quality - dust control
TRANSCRIPT
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DUST CONTROLDUST CONTROL
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DUSTDUST Dust is a very fine particle size (submicron) thatDust is a very fine particle size (submicron) that
easy to airborne.easy to airborne. The National Ambient Air Quality StandardThe National Ambient Air Quality Standard
(NAAQS) have targeted PM 10 ((NAAQS) have targeted PM 10 (-- 10 micron10 micron
particulate) because these very fine particleparticulate) because these very fine particlerepresent the most serious health hazardrepresent the most serious health hazard
Process and Fugitive Dust are regulatedProcess and Fugitive Dust are regulated
pollutants.pollutants. The creation of Dust in industry is an unavoidableThe creation of Dust in industry is an unavoidable
results of operation, such as; Dumping, Crushing,results of operation, such as; Dumping, Crushing,
screening, conveying, discharging etc.screening, conveying, discharging etc.
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DUST IN COAL MININGDUST IN COAL MINING
INDUSTRYINDUSTRY
MINING PROCESS
COAL HANDLING CHAINCOAL HANDLING CHAIN
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COAL HANDLING CHAINCOAL HANDLING CHAIN
CRUSHER
(Cap.
Feeder Cap. 500 TPHCap. 500 TPH
TRANSHIPMENT POINT - GEAR VESSEL
CUSTOMER
(1 ,2 5 0 TPH)
C a p .50 0
TPH
Ca p .
500 TPH
RADIAL CONVEYOR
RADIAL CONVEYOR
LATI MINE
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COAL HANDLINGCOAL HANDLING
CHAINCHAIN
MiningMining -- ChargingCharging -- HaulingHauling DumpingDumping
CrushingCrushing StockpilingStockpiling BargingBarging --
TransshipmentsTransshipments
These Operation could be generate fineThese Operation could be generate finecoal, resulting Dust emission.coal, resulting Dust emission.
The longer handling chain, the more proneThe longer handling chain, the more prone
to generate of fine coal (dust).to generate of fine coal (dust).
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FACTORS OF COAL DUSTFACTORS OF COAL DUSTOCCURSOCCURS
COAL PROPERTIESCOAL PROPERTIES
HANDLING SYSTEMSHANDLING SYSTEMS
WEATHER / SEASONWEATHER / SEASON
ACCESS OF WIND AND WIND SPEEDACCESS OF WIND AND WIND SPEED
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HOW TO CONTROLHOW TO CONTROL
DUSTDUST
Minimizing coal handlingMinimizing coal handling
Use a proper equipments forUse a proper equipments for
handlinghandling
Suppress Dust occurs duringSuppress Dust occurs during
operationoperation
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DUST SUPPRESSANTDUST SUPPRESSANT Dry collection systemsDry collection systems
are very efficient, however, this technology isare very efficient, however, this technology iscapital intensive, high maintenance, andcapital intensive, high maintenance, andapplicable only to sources that can be enclosed.applicable only to sources that can be enclosed.
Water Spray systemWater Spray systemremains the most efficient and cost effectiveremains the most efficient and cost effective
means of dust control for both process andmeans of dust control for both process andfugitive dustfugitive dust
Chemical AgentChemical Agent
Have wide spread used in industries toHave wide spread used in industries tosuppress dust problemsuppress dust problem
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WATER SPRAYWATER SPRAY
SYSTEMSYSTEM The affectivity of water spray systems are relied on theThe affectivity of water spray systems are relied on the
nozzle used to spray water.nozzle used to spray water. There are several types of nozzle available which resultsThere are several types of nozzle available which resultsdifferent type of water sprays.different type of water sprays. VV--nozzlenozzle
Full cone nozzleFull cone nozzle
Fogger nozzleFogger nozzle
The efficiency of the water spray system has establishedThe efficiency of the water spray system has establishedthe following facts :the following facts : For a given spray nozzle, the collection efficiency for small duFor a given spray nozzle, the collection efficiency for small dustst
particle increases as the pressure increasesparticle increases as the pressure increases At a given pressure, the efficiency increases as the nozzle desiAt a given pressure, the efficiency increases as the nozzle design isgn is
changed so as to produce smaller droplets. Thus the smallerchanged so as to produce smaller droplets. Thus the smallerdroplet is more effective in knocking the small dust particle oudroplet is more effective in knocking the small dust particle out oft ofthe air.the air.
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The AerodynamicThe Aerodynamic
of water droplet and small dustof water droplet and small dust
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WATER SPRAYSWATER SPRAYS
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ULTRASONIC DUSTULTRASONIC DUST
SUPPRESSANT SYSTEMSUPPRESSANT SYSTEM
The system use water and compressed air to produceThe system use water and compressed air to produce
micron size droplet that are able to suppress respirablemicron size droplet that are able to suppress respirabledust without adding any detectable moisture to thedust without adding any detectable moisture to theprocess.process.
Generally the system consist of two main part. These areGenerally the system consist of two main part. These are
as follows :as follows : Air compressor unitAir compressor unit
Spray headers with pipelines and pumping systemSpray headers with pipelines and pumping system
The Ultrasonic Atomizing system generates dropletsThe Ultrasonic Atomizing system generates droplets
averaging 10 micron in size and is capable of suppressingaveraging 10 micron in size and is capable of suppressingsubsub--micron dust particles. (conventional spray systemmicron dust particles. (conventional spray systemgenerate droplets in average of 600 micron)generate droplets in average of 600 micron)
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NOZZLE DESIGNNOZZLE DESIGN
The Ultrasonic Atomizing Nozzle takes theThe Ultrasonic Atomizing Nozzle takes the
form of a whistle using compressed airform of a whistle using compressed airwhich accelerates through a convergewhich accelerates through a convergesection and expand to a diverge section intosection and expand to a diverge section into
a resonator chamber. This produce aa resonator chamber. This produce apowerful sonic shockwave.powerful sonic shockwave.
Droplets produced by sonic atomization areDroplets produced by sonic atomization are
small and relatively uniform in size, in thesmall and relatively uniform in size, in theorder of 10 micron, with a low mass and loworder of 10 micron, with a low mass and lowforward velocity.forward velocity.
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ARCH
FOGGER
SYSTEM
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CHEMICAL AGENTCHEMICAL AGENT
The usage of chemical agents have widely spreadThe usage of chemical agents have widely spread
in many industries to suppress dust problemin many industries to suppress dust problem
These chemical agent generally consist of polymerThese chemical agent generally consist of polymer
as a binder agent and surfactant to reduce surfaceas a binder agent and surfactant to reduce surface
tension between water and coaltension between water and coal
In General the type of chemical agent are fall intoIn General the type of chemical agent are fall into
two types, i.e.two types, i.e.
Wetting typeWetting type
Coating typeCoating type
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SURFACTANTSURFACTANT
Coal Surface
Surfactant
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POLYMER EMULSIONPOLYMER EMULSION
The polymer emulsion is a fine particle binder, andThe polymer emulsion is a fine particle binder, and
forms a coating layer on the coal surfaceforms a coating layer on the coal surface
Polymer Particle Moisture evaporation Polymer resin
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END OF PRESENTATIONEND OF PRESENTATION