exhaust diluter Articles

  • Effects of trees on the dilution of vehicle exhaust emissions in urban street canyons

    In order to investigate the natural ventilation and air quality of urban street canyons with trees, boundary layer wind tunnel studies at a small-scale model have been performed. Concentrations in street canyons with a tracer gas emitting line source at the ground level and one row of trees arranged along the canyon centre have been measured for several equidistant tree spacings. In the case of ...


    By Inderscience Publishers

  • Time-resolved ammonia measurement in vehicle exhaust

    The objective of this study was to identify the influence of sampling and analytical approach on the quality of NH3 emission data of a gasoline-fuelled three-way catalyst vehicle. NH3 concentration measurements have been performed in the tailpipe and in the diluted exhaust after a constant volume sampling (CVS) system during five different test cycles. Chemical ionisation mass spectrometry ...


    By Inderscience Publishers

  • Total Exhaust Biosafety Cabinet Upgrade at Research Facility Provides Significant Energy Savings

    When Harvard’s Biology Research Infrastructure (BRI) facility opened in 2006, they required four biological safety cabinets to provide primary containment during animal procedures. In the selection process, workspace containment and isolation requirements, operation modes for non-use periods and maintenance, building integration, and the energy burden to the building system were all ...


    By The Baker Company

  • Ammonia Scrubbing Semiconductor Manufacturing 101

    Semiconductor chip manufacturing utilizes a variety of inorganic acids and ammonia solutions. Mixing of acid gases and ammonia in a ventilation system can result in a as phase reaction producing very fine particulate that is ifficult and expensive to remove. For this reason a large emiconductor foundry on the west coast decided topre-treat the exhaust from the ammonia sources prior o mixing with ...

  • An evaluation of the residual toxicity and chemistry of a sodium hydroxide‐based ballast water treatment system for freshwater ships

    Non‐native organisms in the ballast water (BW) of freshwater ships must be killed to prevent the spread of invasive species. The ideal BW treatment system (BWTS) would kill 100% of BW organisms with minimal residual toxicity to organisms in receiving waters. The residual toxicity and chemistry of a BWTS was evaluated: sodium hydroxide was added to elevate pH to > 11.5 to kill BW organisms, ...


    By John Wiley & Sons, Ltd.

  • Breakthroughs in testing technology as new global player emerges

    Engineers and developers now have a choice of engine testing technologies following the recognition by the United States Federal Register of the BG3 Partial Flow Dilution sampling (PFD) technology developed by Sierra Instruments for engine particulate emissions, R&D and certification. Building on this news, the Monterey, California - based company has also extended its global footprint this ...


    By Sierra Instruments, Inc.

  • Capturing Organic Vapors from Non-Condensable Gases Using Activated Carbon Adsorption Technology

     There are many established uses of vapor phase carbon adsorption technology in the chemical industry. The majority are to capture organic vapors from non-condensable gas streams, such as process exhausts. Other applications include process gas separations such as the removal of oxygen from air in the production of nitrogen. This article focuses on the capture of organic vapors from ...


    By AMCEC Inc.

  • Poisoned at the Arena

    Canadians love their hockey. With that in mind, a reasonably sized community will have an ice rink. Global Maritimes states in a news article that “there are 10 times as many rinks in Canada as there are in the United States.” That means more ice resurfacers, also known as zambonis, and ice edgers can be found in Canada than the USA. An ice resurfacer is a machine that is used to ...

  • Controlling Pharmaceutical Coating & Drying Process Emissions

    Capturing and destroying harmful emissions from pharmaceutical processes can be challenging. It’s not because the volatile organic compounds (VOCs) are difficult to destroy using catalytic or thermal techniques. It’s because their concentrations can be so high. These process streams raise safety concerns, both when they’re collected in vents and when they reach the final ...

  • Comparing TGA, FTIR and fixed filter infrared analyzers for measuring soot levels in in-service lubricants

    Measuring soot in diesel engine oil has become more important as soot levels get higher due to exhaust gas recirculation. As soot isone of the key indicators for the condition of the oil, diesel engine maintenance programs performing regular soot checks can realize cost savings by extending drain periods and reducing used oil disposal. TGA (Thermal Gravimetric Analysis) is the traditional method ...


    By Spectro Scientific

  • Product Spotlight: Regenerative Thermal Oxidizer - Case study

    Oxidizer case histories in the pharmaceutical industry The pharmaceutical industry faces unique challenges in complying with environmental pollution and emission control regulations. Three pharmaceutical process case studies are examined: fluidized bed drying, tablet coating and reaction vessels, and batch operations. Recently, a contract drug manufacturing company faced violation ...

  • Case study - Batch chemical manufacturing

    Location: New Jersey Equipment: Refurbished, warranted Regenerative thermal oxidizer RTO; (10,000 scfm) (1994 vintage) Installed: 2002 Problem: Batch chemical manufacturer required emission controls as part of a process expansion in their New Jersey facility. Project Details: ...


    By Kono Kogs, Inc.

  • What is a Breathing or Respiratory Zone?

    In the past, vehicle exhaust gas detectors have been installed on or near the ceiling. In contrary, Critical Environment Technologies Canada Inc. (CETCI) has always recommended that they be installed in the breathing zone. Recently, Quebec’s regulation has reinforced CETCI’s recommendations. It states that “dusts, gases, fumes, vapours and mists found in the workplace ...

  • Alternatives to Chlorine for Cleaning Cooling Towers

    Untitled Document Summary The new amendments to ASHRAE Standard 62-2001, Ventilation for Acceptable Indoor Air ...


    By Dolphin WaterCare

  • Low-mass PM analyzer MEXA-1370PM — Improvement of the Performance for PM Composition Analysis —

    Particulate matter (PM) emitted from engines is currently measured by the filter weight method. The filter weight method passes diluted emission gases through a filter collecting the PM, and post test weighs the mass of the collected PM on a precision balance. However, this method is time consuming, and with decreasing PM emission volumes, improvements in accuracy were needed. So the MEXA-1370PM ...


    By HORIBA Europe GmbH

  • Case study - Destruction of inert process emissions

    Many chemical companies use batch reactors to make their products.  These reactors typically have vents which are opened and closed during emptying, filling, mixing, heating or cooling and other steps of the production process.  The gases coming from these vents must be controlled under most government regulations.  Generally speaking, the emissions produced are inert (little or no ...

  • Case study - Reactor vent emission control

    OVERVIEW Many chemical and petroleum companies use batch reactors to make their products.  These reactors typically have vents which are opened and closed during emptying, filling, mixing, heating or cooling and other steps of the production process.  The gases coming from these vents must be controlled under most government regulations.  Generally speaking, the ...

  • The Hazards of Being in a Beauty Salon

    There are many health risks associated with the beauty industry due to the chemicals found in the products. We are all affected by these chemicals every time we go to the beauty salon. Many of the products found in these salons are classified as hazardous and extreme caution should be taken into consideration when using these products. They’re made for professional use only; therefore, ...

  • Clearing the air: the use of bio-oxidation for industrial air emissions control

    The wood products industry began rather ardous road to emissions control in the early 1990s with the first installation of a thermal oxidizer (an RTO) at a California MDF facility, for volatile organic compound (VOC) control. During the ensuing years, virtually every panel board facility has had to control emissions of VOCs, and up until the last few years, always with some sort of thermal ...


  • Portable IR Analyzer Provides ASTM Field Test Method for Measuring Soot Levels In Diesel Engine Lubricating Oils

    The InfraCal Soot Meter, from Wilks Enterprise, gives users an approved ASTM testing method for measuring the percent level of soot in diesel engine lubricating oils -- ASTM Method D7686-2011 entitled “Test Method for Field-Based Condition Monitoring of Soot in In-Service Lubricants Using a Fixed-Filter Infrared (IR) instrument.” While there is widespread disagreement on used-diesel ...


    By Spectro Scientific

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