The Air Pollution Prevention and Control Action Plan explicitly requires total pollutant reduction, positioning the “coal-to-gas conversion” initiative as the core strategy for urban coal reduction. Beijing launched citywide low-nitrogen retrofitting of gas-fired boilers in 2016, followed by local standards in Tianjin, Shanghai, Guangdong and other regions that set stricter nitrogen oxide (NOx) emission limits for gas boilers than national standards. As key equipment in the coal-to-gas conversion strategy, gas-fired boilers have demonstrated remarkable effectiveness in reducing sulfur compounds (SO₂) and particulate matter (PM) emissions compared to coal-fired boilers. They achieved over 90% reductions in soot emissions and sulfur dioxide (SO₂) emissions, significantly improving regional air quality. However, the challenge of NOx control has emerged as a new environmental challenge in this process.
This contradiction originates from the inherent characteristics and technical limitations of gas combustion. Natural gas typically burns at temperatures exceeding 1300℃, with localized high-temperature zones reaching over 1500℃ when burner designs are suboptimal or under load fluctuations. Such conditions accelerate thermal NOx formation, causing emission concentrations to frequently surpass the national standard of ≤50mg/m³. This shifting pollution pattern has made NOx control a critical bottleneck for environmental compliance after coal-to-gas conversion. Therefore, achieving low-nitrogen emissions in gas-fired boilers has become both a corporate social responsibility imperative and a strategic necessity to comply with regulatory requirements.
Green Valley Environmental Protection’s independently developed SCR (Selective Catalytic Reduction) denitrification system, featuring proprietary intellectual property and multiple invention patents, demonstrates strong comprehensive competitiveness in ultra-low nitrogen oxide emissions. The SCR system reduces NOx to nitrogen gas (N₂) and water (H₂O) through the combined action of specific temperatures and catalysts, achieving a denitrification efficiency as high as 98%. Its core technological advantages are particularly significant.
The intelligent precision control system achieves compact structural design with advanced features including smart operation, precise spraying, pre-alarm detection, data management, remote monitoring, and real-time transmission. It dynamically adjusts reductant injection based on gas boiler’s real-time operational conditions, ensuring stable emission compliance across varying loads while strictly controlling ammonia slip below 3ppm. This innovation reduces secondary pollution from fugitive ammonia emissions, protecting the environment while lowering subsequent exhaust treatment costs. The system also develops catalysts tailored to different gas boiler operating conditions, effectively treating nitrogen oxides across temperature ranges and expanding the application scope of SCR denitrification systems.
In the field of low-nitrogen co-control for gas-fired boilers, Green Valley Environmental Protection not only provides high-quality products but also ensures comprehensive service systems. Through systematic process flows, modular designs, and customized services, the company delivers one-stop environmental solutions to customers.
Post time: Aug-06-2025