scholarly journals Implementing of a Usable Tool for Selecting Operations to Upgrade Biogas to Biomethane

2021 ◽  
Vol 9 (3) ◽  
pp. 39-45
Author(s):  
L. García Gómez ◽  
◽  
S. Luque ◽  
A. M Gutiérrez ◽  
J. R, Arraibi ◽  
...  
Keyword(s):  
Natural Gas ◽  
Circular Economy ◽  
Renewable Energies ◽  
Simulation Tool ◽  
Unit Operations

In Spain, biomethane and biogas are still starting to be considered as an alternative to natural gas. A good way of promoting these renewable energies is supporting small and cheap treatment plants near to the place where the biogas is produced and where the biomethane can be used on site, fostering the circular economy. An easily usable simulation tool for selecting the best sequence of unit operations for treating biogas (based on adsorption, absorption, and membranes) has been designed. Pollutants modelled are CO2, CH4, NH3, SH2, CO2, O2, N2, H2O and siloxanes. This tool was used as first step to design a flexible and portable prototype for treating small flows of biogas as those produced in livestock which has been later built and is on operation.

scholarly journals ENERGIAS RENOVÁVEIS NO CONTEXTO DA ECONOMIA CIRCULAR: UM ESTUDO BIBLIOMÉTRICO DA LITERATURA INTERNACIONAL / RENEWABLE ENERGIES IN THE CONTEXT OF CIRCULAR ECONOMY: A BIBLIOMETRIC STUDY OF INTERNATIONAL LITERATURE

2021 ◽  
Vol 7 (2) ◽  
pp. 19110-19124
Author(s):  
Josivan Leite Alves ◽  
Milton Jarbas Rodrigues Chagas ◽  
Cristiano Viana C. Castellão Tavares ◽  
Emília de Oliveira Faria ◽  
Armando de Azevedo Caldeira-Pires
Keyword(s):  
Circular Economy ◽  
Renewable Energies ◽  
Bibliometric Study ◽  
International Literature

scholarly journals Simulation of Dual Mixed Refrigerant Natural Gas Liquefaction Processes Using a Nonsmooth Framework

Processes ◽  
2018 ◽  
Vol 6 (10) ◽  
pp. 193 ◽  
Author(s):  
Matias Vikse ◽  
Harry Watson ◽  
Truls Gundersen ◽  
Paul Barton
Keyword(s):  
Natural Gas ◽  
Heat Exchangers ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Aspen Plus ◽  
Large Temperature ◽  
Scale Production ◽  
Simulation Tool ◽  
Natural Gas Liquefaction ◽  
Feasible Solutions

Natural gas liquefaction is an energy intensive process where the feed is cooled from ambient temperature down to cryogenic temperatures. Different liquefaction cycles exist depending on the application, with dual mixed refrigerant processes normally considered for the large-scale production of Liquefied Natural Gas (LNG). Large temperature spans and small temperature differences in the heat exchangers make the liquefaction processes difficult to analyze. Exergetic losses from irreversible heat transfer increase exponentially with a decreasing temperature at subambient conditions. Consequently, an accurate and robust simulation tool is paramount to allow designers to make correct design decisions. However, conventional process simulators, such as Aspen Plus, suffer from significant drawbacks when modeling multistream heat exchangers. In particular, no rigorous checks exist to prevent temperature crossovers. Limited degrees of freedom and the inability to solve for stream variables other than outlet temperatures also makes such tools inflexible to use, often requiring the user to resort to a manual iterative procedure to obtain a feasible solution. In this article, a nonsmooth, multistream heat exchanger model is used to develop a simulation tool for two different dual mixed refrigerant processes. Case studies are presented for which Aspen Plus fails to obtain thermodynamically feasible solutions.

scholarly journals Possibilities of measuring hydrogen in natural gas

2021 ◽  
Vol 11 (5) ◽  
pp. 188-194
Author(s):  
Ildikó Bölkény ◽  
Gábor Hegyi ◽  
Angéla Váradiné Szarka
Keyword(s):  
Natural Gas ◽  
Hydrogen Content ◽  
New Technology ◽  
Gas Storage ◽  
End Users ◽  
Renewable Energies ◽  
Gas Mixture ◽  
Hydrogen Sensors ◽  
Natural Gas Storage

Green hydrogen produced by renewable energies is an innovative use of mixed with natural gas to deliver the mixture to end users using existing natural gas storage and networks, thereby achieving increased performance. In such a new technology, measuring the hydrogen content of a hydrogen natural gas mixture is essential. This paper provides an overview of hydrogen sensors.

Sign in / Sign up

Export Citation Format

Share Document