Technologies on Air pollution
Control and Emission ReductionOn Asia-Europe Air Pollution Prevention and
Control Capacity Building Workshop
Yan ZhongkaiChina Association of Environmental Protection Industry (CAEPI)
October 23, 2013
China Association of Environmental Protection Industry
Contents
2.1 Dust removal2.2 DeSOx2.3 DeNOx2.4 VOCs Treatment2.5 Vehicle Exhaust Emission Control
2. Key technologies areas
1.Background
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Current Situation There has been an increasingly heavy air pollution in China. Many cities,
such as Beijing has continuously encountered severe air pollution and haze weather
The grim situation intensifies the pressure on the control of air pollution. To cope with the increasingly serious air pollution, China has issued a series of laws and regulations and planning for the control of air pollution
Policies Action Plan for Air Pollution Prevention and Control (State Council [2013]37) Key Areas of Air Pollution Prevention and Control during the Twelfth Five Year
(MEP [2012]130) On the Implementation of Air Pollutant Special Emission Limit Values (MEP
Announcement No.14, 2013) More stringent emission standards of air pollutants will be issued (thermal power,
steel and other industries)
1. Background
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2. Key Technologies Areas
Dust removal→emphasize on industrial dust and fumes ( six industries and coal boiler )DeSOx →emphasize on thermal plant, steel, chemistry industry and coal boilerDeNOx→emphasize on thermal plant, cement and industrial boilerVOCs→organic solvent usage industry (coating, packaging, printing, furniture, etc.)Vehicle exhaust emission control →emphasize on diesel vehicle exhaust emission
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2.1 Dust removal
Dust removal technologies
Low temperature electric dust removal technology
Moving electrode type electrostatic precipitation
Wet electric dust removal technology Electrostatic-fabric Integrated dust removal
technology Electric agglomeration High frequency power supply for
electrostatic precipitation High-end materials for bag filter
Focus on the following efficient dust removal technologies with improving traditional electric technology (such as increasing the electric field and dust collection area, etc.), cloth bag dust removal technology
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2 2.1.1 Low temperature electric dust removal technology
Low temperature electric dust removal technology The operating temperature drops from 120 ~130 to 85 ~110 , dust resistivity reduces 1 ~ ℃ ℃
2 magnitudes The fume and dust emission concentration can be less than 30 mg/m3 or even lower; Save the
standard coal consumption of 1.0 ~ 3.5 g/kWh There have been many application cases
Case : 660 MW unit electric precipitator reconstruction project of a Fujian power plant Dust emission drops from 60 mg/Nm3 to below 30mg/Nm3
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2.1.2 Moving electrode type electrostatic precipitation
Moving electrode type electrostatic precipitation Only adopted in final field, especially suitable for the reconstruction of old
units of electric precipitations The dust removal rate is up to 99.8%, dust concentration in the exit is
lower than 30mg/m3, the lowest is lower than 10mg/m3, the efficiency is increased from ordinary 50-70% to 70-90%
By the end of June this year, 300MW units and above have installed a total capacity of 25,000,000kW in contracts
Case : A 300MW unit electric precipitator reconstruction in the second phase of a Hebei power plant The fume and dust concentration in the exit drops from 150mg/m3
to 32mg/m3, which is lower than the designing value 40mg/m3
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2.1.3 Wet electric dust removal technology
Wet electric dust removal technology (Wet deSOx tower flue
gas treatment ) The dust removal rate is higher than 99.9%, the dust
concentration in the exit can be controlled within 20mg/m³ or
even lower than 5mg/m³, the removal rate of PM2.5 is up to 95%
Has been applied in a 300 MW unit of a power plant in Yiyang
City, Hunan Province with good effect
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2.1.4 Electrostatic-fabric Integrated dust removal technology
Electrostatic-fabric Integrated dust removal technology
especially suitable for electric precipitator reconstructed to
electrostatic-fabric Integrated precipitator
The dust removal rate is up to 99.9%, the discharged dust
concentration is lower than 30mg/m³ or even 10mg/m³, the
collection efficiency of PM2.5 is higher than 98%
Has been extensively applied in power plants
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2.1.5 Electric agglomeration
Electric agglomeration
Upgrade 30 ~ 80% of the collection efficiency of PM2.5
There has been a contract capacity of about 2100MW by the end of
March this year
Case : A 300MW unit electric precipitator in No. 9 furnace is
reconstructed in a power plant of Shanghai
The mass concentration of PM2.5 in the exit has dropped from 15.7
mg/m3 to 10.9 mg/m3
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2.1.6 High frequency power supply for electrostatic precipitator
High frequency power supply for electrostatic precipitator
dust discharge decline 50 ~ 90 % ,decrease power
consumption 50 ~ 90% Extensively applied
Case : (2×1000MWunit) high frequency power supply renovated in a power plant of Shanghai The dust concentration in the exit declined from
35 ~ 50mg/Nm3 to10 ~ 23mg/Nm3
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2.1.7 High-end materials for bag filter
High-end materials for bag filter
Technology development is long-life, efficiency and low
resistance. Domestic enterprises have mastered the
advanced filter spunlace production process, can greatly
improve the efficiency and life of the filter and remove PM2.5 to
a great extent
Mainly develop high-end materials such as PPS, P84, PTFE
and composite filter
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2.2 DeSOx
92%
3%2%
2%
1%
Proportion of technologies applied in power plant projects
Limestone - gypsum methodSeawater desulfurizationCirculation fluidized bedAmmonia desulfurization
DeSOx
Power plant
Iron and steel
sintering machine
Industrial boiler
Chemical Industry
Improvement of limestone - gypsum method
Resource utilization
Circulating fluidized bed method, ammonia method, limestone - gypsum method, active coke adsorption method
Large quantity in different areas, consume 1/3 of total coal consumption annually
At present, China’s thermal power plant air pollutant emission standards is the world’s most stringent, was implemented in 2012 , dust 、 SO2 、 Nox emission limits were 30mg/m3 、 100mg/m3 、 100mg/m3
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2.2.1 DeSOx in power plantImprovement of limestone - gypsum method, increase the spray layer, add desulphurization synergist, using double towers and double absorption process (desulfurization efficiency above 98%, SO2 emission concentrations of less than 50mg/m3) etc.
resource desulfurization technologies
Ammonia method for resource utilization
DeSOx ratio≥95% , ammonium sulfate accords with the requirement of GB 535-1995 , ammonia escape≤8mg/m3
Organic amine desulfurization technology ( adapt to the high sulfur coal) Desulfurization efficiency is not sensitive to the sulfur content of
the intake, processing SO2 concentrations up to 100008mg/m3
The deSOx ratio is up to 99.8%,recycling SO2 for producing H2SO4
Has been demonstrated on a 600MW unit in a power plant in Guizhou Province
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2.2.2 DeSOx for Sintering Machines
Sintering desulfurization process using more dispersed
(unlike thermal power plants), including circulating fluidized
bed method, ammonia method, limestone - gypsum method,
active coke adsorption method etc., about 50% of the first
three
China has more than 1,200 sets of sintering machines with a
deSOx market capacity of 15 billion RMB
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2.3 DeNOx
By 2012, the deNOx units installed capacity has been up to 225 million
kW, accounting for 27.27% of the thermal power installed capacity
The market demand will be 100 billion RMB during the 12th Five-Year
Plan
DeNOx
Power plant
Cement
Industrial boiler
SCR/SNCR/(SNCR+SCR)
LNB+SNCR
SCR/SNCR/Ozonation
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2.4 VOCs treatment
55%25%
15%
5%
Market Share of Mature Technologies and
Products
Adsorption-catalytic combustionCatalytic combustionAdsorption and RecoveryOthers
VOCs Pollution Control Technologies Policy (MEP Announcement No. 31, 2013)
End-treatment leading technical route:
High concentration VOCs→Condensation and recovery/adsorption and recovery
Medium Concentration VOCs →adsorption and recovery/catalytic combustion/thermal incineration
Low Concentration VOCs→ adsorption and recovery/adsorption, concentration and combustion/ plasma technology( not recover)
Catering Industry→promote fume exhausting devices with oil mist recycling
VOCs containing organic halogen elements → non incineration technology
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2.4 VOCs treatment
Low temperature plasma technology for VOCs purification The purification rate for low concentrations (less than 300 mg/m3 ) VOCs is
more than 70%
Typical Technologies
Activated carbon adsorption recycling method Removing(recycling) rate is 95%, the emission concentration is lower than
50 mg/m³
Adsorption (stripping) - catalytic combustion integrated method Solves technical difficulties of VOCs with huge volume, low concentration
Double dielectric barrier discharge plasma used for industrial odorous waste gas treatment Can remove 90% VOCs, the emission concentration is lower than 50mg/m³
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2.5 Vehicle Exhaust Emission Control
DPFCapturing more than 95% of the particles in the exhaust gas , strong ability of capturing PM2.5, the emission concentration is lower than 0.25 mg/L
Technologies for diesel exhaust : Internal combustion technology /EGR+ SCR/DPFDOC+DPF/POC+SCR
SCRRemoval of more than 70% NOx of the exhaust gas
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Thank you!