Product Overview
The DZL Series Biomass/Coal-Fired Chain-Grate Steam Boiler is designed for reliable, continuous saturated steam supply using solid fuels. Its single-drum chain-grate configuration combines mechanized fuel feeding and ash discharge with zoned under-grate airflow and secondary air injection for stable combustion. Threaded smoke tubes, optimized water-wall heating surfaces, and stress-accommodating structural details support efficient heat transfer and dependable service. Internal flue-gas dust settling also helps reduce the particulate load on downstream emission-control equipment, making the DZL Series a practical choice for industrial plants using locally available coal or biomass.
Product Structure Drawing
Key Advantages
A heavy-duty scale-type chain grate supports continuous, uniform fuel feeding and mechanical ash removal, reducing manual handling and operator workload when paired with automatic auxiliaries.
Front- and rear-arch secondary air injection promotes more complete combustion. Combined with optimized heat transfer, it supports ≥85% thermal efficiency under specified fuel and operating conditions.
Three to five separate under-grate air chambers enable zoned airflow control to match the drying, ignition, combustion, and burnout stages of different solid fuels.
Threaded smoke tubes and optimized water-wall heating surfaces enable rapid heat transfer, supporting rated steam pressure in approximately 30–40 minutes from a warm start under specified conditions.
Curved tube plates and an optimized tube arrangement help accommodate thermal expansion and reduce localized stress, supporting structural durability and a design service life of ≥20 years.
Multi-stage internal flue-gas routing encourages coarse ash particles to settle, reducing the particulate load on downstream dust collectors and supporting effective emission control.
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
| Item / Model | DZL1-0.7-AII DZL1-1.0-AII DZL1-1.25-AII | DZL2-0.7-AII DZL2-1.0-AII DZL2-1.25-AII | DZL4-1.25-AII DZL4-1.6-AII | DZL6-1.25-AII DZL6-1.6-AII | DZL.8-1.25-AII DZL8-1.6-AII | DZL10-1.25-AII DZL10-1.6-AII ( Lower part ) | DZL15-1.6-AII DZL15-2.5-AII ( Lower part ) | DZL20-1.6-AII DZL20-2.5-AII ( Lower part ) | |
| Rated evaporation capacity (t/h) | 1 | 2 | 4 | 6 | 8 | 10 | 15 | 20 | |
| Working pressure(MPa) | 0.7/1.0/1.25 | 0.7/1.0/1.25 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 | 1.6/2.5 | 1.6/2.5 | |
| Rated steam temperature | 170/184/194 | 170/184/194 | 194/204 | 194/204 | 194/204 | 194/204 | 204/226 | 204/226 | |
| Feed water temperature(℃) | 20 | 20 | 20 | 20 | 20 | 70 | 70 | 70 | |
| Heating area( m² ) | Body | ~ 33 | ~ 50 | ~ 100 | ~ 170 | ~ 200 | ~ 250 | 316 | 502 |
| Economizer | 10.56/10.56/20.7 | 27.6 | 52.48/33.12 | 87.2 | 98 | 174 | 351 | 382 | |
| Effective area of grate( m² ) | 2.22 | 2.22 | 4.1 | 5.85 | 7.95 | 9.75 | 11.1 | 23.9 | |
| Fuel type | II class bituminous coal, low leave heat value Q ≈ 21000KJ/Kg | ||||||||
| Fuel consumption ( kg/h) | ~ 151 | ~ 302 | ~ 600 | ~ 880 | ~ 1150 | ~ 1450 | ~ 2200 | ~ 2900 | |
| Exhaust flue gas temperature ( ℃) | 135 ~ 145 | ||||||||
| Thermal efficiency ( % ) | 83 ~ 84 | ||||||||
| Weight of biggest part for transportation ( t ) | 17 | 23 | 25 | 35 | 45 | 33 ( Upside ) 28 ( Underpart ) | 42 ( Upside ) 35 ( Underpart ) | 50 ( Upside ) 28 ( Underpart ) | |
| Overall dimension part for transportation L × W × H ( m ) | 5.1 × 2.2 × 3 | 5.5 × 2.3 × 3.3 | 6.6 × 2.6 × 3.6 | 8.1 × 2.9 × 3.8 | 8.1 × 3.1 × 3.8 | 7.7 × 3.2 × 3.6 8.6 × 3.0 × 2.6 | 10 × 3.24 × 3.54 12 × 3.2 × 3.08 | 11 × 3.24 × 3.54 14 × 3.2 × 3.08 | |
