EFFECT OF DESULFURIZATION WASTEWATER ADDITION ON MERCURY RELEASE CHARACTERISTICS DURING COAL COMBUSTION

WANG Hongliang; XU Yueyang; ZHONG Zhaoping; HAN Lei; HUANG Jiawei; XU Yuanqiang

doi:10.13205/j.hjgc.202211010

Volume 40 Issue 11

Nov. 2022

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WANG Hongliang, XU Yueyang, ZHONG Zhaoping, HAN Lei, HUANG Jiawei, XU Yuanqiang. EFFECT OF DESULFURIZATION WASTEWATER ADDITION ON MERCURY RELEASE CHARACTERISTICS DURING COAL COMBUSTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 69-77. doi: 10.13205/j.hjgc.202211010

Citation:

WANG Hongliang, XU Yueyang, ZHONG Zhaoping, HAN Lei, HUANG Jiawei, XU Yuanqiang. EFFECT OF DESULFURIZATION WASTEWATER ADDITION ON MERCURY RELEASE CHARACTERISTICS DURING COAL COMBUSTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 69-77. doi: 10.13205/j.hjgc.202211010

Citation:

WANG Hongliang, XU Yueyang, ZHONG Zhaoping, HAN Lei, HUANG Jiawei, XU Yuanqiang. EFFECT OF DESULFURIZATION WASTEWATER ADDITION ON MERCURY RELEASE CHARACTERISTICS DURING COAL COMBUSTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 69-77. doi: 10.13205/j.hjgc.202211010

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EFFECT OF DESULFURIZATION WASTEWATER ADDITION ON MERCURY RELEASE CHARACTERISTICS DURING COAL COMBUSTION

doi: 10.13205/j.hjgc.202211010

1. China Energy Science and Technology Research Institute Co., Ltd, Nanjing 210046, China;
2. College of Energy and Environment, Southeast University, Nanjing 210096, China;
3. State Key Laboratory of Clean and Efficient Coal-fired Power Generation and Pollution Control, Nanjing 210046, China

Received Date: 2021-10-13
Available Online: 2023-03-24

Abstract

Abstract

In this study, the combustion experiments of three kinds of coal at 1200℃ were implemented by using a drop-tube furnace and tubular furnace experimental devices respectively, to explore the effect of cchlorine-containing desulfurization wastewater addition on mercury release characteristics during coal combustion. In the experiment, the content of chlorine in coal was controlled by changing the mass fraction of simulated desulfurization wastewater solution to 0.00%, 0.02%, 0.04% and 0.06% respectively. Then by analysing the change of mercury concentration in flue gas, absorption solution, fly ash and coal ash after coal combustion, it was found that with the increase of chlorine dosage, the concentration of Hg⁰ in flue gas gradually decreased, while the concentrations of Hg²⁺ gradually increased. However, the effect of Hg^t concentration was subtle. When the chlorine dosage was 0.06%, the Hg⁰ concentration in the flue gas after coal type B was burned in the drop-tube furnace decreased by about 2.3 μg/m³, but the concentrations of Hg²⁺ increased by about 2.6 μg/m³, but the concentration of Hg^t only increased by 0.3 μg/m³. The addition of chlorine not only increased the mercury content in fly ash but also decreased the mercury content in coal ash. Through a comprehensive comparative analysis of the experimental results of drop-tube furnace and tubular furnace, it was found that the Hg⁰ ratio in the flue gas after coal combustion in drop-tube furnace was less than in tubular furnace, whether chlorine was added or not. When the chlorination amount of coal type B was 0.06%, the proportion of Hg⁰ after combustion in drop-tube furnace and tubular furnace was 50.6% and 67.8% respectively. In addition, it was also found that the mercury release rate of the three kinds of coal combustion after added chlorine in the tubular furnace was more obvious than that in drop-tube furnace. Therefore, the addition of chlorine-containing desulfurization wastewater solution could not only change the release characteristics of mercury during coal combustion, but also promoted the oxidation of Hg⁰ in flue gas, which played an important role in mercury removal from coal-fired flue gas.
- coal,
- desulfurization wastewater,
- mercury,
- release characteristic

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References(38)

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