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Effect of ESP on distribution and chemical composition of particles from biomass combustion
Preisler, Lukáš ; Köbölová, Klaudie (referee) ; Adamec, Vladimír (advisor)
Biomass combustion causes a significant number of particles that, released into the atmosphere, negatively affect human health. Knowledge of the size and composition of the particles is essential for possible flue gas separation by electrostatic precipitation technology. This technology is developed and used in large power plants, but the electrostatic precipitation in domestic boilers is rare. This work describes the methods of fine particle formation and their size distribution and composition. Measurement methods of chemical composition and the size distribution are provided. According to a review, the effect of electrostatic precipitator on size distribution and chemical composition is discussed. In the experimental part, fine particles were sampled from the flue gas of a domestic wood pellet boiler containing an experimental electrostatic precipitator. Due to operational reasons, the electrostatic precipitator did not run during sampling. Flue gas condensed on the inner surface of the flue. The particles were sampled on filters at the beginning and the end of the flue. The filter was analyzed on an electron microscope.
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Prevention of Major Chemical Accidents
Koutský, Tomáš ; Adamec, Vladimír (referee) ; Mika, Otakar Jiří (advisor)
This bachelor thesis handles prevention of major chemical accidents. There are introduced basic terms, case studies, legislative overview and legislative defined duties, historical and present status of prevention of major chemical accidents in the Czech Republic. There is also chemical accident prevention model case elaborated. At the conclusion, concept of chemical safety increase and concept of scale for chemical accident classification are introduced.
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In Vitro Study of the Effect of Particle Characteristics and Flow Rate on Regional Deposition in Human Airways
Bělka, Miloslav ; Adamec, Vladimír (referee) ; Farkas, Árpád (referee) ; Jedelský, Jan (advisor)
Dlouhodobé vdechování částic může přispívat ke vzniku nebo zhoršení nejrůznějších plicních onemocnění. Na druhou stranu, vdechování léčiv je často používanou metodou podávání léků proti astmatu a jiným nemocem dýchacího ústrojí. V obou případech je důležité dobře porozumět mechanismům, na jejichž základě funguje pohyb částic a jejich usazování v dýchacích cestách. Cílem této disertační práce bylo získat nová experimentální data depozice částic a analyzovat vliv tvaru částic a průtoku vzduchu na depozici. Byla studována depozice porézních a vláknitých částic v realistickém modelu dýchacích cest. Porézní částice byly vyrobeny různými metodami, např. sprejovým sušením nebo metodou krystalizace. Takto vyrobené částice byly použity při depozičních experimentech. Detekce částic byla provedena pomocí UV/VIS spektrofotometrie. Vláknitý aerosol byl vytvořen rozdrcením skelné vaty. Takto vzniklé vláknité částice byly několikrát prosety přes řadu sít a dále roztříděny podle délky pomocí klasifikátoru pracujícím na principu dielektroforézy. Následná depozice byla vyhodnocena použitím mikroskopie s fázovým kontrastem. Ke zrychlení analýzy byl vyvinut program, který dokáže na základě analýzy obrazu najít a spočítat vlákna. Výsledky experimentu byly použity k určení depozičních charakteristik. S jejich pomocí pak byl kvantifikován vliv tvaru částic a průtoku na míru usazování. Depoziční účinnost částic rostla v závislosti na Stokesově čísle, což poukazuje na vliv setrvačnosti při usazování částic. Bylo prokázáno, že depoziční účinnost porézních částic je podobná té u částic kulových při stejném Stokesově čísle. Vláknité částice se usazovali méně efektivně v porovnání s kulovými částicemi majícími stejné Stokesovo číslo. Jelikož byly okrajové podmínky dostatečně popsány a model plic je k dispozici i v digitální podobě, je možné data použít k validaci výsledků numerických simulací.
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Risk management of operation in transportation and haulage company
Sedláček, Martin ; Kalenda, Lukáš (referee) ; Adamec, Vladimír (advisor)
An issue of operational risk management is in modern times an important topic to resolve. Modern fast time, which brings a number of changes may affect the occurrence of risks that may have impact on operating activities of a company. This fact, however, does not depend on the company characteristics like: size, business sector and other factors. Risks are ubiquitous in a business because a business is a very risky activity. Every company should therefore have a risk management system or a procedure to deal with them. This thesis focuses on an analysis of issues of an operational risk management, the current situation in the transport sector and the risks arising from specifics of the transportation sector. Further analysis of risk in specific transport-forwarding company is based on previously conducted analysis. The output of this work is to propose countermeasures to prevent the effects of identified risks or to propose a general procedure for the operational risk management of companies operating in the transport sector.
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Exposure to Nanoparticles in Means of Transport
Maslonková, Ivana ; Kadlec, Radek (referee) ; Adamec, Vladimír (advisor)
The diploma thesis deals with the exposure of nanoparticles in means of transport. The diploma thesis provides an overview of the current state of exposure to nanoparticles in vehicles that people use every day travelling to work. Moreover, the work describes the health risks that can be caused by these particles and have an adverse effect on human health. The work processed data (particle number concentration, particle size and LDSA) which monitored the exposure of nanoparticles in the tram of public transport in the city of Brno and the extent of pollution by nanoparticles at stops.
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Hazardous Chemical Substances and Preparations
Lacina, Petr ; Adamec, Vladimír (referee) ; Mika, Otakar Jiří (advisor)
The aim of this bachelor‘s thesis is to present a brief and current summary of hazardous chemical substances based on simultaneous laws in force. It introduces basic information and data on industrial hazardous chemical substances and basic characteristics of chemical warfare agents. This thesis also deals with documentation related to solutions for emergency events in connection with hazardous chemical agent escape – type plans, methodical sheets. The work results in a proposal for another methodical sheet focused on interventions of concrete hazardous chemical substance escape, i.e. hydrogen chloride. In this way the proposal can extend the methodical sheets for chlorine and ammonia currently in use. This thesis also presents list of toxic chemical, industrial and warfare substances for working up another methodical sheets.
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Nanosafety and the Current Trends in the Risk Assessment of Nanoparticles
Valovič, Stela ; Poláčik, Ján (referee) ; Adamec, Vladimír (advisor)
This diploma thesis deals with the current state of nanosafety. The aim of this paper was to review and critically analyze approaches to facilitate the risk assassment of nanomaterials. In the first part it provides an overview of the most important methods and software tools that are used in this field. Methods were analyzed against a set of relevant criteria. Criteria include consideration of exposure, life cycle and physicochemical properties, transparency, applicability and the field of application. Different criteria were chosen for the software tools. Based on results, a new approach was suggested. The approach takes the form of a diagram based on questions. The purpose of the suggested approach is to recommend the most relevant method, tool or their combination to assess the safety of a nanomaterial depending on known characteristics. The approach was also implemented in a software tool.
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