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Title: Minimize Solvent Oxidation with NO X Pre-Scrubbing

Abstract

A novel method to remove nitrogen dioxide (NO 2) from the flue gas of coal-fired power plants with CO 2 capture was further developed for commercial implementation. The technology leverages the equipment and chemistry in an existing (sulfur dioxide) SO 2 polishing scrubber upstream of the main CO 2 capture unit to remove the NO 2, preventing degradation of the CO 2 capture solvent and formation of nitrosamines (environmental hazards). The research in this report focuses on further evaluation of the chemical additives and operating conditions associated with the NO 2 removal process to define conditions for commercial scale testing and deployment. Experimental work systematically evaluated a series of potential additives to minimize the oxidation of sulfite in a representative SO 2 pre-scrubber solution (sulfite, in turn, absorbs NO 2). The additive combinations and concentrations were varied alongside important process conditions such as temperature, oxygen concentration, and metals present in solution to mimic the conditions expected in a commercial system. Important results of the parametric experimental work include identifying a new, potent sulfite oxidation inhibitor, revealing the importance of combining inhibitors with metal chelating agents, validation of a low-cost additive process, and development of a new semi-empirical model to representmore » mechanisms associated with sulfite oxidation. In addition, the experimental work reveled the impact of operating at higher temperatures (representative of a field test unit), which will guide the selection and concertation of additives as well. Engineering analysis found that waste solutions from the pre-scrubber with NO 2 additives may potentially be integrated with existing processes on site (e.g., flue gas desulfurization unit). In addition, techno-economic analysis identified potential net savings as large as $1.30/tonne CO 2 captured and quantified the potential benefit of low cost additive options actively being pursued by the development team. Finally, the experimental results and engineering analysis supported the development of a detailed field testing plan and protocol to evaluate the technology at near-commercial scale. The field test preparation included development of procedures to introduce chemical additives to an existing SO 2 polishing unit and identification of representative flue gas conditions based on a review of existing plants. These activities will have direct bearing on operation and design of commercial units.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Trimeric Corporation, Buda, TX (United States)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Trimeric Corporation, Buda, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
National Carbon Capture Center; Southern Company
OSTI Identifier:
1407692
Report Number(s):
DOE-Trimeric-15890
DOE Contract Number:  
SC0015890
Type / Phase:
SBIR (Phase I)
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 42 ENGINEERING; 54 ENVIRONMENTAL SCIENCES; CO2 capture; NO2 scrubbing; nitrosamine; oxidation; amines

Citation Formats

Sexton, Andrew, Sachde, Darshan, Vance, Austyn, Fisher, Kevin, Selinger, Joseph, Fischer, Kent, and Rochelle, Gary. Minimize Solvent Oxidation with NOX Pre-Scrubbing. United States: N. p., 2017. Web.
Sexton, Andrew, Sachde, Darshan, Vance, Austyn, Fisher, Kevin, Selinger, Joseph, Fischer, Kent, & Rochelle, Gary. Minimize Solvent Oxidation with NOX Pre-Scrubbing. United States.
Sexton, Andrew, Sachde, Darshan, Vance, Austyn, Fisher, Kevin, Selinger, Joseph, Fischer, Kent, and Rochelle, Gary. Tue . "Minimize Solvent Oxidation with NOX Pre-Scrubbing". United States. doi:.
@article{osti_1407692,
title = {Minimize Solvent Oxidation with NOX Pre-Scrubbing},
author = {Sexton, Andrew and Sachde, Darshan and Vance, Austyn and Fisher, Kevin and Selinger, Joseph and Fischer, Kent and Rochelle, Gary},
abstractNote = {A novel method to remove nitrogen dioxide (NO2) from the flue gas of coal-fired power plants with CO2 capture was further developed for commercial implementation. The technology leverages the equipment and chemistry in an existing (sulfur dioxide) SO2 polishing scrubber upstream of the main CO2 capture unit to remove the NO2, preventing degradation of the CO2 capture solvent and formation of nitrosamines (environmental hazards). The research in this report focuses on further evaluation of the chemical additives and operating conditions associated with the NO2 removal process to define conditions for commercial scale testing and deployment. Experimental work systematically evaluated a series of potential additives to minimize the oxidation of sulfite in a representative SO2 pre-scrubber solution (sulfite, in turn, absorbs NO2). The additive combinations and concentrations were varied alongside important process conditions such as temperature, oxygen concentration, and metals present in solution to mimic the conditions expected in a commercial system. Important results of the parametric experimental work include identifying a new, potent sulfite oxidation inhibitor, revealing the importance of combining inhibitors with metal chelating agents, validation of a low-cost additive process, and development of a new semi-empirical model to represent mechanisms associated with sulfite oxidation. In addition, the experimental work reveled the impact of operating at higher temperatures (representative of a field test unit), which will guide the selection and concertation of additives as well. Engineering analysis found that waste solutions from the pre-scrubber with NO2 additives may potentially be integrated with existing processes on site (e.g., flue gas desulfurization unit). In addition, techno-economic analysis identified potential net savings as large as $1.30/tonne CO2 captured and quantified the potential benefit of low cost additive options actively being pursued by the development team. Finally, the experimental results and engineering analysis supported the development of a detailed field testing plan and protocol to evaluate the technology at near-commercial scale. The field test preparation included development of procedures to introduce chemical additives to an existing SO2 polishing unit and identification of representative flue gas conditions based on a review of existing plants. These activities will have direct bearing on operation and design of commercial units.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 07 00:00:00 EST 2017},
month = {Tue Nov 07 00:00:00 EST 2017}
}

Technical Report:
This technical report may be released as soon as November 7, 2021
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