Coal includes a percentage of chlorine, fluorine, and sulfur compounds. When the coal is combusted, corrosive acids are released by these compounds, for instance, hydrofluoric acid is formed by fluorine compounds.
Therefore, thermal power plants need to use low-fluorine coal in order to prevent the formation of hydrofluoric acid on a massive scale. This article covers the determination of the fluorine content in a coal sample after hydropyrolysis using ion chromatography.
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Sample
Coal
Sample preparation
In this work, the sample analysis is performed by Metrohm Combustion IC with flame sensor technology and intelligent Partial Loop Injection Technique with Inline Matrix Elimination.
Columns
|
Metrosep A Supp 5 - 150/4.0
|
6.1006.520
|
|
Metrosep A Supp 4/5 Guard/4.0
|
6.1006.500
|
|
Metrosep A PCC 1 HC/4.0
|
6.1006.310
|
|
Metrosep A Trap 1 - 100/4.0
|
6.1014.000
|
|
Metrosep I Trap 1 - 100/4.0
|
6.1014.200
|
Solutions
|
Eluent
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3.2 mmol/L sodium carbonate 1.0 mmol/L sodium hydrogen carbonate
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Suppressor regenerant
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100 mmol/L sulfuric acid
|
|
Rinsing solution
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STREAM
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Absorber solution
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200 mg/L hydrogen peroxide
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Parameters
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Flow rate
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0.7 mL/minutes
|
|
Injection volume (IC)
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50 μL (MiPT)
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|
Pmax
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15 MPa
|
|
Recording time
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12 minutes
|
|
Column temperature
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30 °C
|
Combustion parameters
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Argon
|
100 mL/minutes
|
|
Oxygen
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300 mL/minutes
|
|
Oven temperature
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1100 °C
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Post-combustion time
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400 s
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Initial volume of absorption solution
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2.0 mL
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|
Water inlet
|
0.2 mL/minutes
|
Analysis
Conductivity after the sequential suppression
Instrumentation
|
930 Compact IC Flex Oven/SeS/PP/Deg
|
2.930.2560*
|
|
IC Conductivity Detector
|
2.850.9010*
|
|
MSM Rotor A
|
6.2832.000*
|
|
Adapter sleeve for Suppressor Vario
|
6.2842.020*
|
|
920 Absorber Module
|
2.920.0010*
|
|
Combustion Module (oven and ABD)
|
2.136.0700*
|
|
Autosampler MMS 5000
|
2.136.0800
|
|
Kit for solid sampling
|
6.7302.000
|
* Available as 930 Metrohm Combustion IC (2.930.9010)
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Image credit: Metrohm.
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Image credit: Metrohm.
Results
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Image credit: Metrohm.
|
|
1 Fluorine [mg/kg]
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2 Chlorine [mg/kg]
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3 Unknown
|
4 Sulfur
|
|
Coal
|
87.9
|
55.8
|
-
|
n.q.
|
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This information has been sourced, reviewed and adapted from materials provided by Metrohm.
For more information on this source, please visit Metrohm.