收液成份和脱硫剂初始浓度等因素对脱硫效率的影响,并对脱硫剂再生过程和再生清液的脱硫特性进行研究.结果表明:吸收液pH值决定硫成份在溶液中的状态,从而影响脱硫效率,当pH>6时,脱硫效率高且随pH增大变化平缓;当pH<6时,脱硫效率随pH减少急剧降低;该工艺可以在较低的液气比(L/G=0.25～1.25 L/m3)下保持较高的脱硫效率(η>90%);同等条件下,与NaOH和Na2CO3相比较,Na2SO3的脱硫能力稍低;吸收液Na2SO3浓度在5%～10%范围内脱硫效率大于90%;脱硫剂再生反应过程能很快完成,再生脱硫剂脱硫效率稳定,与新鲜脱硫剂相比脱硫效率略低.
With the wet flue gas desulfurizer based on a sodium sulfite circulation method (processing capacity 1800 m/h) serving as an object of experimentation a detailed study was conducted of the impact of several factors on the desulfurization efficiency. Such factors include: pH value of absorption liquid, liquid/gas ratio, the initial composition of the absorption liquid and the initial concentration of a desulfurizing agent, etc. Furthermore, the regeneration process of the desulfurizing agent and the desulfurizing characteristics of the regenerated clean liquid were also studied. The results of the study indicate that the pH value of the absorption liquid can decide the state of sulfur element in a solution, thereby influencing the desulfurization efficiency. When pH is greater than 6, the desulfurization efficiency will be high and only change mildly with an increase in pH value. When pH is less than 6, the desulfurization efficiency will drastically decrease with a decrease in pH value. Under the present technological process it is possible to maintain a relatively high desulfurization efficiency (ηgreater than 90%) at a relatively low liquid-gas ratio (L/G=0.25-1.25 L/m3). Under equivalent conditions, as compared with NaOH and Na2CO3, the desulfurization capacity of Na2SO3 is slightly lower. When the concentration of the absorption liquid Na2CO3 is within the range of 5%-10% the desulfurization efficiency will be greater than 90%. The regeneration reaction process of the desulfurizer can be completed very rapidly. The desulfurization efficiency of the regenerated desulfurizing agent is stable. Compared with a fresh desulfurizing agent the desulfurization efficiency is slightly lower.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2005年第4期384-386,401,共4页
Journal of Engineering for Thermal Energy and Power
基金
广东省科技计划基金资助项目(A3040204)
关键词
烟气脱硫
亚硫酸钠
循环
flue gas desulfurization, sodium sulfite, cycle
