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Book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Seventh Quarterly Technical Summary Report 1 March 31 May 1980

Download or read book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Seventh Quarterly Technical Summary Report 1 March 31 May 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate constants for the reaction OH + NH3 .-->. NH2 + H2O have been measured over the temperature range 294 - 1075 K. The data can be fit by the Arrhenius expression k(cm3 molecule−1 s−1) = 5.41 +- 0.86 x 10−12 exp( -2120 +- 143 kcal mol−1/RT). A chemical model of the NO/sub x/ chemistry has been developed which includes 54 reactions. Although not yet complete, the reaction set clearly indicates the key reaction is NH2 + NO. The determination of the product channels and their branching ratios is of utmost importance in understanding the effect of NH3 addition to combustor exhaust streams for removal of NO/sub x.

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 1696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Fifth Quarterly Technical Summary Report September 1 November 30 1979

Download or read book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Fifth Quarterly Technical Summary Report September 1 November 30 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate constant for the reaction of NH2 + NO has been measured over the temperature range of 294 to 1200°K. It exhibits a decrease in value with increasing temperatures. An upper limit to the rate of reaction of NH3 + NO .-->. NH2 + HNO is also reported. The hydroxyl radical has been identified as one of the products of the NH2 + NO reaction, and the implications of this upon the modeling is discussed.

Book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Sixth Quarterly Technical Summary Report

Download or read book Homogeneous Production and Removal of NO3 from Combustion Exhaust Gases Sixth Quarterly Technical Summary Report written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The final reaction rate constants for NH2 + NO have been determined. A measurement of the fraction of product channels which form OH provides an approximate value of 0.2, but the uncertainties in the method used make this value a lower limit. Preliminary rate measurements for the reaction of OH + NH3 .-->. NH2 + H2O agree well with previous room temperature experiments and appear to show a simple Arrhenius dependence with temperatures to 1200°K. A chemical model of the NO3 chemistry has been developed and includes approximately 50 reactions at this time. Preliminary runs using this set have reproduced the gross temperature dependence of the thermal deNO3 process.

Book Homogeneous Production and Removal of NO3 from Combustion Exhaust Flows First Quarterly Technical Summary Report

Download or read book Homogeneous Production and Removal of NO3 from Combustion Exhaust Flows First Quarterly Technical Summary Report written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The production and removal of Nox and other combustion products during fossil fuel combustion is a serious environmental problem for both stationary and mobile energy systems. Since stationary systems are faced with increased utilization of coal, oil shale, or synthetic fuel oils, all of which have significant levels of fuel-bound nitrogen, NOx formation may become acute. Recent studies of the production of NOx due to oxidation of fuel nitrogen indicate that a critical role is played by the interaction of NH/sub i/ (i = 1,2,3) species with NO, O2, OH, and H. In fact, these reactions play a vital role in the homogeneous removal of NOx from combustion exhaust streams upon addition of NH3 or NH3-like compounds. Over the past two years, there has been an increased understanding of the chemistry of the NH/sub i//NOx system at combustor exhaust temperatures. For an ammonia addition system to be effective in reducing NO/sub x/ emissions, it must work successfully in the presence of a variety of sulfur-bearing compounds present in the products of combusted coal and oil shale. The work in progress has three major objectives. The first objective is to determine whether the reactions of SO2 (the predominant sulfur-bearing compound present) + NH/sub i/ (i = 1,2,3) directly produce NO/sub x/ in the temperature range of 300 to 1500 K. Depending on the products and value of these rate constants, the effectiveness of NO removal by NH3 could be dramatically affected. The second objective is to screen and evaluate various sulfur-containing scavenger precursors such as SO, SO2, HS, and H2S to assess their impact on the NH/sub i//NO/sub x/ chemical system.

Book Seventh Quarterly Technical Summary Report on the Homogeneous Production and Removal of NOx from Combustion Exhaust Gases

Download or read book Seventh Quarterly Technical Summary Report on the Homogeneous Production and Removal of NOx from Combustion Exhaust Gases written by J. A. Silver and published by . This book was released on 1980 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Government Reports Announcements Index

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1980 with total page 1276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Environmental Pollution Control

Download or read book Environmental Pollution Control written by and published by . This book was released on 1980 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Homogeneous Chemistry of NO3 Production and Removal from Fossil Fuel Combustion Gases Final Technical Report

Download or read book Homogeneous Chemistry of NO3 Production and Removal from Fossil Fuel Combustion Gases Final Technical Report written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reduction of NOx emissions from stationary combustion sources by non-catalytic homogeneous chemical addition is a promising technique. Demonstrations in laboratory experiments and on a number of field scale combustors have shown that the addition of ammonia to the exhaust flow significantly reduces the NO concentrations in a narrow temperature range. This report summarizes the work performed to understand the detailed chemical mechanism which makes this reduction occur. A model describing the NH/sub i//NO/sub x/ chemical system is developed, and rates of the key reactions identified are measured in a high temperature fast flow reactor. Product channels for certain important reactions are also identified. The experimental results are incorporated into the computer code, and the model predictions are compared with laboratory and field test results. Possible additives other than ammonia are evaluated and discussed.

Book The Homogeneous Production and Removal of NOx from Combustion Exhaust Flows

Download or read book The Homogeneous Production and Removal of NOx from Combustion Exhaust Flows written by and published by . This book was released on 1981 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Novel Technologies for SO3 NO3 Removal from Flue Gas Technical Report March 1 1994 May 31 1994

Download or read book Novel Technologies for SO3 NO3 Removal from Flue Gas Technical Report March 1 1994 May 31 1994 written by and published by . This book was released on 1994 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project is to develop a cost-effective low temperature deNOx catalyst to be used in the Research Triangle Institute-Waterloo SO2/NOx process for boiler retrofit applications. The performance goal of the catalyst is to convert over 80% of the NO in the flue gas at a temperature as low as 150°C in the presence of 4% O2, and 10% water. Based on the results obtained in the previous quarter, which showed a La-Cu-ZrO2 catalyst to be a promising low temperature catalyst in the presence of 2% H2O in the reduction of NO to N2 with isobutanol, research was conducted to investigate the variations in feed conditions on the performance of the catalyst. Specifically, the effect of increased H2O concentration and the effect of NO2 in the feed were investigated. Although the activity of the catalyst declined when the H2O concentration was increased from 2 to 10%, the decline was relatively mild compared with that when the water content was changed from 0 to 2%. The effect of NO2 was investigated because oxidation of NO to NO2, a thermodynamically favorable process, proceeds at a finite rate even in the absence of a catalyst. It was found that, under the low temperature reaction conditions, replacement of NO2 with NO did not affect the catalytic performance of the La-Cu-ZrO2 catalyst. Besides studying the La-Cu-ZrO2 catalyst, effort has continued in screening other potential catalysts. A promising 5%Cu-2%Ag catalyst supported on active carbon was found that catalyzes NO reduction by acetone. At 150°C, 35% NO conversion was obtained in the presence of 4% O2 and 8% H2O at a space velocity of 3000 h−1 after 5 h on stream.