VPSA Oxygen Generation
Gas Separation
Hydrogen Energy
Green & Efficient
Oxy-Fuel Combustion Technology
Ozone Generation
Equipment Leasing & Operation Services
Resource Utilization of Industrial Exhaust Gas
Challenges Under Emission Policies
With the implementation of ultra-low emission policies, the allowable concentrations of particulate matter, SO₂, and NOx must be significantly reduced (≤35 mg/m³ for pelletizing and sintering, ≤50 mg/m³ for ironmaking/steelmaking/rolling).
Traditional end-of-pipe desulfurization methods for blast furnace gas require installing desulfurization units at each individual gas consumption point (such as hot blast stoves and sintering), typically over a dozen points. This approach faces critical challenges:
· High investment cost (3–5 million RMB per unit)
· Large land occupation (total area exceeding 2000 m²)
· Difficult management (decentralized operation and maintenance)
Such issues conflict with the steel industry’s demand for intensive and integrated development.
Blast Furnace Gas Deep Desulfurization Process
Considering the characteristics of blast furnace gas — large volume (≥200,000 Nm³/h) and high organic sulfur content (COS + CS₂> 80 %) — Lirun Technology innovatively proposes a three-stage purification process:“pre-treatment-catalytic hydrolysis-dry desulfurization”
· Pre-treatment Unit: Removes dust, chlorine, and other poisons
· Catalytic Hydrolysis Unit: Converts organic sulfur compounds (COS → H₂S)
· Dry Desulfurization Unit: Deep removal of H₂S (outlet concentration≤10 mg/m³)
Core Reaction Mechanisms
Catalytic Hydrolysis
COS + H₂O→H₂S + CO₂(conversion rate≥98%)
CS₂+ 2H₂O→2H₂S + CO₂
Dry Desulfurization
H₂S +½O₂→S + H₂O (sulfur capacity≥25%)
Challenges Under Emission Policies
With the implementation of ultra-low emission policies, the allowable concentrations of particulate matter, SO₂, and NOx must be significantly reduced (≤35 mg/m³ for pelletizing and sintering, ≤50 mg/m³ for ironmaking/steelmaking/rolling).
Traditional end-of-pipe desulfurization methods for blast furnace gas require installing desulfurization units at each individual gas consumption point (such as hot blast stoves and sintering), typically over a dozen points. This approach faces critical challenges:
· High investment cost (3–5 million RMB per unit)
· Large land occupation (total area exceeding 2000 m²)
· Difficult management (decentralized operation and maintenance)
Such issues conflict with the steel industry’s demand for intensive and integrated development.
Blast Furnace Gas Deep Desulfurization Process
Considering the characteristics of blast furnace gas — large volume (≥200,000 Nm³/h) and high organic sulfur content (COS + CS₂> 80 %) — Lirun Technology innovatively proposes a three-stage purification process:“pre-treatment-catalytic hydrolysis-dry desulfurization”
· Pre-treatment Unit: Removes dust, chlorine, and other poisons
· Catalytic Hydrolysis Unit: Converts organic sulfur compounds (COS → H₂S)
· Dry Desulfurization Unit: Deep removal of H₂S (outlet concentration≤10 mg/m³)
Core Reaction Mechanisms
Catalytic Hydrolysis
COS + H₂O→H₂S + CO₂(conversion rate≥98%)
CS₂+ 2H₂O→2H₂S + CO₂
Dry Desulfurization
H₂S +½O₂→S + H₂O (sulfur capacity≥25%)
Application Scope
The Blast Furnace Gas Deep Desulfurization
Technology is primarily applied in the full-process gas purification systems of
integrated steel enterprises, including:
· Hot blast stoves (processing capacity:
200,000–500,000 Nm³/h)
· Rolling reheating furnaces (sulfur content
≤5 mg/Nm³)
· Gas-fired power generation (SO₂ emissions ≤35 mg/Nm³)
Lirun Technology’s innovative three-stage
process of pre-treatment – catalytic hydrolysis – dry desulfurization utilizes specialized hydrolysis catalysts (organic sulfur conversion rate ≥98%)
and high-efficiency desulfurizing agents (sulfur capacity ≥25%). This enables
the system to reduce total sulfur content in blast furnace gas from 100–200
mg/Nm³ to below 10 mg/Nm³, while maintaining system pressure drop <3 kPa and
adapting to operating temperatures of 80–150 °C. Annual operating costs are
reduced by 40–50% compared with end-of-pipe treatments, providing an economic
and efficient solution for steel enterprises to achieve ultra-low emissions.
Simultaneous removal of organic and inorganic sulfur
Outlet sulfur content ≤10 mg/Nm³
Fully compliant with ultra-low emission standards
Entirely dry process
No wastewater generation
Reduced burden on wastewater treatment systems
Handles sulfur fluctuation (50–300 mg/Nm³)
Strong adaptability to varying operating conditions
Consistently high desulfurization efficiency
Spent adsorbents reused within steel plants
No solid waste discharge
Enables closed-loop resource management
Fully automated operation
Safety interlock protection
Simple, efficient operation
Hydrolysis catalyst lifetime >1.5 years
Desulfurizing agent lifetime >1 year
Annual operating time ≥8,400 hours
