多相条件下亚硫酸钙氧化及pH、氧化还原电位（ORP）响应.pdf

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多相条件下亚硫酸钙氧化及pH、氧化还原电位(ORP)响应
马双忱,杨静,张立男,华继洲,温佳琪,高然
(华北电力大学(保定)环境学院,河北保定071003)
摘要:目日前脱硫浆液化控制方式主要为强制氧化且存在着脱硫系统结垢、氧化不充分和过氧化等一系列问题。
基于脱碗浆液的氰化过程为氧化还原反应的本质,为解決上述问题,本文提出了pI和氧化还原电位(ORP)双
控制策略。实验究了多相条件下亚碗酸鈣氣化过程中pll与ORP的响应,并深入分祈响应发生的机理。结果
表明:氧化过程中pH、()RP均表现出了非线性的变化特性,pH从碱性逐渐降低并趋于中性,由SC32离子的含
量決定。pH在线监测数据可以反映SO2离子的实际含量;ORP变化过程中的斜率存在一个“突跌”,“突送”
发生的时间与氧化率平台出现的时间大体对应。CaSO3的氧化主要发生在电位变化的前两个阶段,后两个阶段主
要发生溶的枳累和饱和。ORP短期上升随后稳定表明亚硫酸钙化达到稳定阶段。研究为脱碗泶液pI与ORP
氧化双控制的实施提供了理论基础。
关键词:脱硫浆液;亚硫酸钙氧化;pH与ORP双控制
中图分类号:X701文献标志码:A文章编号:1000-6613(2017)01-0383-08
D)0O1:10.16085/1sSn.1000-6613.2017.01.0)50
Sulfite oxidation under heterogeneous conditions and responses for ph
and oxidation reduction potential(ORP
MA Shuangchen, YAN( ing, ZAN( Iinan, ITUA izholl, WN agi, (AO Ran
(School of Environment, North China Electric ower University, Baoding 071003, Hebei, China
Abstract: Forced oxidation is a main slurry oxidation method in wet Flue gas desulfurization(WFGD)
and there exists a series problems, such as deposition and slagging in WFGD system, inadequate
oxidation and pcr-oxidation. Based on the naturc of redox rcaction in slurry oxidation proccss, this
paper puts forward PH and oxidation reduction potential( ORP)dual control strategy to solve the above
problcms. Thc rcsponsc for PH and OR P in calcium sulfite oxidation proccss was cxpcrimcntally study
of under heterogeneous conditions. the mechanism of response to the occurrence was analyzed in-depth
The results indicated that both PH and ORP showed a non-linear change characteristic in the oxidation
proccss. PH dctcrmincd by conccntration of SO; ions, tends to gradually rcducc from alkaline to
neutral PH monitoring data reflects the actual concentration of the SO; ions. There is a revulsion in
the ratio of OR P changes, and the time of the revulsion is accordance well with the platform of the
oxidation rate. Calcium sulfite oxidation occurred mainly in the first two slages of potential changes
and the dissolved oxygen accumulates and saturates in the ncxt two stagcs. ORP turns out subscqucntly
stcady aftcr a short-term risc, which demonstrates calcium sulfite oxidation reaching a stablc stage. TI
results provide an ellective theorelical basis for PH and ORP oxidation dual control in WF GD
Key words: desulfuri/ation slurry; calcium sulfite oxidation; PH and ORP oxidation dual contro
收稿日期:2016-05-30:修改稿日期:2016-06-24
要从事燃煤电厂燜气脱硫、脱硝、脱硫废水零排放技术方面的下作
第一作者及联系人:马双忱(1968-),男,教授,博士生导师,主
F-mail:msc1225(0:163.com
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