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The TGR Tsinghua Gas Reburning Ultra-Low NOx Gas-Fired Boiler is a next-generation gas boiler product jointly developed by Taiyuan Boiler Group and the Tsinghua University Low-Carbon Energy Research Institute. Equipped with the proprietary TGR staged combustion and flue gas recirculation burner technology, this TGR gas boiler achieves NOx emissions below 30 mg/Nm3 without requiring selective catalytic reduction, far surpassing China's most stringent national standard with a special emission limit of 50 mg/Nm3. The TGR gas boiler represents the pinnacle of ultra-low NOx combustion technology for industrial and utility gas-fired boiler applications. Each TGR gas boiler unit delivers verified ultra-low NOx performance with low-nitrogen combustion efficiency that sets new benchmarks in the gas boiler industry. The TGR gas boiler is ideal for clean heating, industrial steam, and power applications in environmentally regulated regions.
The TGR Tsinghua Gas Reburning Ultra-Low NOx Gas-Fired Boiler is a next-generation gas boiler product jointly developed by Taiyuan Boiler Group and the Tsinghua University Low-Carbon Energy Research Institute. Equipped with the proprietary TGR staged combustion and flue gas recirculation burner technology, this TGR gas boiler achieves NOx emissions below 30 mg/Nm3 without requiring selective catalytic reduction, far surpassing China's most stringent national standard with a special emission limit of 50 mg/Nm3. The TGR gas boiler represents the pinnacle of ultra-low NOx combustion technology for industrial and utility gas-fired boiler applications. Each TGR gas boiler unit delivers verified ultra-low NOx performance with low-nitrogen combustion efficiency that sets new benchmarks in the gas boiler industry. The TGR gas boiler is ideal for clean heating, industrial steam, and power applications in environmentally regulated regions.
The design philosophy of the TGR gas boiler is to prevent NOx formation at the source rather than relying on downstream catalytic reduction. The TGR gas boiler uses staged fuel injection, controlled flame temperature, and flue gas recirculation to create a low-nitrogen combustion environment that inherently limits thermal and prompt NOx generation. This low-nitrogen combustion approach allows the TGR gas boiler to achieve ultra-low NOx levels while maintaining high thermal efficiency and stable flame characteristics. The TGR gas boiler burner arrangement is designed to produce uniform temperature distribution across the combustion chamber, avoiding hot spots that would otherwise generate local NOx peaks. This design philosophy makes the TGR gas boiler both environmentally superior and economically attractive compared to conventional gas boilers with SCR retrofit.
The TGR gas boiler combustion system operates through three precisely controlled zones. In the first-stage combustion zone, fuel undergoes lean-phase combustion with flame peak temperature controlled below 1400 degrees Celsius, below the threshold for thermal NOx formation. This fundamental temperature control of the TGR gas boiler prevents the majority of thermal NOx from ever forming, establishing the foundation for ultra-low NOx performance. In the second-stage reduction zone, natural gas is injected in a staged manner, where hydrocarbon radicals generated from fuel pyrolysis chemically reduce the NOx that was formed in the first stage back to nitrogen and water. This gas reburning mechanism of the TGR gas boiler provides an additional NOx reduction layer. In the third-stage burnout zone, supplementary air is introduced to ensure complete combustion of any remaining unburned fuel, with CO emissions maintained below 50 ppm. The TGR gas boiler three-zone combustion architecture thus achieves simultaneous ultra-low NOx and low-CO performance through advanced low-nitrogen combustion engineering.
The TGR gas boiler incorporates flue gas recirculation, extracting 10% to 25% of tail-end flue gas and redirecting it to the burner inlet. This FGR system of the TGR gas boiler further reduces the oxygen concentration and flame temperature in the combustion zone, providing an additional NOx suppression mechanism that complements the staged combustion approach. The combination of TGR staged combustion with FGR in the ultra-low NOx gas boiler creates a synergistic NOx reduction effect that achieves the exceptional emission performance of the TGR gas boiler, with measured minimum NOx values reaching as low as 15 mg/Nm3. The low-nitrogen combustion integration ensures that the TGR gas boiler maintains its ultra-low NOx guarantee across the entire operating range, from partial load to full load. The TGR gas boiler FGR system is also designed for rapid response to load changes, supporting dynamic gas boiler operation.
The TGR gas boiler delivers substantial operational benefits beyond its ultra-low NOx performance. The low-nitrogen combustion design allows the TGR gas boiler to avoid the capital cost, catalyst replacement, ammonia consumption, and operational complexity associated with SCR systems. Thermal efficiency of the TGR gas boiler reaches 96% or above, with condensing configurations achieving up to 104% based on lower heating value. The TGR gas boiler also operates with low noise and minimal vibration, improving the working environment in boiler houses. The ultra-low NOx emission profile simplifies permitting and reduces regulatory risk for the gas boiler operator. The TGR gas boiler automated control system manages combustion air, fuel flow, and FGR rate continuously, ensuring the low-nitrogen combustion performance is maintained without manual intervention.
The TGR gas boiler is ideally suited for heating and industrial steam applications in ultra-low emission controlled zones such as Beijing and Xiongan, data center backup boiler systems, hospital and school building heating, and clean steam supply for food and pharmaceutical industries. The TGR gas boiler combination of ultra-low NOx emissions and high thermal efficiency makes it the preferred low-nitrogen combustion solution wherever stringent environmental regulations and energy efficiency requirements converge. Each TGR gas boiler installation delivers compliance with the most demanding air quality standards while providing reliable and efficient steam or hot water supply. The TGR gas boiler is also suitable for cogeneration and distributed energy projects where the gas boiler must meet strict local emission limits.
The TGR gas boiler is manufactured and tested according to the highest standards for gas-fired boilers and low-nitrogen combustion equipment. The TGR gas boiler complies with GB 13271 boiler air pollutant emission standards, GB/T 10180 boiler thermal performance test codes, and relevant safety standards for gas-fired boiler construction. The ultra-low NOx performance of the TGR gas boiler is verified through third-party emission testing under standardized conditions. The low-nitrogen combustion system also meets local special emission limits in key regions where NOx restrictions are most stringent. Certification and documentation for the TGR gas boiler support clients through environmental permitting, energy efficiency audits, and safety inspections. The TGR gas boiler thus provides not only technical leadership but also full regulatory compliance for the gas boiler operator.
Taiyuan Boiler Group Co., Ltd., established in 1958 and headquartered in Taiyuan, Shanxi Province, China, is a nationally designated Class A boiler and environmental protection equipment manufacturing enterprise. The company holds the National Class A Boiler Manufacturing License, D1/D2 Pressure Vessel Design License, A1/A2 Pressure Vessel Manufacturing License, ASME "S" and "U" Code Stamp Authorizations, and has been certified under the ISO 9001 International Quality Management System. In strategic partnership with Tsinghua University, the company co-founded the Low-Carbon Energy Technology Research Institute, and has led the research and development of Circulating Fluidized Bed (CFB) boiler technology for decades, establishing a complete product spectrum ranging from 35 t/h to 1,000 t/h.
Taiyuan Boiler Group, with over 30 years of deep industry engagement and technological accumulation, has obtained the most comprehensive qualification certifications in the boiler manufacturing industry:
√ National Class A Boiler Manufacturing License (Highest Grade)
√ A1, A2 Class Pressure Vessel Manufacturing License
√ D1, D2 Class Pressure Vessel Design License
√ ASME "S" (Power Boiler) and "U" (Pressure Vessel) Code Stamp Authorization
√ ISO 9001 International Quality Management System Certification
Tsinghua University — Taiyuan Boiler Group Low-Carbon Energy Technology Research Institute (Jointly Established)
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