Methane reforming simulation dating, my account
At the same time the cross-section area of the reactor had to be increased almost 10 times to get the throughput that was necessary to have equal production of hydrogen.
Kinetic models for all major reactions must be formulated to simulate the sorption enhanced steam methane reforming reactor. The 1-particle model considers one type of pellet in the reactor consisting of both catalytic and sorbent material, while the 2-particle model considers two separate pellet types with catalytic and sorbent material.
Unpublished PDF Download Kb Abstract Hydrogen production technologies have emerged as a one of the most researched and promising future global energy. This is an alternative to the traditional steam methane reforming SMR for production of hydrogen.
However, while the shape of the rate expression was similar for the two zirconates, the reaction rates did differ substantially.
For this technology, hydrogen is mostly produced from hydrocarbons. The performance of Li4SiO4 is between these two materials. In all reactor simulations it was found that there will be large temperature gradients in the reactor even if the total reaction is not college hookup culture definition endothermic.
The software also allows us to study and analyze the process directly, by manipulating the process variable and unit operation topology. Producing hydrogen with a total lower heating value of MW the necessary reactor cross-sectional area was about 20 m2 for the simulation with Na2ZrO3 as sorbent, while the necessary crossectional area for Li2ZrO3 were m2.
The lithium zirconate had the slowest capture rate of the materials; with a kinetic constant about times lower than the one for sodium zirconate, which showed the fastest kinetics. A robust transient one dimensional model has been formulated and implemented for the simulations of the reforming reactor.
From the simulation plant model, an analysis on the causes and effects of the methane slippage process is determined based on variation of composition in feedstock natural gas. Hydrogen economy is a vision for future in with hydrogen replaced conventional power sources to reduce addiction on non-renewable energy and to drastically reduced harmful emissions to the environment.
Simulation of Methane Slippage in Steam Methane Reforming - UTPedia
The process utilizes a solid CO2-acceptor to capture CO2 in the reforming reactor and thereby change the normal thermodynamic limitations of steam methane reforming. The data on regeneration has been limited and the process sizing and performance is mainly based on the reforming being the limiting factor.
If a fixed bed reactor is operated without external heating, the temperature close to the inlet will decrease dramatically, while the outlet temperature will increase. The results from the reactor simulations have been incorporated in computer simulations of the whole process of producing pure hydrogen by SE-SMR.
SE-SMR is a concept that has received increased attention in recent years. The efficiency is very dependent on the amount of heat that must be supplied to the reactor in the regeneration step and the CO2-sorption kinetics of the sorbent.
The capture rate on lithium silicate was found to be between the two other materials.
Best viewed using Mozilla Firefox 3 or IE 7 with resolution x With all other parameters equal the thermal efficiency fell from 0. The two heterogeneous models are different in the way the solid materials are placed in the reactor. Two of the materials, nanocrystalline lithium zirconate and sodium zirconate have been synthesized at NTNU, while the lithium silicate was obtained from Toshiba.
There are two steps to be follow in order to develop and analyze the simulation plant model, begin with base case development and base case validation. The steam methane reforming reactions have been extensively studied earlier, and the kinetic model of Xiu and Froment was used in the simulations.
If the kinetics of CO2-sorption could be increased, giving higher hydrogen content in the product, an increased CO2 removal can be reached without lowering the thermal efficiency.
Institutt for kjemisk prosessteknologi  Abstract An increased demand for hydrogen as energy-carrier and as fuel for clean power generation is expected during the 21st century. UTPedia with full text are accessible for all registered users, whereas only the physical information and metadata can be retrieved by public users.
Aspen HYSYS provides tool to design a steady and dynamics state simulation plant model of hydrogen production from methane. A thermal efficiency of 0. It stores digitized version of thesis, dissertation, final year project reports and past year examination questions.
On this research, a simulation plant model using steam methane reforming has been designed to observe methane slippage effect at reformer. The work in this thesis has focused on simulation of hydrogen production by sorption enhanced steam methane reforming in a fixed bed reactor.
Simulation of Methane Slippage in Steam Methane Reforming
The thermal efficiency of this process was about 0. Publisher Norges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for kjemisk prosessteknologi Series. Sorption enhanced reforming, regeneration of sorbent, heating and cooling of the reactor bed, CO2 compression, H2 purification by presure swing adsorption, and heat integration of the process are the main parts of the hydrogen production process.
The materials synthesized at NTNU showed quite similar kinetic properties, and the capture rate of CO2 was described by a first order rate reaction with respect to fractional conversion of the solid. Different solid synthetic materials for the high temperature CO2 capture have been studied, and kinetic models for capture of CO2 on these materials have been formulated in this thesis.
The thermal efficiency is comparable and better than for autothermal reforming with CO2 removal by an amine process.