Connect with us

Hi, what are you looking for?

CleanTechnica
A long-running utility-scale pilot capturing CO2 from the flue gas of a 2,120 MW coal fired power plant in Wyoming is succeeding in capturing about a third of the carbon dioxide by mineralizing it in fly ash, according to a report at Energy Prospects.

Fossil Fuels

CCS Pioneer Reddy Patents New CO2 Sequestration Tech

A long-running utility-scale pilot capturing CO2 from the flue gas of a 2,120 MW coal fired power plant in Wyoming is succeeding in capturing about a third of the carbon dioxide by mineralizing it in fly ash, according to a report at Energy Prospects.


A long-running utility-scale pilot capturing CO2 from the flue gas of a 2,120 MW coal fired power plant in Wyoming is succeeding in capturing about a third of the carbon dioxide by mineralizing it in fly ash, according to a report at Energy Prospects.

It is no mere lab test. Dr KJ Reddy, a professor at the University of Wyoming School of Energy Resources, is the pioneer in taking highly alkaline ash from oil shale combustion to a more stable state to be more environmentally friendly, and his pioneering research, published over the last three decades in the Journal of Environmental Quality and the Environmental Science and Technology Journal, laid the groundwork for mineral carbonation studies by other scientists, engineers and researchers. These studies are the basis for Carbon Capture and Storage (CCS) technologies.

His new CCS process (SequesTech) has now run continuously for 7 years in a 2,120 MW coal plant, removing 25 to 30 percent of the CO2 from 300 to 500 standard cubic feet per minute of flue gas with a concentration of 11 to 12.5 percent CO2.

The process sequesters CO2 emissions in fly ash in the smokestacks of coal-fired power plants. Reddy’s three decades of research on speeding up the natural process of CO2 absorption by mineralization is the basis of the development.

He hopes his SequesTech process will be ready for commercial application “within a year or so.” He said the technology is estimated to cost $10 to $12 per ton of mineralized (sequestered) CO2.

“The ash, or fly ash, serves as a sink for the CO2,” Reddy said of his process, which runs flue gas through a fluidized bed reactor containing fly ash captured by a coal plant’s bag houses. “In turn, the CO2 fixes the toxic and heavy metals in the ash. This is a natural process, but very slow. So we needed to figure out how to speed it up.”

Unlike other carbon capture processes being considered, which would require additional energy to isolate, pressurize, transport and inject CO2 deep under ground, this uses no energy, other than to run the fans that blow the flue gas through the reactors. It also binds the carbon, making it safer than sequestration. The fly ash used to sequester the CO2 and other pollutants could also still be used safely in most traditional fly ash applications, such as gypsum.

Reddy’s SequesTech process is also capturing most of the SO2 and 80% of flue gas mercury as well – making this a potential game changer for climate protection – because regardless of how it quibbles over carbon, the coal industry already has to use some means to reduce its mercury and SO2. This kills 3 birds with one stone.

 
Appreciate CleanTechnica’s originality? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.
 
 

Advertisement
 
Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Written By

writes at CleanTechnica, CSP-Today and Renewable Energy World.  She has also been published at Wind Energy Update, Solar Plaza, Earthtechling PV-Insider , and GreenProphet, Ecoseed, NRDC OnEarth, MatterNetwork, Celsius, EnergyNow, and Scientific American. As a former serial entrepreneur in product design, Susan brings an innovator's perspective on inventing a carbon-constrained civilization: If necessity is the mother of invention, solving climate change is the mother of all necessities! As a lover of history and sci-fi, she enjoys chronicling the strange future we are creating in these interesting times.    Follow Susan on Twitter @dotcommodity.

Comments

You May Also Like

Climate Change

Climeworks' first carbon capture prototype starts operating in Iceland.

Carbon Pricing

Alberta's crude oil from steam-assisted gravity drainage has a carbon debt just for extraction and in province processing that's as large as the total...

Cars

A recent article published in Forbes was pretty quick to point out what the author thought Tesla's problem was. "It's Volkswagen. VW's ID.3 has...

Climate Change

In Part Two, we explore how Ford and GM funded climate denial and gamed the fuel economy system.

Copyright © 2021 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.