nox pollution Articles

  • Chemical Aspects of NOX Scrubbing

    With the passage of the 1990 Clean Air Act Amendments, many chemical and metal industries and utility producers will now be required to further limit the amount of NOX (Nitrogen Oxides) produced. NOX is a precursor to ozone in the atmosphere, and is believed to be a major contributor to acidic deposition (acid rain). Formation of ozone: NO2 + Hv ...


  • NOx Scrubbing Technology Breakthrough

    Pacific Rim Design and Development and Dupont are proud to introduce a technology breakthrough in the treatment and safe elimination of problematic nitric oxide (NO) and nitrogen dioxide (NO2 ).  There are six forms of nitrogen oxide (NOx); the drawings to the right show the two most problematic forms.  These two are of particular interest because they are identified as atmospheric ...


  • The Chemical Aspect of NOx Scrubbing

    With the passage of the 1990 Clean Air Act Amendments, many chemical and metal industries and utility producers will now be required to further limit the amount of NOx (Nitrogen Oxides) produced. NOx is a precursor to ozone in the atmosphere, and is believed to be a major contributor to acidic deposition (acid rain). Formation of ozone: NOx is produced in a variety of ...


    By CR Clean Air Group, LLC

  • What is Indoor Air Quality?

    Indoor Air Quality (IAQ) refers to the degree of air purity inside buildings that constitute the usual environment in which people carry out activities (offices, homes, schools, shopping and leisure centres, etc.) Because of increasing urbanisation and our contemporary lifestyle, most people spend a large proportion of their time in these closed environments. The high level of atmospheric ...


    By Bioconservacion SA

  • Lagrangian modelling evaluation of the NOx pollution reduction due to electric vehicles introduction

    In this paper, the problem of the atmospheric pollution due to the traffic emission from a large freeway is faced. To this aim, numerical simulations were performed and compared with measured data in a real case. The Lagrangian particle model includes a simple chemical scheme for the reactions between NOx and ozone. The results, compared with a field experiment taken in the ...


    By Inderscience Publishers

  • Theory of Cost Effective NOx Control

    NOx is one of the primary air pollutants emitted from combustion processes and environmental regulations are the only driver forcing industry to install NOx control systems. In the Houston Galveston area alone, there is over 6,000 point sources that would need to be controlled to comply with the new State Implementation Plan adopted by the TNRCC. Many in the industry are in the process of ...

  • Case No : 601: Reducing NOx emissions from Nirtic Acid Manufacturing Plants with NOx Abatement or NSCR

    NOx Abatement is a Non-Selective Catalytic Reduction (NSCR) technology that has a long and proven track record for controlling NOx emissions from nitric acid manufacturing plants. It can be used to alter the NO to NO2 balance (decolourization) or to eliminate NOx through catalytic reaction with a fuel as a reductant. ...

  • NOx re-burn simulation in a double-jet counter-flow flame

    The paper investigates the main features of NOx emission in a laminar double-jet counter-flow diffusion flame for later use as a possible physical model for NOx reduction through turbine in situ reheat. The oxidizer stream consists of exhaust gas resulted from a conventional combustor and the fuel stream is represented by an air?methane mixture. The main interest rests on the distribution of NOx ...


    By Inderscience Publishers

  • Computational modelling of NOx removal by selective non-catalytic reduction

    This paper presents the results of computational kinetic modelling of the removal of nitrogen oxides (NOx) from flue gases by selective non-catalytic reduction (SNCR) process using urea as a reducing agent. CHEMKIN and SENKIN computer codes were used with latest reaction mechanism parameters for simulated conditions in an isothermal plug flow reactor. Flue gas initial conditions were simulated as ...


    By Inderscience Publishers

  • A novel approach for modelling of NOx emission reduction in a tangentially fired coal boiler

    In this research paper, predictive modelling of NOx emission of a 210 MW capacity pulverised coal–fired boiler and combustion parameter optimisation to reduce NOx emission in flue gas is proposed. The effects of oxygen concentration in flue gas, coal properties, coal flow, boiler load, air distribution scheme, flue gas outlet temperature and nozzle tilt were studied. The data collected from ...


    By Inderscience Publishers

  • Hourly NOx concentrations and wind direction in the vicinity of a street intersection

    This study relates NOxconcentrations and wind (speed and direction) measured inside an asymmetric street canyon, with ambient wind. The monitoring site is located near a street intersection. The wind measured at the domestic airport located in the city, near the coast, has been considered as ambient wind. Wind direction at the monitoring site inside the canyon is mainly from the E, NE, W and NW ...


    By Inderscience Publishers

  • Canarina DISPER software · NOx air dispersion · algorithms 15

      Canarina DISPER software · NOx air dispersion  Procedures Used to Account for Buoyancy-Induced Dispersion. The method of Pasquill is used to account for the initial dispersion of plumes. With this method, the effective vertical dispersion ...

  • Pollution monitoring in Cement Industry

    The rising use of waste based fuels in the cement industry, both for economic and Environmental objectives, combined with the strengthening of air emission regulations around the world is pushing many operators to face a wider list of pollutants to monitor this, with associated costs. The design of appropriate solutions meeting local regulation is the key to maximize the cost benefit of the fuel ...


    By Environnement S.A

  • Intelligent Pollution Control

    The world faces difficult pollution control decisions. For every dollar spent on pollution control, there is an alternative investment in health improvement. For every dollar spent on reducing one pollutant, there is an alternative to reduce another. The most prudent course to make the best investment should include: Intelligent uncertainty Intelligent classification of options ...


    By The McIlvaine Company

  • NOx in Non-Utility Industries - Part I NOx in Non-Utility Industries - Part I - Air emission origins, best control solutions and monitoring methodology for nitrogen oxides

     Problems with reducing nitrogen oxides (NOx) are widespread in the general process industries. These industries, together with medium size utility and power generators contribute about 15 percent of global NOx emissions. The emission sources addressed include various heaters employed in chemical and petrochemical plants, nitric and sulfuric acid plants, glass furnaces, iron and steel mills, ...


  • A method to extend flamelet manifolds for prediction of NOx and long time scale species with tabulated chemistry

    Numerical simulation is currently used to help design low NOx devices for aircraft engines. In order to improve the prediction of pollutant species, combustion models based on tabulated chemistry have been commonly used in recent years. However, the short time scales of usual flamelet manifolds can lead to errors concerning the NO prediction in post flame area, as shown in this paper. Thus, a new ...


    By Inderscience Publishers

  • Controlling Air Pollutants case study

    While it's not always easy to determine what's required for compliance, new technologies can help achieve air-pollution control Selecting air-pollution control equipment can be tricky. It's not only difficult to determine which pollutants must be controlled, but also which type of equipment will best control them to required levels for any given process or facility because there is no ...


    By Bionomic Industries Inc.

  • Comparison of measured and modelled NO2 values at Zurich airport, sensitivity of aircraft NOx emissions inventory and NO2 dispersion parameters

    This paper presents a comparison of modelled and measured annual mean NO2 concentrations around Zurich airport. Modelled concentrations were derived from the LASAT Lagrangian model for the airport and from a Gaussian plume model for the Zurich canton. The measured annual mean NO2 concentrations were monitored at stations within the airport. The modelled airport NO2 concentrations fell below 1 ...


    By Inderscience Publishers

  • Relation between ozone levels and NOx and VOC emissions in the Sao Paulo Metropolitan Area for an episode of August, 1998

    At present, major efforts in air pollution control for urban areas are oriented to reduce ozone levels to below standards. Models are a useful tool for air quality assessment and they can help to select the best strategy plan to reduce ozone levels in a polluted area. Like other large cities in the world, Sao Paulo Metropolitan Area (SPMA) has registered high levels of ozone and particulate ...


    By Inderscience Publishers

  • A selective catalytic system for greenhouse gas (NOx) emission reduction at a 2–ethyl hexanol plant

    Trends of ambient NOX levels in the Jubail Industrial City, Saudi Arabia, are increasing, and the regulators have identified areas requiring substantial reductions to control the atmospheric NOX concentrations. In this study, a Selective Catalytic Reduction (SCR) system for the control of NOX ...


    By Inderscience Publishers

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