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Waclaw Dziurzynski

Waclaw Dziurzynski
The Strata Mechanics Research Institute Polish Academy of Sciences. Poland Cracow · Institute

About

26
Publications
1,079
Reads
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120
Citations
Citations since 2017
8 Research Items
86 Citations
201720182019202020212022202305101520
201720182019202020212022202305101520
201720182019202020212022202305101520
201720182019202020212022202305101520
Introduction
Skills and Expertise

Publications

Publications (26)
Article
Full-text available
In coal mines that are exploiting methane-saturated seams, high-level emission of methane is often the basic limitation for modern and high-efficiency longwall complexes. This paper presents selected observations and tests carried out in the Cw-4 longwall in seam 364/2 of the Budryk mine, which belongs to JSW SA. To observe the methane levels in th...
Preprint
The data from the extended system was recorded on-going basis in the archives of the monitoring system, and the multipoint system was directly stored in the methane-anemometers, which allows one to perform a comparative analysis of the obtained records from many methane detectors. An important element of the analyses was the simultaneous registrati...
Article
Full-text available
This paper presents a relatively simple method to analyze potential methane hazard and preventive methods based on a computer simulation of the airflow and methane emission on the longwall face and in the goaf. The presented approach considers the operation of a longwall shearer and conveyers and their possible impacts on both direct emissions of m...
Article
For many years, the legal regulations governing radiation protection were primarily concerned with artificial radioactivity, omitting in practice the hazards associated with the occurrence of natural radioactivity in non-nuclear industry. Meanwhile, materials with enhanced concentration of natural isotopes can pose serious radiation risks. A specta...
Chapter
Abandonment of underground mines of a complex multi-level structure is usually done in a stepwise way. At each stage, the performance of the ventilation system must be adjusted to current structure of workings and the liquidation of related activities. The ventilation system must not only provide relevant working conditions of the liquidation but a...
Article
Full-text available
This paper describes the concept of controlling the advancement speed of the shearer, the objective of which is to eliminate switching the devices off to the devices in the longwall and in the adjacent galleries. This is connected with the threshold limit value of 2% for the methane concentration in the air stream flowing out from the longwall head...
Article
Full-text available
This paper presents a method for determining the sensitivity of the main air flow directions in ventilation subnetworks to changes in aerodynamic resistance and air density in mine workings. The authors have developed formulae for determining the sensitivity of the main subnetwork air flows by establishing the degree of dependency of the air volume...
Preprint
This paper presents a methodology for determining the sensitivity of the main air flow directions in ventilation subnetworks to changes of aerodynamic resistance and of air density in mine workings. Formulae for determination of the sensitivity of the main subnetwork air flows by establishing the degree of dependency of the air volume stream in a g...
Article
Full-text available
Forecasting a ventilation process is based on two factors: using a validated software (Dziurzyński et al., 2011; Pritchard, 2010) and a properly prepared database encompassing the parameters describing the flow of air and gases, compatible with the adopted mathematical model of the VentGraph software (Dziurzyński, 2002). With a body of measurement...
Article
Full-text available
In the paper the results of investigations aimed at further identification of the phenomena occurring in abandoned workings and connected with the flow of air-gas (methane, carbon dioxide, nitrogen, oxygen and carbon oxidation products) mixture with taking into consideration the impact of supplied mineral substances on the processes of self-heating...
Article
Full-text available
Designing exploitation in seams in surroundings of strongly methane bearing seam assumes particular importance in conditions of the growing concentration of output. While planning exploitation, calculations results of predictions of methane emission to longwalls form a basis for selection of a mode of ventilation scope of utilized prevention, inclu...
Article
Outbursts of methane and rocks are, similarly to rock bursts, the biggest hazards in deep mines and are equally difficult to predict. The violent process of the outburst itself, along with the scale and range of hazards following the rapid discharge of gas and rocks, requires solutions which would enable quick and unambiguous detection of the hazar...
Article
Full-text available
The article presents the measurement results of a time-variable volumetric air flow rate flowing inside the inlet duct of a main ventilation fan. In situ research was carried out using the multi-spot flow velocity field measurement system in mine workings (SWPPP), which provides wireless measuring data transmission from anemometric sensors to the r...
Article
This paper presents a mathematical model for sealing mine goaf. The model has been applied using VentZroby software for determining air distribution patterns in goaf varying over time as the goaf are gradually filled. The developed model is based on the balance of the volume of a mixture supplied and contained in the body formed in the goaf. The ge...
Article
The transient nature of air parameters in mine headings is a result of natural and technological disturbances in mine ventilation conditions; these disturbances are usually directly caused by changes in heading geometry, the operational status of fans, and gas emissions. The more significant transient states are those caused by disturbances resulti...
Article
It is accepted that the methods of computer simulation of phenomena that are used to Solve the issue of the regulation of flow in it network of demethanisation pipelines do contribute as an effective tool for the further development of knowledge and to help reduce the methane hazard in coal mines. Of practical interest and usefulness is the further...
Article
This article outlines the results of a computer simulation reproducing the transport of a mixture of air and methane following the outburst on 25 November, 2005 in transport gallery D-6, bed 409/4, at the 'Zofiówka' hard coal mine. Based on a mathematical model, numerical method and boundary conditions from the disturbance caused by the outburst, t...
Article
A method of a continuous measurement of an unsteady distribution of velocity in a cross section of a mine working has been presented. The measurement was made with a computer controlled portable data acquisition system with a fast 24-channel data logger capable of simultaneous sampling in all channels and in-home designed and manufactured Pitot-Pra...
Article
Full-text available
The present article sets forward the results of tests that made it possible to validate the mathematical model used in the VENTGRAPH ventilation engineer programmes. The case considered relates to the introduction of new headings to the ventilation network of of a mine. The utilisation of computer programmes in practice is justified by the necessit...
Conference Paper
Full-text available
The new method of spontaneous gob fire prevention in underground coalmine was described in the paper. It is the fly ash suspension together with carbon dioxide application. The basic aim of the application was to limit fire hazard (spontaneous heating processes elimination) by decreasing the airflow through the gob (suspensions) and inertization of...
Article
This article contains a presentation of a mathematical model of the mine fire, which takes into account the consumption of oxygen in the coal combustion process. The adopted mathematical model of the mine fire, given in cylindrical coordinates, enables calculation of the temperature of the mine fire in the goaf, taking into consideration the transp...
Article
Full-text available
In recent years attempts have been made to fight open and intensive mine fires by the use of special extinguishers, which are able to produce great volumes of inert gases directed into the fire zone. These extinguishers are derived from turbo-jet engines used in aircrafts and adopted for operations in mine conditions. The purpose of this paper is t...
Article
Full-text available
An increasing concentration of coal production, especially in the circumstances of intensive methane inflow makes the coal mine managing staff apply new techniques of safe mining. It paves also the way for scientists to develop new directions of investigations and implementation of state-of-the-art technical solutions. Simultaneously, it could be n...
Article
A mathematical model of a fire under conditions of methane inflow has been presented. Applying mathematical terms for the description of non-stationary phenomena which take place during a fire, the potential sources of methane has been defined as mass inflow to the air flowing through the ventilation network. Considering the possibility of methane...
Article
Examples of a non steady state caused by the occurrence of an additional quantity of gas in a mine ventilation network, are presented. Such phenomena take place during an underground fire, methane emission into mine workings or in an outburst of carbon dioxide for example. An equation describing the air flow in a ventilation network was derived and...
Article
The present article sets forward the results of field tests that made it possible to validate the mathematical model used in the VENTGRAPH ventilation engineer programmes. The case considered relates to the introduction of a new heading to the ventilation network of the mine. The utilisation of computer programmes in practice is justified by the ne...

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