A new approach for processing and agglomeration of low-rank coals for material usage
The material usage of low-rank coal offers a high potential regarding the increasing in added value. The production of coke from a wide span of low-rank coals may be a promising perspective. Since low-rank coals do not exhibit any baking properties they n
- PDF / 527,354 Bytes
- 6 Pages / 439.37 x 666.142 pts Page_size
- 101 Downloads / 174 Views
ion Today low-rank coals like brown coal, lignite and sub-bituminous coals are mainly used for power and heat production. Considering the opening of new resources, the material utilisation of low-rank coals will be intensified. Besides extraction of coal ingredients like montan wax (Fehse et al. 2013, Fehse et al. 2014a) or gasification of coal the pyrolysis of coal enables the production of new materials for various applications (Schmalfeld 2008). The three main products of coal pyrolysis are coke, tar and oil as well as gas. Since so called low-rank coals exhibit higher volatile matter they offer comparatively high amounts of tar/oil and gas. Gases, tars and oils may be processed to chemical raw materials. The quality of the coke is highly dominated by the operation parameters of the pyrolysis as well as the previous steps of refinement and the raw material itself. Thus every coal needs specially matched processing and pyrolysis parameters. In contrast to so called coking coals, the low-rank coals do not exhibit any baking capacity. Thus if lump coke shall be produced from low-rank coals, e. g. brown coal this is only possible by the gentle pyrolysis process up to 1000 °C of high quality briquettes. The processing of lump coke from Lusatian brown coal was developed by Erich Rammler and Georg Bilkenroth in 1952 (DD4630, 1952). This coke was a milestone in brown coal conversion and could substitute the coke of bituminous coals in several applications. But if the raw material base is extended to coals of other deposits or ranks, further developments on the oven and the operation as well as the pre- and posttreatment are needed.
Ó Springer International Publishing Switzerland 2016 V. Litvinenko (ed.), XVIII International Coal Preparation Congress, DOI 10.1007/978-3-319-40943-6_147
941
942
F. Fehse et al.
For this reason the briquetting and coking behaviour of selected low-rank coals was investigated first in laboratory scale in fundamental investigations to analyse the potential of lump coke production. 2 Material and Methods 2.1 Materials For the following investigations a Lusatian brown coal from Germany (LBC) with a moisture content of 56.2 % and an ash content of 2.98 %(d) as well as an Indonesian brown coal (IBC) with a moisture content of 58.7 % and an ash content of 3.55 %(d) were used.
Drying Laboratory dryer
Fine comminution Impact mill
Fine comminution Modified flat die press
Granulation Intensive Mixer
Drying Laboratory dryer
Granule
Conditioning Intensive Mixer
Fine comminution and Granulation Modified flat die press
Drying Laboratory dryer
Granule
Briquetting Hydraulic stamp press
Briquette
Pyrolysis Laboratory retort
Lump coke
Approach 3 Approach 2
Pre-comminuted brown coal
Approach 1
2.2 Processing, agglomeration and coking of the coal To investigate the influence of coal processing three different approaches were used (figure 1). For the investigations the coal was pre-comminuted in a hammer mill to ∆d ≈ 6/0 mm.
Figure 1: Approaches for coal processing for lump coke production f
Data Loading...
