wet flue gas desulphurisation technology with...
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Wet Flue Gas DesulphurisationTechnology With Limestone-Gypsum
Zhejiang Feida Environmental Science & Technology Co.,Ltdhttps://www.feidaep.com/
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CONTENTSWet Limestone-Gypsum FGDWet Limestone-Gypsum FGD
Company OverviewCompany Overview
Absorber TechnologiesAbsorber Technologies
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The Secret of High EfficiencyThe Secret of High Efficiency
Reference ProjectsReference Projects
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1. Company Overview
Registered Capital: CNY 547 Million
Total Assets: CNY 8.12 Billion
Employee Strength: Over 4,000 nos.
• The Largest National Flagship Enterprise in theEnvironmental Protection Equipment Industry of China
• Established by Government of China in 1969• Listed in Shanghai Stock Exchange in 2002
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Zhejiang Feida Environmental Science & Technology Co., Ltd.
( FEIDA )
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Company Location
Beijing
Shanghai
CHINA
1. Company Overview
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Jiangsu Baoying Industrial Base
Jiangsu Yancheng Industrial Base
ZhujiHangzhou
Head Office of FEIDAZhuji, Zhejiang Province
Zhuji Paitou Industrial Base
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Main Products Flue Gas Cleaning System: FGD (Wet FGD, Semi-
dry FGD), NOX Removal, Particulate Removal, etc Others: Solid Waste Treatment, Water Treatment,
electrical control equipment, etc
1. Company Overview
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Boiler
DeNOxESP/FF WFGD
Stack
2. Wet Limestone-Gypsum FGD
Flue Gas Cleaning System for Coal Fired Power Plant
WFGDESP/FF
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limestone CaCO3
lime CaO, slaked lime Ca(OH)2
ammonia NH3
magnesium oxide MgO
sodium-carbonate Na2CO3
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There are many materials can be used as absorbent:
2. Wet Limestone-Gypsum FGD
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Limestone
Raw Gas
Air
Clean Gas
Water
Gypsum
Effluent
AbsorbentPreparation
Flue Gas Cleaning Gypsum Dewatering
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Simple and reliable process technologies The 1st Advantage of Limestone as Absorbent Material:
2. Wet Limestone-Gypsum FGD
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Can be used as follows:
a)Use as cement retarder
b)Produce gypsum product,
such as plasterboard
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Hydrocyclone / Belt Filter Arrangement
Hydrocyclone
Belt Filter
Produce environmental
neutral by-product:
Commercial-grade gypsum
The 2nd Advantage of Limestone as Absorbent Material:
2. Wet Limestone-Gypsum FGD
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Other Advantages of Limestone as Absorbent Material:
Extended operating experience
Good absorbent availability world-wide
High removal efficiencies feasible
Cost optimum technologies ( investment and operation )
For standard application
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2. Wet Limestone-Gypsum FGD
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① Normal Single-Loop Absorber
② Perforated Plate Absorber
③ Dual-Loop Absorber
3. Absorber Technologies
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3.1 Normal Single-Loop Absorber
Design Concept
• Single loop open spray absorber
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Spray layers
M/E
Advantages• Stable chemistry
• Power consumption adjustable to SO2 load
• High operational reliability
• Less inspection and maintenance
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3.2 Perforated Plate Absorber
Advantages: Reduce spraying liquid quantity Increase desulfurization efficiency
and dust removal efficiencyOne of the best choice to meet the ultralow emission-
35 mg/Nm3 SO2 Emission 5 mg/Nm3 Particle Emission
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Design Concept
• Installed with perforated plates under the lowest spray layer
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Advantages:• Suitable for high SO2
concentration and high removal efficiency requirement
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3.3 Dual-Loop Absorber
Design Concept: 2-loop Design
Primary Spray Layer
Secondary Spray Layer
M/E
Slurry Collector
Primary Tank
Secondary Tank
Primary loop: low PH-value improves oxidation, limestone dissolution
Secondary loop: high pH-value improves desulfurization efficiency, gypsum formation and crystallization
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High Efficiency Spray Layers
Excellent Oxidation MethodAbsorber Inlet Technology
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4. The Secret of High Efficiency
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Absorber Inlet:• Bad working condition, prone to corrosion and scaling
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4.1 Absorber Inlet Technology
CN 200610053259.8 Collect the wall flow,
reduce the risk of scaling Improve the gas flow
distribution
Flue Gas Inlet
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Key Equipment
Use Stepped Pipeline
Adopt Staggered
Arrangement
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4.2 High Efficiency Spray Layers
Spray Layers
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Tangential Cone Opposite Tangential Cone Twin Tangential Cone
Different options will make differences
Installed downward direction
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4.2 High Efficiency Spray Layers
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Oxidation Air Nozzle
Side Entering Agitator
Air Distribution
Side-entry Oxidation Agitator:most widely used in the world
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4.3 Excellent Oxidation Method
Features:High air-utilization percentage: Permits small absorber liquid retention volumeless scaling and plugging problems
Inside
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FEIDA ENVIRO
5. Reference Projects
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• Newly constructed, 1 absorber serves 1 unit• 2 378 160 m3/h (STP, wet) flue gas flow rate• 2 480 mg/Nm3 (STP, dry) SO2 inlet•110 mg/Nm3 (STP, dry) SO2 outlet•95.5% SO2 removal efficiencyCompletion time 12 monthsStart-up Aug. 2008
FGD Ningxia Daba Unit 1 & Unit 2 (600MW each)
5.1 Normal Single-Loop Absorber Reference Projects
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1#Absorber
2#Absorber
Outlet
Inlet
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FGD Huarun Haifeng Unit 1 & Unit 2 (1000MW each)
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Absorber
• Newly constructed• 1 absorber serves 1 unit• 3 497 185 m3/h (STP, wet) flue gas flow rate• 4 800 mg/Nm3 (STP, dry) SO2 inlet• 100 mg/Nm3 (STP, dry) SO2 outlet•97.9% SO2 removal efficiencyCompletion time 24 monthsUnit 2 Start-up Aug. 2014Unit 1 Start-up March 2015
5.1 Normal Single-Loop Absorber Reference Projects
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5.2 Perforated Plate Absorber References Plants
FGD Shangdu Unit 5 & Unit 6 (660MW each)
• Ultra Low Emission Retrofit Project • 1 absorber serves 1 unit• 2 689 236 m3/h (STP, wet) flue gas flow rate• 4221 mg/Nm3 (STP, dry) SO2 inlet• 35 mg/Nm3 (STP, dry) SO2 outlet• 30 mg/Nm3 (STP, dry) particle inlet• 5 mg/Nm3 (STP, dry) particle outlet• 99.2% SO2 removal efficiencyCompletion time 8 monthsUnit 5 Start-up Dec. 2016, Unit 6 Start-up May 2017
Absorber
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FGD Fujian Kemen Unit 1 & Unit 2 (600MW each)
5.2 Perforated Plate Absorber References Plants
• Ultra Low Emission Retrofit Project• 1 absorber serves 1 unit• 2 146 156 m3/h (STP, wet) flue gas flow rate• 2415 mg/Nm3 (STP, dry) SO2 inlet• 30 mg/Nm3 (STP, dry) SO2 outlet• 25 mg/Nm3 (STP, dry) particle inlet• 5 mg/Nm3 (STP, dry) particle outlet• 98.6% SO2 removal efficiencyCompletion time 8 monthsUnit 1 Start-up July 2017, Unit 2 Start-up June 2018
Absorber
Inlet
Outlet
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5.3 Dual-Loop Absorber Reference Project
• Newly constructed•1 365 546 m3/h (STP, wet) flue gas flow rate• 8 547 mg/Nm3 (STP, dry) SO2 inlet• 35 mg/Nm3 (STP, dry) SO2 outlet• 99.6% SO2 removal efficiencyCompletion time 24 monthsStart-up Dec. 2017
FGD Shanxi Datuhe Unit 1 & Unit 2 ( 350MW each )
Absorber
Wet EP
Secondary Reaction Tank
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FEIDA ENVIRO
Thank you !