Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
On the use of heat exchange’s devices in order to improve adsorption and desorption processes of ANG tanks
Submission Author:
Bruno Chieregatti , SP
Co-Authors:
João de Sá Brasil Lima, Ernani Volpe, Marcelo Hayashi, Bruno Chieregatti
Presenter: Bruno Chieregatti
doi://10.26678/ABCM.COBEM2017.COB17-0917
Abstract
In recent years, the Adsorbed Natural Gas (ANG) technology has been identified as the most promising low-pressure alternative for storing natural gas. Although ANG does not attain the same capacity of liquefied natural gas (LNG) systems, it provides a method for storing gas at substantially higher concentration than can be achieved with simple compression (Compressed Natural Gas - CNG), and dismiss the use of refrigeration. One important issue on the use of this technology is to improve the adsorption (filling) and desorption (deflation) processes. This is achieved by increasing the relation between the volume of stored gas at ambient conditions and the volume of the tank (known as V/V). Due to the physics of the process, the gas temperature increases during adsorption, hence it decreases the adhesion of molecules to the adsorbent. The opposite occurs in the desorption process, when the temperature decreases, thus making it more difficult to release the gas. In order to improve these processes, this work focuses on the use of heat exchanger devices. To show the influence of these devices on the processes, numerical transient 2D axi-symmetric simulations are carried out, by using a finite-element platform FreeFEM++, and on considering that the flow is governed by Navier-Stokes equations, ruled by Darcy’s law. For each test case, the V/V relation and the mass of gas will be calculated and compared, to show the influence of the devices. This article is a project from the Research Centre for Gas Innovation (RCGI), which started in 2016, with support from BG Shell and FAPESP.
Keywords
Adsorption, natural gas, Storage Vessels, Heat Exchangers
