water and air pollution

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  • 8/6/2019 Water and Air Pollution


    Air Pollution Control

    Air Quality Monitoring443

    Climate Change Mitigation292

    Dust & Fume Extraction262

    Particulate Scrubbers164

    Electrostatic Precipitators74

    Air Filtration410

    Gas Cleaning275

    Vapour Recovery123

    Odour Control350

    General Air Purification & Misc.193

    Control Air PollutionS h y a m a l G h o s h

    HomeArticlesTechnical SupportAchievementsContactUseful LinksTop of Form

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    Is it possible to haveCLEAN AIRin Industries?

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    Many industries are not able to use the Air PollutionControl plants properly due to deficiency inequipment/system design. Some industries also lack inproper operation and maintenance practice. With properknow-how it is possible to improve the performance of the

    existing Air Pollution Control Plants through minormodifications of the equipment/system and operatingthem properly.

    Shyamal Ghosh is in the field ofAir Pollution Control Technology since1977 through large multi-national organizations, out of which for 17 years hewas with Flakt India Limited. System design, marketing and execution ofmany milestone projects in INDIA, JAPAN, RUSSIA, EGYPT, THAILAND,MALAYSIA, VIETNAM, BANGLADESH and UAE are to his credit. Click here forsome clippings.

    "And I am confident that it is possible to have clean air in and around the

    industries. I have proved it and am ready to prove it over and over again!"


    His expertise in the field of Air Pollution Control Technology:-

    Design of New Systems

    Modification of old systems for better performance.

    Design of improvised systems for critical dusts and for criticalapplications.

    Check and control design parameters of the Original EquipmentManufacturers.

    Guidance/Workshops for proper operations & maintenance to achievethe best possible stable performance.

    Shyamal's activities at present:

    At present he is attached to various industrial giants of India, Middle-east,Malaysia, Thailand and Singapore. Many successful performanceimprovement projects have already been carried out by him in India and theneighboring countries.

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    Shyamals experience have been utilised by various steel industries of India,which are going for large-scale expansions. He is assisting the Industries inthe implementation of improved technology for the dust & fume extractionsystems being supplied by Indian as well as overseas suppliers. He is alsoworking for many Industries in India and in overseas countries for the

    performance improvement of their age-old plants as well as design andinstallation of some new plants.

    Through his close associations with some organizations in India and abroadhe could prove not by words, but by actions that A LITTLE AWARENESS ANDINTEREST CAN MAKE THE AIR POLLUTION CONTROL SYSTEMS A REALITY ANDNOT JUST EYEWASH.

    He is also working on the assessment of the requirement of Bag Filter vis--vis ESP at the Thermal Power Plants because of the deterioration of coalquality with increase in ash content (ranging from 35 to 55%).

    Shyamal conducts workshops and conferences to enrich knowledge of theengineers, operators and also students. Presentations & Workshops carriedout by him are mainly on the following subjects:

    Presentations on:

    Air Pollution Control,

    Industrial Air Pollution Control for Sustainable Economic Development &Growth,

    Control of Carbon dioxide Present world scenario,

    Environment friendly heritage A path towards restoration of cosmic

    harmony & control of global warming.Workshops on Air Pollution Control Systems with:

    Bag Filter,

    Electrostatic Precipitator,

    Dynamic Collector,

    Wet Collector.

    Click for more on Workshops and Conferences.


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    May 1997


    By: Gary M. Hutter, Ph.D

    With the passage of the 1971 Clean Air Act, American industry experienced a

    significantly increased need to reduce air pollution. The application of existingand new technology resulted in the development of many air pollution controldevices. They included:



    Catalytic reactors


    Electrostatic Precipitators


    Absorption equipment & wet scrubbers

    In the last two dozen intervening years, much of this equipment has reachedthe end of its useful life, the original process parameters have changedrendering this equipment less effective, and historical failure modes andequipment limitations have been identified.

    The major controlling performance parameters are:

    Particle size, weight, shape

    Particle velocity

    Gas temperature / density

    Solubility and pH

    System pressure drop and mass

    transfer conditions

    Particle size distribution

    Gas viscosity

    Humidity level

    Chemical stoichiometry

    Residence time

    The following is a short primer on these devices, some of the effects of theircontrolling parameters, and their limitations, advantages, and operatingproblems.

    1. CYCLONESCyclones operate to collect relatively large size particulate matter from a

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    gaseous stream through the use of centrifugal forces. Dust laden gas is madeto rotate in a decreasing diameter pathway forcing solids to the outer edge ofthe gas stream for deposition into the bottom of the cyclone. Efficiencies of90% in particle sizes of 10 microns or greater are possible.

    Performance & CollectionEfficiency

    Linear increases with: particledensity, gas stream velocity,and rotational passes

    Linear decrease with fluidviscosity

    Exponential increase withparticle diameter

    Limitations / Advantages /Problems

    Reduces internal access needs

    Optimal flow rate difficult toadjust

    Prone to internal erosion / corrosion

    Operation at elevated temperatures possible

    Low efficiency for small diameter material

    Hopper recirculation / flow distribution problems High energy costs for volumetric flow requirements

    Dew point agglomeration, bridging, and plugging

    Few moving parts, few mechanical / electrical ignition sources

    2. INCINERATORSIncineration involves the high efficiency combustion of certain solid, liquid, orgaseous wastes. The reactions may be self sustaining based on the

    combustibility of the waste or require the addition of fuels. They may be batchoperations or continuous as with flares used to burn off methane from landfills;and, they may incorporate secondary