Technologies on Air pollution Control and Emission Reduction On Asia-Europe Air Pollution Prevention...
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Technologies on Air pollution Control and Emission Reduction On Asia-Europe Air Pollution Prevention and Control Capacity Building Workshop Yan Zhongkai
Technologies on Air pollution Control and Emission Reduction On
Asia-Europe Air Pollution Prevention and Control Capacity Building
Workshop Yan Zhongkai China Association of Environmental Protection
Industry (CAEPI) October 23, 2013
Slide 2
China Association of Environmental Protection Industry Contents
2.1 Dust removal 2.2 DeSOx 2.3 DeNOx 2.4 VOCs Treatment 2.5 Vehicle
Exhaust Emission Control 2. Key technologies areas 1.Background
1
Slide 3
China Association of Environmental Protection Industry 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 2
Slide 4
China Association of Environmental Protection Industry 2. Key
Technologies Areas Dust removalemphasize on industrial dust and
fumes six industries and coal boiler DeSOx emphasize on thermal
plant, steel, chemistry industry and coal boiler DeNOxemphasize on
thermal plant, cement and industrial boiler VOCsorganic solvent
usage industry (coating, packaging, printing, furniture, etc.)
Vehicle exhaust emission control emphasize on diesel vehicle
exhaust emission 3
Slide 5
China Association of Environmental Protection Industry 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 4
Slide 6
China Association of Environmental Protection Industry 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/m 3 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/Nm 3 to below 30mg/Nm 3 5
Slide 7
China Association of Environmental Protection Industry 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/m 3, the lowest is
lower than 10mg/m 3, 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/m 3 to 32mg/m 3, which is lower than
the designing value 40mg/m 3 6
Slide 8
China Association of Environmental Protection Industry 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/m or even lower than 5mg/m, the removal
rate of PM 2.5 is up to 95% Has been applied in a 300 MW unit of a
power plant in Yiyang City, Hunan Province with good effect 7
Slide 9
China Association of Environmental Protection Industry 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/m or even 10mg/m, the collection efficiency of PM 2.5 is
higher than 98% Has been extensively applied in power plants 8
Slide 10
China Association of Environmental Protection Industry 2.1.5
Electric agglomeration Electric agglomeration Upgrade 30 80% of the
collection efficiency of PM 2.5 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 PM 2.5 in the exit has
dropped from 15.7 mg/m 3 to 10.9 mg/m 3 9
Slide 11
China Association of Environmental Protection Industry 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 (21000MWunit) high frequency power supply
renovated in a power plant of Shanghai The dust concentration in
the exit declined from 35 50mg/Nm 3 to10 23mg/Nm 3 10
Slide 12
China Association of Environmental Protection Industry 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 PM 2.5 to a great extent Mainly develop
high-end materials such as PPS, P84, PTFE and composite filter
11
Slide 13
China Association of Environmental Protection Industry 2.2
DeSOx De SO x Power plant Iron and steel sintering machine Industri
al 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, Chinas thermal power plant air
pollutant emission standards is the worlds most stringent, was
implemented in 2012 dust SO 2 No x emission limits were 30mg/m 3
100mg/m 3 100mg/m 3 12
Slide 14
China Association of Environmental Protection Industry 2.2.1
DeSOx in power plant Improvement of limestone - gypsum method,
increase the spray layer, add desulphurization synergist, using
double towers and double absorption process (desulfurization
efficiency above 98%, SO 2 emission concentrations of less than
50mg/m 3 ) etc. resource desulfurization technologies Ammonia
method for resource utilization DeSOx ratio95% ammonium sulfate
accords with the requirement of GB 535-1995 ammonia escape8mg/m 3
Organic amine desulfurization technology adapt to the high sulfur
coal Desulfurization efficiency is not sensitive to the sulfur
content of the intake, processing SO 2 concentrations up to
100008mg/m 3 The deSOx ratio is up to 99.8%,recycling SO 2 for
producing H 2 SO 4 Has been demonstrated on a 600MW unit in a power
plant in Guizhou Province 13
Slide 15
China Association of Environmental Protection Industry 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 14
Slide 16
China Association of Environmental Protection Industry 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 15
Slide 17
China Association of Environmental Protection Industry 2.4 VOCs
treatment VOCs Pollution Control Technologies Policy (MEP
Announcement No. 31, 2013) End-treatment leading technical route :
High concentration VOCsCondensation 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 Industrypromote fume exhausting devices with oil mist
recycling VOCs containing organic halogen elements non incineration
technology 16
Slide 18
China Association of Environmental Protection Industry 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/m 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/m 17
Slide 19
China Association of Environmental Protection Industry 2.5
Vehicle Exhaust Emission Control DPF Capturing more than 95% of the
particles in the exhaust gas, strong ability of capturing PM 2.5,
the emission concentration is lower than 0.25 mg/L Technologies for
diesel exhaust Internal combustion technology /EGR+ SCR/DPF
DOC+DPF/POC+SCR SCR Removal of more than 70% NOx of the exhaust gas
18