1. Core technology and performance parameters
Thermal efficiency and energy-saving design
Thermal efficiency exceeds 96%: through membrane water-cooled wall, large furnace structure and economizer configuration, the exhaust gas temperature is significantly reduced and the thermal energy utilization rate is improved.
Condensation waste heat recovery: Some models use spiral fin tube condensation economizers to further recover flue gas waste heat, and the thermal efficiency can reach more than 98%.
Low nitrogen combustion technology
NOx emission ≤30mg/m³: Using staged combustion and FGR flue gas recirculation technology, nitrogen oxide emissions are far lower than national standards, meeting the requirements of strict environmental protection areas such as Beijing.
Fully premixed combustion system: fuel and air are fully mixed, combustion is more complete, heat load is uniform, and NOx generation in local high-temperature areas is reduced.
Structural and safety design
Three-pass water-fire tube structure: strengthen radiation and convection heat exchange, extend flue gas process, and improve thermal efficiency.
Full wet back downstream design: corrugated furnace and threaded smoke pipe enhance structural strength, adapt to thermal expansion, and reduce stress concentration risks.
Multiple safety protections: overpressure interlocking protection, water level alarm, automatic sewage discharge, and safety valve linkage to ensure safe operation.
2. Application scenarios and industry adaptation
Industrial heating and steam demand
Chemical industry: Chongqing Changyuan Chemical uses SZS20-1.6-Q low-nitrogen boilers to provide stable steam for permanganate production, meeting the needs of high-end fields such as military industry and medicine.
Building materials industry: wood processing, ceramic production and other scenarios rely on the efficient heating of low-nitrogen boilers to reduce pollutant emissions.
Civil and commercial heating
Large building heating: hospitals, office buildings, residential communities, etc. use 20-ton boilers for centralized heating to reduce operating costs.
Aquaculture and agriculture: greenhouses and livestock farms use boilers to adjust temperatures to promote crop growth and animal health.
Special scenario adaptation
Highland and low temperature environment: The boiler design adapts to high altitude and low pressure conditions to ensure combustion stability.
Distributed energy system: Combined with photovoltaics and energy storage, a low-carbon heating network is built.
3. Operation cost and economic benefit
Fuel consumption and cost
Natural gas consumption: When running at full load, the gas consumption per hour is about 1400m³, calculated at 3.4 yuan/m³, and the fuel cost is about 4760 yuan/hour.
Electricity and water costs: The total power of the water pump and burner is about 52kW, the electricity cost is about 52 yuan/hour; the water cost is about 79.2 yuan/hour (considering 1.1 times the water loss).
Maintenance and labor costs
Low failure rate design: The automated control system reduces manual intervention, and the annual maintenance cost is about 12,000 yuan, equivalent to 33 yuan per hour.
Labor cost: Two-shift boiler operator configuration, labor cost is about 8.3 yuan/hour.
Comprehensive cost and return
Total operating cost: about 4932.5 yuan/hour, annual operating cost is about 4.3 million yuan (calculated at 8000 hours/year).
Investment payback period: Compared with traditional boilers, energy saving is more than 10%, and the equipment upgrade cost can be recovered in 3-5 years.
4. Selection and purchasing suggestions
Technical parameter comparison
WNS series: horizontal three-pass structure, thermal efficiency 91%-95%, suitable for small and medium-sized projects.
SZS series: double drum D-type layout, thermal efficiency above 98%, suitable for large-scale industry and centralized heating.
Supplier selection
Zhengzhou Boiler Factory: WNS14-1.0/95/70-Q model, price about 130,000 yuan/unit, customized service provided.
Yuanda Boiler: CWNS series fully premixed low-nitrogen boiler, supports IoT remote monitoring, thermal efficiency 98%, price range 28,800-598,000 yuan/unit.
Policies and subsidies
Environmental protection subsidies: Some regions provide 30%-50% equipment subsidies for low-nitrogen boiler transformation.
Tax incentives: The purchase of energy-saving equipment can enjoy corporate income tax exemption.
5. Future development trends
Intelligence and digitalization
AI predictive maintenance: through sensors and big data analysis, early warning of equipment failure.
Blockchain energy management: realize transparency of heating data and optimize energy distribution.
Hydrogen energy fusion technology
Hydrogen blending: Some boilers already support 10%-20% hydrogen blending, gradually transitioning to zero-carbon heating.
Pure hydrogen burner research and development: Break through technical bottlenecks such as hydrogen combustion backfire and detonation.
Modular and distributed
Miniaturized design: A single 20-ton boiler can be split into multiple 5-ton modules to flexibly adapt to different load requirements.
Microgrid integration: Collaborate with photovoltaics and energy storage to build a regional low-carbon heating network.
Conclusion
The 20-ton low-nitrogen boiler has become a core equipment in the field of industrial and civil heating with its advantages of high efficiency and energy saving, environmental protection compliance, safety and reliability. In the future, with the breakthrough of intelligent and hydrogen energy fusion technology, its application scenarios will be further expanded to help achieve the "dual carbon" goal.
