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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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Electrostatic precipitator for household wood firing boiler
Preisler, Lukáš ; Skála, Zdeněk (referee) ; Brázdil, Marian (advisor)
This diploma thesis aims on the development of an experimental electrostatic precipitator for household wood firing boiler. First, a literature review was conducted, aiming on the description of the precipitator using physical relations and, on its basis, a numerical model was created. By applying the numerical model, the precipitator configuration was designed as well as the engineering design of the whole system. The chosen configuration was validated by measurement using the corona discharge starting at voltage of 6,5 kV. By applying modifications, the electrostatic precipitator was built and tested during a running boiler. Due to flue gas condensation and load, corona discharge did not initiate, and the parameters were not validated. Modifications in the construction design were suggested leading to launch the electrostatic precipitator. The main requirement is a surface finishing of wire hinging components.
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A test setup for thermal cycling of thermoelectric modules
Preisler, Lukáš ; Kudela, Libor (referee) ; Brázdil, Marian (advisor)
The present work is focused on thermoelectric modules and testing modes. Failures of thermoelectric modules occur due to the cyclic thermal stress in real applications and their power parameters decrease. Hence an experimental study of thermoelectric modules was executed, which measured parameters of thermoelectric modules and thermal cycling testing methods. In the practical part of this document, the thermal cycling conditions of thermoelectric modules were set-based on the previously stated study. A bipolar-pulse load in range +3,0 V and 3,0 V was proposed alternating after 90 seconds. For comparison of the modules among producers 200 cycles will be made. According to the cycling conditions, construction adjustments of current laboratory testing platform are proposed. The current platform is currently set to measure parameters of thermoelectric modules and is not for cycling load testing.
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Electrostatic precipitator for household wood firing boiler
Preisler, Lukáš ; Skála, Zdeněk (referee) ; Brázdil, Marian (advisor)
This diploma thesis aims on the development of an experimental electrostatic precipitator for household wood firing boiler. First, a literature review was conducted, aiming on the description of the precipitator using physical relations and, on its basis, a numerical model was created. By applying the numerical model, the precipitator configuration was designed as well as the engineering design of the whole system. The chosen configuration was validated by measurement using the corona discharge starting at voltage of 6,5 kV. By applying modifications, the electrostatic precipitator was built and tested during a running boiler. Due to flue gas condensation and load, corona discharge did not initiate, and the parameters were not validated. Modifications in the construction design were suggested leading to launch the electrostatic precipitator. The main requirement is a surface finishing of wire hinging components.
|
|
|
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.
|
|
|
A test setup for thermal cycling of thermoelectric modules
Preisler, Lukáš ; Kudela, Libor (referee) ; Brázdil, Marian (advisor)
The present work is focused on thermoelectric modules and testing modes. Failures of thermoelectric modules occur due to the cyclic thermal stress in real applications and their power parameters decrease. Hence an experimental study of thermoelectric modules was executed, which measured parameters of thermoelectric modules and thermal cycling testing methods. In the practical part of this document, the thermal cycling conditions of thermoelectric modules were set-based on the previously stated study. A bipolar-pulse load in range +3,0 V and 3,0 V was proposed alternating after 90 seconds. For comparison of the modules among producers 200 cycles will be made. According to the cycling conditions, construction adjustments of current laboratory testing platform are proposed. The current platform is currently set to measure parameters of thermoelectric modules and is not for cycling load testing.
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