Materials Performance

MAY 2015

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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C FEATURE ARTICLE Tracking Corrosion in Real Time in a Carbon Dioxide Capture Plant Carbon dioxide (CO 2 ) capture and seques- tration (CCS) technologies can play an important role in decreasing greenhouse gas emissions by greatly reducing the amount of CO 2 released from new and existing coal- and gas-fired power plants as well as large industrial sources such as cement production and natural gas pro- cessing facilities. 1 The U.S. Inventory of Greenhouse Gas Emissions and Sinks esti- mates that more than 40% of CO 2 emis- sions in the United States is a result of electric power generation; 2 and according to the International Risk Governance Council, electric power plants are respon- sible for approximately one third of global CO 2 emissions. 3 Burning fossil fuels (e.g., coal) to pro- duce electricity emits flue gases that con- tain CO 2 , water vapor, sulfur oxides (SO x ), and nitrogen oxides (NO x ). There are sev- eral methods currently utilized to capture CO 2 from flue gases. The post-combustion method, which can reduce a power plant's carbon emissions by 80 to 90%, is well understood and widely used in the natural gas industry. This method uses a reactive absorption process with amine solvents to separate and capture the CO 2 from the flue gases after the fossil fuel is burned, explains NACE International member Sridhar Srinivasan, global business leader—Corrosion Center of Excellence with Honeywell International, Inc. (Hous- ton, Texas) and chair of NACE's Technol- ogy Exchange Group (TEG) 100X, Sensors: Corrosion and Corrosiveness Sensor Tech- nology, and vice chair of Specific Technol- ogy Group (STG) 62, Corrosion Monitoring and Measurement—Science and Engineer- ing Applications. The CO 2 is captured by passing the flue gases through the liquid amine solvent and the amines selectively dissolve and absorb the CO 2 gas. The sol- vent can be regenerated by heating, which releases the water vapor and leaves a con- centrated stream of CO 2 that can be trans- ported to storage. Different types of amines are typically used (e.g., monoethanolamine [MEA], methyldiethanolamine [MDEA], and others, depending on the type of appli- cation and operating conditions). According to Srinivasan, CO 2 gas is extremely corrosive when it comes into Kathy Riggs Larsen, Associate Editor Burning fossil fuels to produce electricity emits flue gases that contain CO 2 , water vapor, SO x , and NO x . Online Corrosion Monitoring Works with Plant Process Control Systems to Correlate Corrosion Rates with Process Changes 28 MAY 2015 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 54, NO. 5

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