SZL series biomass-fired hot water boiler is package or shop-assembled water pipe 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 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.
The welding of important parts like the vertical and circular seams of the boiler, the tubes, the inside of boiler and the flange are all adopted automated welding processes such as submerged arc welding or gas shielded welding to ensure the welding quality. All the vertical and circular seams will be done 100% radiographic inspection.
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（MW） | Rated working pressure（MPa） | Rated output water temperature（℃） | Return water temperature（℃） |
| SZL2.8-0.7/95/70-M | 2.8 | 0.7 | 95 | 70 |
| SZL4.2-1.0/115/70-M | 4.2 | 1 | 115 | 70 |
| SZL5.6-1.0/115/70-M | 5.6 | 1.0 | 115 | 70 |
| SZL5.6-1.25/130/70-M | 5.6 | 1.25 | 130 | 70 |
| SZL7.0-1.0/115/70-M | 7 | 1.0 | 115 | 70 |
| SZL7.0-1.25/130/70-M | 7 | 1.25 | 130 | 70 |
| SZL14-1.0/115/70-M | 14 | 1.0 | 115 | 70 |
| SZL14-1.25/130/70-M | 14 | 1.25 | 130 | 70 |
| SZL21-1.0/115/70-M | 21 | 1.0 | 115 | 70 |
| SZL21-1.25/130/70-M | 21 | 1.25 | 130 | 70 |
| SZL29-1.0/115/70-M | 29 | 1.0 | 115 | 70 |
| SZL29-1.25/130/70-M | 29 | 1.25 |
130 |
70 |
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