CO2 CAPTURE FROM HEATER STACKS

Abstract

Flue gas containing carbon dioxide is released into the atmosphere at Attock Refinery Limited from the heater which is used to heat process fluids. All of the flue gases are released without any treatment which further aggravates environmental concerns. Our project focuses on capturing and storage of carbon dioxide which is a greenhouse gas and a major proponent of global warming. In order to capture carbon dioxide, we have used two technologies: membrane separation and amine absorption. Membrane separation offers an alternative technology for gas separation because of its simplicity, high energy efficiency, cost competitiveness, small footprint and environmental compatibility compared to pressure swing adsorption and cryogenic distillation. In our case we have discussed some properties and results of CO2 capturing using a basic polyethersulfone membrane. Amine absorption technology uses Monoethanolamine (MEA) which has affinity towards carbon dioxide. This section consists of two main sections; the absorption column and the stripping column. The absorption column allows the carbon dioxide to bind with MEA and the stripping sections facilitates in breaking of the MEA-CO2 bond. The CO2 exiting the stripper from the top can then be captured and stored