Brown Coal Bulletin, 2009 (vol. 49), issue 2

Ways and means of drainage with electropneumatic and liquid seal drains and examples of application at Most-Ležáky site

Ing. Ondřej Mrvík, MEng. Sébastien Bomont

Zpravodaj Hnědé uhlí 2009, 49(2)

Natural or artificial slopes are very often affected by problems with instability. Such problems can lead to endanger of existing properties, excavations or structures under construction and to increase in expenses. The prime trigger for land slipping is a high groundwater level. The method of dewatering is important. Some traditional drainage techniques are proven methods. However, two innovative deep drainage systems, the Siphon and the Electropneumatic drains, could have certain advantages. During the remediation works of the former brown coal open mine "Most-Lezaky", several signs of instability at certain parts of the treated slopes were observed....

Monitoring underground water level in Radovesice dump

Ing. Lukáš Žižka, Ing. Josef Halíř, Ph.D.

Zpravodaj Hnědé uhlí 2009, 49(2)

The work submitted summarizes basic information about geology, hydrology and hydro-geology of the Radovesice dump. In the Radovesice dump area there are eleven hydro-geological monitoring drills situated where the levels of underground water are monitored in regular monthly intervals. The hydro-geological drills are situated in the aquiferous parts of the dump and on its base. The measured and assessed values serve to extendi the knowledge about the dump regime and to create complex insight in the hydro-geological situation of the dump.

Mine waters preparation at ÚDV Svatava

Ing. Silvie Heviánková, Ph.D., Ing. Iva Bestová, Ph.D., Ing. Miroslav Zechner

Zpravodaj Hnědé uhlí 2009, 49(2)

After ending of the mine water pumping from the open pit Medard, which is on the present used for hydrologic reclamation, the mine water from mine Jiří and newly from open pit Jiří is transported to the Water Preparing Plant Svatava. The water is specifically pumped from the pumping station Lomnice and dumping station J3 and this water is very problematic due to its composition. The aim of the experimental works was on the basis of the inlet mine waters analyses, transported to the Water Preparing Plant to elaborate comprehensive solution for the mine water treatment.

Disposal of the old mine - Jacobi I drift in Světec by a combined method using consolidated, blown and washed fill

Ing. Jiří Varady, Ing. Petr Čmejrek, Ph.D.

Zpravodaj Hnědé uhlí 2009, 49(2)

The article deals with the reasons and the disposal manner of a specific old mine - Jacobi I drift. The disposal manners of old mines are described, developed and known in quite a detail. The article describes the combination of several manners used and reasons why that combination was used. In this case it is the combination of consolidated, air-blown and washed fill. Maximum achievable safety of the disposed construction and avoiding the threat of sinks developed in places with frequent occurence of people - allotments etc. are the main reasons. The disposed part of the drift was outside of the coal bed development. Disposal of its continuation in...

The evaluation of lignite deposit in Bzenec based on a digital model

doc. RNDr. František Staněk, Ph.D., Ing. Jan Jelínek, Ph.D., Ing. Kerstin Hoňková, Ph.D.

Zpravodaj Hnědé uhlí 2009, 49(2)

In this contribution methodological procedures and results of digital modelling and assessing the lignite deposit in the Bzenec area of the Czech part of the Vienna Basin (the South Moravian Lignite Coalfield) are presented. Deposit database includes data from almost 300 drills. Except of primary deposit data, the database contains data on identically re-assessed economical thicknesses of the coal seam and coal benches. The primary deposit model is a so-called geological model, which describes the structural character of the deposit and defines the spatial positions of the coal seams. On the basis of the geological model so-called economical models,...

First phase of addressing grant project No. 105/09/1675 "Geological, pedological and biological research of various types of areas after brown coal mining and optimization of reclamation approaches to landscape regeneration"

RNDr. Michal Řehoř, Ph.D., doc. Mgr. Miroslav Šálek, Ph.D., Ing. Markéta Hendrychová

Zpravodaj Hnědé uhlí 2009, 49(2)

Areas after open pit brown coal mining in the North Bohemian Brown Coal Basin reach large dimensions and so they are a remarkable phenomenon in the landscape. Nowadays much of them have already been reclaimed. A technical reclamation creating of an application of fertilizable rocks is most often or exclusively carried out, followed by a biological reclamation, forestal and agricultural. Return to the more natural state is the matter of near tens of years for greater part of the territory. However, it still is not sure which kind of land-management is the best for non-productive functions of the landscape. The objective of the project is to evaluate...

Mathematical models of pulverised coal particles burnout in the drop tube

Ing. Radim Paluska, Ing. Jiří Horák, Ph.D., Ing. Michal Stáňa, Ph.D., Ing. Marian Bojko, Ph.D.

Zpravodaj Hnědé uhlí 2009, 49(2)

Thermokinetic properties of solid fuels, especially coals, can be experimentally determined in experimental facility called drop tube. Obtained results from tests describe behaviour of fuel particles during burn-out. Points at issue of all mathematical models are in definition of input parameters of fuel. There were worked-out two models for one specific fuel in programs FLUENT and ANSYS. In this paper are compared and discussed results of these models. Experimentally observed parameters of fuel from droptube will serve to optimalization and adjustment of input constants of models which characterizing given fuel.