Experimental and theoretical investigations of magnesium-chlorine cycle and its integrated systems
Başlık çevirisi mevcut değil.
- Tez No: 403074
- Danışmanlar: PROF. DR. İBRAHİM DİNÇER
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2015
- Dil: İngilizce
- Üniversite: University of Ontario Institute of Technology
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 224
Özet
Özet yok.
Özet (Çeviri)
This study aims to investigate the feasibility of the Mg-Cl hybrid thermochemical cycle and to develop a more cost and energy effective cycle. There are five key elements of this study: (i) modeling and simulation of the Mg-Cl cycle considering both the ideal reference case and realistic operating conditions; (ii) novel configuration developments of the Mg-Cl cycle through literature review of experimental and theoretical studies on the intermediate reaction steps to identify potential cycle improvement options; (iii) experimental investigations to validate the proposed configurations of the Mg-Cl cycle; (iv) comprehensive thermodynamic and thermoeconomic assessments, and optimization of the Mg-Cl cycle; (v) cycle integration with sustainable energy systems and hydrogen storage options. Although a simulation study of the conventional Mg-Cl cycle under ideal operating conditions provides an upper limit for an overall performance of the cycle, it is not an actual indicator about the cycle efficiency under actual conditions. In reality, material and energy inputs well beyond the ideal requirements are necessary to overcome thermodynamic inefficiencies and incomplete reactions throughout the intermediate steps, which significantly affects the cycle performance. Specifying these in a practical model is a more conservative and realistic approach for the cycle simulation; addressing these performance-impacting factors leads the development of various feasible cycle options capable of operating at a level comparable to water electrolysis and other hybrid cycles. The second element of this work develops an additional step to the three-step Mg-Cl cycle for lower power consumption and higher cycle efficiency than the conventional case by considering the literature review of the intermediate cycle steps. This step leads to the integration of two subsequent electrolysis steps, namely dry and aqueous electrolysis of HCl, where the dry HCl electrolysis is a lower power consuming step for hydrogen production than that of aqueous HCl electrolysis; thus, an experimental study is undertaken to capture HCl in dry form. In the light of literature teachings, two experimental procedures are developed to capture HCl from its mixture with steam, and liberate HCl in dry form. The third element experimentally studies several cases to observe HCl capture performance, including testing of the resulting substances in detail using Thermogravimetric Analysis (TGA), and X-ray diffraction (XRD) tests. Results of the experiments show 30.8% HCl capture by solid MgO particles in a packed bed reactor design with an uncertainty value of ∓1.17%. XRD results indicate an optimum reactor temperature of 275ºC to prevent the process from side reactions and undesirable products. Experimental results are adapted to the four-step Mg-Cl cycle to form the final design of the Mg-Cl cycle. The fourth element of the thesis studies the thermodynamics, thermoeconomics, and optimization of the Mg-Cl cycle. Simulation of the final design utilizes the Aspen plus Software package to account for the thermochemistry of all reactions throughout the cycle. A multi-objective optimization process uses Genetic Algorithm (GA) with the results of the thermodynamic analyses, given on a stream-basis, and the economic assessment to maximize plant efficiency and minimize plant cost. The results of thermodynamic and thermoeconomic analyses for the base design of Mg-Cl cycle give energy and exergy efficiency values of 44.3% and 53%, respectively, an annual plant cost of $458.5 million, and a hydrogen production cost rate of 3.67 $/kg. The multi-objective optimization results indicate an increase in exergy efficiency (56.3%), and decrease in total annual plant cost ($409.3 million). Thermodynamic and thermoeconomic results indicate that the final design of the Mg-Cl cycle shows higher hydrogen cost results than that of the Hybrid-sulfur Cycle (HyS) and shows a similar trend with the hybrid Copper-Chlorine (Cu-Cl) cycle. Although the main focus of this study is production of hydrogen, it is also crucial to consider the various means of providing energy input for the Mg-Cl cycle and post-treatment of the hydrogen as a consumer product. The final element of this work integrates the Mg-Cl cycle with two different sustainable energy system and hydrogen treatment options: a solar thermal driven supercritical-CO2 Gas turbine cycle with a 5-stage hydrogen compression plant (System I), and a nuclear heat driven steam Rankine Cycle with a Linde-Hampson Liquefaction plant (System II). Thermodynamic analyses assess and compare the performance of each integrated system, which have resulting energy efficiencies of 16.3% and 18.9%, and corresponding exergy efficiencies of 17.6% and 31.4%, respectively.
Benzer Tezler
- Sülfürlü ve oksitli bileşiklerden ergimiş tuz elektrolizi ile bakır ve alaşımlarının direkt sentezi
Direct synthesis of copper and copper alloys from sulfide/oxide compounds via molten salt electrolysis
LEVENT KARTAL
Doktora
Türkçe
2019
Metalurji Mühendisliğiİstanbul Teknik ÜniversitesiMetalurji ve Malzeme Mühendisliği Ana Bilim Dalı
PROF. DR. SERVET İBRAHİM TİMUR
- Vakumda metalotermik yöntem ile kalsiyum redüksiyonuna etki eden parametrelerin incelenmesi
Investigation of the parameters that affect the vacuum metalothermic method parameters and the calcium reduction
KEREM CAN TAŞYÜREK
Doktora
Türkçe
2018
Metalurji Mühendisliğiİstanbul Teknik ÜniversitesiMetalurji ve Makine Mühendisliği Ana Bilim Dalı
PROF. DR. ONURALP YÜCEL
- Afyonkarahisar (Türkiye) yöresindeki farklı yapı taşlarının tuz hasarında gözenek boyut dağılımının etkisinin araştırılması
The investigation of the effect of pore size distribution on salt damage in different types of building stones in the Afyonkarahisar (Turkey) region
UĞUR AHMET KAÇMAZ
Yüksek Lisans
Türkçe
2023
Maden Mühendisliği ve MadencilikAfyon Kocatepe ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
PROF. DR. MUSTAFA YAVUZ ÇELİK
- Hedefli kanser tedavisine yönelik kil katkılı nanopartikül üretimi ve modellenmesi
Production and modeling of clay additive nanoparticle for targeted cancer treatment
DENİZ KARATAŞ
Doktora
Türkçe
2017
Biyokimyaİstanbul Teknik ÜniversitesiCevher Hazırlama Mühendisliği Ana Bilim Dalı
PROF. DR. MEHMET SABRİ ÇELİK
DOÇ. DR. ADEM TEKİN