technologies on air pollution control and emission reduction

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

1


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


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

3


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


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

5


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

6


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

7


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

8


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

9


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

10


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

11


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

12


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

13


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


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


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

16


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

17


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

18

Thank you!

technologies on air pollution control and emission reduction

Documents

air pollution control

industrial dust

dust concentration

dust removal2

dust resistivity

dust emission concentration

severe air pollution

heavy air pollution