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Master's Thesis
Author of thesis: Bc. Antonín Lupínek
Acad. year: 2025/2026
Supervisor: Mgr. Ing. Marek Vondra, Ph.D.
Reviewer: Ing. Jan Kalina
Vacuum evaporation allows for evaporation at lower temperatures than those at atmospheric pressure. This makes it a suitable method for treating wastewater with a high concentration of dissolved substances. This thesis examines a forced-circulation vacuum evaporator, including an analysis of its initial state, commissioning, and experimental verification of its operating parameters. Prior to starting work, the equipment was in an incomplete experimental setup state with unfinished piping connections, a nonfunctional vacuum system, and no measurement or control system. The commissioning process included creating a P&ID diagram, completing the piping routes, connecting an electric boiler as a heat source, commissioning the vacuum system, and integrating the IO-Link measurement system with the Delphin control system. Experimental verification was performed using a design of experiments (DOE) in the FC-CCD variant with 17 experiments. The monitored factors were the heating water temperature, which ranged from 50 𝑡𝑜 80 °𝐶; the vacuum pump speed frequency, which ranged from 33 𝑡𝑜 48 𝐻𝑧; and the circulation pump speed frequency, which ranged from 21 𝑡𝑜 25 𝐻𝑧. The dominant factor influencing the amount of recovered condensate was the heating water temperature, while the pump speed frequency was the second most significant factor. The condensate yield per unit of energy consumed was 1.175−1.347 𝑘𝑔/𝑘𝑊ℎ. The measured heat transfer coefficient values corresponded to the equipment's design parameters. Under most operating conditions, the electrical conductivity of the condensate remained below 30 μS/cm, confirming the high purity of the recovered distillate. These results confirm the operational feasibility of the forced-circulation evaporator and form the basis for further research into evaporation processes on tested system.
Forced-circulation evaporator, vacuum evaporation, planned experiment, DOE, wastewater treatment, condensate yield
Date of defence
09.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Byla předvedena prezentace závěrečné práce a zodpovězeny otázky oponenta práce. Dotaz na obtíže a postup při přípravě experimentu, bylo zodpovězeno. Otázka na příčinu oscilačního okna v předmětné technologii a související navržená opatření, bylo zodpovězeno. Otázka na možné důsledky časového omezení navrženého v práci, bylo zodpovězeno.
Language of thesis
Czech
Faculty
Fakulta strojního inženýrství
Department
Institute of Process Engineering
Study programme
Process Engineering (N-PRI-P)
Composition of Committee
prof. Dr. Ing. Marcus Reppich (předseda) doc. Ing. Martin Pavlas, Ph.D. (místopředseda) prof. Ing. Petr Stehlík, CSc., dr. h. c. (člen) prof. Ing. Zdeněk Jegla, Ph.D. (člen) Ing. Pavel Skryja, Ph.D. (člen) Ing. Pavel Lošák, Ph.D. (člen) Mgr. Ing. Marek Vondra, Ph.D. (člen)
Supervisor’s reportMgr. Ing. Marek Vondra, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Jan Kalina
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová