7 Matching Results

Search Results

Advanced search parameters have been applied.

Advanced separation technology for flue gas cleanup. Quarterly technical report No. 15

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (1) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (2) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). Our approach is to reduce the capital cost by using high efficiency hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. We will also introduce new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. For example, we will extract the SO{sub 2} from the aqueous scrubbing liquor into an oligomer of dimethylaniline to avoid the problem of organic liquid losses in the regeneration of the organic liquid. Our novel chemistry for scrubbing NO{sub x} will consist of water soluble phthalocyanine compounds invented by SRI and also of polymeric forms of Fe{sup ++} complexes similar to traditional NO{sub x} scrubbing media. Finally, the arrangement of the absorbers is in cassette (stackable) form so that the NO{sub x} absorber can be on top of the SO{sub x} absorber. This cassette (stacked) arrangement makes it possible for the SO{sub 2} and NO{sub x} scrubbing chambers to be separate without incurring ...
Date: February 1, 1996
Creator: Bhown, A.S.; Pakala, N.; Riggs, T. & Tagg, T.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Topical report

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (1) a novel method for regenerating spent SO{sub 2} scrubbing liquor and (2) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub 2} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. The process will generate only marketable by-products. Our approach is to reduce the capital cost by using high-efficiency hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. We will also introduce new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. Our novel chemistry for scrubbing NO{sub x} will consist of water-soluble phthalocyanine compounds invented by SRI as well as polymeric forms of Fe{sup ++} complexes similar to traditional NO{sub x} scrubbing media. The final novelty of our approach is the arrangement of the absorbers in cassette (stackable) form so that the NO{sub x} absorber can be on top of the SO{sub x} absorber. This arrangement is possible only because of the high efficiency of the hollow fiber scrubbing devices, as indicated by our preliminary laboratory data. This arrangement makes it possible for the SO{sub 2} and NO{sub x} scrubbing chambers to be separate without incurring the large ducting and gas pressure drop costs necessary if a second conventional absorber vessel were used. ...
Date: January 1, 1995
Creator: Bhown, A.S.; Alvarado, D.; Pakala, N. & Ventura, S.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Quarterly technical report No. 11, October 1994--December 1994

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). The major cost item in existing technology is capital investment. Therefore, our approach is to reduce the capital cost by using high efficiency hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. We will also introduce new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. For example, we will extract the SO{sub 2} from the aqueous scrubbing liquor into an oligomer of dimethylaniline to avoid the problem of organic liquid losses in the regeneration of the organic liquid.
Date: December 1, 1994
Creator: Bhown, A.S.; Alvarado, D. & Pakala, N.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Quarterly technical report No. 14

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). During the third quarter of 1995, we continued work on Task 8, integrated NO{sub x} life tests. We also obtained some mass transfer data on Task 9, performance of scalable modules. In Task 8, we gathered additional 400 hours of NO{sub x} absorption/desorption data. We also presented the data on NO{sub x} absorption/desorption behavior over cumulative time to date. the performance indicates unchanged reversible characteristics of Co(II) phthalocyanine solution. Therefore, we believe that NO{sub x} absorption/desorption chemistry is robust. In Task 9, we experimentally observed the channeling of liquid flow due to poor design of previous rectangular modules. Newly obtained welded rectangular modules out-performed previous modules. We also presented SO{sub 2} absorption data using different Na{sub 2}SO{sub 3} concentrations. The SO{sub 2} absorption seem to be dependent on liquid flow rate, a rather surprising result compared to earlier results. Apparatus for combined absorption/desorption of SO{sub 2} in rectangular modules is also given in this report.
Date: November 1, 1995
Creator: Bhown, A.S.; Pakala, N.; Riggs, T.; Tagg, T.; Kirkar, K.K.; Majumdar, S. et al.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Quarterly technical report number 13, April--June 1995

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). Work will be conducted in a 60-month period (5/92 to 4/97), encompassing 16 tasks. In Task 8, (Integrated NO{sub x} life tests), the authors have presented the modified experimental arrangement for testing the efficacy of Co(II)-phthalocyanine solution for NO{sub x} absorption as well as desorption over extended periods of time. This arrangement allows them to automatically acquire data and control process parameters. They obtained absorption/desorption data over a period of 140 hours. The data exhibits average NO removal rates of 50%. In order to increase the overall efficiency of the system, they have designed and built a new desorption section with increased mass transfer area. In Task 9, (scalable modules), the authors presented the design details of the rectangular scalable modules. Also, they tested the apparatus with SO{sub 2}/water system. The performance of the device was affected by varying either gas or water flow rates. SO{sub 2} removal rates close to 90% were obtained at 20 SLPM gas flow ...
Date: November 1, 1995
Creator: Bhown, A.; Pakala, N.; Riggs, T.; Tagg, T.; Sirkar, K.K.; Majumdar, S. et al.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Quarterly technical report Number 12

Description: The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (BFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). During the first quarter of 1995, the authors continued work on Task 8, and also began working on Task 9. In Task 8, they have presented the modified experimental arrangement for testing the efficacy of Co(II)-phthalocyanine solution for NO{sub x} absorption as well as desorption over extended periods of time. The key feature of this new experimental setup is to continuously circulate the warm Co(II)-phthalocyanine solution (using a computer) through the HFC in order to avoid precipitation within the fibers. Also, this arrangement allows one to automatically acquire process data. In Task 9, the authors carried out preliminary design calculations to determine the performance of a rectangular module that will be supplied by Setec. Also, they designed and constructed the apparatus for testing these modules.
Date: April 1, 1995
Creator: Bhown, A.S.; Alvarado, D.; Pakala, N.; Riggs, T.; Tagg, T.; Ventura, S. et al.
Partner: UNT Libraries Government Documents Department

Advanced separation technology for flue gas cleanup. Final report, February 1998

Description: The objective of this work by SRI International was to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (1) a novel method for regenerating spent SO{sub 2} scrubbing liquor and (2) novel chemistry for reversible absorption of NO{sub x}. High efficiency, hollow fiber contactors (HFCs) were proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system would be designed to remove more than 95% of the SO{sub 2} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process would generate only marketable by-products, if any (no waste streams are anticipated). The major cost item in existing technology is capital investment. Therefore, the approach was to reduce the capital cost by using high-efficiency, hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. The authors also introduced new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. The process and progress in its development are described.
Date: June 1, 1998
Creator: Bhown, A.S.; Alvarado, D.; Pakala, N.; Tagg, T.; Riggs, T.; Ventura, S. et al.
Partner: UNT Libraries Government Documents Department