Fundamentals of Waste Incineration - ECO Canada...incinerator. They have different vapour pressures....
Transcript of Fundamentals of Waste Incineration - ECO Canada...incinerator. They have different vapour pressures....
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Ketek Group Inc.
Fundamentals of Waste
Incineration
Albert J. Liem, Ph.D., P.Eng.
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Objectives Better awareness of waste incineration technology
- Fundamentals of waste properties and physical/chemical processes that are relevant to waste incineration
- Selected examples of the practice of incineration
Good starting point to learn more about waste incineration
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The Overall Process: Thermal Oxidation
Exothermic - High temperature as hot gas
and hot ash
- Self-sustaining once started
Different processes with same principle
- Forest fires
- Combustion engines
- ….
Waste management overall strategy has been considered
Thermal Oxidation
Material
Oxygen
Hot Gas
Ash
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Scope: Waste Incineration
Waste
- No value or negative value
- Auxiliary fuel may be needed
Similar processes with different “economics”
- Power plants
- Energy recovery systems
- ….
Waste Incineration
(WI)
Flue Gas
Ash
Aux Fuel
Waste
Air
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Rationale for Waste Incineration
Detoxification or sterilization
- High Temperature
Reduction in disposal requirement
- Ash < Waste
Energy and/or material recovery
Reduction in wildlife interactions
- No edible left
WI
Flue Gas
Ash Air
Waste
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Exclusion #1: No Pre/Post-Incineration Processes
Scrubber - Air pollution control
device (APCD)
- Cleans air emissions
Ash Treatment - Prevents leaching of
contaminants when landfilled
- Makes it safe for use
Waste “Pre-treatment” - Form changes
- Compaction
- Segregation
WI
Flue Gas
Ash
Scrubber
Treatment
“Pre-treatment”
Air
Waste
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Exclusion #2: “Analyses” and Environmental Regulations
Sampling and analysis
- Waste
- Flue gas
- Ash
Environmental regulations will be cited ONLY as examples
Variations
- Jurisdictions
- System Size
- Applications
WI
Flue Gas
Ash
Scrubber
Treatment
?
? Air
Waste ?
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Exclusion #3: Not about different designs
Different types and designs are shown ONLY as examples
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Webinar Outline
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate” compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on waste
properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
WI
Flue Gas
Ash Air
Waste
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Physical state and combustion modes
WI
Flue Gas
Ash
http://www.chem.purdue.edu/gchelp/atoms/states.html
http://www.chem.purdue.edu/gchelp/atoms/states.html
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
Air
Waste
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Gas-phase combustion
Waste gas and oxygen molecules “collide” and react in a gas-phase reaction
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Liquid Incineration
Use a nozzle: liquid is atomized → droplets evaporate → gas-phase combustion
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Char (FC) Burning
Ash
Solid Incineration
Volatiles, Soot …
Solid Waste
(De)Volatilization Drying
Char
HEAT
FC: Fixed Carbon
Evaporation
Solid
Melting
Liquid
Vapour
Gas-phase Combustion
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Solid Suspension Combustion
Ash
FLY
BOTTOM
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Particulate Matter in Flue Gas (1)
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
Fly
ash
or
PM
Air
Waste
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Proximate Composition (1)
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
Non-combustible
Combustible
Water
Fly
ash
or
PM
Air
Waste
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Recall Solid Waste Combustion
Char (FC) Burning
Ash
Volatiles, Soot …
Solid Waste
(De)Volatilization Drying
Char
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Proximate Composition (2) for Solids
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
Non-combustible
Combustible
Water
Fly
ash
or
PM
Volatile
Fixed Carbon
Air
Waste
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Examples
Version Slide 19
02 September 2015
0
10
20
30
40
50
60
70
80
90
100
Coal (bit) Wood Paper Sewagesludge
MSW Plastics PVC
Ash Fixed Carbon Volatile Moisture
http://users.tkk.fi/~rzevenho/BR_ch2.pdf
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PM Emission from Bulk Solid Incineration
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate” compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on waste
properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
Fly
ash
or
PM
Air
Waste
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Source: carry-over of PM to the Stack
Complex factors: waste form + air flow rate + “geometry” +“flow pattern”
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Strategy #1: Minimize air flow (Dual
Chamber, Starved Air)
FC Burning
Volatiles, Soot …
Volatilization Drying
Char
Excess Air
For
Gas-phase
Combustion
Air flow in contact with waste is less than total air flow for combustion
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Primary Chamber Primary Chamber
Strategy #2: Minimize disturbance (Batch Operation)
Version Slide 23 02
Septem
ber
2015
Secondary Chamber
Flameport
Secondary Chamber
Secondary Chamber
Environment Canada recommends Batch Operation for Small-Scale Solid Waste Incinerator
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Strategy #3: Modify waste form
Wood Logs Wood Pellets
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Results from Stategy #3
http://www.canbio.ca/upload/documents/pelletinfonote7.pdf
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“Complexity”: Results from Strategies #1 and 2
Regulatory Limits for PM: 17 – 50 mg/Rm3
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Stoichiometry
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Non-combustible
Combustible
Water
C, H + O2
CO2
H2O →
Heat
Air
Waste
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Example and Definitions Diesel combustion stoichiometry
- 14.7 kg air/kg diesel
- 11.3 m3 air/L diesel
Definitions
- Incineration: Air > Stoichiometric Requirement (SR)
- In actual operation excess air is used to ensure complete combustion
- Gasification”: Air < SR
- Exothermic process generating combustible gases (and soot)
- Pyrolysis: Air = 0
- Endothermic (External heat required) producing many products
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Examples of “good” waste (C,H,O)
- Hydrocarbons: CxHy
- Methane (CH4), Diesel* (C12H23) …..
- Plastics **: (CxHy)n polymer
- Polyethylene (C2H4), Polypropylene (C3H6), Polystyrene (C8H8) …..
- Fatty acids: CxHyCOOH
- Cellulose: (C6H10O5)n
- Wood ***: CH1.44O0.63
- ….. others
* Diesel is Not a single compound, but a mixture, ranging from C10H20 to C15H28
** Not PVC (Polyvinyl chloride)
*** Wood also contains nitrogen (~ 1%) and ash (~ 1%)
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Sources of “acid gases”
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Non-combustible
Combustible
Water
O2
SO2, NOx
HCl →
S, N, Cl
H2O +
Air
Waste
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Sulphur and chlorine-containing materials
Vulcanized Rubber
S ~ 1.6%
PVC (Polyvinyl chloride)
Cl ~ 57%
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Nitrogen-containing materials
http://www.mhhe.com/biosci/esp/2001_gbio/folder_structure/an/m9/s2/index.htm
Compound N-content
Protein 16%
Ammonia 87%
Urea 47%
Uric acid 33%
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Quantitative Relationships
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Mass and Heat Balances S SO2
Air
Waste
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Examples in Canada
Pollutant Limit, mg/Rm3 @ 11% O2
Hydrochloric acid (HCl) 17 - 75
Sulphur dioxide (SO2) 56 - 260
Nitrogen Oxides (NOx ) 110 - 400
HCl 17 Cl 20 35 g PVC or 0.035% wt
SO2 56 S 61 3.8 kg vulcanized rubber or 3.8% wt
NOx 110 N 91 Note: Burner contribution is significant* Dry, 25 C, 101.3 kPa, 11% O2, NOx as NO2
** Type 3 (M=70%, A=5%,HHV = 17 MJ/kg DB; Diesel; 1000 C)
*** 57% Cl in PVC; 1.6% S in vulcanized rubber
Element in Waste **
Max content g/100 kg wastemg/Rm3
Reg Lim*Examples ***
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Note on Interpretation of Results
HCl 17 Cl 20 35 g PVC or 0.035% wt
SO2 56 S 61 3.8 kg vulcanized rubber or 3.8% wt
NOx 110 N 91 Note: Burner contribution is significant* Dry, 25 C, 101.3 kPa, 11% O2, NOx as NO2
** Type 3 (M=70%, A=5%,HHV = 17 MJ/kg DB; Diesel; 1000 C)
*** 57% Cl in PVC; 1.6% S in vulcanized rubber
Element in Waste **
Max content g/100 kg wastemg/Rm3
Reg Lim*Examples ***
• Keeping contents below the above values will ensure “no problem”.
• Otherwise, the actual situation is complex and uncertain since there could be alkali in the incinerator that would reduce the concentrations of acid gases
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Metal Vapours in Flue Gas
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Fly
ash
or
PM
Non-combustible
Combustible
Water
Hg, Cd, Pb …
“Vapourize”
Air
Waste
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Relevance of Vapour Pressure: Mercury and Cadmium
CCME standard = 20 ug/m3 or 0.020 mg/m3
http://www.ccme.ca/files/Resources/air/mercury/mercury_emis_std_e1.pdf
MW VP 25 C Vol Concn Mass Concn
g/mol Pa % mg/m3
H2O 18 3169 3.1% 22,972
Hg 200.6 0.25 0.00025% 20
Substance
Pamb = 101.35 kPa, T = 25 C
C VP, Pa Vol Concn Mass Concn mg/m3
300 6.5 0.0064% 293Cadmium
Regulatory limits: 14 – 200 ug/m3
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Limits on Metal Contents Based on VP
Keeping metal contents below the above value will ensure “no problem”.
Otherwise, the actual situation is complex since metallic compounds can be formed in the incinerator. They have different vapour pressures. For example CdO has a much lower vapour pressure compared to Cd.
In general it is better to lower the temperature that the waste is exposed to in the incinerator.
Hg 20 Hg 17 4-ft fluorescent bulb: 10 - 50 mg Hg ("NR") (2)
Cd 14 Cd 12 NiCd AA battery: 21 g with 18% Cd content (1)
* Dry, 25 C, 101.3 kPa, 11% O2
** Type 3 (M=70%, A=5%,HHV = 17 MJ/kg DB; Diesel; 1000 C)
(1) http://www.powerstream.com/Size.htm; https://en.wikipedia.org/wiki/Nickel%E2%80%93cadmium_battery
(2) http://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=2486B388-1 ("R": 3 - 12 mg)
Element in Waste **
Max content mg/100 kg wasteug/Rm3
Reg Lim*Examples
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Mercury-Containing Products
Product Amount of Mercury* Fluorescent light bulbs 0 - 50mg Pocket Calculator 0 - 50mg LCDs 0 - 50mg Button-cell batteries (watches) 0 - 100mg Thermostats 10mg - 1000mg Switches 10mg - 1000mg Dental amalgam 100mg to 1000mg Thermometers 0mg to 3g Older pressure gauges 3g - 10g Manometers and barometers 50g to several pounds Plumbing traps 100g to several pounds
http://www.co.thurston.wa.us/health/ehhm/mercury.html
* Purdue University and NEWMOA (Northeast Waste Management Officials' Association) Mercury in Products database.
Environment Canada also has data on quantities of mercury in various products http://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=1C68C710-1
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Metals in Ash
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Non-combustible
Combustible
Water
Hg, Cd, Pb …
Air
Waste
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Concerns with groundwater contamination
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Regulatory Test Protocol (TCLP*)
“Everything” is specified and
standardized
• Solution composition
• Sample size distribution
• Amount and ratio of solution to
sample
• Container geometry
• Mixing intensity and time
• ……
Leachate is analysed for the regulated compounds
Concentrations compared to regulatory limits
Mixing to Simulate Leaching
Filtration
“Solution”
Sample
“Simulation” of Leaching in a Landfill
Other Complications:
- Wet sample
allowed
- Organic
compounds
included, including
“volatiles”,
pesticides
- 8 metals and 32
organics
* Toxicity Characteristic Leaching Procedure
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http://contribute.alfred.edu/portals/ehs/docs/TCLPList.pdf
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Regulatory Limits
“Leachable” Concentration in
Ash (mg/kg)
100
2,000
20
100
100
4
20
100
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Limitation of Metal Content Based on TCLP
Basis, kg waste 100
Ash Content,% 10%
AA NiCd Battery, g 21
Cd Content, % 18%Max Cd Concn in Ash, mg/kg 378
Note: D29*1000*D30/(D27*D28)
Example for Cadmium
Recall: US EPA TCLP Limit is 20 mg/kg ash
Need for ash treatment cannot be ruled out
Any “convenient” quantity
Data needed
Selected items
of interest and
relevant data on
metal content (Cell D31)
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Some common products with other “heavy metals” Batteries
- Lead acid (Pb)
- Ni-Cad (Ni and Cd)
- Ni MH (Ni)
Consumer electronics
- Pb and Cd
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Ash VM FC C H N Cl S O Moist Ash Comb
Organics/Combustibles 7.7 82.6 9.6 48.6 6.8 0.94 0.69 0.22 35 32.5 5.20 62.24
Paper 6.3 83.5 10.1 43 6 0.36 0.17 0.17 43.8 24 4.79 71.14
Newspaper 5.2 83.8 11.1 43.8 5.9 0.29 0.14 0.24 44.4 23.2 3.99 72.88
Corrugated & kraft paper 2.2 85.8 12.1 46 6.4 0.28 0.14 0.22 44.8 21.2 1.73 77.15
High-grade paper 9.1 83.4 7.5 38.1 5.6 0.15 0.12 0.07 46.9 9.3 8.25 82.45
Magazines 20.4 71.8 7.9 35 5 0.05 0.07 0.08 39.4 8.6 18.65 72.85
Other paper 6.9 83.8 9.3 42.7 6.1 0.5 0.22 0.14 43.3 28.7 4.92 66.38
Yard wate 9.6 73 17.4 45 5.6 1.5 0.31 0.17 37.7 53.9 4.43 41.67
Grass clippings 9.7 75.6 14.7 43.3 5.9 2.6 0.6 0.3 37.6 63.9 3.50 32.60
Leaves 7.3 72.7 20.1 50 5.7 0.82 0.1 0.1 36 44 4.09 51.97
Other yard waste 12.5 70.5 17 40.7 5 1.3 0.26 0.1 40 50.1 6.24 43.66
Food waste 11 79 10 45.4 6.9 3.3 0.74 0.32 32.3 65.4 3.81 30.79
Plastic 5.3 93 1.3 76.3 11.5 0.26 2.4 0.2 4.4 13.3 4.60 81.76
PET bottles 1.3 95 3.6 68.5 8 0.16 0.08 0.08 21.9 3 1.26 95.64
HDPE bottles 2.4 97.4 0.2 81.6 13.6 0.1 0.18 0.2 1.9 7 2.23 90.77
Polystyrene 1.8 97.8 0.4 86.3 7.9 0.28 0.12 0.3 3.4 10.8 1.61 87.59
PVC bottles 0.6 46.2 3.2 44.2 5.9 0.26 40.1 0.89 7.6 3.2 0.58 47.82
Polyethelyne bags & film 8.8 90.1 1.1 77.4 12.9 0.1 0.09 0.12 1.8 19.1 7.12 73.78
Other plastic 4.2 94.1 1.7 72.9 11.4 0.45 5.3 0.24 5.5 10.5 3.76 85.74
Other Organics 11.3 77.8 10.9 46.2 6.1 1.9 1 0.36 33.3 27.3 8.22 64.48
Wood 2.8 83 14.1 46.7 6 0.71 0.12 0.16 43.4 14.8 2.39 82.73
Textiles/rubber/leather 6.6 84 9.4 50.3 6.4 3.3 1.8 0.33 31.3 12.4 5.78 81.82
Fines 25.3 64.7 10 37.3 5.3 1.6 0.54 0.45 29.5 41.1 14.90 44.00
Disposable diapers 4.1 87.1 8.7 48.4 7.6 0.51 0.23 0.35 38.8 66.9 1.36 31.71
Other organics 31.3 58.8 9.9 44.2 5.3 1.8 2.2 0.81 14.4 8 28.80 63.20
Inorganics/Noncombustibles 100 0 0 0 0 0 0 0 0 0 100.00 0.00
MSW 24.9 67.2 7.8 39.5 5.6 0.76 0.56 0.18 28.5 28.2 17.88 53.85
Dry Basis, % WB %
*Solid Waste, R.C.Bailie, J.W.Everett, Béla G. Lipták, David H.F.Liu, F.Mack Rugg, Michael S. Switzenbaum
Table 10.3.4*
Proximate and Ultimate Comps
© Ketek Group Inc. 47 September 2, 2015
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Let’s Take a Break
September 2, 2015 © Ketek Group Inc. 48
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Complete Combustion
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Air
Waste
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Conditions for Complete Combustion
Enough oxygen - Excess air is needed in practice
Sufficiently long time - Nothing happens “instantaneously”
Sufficiently high temperature* - Higher temperature → Faster reaction rate
Sufficient “turbulence” (mixing of waste and oxygen molecules)
- Cannot react with out “meeting”
- Higher turbulence → More collision → Faster reaction rate
* Above “ignition” temperature
3T’s of Combustion
“AND”-type of conditions
Waste Molecule
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Careful with readings and calculation results!
Version Slide
51
02 September 2015
Aux Burner
Combustion Chamber Vol: V
T O2
Total Gas Flow (F)
O2 = 10%; T = 1000 C and RT = 2 seconds , BUT …..
Waste Gas Residence Time RT = V/F
Stack Air
Some waste molecules “experience” T < 1000 C and O2 < 10% for < 2 sec
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Same Readings, Different Outcome
Version Slide
52
02 September 2015
Aux Burner T O2
O2 = 10%; T = 1000 C and RT = 2 seconds produce different results
Waste Gas
Stack
Good Mixing
Air
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Incomplete Combustion
Soot → Incomplete Combustion
No Soot Does NOT NCESSARILY Mean Complete Combustion
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Consequences of Incomplete Combustion Residual waste in flue gas and/or in ash
- Detoxification failure
- DE or DRE of POHCs*
- 𝑫 𝑹 𝑬 = 𝑰𝑵 −𝑶𝑼𝑻
𝑰𝑵× 𝟏𝟎𝟎%
Formation PICs (Products of Incomplete Combustion)
- “Intermediate” products of combustion (CO, CH4 … )
- 𝐶 +1
2 𝑂2 → 𝐶𝑂 +
1
2 𝑂2 → 𝐶𝑂2
- Newly-formed compounds
- Poly Aromatic Hydrocarbons (PAHs), Chlorobenzenes, Chlorophenols
- “Dioxins”
Non-compliance with air emission and/or ash quality standards
* * Destruction and Removal Efficiency; Principal Organic Hazardous Constituents Note: DRE > 99.9999% → 6 (six) 9’s DRE
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Ash Quality Criteria Related to Incinerator Design and Operation
TCLP on “organic compounds”
- ( a long list of 32 compounds)
Maximum “Loss on Ignition” (LOI)
Oven at T C
W1 W2
𝐿𝑂𝐼 = (𝑊1 −𝑊2)
𝑊1× 100%
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Consequences of Incomplete Combustion Residual waste in flue gas and/or in ash
- Detoxification failure
- DE or DRE of POHCs*
- 𝑫 𝑹 𝑬 = 𝑰𝑵 −𝑶𝑼𝑻
𝑰𝑵× 𝟏𝟎𝟎%
PICs (Products of Incomplete Combustion)
- “Intermediate” products of combustion (CO, CH4 … )
- 𝐶 +1
2 𝑂2 → 𝐶𝑂 +
1
2 𝑂2 → 𝐶𝑂2
- Newly-formed compounds
- Poly Aromatic Hydrocarbons (PAHs), Chlorobenzenes, Chlorophenols
- “Dioxins”
Non-compliance with air emission and/or ash quality standards
* Destruction and Removal Efficiency; Principal Organic Hazardous Constituents Note: DRE > 99.9999% → 6 (six) 9’s DRE
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“Dioxins”
Chemical names
- polychlorinated dibenzo-para-dioxins (PCDDs)
- polychlorinated dibenzofurans (PCDFs)
2,3,7,8-tetrachlorodibenzodioxin (TCDD)
Cl
H
O C
1
2
3 4 6 7
8
9
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“Dioxins”
Chemical names - polychlorinated dibenzo-para-dioxins (PCDDs) - polychlorinated dibenzofurans (PCDFs)
Family of compounds (number and positions of chlorine atoms)
- 75 congeners of PCDDs - 135 congeners of PCDFs
Homologue: congeners with the same number of chlorine
Toxicity is congener-dependent - Toxicity Equivalent Factor (TEF) - Toxic Equivalence (TEQ)
No. Name Abb
4 Tetra T
5 Penta P
6 Hexa Hx
7 Hepta Hp
8 Octa O
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“Dioxins”
Chemical names - polychlorinated dibenzo-para-dioxins (PCDDs) - polychlorinated dibenzofurans (PCDFs)
Family of compounds (number and positions of chlorine atms)
- 75 congeners of PCDDs - 135 congeners of PCDFs
Homologue: congeners with the same number of chlorine
Toxicity is congener-dependent - Toxicity Equivalent Factor (TEF) - Toxic Equivalence (TEQ)
Congener TEF
2378 TCDD 1
12378 PCDD 0.5
123478 HxCDD 0.1
123678 HxCDD 0.1
123789 HxCDD 0.1
1234678 HpCDD 0.01
OCDD 0.001
2378 TCDF 0.1
12378 PCDF 0.05
23478 PCDF 0.5
123478 HxCDF 0.1
123678 HxCDF 0.1
234678 HxCDF 0.1
123789 HxCDF 0.1
1234678 HpCDF 0.01
1234789 HpCDF 0.01
OCDF 0.001
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Example of TEQ calculations
Congener TEF Actual, ng TEQ, ng
2378 TCDD 1 0.086 0.086
12378 PCDD 0.5 0.53 0.265
123478 HxCDD 0.1 0.3 0.03
123678 HxCDD 0.1 0.38 0.038
123789 HxCDD 0.1 0.34 0.034
1234678 HpCDD 0.01 1.8 0.018
OCDD 0.001 1.9 0.0019
2378 TCDF 0.1 0.51 0.051
12378 PCDF 0.05 0.84 0.042
23478 PCDF 0.5 1.6 0.8
123478 HxCDF 0.1 1.3 0.13
123678 HxCDF 0.1 1.2 0.12
234678 HxCDF 0.1 2 0.2
123789 HxCDF 0.1 0.9 0.09
1234678 HpCDF 0.01 2.4 0.024
1234789 HpCDF 0.01 0.84 0.0084
OCDF 0.001 1.4 0.0014
TOTAL 18.33 1.94
𝑇𝐸𝑄 = 𝑇𝐸𝐹𝑖 × 𝐶𝑖
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Perspective on Dioxins Limit
Environment Canada : 80 pg (TEQ) /Rm3
- 1 R m3 ~ 1.2 kg
- 1 pg = 10-15 kg
- 67 parts in 10+15 whole
- < 1 part in 10+13 whole
1 second in 320,000 years
1 human hair (100 um) in 25 x Earth Equators (25 x 40,000 km)
1.5 cm in earth-sun distance (150 million km)
1 mg = 1,000,000,000 pg
Elimination of Chlorine to prevent PCDD/Fs formation is “FUTILE”
Recall: HCL limit in mg/m3 and Dioxins in pg/m3
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Recent Test Results (2003 -2014)
CCME: 80 pg/Rm3
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Post-Incineration Formation
© Ketek Group Inc. Slide
63
September 2, 2015
http://www.ejnet.org/dioxin/dioxinpr2.pdf
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Summary: Relative Roles of (1) and (2) on (3)
Waste Incinerati
on
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Air
Waste
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Air Emission Regulations in Canada (incomplete)
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Roles of Waste Properties vs. Incinerator Design/Operation
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Aux Fuel
Incinerator capacity
Other Waste Properties and Incinerator operation
Waste Incinerati
on
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Heating value
Air
Waste
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Heating Value [MJ/kg]
Calorific value, Heat of combustion
High (Gross) vs. Low (Net) - Latent Heat of water
- H-content and water content
Adiabatic Combustion
Material Products
HX1
HX2
Liquid Water
Water Vapour
HIGH (Gross) Heating Value
LOW (Net) Heating Value
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Heating Value and Need for Aux. Fuel
Waste Incinerati
on
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Heating Value Sensible Heat (Temperature)
Latent Heat (Water→ Steam)
Aux Fuel
Additional HV
Air
Waste
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“Book values”
Waste Moist. Ash Comb HHV As- Fired
Type 0: paper, cardboard, plastics … 10% 5% 85% 19.8
Type 1: Type 0 + garbage (< 20%) 25% 10% 65% 15.0
Type 2: Type 0 + garbage (20 - 65%) 50% 7% 43% 9.9
Type 3: “Garbage” (residential, restaurants .) 70% 5% 25% 5.8
Type 4: Pathological/Anatomical waste 80% 10% 10% 2.3
Paper 10% 6% 84% 17.6
Wood 19% 1% 80% 20.0
Rags 9% 2% 88% 17.8
Coated Fabric (Rubber, Latex) 1% 20% 78% 25.6
Polyethylene (Plastics, Oil, Fats) 0% 0% 100% 42.0
Grass 43% 7% 50% 6.0
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Heating Value and Stoichiometric Air
y = 0.0731x R² = 0.991
0
0.5
1
1.5
2
2.5
3
3.5
4
0 10 20 30 40 50 60
kg O
2/k
g w
aste
DB
HHV, MJ/kg DB
Beech Kerosene
Black Locust Methanol, CH3OH
Douglas Fir Ethanol, C2H5OH
Hickory Coke-oven tar
Rice Hulls Charcoal
Cotton gin trash Carbon Monoxide, CO
n-octane
Water Hyacinth
(Florida)
Benzene, C6H6 Brown Kelp,Giant,
Soquel Point Motor Gasoline
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Incinerator Capacity or Throughput Often rated as x kg/hr
- Can an incinerator designed to burn 100kg/h of household refuse (A) be used to burn 100 kg/h plastics (B) ?
The answer is NO because:
- A requires ~ 300 m3/h air stoichiometric
- B requires ~ 2300 m3/h air stoichiometric
Incinerator capacity should be expressed as MJ/h (Btu/h)
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Bulk Density and Incinerator Mode of Operation
WI
Flue Gas
Ash
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate”
compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on
waste properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases (SO2, HCl, NOx ….) 3. Metals 4. POHCs and PICs
Bulk Density Feeding and ash removal methods
Air
Waste
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Bulk Density [kg/m3]
- The volume basis of m3 INCLUDES air space
- Compacted vs. non-compacted
- “Densification” increases BD
- (Incinerator capacity)
- High variability
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Bulk Density Data Variability
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Burn-Down
Incinerator Operation Mode
“Mode” refers to methods of feeding waste and ash removal
1. Continuous
2. Intermittent
3. Batch (one operation per cycle)
Burn Stage
Cool-Down, Maintenance … etc
Preheat Preparation
(Ash Removal)
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Burn-Down
Continuous and/or Intermittent Feed and Ash Removal
Burn Stage
Cool-Down, Maintenance … etc
Preheat Preparation
(Ash Removal)
• Operation in one cycle can run indefinitely: independent of waste
properties, limited by break-down, maintenance …
• Typical operation for gas and liquid (A) and large-scale solid waste
incinerators (A and B)
Time
Waste Feeding
Ash Removal (if needed)
A:
Time B:
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Example 1
Feed
Ash
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Example 2
Intermittent Feeding
Continuous Ash Removal
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Combustion
Chamber
Intermittent Feed, Batch Ash Removal
Burn-Down Burn Stage
Cool-Down, Maintenance … etc
Preheat Preparation
(Ash Removal)
Time
Waste Feeding
Ash Removal
• Burn stage is limited by combustion chamber filled up by ash (ash content
and bulk density of ash)
• Often used in small-scale solid waste incinerators
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Small-scale Intermittent Feeding
Emission of PICs soon after feeding due disturbance of already burning waste batches in chamber
1. Load
2. Feed
3. Close
4. Wait
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Batch Feeding and Batch Ash Removal
Burn-Down Burn Stage
Cool-Down, Maintenance … etc
Preheat Preparation
(Ash Removal)
Time
Waste Feeding
Ash Removal
“Do Nothing”
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Notes on Batch Feeding and Ash Removal
Batch size (kg) is limited by combustion chamber volume and bulk density of waste
Recommended by Environment Canada for small-scale bulk solid incineration
- Minimum air emissions both for PM and PICs - Ease of operation - Low man-power requirements
Re-burning may be necessary, which reduces capacity
Other factors are also important - Experience, judgement …..
Scaling-up is not straightforward
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Recap
1. Waste Characteristics 1. Physical state (gas, liquid or solid) and
combustion modes 2. “Ultimate” and “Proximate” compositions 3. Form, Heating Value and Bulk Density
2. Incinerator design and operation 1. Conditions for complete combustion 2. Consequences of incomplete combustion 3. Operating mode and dependence on waste
properties
3. Air emissions and ash quality 1. Particulate matter 2. Acid gases 3. Metals 4. POHCs and PICs
WI
Flue Gas
Ash Air
Waste
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Summary
Medium Regulated Parameters "Remedy"
POHCs & PICs Incinerator
Acid gases & metals Waste (mainly)
Particulate Both
Metals Waste
POHCs & PICs Incinerator
Flue gas
Ash
Proximate & Ultimate Compositions
Form, Heating Value & Bulk Density
Combustion and Opn modes (esp. solid)
3T's and xs O2 *
Case-specific + implementation
Understanding
MHB, VP, IDL …. *
* Mass and heat balance, Vapour Pressure, Ideal gas law
Tools
Information and Tools
Environmental Regulations
Waste Characteristics
Incineration Design and Operation
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Concluding Remarks Better awareness of waste incineration technology
- Fundamentals of waste properties and physical/chemical processes that are relevant to waste incineration
- Not that difficult to understand
- Selected examples of the practice of incineration
- Complexity and thus the need for experience and judgement (“Art” also involved)
Good starting point to learn more about waste incineration
- “Within” waste incineration itself AND “other” relevant topics.
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September 2, 2015 © Ketek Group Inc. 88
Email: [email protected] Phone: +1 780 447 5050
www.ketek.ca