EN
As global carbon reduction targets and environmental regulations continue to tighten, the coking industry—characterized by high energy consumption and high emissions—is accelerating the implementation of ultra-low emission retrofits for flue gas desulfurization and denitrification systems.
When selecting a desulfurization technology route, coke producers must carefully evaluate flue gas characteristics, plant operating conditions, long-term operating costs, and byproduct management. Among available options such as limestone-gypsum desulfurization, sodium-based processes, and ammonia-based desulfurization, ammonia FGD has emerged as the most suitable solution for the coking industry, offering strong process compatibility, resource recovery potential, and controllable lifecycle costs.
Flue Gas Characteristics of Coke Ovens and Technology Adaptability
Coke oven flue gas typically features relatively low temperatures (180–280°C), high moisture content, and complex compositions, including tar mist, fine dust, sulfur dioxide (SO₂), nitrogen oxides (NOₓ), and trace hazardous components. These conditions place higher demands on the stability, adaptability, and operational flexibility of desulfurization systems.
Traditional calcium-based desulfurization technologies, while mature, often encounter issues such as scaling, slurry handling complexity, solid waste disposal pressure, and purely cost-driven operation with limited economic return. In contrast, ammonia-based desulfurization fully leverages liquid ammonia or ammonia water—either internally generated or externally supplied—commonly available in coking enterprises, enabling efficient sulfur removal and valuable byproduct recovery.
High-Efficiency Ammonia-Based Desulfurization for Coke Plants
Represented by MirShine Environmental’s independently developed Multi-Stage Separation Ammonia-Based Desulfurization and Dedusting Integrated Technology, modern ammonia FGD systems have reached an advanced international level and demonstrated significant advantages in coke industry applications.
First, desulfurization efficiency consistently exceeds 98%, ensuring stable compliance with ultra-low emission requirements and maintaining SO₂ outlet concentrations below 30 mg/Nm³.
Second, through multi-stage gas–liquid separation and deep purification design, the system effectively suppresses ammonia slip (below 1 mg/Nm³) and prevents sulfate aerosol formation. This eliminates visible plume issues and minimizes environmental impact on surrounding areas, addressing long-standing concerns associated with traditional ammonia-based processes.
Third, the system provides synergistic dust removal and supportive denitrification conditions. Fine particulate matter is partially removed during desulfurization, while optimized ammonia injection control improves flue gas quality for downstream SCR or SNCR systems. This integrated approach reduces overall system complexity and operating costs.
Fourth, the reaction byproduct is high-purity ammonium sulfate, which can be directly marketed as agricultural fertilizer. This transforms sulfur pollutants into valuable resources, offsets part of operating expenses, and significantly enhances project economic performance.
Integration with Existing Coking Plant Systems
A key advantage of ammonia-based desulfurization lies in its strong compatibility with existing coking plant infrastructure. The system can be seamlessly integrated with coal gas purification units, waste heat recovery systems, and negative-pressure coke oven operations, minimizing additional land requirements and incremental energy consumption.
The fast liquid-phase reaction kinetics and low system pressure drop ensure minimal interference with coke oven draft control, maintaining stable and safe continuous production—an essential requirement in coking operations.
A Proven Path Toward Sustainable Coke Production
Ammonia-based desulfurization aligns closely with the flue gas characteristics and operational realities of the coking industry. It delivers a balanced combination of high environmental performance, resource recycling, operational safety, and economic feasibility.
Through continuous technological innovation, MirShine Environmental has fundamentally resolved historical challenges such as ammonia slip and aerosol emissions, enabling ammonia FGD to evolve into a truly efficient, clean, economical, and reliable integrated solution.
Under current and future ultra-low emission policies, ammonia-based desulfurization stands out as the preferred technical route for desulfurization and denitrification retrofits in the coking industry, providing a practical and proven pathway toward greener and more sustainable coke production.