Product Overview
The DZL Series Industrial Biomass/Coal-Fired Chain-Grate Hot Water Boiler is designed for industrial heating and centralized hot-water supply. Featuring a compact longitudinal structure, a mechanized chain grate, and optimized heat-transfer surfaces, it supports continuous fuel feeding, stable combustion, and efficient heat utilization. Its optimized water circulation system helps prevent localized overheating, while threaded smoke tubes improve convective heat transfer and integrated gravity dust separation reduces the particulate load on downstream dust collectors. Designed for coal and a range of biomass fuels, the boiler offers dependable heating performance, simplified maintenance, and reduced installation space for long-term industrial operation.
Product Structure Drawing
Key Advantages
A specialized return-water ejector increases water velocity inside the riser tubes, helping prevent subcooled boiling and maintain natural circulation during power interruptions.
An arched tube-plate design and single-pass tube layout reduce localized thermal stress by up to 50%, helping minimize the risk of tube-plate cracking.
Optimized riser-tube arrangement reduces stagnant water zones at the bottom of the drum, improving local cooling and operational reliability.
Threaded smoke tubes increase flue-gas turbulence and can improve convective heat transfer by 30–40%, while helping reduce internal ash accumulation.
Internal refractory walls and optimized flue-gas outlets promote the settling of larger fly-ash particles, potentially reducing the dust load on downstream filtration equipment.
The longitudinal boiler layout and protective casing reduce the required installation footprint by over 30% compared with equivalent traditional models, helping lower infrastructure costs.
Typical Applications
Cooking、Pasteurization、Sterilization、Cleaning、Evaporation、Drying
Dyeing、Bleaching、Washing、Sizing、Printing、Drying、Finishing
Reactor Heating、Distillation、 Evaporation、Drying、Stripping、Tank Heating 、Cleaning
Pulp Cooking、Evaporation、Paper Drying、Starch Preparation、Coating、Tank Heating、Cleaning
Rubber Vulcanization、Compounding、Mold Heating、Process Water Heating、Equipment Cleaning、Drying
Space Heating、Domestic Hot Water、Campus Heating、Public Building Heating、Industrial Heat Supply、Peak-Load Support
Technical Specifications
| Model / Item | DZL0.7- 0.7/95/70-All DZL0.7- 1.0/95/70-All | DZL1.4- 0.7/95/70-All DZL1.4- 1.0/95/70-All | DZL2.8- 0.7/95/70-All DZL2.8- 1.0/95/70-All | DZL4.2- 1.0/95/70-All | DZL5.6- 1.0/95/70-All DZL5.6- 1.25/95/70-All | DZL7-1.0/95/70- All DZL7-1.25/95/70- All ( upside undopart ) | |
| Rated thermal power(MW) | 0.7 | 1.4 | 2.8 | 4.2 | 5.6 | 7 | |
| Rated supply water pressure (MPa) | 0.7/1.0 | 0.7/1.0 | 0.7/1.0 | 0.7/1.0 | 1.0/1.25 | 1.0/1.25 | |
| Rated supply water temperature (°C) | 95 | 95 | 95 | 95 | 95 | 95 | |
| Rated Return water temperature (°C ) | 70 | 70 | 70 | 70 | 70 | 70 | |
| Heating area(m² ) | body | ~33 | ~50 | ~100 | ~170 | ~200 | ~250 |
| Economizer | 10 | 30 | 55 | 86 | 98 | 174 | |
| Effective area of grate(m² ) | 2.22 | 4.1 | 5.85 | 7.95 | 9.75 | 10.77 | |
| Fuel type | II class bituminous coal, low leave heat value Q ≈ 21000KJ/Kg | II class bituminous coal, low leave heat value Q ≈ 21000KJ/Kg | |||||
| Fuel consumption ( kg/h ) | ~ 151 | ~ 302 | ~ 600 | ~ 880 | ~ 1150 | ~ 1450 | |
| Exhaust gas temperature ( °C ) | 135 ~ 145 | ||||||
| Thermal efficiency ( % ) | 83 ~ 84 | ||||||
| Weight of biggest part for transportation ( t ) | 17 | 23 | 25 | 35 | 45 | 33 ( upside ) 28 ( undopart ) | |
| Overall dimension part for transportation L × W × H ( mm ) | 5.1 × 2.2 × 3 | 5.5 × 2.3 × 3.3 | 6.6 × 2.6 × 3.6 | 7.5 × 2.9 × 3.8 | 8.1 × 3.1 × 3.8 | 7.7 × 3.2 × 3.6 8.6 × 3.0 × 2.6 | |
