SUBCHAPTER B: MOTOR VEHICLE ANTI-TAMPERING
6 mars 2014 Maintenance and Operation of Air Pollution Control Systems or. Devices Used to Control Emissions from Motor Vehicles. (a) Any person owning or ...
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APDG 6110v2 01/2011 Air Pollution Control of devices systems
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14 juil. 2000 For example particulate (solid) matter pollutants are controlled by different techniques and equipment than gaseous pollutants. Also
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collecting pollutants using air pollution control systems before they reach the atmosphere. The most commonly used devices for controlling particulate
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Table 23 Design guidelines for air pollution control systems Exhaust system comprises of five elements as illustrated below:.
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2 mai 2011 See Appendix C for a list of acceptable control systems or devices. G. Glycol Dehydrators. Glycol usually tri-ethylene glycol (TEG)
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Air Pollutant Capture Evacuation Systems. Hoods enclosures
TM 5-815-1 Air Pollution Control Systems for Boilers and Incinerators
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Jan 11 1999 · Air Pollution Control Technology Fact Sheet EPA-CICA Fact Sheet Fabric Filter 1 Cartridge Collector Type Name of Technology: Paper/Nonwoven Filters - Cartridge Collector Type with Pulse-Jet Cleaning (also referred to as Extended Media) Type of Technology: Control Device - Capture/Disposal
Fact Sheet: Air Pollution Emission Control Devices for Stationary Sources
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Module 6: Air Pollutants and Control Techniques - NRC
Spray tower scrubbers include these design types: (1) open (2) cyclonic and (3) baffled spray towers The scrubber categories listed above comprise more than fifty different types of scrubbers in common commercial use Scrubbers are by far the most diverse group of air pollution control devices used for particulate control Wet Scrubbing Systems
Air Pollution Control Technology Fact Sheet - US EPA
This type of technology is a part of the group of air pollu tion controls collectively referred to as “wet scrubbers ” When used to control inorganic gases they may also be referred to as “acid gas scrubbers ” Type of Technology: Removal of air pollutants by inertial or diffusional impaction reaction with a sorbent
Air Pollution Control Technology Fact Sheet - US EPA
Air Pollution Control Technology Fact Sheet EPA-CICA Fact Sheet Flare1 Name of Technology: Flare This includes elevated flares steam-assisted flares air-assisted flares non-assisted flares pressure- assisted flares and enclosed ground flares Type of Technology:Destruction by thermal oxidation
Air Pollution Control Technology Fact Sheet - US EPA
Air Pollution Control Technology Fact Sheet EPA-CICA Fact Sheet 1 SCR Name of Technology: Selective Catalytic Reduction (SCR) Type of Technology: Control Device - Chemical reduction via a reducing agent and a catalyst Applicable Pollutants: Nitrogen Oxides (NOx)
How are air pollution emissions controlled?
- These emissions are typically controlled to high efficiencies using a wide range of air pollution control devices. The selection of the appropriate control technology is determined by the pollutant collected, the stationary source conditions, and the control efficiency required.
What devices are used to control particulate emissions?
- The most commonly used devices for controlling particulate emissions include: • electrostatic precipitators (wet and dry types), • fabric filters (also called bag houses), • wet scrubbers, and • cyclones (or multiclones).
What Wet collection devices are used for PM control?
- Wet collection devices used for PM control include venturi scrubbers, bubbling scrubbers, spray towers, and in some instances, wet electrostatic precipitators (ESPs).
What are the sources of air pollution?
- Stationary sources of air pollution emissions, such as power plants, steel mills, smelters, cement plants, refineries, and other industrial processes, release contaminants into the atmosphere as particulates, aerosols, vapors, or gases.
EPA/452/B-02-001
Source: tank or process 0.4x
x = 35 minimum "A" DIAMETERLONGITUDINAL GORED ELBOW
SEAM DUCT
(Solid welded longitudinal seam)DIMENSIONS:
8-inch minimum
A90-inch maximum
Diameter
STRAIGHT TEE STRAIGHT 90 CROSS
VDIMENSIONS:
1" 1"
DDIMENSIONS:
V = C + 2 V = C + 2
1" Maximum C or D = A Maximum C = A
A A 1" 1" C CDAMPERS CONCENTRIC REDUCER
(1-inch minimum orECCENTRIC REDUCER
(4-inch minimum or12-inch maximum) A - B
DIMENSIONS:
R = 1.5A
Where:
Number of gores
2
3
5For elbows where exceeds 90 ,
add one gore for each additional18 or fraction thereof.
0 - 35
36 - 71
72 - 90
A R1" 1"
a v lb ( 100 × g lb m sec = . ft air f sec125 73207 915
.W in. w.c. .hp = WSome observations about this illustration:
Recall that the precise units for (1.7) 1-17 v w a 0 u VP = 2 Or: u Incidentally, these equations apply to any duct, regardless of its shape. As Burton describes it, static gauge pressure can be thought of as the " stored" energy in a ventilation system. This stored energy is converted to the kinetic energ y of velocity and the losses of friction (which are mainly heat, vibration, and noise). Friction lo sses fall into several categories:[27] Losses through straight duct Losses through duct fittings - elbow tees, reducers, etc. Losses in branch and control device entries Losses in hoods due to turbulence, shock, vena contracta Losses in fans Losses in stacks These losses will be discussed in later sections of this chapter. Generally speaking, much more of the static gauge pressure energy is lost to` friction than is co nverted to velocity pressure energy. It is customary to express these friction losses (? = kVP 1-19 2 Q = u c d 4 Similarly, if a flange were installed around the outside of the duct end, the sur face area through which the air was drawn - and the volume flow rate - would be cut in half. That occurs because the flange would, in effect, block the flow of air from points b ehind it. Hence: From these examples, it should be clear that the hood shape has a direct bearing on the gas flow rate drawn into it. But Equations 1.16 to 1.18 apply only to ho ods with spherical flow patterns. For other hoods, other flow patterns apply - cylindrical, pla nal, etc. We can generalize this relationship between volumetric flow rate and hood design parameter s as follows: x ShHood Type
of Entry ()Duct end (round) = 4
2 0.93 = 2 x 2 0.50 = 2 x 1.78 = 0.5 1.78 = 2 0.06 1 = u f 0.25 = 1.4 0.25 = 1.4 1.0 = 125 1.78 = 100 0.25 = flow rate drawn into hood (ft = distance from hood to source (ft) = hood capture velocity (ft/min) = hood face velocity (ft/min) = hood slot velocity (ft/min) = hood vace area (ft = width of hood slot (ft) = tank + drainboard surface area (ft = booth cross-sectional area (ft u u vp -vp + = -F 1 2 g (1.21) 1 21 where + k c = = .in. w.c. VP . 1/2Operation/Hood Type
Tanks, degreasing
Drying oven
Spray booth
Canopy hood
Grinding, abrasive blasting
Slot hood
14 (1.24) whereQ = ftft
n (.][ ].ft ,ft u = = = .min 2 where A 1/2Material(s) Conveyed Minimum Transport Velocity (
t, ft/min)Gases: very fine, light dusts 2,000
Fine, dry dusts and powders 3,000
Average industrial dusts 3,500
Coarse dusts 4,000-4,500
Heavy or moist dust loading
Material
Aluminum dust (coarse)
Nominal Thickness (inches)
Galv 1 ( -1) (1.28) 1.18 1.8Material
Non-spiral-wound galvanized
Fiberglass (smooth finish)
ABS and PVC plastic
Concrete
Corrugated flex duct
Radius of Curvature
0.50 1.00 1.25 1.50 2.00 2.50 1/2 15 D .ft1.18 1.8
.in. w.c. P where 1/2 u c1.3.4.2 Calculating Stack Height
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