Experimental Study on Influence of Fly Ash on Mercury Removal in Flue Gas with UV Light

2013 ◽  
Vol 864-867 ◽  
pp. 1546-1551
Author(s):  
Yin Xia Cao ◽  
Ji Hui Fang ◽  
Jiang Wu ◽  
Xian Li ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Uv Light ◽  
Mercury Content ◽  
Mercury Removal ◽  
Mercury Adsorption ◽  
Important Condition ◽  
Photocatalytic Effect ◽  
Photocatalytic Removal ◽  
Different Characteristics

The original fly ash samples fetched from the power plant and the treated fly ash samples after screening, magnetic separation and mixing were used in the experiment of photocatalytic removal on mercury in flue gas. The fly ash samples and the absorption solution after experiment were tested for mercury content. The results showed that different sizes of the original fly ash had different characteristics of photocatalytic removal of mercury. The adsorption of mercury by fly ash was an important condition for the occurrence of photocatalytic effect. When the mercury adsorption capacity of fly ash was stronger, the capacity of photocatalytic removal mercury was also greater. The presence of iron oxide on the fly ash surface can promote the capability of photocatalytic removal of mercury by fly ash. The presence of ultraviolet light can significantly promote Hg0 oxidize to Hg2+ by fly ash. Thus the oxidized mercury in the flue gas can be easily absorbed by the solution.

scholarly journals Mercury Removal From Coal Combustion Flue Gas by Pyrite-Modified Fly Ash Adsorbent

2021 ◽  
Author(s):  
Liqiang QI ◽  
Xu WANG ◽  
Wen WANG ◽  
Jingxin LI ◽  
Yan HUANG
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Coal Combustion ◽  
Gas Flow ◽  
Active Component ◽  
Mercury Removal ◽  
Gas Flow Rate ◽  
Mercury Adsorption ◽  
Mass Proportion ◽  
Modified Fly Ash

Abstract Pyrite and fly ash have certain advantages in adsorption and mercury oxidation. The pyrite-modified fly ash (PY+AC-FA) mercury adsorbent was prepared by mixing pyrite (PY) with acid-modified fly ash (AC-FA), which has better mercury removal effect than AC-FA. The experimental results of mercury adsorption show: when the reaction temperature is 50°C, the best doping proportion of modified fly ash is 20wt%, the mass proportion of pyrite to acid modified fly ash is 4:1, and the flue gas flow rate is 1.0L/min, the adsorbent has the best performance, and the adsorption rate of mercury reaches 91.92%. BET, XRD, SEM, TG-DSG and XRF were used to characterize these adsorbents. And the mechanism of mercury removal of pyrite-modified fly ash adsorbent is inferred: Hg0 is first adsorbed on the surface of the adsorbent, and then oxidized to HgS by the active component FeS2 in pyrite-modified fly ash.

scholarly journals Low-Cost Organic Adsorbents for Elemental Mercury Removal from Lignite Flue Gas

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2174
Author(s):  
Marta Marczak-Grzesik ◽  
Stanisław Budzyń ◽  
Barbara Tora ◽  
Szymon Szufa ◽  
Krzysztof Kogut ◽  
...  
Keyword(s):  
Flue Gas ◽  
Low Cost ◽  
Elemental Mercury ◽  
Mercury Content ◽  
Flue Gases ◽  
Mercury Removal ◽  
Gas Purification ◽  
Gas Temperature ◽  
Corn Straw ◽  
Flue Gas Purification

The research presented by the authors in this paper focused on understanding the behavior of mercury during coal combustion and flue gas purification operations. The goal was to determine the flue gas temperature on the mercury emissions limits for the combustion of lignites in the energy sector. The authors examined the process of sorption of mercury from flue gases using fine-grained organic materials. The main objectives of this study were to recommend a low-cost organic adsorbent such as coke dust (CD), corn straw char (CS-400), brominated corn straw char (CS-400-Br), rubber char (RC-600) or granulated rubber char (GRC-600) to efficiently substitute expensive dust-sized activated carbon. The study covered combustion of lignite from a Polish field. The experiment was conducted at temperatures reflecting conditions inside a flue gas purification installation. One of the tested sorbents—tire-derived rubber char that was obtained by pyrolysis—exhibited good potential for Hg0 into Hg2+ oxidation, resulting in enhanced mercury removal from the flue. The char characterization increased elevated bromine content (mercury oxidizing agent) in comparison to the other selected adsorbents. This paper presents the results of laboratory tests of mercury sorption from the flue gases at temperatures of 95, 125, 155 and 185 °C. The average mercury content in Polish lignite was 465 μg·kg−1. The concentration of mercury in flue gases emitted into the atmosphere was 17.8 µg·m−3. The study analyzed five low-cost sorbents with the average achieved efficiency of mercury removal from 18.3% to 96.1% for lignite combustion depending on the flue gas temperature.

Experimental Research on Fly Ash Modified Adsorption of Mercury Removal Efficiency of Flue Gas

2013 ◽  
Vol 800 ◽  
pp. 132-138 ◽  
Author(s):  
Li Li ◽  
Si Wei Pan ◽  
Jiang Jun Hu ◽  
Ji Fu Kuang ◽  
Min Qi ◽  
...  
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Physical Adsorption ◽  
Adsorption Properties ◽  
Mercury Removal ◽  
Immersion Method ◽  
Adsorption Temperature ◽  
Modified Fly Ash

Mercury in the flue gas in coal-fired power plant as the research object using halogen compound as the modified material, the fly ash was modified by chemical immersion method，Study on adsorption agent, the adsorption temperature, modified material and loading on mercury adsorption of flue gas in coal-fired power plants. Experiments showed that, iodine adsorption properties of modified fly ash was the most significant, with the increase of the sorbent dosage, Hg removal efficiency increased, fly ash adsorption amount of change was not obvious, between 80-140°C temperature range, fly ash on mercury existed mainly physical adsorption, the mercury removal efficiency decreased with the increase of temperature, chemical adsorption occurred at 160°C, mercury removal efficiency increased.

Surface modification of fly ash by non-thermal air plasma for elemental mercury removal from coal-fired flue gas

2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mengting Shi ◽  
Guangqian Luo ◽  
Hailu Zhu ◽  
Renjie Zou ◽  
Jingyuan Hu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Fly Ash ◽  
Flue Gas ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Air Plasma

Mercury Adsorption and Oxidation over Cobalt Oxide Loaded Magnetospheres Catalyst from Fly Ash in Oxyfuel Combustion Flue Gas

2015 ◽  
Vol 49 (13) ◽  
pp. 8210-8218 ◽  
Author(s):  
Jianping Yang ◽  
Yongchun Zhao ◽  
Lin Chang ◽  
Junying Zhang ◽  
Chuguang Zheng
Keyword(s):  
Fly Ash ◽  
Cobalt Oxide ◽  
Flue Gas ◽  
Mercury Adsorption ◽  
Oxyfuel Combustion

Mercury Removal from Coal Combustion Flue Gas by Fly Ash

2012 ◽  
pp. 395-399
Author(s):  
Junyan Kuang ◽  
Wenqing Xu ◽  
Tingyu Zhu ◽  
Pengfei Jing
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Coal Combustion ◽  
Mercury Removal

The secondary release of mercury in coal fly ash-based flue-gas mercury removal technology

2015 ◽  
Vol 37 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Jingfeng He ◽  
Chenlong Duan ◽  
Mingzhe Lei ◽  
Xuemei Zhu
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Coal Fly Ash ◽  
Mercury Removal ◽  
Removal Technology

Experimental Study of the Fly Ash Iron Morphology Effect on Flue Gas Mercury Removal

2013 ◽  
Vol 864-867 ◽  
pp. 1513-1518
Author(s):  
Can Li ◽  
Jin Hong Zhang ◽  
Jiang Wu ◽  
Xian Bing Zhang ◽  
Xian Tuo Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Species Distribution ◽  
Flue Gas ◽  
Power Plants ◽  
Magnetic Beads ◽  
Fixed Bed ◽  
Mercury Removal ◽  
Morphology Effect ◽  
Fixed Bed System

In this paper, magnetic beads were separated from two different power plants fly ash by magnetic separation, and the separated magnetic beads were analyzed by XRD. In a self-built fixed-bed system, the experiments that magnetic beads from two power plants, α-Fe2O3 and γ-Fe2O3 affect formation distribution of mercury in flue gas were carried out. The results showed that the magnetic beads in fly ash have a certain capacity to oxidize the mercury in flue gas, and the γ-Fe2O3 has greater influence on the species distribution of mercury than α- Fe2O3.

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