Effects of additives on stabilization and inhibition of mercury re-emission in simulated wet gas desulphurization slurry

MAO Lin; ZHANG Zhi-yue; SUN Jia-xing; QI Dong-xu; CHEN Yi-peng; YANG Hong-min

Volume 46 Issue 10

Oct. 2018

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Article Navigation > Journal of Fuel Chemistry and Technology > 2018 > 46(10): 1265-1271

MAO Lin, ZHANG Zhi-yue, SUN Jia-xing, QI Dong-xu, CHEN Yi-peng, YANG Hong-min. Effects of additives on stabilization and inhibition of mercury re-emission in simulated wet gas desulphurization slurry[J]. Journal of Fuel Chemistry and Technology, 2018, 46(10): 1265-1271.

Citation:

MAO Lin, ZHANG Zhi-yue, SUN Jia-xing, QI Dong-xu, CHEN Yi-peng, YANG Hong-min. Effects of additives on stabilization and inhibition of mercury re-emission in simulated wet gas desulphurization slurry[J]. Journal of Fuel Chemistry and Technology, 2018, 46(10): 1265-1271.

Citation:

MAO Lin, ZHANG Zhi-yue, SUN Jia-xing, QI Dong-xu, CHEN Yi-peng, YANG Hong-min. Effects of additives on stabilization and inhibition of mercury re-emission in simulated wet gas desulphurization slurry[J]. Journal of Fuel Chemistry and Technology, 2018, 46(10): 1265-1271.

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Effects of additives on stabilization and inhibition of mercury re-emission in simulated wet gas desulphurization slurry

School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China

Funds:

the National Natural Science Foundation of China 51676101

Natural Science Foundation of Jiangsu Province BK20161558

More Information

Corresponding author: YANG Hong-min, E-mail:62055@njnu.edu.cn
Received Date: 2018-03-06
Rev Recd Date: 2018-07-19

Available Online: 2021-01-23

Publish Date: 2018-10-10

Abstract

Abstract

In view of the problem of mercury re-emission in wet flue gas desulfurization system, Na₂S, 2, 4, 6-trimercaptotiazine trisodium (TMT-18), sodium dithiocarbamate (DTCR-2) and Fenton reagents were added into the desulfurization slurry to study their effects on mercury re-emission. The results show that the 4 additives could effectively inhibit the mercury re-emission. 1.0 time stoichiometric ratio of Na₂S is enough to combine with Hg²⁺ in the slurry into HgS. Thereby the ratio of mercury re-emission reduces to 5.27%. The optimum dosage of heavy metal chelating agents TMT-18 and DTCR-2 are 3.0 and 1.0 time stoichiometric ratio. They combine with Hg²⁺ to form organic chelate mercury and then fix it. So the ratio of mercury re-emission reduces to 5.09% and 4.62%, respectively. After adding Fenton reagent with a strong oxidizing into the slurry, the ratio of reduced mercury reduces to only 2.31% when H₂O₂ concentration is 0.3 mol/L and the ratio of[Fe²⁺]/[H₂O₂] is 1:8. Fenton reagent has the best effect on mercury re-emission in the simulated wet gas desulphurization slurry among 4 additives.
- Na₂S,
- TMT-18,
- DTCR-2,
- Fenton reagent,
- mercury re-emission,
- WFGD

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References(14)

References

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