OF
SEFAKO provides fluidized bed steam boilers, where combustion of the fuel occurs on a stationary (or bubbling) fluidized bed. The boiler is a two-pass membrane wall system on a self-supporting structure. To separate out the large ash particles, the exhaust of the furnace chamber features a louvre separator, where the fly ash is returned to the fluidized bed.
The air distribution must be uniform across the combustion volume, and this is ensured by the optimised design of the air grate. It has a system of air nozzles of various designs that feed the right flow of combustion and fluidization air, while preventing gas backflow, which would otherwise blow loose material back into the air box.
The boiler unit comes complete with boiler house systems and devices for correct operating control and monitoring, and environmental protection compliance.
Table 1: Example of the OF boiler type series
|
|
OF-15 |
OF-20 |
OF-35 |
|
Design heat effect, MW |
12 |
15 |
28 |
|
Boiler water inlet temp., °C |
105 |
105 |
115 |
|
Boiler steam outlet temp., °C |
400 |
400 |
485 |
|
Boiler water outlet pressure, MPa |
4.0 |
4.0 |
6 |
|
Design water flow rate across the boiler (105/400°C), t/h |
15.0 |
19.5 |
34.8 |
|
Boiler flue gas exhaust temp., °C |
145 |
145 |
140 |
|
Gross design efficiency (*), % |
89.0 |
89.0 |
89.1 |
|
Fuel consumption (*), kg/h |
2625 |
3280 |
6116 |
* At the design rating and when using guarantee-compliant fuel (hard coal, 17,500 kJ/kg)
The parameters of the boiler
| Name | Value |
|---|---|
| Fuel | Carbon |
| Construction | Water tube |
| Combustion | Fluids |
| Energy | Steam |