CCS and Power Systems

Carbon Capture - Post-Combustion Capture


Bench-Scale Silicone Process for Low-Cost CO2 Capture


Performer: General Electric Company

Project No: FE0007502


Program Background and Project Benefits

The mission of the U.S. Department of Energy/National Energy Technology Laboratory (DOE/NETL) Existing Plants, Emissions, & Capture (EPEC) Research & Development (R&D) Program is to develop innovative environmental control technologies to enable full use of the nation’s vast coal reserves, while at the same time allowing the current fleet of coal-fired power plants to comply with existing and emerging environmental regulations. The EPEC R&D Program portfolio of post- and oxy-combustion carbon dioxide (CO2) emissions control technologies and CO2 compression is focused on advancing technological options for the existing fleet of coal-fired power plants in the event of carbon constraints.

Pulverized coal (PC) plants burn coal in air to produce steam and comprise 99 percent of all coal-fired power plants in the United States. CO2 is exhausted in the flue gas at atmospheric pressure and a concentration of 10 to 15 percent by volume. Post-combustion separation and capture of CO2 is a challenging application due to the low pressure and dilute concentration of CO2 in the waste stream, trace impurities in the flue gas that affect removal processes, and the parasitic energy cost associated with the capture and compression of CO2. Solvent-based CO2 capture involves chemical or physical sorption of CO2 from flue gas into a liquid carrier. Although solvent-based systems are used commercially to remove CO2 from industrial gases, they have not been applied to the removal of large volumes of gas, as in coal-fired power plant flue gas, due to significant cost and efficiency penalties. One promising development for solvent systems is the use of non-aqueous solvents, which can effectively reduce the energy re quirements for regeneration and reuse of the solvent.

The development of a scalable bench-scale process using a novel aminosilicone-based solvent for post-combustion CO2 capture that shows the potential to achieve the DOE goal of 90 percent capture efficiency with a COE increase of less than 35 percent can enable a practical technology path to later development at larger scales and ultimately to commercialization.

Project Goal

The overall project goal is to operate, at bench scale, a post-combustion CO2 capture process using a novel aminosilicone-based solvent system capable of achieving 90 percent CO2 capture efficiency with less than a 35 percent increase in the COE.

Objectives

The project objectives are to generate (1) a technical and economic feasibility study that analyzes the impact of the proposed process on the COE, (2) a COE model that more accurately predicts the capture efficiency and capture costs by incorporating experimental data and material cost information obtained in this program, (3) a technology EH&S assessment aimed at identifying any EH&S concerns associated with the aminosilicone capture system, and (4) a scale-up strategy identifying suitable process configurations for commercial-scale operations, preliminary absorber/desorber and heat transfer equipment designs and architectures, desorber steam requirements, and estimated pressure drops expected in the absorption-cycle components.

Planned Activities

This 27-month project is divided into two phases.

Phase 1:

  • Perform preliminary technical and economic feasibility study.

  • Design and build bench-scale absorption/desorption system.

  • Determine manufacturability of solvent.

  • Develop cost-effective plan for large-scale manufacture.

Phase 2:

  • Synthesize material for bench-scale testing.

  • Perform bench-scale testing to determine scale-up effects and performance of aminosilicone-based solvent system.

  • Determine suitable materials of construction.

  • Develop model of bench-scale system performance and update COE calculations.

  • Perform final technical and economic feasibility study.

  • Develop scale-up strategy.

  • Perform technology EH&S risk assessment.


Project Details