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Innovation of the bucket elevator
Hála, Ondřej ; Frýza, Josef (referee) ; Brandejs, Jan (advisor)
The bachelor thesis deals with the innovation of the bucket elevator. The thesis is focused on design modification of the elevator in the areas where the transported material is settled. Settled material causes decay and subsequent contamination of the fresh material. Main purpose of this paper is to propose design solution to improve cleaning of the feed boot of the bucket elevator. The next innovation deals with the modification of the marking system and efficient series of the elevators.
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Dry Ice Blasting and Industrial Practice
Konečná, Eva ; Máša, Vítězslav (referee) ; Kuba, Pavel (advisor)
This thesis deals with the subject of dry ice blasting and its industrial practice. The key charakteristics of dry ice are described as well as an overview of dry ice blasting practical usage in various industries. Main part of this thesis focuses on a study of dry ice degradation, through a series of experiments and observations.
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Construction and production of wiping element of open source FDM printer
Chrást, Jan ; Slaný, Martin (referee) ; Zemčík, Oskar (advisor)
The aim of thisworkis to design and manufacture a cleaning element foropen source FDM printer. The workincludestheoreticalanalysis of theissue of cleaningnozzle of FDM printer and the design solution in the form of cleaner element. Model of body of cleaning element isdesigned in program Autodesk Inventor and made on the open source printerowned by Ing. Zemčík. Subsequently, the solutionistested and cleaningproperties are comparated.
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Interaction of Lanthanide trichlorides with the construction materials of a purification apparatus
Novotný, Radoslav ; Zmrzlý, Martin (referee) ; Richtera, Lukáš (advisor)
Lanthanide halides LnX3 are the base material for preparation a different compounds, but also the pure metals. Our faculty is used for the syntesis organometallic catalyst. This compounds are very sensitive to the presence of moisture and oxygen. Lanthanide halides are commercially available in anhydrous or hydrated form. This thesis is devided eight chapters and deals with matherial of the apparatus, which is designed to sublimation of anhydrous lanthanide halides. Initial chapters described the properties and preparation this substances. Following are on the sublimation and corrosion materials. In the last chapter is the skeleton sketch, layout and a availability parts of construction. The aim of this work was to create theoretical basis of construction aparatus and commissioning.
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The past and the present of purification of chimneys and flues
HÁLA, Pavel
This work endeavours to map the development and actual level of chimney and flue cleaning in the Czech Republic including the appraisal of statutory instruments during the period from 1751 to 2015. The aim is to compare the techniques and methods of chimney cleaning used in the past as well as in the present and their effect on health and enviromental protection and safety. The work is divided into two parts. The theoretical one introduces historical changes of rules defining cleaning of chimneys and combustion tracks in Czech lands in the past. The present technologies are being described as well as conditions of fire safety for functioning of chimneys and flues. This part is also following up checking and revisions of combustion tracks, measuring efficiency of combustion, burning of chimneys, frequency of checking and cleaning of chimneys etc. The following sections pay attention to documents dealing with classification of types of chimneys, technical and safety standards for safe working of combustion tracks and the impact of techniques of cleaning on health and enviromental protection and safety. In the second part of this work the results extracted from the questionnaire survey are presented. The results are devided into three chapters according to the three main areas the survey was focused on. The first chapter compares statutory instruments, prevention, checking and methods of chimney clearing and their effect on health, safety and environment. The second chapter pays attention to the same topics but in present days. In the last chapter the research is based on statistic numbers of fires in the particular periods. For the research the methods of analysis and appraisal of technical books, legal standards and information from internet sources were used. The qualitative research was evaluated by methods of comparison and analysis. By the means of analysis and appraisal of information from relevant literature the methods of cleaning of chimneys in particular periods of existence of chimney sweeping profession were compared. The main research was based on the evaluation of the answers to eleven questions concerning the issues of cleaning chimneys and the impact on health and enviromental protection and safety. The questions were presented to chimney sweepers in the form of an electronic questionnaire which was sent to two hundred persons from the whole area of the Czech Republic by e-mail. From the mentioned number 26 respondents sent their answers back. The results of the questionnaire survey were evaluated by the method of comparison individual opinions of the respondents were compared and after that the summary answers about various aspects related to chimney sweeping profession were made. The aim of this work was to compare the development of methods of chimney cleaning during various periods of existence of chimney sweeping profession and also to appraise the situation in the present days, including statutory instruments. The results of the research should have answered two main questions the first one should have assessed the effect of methods of chimney cleaning used in the present on health and enviromental protection and safety in comparison with the methods used in the past. The answer to the second one should have appraised legislation which deals with issues of chimney cleaning from the point of its comprehensiveness. The research shows that the techniques and methods of cleaning chimneys and flues used in the present guarantee better and higher health and enviromental protection and safety than the methods used in the past. However it is necessary to mention the fact that the number of fires which arise because of the chimney activity is still relatively high. According to the legislation the results show that the actual laws and regulations are sufficient, however in some aspects, especially in education system and professional preparation of chimney sweepers, we can find substantial defects.
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