Simultaneous removal of NO/sub x/, SO/sub x/, and CO/sub 2/ at elevated temperature using a plasma-chemical hybrid process
Simultaneous removal of NO/sub x/, SO/sub x/, and CO/sub 2/ at elevated temperature using a plasma-chemical hybrid process
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DOI：
10.1109/tia.2002.802911
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发表时间：
2002-11
影响因子：
4.4
通讯作者：
Toshiaki Yamamoto;M. Okubo;T. Nagaoka;K. Hayakawa
中科院分区：
文献类型：
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作者：
Toshiaki Yamamoto;M. Okubo;T. Nagaoka;K. Hayakawa
在以往的研究中，作者证实，等离子体-化学组合的复合工艺控制NO烟气排放是非常有效的和经济的相比，传统的选择性催化还原（SCR）系统和其他技术。在本研究中，我们进行了实验上的同时去除NO/sub x/和SO/sub x/在高温下使用等离子体化学混合过程。进行了一系列实验来量化所有反应副产物，例如N/sub 2/O、CO、HNO/sub 2/、HNO/sub 3/、NO/sub 3//sup -/和SO/sub 4//sup -/，以评估同时NO/sub x/和SO/sub x/的去除效率。从NO到NO/sub 2/的氧化而不降低NO/sub x/浓度（即，最少的反应副产物）和最少的功率消耗是等离子体反应器最佳操作的关键。采用阻挡型填充床等离子体反应器和填充柱化学反应器，在Na/sub 2/SO/sub 3/或Na/sub 2/S存在和不存在NaOH的情况下，将产生的NO/sub 2/完全转化为N/sub 2/和Na/sub 2/SO/sub 4/。NO/sub 2/还原对Na/sub 2/S比Na/sub 2/SO/sub 3/更有效，但对Na/sub 2/S产生H/sub 2/S。对于这两种情况，完全还原NO/sub 2/至少需要化学计量量的五倍。同时脱除NO/sub 2/O和SO /sub 2/的效果接近100%，同时脱除CO/sub 2/的效果接近40%，且N/sub 2/O和CO的浓度均小于5 ppm，运行成本不到SCR工艺的1/4。可以取消额外的SO/sub 2/处理系统。
In previous studies, the authors confirmed that the plasma-chemical combined hybrid process for controlling NO flue gas emission was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and other technologies. In the present study, we carried out experiments on the simultaneous removal of NO/sub x/ and SO/sub x/ at elevated temperature using the plasma-chemical hybrid process. A series of experiments was performed to quantify all the reaction byproducts such as N/sub 2/O, CO, HNO/sub 2/, HNO/sub 3/, NO/sub 3//sup -/, and SO/sub 4//sup -/ to evaluate the simultaneous NO/sub x/ and SO/sub x/ removal efficiency. The oxidation from NO to NO/sub 2/ without decreasing NO/sub x/ concentration (i.e., minimum reaction byproducts) and with least power consumption is the key for the optimum operation of the plasma reactor. The produced NO/sub 2/ was totally converted to N/sub 2/ and Na/sub 2/SO/sub 4/ with Na/sub 2/SO/sub 3/ or Na/sub 2/S with and without NaOH using the barrier-type packed-bed plasma reactor followed by the packed-column chemical reactor. The NO/sub 2/ reduction was more effective for Na/sub 2/S than Na/sub 2/SO/sub 3/ but produces H/sub 2/S with Na/sub 2/S. For both cases at least five times the stoichiometric amount of chemicals were required for complete NO/sub 2/ reduction. Nearly 100% of NO/sub x/ and SO /sub 2/ and 40% Of CO/sub 2/ simultaneous removal were achieved with less than 5 ppm of N/sub 2/O and CO. The operating cost was less than 1/4 the SCR process. The additional SO/sub 2/ treatment system can be eliminated.