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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 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 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 1993-08 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Third Quarterly Technical Summary Report on the Homogeneous Production and Removal of NO sub X from Combustion Exhaust Flows 27 Reactions of Sulfur Or Sulfur Compounds with Other Gases Or Vapors

Download or read book Third Quarterly Technical Summary Report on the Homogeneous Production and Removal of NO sub X from Combustion Exhaust Flows 27 Reactions of Sulfur Or Sulfur Compounds with Other Gases Or Vapors written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The addition of ammonia to the exhaust stream of stationary combustors is a promising approach toward reducing NO/sub x/ emissions. The use of high sulfur-content fuels will produce moderate quantities of SO/sub 2/ and other sulfur-bearing compounds which may affect the effectiveness of this thermal deNO/sub x/ process. Modeling efforts indicate that the presence of SO/sub 2/ is slightly beneficial in removing NO above 1250K. In addition, experiments show that the ammonia species (NH/sub i/, i = 1,2,3) have no appreciable reaction rate with SO/sub 2/. An explanation of the effect of SO/sub 2/ on the thermal deNO/sub x/ process is presented, as well as preliminary calculations leading to the measurement of the key reaction of H + SO/sub 3.

Book Fossil Energy Update

Download or read book Fossil Energy Update written by and published by . This book was released on 1981 with total page 886 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 Government Reports Annual Index

Download or read book Government Reports Annual Index written by and published by . This book was released on 1982 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Book Government Reports Announcements Index

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1982 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt: