Optimization of Vacuum Pressure Swing Adsorption Processes To Sequester Carbon Dioxide from Coalbed Methane

Abstract

This paper introduces an efficient scale-up design technology based on mathematical modeling and optimization approach. The target process is a vacuum pressure swing adsorption process which is preferred in purifying unconventional gas such as coalbed methane or landfill gas by sequestering carbon dioxide. The optimization results are validated very well from a pilot scale (10 N m 3 /h) to a large commercial scale (5000 N m 3 /h). The simulation and optimization model for the scale up design is established in gPROMS custom modeling tool. Judging from the reasonably very small differences between the optimization results and the vendor suggested data, it can be concluded that the scale-up design is very successful not by depending on the experimental and real plant experiences but by using a mathematical optimization modeling approach.

Dynamic Optimization of a Dual Pressure Swing Adsorption Process for Natural Gas Purification and Carbon Capture

“…In this study, a carbon molecular sieve (CMS) is used. The CMS-type adsorbent is already popular in the PSA process and has a good pressure resistance compared to the zeolites while the zeolites have a good adsorption efficiency at vacuum condition. − To apply an accurate adsorption isotherm to the model, the CMS from the research of Bae and Lee is adopted . In 2005, they analyzed adsorption isotherms of a CMS type adsorbent.…”

Enriching Low-Concentration Coalbed Methane Using a Hydrophobic Adsorbent under Humid Conditions

“…Meanwhile, CH 4 is a vital raw material that is extensively used in chemical industries such as methane-to-methanol and methane-to-light olefins; however, it is also a more active greenhouse gas with a greenhouse effect 21 times greater than that of CO 2 . As the associated resource of coal, coalbed methane (CBM), which mainly contains CH 4 , is regarded as a type of important unconventional natural gas. , Limited by geological factors, most CBM reservoirs present strong compactness and poor permeability, especially in China, leading to low quality and output, called low-concentration CBM. CH 4 is mainly adsorbed on the surface of the coal matrix and released from the coal seam in the coal mining process, which is mixed with air producing about 20–30% CH 4 in the pumped low-concentration CBM with a lack of efficient solution .…”

Three‐dimensional characterization of open and closed coal nanopores based on a multi‐scale analysis including CO2 adsorption, mercury intrusion, low‐temperature nitrogen adsorption, and small‐angle X‐ray scattering

“…The calorific value of unconventional natural gas can reach up to 8000 kCal/m 3 , and the development of natural gas can make up for the shortage of conventional natural gas reserves in China to a large extent . Compared to other countries, China's gas reservoirs are characterized by low saturation, low permeability, low reservoir pressure, and high metamorphism.…”