Product Description
AIXBOILER, a leading A-GRADE boiler manufacturer in China with over 45 years of expertise since 1978, offers the SZL series assembled biomass/coal fired boilers. This double-drum longitudinal water tube design with chain grate combustion supports high-capacity steam or hot water production using solid fuels like coal, biomass pellets, wood chips, rice husk, bagasse, straw, and palm shells.
Built in our advanced facility in Taikang Industrial Park, Zhoukou City, Henan Province—the “Hometown of Boilers”—the SZL series features membrane water walls for gas-tight sealing, arched tube sheets for thermal expansion, and convection tube banks for superior heat transfer. Larger capacities require site assembly, ensuring flexibility for industrial-scale operations.
Emphasizing sustainability, AIXBOILER SZL boilers promote biomass utilization for carbon reduction, with advanced dedusting systems for low emissions. Exported to over 80 countries, they serve demanding sectors like power generation, chemicals, food processing, and textiles.
Key Features and Benefits
- High Capacity Design → Double-drum for large steam output and stable circulation.
- Fuel Adaptability → Efficient co-firing of coal and biomass.
- Superior Efficiency → Membrane walls and convection bundles maximize heat absorption.
- Low Emissions → Multi-stage dust removal and desulfurization options.
- Reliable Combustion → Chain grate with variable speed for uniform burning.
- Easy Maintenance → Explosion doors, ash removal, and accessible internals.
Technical Parameters
The table summarizes typical specifications for AIXBOILER SZL biomass/coal fired boilers (steam/hot water; custom available):
| Parameter | Specification Range | Notes / Standard Models |
|---|---|---|
| Rated Steam Capacity | 4 t/h – 40 t/h | Common: 10 – 35 t/h |
| Rated Thermal Power (Hot Water) | 2.8 MW – 29 MW | For large heating systems |
| Rated Working Pressure | 1.0 MPa – 2.5 MPa (10 – 25 bar) | Saturated or superheated steam |
| Steam Temperature | 194°C – 400°C | Superheater optional |
| Thermal Efficiency | 82% – 88% | With economizer/air preheater up to 90% |
| Fuel Type | Coal, Biomass (pellets, chips, husk, straw) | Co-firing capability |
| Boiler Structure | Double Drum Chain Grate Water Tube | Assembled, membrane wall |
| Grate Type | Traveling Chain Grate | Automatic fuel feed and ash discharge |
| Control System | PLC + Touch Screen | Fully automatic with remote monitoring |
| Heating Surface | 200 – 1,000 m² | Convection + radiation |
| Dimensions (approx.) | Varies (e.g., 10m – 20m length) | Site assembly for large units |
| Weight (dry) | 30 tons – 150 tons | Depending on capacity |
| Emissions | Dust ≤ 50 mg/Nm³, NOx/SO2 controlled | With bag filter/cyclone/scrubber |
These parameters deliver robust, fuel-flexible performance for heavy-duty applications.
Additional views of SZL internals, chain grates, and installations:
Design and Construction Standards
AIXBOILER SZL boilers adhere to:
- Primary Standards: GB/T 16507 (China Water Tube Boiler), optional ASME Section I, PED 2014/68/EU
- Materials: High-strength alloy steel tubes and plates
- Welding & Inspection: Automated welding, 100% NDT (RT, UT, MT), hydrostatic testing
- Accessories: Economizer, superheater, air preheater, dust collector, fuel hopper
CFD-optimized for combustion dynamics and minimal stress.
Applications
AIXBOILER SZL biomass/coal fired boilers are ideal for:
- Industrial steam supply (textiles, food, chemicals)
- Power generation and cogeneration plants
- Paper and plywood production
- Large-scale district heating
- Biomass renewable energy projects
- Areas with abundant agricultural/wood waste
They enable efficient utilization of local solid fuels.
Quality Assurance and Testing
Every boiler undergoes:
- Rigorous hydrostatic and combustion trials
- Emission and efficiency verification
- Full NDT and third-party certification (TUV, SGS, BV available)
- Factory pre-assembly and client FAT
Guaranteeing safe, high-performance delivery.
Why Choose AIXBOILER?
With family heritage since 1978, government designation in 2025, and a team of over 60 senior engineers, AIXBOILER excels in large-scale SZL solutions. We provide end-to-end services: fuel consultation, custom engineering, manufacturing, installation supervision, and 24/7 maintenance for sustainable, high-capacity heating worldwide.
The SZL Biomass/Coal Fired Boiler, manufactured by AIX Boiler, a Chinese A-grade producer since 1976, is a water-tube boiler designed for efficient combustion of biomass or coal to produce steam or hot water for industrial applications. Featuring a double-drum design and chain grate, it achieves high thermal efficiency (up to 88%) while reducing fuel costs. Its robust structure ensures durability, and advanced controls simplify operation and maintenance. With low emissions and adaptability to various fuels, it meets environmental standards, making it ideal for industries like textiles, food processing, and power generation. AIX SZL boilers deliver reliable, eco-friendly heating solutions.
Steam Boiler
| Model | Rated Steam
Capacity (t/h) |
Rated Steam
Pressure (MPa) |
Rated Steam
Temperature (℃) |
Coal Consumption
(Kg/h) |
Thermal Efficiency
(%) |
Overall Dimension
L*W*H（m） |
Weight
(t) |
||
| DZL2-0.7/1.0/1.25- AII/T | 2 | 0.7/1.0/1.25 | 170/184/194 | 135 | 82 | 5.5×2.3×3.3 | 23 | ||
| DZL6-1.25/1.6- AII/T | 6 | 1.25/1.6 | 194/204 | 810 | 82 | 7.5×2.9×3.8 | 35 | ||
| DZL8-1.25/1.6- AII/T | 8 | 1.25/1.6 | 194/204 | 1150 | 82 | 8.1×3.1×3.8 | 45 | ||
| DZL10-1.25/1.6- AII/T | 10 | 1.25/1.6 | 194/204 | 1350 | 82 | Up 7.7×3.2×3.6 | Down 8.6×3×2.6 | 61 | |
| DZL15-1.6/2.5- AII/T | 15 | 1.6/2.5 | 204/226 | 2200 | 83 | Up 1.0×3.24×3.54 | Down 12×3.2×3.08 | 77 | |
| DZL20-1.25/1.6- AII/T | 20 | 1.6/2.5 | 204/226 | 3160 | 83 | Up 11×3.24×3.54 | Down 14×3.2×3.08 | 78 | |
| Note: 1. Parameter is for reference only, if any changes should follow the factory technical data.
2. Available fuel: coal, lower heating value: Q≈21,000 KJ/Kg |
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Hot water boiler
| Model | Rated power
(MW) |
Rated pressure
(Mpa) |
Supply water
temperature(℃) |
Return water temperature
(℃) |
Fuel consumption
(kg/h) |
Thermal Efficiency
(%) |
Overall Dimension
L*W*H（m） |
Weight
(t) |
| DZL0.7-0.7/95/70 | 0.7 | 1.0 | 95 | 70 | 151 | 82 | 5.1×2.2×3 | 17 |
| DZL1.4-0.7/95/70 | 1.4 | 1.0 | 95 | 70 | 302 | 82 | 5.5×2.3×3.3 | 23 |
| DZL2.8-0.7/95/70 | 2.8 | 1.0 | 95 | 70 | 600 | 82 | 6.6×2.6×3.6 | 25 |
| DZL4.2-1.0/95/70 | 4.2 | 0.7 | 95 | 70 | 880 | 82 | 7.5×2.9×3.8 | 35 |
| DZL5.6-1.25/95/70 | 5.6 | 0.7 | 95 | 70 | 1150 | 82 | 8.1×3.1×3.8 | 45 |
| Note: 1. Parameter is for reference only, if any changes should follow the factory technical data.
2. Available fuel: coal, lower heating value: Q≈21,000 KJ/Kg |
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- Ho
Features
SZL series double drums boiler is horizontal type large capacity water tube boiler with high steam quality. Compare with the previous boiler, the new type SZL boiler adopts membrane water cooling wall, low thermal inertia design, and water cooling combustion chamber. Boiler with steam capacity lower than 4t/h is fast assembly water tube structure, the boiler with steam capacity between 6~25t/h is consisted of upper part (boiler heating part) and lower part (combustion equipment). This series boiler has reached the international advanced level on technology and performance, has the advantages of compact structure, convenient installation, short install period, low cost, and environmental protect.
●High Quality: In manufacturing processes, we has adopting steel strength test, automatic steel cutting/ plate rolling/ welding, 100% x-ray welding check, magnetic particle check c-scan ultrasonography check, fluorescent penetrating check, hydraulic (water) pressure test, boiler thermal efficiency test,etc, to make sure all finished products is qualified.
●Automatic Operation: Traveling chain grate can feed the fuel automatically, ash remover can clean the ash automatically.
●Automatic Control: SZL series is equipped with automatic water-level control, automatic pressure control, automatic interlock chain stop protection, free settable working pressure, visible system’s working states on screen.
●Wide Adaptability on Fuels: SZL can fire coal, rice husk, nut shell, sawdust, wood chips, wood pellet, biomass pellet, etc.