Research Article
Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite
Table 4
Deposit sampling using probes.
(a) Foul probe test conditions—position windward |
| Test serial number | Gas temp. °C | Probe temp. °C | Exposure hours | Limestone tonnes/hr | SO2 ppm | Rate of buildup g/m2 hr | Lignite fired during test Giral sample numbers (Table 1) |
| 1 | 685 | 500 | 0.5 | 0 | >5000 | 62 | Sample number 2 | 2 | 635 | 500 | 0.5 | 0 | >5000 | 34 | Sample number 3 | 3 | 720 | 600 | 0.5 | 0 | >5000 | 73 | Sample number 2 | 4 | 680 | 500 | 2 | 5 | 1800 | 39 | Sample number 3 | 5 | 690 | 500 | 0.5 | 8 | 1800 | 27 | Sample number 4 | 6 | 700 | 500 | 2 | 12 | 1200 | 61 | Sample number 2 |
|
|
(b) Chemical composition of foul probe deposit samples |
| Serial number | Na2O | MgO | Al2O3 | SiO2 | SO3 | K2O | CaO | TiO2 | MnO | Fe2O3 |
| 1 | 3.3 | 3.5 | 12.2 | 20.5 | 18 | 0.3 | 11.2 | 2.3 | 0.1 | 28.6 | 2 | 3.2 | 2.3 | 16.2 | 29.9 | 8.0 | 0.4 | 4.6 | 1.5 | 0.2 | 33.7 | 3 | 4.5 | 3.8 | 15.9 | 25.2 | 15.0 | 0.4 | 9.3 | 2.1 | 0.2 | 23.7 | 4 | 0.7 | 1.1 | 5.1 | 7.7 | 36.8 | 0.0 | 38.4 | 0.7 | 0.0 | 9.5 | 5 | 0.8 | 0.9 | 4.1 | 6.5 | 39.6 | 0.0 | 39.0 | 0.5 | 0.0 | 8.6 | 6 | 0.7 | 0.9 | 4.8 | 7.3 | 37.8 | 0.1 | 39.9 | 0.6 | 0.0 | 7.9 |
|
|