CIESC Journal ›› 2019, Vol. 70 ›› Issue (4): 1559-1566.doi: 10.11949/j.issn.0438-1157.20181311

• Energy and environmental engineering • Previous Articles     Next Articles

Distribution characteristics of mercury speciation in coals with three different ranks

Yinjiao SU1(),Xuan LIU1,Lifeng LI2,Xiaohang LI1,Ping JIANG2,Yang TENG1,Kai ZHANG1()   

  1. 1. Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
    2. Shanxi Hepo Power Generation Company Limited, Yangquan 045011, Shanxi, China
  • Received:2018-11-12 Revised:2019-01-11 Online:2019-04-05 Published:2019-01-21
  • Contact: Kai ZHANG E-mail:suyinjiaosu@163.com;kzhang@ncepu.edu.cn

Abstract:

The occurrence and thermal stability of mercury in six samples of three coal ranks in two coal fields were studied by stepwise chemical extraction method and temperature programmed pyrolysis method. The results show that mercury in coal can be divided into five fractions: exchangeable mercury (F1), carbonate+sulfate+oxide bound mercury (F2), silicate+aluminosilicate bound mercury (F3), sulfide bound mercury (F4) and residual mercury (F5). Among them, F2, F4 and F5 account for over 90%, especially F4 ranges from 45.2% to 82.1%. Mercury speciation is heavily related to coal rank in this study. The proportion of F4 is significantly increased with increasing the degree of coalification, whilst both F2 and F5 are gradually decreased, which can be inferred that mercury combined with carbonate, sulfate and organic matter transfer to the sulfide during the metamorphic process of coal. The thermal release characteristics of mercury in coal depend on its speciation. F1 has the weakest thermal stability which completely releases when the temperature is lower than 150℃, but F3 is the strongest with the release temperature above 600℃. The release temperature of the other mercury species is between F1 and F3. As a result, the order of release temperature is F1 < F5 < F2 < F4 < F3. Based on the above findings, it should be an effective method to transform mercury into much more sulfide with stable state for stabilizing mercury speciation in liquid and solid by-products of coal combustion and other related processes.

Key words: mercury, speciation, coal rank, pyrolysis, stability, leaching, distribution

CLC Number: 

  • TQ 53

Table 1

Proximate analysis and mercury content of samples"

样品煤田产地工业分析/%(质量)

汞含量/

(ng/g)

MadAadVadFCad
L1

宁武煤田

朔州王坪1.1835.6727.7235.43292.6
L2朔州安太堡3.2928.2328.1840.30228.7
B1原平轩岗2.9422.5721.2353.26175.3
B2

沁水煤田

阳泉盂县1.3318.2411.5268.91138.5
A1阳泉上社1.4218.1810.2670.14186.3
A2阳泉上社1.4315.508.4974.58105.1

Fig.1

Schematic diagram of temperature-programmed-decomposition experimental system"

Fig.2

Schematic diagram of sequential-chemical-extraction procedure"

Fig.3

Thermogram of Hg in coals with three different ranks"

Fig.4

Distribution characteristics of five Hg species in coals with three different ranks"

Fig.5

Thermogram for five Hg species"

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