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亚氯酸钠溶液烟气脱硝与烟气余热回收的一体化试验

王静贻 高庆有 徐熙 赵玺灵 付林

王静贻, 高庆有, 徐熙, 赵玺灵, 付林. 亚氯酸钠溶液烟气脱硝与烟气余热回收的一体化试验[J]. 环境科学研究, 2017, 30(11): 1754-1760. doi: 10.13198/j.issn.1001-6929.2017.02.98
引用本文: 王静贻, 高庆有, 徐熙, 赵玺灵, 付林. 亚氯酸钠溶液烟气脱硝与烟气余热回收的一体化试验[J]. 环境科学研究, 2017, 30(11): 1754-1760. doi: 10.13198/j.issn.1001-6929.2017.02.98
WANG Jingyi, GAO Qingyou, XU Xi, ZHAO Xiling, FU Lin. Removal of NOx form Flue Gas by Integration NaClO2 Solution and Surplus Heat Recovery[J]. Research of Environmental Sciences, 2017, 30(11): 1754-1760. doi: 10.13198/j.issn.1001-6929.2017.02.98
Citation: WANG Jingyi, GAO Qingyou, XU Xi, ZHAO Xiling, FU Lin. Removal of NOx form Flue Gas by Integration NaClO2 Solution and Surplus Heat Recovery[J]. Research of Environmental Sciences, 2017, 30(11): 1754-1760. doi: 10.13198/j.issn.1001-6929.2017.02.98

亚氯酸钠溶液烟气脱硝与烟气余热回收的一体化试验

doi: 10.13198/j.issn.1001-6929.2017.02.98
基金项目: 

自然科学基金委创新群体基金项目 51521005

详细信息
    作者简介:

    王静贻(1988-), 女, 广东湛江人, jwang759@163.com

    通讯作者:

    付林(1968-), 男, 山东东营人, 教授, 博士, 博导, 主要从事城市能源规划、烟气治理利用研究, fulin@mail.tsinghua.edu.cn

  • 中图分类号: X511

Removal of NOx form Flue Gas by Integration NaClO2 Solution and Surplus Heat Recovery

Funds: 

 51521005

  • 摘要: 锅炉烟气中的NOx是大气污染的重要原因之一.针对燃气锅炉NOx超低排放的要求以及烟气中大量余热被浪费的现状,提出了烟气脱硝与余热回收一体化的新方法,通过搭建一体化试验台,分析在烟气余热回收的条件下,c[NaClO2(亚氯酸钠)]、液气比、喷淋水温度等因素对脱硝效率以及烟气余热回收效率的影响.烟气脱硝与余热回收一体化的新方法主要体现在逆流式烟气喷淋塔中,可利用NaClO2溶液对低φ(NOx)的烟气脱硝并同时回收烟气余热.试验结果表明,c(NaClO2)越高、pH越低、液气比越大,NaClO2溶液脱硝率越高.当c(NaClO2)为0.020 0 mol/L、喷淋水温度在30~80℃之间变化时,存在最优的喷淋水温度64℃,使脱硝率最高为36%.同时,液气比及喷淋水温度对余热回收效果影响显著,液气比越大、喷淋水温度越低,余热回收效果越好.试验结果还显示了当烟气温度为83℃、喷淋水温度为48℃、c(NaClO2)为0.015 0~0.020 0 mol/L、液气比为13.8 L/m3时,烟气脱硝效率约为40%,同时回收了26.4 kW的烟气余热.研究显示,在逆流式烟气喷淋塔中,利用NaClO2溶液进行烟气脱硝并同时回收烟气余热的一体化方法是可行的,可应用于工程实践.

     

  • 图  1  NaClO2溶液烟气脱硝与烟气余热回收一体化试验系统

    Figure  1.  The systematic diagram of the experiment apparatus for the integration of removal of NOx with NaClO2 solution and the recovery of flue gas surplus heat

    图  2  不同c(NaClO2)条件下反应时间对NO氧化率的影响

    c(NaClO2)/(mol/L):1—0.007 5;2—0.010 0;3—0.012 0;4—0.015 0;5—0.0200;6—0.025 0.

    Figure  2.  The influence of reaction time on NO oxidation ratio with different c(NaClO2)

    图  3  不同c(NaClO2)条件下反应时间对NOx脱除率的影响

    c(NaClO2)/(mol/L):1—0.007 5;2—0.010 0;3—0.012 0;4—0.015 0;5—0.020 0;6—0.025 0.

    Figure  3.  The influence of reaction time on de-NOx efficiency with different c(NaClO2)

    图  4  c(NaClO2)对NO氧化率、NOx脱除率的影响

    Figure  4.  The influence of c(NaClO2) on NO oxidation ratio and de-NOx efficiency

    图  5  初始pH对NO氧化率、NOx脱除率的影响

    Figure  5.  The influence of initial pH on NO oxidation ratio and de-NOx efficiency

    图  6  液气比对NO氧化率、NOx脱除率的影响

    Figure  6.  The influence of liquid to gas ratio on NO oxidation ratio and de-NOx efficiency

    图  7  液气比对烟气余热回收量、换热效率的影响

    Figure  7.  The influence of liquid to gas ratio on surplus heat recovery and heat exchange efficiency

    图  8  喷淋水温度对NO氧化率、NOx脱除率的影响

    Figure  8.  The influence of spray water temperature on NO oxidation and de-NOx efficiency

    表  1  烟气余热回收与脱硝一体化系统试验条件

    Table  1.   Operation conditions of the integrated experiment of de-NOx and surplus heat recovery of flue gas

    控制变量 控制变量变化范围 其他参数
    c(NaClO2)/(mol/L) 0.007 5~0.025 0 φ(NO)=29×10-6φ(NO2)=1.7×10-6φ(NOx)=30.7×10-6,喷淋水温度为48 ℃,初始pH为9,液气比为12.6 L/m3,烟气入口温度为83 ℃
    初始pH 5~11 φ(NO)=29×10-6φ(NO2)=2.3×10-6φ(NOx)=31.3×10-6c(NaClO2)为0.015 0 mol/L,喷淋水温度为48 ℃,液气比为13.8 L/m3,烟气入口温度为83 ℃
    液气比/(L/m3) 5~15 φ(NO)=29×10-6φ(NO2)=2.6×10-6φ(NOx)=31.6×10-6c(NaClO2)为0.020 0 mol/L,喷淋水温度为48 ℃,初始pH为9,烟气入口温度为83 ℃
    喷淋水温度/℃ 30~80 φ(NO)=25×10-6φ(NO2)=1.5×10-6φ(NOx)=26.5×10-6c(NaClO2)为0.020 0 mol/L,初始pH为9,液气比为12.6 L/m3,烟气入口温度为83 ℃
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  • 收稿日期:  2017-02-07
  • 修回日期:  2017-07-04
  • 刊出日期:  2017-11-25

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