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, sterilization, drying, and general process steam
Dyeing, washing, fabric finishing, and drying
Pulp processing, paper drying, and plant utility steam
Wood drying, veneer conditioning, and hot-press heating
Grain processing, feed conditioning, and crop-residue utilization
Reactor heating, batch processing, and utility steam
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 | |
