Carbon Constraints Are Reshaping Industrial Emission Control: Why Ammonia-Based Desulfurization Is Gaining Attention

As global industries accelerate their transition toward low-carbon development, carbon emissions are becoming an increasingly important factor in technology selection. Environmental protection solutions are no longer evaluated only by their ability to meet pollutant emission standards, but also by their contribution to carbon reduction, resource efficiency, and sustainable operation.

Recently, China’s national carbon emission trading system has continued expanding coverage, bringing more high-emission industries into carbon management frameworks. With sectors such as steel, cement, and aluminum entering mandatory carbon compliance stages, industrial enterprises are facing a new challenge: how to achieve emission reduction while controlling carbon-related operational costs.

This shift is driving a new evaluation standard for flue gas treatment technologies.

Traditional desulfurization systems have focused primarily on sulfur dioxide (SO₂) removal efficiency. However, under increasingly strict carbon management policies, the carbon footprint associated with different desulfurization routes is becoming a key consideration.

Carbon Challenges Associated with Traditional Limestone FGD

For decades, limestone-gypsum desulfurization (limestone FGD) has been widely adopted due to its mature technology, reliable operation, and relatively low raw material cost.

However, the process relies on limestone as an absorbent. During limestone preparation and chemical reactions, carbon emissions are generated due to carbonate decomposition.

As carbon prices increase and carbon allowance systems become more stringent, these indirect emissions may translate into additional compliance costs for industrial enterprises.

For large-scale facilities with high sulfur dioxide loads, even small differences in process-related carbon emissions can have a measurable impact on carbon allowance management.

In addition, limestone FGD systems often face other operational challenges, including:

• Large equipment footprint
• Desulfurization wastewater treatment requirements
• Gypsum handling and utilization challenges
• Additional auxiliary energy consumption

These factors are encouraging industries to reconsider traditional emission control approaches and explore more sustainable alternatives.

Ammonia-Based Desulfurization: A Low-Carbon Alternative

Unlike limestone-based processes, ammonia-based desulfurization does not rely on carbonate-based absorbents.

The process uses ammonia to react with sulfur dioxide in flue gas, producing ammonium sulfite, which is further oxidized into ammonium sulfate.

Throughout the process, there is no limestone calcination step and no process carbon emissions generated from carbonate decomposition.

More importantly, the sulfur removed from industrial emissions is converted into ammonium sulfate, a valuable nitrogen-sulfur fertilizer product that can be integrated into agricultural and industrial supply chains.

This creates a circular model:

SO₂ emission control → resource recovery → valuable product generation

Instead of treating sulfur removal as a pure environmental cost, ammonia-based desulfurization enables industries to combine emission reduction with resource utilization.

Supporting Industrial Decarbonization Strategies

As carbon management becomes increasingly important, companies are looking for technologies that can support both environmental compliance and operational efficiency.

Ammonia-based desulfurization provides several advantages:

Reduced Carbon Pressure

Because the process avoids carbonate decomposition, enterprises can reduce carbon emissions associated with the desulfurization process itself and optimize carbon allowance management.

Resource Recovery

The production of ammonium sulfate transforms sulfur pollutants into useful resources, supporting circular economy development.

Lower Water Consumption

Advanced ammonia-based systems can operate without traditional desulfurization wastewater generation, reducing water treatment requirements.

Compact System Design

The integrated process structure allows efficient installation, especially for industrial retrofit projects where space is limited.

MirShine’s Advanced Ammonia-Based Desulfurization Technology

With more than 20 years of experience in ammonia-based desulfurization, MirShine Environmental has continuously developed and optimized its technology platform through multiple generations of engineering improvements.

The company’s proprietary Cascade Separation and Purification Integrated Ammonia Desulfurization and Dust Removal Technology integrates desulfurization, dust removal, ammonia control, and by-product recovery within a highly efficient process system.

Key advantages include:

• Integrated tower design to simplify system configuration
• Reduced dependence on high-energy auxiliary equipment
• Stable SO₂ removal performance
• Effective ammonia slip control
• High-quality ammonium sulfate recovery

Through optimized absorption, oxidation, and crystallization processes, the system achieves efficient sulfur dioxide removal while improving resource utilization.

The technology has been successfully applied in multiple industrial sectors, including power generation, steel, chemical industries, and industrial boilers.

The Future of Flue Gas Treatment in a Carbon-Constrained Era

The expansion of carbon markets is changing how industries evaluate environmental technologies.

Future competition among flue gas treatment solutions will not only focus on whether a system can achieve emission compliance, but also on:

• Carbon impact
• Resource efficiency
• Operating economics
• Long-term sustainability

As carbon constraints continue to increase, technologies that can reduce emissions while creating additional value will become increasingly important.

Ammonia-based desulfurization represents a new direction for industrial sulfur dioxide control—one that combines environmental protection, resource recovery, and low-carbon development.

For industries preparing for stricter carbon management requirements, selecting the right desulfurization technology today will become an important strategic decision for sustainable growth tomorrow.