Valorization of the producer gas by removing nitrogen gas in air gasification | |
| Author | Bharali, Bhargab Jyoti |
| Call Number | AIT Thesis no.ET-19-15 |
| Subject(s) | Biomass gasification Gas producers |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Energy |
| Publisher | Asian Institute of Technology |
| Abstract | The main objective of this study is to analyze the possibilities to valorize producer gas of air gasification by removing nitrogen gas. Weighted Sum Method is used for the selection of most suitable process for nitrogen removal and it was found that membrane and pressure swing adsorption method most suitable. And pressure swing adsorption method is selected for further study because of its low investment cost and commercially availability of the adsorbents. Pressure swing adsorption process is simulated and from the results it has been found that when bed pressure is high and flow rate of the feed gas is low, the percentage reduction of nitrogen gas and carbon dioxide is high. As a result of it volumetric calorific value of the producer gas is also high. Effect of bed temperature was found negligible. Simulation results shows that when flow rate is 5 SLPM at 5 bar bed pressure then percentage mole fraction of N2 in the product end will become 8.74%, 10.85% and 4.13% for zeolite13X, activated carbon and cuBTC respectively During the separation of nitrogen gas from air in a single bed adsorption system in the workshop Energy Park in AIT it was seen high influence on percentage of nitrogen gas reduction in the product end compared to feed gas (air), which is directly proportional to the bed pressure and inversely proportional flow rate of the feed gas. Also from the results it can be seen that Zeolite 13X is more suitable compared to activated carbon for nitrogen reduction purpose. For zeolite 13X when the flow rate is 10 SLPM at 5.5 bar pressure the reduction of nitrogen is maximum that is 11.5% and when the flowrate is 20 SLPM at 5.5 bar pressure the reduction become lowest that is 8.8% at that pressure. For activated carbon it can be seen clearly that very minimal reduction of nitrogen occurs during the studied pressure and flow rate range. At the end of the study it was analyzed that pressure swing adsorption with zeolite 13X is the most suitable technology for removal of nitrogen gas and to increase the volumetric calorific value of the producer gas for air gasification. |
| Year | 2019 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy and Environment (EE) |
| Chairperson(s) | Salam, Abdul P.; |
| Examination Committee(s) | Kumar, Sivanappan;Singh, Jai Govind ; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2019 |