Biomass Boiler
Boilers
Biomass Boiler
Model: SZL/DZL Series
1. Product Overview
The biomass boiler is an eco-friendly boiler fired with densified biomass fuels such as wood pellets, straw pellets and rice husks. In the SZL/DZL series, fuel burns evenly across a chain grate or reciprocating grate, and the high-temperature flue gas transfers its heat through the water-tube bundles to produce steam or hot water. As a renewable energy source, the CO₂ released during combustion stays within the natural carbon cycle, giving net-zero CO₂ emissions. The series offers wide fuel flexibility, high combustion efficiency, low emissions and low running costs, and is widely used in food processing, chemical, textile, wood processing, district heating and other industries.
Key Features
Rated evaporation 1–40 t/h / Thermal power 0.7–29 MW
Working pressure 0.7–2.5 MPa
Thermal efficiency ≥85%
Biomass pellets/straw/rice husk/wood chips
Zero CO₂ emissions, low-carbon operation
Automatic feeding, unattended operation
Low SO₂ emissions, no desulfurization needed
2. Working Principle
Biomass fuel is fed into the front hopper through an automatic feeding system and evenly conveyed into the combustion chamber via the chain grate. The fuel undergoes four stages on the grate: preheating and drying, devolatilization and ignition, char combustion, and burnout. High-temperature flue gas exits the furnace and passes through convection tube bundles, superheater (if any), economizer, and air preheater, progressively transferring heat to water/steam before being discharged through the chimney after dust removal. The grate speed and air volume are automatically adjusted according to load for optimal combustion conditions.
3. System Classification
1. By structure: Double-drum longitudinal (SZL), Single-drum longitudinal (DZL)
4. Detailed Technical Parameters
4.1 Steam Type Main Parameters
| Parameter | Unit | SZL-1 | SZL-2 | SZL-4 | SZL-6 | SZL-10 | SZL-20 | SZL-40 |
|---|---|---|---|---|---|---|---|---|
| Rated evaporation | t/h | 1 | 2 | 4 | 6 | 10 | 20 | 40 |
| Rated pressure | MPa | 0.7/1.0 | 0.7/1.0/1.25 | 0.7/1.0/1.25/1.6 | 1.0/1.25/1.6 | 1.25/1.6/2.5 | 1.25/1.6/2.5 | 1.6/2.5 |
| Steam temperature | °C | 170/184 | 170/184/194 | 170/184/194/204 | 184/194/204 | 194/204/226 | 194/204/226 | 204/226 |
| Thermal efficiency | % | ≥82 | ≥83 | ≥85 | ≥85 | ≥86 | ≥86 | ≥86 |
| Fuel consumption | kg/h | 220 | 440 | 860 | 1280 | 2100 | 4200 | 8400 |
| Feed water temp. | °C | 20/60 | 20/60 | 20/60/104 | 20/60/104 | 60/104 | 60/104 | 104 |
| Dimensions (L×W×H) | m | 5.5×2.5×3.5 | 6.5×3.0×3.8 | 8.0×3.5×4.2 | 9.5×4.0×4.8 | 11.0×4.5×5.5 | 14.0×5.5×6.5 | 18.0×7.0×8.0 |
| Shipping weight | t | 12 | 18 | 30 | 45 | 65 | 120 | 220 |
5. Core Component Selection
| Component | Material/Spec | Recommended Brand | Remarks |
|---|---|---|---|
| Water wall | 20# steel tube + fin | — | Membrane wall |
| Convection tubes | 20# seamless steel | — | In-line/staggered |
| Chain grate | Cast iron/steel grate bars | — | Wear/heat resistant |
| Feeding system | Screw + belt conveyor | — | Auto metering |
| Forced draft fan | Centrifugal type | — | VFD optional |
| Induced draft fan | Centrifugal + dust collector | — | VFD control |
| Control panel | PLC + touch screen | Siemens | Full auto control |
| Dust collector | Bag/cyclone/wet type | — | Emission compliant |
6. Typical Application Fields
| Industry | Application | Requirement |
|---|---|---|
| Food processing | Cooking, sterilization, drying | Steam 0.3–1.0 MPa |
| Wood processing | Hot pressing, drying kiln | Steam 0.5–1.3 MPa |
| Textile & dyeing | Setting, dyeing, drying | Steam 0.3–0.8 MPa |
| Chemical | Reaction heating, distillation | Steam 0.5–1.6 MPa |
| Central heating | Space heating, hot water | Hot water 95–130°C |
| Paper industry | Cooking, drying | Steam 0.5–1.3 MPa |
7. Design Standards & Certification
GB/T 16507 — Water-tube boiler standard
NB/T 47034 — Industrial boiler technical conditions
TSG 11 — Boiler safety technical regulations
JB/T 10094 — Industrial boiler general technical conditions
ISO 9001 quality management certification
Special equipment manufacturing license
Environmental product certification
8. Customizable Options
| Option | Description | Remarks |
|---|---|---|
| Bag filter | High-efficiency dust removal ≤20mg/Nm³ | Ultra-low emission |
| Denitrification system | SNCR/SCR De-NOx | NOx ≤100mg/Nm³ |
| Economizer | Flue gas heat recovery | Efficiency +3–5% |
| Air preheater | Preheat combustion air | Efficiency +2–3% |
| Multi-fuel system | Biomass + coal dual fuel | Flexible switching |
| Auto ignition | One-key auto ignition | No manual ignition |
| Remote monitoring | IoT cloud platform | Mobile access |
| Waste heat boiler | Flue gas heat recovery for steam | Overall efficiency ≥88% |
9. Warranty Terms
Warranty period: 18 months from shipment or 12 months from commissioning, whichever comes first. Covers material or manufacturing defects. Does not cover consumables (grate bars, refractory bricks, seals) or damage from improper operation, substandard fuel, or non-compliant installation. Service: free replacement of defective parts, free on-site diagnosis, 24/7 phone support, discounted spare parts after warranty.
10. Packaging & Delivery
| Item | Packaging | Transport Dims | Gross Weight |
|---|---|---|---|
| Boiler body | Bulk/modular | Per model | Unit +5% |
| Grate system | Bulk | Per model | Per model |
| Feeding system | Bulk | Per model | Per model |
| Control panel | Wooden crate + moisture barrier | 1.5×1.0×0.8m | ~80kg |
| Fan & dust collector | Bulk | Per model | Per model |
| Accessories | Wooden crate | 1.0×0.8×0.6m | ~50kg |
Lead time: 45–75 working days. Delivery terms: FOB/Shanghai. Documents: Certificate of conformity, operation manual, packing list, pressure vessel certificate.
11. Information Required for Inquiry
| No. | Parameter | Description |
|---|---|---|
| 1 | Rated evaporation/thermal power | t/h or MW |
| 2 | Rated pressure | MPa |
| 3 | Steam/hot water temperature | °C |
| 4 | Biomass fuel type | Pellet/straw/rice husk/chips |
| 5 | Fuel calorific value | kcal/kg |
| 6 | Fuel moisture content | % |
| 7 | Feed water temperature | °C |
| 8 | Steam/hot water application | Process description |
| 9 | Emission requirements | Local environmental standards |
| 10 | Installation environment | Indoor/outdoor |
| 11 | Power supply | V/Hz/phase |
| 12 | Other requirements | Dust collector type, De-NOx, etc. |