Mibrag

MIBRAG mines brown coal in coal fields near Leipzig in central Germany. The company owns and operates two open coal mines, Profen and Vereinigtne Schleenhain, with the total annual output exceeding 20 million tons of coal. The documented reserves amount to roughly 500 million tonnes of coal, with an option to further increase the extraction activity in a significant manner given the industrial reserves at an estimated 2 billion tonnes. Since 2014, EP Coal trading a.s. has been a supplier of coal meeting the demand of electric power plants falling within the EPH Holding (United Energy Komořany and Elektrárna Opatovice) and other energy capacities within the Czech Republic.

Quality parameters of the coal (grain size 0-50 mm):

PARAMETER DIAMETER 
Calorific value - Q ir [MJ/kg] 9 10 11
Combustion heat - Q s daf [MJ/kg] 27 28 29
Water content -W r t [% wt.] 49 52 55
Ash content A d[% wt.] 12 16 20
Sulphur content - Sd [% wt.] 3,1 3,6 4,2
Volatile combustible V daf [% wt.] 55 60 70
Carbon content Cdaffix [%wt.] 30 40 45
Emission factor [tco2/TJ] 105 105 106

Elemental composition of the combustible: 

PARAMETER DIAMETER 
Carbon Cdaf [% wt.] 67 71 76
Hydrogen Hdaf [%wt.] 5 6 7,5
Nitrogen Ndaf [% wt.] 0,2 0,6 0,8
Oxygen Odaf [% wt.] 12 17,4 22,5
Sulphur Sdaf [% wt.] 3,5 4,7 5,3

Ash fusibility in an oxidising atmosphere 

PARAMETER DIAMETER 
Deformation temperature DT [°C] 1180 1180 1310
Softening temperature ST [°C] 1200 1200 1350
Melting temperature HT [°C] 1200 1200 1370
Flow temperature FT [°C] 1200 1200 1400

Sulphur species 

PARAMETER DIAMETER 
Pyritic Sdp [% wt.] 0,2 0,4 0,8
Organic Sdo [%wt.] 2,8 3 3,1
Sulphate Sdso4 [% wt.] 0,05 0,1 0,17

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