In recent years, as my country's "Blue Sky Defense Campaign" continues to advance, requirements for controlling nitrogen oxide emissions in the thermal power industry have become increasingly stringent. However, while achieving ultra-low emissions, the problem of "ammonia slip" caused by extensive ammonia injection has become increasingly prominent. Precision ammonia injection technology, a key means of improving denitrification efficiency and reducing ammonia slip, is gradually becoming a hot topic for denitrification retrofits in the thermal power industry.

Precision Ammonia Injection - From "Extensive Management" to "Fine Control"

1、Rigid constraints of policies and regulations

In recent years, my country has introduced a series of stringent environmental regulations, imposing higher NOx emissions requirements on thermal power plants. A nitrogen oxide level of 50 mg/m³ has become standard practice. According to standards such as the "Technical Specification for Flue Gas Denitrification in Thermal Power Plants - Selective Catalytic Reduction Method" (HJ562-2010), ammonia slip concentrations must be controlled below 2.5 mg/m³ using SCR denitrification technology, and below 8 mg/m³ using SNCR denitrification technology. The implementation of these standards has forced thermal power plants to implement more effective denitrification measures, leading to the emergence of precision ammonia injection technology.

2、Demand for improved denitrification efficiency

Traditional denitrification ammonia injection systems are designed to automatically control the total amount of ammonia injected. The distribution of ammonia injection relies on periodic adjustments to manual valves in each branch, making it difficult to adapt to changes in NOx concentration distribution at the SCR inlet due to variations in unit load, combustion method, and coal quality. This extensive control approach results in poor uniformity in the ammonia-nitrogen molar ratio, leading to localized or system-wide over- and under-injection of ammonia, which not only affects denitrification efficiency but also increases ammonia slip. Precision ammonia injection technology effectively addresses this issue by enabling full-section monitoring of the NOx/O₂ ratio at the SCR outlet, comprehensively improving ammonia injection control quality.

3、Economic considerations

Ammonia escape not only wastes raw materials and increases business costs, but also clogs and corrodes downstream equipment, shortening equipment life and increasing operation and maintenance costs. Precision ammonia injection technology significantly reduces operating costs and improves economic benefits by reducing ammonia escape.

Suzhou Youyou Environmental Protection focuses on SCR denitrification with "precise ammonia injection, zero ammonia escape" as its core technology. Our denitrification projects are spread across numerous provinces and cities nationwide, earning unanimous recognition and praise from our customers. We prioritize R&D and independent innovation. Our proprietary fully automatic denitrification systems are used in a variety of applications, including boilers, kilns, enameling machines, fuel and gas generator sets, engine rigs, gas turbines, and marine engines. By collecting real-time data on flue gas flow, temperature, NOx concentration, NH3 concentration, and pressure, and achieving precise control through our proprietary metering injection pumps and spray guns, we achieve near-zero NOx and NH3 emissions.