wosdahai@163.com

Cutting-Edge Solutions for Cleaner Air and Compliance SCR, FGD & Dust Control — One Partner for Cleaner Flue Gas.

Home > Technologies > Industrial Flue Gas Desulfurization

CFB Semi-Dry Circulating Fluidized Bed Desulfurization

Working Principle

The CFB semi-dry desulfurization process applies circulating fluidized bed principles. Dry calcium-based desulfurizer, mixed with recycled ash from the desulfurization tower and dust collector, is humidified and activated before circulating contact with flue gas in the tower. Chemical reactions remove SO₂/SO₃, HCl, HF, etc. Intense particle turbulence in the absorption tower continuously renews calcium hydroxide (Ca(OH)₂) surfaces via collisions, significantly enhancing reactivity. Moistened recycled ash ensures superior fluidity and allows repeated reagent reuse.

Desulfurization Reactions

1. Primary Reactions:
Ca(OH)₂ + SO₂ + 1/2H₂O → CaSO₃·1/2H₂O + H₂O
Ca(OH)₂ + SO₃ + H₂O → CaSO₄·2H₂O
CaSO₃·1/2H₂O + 1/2O₂ + 3/2H₂O → CaSO₄·2H₂O

2.Secondary Reactions:
Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O (>120°C)
Ca(OH)₂ + 2HF → CaF₂ + 2H₂O

Process Flow

01
Accelerated Gas-Solid Contact
Flue gas accelerates through a venturi tube at the tower base, entering the fluidized bed. Turbulent mixing creates a high-velocity gas-solid flow (slip velocity >10× single-particle rate).
02
Reaction Enhancement
The tower’s roof structure intensifies "floc disintegration-recirculation", raising bed density to Ca/S ratio >50 for near-complete SO₂ removal.
03
Ash Recycling
Partial particles exit with flue gas others return to the bed, extending reaction time.
Purified gas undergoes gas-solid separation in a dust collector.
Collected ash recycles to the tower via a pneumatic conveying system excess ash discharges via dense-phase pumps.

Technical Features

≥95% Efficiency
at Ca/S ratio 1.1–1.3
CAPEX/OPEX Savings
50–70% lower than wet FGD
Compact & Flexible
Ideal for retrofits/space-limited sites
System Simplicity
40–50% fewer components vs. wet FGD low maintenance
Dry Byproduct
Recyclable as cement additive or soil conditioner
Zero Wastewater/Plume
Energy-efficient, adaptive to sulfur fluctuations

Applications

Coal-fired power plants, cogeneration boilers, central heating boilers, sintering machines, pellet shaft furnaces, coking ovens, glass/ceramic kilns.

Biomass-fired boiler denitrification
Coal-fired boiler denitrification
Rotary kiln denitrification
Silicone production denitrification
Waste incineration plant denitrification
Aluminum electrolysis denitrification
Metal smelting denitrification
Medical waste incineration denitrification

Bolaida's Commitment

"One Enterprise, One Strategy": We deliver customized desulfurization/denitrification solutions—new builds or retrofits—ensuring compliance, ultra-low emissions, and sustainable operations for industrial clients.

Industry Solutions & Case StudiesFrom crisis to compliance, how we solved real-world crises?

: Spray Tower Flue Gas De-whitening Project

A company in Chongqing has a spray tower. During the low temperatures in winter, the white smoke em...
Read More

: New Material Company's Hazardous Solid Waste Incineration Flue Gas De-whitening Project

A new material company in Jiangsu faced complaints from residents due to the visible smoke and long ...
Read More

: China's Hazardous Waste Incineration Flue Gas Treatment and Odor Removal Project

A hazardous waste incineration company in Zhejiang faced the problem of high-concentration smoke and...
Read More

: Innovative De-whitening of Calcination Kiln Flue Gas in China's Chemical Industry

A chemical enterprise in Henan has calcination kilns. During the production process, the dust conten...
Read More

: Emission Reduction Boiler Flue Gas Treatment for a Chinese Company

An enterprise in Inner Mongolia operates two 40T/H chain grate boilers fueled by coal. However, the ...
Read More

: Sulfuric Acid Desulfurization and De-Whitening Project of a Chemical Enterprise Achieves Significant Emission Reduction

Project category:Sulfuric acid production desulfurization flue gas de-whitening project Products/tec...
Read More

Industry Solutions & Case StudiesFrom crisis to compliance, how we solved real-world crises?

: Spray Tower Flue Gas De-whitening Project

A company in Chongqing has a spray tower. During the low temperatures in winter, the white smoke em...
Read More

: New Material Company's Hazardous Solid Waste Incineration Flue Gas De-whitening Project

A new material company in Jiangsu faced complaints from residents due to the visible smoke and long ...
Read More

: China's Hazardous Waste Incineration Flue Gas Treatment and Odor Removal Project

A hazardous waste incineration company in Zhejiang faced the problem of high-concentration smoke and...
Read More

: Innovative De-whitening of Calcination Kiln Flue Gas in China's Chemical Industry

A chemical enterprise in Henan has calcination kilns. During the production process, the dust conten...
Read More

: Emission Reduction Boiler Flue Gas Treatment for a Chinese Company

An enterprise in Inner Mongolia operates two 40T/H chain grate boilers fueled by coal. However, the ...
Read More

: Sulfuric Acid Desulfurization and De-Whitening Project of a Chemical Enterprise Achieves Significant Emission Reduction

Project category:Sulfuric acid production desulfurization flue gas de-whitening project Products/tec...
Read More

Achieve Corporate Environmental ComplianceOur international engineer will contact you within 3 minutes

Navigation

Products Technologies Industries and Cases Service and Support Blogs About Us Contact

Contact Us

Email:wosdahai@163.com
Phone:+86 18163130333
WhatsApp:+86 18163130333

Room 305, Building B, Chuangye Mansion, Guiyuan Avenue, Nanchang Economic Development Zone, Nanchang City, Jiangxi Province, China

Phone/WhatsApp：+86 13879859268
Email：wosdahai@163.com
Address：Room 305, Building B, Chuangye Mansion, Guiyuan Avenue, Nanchang Economic Development Zone, Nanchang City, Jiangxi Province, China