Wyniki wyszukiwania - BazEkon

1

Analysis of The Scale of Methane Hazard in Polish Hard Coal Mines

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Tutak M.

Multidisciplinary Aspects of Production Engineering

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2018

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1

801-807

In the majority of Polish mines, the exploitation of hard coal is accompanied by the release of considerable amounts of methane. Being flammable and explosive, methane may form an explosive mixture with air once it appears in mine workings. For this reason, the methane hazard is recognised as one of the ventilation risks in the mining industry. This process leads to the formation of air and methane mixture, whose considerable amounts permeate into the atmosphere and the natural environment. This phenomenon is extremely unfavourable because methane is, besides carbon dioxide, yet another gas that exacerbates the greenhouse effect. For this reason, it is increasingly more common to equip mines with methane collection systems in the process of demethylation. These play a vital role for both the natural environment and the safety of work in mines. A reduction of the methane content in headings increases the safety of the working crew and enhances the effectiveness of mining production. The article presents an analysis of the methane-related hazard based on methane emissions during mining exploitation. The analysis was based on the data concerning the amount of methane emitted into the atmosphere and collected by methane extraction systems from 16 coal mines. It led to identification of homogenous mines with similar values of the absolute methane-bearing capacity and ventilation methane-bearing capacity as well as with similar amounts of methane collected by methane extraction systems. The analysis was performed using the non-hierarchical k-average method, which belongs to the group of algorithms for analysing clusters. As a result, the mines were divided into the assumed number of groups. The results obtained made it possible to determine a group of mines in which, in the Author's opinion, similar systems can be applied for controlling and reducing the methane hazard. These results also open up numerous possibilities for undertaking joint business ventures by the mines in terms of using the collected methane and implementing preventive measures. (original abstract)

2

Environmental Efficiency of Industrial Symbiosis - LCA Case Study for Gypsum Exchange

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Marcinkowski A.

Multidisciplinary Aspects of Production Engineering

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2018

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1

793-800

A review of the available literature concerning environmental impact assessment for industrial symbiosis has been carried out. The authors have recommended the use of life cycle assessment method for this purpose. It was stated that so far few studies presenting LCA results of industrial symbiosis have been published. Among the factors which contribute to the success of symbiotic exchange, the close location of collaborating companies has been often mentioned. This paper presents LCA results concerning the environmental impact of symbiotic gypsum transmission. Concepts of relative distance and critical distance for the case of industrial symbiosis were proposed and defined. Significant difference between critical distance obtained for particular endpoints were observed (3.5-564 km). Application of Life Cycle Sustainability Triangle enabled the estimation of critical distance taking into account various impact categories. A sensitivity analysis indicated the relationship between critical distance and the means of transport which reflected the effect of scale. The critical distance determined for heavy trucks was 3.2 - 3.9 times longer than in case of lighter vehicles. (original abstract)

3

Zakłady Przemysłu Gipsowego "Dolina Nidy" SA : Sylwetka firmy

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Komuda Ł.

Boss-Gospodarka

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2001

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nr 51-52

23

ZPG "Dolina Nidy" są największym producentem gipsu w Polsce. Kopalnia wydobywa 59 procent gipsu naturalnego i dostarcza surowiec liderom rynku chemii budowlanej i płyt gipsowo-kartonowych.

4

Pressure measurement as a tool to identify moisture transport mechanisms in convective drying of non-shrinking materia

100%

Adamska A., Pakowski Z.

Acta Innovations

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2018

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nr 27

46-52

The drying process is one of the most important stages in the production of building materials. The choice of the drying method affects the chemical and physical properties of the final product. The aim of this research is to measure and analyze the dynamic changes of internal pressure in non-shrinking, porous material during convective drying. In this work the problem will be discussed with special attention to the behavior of rewetted plaster. A commercial gypsum of company PIOTROWICE II (Alpol brand), typically used in construction and decorative plastering was applied. Gypsum was mixed with water in recommended proportion of 0.6 water/gypsum and drying experiments were performed at 50°C. The changes in sample overall mass as well as pressure and material temperature on the midpoint of sample axis were monitored. On the basis of the obtained experimental data of axial pressure, it is possible to perform a more detailed analysis of mass and heat transfer mechanisms than based on the drying kinetics alone. The pressure trends in the sample allow one to determine the moment of transition from the first to the second drying period, without the need to determine the kinetics of drying. The element of novelty consists of using a direct internal pressure measurement to provide information on the variation of the actual drying rate and mass transfer mechanisms.(original abstract)

5

Rynek tynków gipsowych

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Boss-Gospodarka

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2002

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nr 6

9

W roku 2001 rynek tynków gipsowych w Polsce osiągnął wielkość ponad 244 tys. ton i wartość przeszło 171 mln zł. Oznacza to wzrost wolumenu w porównaniu z rokiem 2000 o 10 procent jak również wzrost wartości o 20 procent

6

Rynek gipsu i materiałów gipsowych

80%

Komuda Ł.

Boss-Gospodarka

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2001

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nr 51-52

I-XII

Chociaż Polska jest krajem bogatym w złoża gipsu, jego wydobycie w nowych wyrobiskach ograniczone jest względami ekologicznymi. Normy ochrony środowiska mogą zmusić elektrownie i elektrociepłownie do odsiarczania spalin, co zwiększy produkcję gipsu syntetycznego. Ograniczona podaż gipsu jest jednak mniejszym zmartwieniem producentów, niż osłabienie koniunktury w budownictwie.

7

Ładny gips... czyli o jego polskiej karierze

80%

Komuda Ł.

Boss-Gospodarka

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2001

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nr 34

5-9

Gips jako surowiec do produkcji różnorodnych wyrobów oraz dodatek wzbogacający do wielu substancji (m.in. cementu) w ostatnich latach zyskał ogromną popularność. Jego wykorzystanie rośnie, ale coraz większy popyt spotyka się z mało elastyczną podażą. Dlatego są małe szanse na to, by rodzimy przemysł artykułów z tego surowca rozwinął się do rozmiarów porównywalnych np. z przemysłem wyrobów gipsowych w Niemczech.