CCS and Power Systems

Carbon Capture - Post-Combustion Capture


Low-Pressure Membrane Contactors for Carbon Dioxide Capture


Performer: Membrane Technology & Research Inc.

Project No: FE0007553


Program Background and Project Benefits

The mission of the U.S. Department of Energy/National Energy Technology Laboratory (DOE/NETL) Carbon Capture 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 Carbon Capture R&D Program portfolio of carbon dioxide (CO2) emissions control technologies and CO2 compression is focused on advancing technological options for new and existing coalfired power plants in the event of carbon constraints.

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. Membrane-based CO2 control technologies utilize permeable or semi-permeable materials that permit the selective separation of CO2 from flue gas and have the potential to effectively reduce the energy penalties and costs associated with post-combustion CO2 capture for both new and existing pulverized coal (PC)-fired power plants.

Development of this new type of very large area membrane contactor module can increase the feasibility of using membrane technology to separate CO2 from the low-pressure, dilute flue gas from coal-fired power plants. The cost and complexity of manifolding membrane modules and the footprint of the membrane system for commercial power plants can be considerably reduced by development of the new mega-modules. Energy savings resulting from the reduced pressure drop of gases circulating through the modules, as well as improved countercurrent flow, are additional benefits. The availability of this type of module also opens up the possibility of creating synergistic hybrid combinations of CO2 capture technologies capable of meeting DOE performance goals.

Primary Project Goal

The primary project goal is to build and operate a 500 m2 prototype low-pressure countercurrent flow sweep membrane module and evaluate its potential—in an all-membrane process and in hybrid processes—to significantly contribute to the DOE goal of capturing at least 90 percent of the CO2 from coal-fired power plant flue gas with less than a 35 percent increase in the cost of electricity.

Objectives

The project objectives are to (1) prepare modules with an effective membrane area of 500 m2, (2) perform parametric testing with synthetic flue gas, (3) validate that module pressure drop is less than 1.5 psi, (4) analyze the cost and efficiency of the modules for an all-membrane process and for hybrid processes, (5) determine strategies to maximize CO2 enrichment for the membrane unit, and (6) develop a plan to integrate the technology for potential field testing.

Planned Activities

  • Construct and evaluate several small prototype membrane modules (20 m2).

  • Select the best design for further development.

  • Select module components and sealing techniques.

  • Construct and evaluate intermediate size modules (100 m2).

  • Select the final geometry.

  • Refine CFD process simulation of module.

  • Construct and test a full-size module (500 m2).

  • Complete design and feasibility evaluations incorporating the new module design with other CO2 capture systems.


Project Details