Project No: FE0009484
Performer: Alstom Power Inc


Richard Dennis
Technology Manager (Acting)
Advanced Combustion Systems
National Energy Technology Laboratory
3610 Collins Ferry Road
P.O. Box 880
Morgantown, WV 26507-0880

Briggs White
Federal Project Manager
National Energy Technology Laboratory
3610 Collins Ferry Road
P.O. Box 880
Morgantown, WV 26507-0880

Herbert Andrus
Principal Investigator
Alstom Power
200 Great Pond Drive
Windsor, CT 06095-1566

Award Date:  10/01/2012
Project Date:  09/30/2016

DOE Share: $8,891,848.00
Performer Share: $2,222,962.00
Total Award Value: $11,114,810.00

Performer website: Alstom Power Inc -

Advanced Energy Systems - Advanced Combustion Systems

Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Retrofit Coal-Fired Power

Project Description

Alstom Power, through prior U.S. DOE funding, has been developing a limestone-based chemical looping combustion technology. The selected project will continue this work by enabling the full analysis of the process through an engineering system and economic study along with the development of a screening tool for process improvements. Additional analyses include an evaluation of pressurizing the limestone chemical looping combustion process.

Alstom’s LCL-C process implementation

Alstom’s LCL-C process implementation.

Program Background and Project Benefits

This project focuses on development of the limestone chemical looping combustion system. The low-cost limestone oxygen carrier along with less-expensive more-efficient reactors drives down capital and operating costs relative to conventional systems. Specifically, this project involves addressing technology gaps and generating data to support scale-up via continuous, stable operation of a 1-MWe prototype system.

Project Scope and Technology Readiness Level

The Phase II objectives are to address the technical gaps identified during Phase I operation of the 3-MWth chemical looping prototype facility and conduct updated techno-economic analyses for a commercial-scale 550-MW coal power plant based on the chemical looping technology. The technology is a promising option for generating power from coal while achieving greater than 90 percent carbon capture and increasing the cost of electricity by no more than 35 percent compared to a new supercritical pulverized coal plant.

The Technology Readiness Level (TRL) assessment identifies the current state of readiness of the key technologies being developed under the DOE’s Clean Coal Research Program.  In FY 12, this project was assessed a TRL of 5.

The TRL assessment process and its results including definition and description of the levels may be found in the "2012 Technology Readiness Assessment-Analysis of Active Research Portfolio".


The project was selected for continuation into Phase II. The final Phase I Technology Engineering Design and Economic Analysis Report has been completed and submitted to DOE. The performance of four Limestone Chemical Looping Combustion (LCL-C™) systems includes overall plant, environmental, and thermal performance plus detailed mass and energy balances for the key process streams and a summary of the key LCL-C™ components and subsystems. Economic evaluations were completed for the plant configurations. The report also provides a summary of the Aspen Plus and Thermoflow models developed for simulation of this case.

Alstom conducted a series of engineering studies, which included methods of pressurizing coal feed to a pressurized reactor, sensitivity of plant efficiency to reducer operating pressure, methods of operating two reactors with different pressures under steady state and load change conditions, modifying or including equipment for process improvements that include solids separation, increasing carbon conversion and the purity of gas leaving the reducer, and finally, methods for condensing and scrubbing moisture from the gas stream. Bench-scale thermogravimetric analysis tests were performed to determine process performance under pressurized conditions with and without the use of LCL-C™ reaction promotion methods.