Carbon Capture

2012-09-23T09:16:00.002-07:00

My first journal paper

2012-09-23T05:57:00.000-07:00

First Journal Paper

http://www.sciencedirect.com/science/article/pii/S1876610212011009

2012-09-23T05:51:00.000-07:00

2^nd International Conference on Environmental Pollution and RemediationMontreal, Quebec, Canada, 28-30 August 2012

POSTER for APCRE'11 conference in Beijing, CHINA

2011-08-23T00:05:00.000-07:00

Fourth conference paper

2011-05-27T03:53:00.000-07:00

Case study for flue gas separation of a coal fired power plant and Parameters’ effect on removal efficiency

China (sep 2011)

Udara S.P.R. Arachchige,^a,* Neelakantha Aryal,^aMorten C. Melaaen,^a,b

^aTelemark University College, 3901, Porsgrunn, Norway

^bTel-Tek, Porsgrunn, Norway

The emissions of green house gases are expected to cause global warming and climate change effect. The carbon dioxide is the main green house gas and the major emitting sources are fossil fuel fired power plants and industrial flue gas generation. Emissions can be reduced by improving efficiency of the existing technologies and shifting to carbon free energy sources. This paper presents the case study of flue gas separation in 500MW coal power plant. The complete CO₂ removal process model is implemented in Aspen Plus with selected operating conditions and parameters. Monoethanolamine (MEA) is used as a solvent with 25% concentration. The possible chemical reactions are introduced in Electrolyte NRTL property method. The developed model considered as base case study and temperature, concentration as well as CO₂ loading profiles were examined. The CO₂ removal efficiency variation with different parameters such as, inlet solvent flow rate, lean loading, temperature of flue gas and solvent stream, absorber packing height and diameter, absorber pressure and number of stages in the absorber was analyzed. The sensitivity analysis result show the CO₂ removal efficiency increases with the solvent temperature, packing height, packing diameter and absorber pressure. The reverse is applicable with flue gas temperature, lean loading and number of stages. When the flue gas temperature, lean loading or number of stages is increased, removal efficiency decreases. It can be conclude that above listed parameters are most important when implementing the removal process in industrial flue gas purification.

POSTER for TCCS-6 conference, Trondheim, NORWAY

2011-05-10T06:47:00.000-07:00

Few snaps from First conference in Pittsburgh,USA

2011-05-08T09:55:00.001-07:00

POSTER for PA conference, USA

2011-04-27T05:25:00.000-07:00

Second conference paper

2011-04-16T06:07:00.000-07:00

Florida, USA (June, 2011)

Comparison of temperature profiles in CO₂ removal process with Aspen Plus and MATLAB

Udara S.P.R. Arachchige¹, Sanoja A. Jayarathna¹, Morten C. Melaaen^{1, 2}

¹Telemark University College, Porsgrun, Norway

²Tel-Tek, Porsgrunn, Norway

Abstract The power generating sector is identified to be the main source of CO₂ emission. Due to the climate change effect, CO₂capture technologies are being important in current scenario. Out of several gas cleaning methods, post combustion CO₂ removal by chemical absorption technology is the closest to commercialization. This paper presents a simulation study of the chemical absorption process with the MEA system as the solvent. Data found in literature (Texas case 32 and case 47) are compared with the simulation results. Two models are developed and implemented in Aspen Plus and MATLAB with the same physical properties to represent the absorber given in the Texas pilot plant study. The rate based Electrolyte NRTL model is used in the Aspen Plus model and the Kent-Eisenberg (K-E) model is selected for the development of the rate based MATLAB model. Model simulations are done using 32.5[w/w %] MEA solution and 0.28 [mol CO₂/mol MEA] lean CO₂ loading. Simulations are performed by forcing the CO₂ removal efficiencies to be the same as in the pilot plant study. The simulation results from the Aspen Plus and MATLAB models are compared using the temperature profiles. Both models follow similar patterns for the temperature profiles and those approximately equal with the Texas plant data.

First conference paper

2011-04-16T06:03:00.000-07:00

PA, USA (May 2011)

CO₂-flue gas separation for a gas-fired power plant

Udara S.P.R. Arachchige¹, Neelakantha Aryal¹

Morten C. Melaaen^1,2

¹Telemark University College, Porsgrunn, Norway

²Tel-Tek, Porsgrunn, Norway

Abstract

Combustion of fossil fuels are the main sources of CO₂ emission. The energy requirement, high capital and operating cost are the challenges regarding the CO₂ capture. Absorption is the most common technique for CO₂ removal today and one of the viable options for CO₂ capturing from power plants. In this paper, comprehensive flow sheet has been developed for post combustion CO₂ removal system with Aspen Plus. The CO₂ removal from 500MW natural gas-fired power plant flue gas was considered. The parameters and other operating conditions are selected to achieve 85% of CO₂ removal.

The rate based Electrolyte NRTL property method is used in Aspen Plus to implement an open cycle model with 25^w/_w % MEA solution and 0.25mol CO₂/mol MEA as lean loading. Efficiency of the removal process was specified as a design specification option in Aspen Plus with the variation of distillate rate in the stripper. The sensitivity analysis was performed to check the parameter effect on removal efficiency and re-boiler duty. As a result of sensitivity analysis, the optimal operating conditions for absorber and stripper were selected.

The complete removal process with solvent recycling back to the absorber is implemented with the sequential modular method in Aspen Plus. The re-boiler duty requirement on 85% CO₂ removal was calculated as 4500 kJ/kg CO₂. Temperature and concentration profiles as well as CO₂ loading were analyzed to check the model behavior.

CO2-flue gas separation

2011-04-13T07:52:00.000-07:00

Coal power plants play a vital role in modern world electricity generation. Electricity generation from the coal-fired power plants is the largest single source CO₂ emission.

The total electricity generation according to the source is given in the following figure 1. The coal is used for around 41% electricity generation.

Figure 1: Electrical energy generation by different sources

There are six main pollutant gases cause for climate change, CO₂, CH₄, N₂O, SF₆, CFC’s and HFC’s. The global warming potential for those gases is given in the table 1. However, CO₂ has lowest global warming potential. It has highest climate change potential due to the largest emission compare to others. Thus, reduction of CO₂ is very important for create a better environment.

Technologies available or being considered for CO₂ capture are:

In order to carry on power generation by fossil fuel, CCS technologies are required to reduce the environmental impact by CO₂ emissions. The post combustion CO₂ capture via chemical absorption is the most effective and widely used technology in the CO₂ recovery process.