SZL series biomass-fired steam boiler is package or shop-assembled water tube boiler with double steam drum and chain grate stoker structure. 4-6 tph boiler is package boiler and 6-35 tph is shop-assembled structure, which is composed of 2 parts, upper part is heat absorbing surface and lower part is combustion equipment. The former part of boiler body is surrounded by membrane wall, its upper part connects with boiler drum and lower part connects with header, which forms a combustion chamber to absorb the radiated heat from furnace; there are dense convection tube bundle between the back side of upper and lower drum, the high temperature smoke enters a separate economizer after flushing heat absorbing surface then discharge from chimney.
The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.
According to different capacity, different numbers of independent air bins are arranged from front to back of the grate.
Graded air supply and special furnace arch structure decrease the NOx emissions to 100mg/m³.
Different biomass raw materials are analyzed by numerical simulations, thermal efficiency is more than 90%.
| Model | Rated thermal power（t/h） | Rated working pressure（MPa） | Steam temperature | Feed water temperature |
| SZL4-1.25-M | 4 | 1.25 | 194 | 20 |
| SZL4-1.60-M | 4 | 1.6 | 204 | 20 |
| SZL4-2.45-M | 4 | 2.45 | 225 | 20 |
| SZL6-1.25-M | 6 | 1.25 | 194 | 20 |
| SZL6-1.60-M | 6 | 1.6 | 204 | 20 |
| SZL6-2.45-M | 6 | 2.45 | 225 | 20 |
| SZL8-1.25-M | 8 | 1.25 | 194 | 20 |
| SZL8-1.60-M | 8 | 1.6 | 204 | 20 |
| SZL8-2.45-M | 8 | 2.45 | 225 | 20 |
| SZL10-1.25-M | 10 | 1.25 | 194 | 20 |
| SZL10-1.60-M | 10 | 1.6 | 204 | 20 |
| SZL10-2.45-M | 10 | 2.45 | 225 | 20 |
| SZL20-1.25-M | 20 | 1.25 | 194 | 20 |
| SZL20-1.60-M | 20 | 1.6 | 204 | 20 |
| SZL20-2.45-M | 20 | 2.45 | 225 | 20 |
| SZL30-1.25-M | 30 | 1.25 | 194 | 20 |
| SZL30-1.60-M | 30 | 1.6 | 204 | 20 |
| SZL30-2.45-M | 30 | 2.45 | 225 | 20 |
| SZL35-1.25-M | 35 | 1.25 | 194 | 20 |
| SZL35-1.60-M | 35 | 1.6 | 204 | 20 |
| SZL35-2.45-M | 35 | 2.45 | 225 | 20 |
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