Batch Process Design in a Chemical Engineering Education
The following papers have been written by academia and make use of AspenTech software.
In this paper, we discuss the results of a simulation study for a biomass gasifier integrated with a PEM fuel cell. The system study comprises reforming and cleanup units as well. The HYSYS 3.1- ASPEN code has been used for simulation. The biomass source is hazelnut shells. It is desired to investigate both the overall system efficiency and the net electrical efficiency.
Fuel properties, gasification and reforming operation parameters affect the overall system efficiency. The net electrical efficiency is determined by the fuel conversion system efficiencies and fuel cell efficiency as well as on the heat integration within the wholesystem.
Currently, hazelnut shells are combusted in small scale ovens for residential purposes being far away from sustainability. Results indicate that integration of gasification with PEM fuel cell presents a sustainable way of power generation.
This paper summarizes the results of a study for a 100 kWe DCelectrical power PEM fuel cell system. The system consists of a pre-steam reformer, a steam reformer, high and low temperature shift reactors, a preferential oxidation reactor, a PEM fuel cell, a combustor and an expander. Acceptable net electrical efficiency levels can be achieved via intensive heat integration within the PEM fuel cell system. The calculations take into account the auxiliary equipment such as pumps, compressors, heaters, coolers, heat exchangers and pipes. The process simulation package ''Aspen-HYSYS 3.1'' has been used. The operation parameters of the reactors have been determined considering all the technical limitations involved. A gasoline type hydrocarbon fuel has been studied as hydrogen rich gas source. Thermal efficiencies have been calculated for all of the major system components for select edoperation conditions. The fuel cell stack efficiency has been calculated as a function of cell numbers (500, 750, 1000 and 1250cells). Efficiencies of all of the major system components along with auxiliary unit efficiencies determine the net electrical efficiency of the PEM fuel cell system. The obtained net electrical efficiency levels are between 34 (500 cells) to 41% (1250 cells).
This paper presents the results of a study for a 100 kW net electrical power PEM fuel cell system. The major system components are an autothermal reformer, high and low temperature shift reactors, a preferential oxidation reactor, a PEM fuel cell, a combustor and an expander. Intensive heat integration within the PEM fuel cell system has been necessary to achieve acceptable net electrical efficiency levels. The calculations comprise the auxiliary equipment such as pumps, compressors, heaters, coolers, heat exchangers and pipes. The process simulation package ''Aspen-HYSYS'' has been used along with conventional calculations. The operation conditions of the auto thermal reformer have been studied in detail to determine the values, which lead to the production of a hydrogen rich gas mixture with CO concentration at ppm level. The operation parameters of the other reactors have been determined considering the limitations implied by the catalysts involved. A gasoline type hydrocarbon fuel has been studied as the source for hydrogen production. The chemical composition of the hydrocarbon fuel affects the optimum operation conditions of auto thermal reforming and the following fuel purification steps.Thermal efficiencies have been calculated for all of the major system components for selected operation conditions. The fuel cellstack efficiency has been calculated as a function of number of cells (500 to 1250 cells). Efficiencies of all of the major system components along with auxiliary unit efficiencies determine the net electrical efficiency of the PEM fuel cell system. The obtained net electrical efficiency levels are between 30 (500 cells) to 37%(1250 cells). Hence, they are comparable with or higher than those of the conventional gasoline based engine systems. Keywords: Autothermal reforming, hydrocarbon fuel, PEM fuel cell.
As more and more students gain access to computers, the idea of implementing Internet-based chemical engineering courses becomes more of a reality. With web-based learning comes new opportunities and challenges for both faculty and students. In courses where hands-on learning directly facilitated by an instructor is not required, web-based classes offer students the flexibility to complete coursework while still maintaining full-time employment, or when schedule conflicts between classes occur. The independent learning style challenges students to gain a greater understanding of the course material, as interactions between classmates can be limited. A student gains the ability to complete the course at their own pace, which allows the student to blend the needs of the web-based course with other courses or activities.
The key to web-based learning is communication. The ease of communication between the professors and the students, the ability of students to communicate with each other and the ability of the students to easily find and access the information they require are all vital to a successful web-based learning experience. Successful communication in a web-based course is dependent on the web site interface chosen and on the willingness of both the professors and students to utilize the tools of the web site.
This paper explores these issues from the perspectives of two students who have completed the University of Calgary Process Dynamics and Control course via the Internet, and the instructors involved with the course. By investigating the benefits and challenges to web-based learning and offering possible solutions to these challenges, it is shown that web-based learning can become an integral part of any Chemical Engineering program.
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